Answer:
Lightning and thunder are produced simultaneously, but the thunder is heard a few seconds after the lightning is seen. This is because the speed of light in air is more than the speed of sound in air.
The speed of light is given as 3×10
8
m/s. The speed of sound is 340 m/s. Thus, the entire time of 10 seconds (as mentioned in the question) between seeing the light and hearing the thunderstorm is taken by the sound to travel to the observer. Hence, the distance traveled by the thunder is given as follows.
s=vt; where,
s is the distance traveled, v is the velocity of sound and t is the time taken.
That is, 330m/s×10s=3400m=3.4km.
Thus, the distance traveled by the thunder is 3.4km.
Explanation:
Answer:
Explanation:
Given:
V = 340 m/s - Sound speed
t = 10 c
______________
S - ?
S = V·t = 340·10 = 3 400 m
Newton's 2nd law states that, the acceleration of an object as ______________ is _________________to the magnitude of the __________, in the same ______________ as the net force, and _______________ to the ____________________ of the object.
Answer:
Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Lesson 6 Atoms
Write a descriptive essay about radioactive decay.
Include the following essential content points:
*ideas about what causes radioactive decay
*the rate at which radioactive decay occurs
Radioactive decay is the emission of power inside the shape of ionizing radiation.
Ionizing radiation can have an effect on the atoms in dwelling things, so it poses a health danger by using negative tissue and DNA in genes.. The ionizing radiation that is emitted can consist of alpha debris.
In alpha decay, the nucleus loses two protons. In beta decay, the nucleus either loses a proton or gains a proton. In gamma decay, no alternate in proton quantity takes place, so the atom does no longer end up a specific element.
Radioactivity is the term used to explain the natural procedure via which some atoms spontaneously collapse, emitting both particles and power as they remodel into exclusive, greater solid atoms. This technique, also called radioactive decay, occurs due to the fact unstable isotopes have a tendency to transform into a more stable country.
Radioactive decay is very critical for a wide range of human sports, from medicinal drug to power production and past, and also to astronomers. The simplest manner that this will happen is by way of converting the range of protons in the nucleus.
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Dylan and Sophia are walking along Bluebird Lake on a perfectly calm day. Dylan, determined to impress Sophia by his ability to skip rocks, picks up the flattest rock he can find and gives it a sidearm launch from the edge of the water. The rock acquires a completely horizontal speed of 27.2 m/s from a height of 0.54 meters above the water surface. How far does it go horizontally before it hits the water?
Question 17 options:
0.3 meters
9.1 meters
0.1 meters
14.7 meters
The horizontal distance travelled by the rock before it hits the water is 9.0 m.
What is the time of motion of the rock?The time of motion of the rock is the time taken for the rock to fall from the given height.
h = vt + ¹/₂gt²
where;
h is the height of fallv is the vertical velocity = 0t is the time of motionh = ¹/₂gt²
t = √(2h/g)
t = √(2 x 0.54 / 9.8)
t = 0.33 s
The horizontal distance travelled by the rock before it hits the water is calculated as follows;
X = vt
where;
v is horizontal velocityt is time of motionX = 27.2 m/s x 0.33 s
X = 9.0 m
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A cannonball is launched upward with a velocity of 85.5m/s at an angle of 30 degrees above the horizontal.How long is the cannonball in the air?
ANSWER
[tex]8.72s[/tex]EXPLANATION
To find the time of flight, apply the formula for a projectile's time of flight:
[tex]T=\frac{2u\sin \theta}{g}[/tex]where u = initial velocity
θ = angle of launch
g = acceleration due to gravity
Therefore, the time of flight of the cannonball is:
[tex]\begin{gathered} T=\frac{2\cdot85.5\cdot\sin 30}{9.8} \\ T=8.72s \end{gathered}[/tex]A 2.5 kg ball moving at 4.2m/s collided with a 2.5 kg stationary ball. If the first ball is at rest after the collision what is the velocity of the second ball
We need to apply the conservation of momentum formula
[tex]m1u1+m2u2=m1v1+m2v2[/tex]Where m1 and m2 are the masses, u1 and u2 are the initial velocities of each mass, and v1 and v2 are the final velocities of each mass
we have
m1= 2.5 kg
u1= 4.2 m/s
m2=2.5 kg
u2= 0 m/s
v1=0 m/s
v2=?
we substitute
[tex]2.5(4.2)+2.5(0)=2.5(0_{})+2.5(v_2)[/tex]therefore
[tex]v2=4.2\text{ m/s}[/tex]ANSWER
v2=4.2 m/s
A cube with an edge of length l = 4 cm is placed in a uniform magnetic field throughout the region that has components Bx = 0 T, By = 4 T and Bz = 3 T. Find the net flux through the cube.Group of answer choices0 Tm20.00640 Tm20.00480 Tm20.120 Tm20.160 Tm2
Given,
Length of the edge, l=4 cm.
The magnetic field components:
[tex]\begin{gathered} B_x=0T \\ B_y=4T \\ B_z=3T \end{gathered}[/tex]To find
The net flux through the cube.
Explanation
Through any closed surface the total magnetic flux is always zero.
Thus the net flux through the cube is zero
Conclusion
The answer is
[tex]0Tm^2[/tex]What happens when a magnet is moved back and forth inside a wire coil?A.Electric charges begin flowing through the wire.B.The magnetic force decreases.C.Electric charges begin flowing through the magnet.D.The magnetic force increases.
According to electromagnetic induction, a change in the magnetic field induces a current in the circuit.
Thus, electric charges begin flowing through the wire when the magnet is moved back and forth inside a wire coil.
Which is the best statement of the Law of Conservation of Energy? (1 point)
The amount of energy put out by a simple machine is always less than the amount of energy put into the machine
The amount of energy put into a simple machine should be conserved Item
The amount of energy put out by a simple machine depends on its efficiency
The amount of energy put out by a simple machine must equal the amount of energy put into the machine
The best statement of the Law of Conservation of Energy is option D. The amount of energy put out by a simple machine must equal the amount of energy put into the machine.
The regulation of conservation of energy states that the entire electricity of an isolated system remains steady; it's far stated to be conserved over time.
The law of conservation of power is a physical law that states strength cannot be created or destroyed but can be modified from one form to some other. any other manner of pointing out this regulation of chemistry is to mention the full electricity of a remoted device stays regular or is conserved within a given body of reference.
The law of conservation of energy states that power can neither be created nor destroyed - best converted from one form of energy to some other. this means that a device constantly has an equal quantity of power unless it is added from the out of doors.
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The meter bridge shown in the figure is balanced when the slide wire is divided as shown in the figure. Find the value of the resistance X
A person starts at a point on a square which has a side of 1.5 metres in the clockwise direction and reaches the same point after time of 4 s . The value of distance is
To find the distance traveled, we just have to add all the side lengths of the square, in other words, the perimeter.
[tex]\begin{gathered} P=1.5m+1.5m+1.5m+1.5m \\ P=6m \end{gathered}[/tex]Therefore, the value of the distance is 6 meters.If a light ray strikes a flat mirror at an angle of 27° from the normal, the reflected ray will be63° from the normal.27° from the mirror’s surface.27° from the normal.90° from the mirror’s surface.
We will have the following:
We know by the laws of reflection that the reflection will be equal to the angle of incidence. Thus, the reflected ray will be 27° from the normal.
Wes places red blood cells in a petri dish with pure water and observes them
under a microscope. He drew a model to illustrate his observations.
What is the most likely explanation for Wes's observations?
a. The red blood cells were placed into an isotonic solution. Water moved into
and out of the cells to maintain homeostasis.
b. The red blood cells were placed into an isotonic solution. Water moved into
the cells until the cells burst.
c. The red blood cells were placed in a hypertonic solution. Water moved from
the inside of the cells to the outside of the cells to maintain homeostasis.
d. The red blood cells were placed in a hypotonic solution. Water moved from
the outside of the cells to the inside of the cells until the cells burst.
Describe the fit* formula for moderate physical activities
Fit formula for moderate physical activities is Frequency , intensity , time and type exercise.
The FIT formula of achieving healthy lifestyle is frequency , intensity type and time exercise. It is a flexible exercise framework for achieving health and well being.
Frequency is how often you exercise . Intensity is how hard you are working . Type is a type of exercise you are doing and Time is how long you exercise .F = 5 or more days per week . I = equal to brisk walk. T = at least 30 to 60 mins.
Thus, FIT formula for moderate physical activities is Frequency , intensity , type and time exercise.
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Two different objects are moving with different velocities until they strike each other, stick to each other, and begin moving together. If each object’s mass is known and each object’s initial velocity is known, then the final velocity can be predicted using the law of conservation of
Energy
Momentum
Force
Speed
A motor is used to convert:A. electrical energy to gravitational energy.B. electrical energy to mechanical energy.C. nuclear energy to chemical energy.D. mechanical energy to chemical energy
An electric motor is used to convert electrical energy to mechanical energy; therefore, the answer is B.
Conversion of PE into KE
1. A ball is thrown up with a velocity of 10 m/s. How high will it go? (Solve the problem
without using the equation v2=v0−2gΔy. This equation is true, but here we are trying
use PE and KE). Never mind that you are not told the mass of the ball – it will cancel
out.)
If a ball is thrown up with a velocity of 10 meters per second then it will go up to a height of 5.10 meters.
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 if a ball is thrown up with a velocity of 10 meters per second,
The kinetic energy of the ball is getting converted into the potential energy
mg×h = 1/2×m×v²
v² = (2×g×h)
10² = 2×9.8×h
h = 100 / 19.6
h = 5.10 meters
Thus, If a ball is thrown up with a velocity of 10 meters per second then it will go up to a height of 5.10 meters.
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A woman pushes a wheelchair up an inclined plane. The effort force is...Select one:a. the weight of the woman. b. the height of the inclined plane. c. the weight of the wheelchair. d. the force applied by the woman.
When a women pushes the wheelchair up an inclined plane, the effort force will be the force applied by the woman.
Thus, the correct option is (d)
Find the currents through the 8 Ω resistor at the instant that the switch is closed.0.545 A0.744 A0.641 A0.926 A
From the figure,
The resistors are in series
Thus the equiva;ent resistance is:
R=14+8=22 ohm
Thus the current through the equivalent resistance is:
[tex]i=\frac{V}{R}=\frac{12^{}}{22}=0.545\text{ A}[/tex]The answer is 0.545 A
A 3.5-inch floppy disk in an old computer rotates with a period of 2.00 x 10^-1 s. Calculate the angular speed of the disk, the linear speed (in inches/sec) of a point on the rim of the disk, and the linear speed (in inches/sec) of a point 0.750 inches from the center of the disk. (Hint: a 3.5 inch floppy disk has a 3.50 inch diameter)
We have the next information
T=2.00 x 10^-1 s=0.2s
r=3.5 inch
For the angular speed
[tex]\omega=\frac{2\pi}{T}[/tex]where omega is the angular speed, T is the period
We substitute
[tex]\omega=\frac{2\pi}{0.2}=31.41\text{ rad/s}[/tex]For the linear speed on the rim of the disc, we will use the next formula
[tex]v=\omega\cdot r[/tex]in this case r= 3.5/2=1.75 inch
[tex]v=31.41(1.75)=54.97\text{ }\frac{inches}{\text{sec}}[/tex]Then for the linear speed on the point at 0.750 inches from the center of the disk.
[tex]v=31.41(0.750)=23.56\frac{inches}{\text{sec}}[/tex]ANSWER
ω=31.41 rad/sec
v on the rim= 54.97 inches/sec
v on the point=23.56 inches/sec
How many extra protons are on an object with a 8.31x107C charge?7.51x1024 protonsO 1.33x10-25 protons1.93x10-13 protons5.19x1012 protons
To find the number of protons (or electrons) in a charge object we need to divide the total charge on the object by the charge on each proton or electron. The charge of a proton is approximately 1.6e-19, then we have:
[tex]\frac{8.31\times10^7}{1.6\times10^{-19}}=5.19\times10^{26}[/tex]Therefore, the number of extra protons on the object is 5.19e26
Find the answer to the problem
In the given diagram,
The first force applied = F1 = 10N
The second force applied = F2 = 6 N
The net force exerted on the box = F = F1 + F2 = 10 + 6 = 16 N
The mass of the box = 10.6 Kg
As per the Newtons second law of motion,
Force = Mass x Acceleration
⇒ Acceleration = Force/Mass
⇒ Acceleration = 16/10.6
⇒ Acceleration = 1.50 m/s^2
Hence the acceleration of the box is 1.5 m/s^2
What is Acceleration?In layman's terms, acceleration is the ability of a vehicle to increase its speed. The rate of change in an object's velocity with respect to time is known as acceleration in mechanics. In vector quantities, accelerations exist (in that they have magnitude and direction). The direction of the net force that is acting on an object determines its acceleration. According to Newton's Second Law, the amount of an item's acceleration results from the interaction of two factors: the mass of the object, which varies depending on the materials from which it is built, and the net balance of all exterior forces acting on the object.To learn more about Acceleration, refer to:
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What is the best example of potential energy?water flowing in a rivera puddle of water on the floora block of frozen ice on the groundwater in an artificial lake held behind a dam
Answer:
Water in an artificial lake held behind a dam
Explanation:
Potential energy is energy that can be converted to kinetic energy, for example, an object at a certain height has potential energy because we can drop the object to have kinetic energy.
Therefore, the best example of potential energy is water in an artificial lake held behind a dam because without the dam, the water will start to move and it becomes the energy into kinetic energy.
Two cars have a ‘rear end’ collision. A 120 kg Honda moving at 20 m/s strikes a 100 kg Ford moving at 15 m/s. Their bumpers become locked and they continue to move as one mass. What is their final velocity?
Given
Mass of the Honda car, m=120 kg
Velocity of the Honda car, v=20 m/s
Mass of the Ford, m'=100 kg
Velocity of the Ford , v'=15 m/s
To find
The final velocity.
Explanation
The combined velocity is V
By conservation of momentum,
[tex]\begin{gathered} mv+m^{\prime}v^{\prime}=(m+m^{\prime})V \\ \Rightarrow120\times20+100\times15=(120+100)V \\ \Rightarrow V=17.72\text{ m/s} \end{gathered}[/tex]Conclusion
The combined velocity is 17.72 m/s
When interplanetary space travel becomes viable, doctors may suggest to people with arthritis that they vacation on a planet with lower gravitational
attraction and do more walking.
The gravitational acceleration on Earth is 9.8 m/s², while the gravitational acceleration on Mars is 3.7 m/s². How much less force would the
vacationer be applying to their joints when walking on Mars?
Answer: 2.6 times less force
Explanation: I did the assignment <3
Answer:
Gravitational Force, Attraction, and Mass Quick
Explanation:
1)the mass of the object and the planet’s gravitational acceleration
2)2.6 times less force
3)The Earth has a greater gravitational attraction than the Moon.
4)980 N
5)The force would need to be greater, so they would not perform as well.
I did it and have a 5/5 100%
A block of mass =1.25 kg slides along a horizontal table with speed 0=8.00 m/s. At =0, it hits a spring with spring constant =80.00 N/m, and it also begins to experience a friction force.
The coefficient of friction is given by =0.100. How far has the spring compressed by the time the block first momentarily comes to rest?
The distance travelled by the spring compressed by the time the block first momentarily comes to rest is equal to 0.96 meters.
what is work energy theorem?
work energy theorem is an important phenomenon in physics which states that the change in kinetic energy is equal to the work done by the object.
This law is basic part of conservation of energy.
what is newtons law of motion?
Newton's laws of motion are three basic laws of classical mechanics that describe the relationship between the motion of an object and the forces acting on it. These laws can be paraphrased as follows: A body remains at rest, or in motion at a constant speed in a straight line, unless acted upon by a force.
given:
mass of the block = 1.25 kg
speed of the block = 8.0 m/s
spring constant = 80 N/m
coefficient of friction = 0.100 u
on applying the work energy theorem, you would realize,
change in kinetic energy = work done by spring and the friction
final kinetic energy - initial kinetic energy = work done by spring + the work done by friction
0.5 × 1.25 × 64 = 0.5 × 80 × x² + 0.1 × 1.25 × 9.8
x = 0.96 meters
therefore, the distance travelled by the spring compressed by the time the block first momentarily comes to rest is equal to 0.96 meters.
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What space telescope is used to look deep into the universe?
O A.
OB.
O C.
Hubble
Galileo
Penzias
OD. Edwin
A racing car on a flat track travels at 45.0 m/s around a curve with a 55.0 m radius. Find the car’s centripetal acceleration?
Given,
The velocity of the car, v=45.0 m/s
The radius of the circular path, r=55.0 m
The centripetal force is the force directed towards the center that is acting on an object in a circular motion. This is the force that keeps the object in its circular path.
The centripetal acceleration is given by,
[tex]a=\frac{v^2}{r}[/tex]On substituting the known values,
[tex]\begin{gathered} a=\frac{45.0^2}{55.0} \\ =36.82\text{ m/s}^2 \end{gathered}[/tex]Thus, the centripetal acceleration of the car is 36.82 m/s².
Which of the following is NOT an example of a projectile.
O A tennis ball after it is struck by a tennis racket.
O A rocket that is launched from Earth's surface.
OA snowball rolling downhill.
O A football kicked to the goal post.
Snowball rolling downhill is not an example of a projectile.
What is projectile?
A projectile is any object is thrown into space upon the which the only acting force on is gravity. The primary force of the acting on a projectile is the gravity. This doesn't have necessarily mean that other just forces do not act on it, just that their effect is minimal the compared to gravity.
A projectile is any object that once projected or dropped with the continues in motion by its only own inertia and is influenced by only by the downward force of of gravity. By definition, in a projectile has a single force of that acts upon it - the force of gravity.
Thus this is the reason why snowball rolling downhill is not an example of projectile.
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A 8.43-Newton force was applied for an unknown displacement; however, it is known that 376 joules of work was done. What is the value of the
mystery displacement? (1 point)
O 384 m
O 368 m
O 44.6 m
O 3170 m
According to the given statement the value of the mystery displacement is 44.6 m.
The correct option is C.
How does displacement work?The smallest (straight line) distance between a body's initial location and its final position—represented by an arrow pointing from the starting position to the final position—is referred to as a body's displacement when it moves from one position to another. It is a vector quantity.
What is an example of a displacement?For instance, an object's position changes if it moves from position A to position B. The term used to describe this change in an object's position is displacement.
Briefing:F = 8.43 N
Work = 376 J
Work = force × displacement
376 J = 8.43 N × d
d = 44.6 m
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The complete question is -
A 8.43-Newton force was applied for an unknown displacement; however, it is known that 376 joules of work was done. What is the value of the mystery displacement? (1 point)
A. 384 m
B. 368 m
C. 44.6 m
D. 3170 m
Answer:
44.6 m
Explanation:
two unknown materials have a coefficient friction of static friction of 1.3. Without any further information, which of the following options is most likely to be the coefficient of kinetic friction?
We have
the static coeffient friccion = 1.3
The coefficient of kinetic friction is always positive and bigger than 0
Therefore the coefficient of kinetic friction is 1.2
