State the principle of conservation of mechanical energy
What will be an ideal response?
If only conservative forces are doing work, the total mechanical energy of a system neither increases nor decreases in any process. It stays constant - it is conserved.
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a type of star cluster that contains mostly very old stars is
What will be an ideal response?
According to modern science, approximately how old is the Sun?
A) 4 1/2 billion years B) 25 million years C) 10,000 years D) 400 million years
Simple Pendulum: An astronaut has landed on Planet N-40 and conducts an experiment to determine the acceleration due to gravity on that planet. She uses a simple pendulum that is 0.640 m long and measures that 10 complete oscillations 26.0 s. What is the acceleration of gravity on Planet N-40?
A. 4.85 m/s2 B. 1.66 m/s2 C. 3.74 m/s2 D. 2.39 m/s2 E. 9.81 m/s2
If you pound a feather with a hammer, on which one is a greater force exerted?
A) always the feather B) always the hammer C) The magnitude of the force is always exactly the same on both of them. D) If the feather moves, then the greater force was exerted on it. Otherwise forces of the same magnitude were exerted on both.