A 35.0-N crate is pulled up a 4.0-m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 25.0 N between the crate and the surface, what is the force applied by the worker?
a. zero
b. 3.95 N
c. 21.1 N
d. 46.1 N
e. 84.2 N
d
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A metal sample of mass M requires a power input P to just remain molten. When the heater is turned off, the metal solidifies in a time T. The specific latent heat of fusion of this metal is:
A. P/MT B. T /PM C. PM/T D. PMT E. P T /M
How many galaxies are needed to get a fair sample to determine what fraction are ellipticals?
A: 5-10. B: 35-45. C: 75-100. D: About 500. E: Over 1000.
Dripstone formations that form on cavern ceilings are called ______________
Fill in the blank(s) with correct word
By radiometric dating, the oldest mineral in a sedimentary rock was found to be 1.4 million years old. What is the age of the sedimentary rock?
A) 1.4 million years B) no older than 1.4 million years C) no younger than 1.4 million years D) Radiometric dating does not work for sedimentary rocks.