Why is the sky blue?
A) The atmosphere reflects the color of the oceans.
B) The atmosphere reflects the light from the Sun.
C) The atmosphere scatters the light from the Sun.
D) The oceans refract the light from the Sun into the atmosphere.
E) The oceans reflect the light from the Sun into the atmosphere.
C
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A 95 N force exerted at the end of a torque wrench gives rise to a torque of 15 N ? m. What is the angle (assumed to be less than 90°) between the wrench handle and the direction of the applied force?
A) 18° B) 14° C) 22° D) 25°
Density waves may explain:
A) the lack of blue stars in the halo. B) the random orbits of halo stars. C) the density of red stars in the bulge. D) the spiral arm structure of the Galaxy. E) the large number of open clusters in the halo.
In the context of understanding stellar lives, "high-mass" stars have masses
A) more than about 8 times the mass of our Sun. B) more than about 3 times the mass of our Sun. C) more than twice the mass of our Sun. D) more than 20 times the mass of our Sun.
Force on a Moving Charge: A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude of the magnetic force acting on the proton? (e = 1.60 × 10-19 C)
A. 8.0 × 10-15 N B. 3.9 × 10-15 N C. 2.6 × 10-15 N D. 0 N E. 1.3 × 10-15 N