Imagine that we have two identical metal spheres on insulating stands that we give the same negative charge. If we slowly bring the spheres closer and closer together, the charge per unit area ? on each sphere will at the point nearest the other sphere
A. become increasingly negative.
B. become less negative.
C. remain constant.
B. become less negative.
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An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field. b. Sonya, because the electron moves opposite to the direction of the field. c. Joanna, because the electron moves in the direction of the field. d. Sonya, because the electron moves in the direction of the field. e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.
What are the advantages in placing the James Webb Space Telescope so far from Earth? Choose all that apply.
A.It will be closer to the objects it seeks to observe. B.There will not be any atmospheric interference. C.Light from the objects it observes will arrive at the telescope more quickly. D.Only a small portion of the sky will be blocked by Earth. E.It is unlikely to be hit by orbiting debris.
How might two colliding spiral galaxies tend to create an elliptical galaxy?
A) The orbits of the stars get randomized during the collision, while their gas disks collide and form stars. B) The collision creates a larger galaxy and elliptical galaxies are always larger. C) The gas in the disks of the galaxies is expelled into intergalactic space by gravitational interactions. D) The heat created by collisions between stars causes the disks to puff out into a spherical shape.
Rotational Dynamics: A cinder block of mass m = 4.0 kg is hung from a nylon string that is wrapped around a frictionless pulley having the shape of a cylindrical shell, as shown in the figure. If the cinder block accelerates downward at 4.90 m/s2 when it is released, what is the mass M of the pulley?
A. 2.0 kg B. 4.0 kg C. 6.0 kg D. 8.0 kg E. 10 kg