What element are the cores of massive stars made of when a supernova occurs?

a. silicon

b. iron

c. oxygen

d. neon

An experimental vehicle slows down and comes to a halt with an acceleration whose magnitude is 9.80 m/s2. after reversing direction in a negligible amount of time, the venicle speeds up with an acceleration of 9.80 m/s2.

Which of the following is not a primary cause of eroding rock

A ball is launched directly in the air at a speed of 40 feet per second from a platform located 10 feet in the air.

Metal sphere A is hung from the ceiling by a long, thin string and given a positive charge. An identical sphere B is suspended nearby with an identical string and given a negative charge that has the same magnitude as the charge on A.

A motorist is traveling at 20 m/s. He is 60 m from a stoplight when he sees it turn yellow. Is reaction time, before stepping on the brake, is 0.50 s. What steady acceleration (slowing down) while braking will bring him to a stop right at the light?

When Cannon and Washburn measured stomach contractions with a balloon, they found that?

An astronaut weighs 104 newtons on the moon, where the strength of gravity is 1.6 newtons per kilogram. What would she weigh on Mars?

A chemical bond formed when Adams share three pairs of electrons is A. an ionic bond B. a single bond C. a double bond D. a Triple bond

A 1100 kg car rounds a circular turn of radius 24.6 m. Of the road is flat and the coefficient of static friction between the tires and the road is 0.59, how fast can the car go without skidding

What is the momentum of a 15 kg tire rolling down a hill at 3 m/s? 5 kg • m/s 18 kg • m/s 45 kg • m/s 60 kg • m/s