The electron gun in a television tube accelerates electrons (mass = 9.11 × 10^?31 kg, charge = 1.60 × 10^?19 C) from rest to 3.00 × 10^7 m/s within a distance of 2.00 cm. What electric field is required?
128 000 N/C
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The moment of inertia of a uniform rod (about its center) is given by I = ML2/12. What is the kinetic energy of a 120-cm rod with a mass of 450 g rotating about its center at 3.60 rad/s?
A) 0.350 J B) 4.20 J C) 0.700 J D) 0.960 J E) 2.10 J
The graph in the figure shows the x component of the acceleration of a 2.4-kg object as a function of time (in ms)
(a) At what time(s) does the x component of the net force on the object reach its maximum magnitude, and what is that maximum magnitude? (b) What is the x component of the net force on the object at time t = 0.0 ms and at t = 4.0 ms? What will be an ideal response?
In order for two objects to have the same temperature, they must
a. be in thermal equilibrium. b. be in thermal contact with each other. c. have the same relative "hotness" or "coldness" when touched. d. have all of the properties listed above. e. have only properties (b) and (c) above.
Two pulses are traveling towards each other at 10 cm/s on a long string at t = 0 s, as shown below.
Which diagram below correctly shows the shape of the string at 0.5 s?
A.
B.
C.
D.
E.
