Simon and his friends are standing on a bridge. Simon's friends gently toss pebbles off the bridge. In contrast, Simon throws a pebble straight down. Which of these graphs best represents the velocity of Simon's pebble as a function of time (t), with t = 0 representing the moment that the pebble left Simon's hand?

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

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?

Apropagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum. determine the term.