A small, private airplane is carrying three passengers to an island. The plane is 0.9 km in the air. If the potential energy of the plane and its three passengers is 48,510,000 J, what is the combined mass of the plane and its passengers? Round your answer to the tenth place.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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?

He latent heat of vaporization for ethyl alcohol is 854 j/g. the amount of energy, rounded to the nearest whole number, needed to change 5.20 grams of ethyl alcohol from a liquid to a gas is