Hi.
It must be 4"5 because I had stated and erconsided to be the ultimate eeee
The forces exerted by Earth and a skier become an action-reaction force pair when the skier pushes the ski poles against Earth. Explain why the skier accelerates while Earth does not seem to move at all.
Because of the earth's large mass and solid structure, the skier moves but the earth does not.
Why can't the earth be moved?Because the Earth is such a massive body, it cannot be moved by applying force to it. Because it cannot be moved with a small amount of forceThe amount of matter contained in an object is what gives it inertia, or the tendency of matter to remain at rest if at rest, or to continue moving in the same direction at the same speed if moving. The greater an object's mass, the greater its gravitational force.Mass is the quantity that is solely determined by an object's inertia. The greater an object's inertia, the greater its mass. A heavier object is more likely to resist changes in its state of motion. we can conclude that the skier moves but the earth does not due to the large mass of the earth and its solid structure.To learn more about earth refer to :
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How much braking distance will it take a vehicle to stop on a dry surface, when driving at a speed of 60 mph?.
Braking distance - It will take approximately 133 feet for a vehicle to stop on a dry surface when driving at a speed of 60 mph.
What is braking distance?
When you apply the brakes, your car will move this far before coming to a complete stop. As you increase your speed, the braking distance for the same car in the same circumstances will grow. The Highway Code provides typical braking distances for various speeds because of this. The published road brake pedal performance tests for almost all current production vehicles show braking distances from 60 mph that really are typically 120 to 140 feet, just under half of the anticipated safety distances.
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Aliya is making hot chocolate by adding cocoa powder to hot water. She notices that the cocoa powder dissolves very quickly when she adds it to hot water as compared to cold water without much stirring. Why do you think this happens?
A: The cold temperature and small size of particles increase the rate of dissolving.
B: The hot temperature and color of the powder increase the rate of dissolving.
C: The hot water and large size of particles increase the rate of dissolving.
D: The hot water and small size of particles increase the rate of dissolving.
Answer:
D
Explanation:
self-explanatory:
higher temperature increases rate of dissolving
smaller particles means a larger surface area,therefore increasing rate of dissolving as more of the solute is in contact with the solvent at one time.
if Kerri Walsh has a vertical leap of 1.1m, a) what is her take off speed and b) her hang time (total time to move upwards to the peak and then return to the ground)?
Heightpeak = 12 * (vtakeoff^2 / 9.81) Using the above calculation and takeoff velocity, we can then calculate an individual's true vertical jump height. The Law of The Conservation of Energy states that "the total mechanical energy in a system remains constant."
take off velocity = [tex]\sqrt{21.56}[/tex] =4.64 m/s .
Does speed affect vertical jump?In the vertical jump, force is the maximum amount of strength a person has, and velocity is the maximum amount of speed a person has. Your vertical jump will improve if you increase your strength and velocity (in relation to your body weight).Heightpeak = 12 * (vtakeoff^2 / 9.81) Using the above calculation and takeoff velocity, we can then calculate an individual's true vertical jump height. The Law of The Conservation of Energy states that "the total mechanical energy in a system remains constant."V^2 = 2 x h x 9.8
= 2 x 1.1 x 9.8 =21.56
take off velocity = [tex]\sqrt{21.56}[/tex] =4.64 m/s
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if you are traveling at 49.00 miles per hour, what is your speed in feet per second? (1 mile=5280 ft) report your answer with four significant figures.
The converted unit from mile per hour to feet per second is 71.87 ft/s.
We need to know about unit conversion to solve this problem. The unit conversion can be used to convert a unit to another unit. It can be defined as
a = xb
where a is unit a, b is unit b and x is the constant of conversion.
From the question above, we know that
v = 49 miles/hour
1 mile = 5280 ft
By substituting the given parameters, the converted unit is
v = 49 miles/hour
v = 49 x (5280 ft) / (3600 s)
v = 49 x 1.47 ft/s
v = 71.87 ft/s
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when a proton moves in the same direction as the electric field is pointing, we can conclude that:
Answer:
"the proton is decelerating" because electric field is directed away from a positive charge and a proton would tend to move away from a positive charge.
Since a proton would typically move away from the positive charge and an electric field is pointed away from such a positive charge, "the proton is decelerating."
What is an electric field?When a charge is available in any form, a point in space has an electric field that is a physical characteristic of electricity. The value of E, often known as electric field strength, applied electric intensity, or just the electric field, is a mathematical constant that describes the strength and direction of an electric field.
All that is required to predict what will happen to electrostatic force close to a specific spot is information of the magnitude of the electromagnetic current at that location, not any precise information of what generated the field.
In instead of thinking of the electric force as the result of two electric charges coming into contact directly, one charge is thought of as the source of an electromagnetic current that radiates outward into the surroundings.
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A 0.30-kg mass attached to the end of a string swings in a vertical circle (R = 1.6 m), as shown. At an instant when theta = 50°, the tension in the string is 8.0 N. What is the magnitude of the resultant force on the mass at this instant?
The magnitude of the resultant force on the mass at this instant is 10.43 N.
What is the magnitude of the resultant force?The magnitude of the resultant force is sum of the all the forces acting on the mass.
The magnitude of the resultant force is obtained from the vertical component of the forces and horizontal component of the forces.
Sum of the vertical component of the forces is calculated as follows;
Wy = W sin (90)
where;
W is the weight of the massWy = (0.3 kg x 9.8 m/s²) sin (90)
Wy = 2.94 N
Ty = T sin (50)
where;
T is tension in the stringTy = 8 sin (50)
Ty = 6.13 N
∑Y = Wy + Ty
∑Y = 2.94 N + 6.13 N
∑Y = 9.07 N
Sum of the horizontal component of the forces is calculated as follows;
Tx = T cos (50)
Tx = 8 x cos (50)
Tx = 5.14 N
Wx = W cos (90) = 0
The resultant force is calculated as follows;
F = √ (∑Y² + ∑X²)
F = √ (9.07² + 5.14²)
F = 10.43 N
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a photon of electromagnetic radiation has an energy of 4.17 x 10 -19 joules. calculate the frequency and wavelength of this radiation.
A photon of electromagnetic wave with energy of 4.17 x 10 -19 Joules will have frequency of 6.29 x 10¹⁴ Hz and wavelength of 4.77 x 10⁻⁷ m.
The energy carried by a photon is given by:
E = h.f
Where:
h = Planck's constant = 6.626 × 10⁻³⁴ J. s
Substitute E = 4.17 x 10⁻¹⁹ Joules into the formula:
4.17 x 10⁻¹⁹ = 6.626 × 10⁻³⁴ . f
f = 4.17 x 10⁻¹⁹ / 6.626 × 10⁻³⁴ = 6.29 x 10¹⁴ Hz
The wavelength is:
λ = c/f
where
c = speed of light = 3 x 10⁸ m/s
Hence,
λ =3 x 10⁸ / 6.29 x 10¹⁴ = 4.77 x 10⁻⁷ m
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as the distance between two object increases how does the force of gravity between them decrease
An object with a mass of 1298 kg is accelerating at a rate of 17 m/s² when a net force is applied to it. What is the magnitude of the net force that is acting on the object? Show your work.
An object with a mass of 1298 kg is accelerating at a rate of 17 m/s² when a net force is applied to it is 22066 Newton.
What is force?A force in physics is an effect that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Given that in the question an object with a mass of 1298 kg is accelerating at a rate of 17 m/s² when a net force is applied to it. The magnitude of the net force that is acting on the object is,
F = ma
F = 1298.17
F = 22066 Newton
The magnitude of the net force that is acting on the object 22066 N.
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the pressure at the bottom of a jug filled with water does not depend onquestion 29 options:surface area of the water.the acceleration due to gravity.the height of the liquid.water density.
A water-filled jug's bottom pressure is independent of the water's surface area.
What is surface area?The surface area of a 3D object is the total area that all of its faces occupy. In order to calculate how much paint is required to paint a cube, for example, we must first measure the cube's surface area. stated exclusively in square units.
The total area that an object's surfaces occupy is referred to as its surface area. The formulas make it straightforward to calculate the surface areas of various 3D geometric shapes.
Although they all try to determine the total area occupied by all of the objects' faces, the surface area formulas for each geometric shape differ from one another.
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the cooling effect inside a refrigerator is produced byquestion 14 options:replacing the warmer air with colder airproper insulation.an electric motor that converts electrical energy into internal energy.vaporizing the refrigeration liquid
The refrigeration liquid is vaporized to create a chilling effect within a refrigerator.
How do fridges operate?In order for refrigerators to function, the refrigerant that circulates inside of them must transform from a liquid into a gas. Evaporation is the process that causes this cooling and results in the desired outcome.
The cooling effect is what?Any surface that has a liquid on it that is evaporating will be colder than the surroundings. The cooling effect occurs when gases in an air conditioner are liquefied to the point where they will quickly evaporate at room temperature, making the environment cooler.
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Study the earth view panel at the top of the window. Would this planet be a good candidate for a transit observation? why or why not?.
Yes, because from the perspective of Earth, the planet appears to move in front of the star.
What do you understand by the term transit observation?
When a planet passes in front of an observer and a star, it is said to be transiting. When Venus or Mercury pass in front of Earth and the Sun, transits inside our solar system can be seen from the planet.
Therefore, Earth would be a good candidate for a transit observation as from the perspective of Earth, the planet appears to move in front of the star.
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a cannonball is fired with a velocity of 551 m/s in the cannon is aimed 12° above the ground , how far away does the cannonball land?
The cannonball lands 12.4 km from the cannon if the cannonball is fired with a velocity of 551 m/s in the cannon is aimed 12° above the ground.
R = u² sin 2θ / g
R = Horizontal range
u = Initial velocity
θ = Angle made with ground
g = Acceleration due to gravity
u = 551 m / s
θ = 12°
g = 9.8 m / s²
R = 551² sin 2 ( 12° ) / 9.8
R = 303601 * 0.4 / 9.8
R = 12392 m
R = 12.4 km
The horizontal range of a projectile is the horizontal distance travelled by the projectile from the point from which it was launched. It is denoted by R.
Therefore, the cannonball lands 12.4 km from the cannon
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A ball is thrown horizontally from the top of a building 130 m high. The ball strikes the ground 74 m horizontally from the point of release. What is the speed of the ball just before it strikes the ground? Answer in units of m/s
If a ball is thrown horizontally from the top of a building 130 m high, then the velocity of the ball when it hit the ground would be 50.50 m/s.
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.
As given in the problem a ball is thrown horizontally from the top of a building 130 m high. The ball strikes the ground 74 m horizontally from the point of release,
v = √(2 × g × h)
By substituting the respective values of the height and gravity
v = √(2×9.81×130)
v =50.50 m/s
Thus, the velocity of the ball when it hit the ground would be 50.50 m/s.
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9. Waves originate from
Wind is the most frequent cause of waves. The friction between the wind and the surface of the water produces wind-driven waves, also known as surface waves. A wave crest is produced when wind continuously disturbs the water's surface in an ocean or lake.
What is meant by wave?A wave exists an energetic disturbance in a medium that doesn't include any net particle motion. Elastic deformation, a change in pressure, an electric or magnetic intensity, an electric potential, or a change in temperature are a few examples.
Wind is the most frequent cause of waves. The friction between the wind and the surface of the water produces wind-driven waves, also known as surface waves. A wave crest is produced when wind continuously disturbs the water's surface in an ocean or lake.
Waves are oscillations or vibrations that revolve around a resting point. As an illustration, sound waves force air molecules to oscillate. Water molecules vibrate up and down due to ripples.
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a person jumps from a tower 5.0 m high. when he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.70 m. if the mass of his torso (excluding legs) is 50 kg, find (a) his velocity just before his feet strike the ground, and (b) the average force exerted on his torso by his legs during the deceleration
a) v = 9.8 m/s is his velocity just before his feet strike the ground.
b) When he slows down, his legs apply an average force of 3430 N to his torso.
What is deceleration?Therefore, deceleration is defined as a reduction in speed as the body moves away from the beginning location. The opposite of acceleration is deceleration.
Given parameters;
Height of the tower , h = 5.0m
Distance of deceleration, d = 0.70m
Mass of the tensor, m = 50 kg
Final speed of the person calculated as:
1/2mv² = mgh
v² = 2gh
v = [tex]\sqrt{2gh}[/tex]
v = [tex]\sqrt{2*9.8*5}[/tex]
v = 9.8 m/s.
The torso's deceleration over the specified distance is
v² = u²+2as
a = v²-u²/2s
a = 0- 9.8²/2*0.7
a = 68.6m/s²
The average amount of force his legs apply to his body as he slows down is:
F = ma
F = 50× 68.6
F = 3430 N.
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How have glider pilots learned to use convection currents to stay in the sky and travel long distances?.
The air at ground level rises to form convection currents.
It creates lift upon collision with the glider's wing allowing it to stay in the air or even rise to higher altitudes. Thermals occur when the sun heats the ground and the ground warms the air above. As small plumes of warm air rise, they gather together to form thermals, the perfect place for gliders to fly and stay airborne. So the density of nearby air decreases.
This less dense air rises and helps birds fly farther. Dense air replaces this space. This movement is known as convective air currents. We know that draft is the movement of air uplifted by temperature differences between rising strata. Therefore, when a bird flies over this updraft column, this convective air current allows the bird to reach higher altitudes without additional effort.
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An object falls freely from rest near the surface of earth how far has the object fallen after 5 seconds
when you apply the brakes on your car, the kinetic energy of your vehicle is transformed into thermal energy in your brake disks. during a mountain descent, a 28.00-cm-diameter iron brake disk heats up from 30∘c to 170∘c. cheg
The friction between a vehicle's brakes and the wheel is worked on when a force is applied to the brakes. The vehicle's kinetic energy is decreased, which slows it down and raises the temperature of the brakes.
What happens to a car's kinetic energy when you depress the accelerator?The electric motor starts functioning as a generator as soon as your foot leaves the accelerator pedal. It begins to recharge the battery by utilizing the kinetic energy that is released while the automobile is going ahead. Depending on the setting chosen, this results in a stronger than typical slowdown of the vehicle.
Braking has to adhere to the energy conservation concept, just like any other system. Energy can only be changed from one form to another; it cannot be generated or destroyed.
Chemical energy (fuel, air, and spark plugs) is converted inside the engine to mechanical energy known as kinetic energy.
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Answer: .28 meters
Explanation:
An airship moving north at 55.0 km/h with respect to the air encounters a wind from 17.0° north of west. If the wind’s speed with respect to Earth is 40.0 km/h, what is the airship’s velocity with respect to Earth?
The airship’s velocity with respect to Earth is -60.1° west of north.
Velocity is the speed at which something moves in a particular direction.
Vaw = 55.0 km/h, north
Vwe = 40.0 km/h at 17.0°
north of west,
Vae = Vaw + Vwe
Vx, ae = Vx, aw + Vx, we = Vwe (cos θwe)
Vy, ae = Vy, aw + Vy, we = Vaw + Vwe(sin θwe)
θwe = 180.0° − 17.0° = 163.0°
Vx, ae = (40.0 km/h)(cos 163.0°) = −38.3 km/h
Vy, ae = 55.0 km/h + (40.0 km/h)(sin 163.0°) = 55.0 km/h + 11.7 km/h
= 66.7 km/h
Vae = √(Vx, ae)²+(Vy, ae0)²
= √(−38.3km/h)²+(66.7km/h)²
= √ 1. 47×10³ + 4.45×10³
= 5. 92×10³km²/h²
= 76.9 Km/ hr.
θ = tan⁻¹ ( Vy,ae / Vx, ae)
θ = tan⁻¹ ( 66.7 / -38.3 )
θ = −60.1° west of north
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C₂H₂O+40₂ 3C0₂+3H₂O
2
Which reaction does it show a synthesis reaction, a decomposition reaction or a combustion reaction?
C2H2O+4O2 → 3CO2 + 3H2O shows a combustion reaction.
Combustion reaction is chemical reaction of substances including oxygen and accompanied by the generation of heat and light. Lighted match is an example of a combustion reaction. Combustion reaction takes place in the presence of oxygen as a reactant and products given are carbon dioxide, water and heat.
Combustion is an exothermic reaction which means that energy is released. Heat and light are released in a combustion reaction. During exothermic reactions, bonds are broken, which allows the energy stored in the bonds to be released and perform work. Exothermic reactions are chemical reactions that produce heat in the product. We say that the heat flow q is negative when heat flows from the system to the surrounding. Thereby, exothermic reactions have negative ΔH of the reaction.
Types of combustion are:
Rapid Combustion, Spontaneous Combustion and Explosive Combustion.
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A 1200 kg bovine accelerates uniformly from a speed of 5.0 m/s to 12.0 m/s. During this acceleration it travels 94 m. What is the magnitude of the net force acting on the bovine?
The magnitude of net force acting on the bovine is
An item is considered to be in uniform acceleration when it is moving in a straight path while accelerating at regular intervals of time. here we have to find what is the net force acting on the body.
initial speed(u)= 5.0 m/s
final speed (v)= 12.0m/s
distance travel(x)= 94m
mass (m)=1200kg, t=time period
according to force equation f=ma
we know that Δv=Δx/Δt
Δt=Δx/Δv= 94/7
here we have to find acceleration
a =u-v/Δt, a=49/94=0.52
by putting all the value in force equation f=ma= 1200* 0.52=625.53 N
WHAT IS ACEELERATION ?
Acceleration is the rate at which an object's velocity with respect to time changes. They are vector quantities, accelerations.
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A crate is pushed off the edge of a building which is 160 m tall. The crate lands 35 m from the base of the building.
a) how fast was the crate pushed?
b) how fast will it be moving when it hits the ground?
By considering the horizontal component of the motion, the speed at which the crate was pushed is 13.1 m/s. Also, by considering the vertical component of the motion, the speed at which it hits the ground is 56 m/s
Motion Under GravityMotion of any object under gravity is the vertical motion of the object moving under the influence of acceleration due to gravity.
Given that a crate is pushed off the edge of a building which is 160 m tall. The crate lands 35 m from the base of the building.
a) how fast was the crate pushed can be known with the use of the formula R = ut
Where
R = 35 mu = the speed at which the create is pushedt = ?From the vertical perspective, h = ut + 1/2gt²
where u = 0 and h = 35 m
35 = 1/2 × 9.8 × t²
35 = 4.9t²
t² = 35/4.9
t² = 7.14
t = √7.14
t = 2.67 s
Substitute t and R into the formula R = ut to get u
35 = 2.67u
u = 35/2.67
u = 13.1 m/s
b) how fast will it be moving when it hits the ground can be known by using the formula
v² = u² + 2gH
v² = 0 + 2 × 9.8 × 160
v² = 3136
v = √3136
v = 56 m/s
Therefore, the crate was pushed as fast as 13.1 m/s and it was moving as fast as 56 m/s when it hits the ground.
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i need help with converting kinetic energy into potential
All electrons have energy stored in them which is potential energy.
Pressure increases the electron's kinetic energy causing it to move faster and eventually jump to a wider orbit. Each electron then stores energy, which becomes potential energy. Kinetic energy can be converted into other forms of energy and vice versa. For example, kinetic energy is converted into electrical energy by a generator or into thermal energy by a car's brakes.
Energy is not destroyed or lost in the transition from potential energy to kinetic energy. It just converts from one type of energy to another type of energy. This is known as the law of conservation of energy. When a person rides a bicycle to the top of a hill, the kinetic energy of movement is converted into potential energy and stored in the bicycle at the top of the hill. The potential energy stored in the bike at the top of the hill can be used to roll the bike down the hill.
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A noise of -1 decibels is...
Select one:
a. audible.
b. harmful.
c. ultrasonic.
d. subaudible.
Clear my choice
A noise of 1 decibel is subaudible. Option D.
When it comes to human hearing noise below 70 dB is considered safe. 1 decibel is below this limit so this level is considered safe for human hearing. Noise above 85 dB is considered potentially dangerous with prolonged exposure. The human hearing threshold is approximately 0 decibels.
Above this threshold sounds with higher sound pressure levels are perceived as louder. To make the noise twice as audible the noise must be increased by 10 dB. For example, 10 violins can only be heard twice as loud as 1 violin. The risk of hearing loss from noise increases with sound intensity, not loudness. Almost all firearms produce noise in excess of 140 dB small. 22 caliber rifles can make about 140 dB of noise while large caliber rifles and pistols can make more than 175 dB of noise.
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what are the forces acting on the rock that is sliding at a constant speed on a frictionless surface? (ignore air resistance unless otherwise stated)
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if two wind-driven waves moving from different directions came together in such a way that the wave crests overlap to form a single crest, what would happen to the size of the waves? the newly formed wave would
If two wind-driven waves moving from different directions came together in such a way that the wave crests overlap to form a single crest, it would become larger than that of the two original waves.
The interaction of waves with other waves is called wave interference. Wave interference may occur when two waves that are traveling in opposite directions meet. If two waves are shifted by exactly half a wavelength when they merge, then the crest of one wave will match up perfectly with the trough of the other wave, and they will cancel each other out.
Wave interference:
When two waves come close to one another their effects and together. If the crests, or highest parts of the waves, line up perfectly, then the crest of the combined wave will be the sum of the heights of the two original crests.
Therefore when the two wave crests overlap to form a single crest then it would become larger than the two original waves.
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what is the force of a 20 kilo gram rock on earth
Answer: [Ans. 196 N] Was this answer helpful?
If the Earth actually had two moons as observed in the image, which of the following would be observed?
time would run faster on Earth due to the increased gravity field
objects falling on Earth would double in their acceleration
the difference in high tides and low tides would be greater
the Earth's rotation would speed up
everyone' weight on Earth would increase
All of the above would be observed
The following would be observed Time would run faster on Earth due to the increased gravity field. Option A.
If the second moon's gravitational influence is extreme it can produce tremendous flood tides up to 1 kilometer high and frequent tsunamis. It can also lead to increased volcanic activity and earthquakes. The moon rotates in a circle around the earth due to its centripetal force.
Without the centripetal force, the Moon would not follow a circular orbit but would move in a straight line tangent to its orbit. Tides The gravitational pull of the moon pulls the earth especially the part closest to the moon. As a result of this force, the earth's crust rises slightly a few centimeters. Even ponds and lakes like the Great Lakes experience neap tides.
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