Answer: D
Explanation: When gasoline is burned in a car engine,chemical energy is converted into mechanical energy.
the Sun is the hottest object in our solar system.
B.
the Sun is the brightest object in our solar system.
C.
the Sun is the most massive object in our solar system.
D.
the Sun is the slowest object in our solar system
b. False
this would be true.
302
324
280
The speed of sound varies in different mediums. In Physics, the speed of sound in air at 0°C is about 331.5 m/s, while in iron it's about 5130 m/s. If a train is 100 km away, the sound travelling through the iron rails would reach you approximately 282 seconds sooner than the sound through the air.
In Physics, the speed at which sound travels depends on the medium through which it's travelling. The speed of sound in air at 0°C is approximately 331.5 m/s. On the other hand, the speed of sound in iron is about 5130 m/s.
To determine how much sooner you would hear the train, we need to calculate the difference in time it takes for the sound to travel through these two mediums.
When the train is 100 km away, we get the following:
The difference is, therefore, approximately: 301.66 - 19.49 = 282.17 seconds. Thus, the sound will reach you 282 seconds sooner if you listen to the rails rather than the air.
#SPJ12
been transmitted.
bounced off .
been absorbed
Correct answer choice is :
C) Bounced off
Explanation:
Reflection is the difference in the path of a wavefront at an interface within two various media so that the wavefront returns into the tool from which it began. Current models involve the reflection of light, sound and water waves. Reflection is when light bounces off an object. If the cover is soft and shiny, like glass, water or bright metal, the light will reflect at the same point as it hit the cover.
up the hill.
(b) Repeat (a) if the vertical height is still 27.3 m, but the angle is 19.6°. What general conclusion can you make?
(c) The child now slides down the hill on the toboggan. Determine the total work on the child and toboggan during the slide.
Explanation:
(a) To determine the work the child must do on the toboggan to pull it at constant velocity up the hill, we can use the work-energy principle.
1. Calculate the gravitational potential energy of the toboggan at the top of the hill:
- Gravitational potential energy = mass * gravity * height
- Mass of the toboggan = 4.81 kg
- Gravity = 9.8 m/s^2 (approximate value)
- Height = 27.3 m
- Gravitational potential energy = 4.81 kg * 9.8 m/s^2 * 27.3 m
2. Calculate the work done by the child:
- The work done is equal to the change in gravitational potential energy.
- Since the toboggan is pulled at constant velocity, the work done is equal to the negative of the change in gravitational potential energy.
- Work done by the child = - (4.81 kg * 9.8 m/s^2 * 27.3 m)
(b) To repeat part (a) with a different angle, we need to recalculate the gravitational potential energy and work done.
1. Calculate the new height:
- Height = 27.3 m
2. Calculate the new work done:
- Work done by the child = - (4.81 kg * 9.8 m/s^2 * 27.3 m)
General conclusion:
When the vertical height remains the same, but the angle decreases, the work done by the child to pull the toboggan at constant velocity up the hill remains the same. This indicates that the angle of the incline does not affect the amount of work done in this scenario.
(c) When the child slides down the hill on the toboggan, both gravitational potential energy and kinetic energy are involved. The total work done on the child and toboggan during the slide can be calculated as the change in mechanical energy.
1. Calculate the initial gravitational potential energy at the top of the hill:
- Gravitational potential energy = mass * gravity * height
- Mass of the child and toboggan combined = 25.6 kg + 4.81 kg
- Height = 27.3 m
- Gravitational potential energy = (25.6 kg + 4.81 kg) * 9.8 m/s^2 * 27.3 m
2. Calculate the final kinetic energy at the bottom of the hill:
- Kinetic energy = 0.5 * mass * velocity^2
- Mass of the child and toboggan combined = 25.6 kg + 4.81 kg
- Velocity = calculated using the conservation of mechanical energy, assuming no energy losses due to friction or other factors
3. Calculate the total work done:
- Total work done = change in mechanical energy
- Change in mechanical energy = final kinetic energy - initial gravitational potential energy
Therefore, to determine the total work done on the child and toboggan during the slide, we need to calculate the initial gravitational potential energy and the final kinetic energy.
I hope this helps :)