Blocks A and B of masses 14 kg and 15 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown
The horizontal surface is rough. The coefficients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B, as shown. In Figure 5.20, force Q equals zero. The force P, for which block B is on the verge of moving, is closest to:
A) 200 N
B) 540 N
C) 310 N
D) 1,200 N
E) 400 N
A
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Which of the following is not a possible energy source for a steam-electric generating plant?
A) fossil fuels B) wood C) solar energy D) fissionable material such as uranium E) All of the above are possible energy sources.
A 2.0-kg block slides on a frictionless 15° inclined plane. A force acting parallel to the incline is applied to the block. The acceleration of the block is 1.5 m/s2 down the incline. What is the applied force?
a. 8.1 N down the incline b. 3.0 N down the incline c. 2.1 N up the incline d. 3.0 N up the incline e. 8.1 N up the incline
Neutrinos travel at very high speeds (close to the speed of light). How does this fact imply that neutrinos cannot make up the bulk of the dark matter in galaxies?
A) Their high speeds mean neutrinos cannot have much mass. B) Their high speeds tell us that neutrinos interact only through the weak force and gravity. C) Their speeds of neutrinos mean that neutrinos would escape from galaxies.
Infall of ________ may explain the higher than expected star formation rates in galaxies
Fill in the blank(s) with correct word