According to the theory of general relativity, gravity is caused by the ____
a. linear motion of stars
b. change in mass of a moving body
c. curvature of space-time
d. constant speed of light
e. inertia of a moving body
c
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The following objects are found in a spiral arm of a galaxy. Which is the exception?
a. population II stars b. OB associations c. emission nebulae d. population I stars e. clouds of gas and dust
Conservation of Momentum: Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. How far has the heavier astronaut moved when the lighter astronaut has moved 12 m?
A. 16 m B. 9.0 m C. 21 m D. 7.0 m E. 12 m
A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The power factor, cos ?, is
A. ?1.00. B. ?0.936. C. +0.943. D. +0.936. E. +1.00.
Aerodynamic lift results from ________ Principle.
What will be an ideal response?