An auto is moving at a steady 50 mph up a long straight [constant "slope"] incline. While it is on this incline,
A) its acceleration is zero but its velocity is not zero.
B) its velocity and acceleration are both zero.
C) its velocity is zero but its acceleration is not zero [i.e., it does have an acceleration].
D) neither its velocity nor its acceleration are zero.
E) it has the heebie-jeebies.
A
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An electron with a speed of 2.0 × 10^6 m/s moves into a uniform electric field of 325 N/C that is parallel to the electron's motion. How long does it take to bring the electron to rest? (me = 9.11 × 10^-31 kg, e = 1.6 × 10^-19 C)
a. 3.5 × 10^-8 s c. 2.3 × 10^-8 s b. 2.3 × 10^-6 s d. 1.2 × 10^-7 s
What is the name of constellations that appear to never rise or set?
a. polar constellations b. circumference constellations c. circular constellations d. celestial polar constellations e. circumpolar constellations
As a rotating gas cloud contracts, it spins faster
Indicate whether the statement is true or false
An 800-kHz sinusoidal radio signal is detected at a point 2.1 km distant from a transmitter tower
The electric field amplitude of the signal at that point is 0.80 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the intensity of the radio signal at that point? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s) A) 4.2 × 10-4 W/m2 B) 1.7 × 10-3 W/m2 C) 8.5 × 10-4 W/m2 D) 1.2 × 10-3 W/m2 E) 6.0 × 10-4 W/m2