A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The ball is referred to at the two-second time. The distance below the rooftop is __________
Fill in the blank(s) with correct word
19.6 m
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There is a main-sequence mass-luminosity relation because
a. helium fusion produces carbon. b. stars expand when they become giants. c. more massive stars support their larger weight by making more energy. d. the helium flash occurs in degenerate matter. e. all stars on the main sequence have about the same radius.
Answer the following statement(s) true (T) or false (F)
1. In example C4.2, if we had modeled the atoms as solid spheres instead of modeling the nuclei as point-like particles, we would have gotten the same result for the system’s center of mass
Our Sun is considered to be a(n) ________
A) brown dwarf B) low-mass star C) high-mass star D) intermediate-mass star
The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes an angle with the ground. When a force of magnitude F is applied to each box in a direction parallel to the surface it is on, upwards on the box on the ramp, neither box moves. Which statement comparing the friction force on the box on the level, Fs,L, to the friction force on the
box on the ramp, Fs,R, is correct?
a. Fs,R = Fs,L.
b. Fs,R > Fs,L.
c. Fs,R