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A child is twirling a 0.0148-kg ball on a string in ahorizontal circle whose radius is 0.143 m. The ball travels oncearound the circle in 0.402 s. (a) Determine the centripetal force acting on the ball. (b) If the speed is doubled, by what factor does the centripetal forceincrease?
Calculate the electric field at the center of a square 53.7 cm on a side if one corner is occupied by a +38.5 µC charge and the other three are occupied by -29.4 µC charges.
A playground merry-go-round of radius R = 2.20 m has a moment of inertia I = 235 kg · m2, What is the new angular speed of the merry-go-round
Find out the total work done on the car by the external forces.
Two blocks are free to slide along the frictionless wooden track shown below. The block of mass m1 = 4.94 kg is released from the position shown, Calculate the maximum height to which m1 rises
A professor drives off with his car (mass 820 kg), but forgot to take his coffee mug (mass 0.38 kg) off the roof. What is the maximum acceleration of the car
In a 231-turn automobile alternator, the magnetic flux in each turn is fB = (2.36E-4 T*m2) cos(?t), where ? is the angular speed of the alternator. determine the maximum emf in the alternator
A bird sits on a high-voltage power line with its feet 4.6 cm apart. What is the potential difference between the bird's feet
The passengers in a carnival ride travel in a circle of radius 5.0 m. They make one complete circle in a time t=4.0 S. What is their acceleration
A candle 4.30 cm tall is 39.1 cm to the left of a plane mirror. Where is the image formed by the mirror
Two balls with masses of 2.0 kg and 6.0 kg travel toward each other at speeds of 12 m/s and 4.0 m/s, respectively. how much kinetic energy is lost in the collision
A 40.00-W eletric motor is able to accelerate a 8755 g car from rest to 30.00 mph in 31.10 seconds. Calculate the efficiency of the motor
Water flowings through a 2.1 cm diameter pipe can fill a 400 L bathtub in 5.2 min. What is the speed of the water in the pipe
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