
7. (20 pts) A force of 50 N is used to move a 5 kg box 30 m across a level floor. a. How much work was done on the box?...
7. (20 pts) A force of 50 N is used to move a 5 kg box 30 m across a level floor a. How much work was done on the box? b. If the movement takes 10 seconds, what is the average velo city of the box during the move? c. What is the average kinetic energy of the box during the move? d. What is the change in potential energy as a result of this move?
7. (20 pts) A force of 50 N is used to move a 5 kg box 30 m across a level floor. 2. How much work was done on the box? b. If the movement takes 10 seconds, what is the average vclocity of the box during the move c What is the average kinetic energy of the box during the move? d. What is the change in potential energy as a result of this move?
4. (20 pts) You place 150 mL of water at 400C in the refrigerator. How much energy does the refrigerator remove from the water to make ice at 0OC? (Note 1: 1 mL H20 = 1 cm' = 1 g. Note 2: See Table 4.4 in your text, along with the subsequent example.) 5. (15 pts) How much heat must be applied to a 1 kg pan to raise its temperature from 25°C to 185°C if: a. The pan is...
a) how much work is done in raising a 50.0 kg crate a distance of 1.5 m above a storeroom floor?b) what is the change of potential energy as a result of this move?c) how much kinetic energy will the crate have as it falls and hits the floor?please show work
a) how much work is done in raising a 50.0 kg crate a distance of 1.5 m above a storeroom floor? b) what is the change of potential energy as a result of this move? c) how much kinetic energy will the crate have as it falls and hits the floor? please show work
A 30.0-kg crate is pushed across a rough floor by a horizontal force of 100 N of kinetic fiction between the crate and the floor is 0.100. If a total of 80.5 1 of work the crate, how far was it moved along the floor? done 21. Find the magnitude of the force ating on a 3.0-kg (assume all units in MKSo-ms cated at -2.0 m inside a potential 22. Which one of the following statements is false? More power...
A box is moved 10 m across by a floor a force or 25 N acting along the direction of motion. The work done by the force is __________ A painter of mass 70 kg climbs 3.0 m up a ladder. The painter's potential energy has increased by ____________
10. A 50-kg box is 10 meters above the floor. This box is lifted 20 meters to point B. It is then lowered 25 meters to point C. a. What is the change in potential energy of the box between points A and C? b. What power is required to move the box from point A to point in 20 seconds? Give answer in both Watts and horsepower.
A box of mass 40 kg is initially at rest on a flat floor. The coefficient of kinetic friction between the box and the floor is µk = 0.40. A woman pushes against the box with a force of 250 N that makes an angle of 30° with the horizontal until the box attains a speed of 1.0 m/s. (a) What is the change of kinetic energy of the box? (b) What is the work done by the friction force...