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A potter's wheel -- a thick stone disk of radius 0.500 m and mass 120 kg -- is freely rotating at 50.0 rev/min. The potter can stop the wheel in 6.00 s by pressing a wet rag against the rim and exerting a radially inward force of 63.0 N. Find the effective coefficient of kinetic friction between the wheel and the rag.
A 22 gauge NiAg wire is 22.5 km long. The resistivity of the NiAg wire is 33.0*10^-8 Ohm*m. The cross sectional area of the wire is 3.22*10^-7. How much energy is dissipated in a day
define the speed with which the cart reaches positions 3, 2, and 1 (in that order). Neglect friction. Let g = 9.81 m/s2.
A person weighing 119 pounds can run up 500 steps, How much power did the person expend running up the steps
A cart with mass 320 g moving on a frictionless linear air track at an initial speed of 1.9 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. What is the speed of the two-cart center of mass
An underwater scuba diver sees the Sun at an apparent angle of 36.0° from the vertical. What is actual direction of the Sun
The diameter of a blood vessel narrows by 70% due to the presence of a plaque on the blood vessel walls. what is the systolic blood pressure in the narrowed vein (in mmHg)
an induction roller coaster can accelerate a train from zero to 27m/s in 2.5 seconds. What is the average force exerted on a 68kg rider
The G string of a guitar which should be 397 Hz is playing flat at 380 Hz. What percentage change in the tension of the wire is necessary so as to tune the string to 392 Hz.
A massless frictionless pulley, an ideal string, and two masses (m1 = 2.50 kg and m2 = 4.00 kg) are connected together, What is the magnitude of the tension force in the string
A person drives a car around a circular cloverleaf with a radius of 64 m at a uniform speed of 10 m/s. What is the acceleration of the car
A long, current-carrying solenoid with an air core has 1550 turns per meter of length and a radius of 0.0230 m. What is the mutual inductance of this system
A hydraulic jack is made with a small piston 1.4 cm in diameter that is used to move a large piston 5.8 cm in diameter. how heavy a load can he lift with the jack
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