Which of the following is an example of a contact force? A magnet repelling another magnet without touching it A ball falling the ground when it is dropped A child pushing a toy car Gravity keeping the earth in order around the sun

A 13.0 μFμF capacitor is connected to a power supply that keeps a constant potential difference of 24.0 VV across the plates. A piece of material having a dielectric constant of 3.

A high-jumper, having just cleared the bar, lands on an air mattress and comes to rest. Had she landed directly on the hard ground, her stopping time would have been much shorter.

How are the current and resistance related when the voltage of a circuit is constant? the current doubles when the resistance doubles because they are directly proportional.

The average car today has a mass of 1510 kg, and when starting from rest, can accelerate to 26.8 m/s in 6.10 seconds. what force, in newtons, is accelerating the car?

What happens when the temperature of a substance is slightly decreased? A) the atoms within the substance move more rapidly. B) the atoms within the substance stop moving. C) the atoms within the substance move more slowly.

An object has an acceleration of 24 m/s/s. How long would it take the stationary object to reach a velocity of 6.8 m/s?

What is normal distribution in statistics?

Which of the following water samples would be considered acidic

A linearly-polarized electromagnetic (EM) wave has an electric field with amplitude 1000 V/m. You hold a a linear polarizer in front of it and rotate the polarizer so that all of the EM wave is blocked. You then rotate the polarizer 30 degree.

Let y'=4 x. find all values of r such that y = rx^{2} satisfies the differential equation. if there is more than one correct answer, enter your answers as a comma separated list.