You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must have been equal
A) True B) False
B
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During the T-Tauri phase of a protostar, it
A) begins a period of reduced activity. B) expands dramatically. C) may develop very strong winds. D) lies on the main sequence. E) changes its spin direction.
When stars are moving away from us the color of their light is shifted toward the ______ (red or blue) end of the light spectrum because the wavelegth is ________ (shorter or longer).
a. red; longer b. red; shorter c. blue; longer d. blue; shorter
A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block giving rise to an acceleration of 3.0 m/s2
(a) Determine the mass of the block. (b) Calculate the distance the block will travel if the force is applied for 10 s. (c) Calculate the speed of the block after the force has been applied for 10 s.
A body of mass 5.0 kg is suspended by a spring which stretches 10 cm when the mass is attached. It is then displaced downward an additional 5.0 cm and released. Its position as a function of time is approximately
a. y = ?0.10 sin 9.9t b. y = 0.10 cos 9.9t c. y = ?0.10 cos (9.9t + .1) d. y = 0.10 sin (9.9t + 5) e. y = ?0.05 cos 9.9t