Consider a 1000. Gauss magnetic field along the z axis and a proton moving with an instantaneous velocity of = 3 + 4 km/s (note its speed is 5. km/s composed of 3. km/s along the x axis and 4. km/s along the z axis)
Determine the radius of its spiraling orbit. [proton: 1.67 × 10-27 kg and 1.6 × 10-19 Coulomb]
0.3 mm radius
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Spring tides occur when the Moon is in
a) new phase. b) waxing gibbous phase. c) first-quarter phase. d) waning gibbous phase.
Due to inertia, perhaps a railroad train in motion should continue moving indefinitely when its engine is turned off. This is not observed because railroad trains
A) aren't massive enough. B) are too heavy. C) ride on straight tracks. D) encounter opposing forces.
A series circuit consists of a 0.55-H inductor with internal resistance of 8.0 ? connected in series with a 4.0-? resistor, an open switch, and an ideal 12-V battery
(a) When the switch is closed, what is the initial current through the 4.0-? resistor? (b) What is the current through the 4.0-? resistor a very long time after the switch is closed?
A solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 3.5 rad/s. What is its kinetic energy?
A) 0.18 J B) 0.092 J C) 0.96 J D) 1.05 J E) 0.53 J