Answer:
7. A
8. C
9. C
10. A
11. A
Explanation:
7. How much G.P.E. does a 5 kg rock that is 8 m above the ground has?
Given:
m = 5kg
h = 8m
g = 9.81 m/s² (acceleration due gravity)
Unknown:
PEg or gravitational potential energy
Formula and Solution:
PEg = mgh
PEg = (5kg)(9.81 m/s²)(8m)
Final Answer:
PEg = 392.4 kgm²/s² or simplify as 392.4 J rounding off will be equal to 392 J
8. Kinetic energy is the energy of
C. Objects in motion
Explanation:
<em>All moving things have kinetic energy. It is the energy possessed by an object due to its motion or movement.</em>
9.Kinetic energy of an object is directly proportional to the square of its speed
. therefore,
C. KE and speed are the same always.
Explanation:
<em>The heavier a thing is, and the faster it moves, the more kinetic energy it has. So always the same faster moves, more kinetic energy</em>
10. An object's kinetic energy remains constant if
A. an object remains the same size and continues to move at the same speed
Explanation:
<em>The heavier a thing is, and the faster it moves, the more kinetic energy it has. </em>
11. What happens to the kinetic energy of a moving object as the mass remains the same, but the velocity increases?
A. Kinetic energy increases
Explanation:
<em>The heavier a thing is, and the faster it moves, the more kinetic energy it has. So if the velocity or speed increases the kinetic energy also increases</em>
<em>Hope it was very helpful to you and others. Thank you - By Answer045</em>