Light reflected off a plate-glass window (n = 1.5) is found to be completely polarized at angle-of-incidence ?. Find ?
a. 56.3°
b. 5.7°
c. 21.2°
d. 18.6°
e. 33.7°
a
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A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ b. ?0.29 kJ c. +30 J d. ?30 J e. ?50 J
If the dust around a protostar radiates most strongly at 30 microns or 30,000 nm, what is the approximate temperature of that dust? Hint: T in K =3,000,000/wavelength in nm
a. 100,000 K b. 10,000 K c. 1000 K d. 100 K e. 10 K
In general, the narrower the spectral line of a star:
A) the hotter the star is. B) the bigger the star is. C) the denser the star is. D) the smaller the star is. E) the cooler the star is.
An airplane flies horizontally with a speed of 300 m/s at an altitude of 400 m. Assume that the ground is level. At what horizontal distance from a target must the pilot release a bomb so as to hit the target?
A. 3.0 km B. 2.4 km C. 3.3 km D. 2.7 km E. 1.7 km