1. A boy riding a 42kg bicycle that is moving at 15 m/s accelerates the bike to attain a speed of 30 m/s. How much power was used by the boy during such time interval?

2. Using a rope, a girl pulls a wooden box across the floor with a force of 412 N and moves it a distance of 24 ft in 3 minutes. Find her power output if the rope is held at an angle of 45 degrees with the floor.

3. Calculate the amount of force acting on the car windshield measuring 0.5 m x 0.75 m if the wind pressure is 80 kPa.

4. Suppose a certain amount of force acts on surface. By how much wil the pressure increase if the surface area on which force acts is reduce to half?

5. Two liquids A and B of different densities are poured into a 100 - L vessel. filling it to the brim. If the resulting density of the mixture is 800 kg/m3, find the quantity of each liquid use (take note Density1 is not equal to Density2)