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On a cold day, 25000 J of heat leaks out of a house. The inside temperature is 22 °C, and the outside temperature is -15 °C.
What is the increase in the entropy of the universe that this heat loss produces?
A spring (k =805N/m) is hanging from ceiling of an elevator, and a 5.0-kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a = 0.47m/s2.
A copper wire with a cross sectional area of 3.00 mm^2 and a length of 2.00 m at 20.0 degrees C is connected to a 25.0 V battery, what is the resistance at 20.0 degrees C
a river with a water temperature T(L)=20 degree C is to be used as the low temperature reservoir of a large power plant, what is the largest electrical output that the plant can deliver to its customers
In fair weather, over flat ground, there may be a downward electric field of 155 N/C. (a) Assume that the Earth is a conducting sphere with charge on its surface.
A particle moving along the x axis in simple harmonic motion starts from its equilibrium position, the origin, at t = 0 and moves to the right. The amplitude of its motion is 1.70 cm and the frequency is 1.30 Hz.
A uniform plank of length 5.40 m and weight 217 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 417 N walk on the overhanging part of the plank before it immedia..
What is horizontal distance from press box to second base
The system is released from rest with the rod horizontal. If the animals can manage to hold on, illustrate what are their speeds as the rod swings through a vertical position?
A car travels along a straight line at a constant speed of 58.5 mi/h for a distance d and then another distance d in the same direction at another constant speed.
Use conservation of energy to calculate the speed of the alpha particle at infinity. m/s (e) If the two protons are released from rest and the alpha particle remains fixed, calculate the speed of the protons at infinity. m/s
Two charged pith balls are suspended on very light 10.7 cm strings. Each has a mass 11.0 g. In stability, the total angle between the strings is 37 degrees. Draw the free body diagram for one of the pith balls and clearly label all forces with magnit..
The bullet remains in the block, and after the impact the block lands d = 1.5 m from the bottom of the table. Evaluate the initial speed of the bullet.
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