You and your friends sit at opposite ends in the back of a pickup traveling north at 60 mph. Your friend, at the front of the pickup bed, throws a ball to you with a speed of 4 mph. An observer on the ground perceives the ball traveling with a velocity
A. 4 mph north.
B. 4 mph south.
C. 64 mph north.
D. 56 mph north.
E. 56 mph south.
D. 56 mph north.
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Dielectrics: A dielectric material such as paper is inserted between the plates of a capacitor as the capacitor holds a fixed charge on its plates. What happens to the electric field between the plates as the dielectric is inserted?
A. There is no change in the field. B. The field becomes stronger. C. The field becomes weaker. D. The field reduces to zero.
The number of photons per second passing a plane perpendicular to a collimated monochromatic (one frequency) beam of light transporting power P is directly proportional to
a. the wavelength of the light. b. the frequency of the light. c. the power of the beam. d. all of the above. e. only (a) and (c) above.
A potential energy function for a certain system is given by U1(x) = Cx2 + Bx3. The potential energy function for a second system is given by U2(x) = A + Cx2 + Bx3, where A is a positive quantity
If an object begins at the same initial position with the same initial velocity in both systems, how is the motion in the two systems related? A) The motion in the first system will be with greater speed than in the second system because of the lower potential energy. B) The motion in the second system will be at greater speeds in one direction and lower speeds in the other direction relative to the first system. C) The motion in the two systems is identical. D) The motion in the second system will be with greater speed than in the first system because of the greater potential energy. E) The motion in the two systems will be in opposite directions.
Discuss what happens during the testing phase of a website.
What will be an ideal response?