What are the uses of evaporative salts? to ignite methane and other flammables to preserve foods, dye fabric, and de-ice roads to produce bacteria for decomposition to make paint, lacquer, and cleaning products

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

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?