A turn on a racetrack is 915 meters long and can be considered a semicircle with a radius of 291 meters, as shown in the diagram below. 291 m
915 m
What is the centripetal acceleration of a car that completes the semicircular tur at a constant speed in 15.0 seconds?
Ooms
3.14 m
12.8 ms
610 m

Why does the input force have to be greater than the force needed to lift the bale?

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?