The acceleration of a rocket increases as it travels upward from the ground mainly because
A) gravity becomes weaker with increased distance.
B) the applied force on the rocket increases as fuel is burned.
C) the mass of the rocket decreases as fuel is burned.
Answer: C
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The equation below is the solution to a problem.
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The best physical representation of this equation is
A. a sphere of 2.00-kg mass under a 45.2-N tension when at the bottom of a vertical circle. B. a sphere of 2.00-kg mass under a 45.2-N tension when at the side of a vertical circle. C. a sphere of 2.00-kg mass under a 45.2-N tension when at the top of a vertical circle. D. a sphere of 2.00-kg mass at any point on a horizontal circle. E. a 2.00-kg gecko running on the ceiling with a speed of 8.00 m/s.
A satellite, initially at rest in deep space, separates into two pieces, which move away from each other
One piece has a rest mass of 190 kg and moves away with a speed 0.280c, and the second piece moves in the opposite direction with a speed 0.600c. What is the rest mass of the second piece? A) 88.7 kg B) 79.6 kg C) 73.9 kg D) 68.8 kg E) 52.7 kg
The preferred name for N2O (commonly called nitrous oxide) is
a. nitrogen(II) oxide. b. nitric acid. c. nitric oxide. d. dinitrogen oxide.
Work
a)can be measured in watts. b)has the units of force x time. c)is a vector quantity. d)has the units of N-m.