A thin metallic spherical shell of radius 50 cm has a total charge of 4.0 ?C placed on it. At the center of the shell is placed a point charge of 2.00 ?C. What is the electric field at a distance of 90 cm from the center of the spherical shell?
a. 
b. 
c. 
d. 
e. 
c.
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The high temperature of the corona is directly responsible for
A) prominences. B) flares. C) the solar wind. D) aurora. E) sunspots.
If a body's acceleration is doubled then the amount of force acting on the body had to _______
a. double b. halve c. stay the same d. None of the other choices are correct.
Experienced players can throw a Frisbee so it skips off the ground (the Frisbee’s front edge actually tips upward after the Frisbee hits, enabling it to climb back into the air). If a right-handed player throws a Frisbee in the usual way, it rotates counterclockwise when viewed from above. To skip the Frisbee, which edge has to hit the ground (as seen by the thrower)? (Hint: The Frisbee’s angular momentum vector, and thus its rotation axis, changes in the direction of the external torque that the strike applies to the Frisbee.)
A. The back edge B. The front edge C. The right edge D. The left edge E. The entire rim must hit the ground simultaneously.
How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
A. 0.22 kJ B. 0.20 kJ C. 0.24 kJ D. 0.27 kJ E. 0.31 kJ