10 of 20 Student A lifts a box of mass m to a height of h....
10 of 20
Student A lifts a box of mass m to a height of h. Student B lifts a box of mass 2 m to a height of h/2. Which student exerted the greatest power?
| Student A | |
| Student B | |
| Neither student A nor student B (The students exerted the same power.) | |
| Not enough information |
12 of 20
How much energy is stored in spring that has been compressed 0.20 m if the spring constant is 300 N/m?
| 9000 J | |
| 60 J | |
| 30 J | |
| 6 J |
Question
13 of 20
A medium-sized air conditioning unit is rated at 900 W. How much energy will the AC unit require in order to operate for 2.0 hours?
| 1800 J | |
| 450 J | |
| 1.08x105 J | |
| 6.48x106 J |
Homework Answers
A medium-sized air conditioning unit is rated at 900 W. How much energy will the AC...
A medium-sized air conditioning unit is rated at 900 W. How much energy will the AC unit require in order to operate for 2.0 hours? 1800 J 450 J 1.08x105 J 6.48x106 J
A box of mass m is dropped from a height H above a spring. The platform...
A box of mass m is dropped from a height H above a spring. The platform has negligible mass. The spring has spring constant k. (a) By what amount is the spring compressed? Your answer requires the quadratic equation; to choose the correct root, note that x needs to be positive. (b) What is the speed of the box when it is first in contact with the platform? (c) What is the maximum speed of the box? Hint: the box...
A student lifted a box of mass m to height h. The work done by each...
A student lifted a box of mass m to height h. The work done by each the student and the gravitational force (mg), respectively are: Select one: a. negative, positive b. positive, positive c. positive, negative d. negative, negative
M A mass M-1.2 kg is released from rest. From the initial height of 75 cm...
M A mass M-1.2 kg is released from rest. From the initial height of 75 cm above the ground, the mass drops from an free spring (neither compressed, nor extended) of constant k = 590 N/m. The maximum compression of the spring, due to the impact of the dropping mass is sh = 160 mm. Analyse the system with respect to the balance of energy, and the apply the conservation of energy, considering the ground level as reference of the...
M 7 A mass M = 1.2 kg is released from rest. From the initial height...
M 7 A mass M = 1.2 kg is released from rest. From the initial height of 75 cm above the ground, the mass drops from an free spring (neither compressed, nor extended) of constant k = 590 N/m The maximum compression of the spring, due to the impact of the dropping mass is sh = 160 mm. Analyse the system with respect to the balance of energy, and the apply the conservation of energy, considering the ground level as...
com a A box is falling from a building starting from Test at height H=10 m....
com a A box is falling from a building starting from Test at height H=10 m. The box has mass M=1 Kg. When the box is at height h=5 m from the ground a) What is its velocity V=? b) A bullet with mass m=1 kg is shout upward from the ground and hit the box at height h=5 m. What is the minimum velocity of the bullet u=? when it hits the box such that the box momentarily stops...
6. Consider the system shown: m, J, R The wheel with mass m, radius R, and rotational moment of i...
6. Consider the system shown: m, J, R The wheel with mass m, radius R, and rotational moment of inertia J rolls without slipping down the incline shown. The spring affixed to its axle has rest length h, and is neither extended nor compressed when r 0. The external force F is directed parallel to the direction of rolling. Find the total kinetic energy and potential energy in the system. Assume the gravitational potential energy to be zero when the...
te M of estion M A mass M = 1.2 kg is released from rest. From...
te M of estion M A mass M = 1.2 kg is released from rest. From the initial height of 90 cm above the ground, the mass drops from an free spring (neither compressed, nor extended) of constant k = 580 N/m. The maximum compression of the spring, due to the impact of the dropping mass is dh = 180 mm. Analyse the system with respect to the balance of energy, and the apply the conservation of energy, considering the...
For the following problem, show all work. Circle your answers. A box of mass m =...
For the following problem, show all work. Circle your answers. A box of mass m = 5.0 kg is sitting on a ramp, which is elevated at an angle 0 = 20°, compressing a spring Ar = 0.5 m. The spring is released, causing the box to slide up the ramp. At some point, the spring becomes detached from the box. The total length of the ramp is L = 4.0 m and it has a coefficient of kinetic friction...
Name (print): A box with mass m and kinetic energy KA is at the top of...
Name (print): A box with mass m and kinetic energy KA is at the top of a curved ramp as seen below. meters (a) write an energy statement for each point on the ramp. E. = K. + U. E = F For parts (b)-(d) use the following values: KA = 50), k = 350 N/m,m = 3 kg (b) Solve for the speed of the cart at point B. (c) Solve for the speed of the cart at point...
A student lifted a box of mass m to height h. The work done by each the student and the gravitational force (mg), respectively are: Select one: a. negative, positive b. positive, positive c. positive, negative d. negative, negative
M A mass M-1.2 kg is released from rest. From the initial height of 75 cm above the ground, the mass drops from an free spring (neither compressed, nor extended) of constant k = 590 N/m. The maximum compression of the spring, due to the impact of the dropping mass is sh = 160 mm. Analyse the system with respect to the balance of energy, and the apply the conservation of energy, considering the ground level as reference of the...
M 7 A mass M = 1.2 kg is released from rest. From the initial height of 75 cm above the ground, the mass drops from an free spring (neither compressed, nor extended) of constant k = 590 N/m The maximum compression of the spring, due to the impact of the dropping mass is sh = 160 mm. Analyse the system with respect to the balance of energy, and the apply the conservation of energy, considering the ground level as...
com a A box is falling from a building starting from Test at height H=10 m. The box has mass M=1 Kg. When the box is at height h=5 m from the ground a) What is its velocity V=? b) A bullet with mass m=1 kg is shout upward from the ground and hit the box at height h=5 m. What is the minimum velocity of the bullet u=? when it hits the box such that the box momentarily stops...
6. Consider the system shown: m, J, R The wheel with mass m, radius R, and rotational moment of inertia J rolls without slipping down the incline shown. The spring affixed to its axle has rest length h, and is neither extended nor compressed when r 0. The external force F is directed parallel to the direction of rolling. Find the total kinetic energy and potential energy in the system. Assume the gravitational potential energy to be zero when the...
te M of estion M A mass M = 1.2 kg is released from rest. From the initial height of 90 cm above the ground, the mass drops from an free spring (neither compressed, nor extended) of constant k = 580 N/m. The maximum compression of the spring, due to the impact of the dropping mass is dh = 180 mm. Analyse the system with respect to the balance of energy, and the apply the conservation of energy, considering the...
For the following problem, show all work. Circle your answers. A box of mass m = 5.0 kg is sitting on a ramp, which is elevated at an angle 0 = 20°, compressing a spring Ar = 0.5 m. The spring is released, causing the box to slide up the ramp. At some point, the spring becomes detached from the box. The total length of the ramp is L = 4.0 m and it has a coefficient of kinetic friction...
Name (print): A box with mass m and kinetic energy KA is at the top of a curved ramp as seen below. meters (a) write an energy statement for each point on the ramp. E. = K. + U. E = F For parts (b)-(d) use the following values: KA = 50), k = 350 N/m,m = 3 kg (b) Solve for the speed of the cart at point B. (c) Solve for the speed of the cart at point...
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