You swing a 2.2 kg stone in a circle with radius 75 cm. At what speed do you need to swing it so its centripetal acceleration will be 9.8 m/s?

2.7 m/s

8.6 m/s

27.1 m/s

7.35 m/s

How long does it take to cook potatoes in a pressure cooker?

If you perform 10 joules of work lifting a 10-N box from the floor to a shelf, how high is the shelf? A. 1 m B. 2 m C. 10 m D. 100 m

Justin Bieber is thrown horizontally at 10.0 m/s from the top of a cliff 122.5 m high. How long does it take to reach the ground? What is the horizontal displacement? What is Justin's final velocity?

Which kind of radio waves are used by television stations to carry sound?

If cable cb is subjected to a tension that is twice that of cable ca, determine the angle u for equilibrium of the 10-kg cylinder. also, what are the tensions in wires ca and cb?

What is the kinetic energy of a 1,900 kg car moving at 89 km/h?

Why do we study black holes

Calculate the kinetic energy of a charging elephant if its mass is 5,000kg and it moves at 8m/s

Why is a decrease in Earth's ozone harmful to life?

What force does a window washer want acting on him when trying to keep the same position