It is generally easier to push an object once it is moving than when you are getting it started. This is because
a. sliding friction is zero.
b. sliding friction is less than static friction.
c. static friction is less than sliding friction.
d. static friction is zero.
b
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A white dwarf that exceeds the Chandresekhar limit ____
a. will collapse to form a neutron star b. will explode as a nova, and may repeat the cycle over time c. is completely destroyed by carbon deflagration d. breaks apart and forms an excretion disk e. becomes a degenerate object
Which of the following worlds has the most substantial atmosphere?
A) Mercury B) Venus C) the Moon D) Mars E) Earth
Unpolarized light of intensity I0 passes through two sheets of ideal polarizing material. If the transmitted intensity is 0.24 I0, what is the angle between the polarizer and the analyzer?
a. 61° b. 46° c. 61° d. 76° e. 0.81°
Suggest why people once washed their hands with ashes
A) The ashes act as a base and reacts with skin oils to produce solutions of soap. B) The ashes act as an acid and reacts with the skin oils to produce soap. C) The oils on the skin act as a base and reacts with the ashes to produce soap. D) After being burnt in the fire, the acids and bases of the log are neutralized, making it a gentle material to use on the hands.