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Chapter 6: Q19P (page 277)
You push a crate3 m across the 铿俹or with aforce whose direction is below the horizontal. How much work do you do?
Work done after pushing the crate across the floor is 104 N m.
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Show the validity of the relation when , by making these substitutions:
Refer to figure 6.86. Calculate the change in electric energy along the two different paths in moving charge away from charge from A to B along a radial path, then to C along a circle centeredon , then to D along a radial path. Also calculate the change in energy in going directly from A to D along a circle centered at . Specifically. What are and their sum? What is ? Also, calculate the round-trip difference in the electrical energy when moving charge along the path from A to B to C to D to A.
Throw a ball straight up and catch it on the way down, at the same height. Taking into account air resistance, does the ball take longer to go up or to come down? Why?
A pitcher can throw a baseball at about (about). What is the ratio of the kinetic energy to the rest energy role="math" localid="1657706011431" ?
If a system contains four particles, how many potential energy pairs U12, etc., are there? List them.
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