You and a classmate are discussing how much work one must do to lift a box of mass m a vertical distance h. Your classmate argues, “You have to exert an upward force on the box at least equal in magnitude to the box’s weight 
, and you lift the box upward a distance h, so you must do work equal to 
. But in addition,” your classmate continues, “ you must increase the box’s gravitational potential energy by 
21_02_20-C12_clicker [Compatibility Mode] - Microsoft PowerPoint.png" class="w-image" /> . Therefore, you must actually do work equal to or greater than 
to lift the box.” What amount of work do you think you need to do on the box to lift it a height h? Be prepared to defend your response. (Hint: What is the system here?)
A. Zero work
B. About 
(if you move the box slowly)
C. Significantly greater than 
but less than 
D. About 
(if you move the box slowly)
E. Significantly greater than 
B. About (if you move the box slowly)
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Gentle tidal interactions are probably necessary to support the formation of _______________ in a galaxy
Fill in the blank(s) with correct word
In projectile motion the horizontal component of the velocity at the top of the trajectory is
A. non-zero, and less than the initial horizontal component of the velocity. B. non-zero, and equal to the initial horizontal component of the velocity C. zero D. non-zero, and greater than the initial horizontal component of the velocity
Eight little spheres of mercury coalesce to form a single sphere. Compared to the combined surface areas of the eight little spheres, the surface area of the big sphere is
A) less. B) the same. C) greater.
A satellite is placed in a geosynchronous orbit. In this equatorial orbit with a period of 24 hours, the satellite hovers over one point on the equator. Which statement is true for a satellite in such an orbit?
a. There is no gravitational force on the satellite. b. There is no acceleration toward the center of the Earth. c. The satellite is in a state of free fall toward the Earth. d. There is a tangential force that helps the satellite keep up with the rotation of the Earth. e. The force toward the center of the Earth is balanced by a force away from the center of the Earth.