Why is combustion of fuel necessary for heat engines to do work?

Which element has 24 protons

Last question of the day Predict what will happen to the sun, the solar system, and the milky way in billions of years

Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.

A proton moves through a region of space where there is a magnetic field B = (0.45i + 0.38j) T and an electric field E = (3.0i - 4.2j) X 10^3 V/m. At a given instant, the proton's velocity is v = (6.0i + 3.0j - 5.0k) X 10^3m/s.

The Moon has too little iron, Mercury too much. How can both of these anomalies be the result of giant impacts? Explain how the same process can yield such apparently contradictory results.

What do nuclear fission and nuclear fusion have in common?

When plug prongs are connected to the metal case of an appliance, a part that should always be placed next to the case is a a. flat metal washer. b. hexagonal aluminum shoulder. c. steel nut. d. mica washer.

For a constant voltage, increasing the resistance will cause the current to decrease

Soils are made up of mineral portion an organic portion air and water what is meant by the word organic Nonliving mineral in composition Composed of several organs Material that was produced by or was/is part of living organism Musics in nature

A car is traveling at 42.0 km/h on a flat highway. (a) If the coefficient of friction between road and tires on a rainy day is 0.107, what is the minimum distance in which the car will stop?