Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it really is. Assume a cylindrical bottle with an inner radius of 1.0 cm and an outer radius of 2.0 cm. What percentage of the apparent volume is the real volume?
a. 95%
b. 60%
c. 80%
d. 64%
e. 75%
D
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A golf ball of mass 0.050 kg is at rest on the tee. Just after being struck, it has a velocity of 102 m/s. If the club and ball were in contact for what is the average force exerted on the ball by the club?
A) 6.3 kN B) 7.1 kN C) 5.5 kN D) 4.9 kN
You make a roundtrip to a star located 1000 light-years away (so the roundtrip distance is 2000 light-years in Earth's reference frame) at an average speed of 0.99c. Based on the time dilation formula below, about how long will the trip take, according to you?
t' = t A) 2.8 years B) 10 years C) 28 years D) 280 years E) 2000 years
The Heisenberg uncertainty principle places restriction on the precision of simultaneously measuring both position and momentum. This principle can also be applied to the simultaneous measurement of two other variables, which are
a. force and color. b. energy and time interval. c. mass and charge. d. torque and frequency.
If the photons from blackbody radiator radiation pass through a cool gas, a(n) ____ spectrum is produced
a. absorption b. emission c. continuous d. Doppler e. ionization