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Q1. Estimate the change in COP of your electric food freezer when it is removed from your kitchen to its new location in your basement, which is 8 C° cooler than your kitchen. (Assume that the temperature in the kitchen is 20°C and that the temperature of the interior of your freezer is -5°C.)
Q2. Cannon tilted up at a 30° angle fires a cannon ball at 90 m/s from atop a 10 m high fortress wall. What is the ball's impact speed on the ground below?
The flywheel of an engine has a moment of inertia 3.00 {rm kg} cdot {rm m} ^ {2} about its rotation axis. What is its final kinetic energy.
What is the wavelength of the waves emitted by source? What is the difference in frequency between directly radiated waves and the waves reflected from a whale travelling straight toward the ship at 4.99? Suppose that the ship is at rest in the water..
If the accelerating plates are 1.60 apart, and have a potential difference of 2.60×10^4, what is the magnitude of the uniform electric field between them.
A 258-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.980, and the log has ..
What is the mass of sculpture (in kg) assume that the local acceleration due to gravity is 9.80 m/s2.
The longest "string" (a thick metal wire) on a particular piano is 3.0 m long and has a tension of 300.0 N. It vibrates with a fundamental frequency of 27.5 Hz. What is the total mass of the wire.
A 37-kg girl is bouncing on a trampoline. All through a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 215 J from 430 J. How high does she rise during this interval? Avoid air resistance.
A force vector points at an angle of 50.6° above the +x axis. It has a y component of +280 newtons. Calculate the magnitude of the force vector.
An open-open organ pipe is 67.9 cm long. AN open-closed pipe has an essential frequency equal to the third harmonic of the open-open pipe. How long is the open-closed pipe.
A block of mass 4.0 kg is put on top of a block of mass M = 5.5 kg. To cause the top block to slip on the bottom one, while the bottom one is held fixed, a horizontal force of at least 16 N must be applied to the top block. The assembly of blocks is ..
An open-pit coal mine consumes 96 hectares of land, down to the depth of 26 m, each year. What volume of earth, in cubic kilometres, is removed in this time.
Two ocean liners, each with a mass of 38,000 metric tons, are moving on parallel courses, 92 m apart. What is the magnitude of the acceleration of one of the liners toward the other due to their mutual gravitational attraction? Treat the ships as par..
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