A roller skate at rest may have
A) speed.
B) velocity.
C) momentum.
D) energy.
Answer: D
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Equilibrium: A store's sign has a mass of 20 kg and is 3.0 m long. It is uniform, so its center of gravity is at the center of the sign. It is supported horizontally by a small loose bolt attached to the wall at one end and by a wire at the other end, as shown in the figure. What is the tension in the wire?
A. 460 N B. 230 N C. 120 N D. 200 N E. 300 N
What information does a star's Greek-letter designation convey?
What will be an ideal response?
Which of the following statements about Pluto is not true?
A) It has more in common with comets in the Kuiper belt than it does with the jovian planets. B) It is orbited by at least three moons. C) Its mass is less than 1% of Earth's mass. D) It is the largest known object that is considered to be a dwarf planet.
Consider a situation where two moving objects collide and rebound from each other.Linear momentum is definitely conserved
a. True b. False Indicate whether the statement is true or false