The speed of a particle moving in a circle 2.0 m in radius increases at the constant rate of 4.4 m/s2 . At an instant when the magnitude of the total acceleration is 6.0 m/s2, what is the speed of the particle?
a. 3.9 m/s
b. 2.9 m/s
c. 3.5 m/s
d. 3.0 m/s
e. 1.4 m/s
b
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The density of air in the previous question would be __________ the density at the surface.
a. one-third b. one-half c. three times d. four times
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.
The presence of vesicular basalts among the lunar rock samples shows that
a. the lunar surface was fragmented by meteorite impacts. b. volcanism did not occur on the moon. c. the crust must have been made of anorthosite. d. molten lava once flowed over the lunar surface. e. the moon was once hit by a very large meteorite.
The largest nearby cluster of galaxies lies about 17 Mpc distant in
A) Sagittarius. B) Sculptor. C) Coma Bernices. D) Virgo. E) Ursa Major.