A child on a spinning ride at a playground has a centripetal acceleration of 0.80 m/s2. The child completes a full circle every 4.2 s.

How far from the center of the ride is the child?

0.068 m

0.085 m

0.27 m

0.36 m

Unlike a phonograph record that has a constant angular speed, a CD scans information at a constant linear speed (130 cm/s). Does a CD therefore rotate at a constant angular speed, or varying angular speed?

Which pair of elements is most similar? Na and CI Li and Ne Co and Ne and Ar

A swimmer swims 40 miles in 80 seconds. What is the swimmer's average speed?

A radar station detects an airplane approaching directly from the east. at first observation, the range to the plane is d1 = 354 m at 40° above the horizon.

An isotope has a half life of 2 days. After 6 days, how much of the original material is left? A. 12% B. 12.5% C. 30.2%

What is the impulse on a car (750 kg) that accelerates from rest to 5.0 m/s in 10 seconds

Which statements correctly describe the effect of distance in determining the gravitational force and the electrical force? Check all that apply. The gravitational force has an infinite reach. The electrical force has an infinite reach.

Why does your mouth water when you smell food

What two things can happen in the life of a massive star after it passes from the supernova stage?

Check the boxes that correctly complete this statement. All isotopes of an element B) have the same number of protons. C) have the same atomic number.