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It takes an elevator 3.1 minutes to raise a vehicle with a mass of 420 kg from the floor to a height of 8 meters. What size (power) motor (in watts) does it take to do the job? Hint: this is a multiple step problem in which you must derive the variables needed to solve for problem in step one and then apply those values to the final solution of the problem. Watch your units.
A bicycle wheel with a radius of 38 cm is given an angular acceleration of 2.80 rad/s2 by applying a force of 0.25 N on the edge of the wheel. What is the wheel's moment of inertia?
Find the peak magnetic field in an electromagnetic wave whose peak electric field is 200N/C
part a a power plant burns coal and generates an average of 620.0 megawatts mw of electrical power while discharging
You send a beam of light from a material with index of refraction 1.19 into an unkown material. In order to help identify this material, What is the index of refraction of the unknown material
Three point charges are placed at distances of d, 2d, and 3d from a point P. The particle that is 2d away from P has a charge of 6q. From the options given, assign charges to the remaining two point charges such that the potential at point P is zero
Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 3781 kg), which is made of steel (? = 7850 kg/m3). In typical comic-book fashion, they decide to raise the yacht (which is now on the bottom of a lake) by filling it with ping-p..
a pipeline conveying freshwater to a city has an internal diameter of 1.2m and external diameter of 1.25m. the pipeline
A car is traveling in a uniform circular motion on a section of road whose radius is r. The road is slippery, and the car is just on the verge of sliding.
A pitcher throws a fastball horizontally at a speed of 150 km/h toward home plate, 18.4m away. If the batters combined reaction and swing times total 0.37s, how long can batter watch the ball after it has left the pitcher's hand before swinging? In t..
A meter stick with a mass of 89.5 g is being supported at the 50 cm mark with a pivot that is 1.00 cm above the center of mass of the meter stick. The moment of inertia of stick about that point is 0.00746 kgm^2. What is the period of oscillation ..
A current of 0.105 mA flows in a silver wire whose cross-sectional area is 0.930 mm2. Find the density of electrons in the wire, assuming that there is one conduction electron per silver atom
A 1.55kg book is sliding along a rough horizontal surface. At point A it is moving at 3.31m/s , and at point B it has slowed to 1.41m/s. How much work was done on the book between A and B
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