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The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 2.0 rev/s in 8.0 s. At this point, the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub slows to rest in 13.0 s. Through how many revolutions does the tub turn during this 21-s interval? Assume constant angular acceleration while it is starting and stopping.
A man stands on the roof of a building of height 16.8m and throws a rock with a velocity of magnitude 31.8m/s, Calculate the magnitude of the velocity of the rock just before it strikes the ground
You have an open tube that is 1.3m long. what is the fundamental frequency of the wavelength of the tube
A kind of glass has an index of refraction of 1.640 for blue light of wavelength 430 nm, what is the angle between the two beams inside the glass
a common misconception is that the current is used up and steadily declines as it progresses through a series of
Two blocks are connected by a frictionless pulley as shown. Block A has a mass of 71 kg and block B has a mass of 150 kg. Find the acceleration a of block A (in m/s2)
An engineer wishes to determine the specific heat of a new metal alloy. A 0.150-kg sample of the alloy is heated to 540°C. Calculate the specific heat of the alloy
A 15.0 kg block of ice at 0 degrees C falls into Lake Superior, which is a freshwater lake. What is the change in entropy, delta S, of the lake
Mercury has a mass MP = 3.18 x 1023 kg, an orbital period T = 88.0 days, Find the total energy (potential and kinetic) of Mercury in its orbit about the Sun
Nichrome wire of cross-sectional radius 0.780 mm is to be used in winding a heating coil. find the length (in meters) of wire needed to wind the coil
A ray of light in air makes an angle of incidence of 30.2 as it enters an unknown liquid. the refracted ray in the fluid meassured to be 22.5. compute the index of refraction of the unknown liquid
A 71 kg parent and a 19 kg child meet at the center of an ice rink. They place their hands together and push. what is the magnitude of the parent's acceleration
Does an apple tree exert a gravitational force on the earth and if so, how large of a force? Consider and explain this question when the apple is attached to the tree, and when it is falling.
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