A student investigated how length affects resistance of a wire. Figure 1 shows the circuit the student used.
The student took measurements using the meters X and Y.
Name meters X and Y. The table shows the results. For which length of wire are the readings of resistance most precise

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.

Which is not an example of how an object gains elastic potential energy by stretching? a. jumping on a pogo stick b. pulling on a rubber band c. jumping on a trampoline

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?