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A teenager pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 15 rpm in 10.0 s. Assume the merry-go-round is a uniform disk of radius 2.5 m and has a mass of 760 kg, and two children (each with a mass of 25 kg) sit opposite each other on the edge. Calculate the torque required to produce the acceleration, neglecting frictional torque. What force is required at the edge?
A 6100 kg rocket is set for vertical firing from the Earth's surface. The exhaust speed is 1400 m/s. How much gas must be ejected each second if the thrust is to equal the weight of the rocket
At one instant a bicyclist is 25m due east of a park's flagpole, going due south with a speed of 8 m/s. Then, 11 s later, the cyclist is 65m due north of flagpole, going due east with a speed of 10 m/s.
a spring has a spring constant k 14 8.75 nm. if the spring is displaced 0.150 m from its equilibrium position what is
A 35-kg box is pulled with a 55-N force at 38 degrees above the horizonal surface. what is the net work done on the box
A cardinal (Richmondena cardinalis) of mass 3.80×10^?2 kg and a baseball of mass 0.145g have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of the baseball's momentum?
A solid sphere rolling without slipping on a rough horizontal surface with a linear speed 21m/s collides elastically with a fixed, smooth vertical wall. Find the speed of the solid sphere after it has started pure rolling in the backward direction. T..
A loudspeaker of mass 18.00 kg is suspended a distance of h= 1.60.below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of t= 3.90 m. What is the tension in each of the cables? Use 9.80 for the magnitude ..
A constant force of 200N pulls a 30kg box up a ramp 15m long and 4m high. how much work did the frictional force do in the box
When she tightens the string slightly, she hears 6 beats/s. What is the frequency of string now.
A 92.0-kg astronaut and a 1200-kg satellite are separated from the space ship, and are both at rest with respect to the ship without any method of getting to the ship. how far away from the ship is the satellite
Two mirrors form a vertex with an angle of 128°. If a ray of light strikes mirror 1 with an angle of incidence of 48°, find the angle of reflection of the ray when it leaves mirror 2
Two cylindrical rods, one copper and the other iron, are identical in lengths and cross-sectional areas. What is the voltage between the ends of the copper rod
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