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Questions in physics

[Homework Help] What variable can affect the amount of fruit produced by an apple tree?

[Homework Help] How are SI units used in the United States?

[Homework Help] A 1200 kg car starts from rest and travels 100 m in a time of 10 seconds. A) What is the acceleration of the car? B) What force must have acted on the car during this time? C) What is the velocity of the car after 10 seconds? D) What work was done on the car? E) What minimum power did the engine produce?

[Homework Help] A rock is thrown downward from an unknown height above the ground with an initial speed of 21 m/s. It strikes the ground 8 seconds later. Determine the initial height of the rock above the ground. The acceleration of gravity is 9 m/s². Answer in units of meters.

[Homework Help] When Jenny writes, the pencil exerts a force of 5 N on the paper. The area of the pencil in contact with the paper is 0.5 mm². Calculate the pressure of the pencil on the paper. Give the unit.

[Homework Help] What mass of water will fill a tank that is 100.0 cm long, 50.0 cm wide, and 30.0 cm high? Express the answer in grams.

[Homework Help] Explain what surface tension is.

[Homework Help] How were historical solar system models different from our current model?

[Homework Help] Calculate the work needed to move a 130 N trunk to a ledge 2 meters above.

[Homework Help] I need help with understanding density. Can you explain it to me?