A parent swings a 11.5 kg

child in a circle of radius

0.711 m, making 12 revolutions

in 27.4 s. How much force does

the parent exert on the child?

(Unit = N)

A woman is reported to have fallen 161 ft from a building, landing on a metal ventilator box, which she crushed to a depth of 29 in. She suffered only minor injuries.

Two similar metal spheres, A and B, have charges of + 2.0 x10 - 6 coulomb and + 1.0 x10 - 6 coulomb, respectively, as shown in the diagram below. What is the charge on each sphere after the spheres make contact and are then separated?

Which statement describes the function of control rods? They release neutrons during fission reactions. They undergo nuclear fission reactions. They control the rate of reactions. They directly convert water to steam.

Each railway car has a mass of 12,000 kg. Before the cars collide, the car on the left has a speed of 32 m/s. What is the magnitude of its momentum?

The first simple, one-celled organisms that developed during the Precambrian era are called

When viewing a piece of art that is behind glass, one often is affected by the light that is reflected off the front of the glass (called glare), which can make it difficult to see the art clearly.

force used to lift a 25kg mass to a height of 24m in 5 sec does 2120J of work. Calculate the power.

Which statement is true about the atom? A: it contains positive electrons, uncharged protons and negative protons. B: it contains uncharged neutrons, positive electrons and negative protons.

Steel objects can become temporary magnets because they are mainly composed of which element?

How long does it takes the sun to rotate the earth?