What is the formula for calculating the efficiency of a heat engine

The fastest helicopter, the Westland Lynx, can travel 3.33 x 103 m in the forward direction in just 30.0 s. What is the average velocity of this helicopter?

How does electricity flow? a) from low potential to high potential b) from high potential to low potential c) from series circuit to parallel circuit d) from conductor to insulator

When using a can opener what input force is involved? What is the output force?

The Sun is 92,960,000 miles from Earth. what is the distance between the Sun and Earth in kilometers? What is the distance in light-years?

A hot air balloon has a mass of 300 k gincluding the basket. The hot air inside the balloon weighs 17,000 N. Determine the maximum load that the balloon is able to lift displaces 25,000 N of cold air. Use 10 m/s 2 for gravity.

A ball is dropped from an initial height and allowed to bounce repeatedly. On the first bounce (one up-and-down motion), the ball reaches a height of 32 inches. On each successive bounce, the ball reaches 75% of its previous height.

An inductor with an inductance of 3.50 H and a resistance of 8.00 Ω is connected to the terminals of a battery with an emf of 4.00 V and negligible internal resistance.

An example of a decomposition reaction is A. AB>A+B B. AX+B>A+BX C. A+B>AB D. AX+BY>AY+BX

An example of sunlight passing through clouds during sunset, results in what is often called the cloud's silver lining. Pastel shades of blue, pink, purple, and green can be observed at times of cloud cover.

An observer on Earth measures the length of a spacecraft travelling at a speed of 0.700c to be 78.0 m long. Determine the proper length of the spacecraft.