An engine is being used to raise a 89 kg crate vertically upward. If the power output of the engine is 1620 W, how long does it take the engine to lift the crate a vertical distance of 18.7 m? Friction in the system is negligible
What will be an ideal response?
10 seconds
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Light travels from inside a building to outside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case?
a. A 180o phase change occurs at the inside surface but not at the outside surface. b. A 180o phase change occurs at the outside surface but not at the inside surface. c. A 180o phase change occurs at both the inside surface and the outside surface. d. No phase change occurs at either the inside surface or the outside surface of the glass.
Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of ?80 pC/m2 . What is the magnitude of the electric field at any point not on either surface?
a. 1.1 N/C b. 5.6 N/C c. 7.9 N/C d. 3.8 N/C e. 4.0 N/C
A thin spherical shell of radius 20.0 cm has 5.0 ?C of charge uniformly distributed over its surface. What is the electric flux through an area of 1.00 m2 of a spherical surface concentric with the shell of charge but having a radius of 1.00 m?
a. 
b. 
c. 
d. 
e. 0
A football kicker is attempting a field goal from 44m out. The ball is kicked and just clears the lower bar with a time of flight of 2.9s If the angle of the kick was 45°, what was the initial speed of the ball, assuming no air resistance?
A) 39 m/s B) 2.2 m/s C) 21.5 m/s D) 19.7 m/s