Aheat engine takes in 6.45 × 103 j of thermal energy from a reservoir at 600 k and returns some of this energy to a reservoir at tl < 600 k .part aif this engine operates at an efficiency of 0.430, what is the maximum value possible for tl?

Describe the path of the electric current through a circuit?

Write the correct abbreviation for each metric unit

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?