In the late 1800s, Kelvin and Helmholtz suggested that the Sun stayed hot thanks to gravitational contraction. What was the major drawback of this idea?
A) It predicted that the Sun could last only about 25 million years, which is far less than the age of Earth.
B) It predicted that the Sun would shrink noticeably as we watched it, and the Sun appears to be stable in size.
C) It is physically impossible to generate heat simply by making a star shrink in size.
D) It predicted that Earth would also shrink, which would make it impossible to have stable geology on our planet.
E) It was proposed before Einstein's theory of general relativity and was therefore incorrect.
A
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Spherical Mirrors: An object that is 10.0 cm tall is placed 37.0 cm in front of a concave mirror of focal length 18.5 cm. How tall is the image?
A. 2.5 cm B. 5.0 cm C. 7.5 cm D. 20.0 cm E. 10.0 cm
According to the postulates of special relativity
A. the speed of light as measured by a stationary observer is the same as the speed of light measured by someone moving toward the light. B. Newton's laws do not apply for objects moving at high speeds. C. light can move faster when it moves with the luminiferous ether. D. it is impossible for an object to move faster than the medium it is moving through.
A ball is thrown vertically upwards at 24.5 m/s. For its complete trip (up and back down to the starting position), its average speed is a. 18.4 m/s. b. 12.3 m/s. c. 24.5 m/s. d. 6.1 m/s
e. not given.
Atmosphere pressure on mars is roughly half that of Earth's at sea level
Indicate whether the statement is true or false.