Homework Answers
7. (20 pts) A force of 50 N is used to move a 5 kg box...
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?
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 velocity 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...
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...
10. A 50-kg box is 10 meters above the floor. This box is lifted 20 meters...
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.
3. A worker pushes constantly downward on a box of mass 43.0 kg with a force...
3. A worker pushes constantly downward on a box of mass 43.0 kg with a force of 230 N at an angle of 26.0° from the horizontal. The box starts from rest and moves across a level floor for a distance of 3.66 m. The coefficient of kinetic friction is -0.384 230 N 43.66 m a) Show that the normal force on the box is 522 N. b) Find the force of friction on the box. c) What is the...
A horizontal force of magnitude 32.1 N pushes a block of mass 3.91 kg across a...
A horizontal force of magnitude 32.1 N pushes a block of mass 3.91 kg across a floor where the coefficient of kinetic friction is 0.579. (a) How much work is done by that applied force on the block-floor system when the block slides through a displacement of 2.99 m across the floor? (b) During that displacement, the thermal energy of the block increases by 33.6 J. What is the increase in thermal energy of the floor? (c) What is the...
A horizontal force of magnitude 41.6 N pushes a block of mass 3.86 kg across a...
A horizontal force of magnitude 41.6 N pushes a block of mass 3.86 kg across a floor where the coefficient of kinetic friction is 0.591. (a) How much work is done by that applied force on the block-floor system when the block slides through a displacement of 3.38 m across the floor? (b) During that displacement, the thermal energy of the block increases by 37.8 J. What is the increase in thermal energy of the floor? (c) What is the...
WORK AND POWER PRACTICE PROBLEMS John pushes horizontally with an 40 N force on a 50...
WORK AND POWER PRACTICE PROBLEMS John pushes horizontally with an 40 N force on a 50 kg mass 20 m across a floor Calculate the amount of work lee did If this task takes 1.0 minutes, how much power was generated? The third floor of a house is 9.0 m above street level How much week is needed to move a 175 kg refrigerator from the street to the third floor? If this takes 300 0 s. how much power...
A horizontal force of magnitude 39.5 N pushes a block of mass 4.05 kg a distance...
A horizontal force of magnitude 39.5 N pushes a block of mass 4.05 kg a distance of 3.00 m across a floor, where the coefficient of kinetic friction is 0.600. (a) How much work is done by that applied force on the block-floor system? (b) During that displacement, the thermal energy of the block increases by 44.0 J. What is the increase in thermal energy of the floor? (c) What is the increase in the kinetic energy of the block?
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?
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 velocity 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...
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.
3. A worker pushes constantly downward on a box of mass 43.0 kg with a force of 230 N at an angle of 26.0° from the horizontal. The box starts from rest and moves across a level floor for a distance of 3.66 m. The coefficient of kinetic friction is -0.384 230 N 43.66 m a) Show that the normal force on the box is 522 N. b) Find the force of friction on the box. c) What is the...
A horizontal force of magnitude 39.5 N pushes a block of mass 4.05 kg a distance of 3.00 m across a floor, where the coefficient of kinetic friction is 0.600. (a) How much work is done by that applied force on the block-floor system? (b) During that displacement, the thermal energy of the block increases by 44.0 J. What is the increase in thermal energy of the floor? (c) What is the increase in the kinetic energy of the block?
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