A player throws a football 50.0 m at 61.0° north of west. What is the westward component of the displacement of the football?
A) 64.7m
B) 55.0 m
C) 0.00 m
D) 74.0 m
E) 24.2 m
E
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Three individuals stand with all of their weight on the heel of one foot: a man of weight 600 N and a heel area of 100 cm2, a child of weight 200 N and a heel area of 25 cm2, and woman of weight 450 N and a heel area of 2 cm2. The one exerting the least pressure on the ground is
A. the child. B. the woman. C. the man. D. All of these choices exert the same
A massive star can fuse more and more massive nuclei, but this process is limited by the fact that, at some point, an element that is produced ____
a. becomes completely degenerate in the core, changing the pressure-temperature relationship b. cannot produce energy through fusion c. will only fuse in the presence of even more massive nuclei d. is not found in nature e. decays radioactively before it can undergo fusion
In 1974, astronomers sent an anticoded message as a string of 1679 _______________ and _______________
Fill in the blank(s) with correct word
What do we mean by gravitational time dilation?
A) It is the idea that time runs slower in places where gravity is stronger. B) It is the idea that clocks run slow for people moving at high speed past you. C) It is the idea that everyone measures time differently, depending on his or her reference frame. D) It is the idea that clocks run faster in stronger gravitational fields.