Two marbles, one of which is more massive than the other, are held at the same height above the ground. At the same time, the less massive marble is fired purely horizontal direction (like a bullet); the heavier marble is simply dropped. What happens (from below), and why? Neglect air resistance.
What will be an ideal response?
Answer: Both marbles hit the ground at the same time; gravity accelerates all masses equally.
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A rectangular box of negligible mass measures 5.0 m long, 1.0 m wide, and 0.50 m high. How many kilograms of mass can be loaded onto the box before it sinks in a lake having water of density 1000 kg/m3?
A) 1.5 × 103 kg B) 2.5 × 103 kg C) 0.50 × 103 kg D) 3.5 × 103 kg
An ion is released from rest and moves due to the force from an electric field from a position in the field having a potential of 14 V to a position having a potential of 8 V. The ion:
a. must have a positive charge. b. must have a negative charge. c. can have either a positive or a negative charge. d. must be neutral.
The restoring force of a spring is proportional to the displacement of the object at the end.
Indicate whether the statement is true or false.