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A teenager pushes tangentially on a small hand-drivenmerry-go-round and is able to accelerate it from rest to afrequency of 17 rpm in 9.7 s. Assume the merry-go-roundis a uniform disk of radius 2.1 m and has a mass of680 kg, and two children (each with a mass of 30 kg) sitopposite each other on the edge.
What is the torque required to produce the acceleration,neglecting frictional torque.
What force is required at the edge?
A parallel-plate capacitor has square plates of edge length1.9 cm and a plate spacing of0.030 mm. If the gap between the plates is a vacuum, what is the capacitance?
A spherical balloon has a radius of 6.75m and is filled with helium. The density of helium is 0.179 kg/m3, and the density of air is 1.29 kg/m3. Determine the largest mass of cargo the balloon can lift
water flows through a horizontal pipe, and then out into theatmosphere at a speed of v1=12 m/s. what is the gauge pressure in the left section of the pipe
bartender slides a beer mug at 1.2 m/s towards a customer at the end of a frictionless bar that is 1.3 m tall. What are the speed and direction of the mug at impact
the cube of insulating material has the one corner at the origen . each side of the cube has length 0.250m so the top face of the cube is parallel to the xz-plane and is at y=.250m, calculated the net charge enclosed by the cube
a river of width 32 m flows in a straight line the x direction with a speed of 0.25 ms. a boat is rowed such that it
How much energy was added to accomplish the transformation. What force must be exerted on the smaller piston to support the load.
A 2.00 kg particle moves in the xy plane with a velocity of v = (4.00 - 3.30 ) m/s. Determine the angular momentum of the particle
a pot of hot water is boiling on your stove. the pot is in the shape of a round cylinder made of aluminum which is 10
A 1000 kg roller coaster starts from rest at height H= 25 m above the bottom of a 14 m diameter loop. What is the downward force of the track on the car
A rocket of mass 7 kg moves with a constant velocity of 547 m/s eastward. It suddenly explodes and scatters into two pieces. find the direction of the second part
calculate the speed of an electron that is accelerated through the same potential difference, and Calculate the speed of a proton
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