A tractor pulls on a tree for 3 minutes with a force of 100 pounds. The tree does not move. How much work is done?

1000 ft-lbs

3000 ft-lbs

unknown

zero

How does skaters kinetic energy change as he moves down the ramp

What is the definition of displacement

Two resistors, A and B, are connected in parallel across a 8.0 V battery. The current through B is found to be 3.0 A. When the two resistors are connected in series to the 8.

Electric powerlines in electric Post hang very low in hot summer? Why?

Which term describes a political institution that rules over a group of people with the same language and culture who reside within a defined territory? A. nation B. nation-state C. state D. political territory

As part of his meal, a workman has a cup containing a hot drink. In order to keep the drink hot whilst he eats the rest of his meal, he covers the cup, as shown in the figure. Which sources of energy loss does this action reduce? Tick two boxes.

When energy is transformed, the amount of usable energy?

If an object weighs 39.2 n on earth, what is its mass

What happens when pressure is applied to a solid.

A box of mass 1 kg is hung from a spring scale. The reading on the spring scale is approximately 10N. What would be the reading on the spring scale if a box of mass 5 kg is hung from it? (Assume acceleration due to gravity to be 10 m/s2.