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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 sinusoidal wave travels along a stretched string. A particle on the string has a maximum velocity of 1.40 and a maximum acceleration of 250 . Part A What is the frequency of the wave? Part B What is the amplitude of the wave?
How do paramagnetic materials differ from diamagnetic materials?
A crate is sliding down a ramp that is inclined at an angle of38 degrees above the horizontal. Find the acceleration of the moving crate
Suppose the magnitude of the gravitational force between two spherical objects is 2000 when they are 100 apart. find the magnitude of the gravitational force between the objects
an iron wire has a cross-sectional area of 1.01 x 10-5 m2. carry out steps a through e to compute the drift speed of
An archer fires an arrow by an initial velocity of 21 m/s at an angle of 50 from the horizontal. The arrow lands on a hill that is 5.0 m higher than its initial height. Ignore the effects of air resistance. What speed does the arrow have when it land..
Two point charges 0.606 m apart experience a repulsive force of 0.368 N. The sum of the two charges equals 1.08 10-5 C
explain at least two key elements for producing ideas that you believe led the american colonists to the boston tea
A police car is stopped for a red light. A truck moving at a constant velocity of 15 m/s passes the police car, and illegally goes through the red light. How far will the police car have traveled in this time
Suppose a ski-jumper lands at a point 63 m down an incline of 35 degrees, What was her speed at take-off
You compress a spring with k = 3000 N/m a distance of 0.2 m with a block of mass 4 kg. You then release the block. It slides along a frictionless surface and then goes up an incline of 35 degrees. How far up the incline (along the hypotenuse of the t..
A square, single-turn coil 0.180 m on a side is placed with its plane perpendicular to a constant magnetic field. An emf of 18.0 mV is induced in the winding when the area of the coil decreases at a rate of 0.0700 m 2/s. Compute the magnitude of the..
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