A motorcycle daredevil wants to ride up a 50.0 m ramp set at a 30.0° incline to the ground. It will launch him in the air and he wants to come down so he just misses the last of a number of 1.00 m diameter barrels. If the speed at the instant when he leaves the ramp is 60.0 m/s, how many barrels can be used?
a. 79
b. 318
c. 332
d. 355
e. 402
D
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Coulomb's Law: Two electrons are 20.0 mm apart at closest approach. What is the magnitude of the maximum electric force that they exert on each other? (e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 109 N ? m2/C2)
A. 5.8 × 10-25 N B. 2.3 × 1010 N C. 2.3 N D. 5.8 × 10-27 N
A 975-kg sports car (including driver) crosses the rounded top of a hill (raduis=88.0m) at 12.0 m s. Determine
(a) the normal force exerted by the road on the car, (b) the normal force exerted by the car on the 72.0-kg driver, and (c) the car speed at which the normal force on the driver equals zero.
The process occurring when photons bounce off a polished surface is called:
A) diffraction. B) refraction. C) reflection. D) dispersion. E) interference.
Polarized light is to have its polarization plane rotated by 90°. In which of the following cases does the final beam have the greatest intensity?
a. 3 polarizing filters, each rotate beam by 30°. b. 2 polarizing filters, both rotate beam by 45°. c. 1 polarizing filter, rotating beam by 90°. d. None of the above, polarized light can't be rotated.