A person of mass m stands on roller skates facing a wall. After pushing against the wall with a constant force F he moves away, reaching speed v after a distance d. What is the work done by F?

A machine uses 1000 j of electric energy to raise a heavy mass, increasing its potential energy by 300 j. what is the efficiency of this process? yahoo

What is a sentence using dimensional analysis

What does the prefix mean in the word unicellular? list one other word with the same prefix and give an explanation of it

A girl throws a rock horizontally, with a velocity of 10 m/s, from a bridge. It falls 20 m to the water below. How far does the rock travel horizontally before striking the water?

A 12-V battery is connected to an air-filled capacitor that consists of two parallel plates, each plate has an area of 7.60 cm2 . The separation between the plates of the capacitor is d = 0.30 cm.

When a light shines through an object it is called

A man goes from his house to office with a speed of 57km/hr and returns to the house with a speed of 83km/hr in his car. Calculate the average speed of the car.

Identify several factors in the environment that can affect physical fitness levels.

Do Brain cells act and look like skin cells? Why or why not?

A taxi hurries for 1 3/4 hours with a constant speed of 84 mph and then for another 1 hour 45 minutes with a constant speed of 24 mph. what is its average speed for the total trip?