A 2.0-kg block slides down a plane (inclined at 40° with the horizontal) at a constant speed of 5.0 m/s. At what rate is the gravitational force on the block doing work?
a. +98 W
b. +63 W
c. zero
d. +75 W
e. -75 W
B
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Which kind of telescope and which instrument or technique are shown?
a. optical, CCD
b. infrared, array detector
c. optical, adaptive optics
d. radio, interferometry
A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 37.0° above the horizontal. The mass of the box and the books is 40.0 kg. (a) Draw the free-body diagram for the box
(b) Calculate the acceleration of the box. (c) Calculate the normal force acting on the box.
Quasars are isolated supermassive black holes, and not associated with galaxies
a. True b. False Indicate whether the statement is true or false
If sunlight of color B is scattered through an angle 16 times greater than sunlight of color A, then the wavelength of color B is
A) twice that of color A. B) 1/2 that of color A. C) 16 times that of color A. D) 1/16 that of color A. E) 1/4 that of color A.