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A 3 x 10^2 kg piano is being lifted at a steady speed from groundlevel straight up to an apartment 10.0 m above the ground. Thecrane that is doing the lifting produces a steady power of 4.00 x10^2 W. How much time does it take to lift the piano?a. 73.5 sb. 64.7 sc. 55.1 sd. 69.5 se. 60.0 s
A 9.00 x 15.0 swimming pool slopes linearly from a 1.00 depth at one end to a 3.80 depth at the other. What is the mass of water in the pool
If an average frequency emitted by a 200,-,rm W light bulb is 5.00 times 10^{14} , {rm Hz}, and 10.0 percent of the input power is emitted as visible light, approximately how many visible-light photons are emitted per second .
A 50 kg woman stands on the back of a 6 m long, 125 kg raft that is floating at rest in still water with no friction. The raft is 0.50 m from a fixed pier.
Imagine trying to build a portion of a draw bridge as in the following. The side towers reach h=100 meters high above the road level. what is the total tension in the lift wire
calculate the total mechanical energy of the glider at any point in its motion. Calculate the maximum speed of glider.
Two metal spheres of different sizes are charged such that the electric potential is the same at the surface of each. Sphere A has a radius 7 times that of sphere B. Let and be the charges on the two spheres, and let and be the electric-field magnitu..
A boat came to rest at the surface of the ocean before it started to sink. Due to the resistance of the seawater, the sinking boat reached a terminnal velocity of 10m/s for 30 s . Determine the average acceleration of the ocean liner during this peri..
A system receives 107 joules in the form of heat energy in a specified process and it produces work of 4*10^6 joules. The system velocity changes from 10km/s to 25 km/s and its elevation changes from 20m to 12m. The mass of the system is 50 kg. Deter..
A 2000kg car accelerates from 20 to 60km/h on an uphill road. Determine the work done by the engine
The bones of a saber-toothed tiger are found to have an activity per gram of carbon that is 14.5 % of what would be found in a similar live animal
An AC generator supplies 215 V peak voltage at 125 Hz frequency. How much power is dissipated in a resistor with R=165 ohms resistance connected to the generator
A spherical shell has an outside radius of 2.6cm and an inside radius of a. The shell wall has uniform thickness and is made of a material with density 4.70g/ cm3. The space inside the shell is filled with a liquid having a density of 1.23g/cm3.
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