Answer:
Energy converted to heat and sound. Deformation of soil or ground may also take up some energy.
Explanation:
When the rock hits the ground, a part of the energy is converted to heat (thermal energy) and sound. If the ground is soft, it will be compressed by the rock when it lands. This deformation of the ground will take up some of the energy.
We can think of kinetic energy being transferred to the ground in the following way:
1. Ball hits the ground, and transfers kinetic energy to lots of soil particles.
2. Soil particles move a bit and transfer the energy to soil particles ahead of them.
3. Kinetic energy is transferred to a very large number of soil particles, and they move so little that we consider this vibration motion.
4. This small vibration motion is now considered as internal energy or 'heat'.
Answer:
Explanation:
The answer is in the picture
The speed is 16.2 m/s
Explanation:
Assuming the runner is moving by uniform motion (=at constant velocity), then we can find his speed by using the equation:
where
v is the speed
d is the distance covered
t is the time elapsed
For the runner in this problem, we have:
The initial position is 10 m while the final position is 80 metres, so the distance covered is
d = 80 - 10 = 70 m
While the time elapsed to cover these 70 m is
t = 4.32 s
Therefore, substituting into the equation, we find the speed:
Learn more about speed:
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True: a scientific fact is something that is absolute and unchanging.
Answer:
Resistance in pencil sharpener = 12 ohms
Explanation:
Given:
Voltage in pencil sharpener = 6 volts
Current in pencil sharpener = 0.5 amps
Find:
Resistance in pencil sharpener
Computation:
Resistance = Voltage / Current
Resistance in pencil sharpener = Voltage in pencil sharpener / Current in pencil sharpener
Resistance in pencil sharpener = 6 / 0.5
Resistance in pencil sharpener = 12 ohms