Acar drives to the east in a time of 4 hours. then, immediately (not realistic, but just assume this is the case for this problem), travels 12 km to the west in 4 hours. the average speed for the entire trip is 5 km/hr. what is the average speed of the car for the first part of the trip, in km/hr, while the car was traveling east?

The discovery that the universe appears to be expanding led to a widely accepted theory called a.) the big bang theory b.) the doppler effect c.) hubble’s law d.) solar nebular theory e.) the seyfert theory

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?