A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 58.8 m/s in 6.00 seconds. She then pulls the parachute cord and after a 4.00-second constant deceleration, descends at 10.0 m/s for 80.0 seconds, reaching the ground. From what height did the parachutist jump?
a. 914 m
c. 1520 m
b. 1110 m
d. 1750 m
B
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Equilibrium: In the figure, a 10-lb weight is suspended from two spring scales, each of which has negligible weight. Which one of the following statements about the readings in the scales is true?
A. Each scale will read 5 lb. B. The top scale will read zero, the lower scale will read 10 lb. C. The lower scale will read zero, the top scale will read 10 lb. D. Each scale will show a reading between one and 10 lb, such that the sum of the two is 10 lb. However, exact readings cannot be determined without more information. E. None of these is true.
If the speed of light were not absolute, the speed at which light from a star in a binary system came towards the Earth would depends on the star's
A) position and velocity B) distance C) masses D) sizes
An oxygen molecule has a moment of inertia of 5 × 10^?46 kg ? m2 . Calculate the bond length (in nm). Recall that the atomic mass of oxygen is 16 u (1 u = 1.66 × 10^?27 kg)
a. 0.3 b. 0.1 c. 0.2 d. 0.4 e. 0.5
It sure is bright everywhere; you've been able to travel around a bit, and it's clear that you are not in a star. Yet it is as bright as looking directly at the Sun
In your extensive travels through your current surroundings, you cannot find a single neutral atom anywhere, nor can you find a nucleus besides hydrogen or helium. And, while it is hot (a few thousand degrees Kelvin), it is nowhere near the temperature needed for nuclear fusion. Where are you? A) You are in the universe during its first 300,000 years. B) You are in the universe more than 10100 years in the future. C) You are in an accretion disk around a supermassive black hole. D) You are in the central regions of a quasar. E) You are where the Sun should be located, but about 5 billion years from now.