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If the efficiency of a reversible engine is 28.%,
(a) what is its COP operated as a refrigerator?
(b) what is its COP operated as a heat pump?
The flywheel of an engine has a moment of inertia 2.40- {rm kg} cdot {rm m}^{2} about its rotation axis. What is its final kinetic energy.
The potential difference between the plates of a capacitor is 180V. Midway between the plates; a proton and an electron are released. The electron is released from rest.
As a treatment for chronic back pain, a medical patient may be fitted with a device that passes a small electrical current , how many electrons pass through the muscles during one pulse
In a popular amusement park ride, a rotating cylinder of radius 4.00 m is set in rotation at an angular velocity of 6.00 rad/s. The floor then drops away, leaving the riders suspended against the wall in a vertical position.
If a freight train can accelerate at 0.050 m/sec2, how far must it travel to increase its speed fro 2.0 to 8.0 m/sec?
A person hums into the top of a well and finds that standing waves are established at frequencies of 10, 30, and 50 Hz. How deep is the well
The 1 kg block is tied to the wall with a rope. It sits on top of the 2 kg block. The lower block is pulled to the right with a tension force of 20 N. The coefficient of kinetic friction at both the lower and upper surfaces of the 2kg block is = 0..
Three equal point charges, each with charge 1.00 , are placed at the vertices of an equilateral triangle whose sides are of length 0.350. Illustrate what is the electric potential energy of the system?
One cubic centimeter of a cumulus contains 250 water drops, which have a typical radius of 10 μm. (a) How many cubic meters of water are in a cylindrical cumulus cloud of height 3.0 km and radius 1.1 km.
Gas lanterns used on camping trips have mantles (small lacy bags that give off light) made from a rayon mesh impregnated with thorium and other materials. A typical mantle contains 439 mg of thorium. What is the reactivity of the mantle
You drive your 1,465-kg car at a constant speed of 25 mph down a ramp that has a grade of 12 %. Define positive direction in the forward direction
What is the magnitude of the potential difference between two points that are 1.15 cm and 2.99 cm from a proton? Answer in units of V.
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