What evidence from the careful examination of impact craters provides evidence that Mars had surface water long ago?
A) indistinct rims of many large craters due to water erosion
B) lack of small craters which would have been erased by ancient rainfall
C) channels where water once flowed between crater lakes
D) all of these
D
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If one of the intrinsically brightest stars in our sky were 10pc away from Earth, it would appear:
A) more than 10 times as bright as Earth at its brightest. B) more than 25 times as bright as Venus at its brightest. C) more than 10 times as bright as Venus at its brightest. D) more than 25 times as bright as Earth at its brightest.
A single-slit experiment uses light of wavelength 720. nm with a slit separation of 0.250 mm and a screen placed 2.7 m away
(a) What is the angular width of the central fringe? (b) What is the linear width of the central fringe on the screen? (c) What is the linear distance on the screen between the central maximum and the 1st order maximum?
How much heat is released when 30 g of water at 96°C cools to 25°C? The specific heat of water is 1 cal/g°C.
The fluid to which Bernoulli's equation is applied is based on what being conserved for the fluid?
a. its momentum b. its potential energy c. its kinetic energy d. its total mechanical energy