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A student living in a 4-m X 6-m X 6-m dormitory room turns on her 150-W fan before she leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming all the doors and windows are tightly closed and disregarding any heat transfer through the walls and the windows, determine the temperature in the room when she comes back 10 h later. Use specific heat values at room temperature, and assume the room to be at 100 kPa and 15°C in the morning when she leaves.
A device uses a Stirling cycle on 433 moles of a monatomic ideal gas between two reservoirs with temperatures of 416 K, How much work is done by the device on the gas
The track near the top of your favorite roller coaster has a circular shape with a diameter of 22 m. What is the speed of the roller coaster
Two simple pendulums have length of 81-cm and 64-cm they are released from the same angular position at the same instant. After how much time would they both arrive at their initial position simultaneously.
a skateboarder starting from rest rolls down a 15.0 m ramp. when she arrives at the bottom of the ramp her speed is
A 1.05 µF capacitor initially charged to 10.5 V, discharges when it is connected in series with a resistor. What is the voltage across the capacitor at t = 5 second if the capacitor is instead charged by the same battery through the same resistor
A textbook of mass 1.91 kg rests on a frictionless, horizontal surface. compute the tension in the part of the cord attached to the book
A playground merry-go-round has radius 2.50mand moment of inertia 2800kg?m2 about a vertical axle through its center, What is the average power supplied by the child
Two circuits contain an emf produced by a moving metal rod, likethat shown in the drawing. The speed of the rod is the same in eachcircuit, but the bulb in circuit 1 has one-half the resistance of the bulb in circuit 2.
A certain toaster has a heating element made of Nichrome resistance wire, What is the final temperature of the heating element
A 49.7 kg sled starts at rest on a horizontal road. The coefficient of kinetic friction between the sled and the road is ?k = 0.247. estimate the work done by the frictional force on the sled
Zinc has a density of 7.14 g/cm3, and the mass of a zinc atom is 1.09 10-25 kg. What is the distance between the centers of adjacent atoms
A bright object and a viewing screen are separated by a distance of 80 cm. At what locations among the object and the screen must a lens of focal length 14 cm be placed in order to produce a crisp image on the screen?
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