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At a construction site, a 62.0 kg bucket of concrete hangs from a light (but strong) cable that passes over a light friction-free pulley and is connected to an 84.0 kg box on a horizontal roof. The cable pulls horizontally on the box, and a 50.0 kg bag of gravel rests on top of the box. The coefficients of friction between the box and roof are the following: μk=0.400 and μs=0.700. The system is not moving. Find the friction force on the box.
A thick, conducting, spherical shell of inner radiusa = 0.7 cm and outer radius b = 1.3 cm is uncharged. The shell surrounds a point charge +Q = 3.10×10-3 C at itscenter (se
The velocity of an object in simple harmonic motion is given by v(t)= -(0.287 m/s)sin(18.0t + 2.00π), where t is in seconds. What is the first time after t=0.00 s at which the
Since the heat insulation is not perfect, some heat flows into the freezer at a rate of 60 W. Find the power of the motor that is needed to maintain the temperature in the f
A deep-space probe moves away from Earth by a speed of 0.78c. An antenna on the probe requires 4.0 s, in probe time, to rotate during 1.0rev. How much time is required for 1.0
A large punch bowl holds 3.95 kg of lemonade (which is essentially water) at 20.0° C. A 0.42-kg ice cube at 10.2° C is placed in the lemonade. What is the final temperature of
A large piece of cork weighs 0.200 N in air. When held submerged underwater by a spring scale as shown in the figure shows that the spring scale reads 0.606 N. discover the de
When red light in a vacuum is incident at the Brewster angle on a certain type of glass, the angle of refraction is 39.0°. What is the index of refraction of the glass
A laser beam moves from the bottom of an aquarium towards the surface. The beam describes an angle of 48.75 degrees fromthe normal measured at the surface. (The laser is not
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