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Suppose some children push a merry-go-round so that it turns twice as fast as it did before they pushed it. What are the relative changes in angular momentum and rotational kinetic energy?
A series LR circuit with L = 20 mH and R = 2.0 k? is connected to a potential source of amplitude 5.0 V and angular frequency 200 rad/s. find the voltage across the resistor and the inductor
A speeding car is traveling at a constant speed of 39m/s. A police car starts from rest just as the speeder passes it, How long does the police car take to catch the speeder
the speed of sound in an alcohol at a temperature of 20 c is 1260 ms. the density of the alcohol at that temperature is
Two diamonds begin a free fall from rest from the same height, 1.1 s apart. How long after the first diamond begins to fall will the two diamonds be 18 m apart?
After being accelerated to a speed of 1.76×105m/s , the particle enters a uniform magnetic field of strength 0.800T and travels in a circle of radius 35.0cm, Find the ratio m/q for this particle
An electron confined in a one- dimensional box is observed, at different times, to have energies of 12eV, 27eV, and 48eV. What is the minimal length of the box?
what is th capacitance of a parallel plate capacitor where the plates have an area 5 sq meters and are separated by a
A body lighter than water requires a force of 20 N to hold it under water. If it weighs 75 N in air, what is its density and specific gravity?
A person eats a dessert that contains 230 kcal. The skin temperature of this individual is 36° C and that of her environment is 21° C. The emissivity of her skin is 0.85 and its surface area is 1.3 m2. How much time would it take for her to emit the ..
The drawing below shows a balanced Michelson interferometer with perfectly equal length arms in which a piece of glass (n = 1.4) has been inserted into the horizontal arm.
Aluminum wire has been utilized to replace copper wire through times of high copper prices. if 20 gauge copper wire has a resistance of 33Ω per kilometre of length, decide the diameter of an aluminum wire with same resistance? (Resistivity of the alu..
It takes 4.186 Joule of energy to raise the temperature of 1 gram of water by 1oC. Determine how fast would a cricket have to jump to have that much kinetic energy
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