An AC voltage source has an amplitude of 96. V and frequency 400. Hz. The voltage was zero at t = 0 and was increasing
(a) What is the effective rms voltage?
(b) What is the instantaneous voltage at 1.00 ms?
(c) When will the voltage be 40. V?
(a) 68. V
(b) 56. V
(c) 0.17 ms
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Free Fall: An astronaut stands by the rim of a crater on the Moon, where the acceleration of gravity is 1.62 m/s2 and there is no air. To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom. If the time is 6.3 s, what is the depth of the crater?
A. 10 m B. 14 m C. 26 m D. 32 m E. 38 m
An electron and a positron, both essentially at rest, annihilate each other, emitting two identical photons in the process. What is the wavelength of these photons?
The mass of an electron or positron is 9.11 × 10-31 kg. (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s) A) 1.21 × 10-12 pm B) 1.73 pm C) 2.42 pm D) 3.07 pm E) 3.46 pm
Kepler’s Third Law relates
• •(a) density and pressure •(b) period and semi-major axis •(c) semi-major axis and orbital velocity •(d) period and orbital velocity
Two balls, projected at different times so they don't collide, have trajectories A and B, as shown below
Which statement is correct?
a.
v0B must be greater than v0A.
b.
Ball A is in the air for a longer time than ball B.
c.
Ball B is in the air for a longer time than ball A.
d.
Ball B has a greater acceleration than ball A.
e.
Ball A has a greater acceleration than ball B.