An airplane travels 80 m/s as it makes a horizontal circular turn which has a 0.80-km radius. What is the magnitude of the resultant force on the 75-kg pilot of this airplane?
a. 0.69 kN
b. 0.63 kN
c. 0.66 kN
d. 0.60 kN
e. 0.57 kN
d
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A silicon monoxide (n = 1.45) film of 322-nm thickness is used to coat a glass camera lens (n = 1.56). What wavelength of light in the visible region (390 to 710 nm) will be most efficiently transmitted by this system? (1 nm = 10?9 m)
a. 467 nm b. 498 nm c. 623 nm d. 527 nm e. 736 nm
Radioactivity Basics: The nuclei of 
He are also known as
A. ? particles. B. ? particles. C. ? rays. D. x-rays. E. positrons.
The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 2, when it is undergoing convective contraction, and its life track moves almost straight down on the HR diagram?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
Two long parallel wires are separated by 4.0 cm. One of the wires carries a current of 20 A and the other carries a 30-A current. Determine the magnitude of the magnetic force on a 2.0-m length of the wire carrying the greater current
a. 7.0 mN b. 6.0 mN c. 8.0 mN d. 9.0 mN e. 4.0 mN