A crane lifts a 425 kg steel beam vertically upward a distance of 614.4 m How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s2? Neglect frictional forces.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?

What must occur for an object to have a perfectly circular orbit? an object must have enough velocity to create exit velocity. an object must have enough gravity to orbit in a circle. an object must have the exact mass to orbit in a circle. an object must have the exact velocity to orbit in a circle.