An electron traveling due north with speed 4.0 × 105 m/s enters a region where the Earth's magnetic field has the magnitude 5.0 × 10-5 T and is directed downward at 45° below horizontal. What force acts on the electron?
A)
2.3 × 10-18 N
B)
3.2 × 10-18 N
C)
2.3 × 10-19 N
D)
3.2 × 10-19 N
E)
2.3 × 10-20 N
A
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In a solar hot-water system, the hot-water tank is maintained at 130°C. It is desired to have the solar heater heat the feed water going into the tank to 180°C. Determine the amount of heat per kilogram of water required from the solar heater to heat the water from 130°C to 180°C. Assume that the hot-water heater runs at constant pressure.
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Relative Velocity: A plane has an airspeed of 200 m/s northward, and is in a wind of 50.0 m/s to the west. The plane's speed relative to the ground is
A. 150 m/s. B. 200 m/s. C. 206 m/s. D. 250 m/s.
Contrast observation of ionized and neutral hydrogen in space
What will be an ideal response?
Two masses collide and stick together. Before the collision one of the masses was at rest. Is there a situation in which the kinetic energy is conserved in such a collision?
a. Yes, if the less massive particle is the one initially at rest. b. Yes, if the more massive particle is the one initially at rest. c. Yes, if the two particles have the same mass. d. No, kinetic energy is always lost is such a collision.