A particle (mass = 4.0 g, charge = 80 mC) moves in a region of space where the electric field is uniform and is given by Ex = -2.5 N/C, Ey = Ez = 0 . If the velocity of the particle at t = 0 is given by vx = 80 m/s, vy = vz = 0, what is the speed of the particle at t = 2.0 s?
a. 40 m/s
b. 20 m/s
c. 60 m/s
d. 80 m/s
e. 180 m/s
B
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A particle is moving with a constant acceleration of 4.0 m/s2 . Its speed at t = 1.0 s is 4.0 m/s and at t = 3.0 s it is 12.0 m/s. What is the area under the position-time graph for the interval from t = 1.0 s to t = 3.0 s?
a. 8.0 m/s b. 8.0 m c. 12 m d. 16 m e. 16 m/s2
A particle (m = 2.0 mg, q = -5.0 mC) has a speed of 30 m/s at point A and moves (with only electric forces acting on it) to point B where its speed is 80 m/s. Determine the electric potential difference VA - VB
a. -2.2 kV b. +1.1 kV c. -1.1 kV d. +2.2 kV e. +1.3 kV
Heat is energy that is transferred between objects that are in thermal contact because of a temperature difference
Indicate whether the statement is true or false
We know that there are large gaps in the average distances of asteroids from the Sun (within the asteroid belt) because we
A) see the gaps through telescopes. B) see the gaps via stellar occultation. C) know they are there theoretically, although we haven't detected them. D) actually don't know whether there really are gaps or not. E) have plotted distributions of the orbital radii of the asteroids.