The point of this question is to compare rest energy and kinetic energy at low speeds. A baseball is moving at a speed of 12 m/s. Its mass is 145 grams (0.145 kg).
a. What is its rest energy?
b. Calculate its kinetic energy using the formula
c. What is its kinetic energy?
d. Which is true?
1. The kinetic energy is much bigger than the rest energy.
2. The kinetic energy is approximately equal to the rest energy.
3. The kinetic energy is much smaller than the rest energy.
Answer:
Erest = m×[tex]C^{2}[/tex]
= 0.145kg × 3×[tex]10^{8}[/tex]
= 1.305×[tex]10^{16}[/tex] J
b) finding the kinetic energy
Ek = 0.5×0.145×[tex]12^{2}[/tex]
= 1.044×[tex]10^{1}[/tex]J
c) the kinetic energy is smaller than rest energy
d) number 3 is true
Explanation: