How much heat is required to warm 230 g of water from 12°C to 90°C? (Specific Heat of Water = 4.184)

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

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?