To calculate the minimum force required to open a jar using a jar wrench, we need to consider the torque required to overcome the friction between the lid and the jar.
The torque required to open a jar can be calculated using the formula:
Torque = Force x Distance
where Force is the minimum force required to open the jar, and Distance is the distance between the center of the jar and the point where the force is applied (in this case, the distance between the center of the jar and the end of the jar wrench handle, which is 19 cm).
The minimum force required to open the jar can be calculated by dividing the torque required by the radius of the lid.
Let's assume that the radius of the lid is 4 cm.
So, the minimum force required to open the jar is:
Force = Torque / Radius of the lid
To calculate the torque required, we need to estimate the force of friction between the lid and the jar. Let's assume that the force of friction is 0.2 times the weight of the jar, which is the typical range for a well-sealed jar.
So, the torque required to open the jar is:
Torque = Force of friction x Distance
Torque = 0.2 x Weight of the jar x Distance
Let's assume that the weight of the jar is 500 grams, which is equivalent to 4.9 N (Newtons), and the distance between the center of the jar and the end of the jar wrench handle is 19 cm.
So, the torque required to open the jar is:
Torque = 0.2 x 4.9 N x 19 cm
Torque = 1.86 N-cm
Now we can calculate the minimum force required to open the jar:
Force = Torque / Radius of the lid
Force = 1.86 N-cm / 4 cm
Force = 0.47 N
Therefore, the minimum force required to open the jar using a jar wrench with a handle that extends 19 cm from the center of the jar is approximately 0.47 N.
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10. A roller coaster accelerates at 8.75 m/s² from rest to a final velocity of 70 m/s. How long does it
take to speed up?
A roller coaster accelerates at 8.75 m/s² from rest to a final velocity of 70 m/s it takes 8 sec to speed up.
How to calculate time?Using the equation v = u + at, we can find:70 m/s for final velocityThe roller coaster starts at rest, therefore u = starting velocity = 0 m/s.8.75 m/s2 for acceleration and time, respectivelyWhen we solve for t, we obtain:t = (v - u) / at = (70 m/s - 0 m/s) / 8.75 m/s2 t = 8 sec.In light of this, the roller coaster's acceleration takes 8 seconds.The rate of change in an object's velocity with respect to time is known as acceleration in mechanics. The vector quantity of accelerations. The direction of the net force that is acting on an object determines its acceleration.For more information on time of roller coaster kindly visit to
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the buoyant force on a one-ton blimp hovering in air is group of answer choices more than one ton. one ton. less than one ton. zero.
Resulting in a buoyant force that is less than the weight of the blimp. This is what allows the blimp to float and hover in the air.
The buoyant force on a one-ton blimp hovering in air is actually less than one ton. This is because the buoyant force is the upward force exerted by a fluid (in this case, air) on an object immersed in it.
The force is equal to the weight of the fluid displaced by the object.Therefore, the buoyant force on the blimp is equal to the weight of the air that the blimp displaces. As the blimp is less dense than air, it displaces a volume of air that weighs less than one ton,
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The Code generally requires receptacles installed in an unfinished basement to be GFCI protected. The exception(s) to the general rule includes a single receptacle installed to serve a permanently installed alarm system (true or false)
The given statement, The Code generally requires receptacles installed in an unfinished basement to be GFCI protected. The exception(s) to the general rule includes a single receptacle installed to serve a permanently installed alarm system, is true because unfinished basements are considered to be damp and potentially hazardous environments.
The National Electrical Code (NEC) generally requires that all receptacles installed in unfinished basements be protected by ground-fault circuit interrupters (GFCIs) to prevent electrical shock hazards. However, there are some exceptions to this rule.
One of the exceptions is for a single receptacle that is installed to serve a permanently installed alarm system in the unfinished basement. Such a receptacle does not need to be GFCI protected, as long as it is designated as a dedicated branch circuit for the alarm system and meets other applicable code requirements.
It's worth noting that local electrical codes may have additional requirements or exceptions, so it's always a good idea to consult with a licensed electrician or local code authority for specific information related to your installation.
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an automobile travels 540 km in 4 hr and 30 mins. what is the average velocity over the entire 4.5 hr interval
The average velocity of the automobile over the entire 4.5-hour interval is 120 km/h.
Explanation: To find the average velocity, we divide the total distance traveled by the total time taken.
In this case, the automobile travels 540 km in 4 hours and 30 minutes. We can convert 30 minutes to 0.5 hours, then add it to 4 hours to get a total time of 4.5 hours.
Average velocity = Total distance ÷ Total time
= 540 km ÷ 4.5 hours
= 120 km/h
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if the film is 1 meters from the (point) source, how big is the spot size at the film in centimeters?
The spot size at the film will depend on the size of the source and the distance between the source and the film. Without knowing the size of the source, we cannot accurately determine the spot size. However, we can use the concept of geometric optics to make a rough estimate.
If we assume that the source is a point source and that the light from the source is diverging uniformly in all directions, then we can use the thin lens equation to estimate the spot size at the film. The thin lens equation is given by:
1/f = 1/di + 1/do
where f is the focal length of the lens, di is the distance from the lens to the image plane (the film), and do is the distance from the lens to the object (the source).
If we assume that the film is the image plane and that the source is at infinity, then do is effectively infinite, and we can simplify the equation to:
1/f = 1/di
Solving for di, we get:
di = f
Therefore, the distance from the lens to the film should be equal to the focal length of the lens.
If we assume that the size of the source is small compared to the distance between the source and the film, then the spot size at the film can be approximated by the formula:
spot size = (source size) x (distance between source and film) / (distance between source and lens)
Without knowing the size of the source, we cannot determine the spot size accurately, but this formula can provide a rough estimate.
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Imagine Canada made moves to enter the space age and built its own rockets. What is the governing body that they would have to petition to determine if a mission qualifies as an official spaceflight?
A. NASA
B. Aerospace Manifest
C. Laws of Airspace Travel
D. Fédération Aéronautique Internationale or FAI
*Answer is D*
If Canada were to build its own rockets and launch them into space, it would need to adhere to international standards and regulations set by the Fédération Aéronautique Internationale or FAI.
The FAI is a governing body that oversees international aviation and spaceflight activities, and its mission is to promote safe and responsible practices in air and space travel. The FAI maintains records of achievements in air and space activities and coordinates with national and international organizations to ensure compliance with regulations and guidelines.
In order for a mission to qualify as an official spaceflight, the FAI would need to be petitioned and the mission would need to adhere to its standards and regulations. These regulations include safety measures, technical specifications, and environmental impact assessments, among others.
By adhering to these regulations, Canada could ensure safe and responsible spaceflight activities and contribute to the development of the international space community and NASA.
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thinking back to chapter 8, a tidal wave is which wave type?
A tidal wave is a type of wave known as a "tidal bore," also called a "seiche."
Tidal bores occur when the rising tide creates a wall of water that moves up a river or narrow bay against the direction of the river or bay's flow.
This occurs due to the gravitational forces of the Moon and Sun, which cause the ocean's water level to rise and fall in a regular cycle of tides.
As the high tide crests at the mouth of the river or bay, a surge of water propagates upstream and collides with the lower water level.
The interaction between the two bodies of water generates a large, powerful wave that moves upstream.
The height and speed of the tidal bore depend on the shape and depth of the river or bay, as well as the astronomical tide cycle.
Tidal waves can be dangerous, as they can cause damage to boats, structures, and ecosystems along the river or bay.
Some tidal bores can reach heights of up to several meters and travel at speeds of up to 30 km/h (18.6 mph), creating dangerous conditions for those caught in their path.
Despite their destructive potential, tidal bores can also be an attraction for surfers and thrill-seekers who ride the waves on specialized boards or boats.
Tidal bore surfing has become a popular sport in some parts of the world, such as the Qiantang River in China and the Amazon River in Brazil.
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A computer hard disk starts from rest, then speeds up with
an angular acceleration of 190 rad/s until it reaches its final
angular speed of 7200 rpm. How many revolutions has the disk
made 10. 0s after it starts up?
The final angular speed of the hard disk is 766.9 rad/s, and it takes 4.04 s to reach this speed with an angular acceleration of 190.0 [tex]rad/s^2[/tex].
To take care of this issue, we want to utilize the equation that relates the rakish removal of a pivoting object to its precise speed increase, time, and beginning rakish speed. The equation is given by:
θ = 1/2 * α * [tex]t^2[/tex] + ω0 * t + θ0
Where θ is the complete point pivoted by the plate, α is the precise speed increase, t is the time slipped by, ω0 is the underlying rakish speed, and θ0 is the underlying point.In this issue, the circle begins from rest, so ω0 = 0. The rakish speed increase of the plate is given as 190 [tex]rad/s^2[/tex], and the last precise speed is 7200 rpm.
We want to change the last precise speed from rpm over completely to rad/s by increasing it with 2π/60. In this manner, the last precise speed is 240π rad/s.We can now substitute these qualities into the recipe and compute the absolute point pivoted by the circle after 10.0 seconds:
θ = 1/2 * 190 [tex]rad/s^2[/tex] * [tex](10.0 s)^2[/tex] + 0 rad/s * 10.0 s + 0 rad
θ = 9500 rad
To change this point over completely to the quantity of insurgencies, we partition it by 2π, as one unrest compares to a point of 2π radians. Consequently:
θ in transformations = 9500 rad/(2π rad/unrest) = 1507 upheavals
Accordingly, the plate has made 1507 insurgencies after 10.0 seconds from its underlying state.
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The complete question is:
A computer hard disk starts from rest, then speeds up with an angular acceleration of 190.0 [tex]rad/s^{2}[/tex]until it reaches a final angular speed of 7300.0 rpm.
(a) What is the final angular speed in units of rad/s? rad/s.
(b) How long does it take for the disk to reach this angular speed? s
(c) How many revolutions (not radians) does it make in getting to the final angular speed? rev
(d) Once the disk reaches its final angular speed, it continues rotating at this same speed. How many revolutions has the disk made 10.0 s after it started up from rest?
solid forms of ice last longer because there is more weight with less surface area. (True or False)
The solid forms of ice last longer because there is more weight with less surface area. This statement is false.
Factors like temperature, shape, size, humidity and impurities are some of the factor decides the time for which the ice survives. Even though larger ice particles may have more surface area than solid forms of ice, this does not always imply that they will persist longer.
In reality, due to the insulating effect of the ice itself, larger ice formations, like glaciers, can melt more quickly. In the end, a complex combination of physical, chemical, and environmental elements determines how long ice will last.
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a wheel of radius 15 cm has sa rotational inertia of 2.3 kg m^2. the wheel is spinning at a rate of 6.5 revolutions per second. a frictional force is applied tangentially to the wheel to bring it to a stop. the work done by the torque to stop the wheel is most nearly:
The work done by the torque to stop the wheel is -1918 J.
The given parameters are:
- Wheel radius (r): 15 cm = 0.15 m
- Rotational inertia (I): 2.3 kg·[tex]m^{2}[/tex]
- Angular velocity (ω): 6.5 revolutions per second = 6.5 * 2π rad/s ≈ 40.84 rad/s
To find the work done by the torque to stop the wheel, we can use the rotational work-energy theorem: W = 0.5 * I * (ω_[tex]f^{2}[/tex] - ω_[tex]i^{2}[/tex]), where W is the work done, ω_f is the final angular velocity (0 rad/s), and ω_i is the initial angular velocity.
Plugging in the given values:
W = 0.5 * 2.3 kg·[tex]m^{2}[/tex] * (0^2 - 40.84 rad/s^2)
W = 0.5 * 2.3 kg·[tex]m^{2}[/tex] * (-1667.86 rad^2/s^2)
W ≈ -1918.24 J
Since work is done against the frictional force to bring the wheel to a stop, the work done is negative. Therefore, the work done by the torque to stop the wheel is most nearly -1918 J.
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a smooth impression tray is coated with a(n) ____________ before the final impression material is placed in the tray.
A smooth impression tray is coated with a separating medium before the final impression material is placed in the tray.
In dentistry, an impression tray is used to take an impression of a patient's teeth and oral tissues, which is then used to create a custom dental restoration. Before placing the final impression material in the tray, a separating medium is applied to the tray's surface. This is typically a thin layer of material that acts as a barrier between the impression material and the tray to prevent the impression from sticking to the tray when it is removed from the mouth.
The separating medium may be a liquid or a paste, and it should be applied evenly and thinly to ensure an accurate impression. Without a separating medium, the impression material may distort or tear when the tray is removed, resulting in an inaccurate impression.
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as a parcel of air is swept upward with no heat input or output its temperature
As a parcel of air is swept upward with no heat input or output, its temperature changes due to a process known as adiabatic cooling or warming.
Adiabatic cooling occurs when a parcel of air rises and expands due to a decrease in atmospheric pressure, causing it to lose internal energy and cool down. This is because the work done by the parcel in expanding requires energy, which it obtains from its own internal energy, causing a decrease in temperature.
Similarly, adiabatic warming occurs when a parcel of air is compressed due to an increase in atmospheric pressure as it sinks towards the surface. This causes the parcel to gain internal energy and warm up, as the work done on the parcel in compression adds energy to its internal energy, resulting in an increase in temperature.
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a race car driver is driving his car at a constant speed of 53.5 m/s on a circular track with a radius of 200 m. what are the magnitude (in m/s2) and direction of the car's acceleration?
The magnitude of the car's acceleration is 14.31 m/s². The direction of the car's acceleration is towards the center of the circular track.
To find the magnitude and direction of the car's acceleration, we'll use the centripetal acceleration formula and the fact that it acts toward the center of the circle.
1. Calculate centripetal acceleration:
Centripetal acceleration (a_c) = v² / r
Where v is the constant speed (53.5 m/s) and r is the radius of the circular track (200 m).
2. Plug in the values:
a_c = (53.5 m/s)² / 200 m
3. Solve for a_c:
a_c = 2862.25 m²/s² / 200 m
a_c = 14.31 m/s²
The magnitude of the car's acceleration is 14.31 m/s².
As for the direction of the acceleration, centripetal acceleration always acts towards the center of the circular path. So, in this case, the direction of the car's acceleration is towards the center of the circular track.
In summary, the magnitude of the car's acceleration is 14.31 m/s², and the direction is towards the center of the circular track.
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electricity and magnesium are related because they influence each other. true or false?
we pass a laser beam through a double slit. on a screen 11.36 m away, we observe a series of bright lines which are 3.4 mm apart. the wavelength of the laser light is 633 nm. what is the distance between the two slits?
The distance between the two slits is 2067.6 mm. This can be calculated using the equation d=λxD/y, where λ is the wavelength of the laser light, D is the distance between the slits and the screen, and y is the distance between the bright lines on the screen.
Substituting the given values in the equation, we get
d = (633 x 11.36) / 3.4
d = 2067.6 mm
Therefore, the distance between the two slits is 2067.6 mm.
To understand the equation, we must consider the phenomenon of interference. When a wavelength of light passes through two slits, it creates two waves that interfere with each other. The bright lines on the screen occur when the two waves are in phase, and the dark lines occur when the waves are out of phase.
The distance between the bright lines on the screen is equal to one wavelength of the laser light multiplied by the ratio between the distance between the two slits and the distance between the two slits and the screen.
Complete Question:
We pass a laser beam through a double slit. On a screen 11.36 m away, we observe a series of bright lines which are 3.4 mm apart. The wavelength of the laser light is 633 nm. What is the distance between the two slits?
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when does a star become a main-sequence star? when the rate of hydrogen fusion within the star's core is high enough to maintain gravitational equilibrium when hydrogen fusion is occurring throughout a star's interior when the protostar assembles from a molecular cloud when a star becomes luminous enough to emit thermal radiation the instant when hydrogen fusion first begins in the star's core
Answer: hope it helps
Explanation:
A protostar becomes a main sequence star when its core temperature exceeds 10 million K. This is the temperature needed for hydrogen fusion to operate efficiently.
What specific evidence does Norton offer for her
belief?
4. when uv light of wavelength 255 nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.40 ev. what is the work function of the metal?
The metal has a work function of -4.00 x 10^-19 J.
Determine the work function of a metal.The work function of the metal can be calculated using the equation:
work function = (Planck's constant x speed of light) / (wavelength of incident radiation) - (maximum kinetic energy of emitted electrons / electron charge)
Substituting the given values, we get:
[tex]work function = ((6.626 x 10^-34 J s) x (2.998 x 10^8 m/s)) / (255 x 10^-9 m) - (1.40 eV / 1.602 x 10^-19 C)[/tex]
Simplifying, we get:
[tex]work function = 4.73 x 10^-19 J - 8.73 x 10^-19 J[/tex]
Therefore, the work function of the metal is [tex]-4.00 x 10^-19 J.\\[/tex]
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A wagon of mass 2.4 kg is pushed along the ground at 1.2 m/s2 (E) against a frictional force of 1.22 N [W]. What is the applied force that is acting? Draw a free-body diagram; create a net force equation and determine Fa.
The applied force acting on the wagon is 3.04 N.
What is the direction of the applied force?The direction of the applied force is east.
What is the net force acting on the wagon?The net force acting on the wagon is Fa - Ff, which is equal to (2.4 kg)(1.2 m/s^2) + 1.22 N, or 3.04 N.
To determine the applied force, we need to use the equation for net force: ΣF = ma
where ΣF is the sum of all forces acting on the wagon, m is the mass of the wagon, and a is the acceleration of the wagon.
From the free-body diagram, we can see that the forces acting on the wagon are the applied force (Fa) in the direction of motion (east), and the frictional force (Ff) in the opposite direction (west):
So the net force equation becomes:
Fa - Ff = ma
Substituting the given values, we get:
Fa - 1.22 N = (2.4 kg)(1.2 m/s^2)
Simplifying and solving for Fa, we get:
Fa = (2.4 kg)(1.2 m/s^2) + 1.22 N
Fa = 3.04 N
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HELP PLEASE Light travels to Earth from space as a/an_________wave.
O Mechanical
OSound
O Electromagnetic
O Longitudinal
Answer:
electromagnetic wave.
Explanation:
You can see light from the moon, distant stars, and galaxies because light is an electromagnetic wave. Electromagnetic waves are waves that can travel through matter or through empty space.
Answer: C) Electromagnetic wave
Explanation: It can't be D) Longitudinal because there is no such thing as a longitudinal wave that has to do with space. It wouldn't be mechanical cuz a mechanical doesn't have anything to do with light, neither sound.
Thus, the answer is C) Electromagnetic
the james webb space telescope is scheduled to launch in 2018. in what range of the electromagnetic spectrum will it operate?
The James Webb Space Telescope is designed to operate primarily in the infrared portion of the electromagnetic spectrum, with a wavelength range of 0.6 to 28 microns.
What is the James Webb Space TelescopeThe James Webb Space Telescope (JWST) is a large, infrared-optimized space telescope that was originally scheduled to launch in 2018, but has since been delayed multiple times.
The range for JWST is a much wider range than the Hubble Space Telescope, which operates mainly in the visible and ultraviolet parts of the spectrum. By studying the infrared light emitted by stars and galaxies, the JWST will be able to observe objects that are too faint or too distant to be seen by other telescopes, and will provide new insights into the early universe, the formation of galaxies, and the formation of stars and planetary systems.
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For every word define it, write a sentence about how you see it in everyday life, use word in sentence.
Words: Mechanical Wave, Transverse Wave, Longitudinal Wave, Wave Speed Wavelength, Frequency Crest, Trough Amplitude, Compression Rarefaction
A mechanical wave is a wave that requires a medium to travel through, such as sound waves or water waves. In everyday life, we experience mechanical waves when we hear sounds or see water waves in a pond.
What are Transverse Wave, Longitudinal Wave, wavelength, speed, frequency and amplitude?Transverse Wave: A transverse wave is a wave that vibrates perpendicular to the direction of wave propagation, such as light waves or radio waves.
We use transverse waves every day when we use our phones to receive radio waves.
Longitudinal Wave: A longitudinal wave is a wave that vibrates parallel to the direction of wave propagation, such as sound waves or seismic waves.
We hear sound through longitudinal waves, and we feel earthquakes through seismic waves.
Wave Speed: Wave speed is the speed with which a wave propagates via a particular medium.
When we watch a wave on the beach, we can estimate the wave speed by observing how fast it moves across the sand.
Wavelength: Wavelength is the distance between two corresponding points on a wave, such as the distance between two crests.
We can measure the wavelength of light using a spectroscope.
Frequency: Frequency is the number of waves that pass a given point in a given amount of time, such as the number of waves passing a fixed point in one second.
We use frequency to measure the pitch of sound or the radio frequency of a station.
Amplitude: Amplitude is the maximum displacement of a wave from its resting position, such as the height of a wave from its crest to its trough.
The amplitude of a sound wave determines how loud the sound is.
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The front bumper on the go-kart is rated to withstand a force of 50,000 N. If the
driver crashes into a brick wall at 4 m/s and the impact lasts 0.05 seconds, will the
bumper be crushed? (Assume the go kart's speed will be 0 m/s after the collision.)
The front bumper on the go-kart is rated to withstand a force of 50,000 N. If the driver crashes into a brick wall at 4 m/s and the impact lasts 0.05 seconds, the bumper will not be crushed.
What is force?A force is an effect that changes, or accelerates, the motion of a mass-containing object. It is a vector quantity since it can be either a push or a pull and always has magnitude and direction. It is denoted by the letter F and is measured in newtons (N), the SI unit of force. Newton's second law originally stated that the rate at which an object's momentum changes over time is equal to the net force acting upon it. The acceleration of an object is directly proportional to the net force exerted on the object, is in the direction of the net force, and is inversely proportional to the mass of the object if the mass of the object is constant.
Explanation:No, the bumper will not be crushed in the collision. The equation for calculating the force of an impact is F = m×a, where F is the force of the impact, m is the mass of the go-kart, and a is the change in velocity of the kart. The force of the impact in this case is F = m× [tex]\frac{4m/s}{0.05 s}[/tex] = 800 m/s. This is much lower than the 50,000 N rating of the bumper, meaning that the bumper will not be crushed.
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The school bus slows from 60 km/h to 40 km/h when entering the school zone.
Given that this change of speed occurred over 8 seconds, calculate the average deceleration of the bus.
To calculate the average deceleration of the bus, we can use the following formula:
Average deceleration = (Final velocity - Initial velocity) / Time takenHere, the initial velocity (v1) is 60 km/h, the final velocity (v2) is 40 km/h, and the time taken (t) is 8 seconds. To make the units consistent, we'll convert the velocities from km/h to m/s.
1 km/h = 1000 m / 3600 s = 5/18 m/sv1 = 60 km/h * (5/18) = (60 * 5) / 18 = 50/3 m/s v2 = 40 km/h * (5/18) = (40 * 5) / 18 = 100/9 m/sNow, we can plug the values into the formula:
Average deceleration = (v2 - v1) / t Average deceleration = ((100/9) - (50/3)) / 8Now, we'll find a common denominator for the fractions and simplify:
Average deceleration = ((300 - 450) / 27) / 8 = (-150 / 27) / 8Lastly, we'll divide the fraction by 8:Average deceleration = -150 / (27 * 8) = -150 / 216So, the average deceleration of the bus is approximately -150/216 m/s².
calculate the torque procured by the same 75N force when a pipe extends the length of the wrench to 0.5m
Answer: 37.5 N-M
Explanation:
the value of the total radiant energy flux density at the earth from the sun normal to the incident rays is called the solar constant of the earth. the observed value integrated over all emission wavelengths and referred to the mean earth-sun distance is:
The observed value of the total radiant energy flux density at the earth from the sun, integrated over all emission wavelengths and referred to the mean earth-sun distance, is approximately 1,366 watts per square meter.
This value is known as the solar constant and is an important factor in understanding the earth's climate and energy balance. It represents the amount of solar energy that is received per unit area at the top of the earth's atmosphere and is a key input for models of global climate change.
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an electric car's home battery charger uses 8.7 kilowatt for 11 hour. lf electricity costs s0.06 perkilowatt-hour, how much (in dollars, to the nearest penny) does it cost to charge the car's battery?use exact numbers; do not estimate.
The cost to charge an electric car's home battery charger is $52.02 (to the nearest penny).
The cost to charge an electric car's home battery charger can be calculated using the following equation:
Cost = (kW x hours x rate)
Where kW stands for kilowatts, hrs stands for hours and rate stands for the rate per kilowatt-hour.
In this case, we have: kW = 8.7, hrs = 11 and rate = $0.06
Therefore, Cost = (8.7 x 11 x 0.06) = $52.02
Therefore, it will cost $52.02 (to the nearest penny) to charge the car's battery.
To calculate this cost, we first multiply the kW (8.7) by the hours (11) to get the total kWh used (95.7). We then multiply this number by the rate ($0.06) to get the total cost of charging the battery ($52.02). This cost is to the nearest penny as we rounded up to the nearest cent when multiplying the kWh by the rate.
Complete Question:
An electric car's home battery charger uses 8.7 kilowatts for 11 hours. If electricity costs $0.06 per kilowatt-hour, how much (in dollars, to the nearest penny) does it cost to charge the car's battery? Use exact numbers; do not estimate.
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an energy of u0 is stored in an inductor when the current flowing through it is i0. if the current is doubled to 2i0, the energy stored is closest to: a) zero. b) u0 c) 2 u0 d) 4 u0 e) u0/2.
Answer:
(D - 4u0)
E (stored is proportional to I^2 if I is current thru inductor)
two harmonic light waves with amplitudes of 0.9 and 1.7 interfere at some point p on a screen. what visibility results there if a) their electric field vectors are parallel and b) if they are perpendicular?
(a) The visibility at point P will be 0.4 if the electric field vectors of the two waves are parallel.
(b) The visibility at point P will be 1.0 if the electric field vectors of the two waves are perpendicular.
The visibility of interference fringes is given by the formula: V=(I_max-I_min)/(I_max+I_min), where I_max is the maximum intensity and I_min is the minimum intensity.
In case (a), when the electric field vectors of the two waves are parallel, the two waves will interfere destructively at some points on the screen, resulting in a minimum intensity of I_min=-2.6. The maximum intensity of I_max=2.6 occurs at some other points where the two waves interfere constructively. Plugging these values into the formula for visibility, we get V=0.4.
In case (b), when the electric field vectors of the two waves are perpendicular, the two waves will interfere constructively at all points on the screen, resulting in a minimum intensity of I_min=0. The maximum intensity of I_max=2.88 occurs when the two waves are in phase. Plugging these values into the formula for visibility, we get V=1.0, which means that the interference fringes are completely visible.
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a student wished to calculate the specific heat capacity of copper. He has a block of copper and an electrical heater. He knows the power of the heater. Which other apparatus does he need
The student needs a thermometer to measure the change in temperature of the copper block. Therefore, the answer is thermomter and watch.
Option D is correct.
What is a thermometer?A thermometer is described as a device that measures temperature or a temperature gradient.
An instrument that measures temperature is a thermometer.
It is able to gauge the temperature of solids like food, liquids like water, and gases like air. Celsius, Fahrenheit, and kelvin are the three most popular temperature measuring units.
The metric system includes the Celsius scale.
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