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In a skating stunt known as "crack-the-whip," a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 58.0 kg and is 7.80 m from the pivot. He is skating at a speed of 6.40 m/s. Find out the magnitude of the centripetal force that acts on him.
An oil drop carries one excess electron and weighs 9.3 x10-15 N. What electric field strength is needed to suspend the drop so it is motionless.
You're carrying a 3.2-m-long, 25 pole to construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 from its tip. How much force must you exert to keep the pole motionl..
A small fly of mass 0.27 grams is caught in a spider's web. The web vibrates predominately with a frequency of 4.50 Hertz. What is the value of the effective spring constant stiffness constant for the web.
When you push a 1.95kg book resting on a tabletop it takes 2.50N to start the book sliding. Once it is sliding, though, it takes only 1.50N to keep the book moving with constant speed. What are the coefficients of static and kinetic friction betwe..
Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of +8q. Sphere B carries a charge of -q. Sphere C carries no net charge. Spheres A and B are touched together and then separated.
A tennis ball is thrown toward a vertical wall with a speed of 22.0 m/s at the angle of 40.0° above the horizontal. The horizontal distance between the wall and the point where the tennis ball is released is 28.0 m.
what is the electric force between the proton and electron inside of a hydrogen atom? What must the speed of the electron be? Radius=0.47 x 10^-9.
How many kilometers per liter will a car obtain if its engine is 25 percent efficient and it encounters and average force of 1000 Newtons? Suppose the energy content of gasoline is 40,000,000 joules per liter (J/L).
The brick wall of a building has dimensions of by and is thick. How much heat ?ows through the wall a period when the average inside and outside temperatures are, in that order.
What is the speed of the second asteroid? Now suppose that the first and second asteroids carry charges of 3.68 C and -3.68 C, respectively. How fast would the second asteroid have to be moving in order to occupy the same circular orbit as before?
assume the roller coaster (h1 = 37 m, h2 = 13 m, h3 = 30) passes point A with a speed of 3.10 m/s. If the average force of friction is equal to one third of its weight, with what speed will it reach point B? The distance traveled is 55.0 m.
find the initial velocity of the ball. An echo is heard in 3 sec after the emission of sound. If speed of sound in air is 342 m/s, what is the distance of the reflecting surface from the source.
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