Science 10 - Physics Name: Science 10 - Physics Name: Practice Time! 1. A 100 Newton force is applied to a 15kg box in the horizontal direction and moves it 5 Practice Problems! (1 HorsePower (HP) = 746 Watts) 1. How much work is done when an object is pushed 23 m by a 550 N force? (12, 650 J) meters horizontally. How much work was done? (500 J) 2. A crane lifts a 3500 kg pale of cement up 14 m in 65 seconds (480000 J, 7390 W, 9.9 HP) 2. Linda takes a 300 N suitcase up 3 flights of stairs for a total vertical distance of 16 a) Find the work b) find the power c) find the horsepower meters. She then pushes the suitcase with 100 N of Force the remaining 8 meters to her 3. A 78 kg runner climbs the grouse grind (800 m) in 40 minutes (612000 J, 225 W, 0.34 HP) hotel room. How much work was done over her whole trip? (5600 J) a) Find the work b) find the power c) find the horsepower 4. A 65 kg student climbs the stairs at kits (8.0 m) in 12 seconds. (5096 J, 425 W, 0.57 HP) a) Find the work b) find the power c) find the horsepower 5. How long would it take a 100 W pump to lift 300 kg of water up 45 m from a well? (1323 s or 22 min) 3. A person uses 255 J of energy to push a shopping cart over a 15 m long aisle. How much Force was used? (17 N) 4. A toy cart is pushed using 12 N of Force, which resulted in 144 J of work. How long was 6. How long would it take a 250 hp crane to raise 2500 kg 25 m? (3.3 s) the cart pushed for? (12 m) 5. A 25.0 kg object is pushed with an acceleration of 2.50 m/s', over the course of 5.00 m. How much work was done on the object? (313 J) 7. How much water (in kg) could a 500 W pump pump up out of a 35 meter deep well in 2 minutes? (175 kg) 6. Extending: What acceleration does a 1.50 kg object have if it did 650 J of work over a distance of 10.0 m?(43.3 m/s?) Notes Modified from Mr. Mullen's Notes