A bullet moving at 244. m/s strikes a tree and penetrates a distance of 8.34 mm before stopping. What was the average acceleration of the bullet as it slowed?
What will be an ideal response?
-3.57 × 106 m/s
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Until we sent missions to the Moon, no one on Earth had seen the far side of the Moon.
Answer the following statement true (T) or false (F)
Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A:
A. it has the same position and the same velocity as A. B. it has the same position and the same acceleration as A. C. it has the same velocity and the same acceleration as A. D. it has the same displacement and the same velocity as A. E. it has the same position, displacement and velocity as A.
Two equal-magnitude forces are applied to a door at the doorknob. The first force is applied perpendicular to the door, and the second force is applied at 30° to the plane of the door. Which force exerts the greater torque about the door hinge?
A) the first force (applied perpendicular to the door) B) the second force (applied at an angle) C) Both forces exert equal non-zero torques. D) Both forces exert zero torque.
About how much mass does our galaxy contain?
A. 1 billion solar masses B. 1020 solar masses C. 1 million solar masses D. 1011 solar masses