If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed?
a. Both would be earlier.
b. Both would be later.
c. Sunrise would be earlier and sunset later.
d. Sunrise would be later and sunset earlier.
D
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If there is a net torque on a wheel, then
A. the wheel cannot be spinning. B. the angular momentum of the wheel cannot change direction. C. there must be a net force on the wheel. D. the wheel must have a nonzero angular acceleration.
Poke a pinhole in a piece of card and hold it in sunlight and an image of the Sun is cast on the floor. The Sun-image diameter depends on the height of the pinhole above the floor
Measurements for all heights show the Sun-image diameter is about 1/100 the distance between the pinhole and the floor. This means that A) about 100 end-to-end Sun images would fit between the pinhole and the floor. B) distance-wise, the Sun is about 100 Suns away from Earth. C) both of these D) none of the above
An alpha particle is a nucleus of helium. It has twice the charge and four times the mass of the proton. When they were very far away from each other,
but headed toward directly each other, a proton and an alpha particle each had an initial speed of 0.0030c, where c is the speed of light. What is their distance of closest approach? Hint: There are two conserved quantities. Make use of both of them. (c = 3.00 × 108 m/s, k = 1/4??0 = 8.99 × 109 N ? m2/C2, e = 1.60 × 10-19 C, mproton = 1.67 x 10-27 kg) A) 3.3 × 10-13 m B) 2.6 × 10-13 m C) 2.1 × 10-13 m D) 2.9 × 10-13 m
The oldest fossil records date back about
a) 100 years. b) 6 thousand years. c) 2 million years. d) 3500 million years.