A box is pushed across a rough horizontal floor by a force acting parallel to the floor in the direction of motion. A force providing no impulse during the motion is
A. friction.
B. the applied force.
C. gravity.
D. None of these choices are correct
Answer: D
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For someone in the Northern Hemisphere stars rise in the east and set in the west. For someone in the Southern Hemisphere
A. the opposite is true-stars rise in the west and set in the east. B. the situation is the same-stars also rise in the east and set in the west.
How was the first asteroid discovered?
A. Newton inferred their existence by their gravitational influence on Jupiter. B. Kepler traced back the path of meteors to the Asteroid belt. C. Galileo saw it whiz by Jupiter. D. It collided with the Moon. E. Piazzi found it by searching for objects at the distance suggested by Bode's law.
What evidence suggests that life arises relatively easily?
A) Life was present on Earth soon after the end of the heavy bombardment. B) Life is currently present in extreme environments like deep ocean volcanic vents. C) All organisms on Earth use DNA as their genetic material. D) Tardigrades, small animals, can survive exposure to the near-vacuum of space.
A 30-cm steel rod, 1.0 cm in diameter, supports a 300-kg mass. What is the change in length of the rod? Young's modulus for steel is 20 × 1010 N/m2
A) 5.6 × 10-5 m B) 6.5 × 10-5 m C) 5.6 × 10-6 m D) 6.5 × 10-6 m E) 6.5 × 10-4 m