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A concrete slab is 10.9 cm thick and has an area of 5.1 m2. Electric heating coils are installed under the slab to melt the ice on the ground in the winter months. Find what minimum power must be supplied to the coils to maintain a temperature difference of 20.0°C between the bottom of the slab and its surface? Assume all the energy lost is through the slab. W
A uniform ladder 5.0 m long rests against a frictionless,vertical wall with its lower end 3.0 m from the wall. How far along the ladder can the man climb
Three springs each hang from a ceiling with a stationary block attached to the lower end. The blocks (with m1> m2 > m3) stretch the springs by equal distances. Each block-spring system is then set into vertical SHM. Rank the masses according to the p..
A long straight wire carries a current of 6.2 A. The wire is horizontal in the plane of the page (screen), Calculate the force that acts on the electron
Four charges are located in the x-y plane as follows: q@(0,0); 3q @ (a,0); 2q @ (0,a) and -4q @ (a,a). What is the electric force at the center of this distribution
Consider an RLC circuit with driving emf amplitude %u0395m = 12 V, Find the amplitude of the voltage across the inductor at resonance
Sketch a sinusoidal wave with an amplitude of 1 cm and a wavelength of 7 cm. What is the amplitude of the sum of these waves
at the start of a race a four-man bobsled team pushes their sled as fast as they can along a 50 m flat starting
A hunter wishes to cross a river that is 2.10 km wide and that flows with a speed of 4.4 km/h. The hunter uses a small powerboat that moves at the maximum speed of 12.60 km/h with respect to the water.
The angular speed of an automobile engine isincreased at a constant rate from 1500rev/min to 2500 rev/min in13 s. How many revolutions does the engine make during this13 s interval
A uniform electric field of magnitude 600 N/C exists between two parallel plates that are 4.24 cm apart. Determine the distance from the positive plate at which the two pass each other. Ignore the electrical attraction between the proton and electr..
Three men are riding on a train of proper length L that is moving at speed v = 3/5 c with respect to the ground, Calculate the time difference between the two emissions, in both frames
An early .75 caliber rifle fires a 12 gram spherical ball at 800 ft/sec with a spin of 1 revolution per 114 mm. How much energy is in the rifle ball
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