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A point moves in the plane so that its tangential acceleration wt = a, and its normal acceleration wn = bt4, where a and b are positive constants, and t is time. At the moment t = 0 the point was at rest. Find how the curvature radius R of the point's trajectory and the total acceleration w depend on the distance covered s.
the inside and outside temperature of a carnot refrigerator are 10*C and 25*C, respectively. find the work required in each cycle
Suppose you have a spherical balloon filled with air at room temperature and 1.0 atm pressure; its radius is 18cm. what's the balloon's new radius
Suppose the AC voltage from a power company is 20000v, two transformers are used to step down the voltage. The first transformer has 5000 turns in the primary coil and 250 turns in the secondary coil; the second transformer has 4000 turns in the p..
A machine part rotates at an angular speed of 0.66 rad/s; its speed is then increased to 3.0 rad/s at an angular acceleration of 0.66 rad/s2. Find the angle through which the part rotates
A Mercedes-Benz 300SL (m = 1700 kg) is parked on a road that rises 15º above the horizontal. What is the magnitude of the static frictional force that the ground exerts on the tires
Cliff and Will support the board at each end so that it is horizontal. What force does Will apply to the board
as an Acapulco cliff diver drops to the water from a height of 48 m, his gravitaional potential energy decreases by 27000J. What is the divers weight in newtons
A box is being lowereed down a wall at a constant speed. A hand is pushing on the edge of the box with a 50N of force at a 45 degree angle with respect to the horizontal. The box weighs 40N. Find the coefficient of kinetic friction between the ..
Find where is the near point of an eye for which a contact lens with a power of +2.90 diopters is prescribed
A 1.5 kg box moves back and forth on a horizontal surface with a coefficient of kinetic friction 0.18 between two different springs, 0.83 m apart. The box is initially pressed against the stronger spring (spring constant, k=32N/cm), compressing i..
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 1.50 × 10-10 T. How much energy does this wave carry through the window during a 30 s phone call
A classmate throws a 1.3-kg book from a height of 1.2 m above the ground straight up into the air. Determine the velocity of the book just before hitting the ground
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