Electrons interact with each other by exchanging:
a. gluons.
b. photons.
c. neutrinos.
d. nucleons.
e. charges.
b
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A 2.50-kg projectile is launched at an angle of 20.0° above the horizontal with an initial speed of 100 m/s from the top of a building 40 m high. If the projectile is traveling 85.0 m/s at its maximum height of 47.0 m, how much work has been done on the projectile by air friction?
a. –3.3E+3 J b. 1.7E+2 J c. –3.5E+3 J d. 2.4E+4 J
A very long nonconducting cylinder of diameter 10.0 cm carries charge distributed uniformly over its surface. Each meter of length carries +5.50 µC of charge
A proton is released from rest just outside the surface. How far will it be from the SURFACE of the cylinder when its speed has reached 2550 km/s? (k = 1/4??0 = 8.99 × 109 N ? m2/C2, e = 1.60 × 10-19 C, mproton = 1.67 x 10-27 kg)
In the picture shown, which label is the asterism, constellation, and star?
a. Little Dipper is the constellation, no asterism is labeled, and Polaris is the star.
b. Big Dipper is the asterism, no star is labeled, and Polaris is the constellation.
c. Polaris is the star, Little Dipper is the asterism, and no constellation is labeled.
d. No star or asterism is labeled but Big Dipper is the constellation name.
If a source of light is approaching us at 3,000 km/sec, then all its waves are
A) redshifted by 1%. B) not affected, as c is constant regardless of the direction of motion. C) blueshifted out of the visible spectrum into the ultraviolet. D) blueshifted by 1%. E) redshifted out of the visible into the infrared.