Explain how machines can be useful if the output work is always less than the input work

How can the rate of the reaction be increased?

Which is the most accurate name for the ionic compound CaS?

A 920 kg sports car collides into the rear end of a 2300 kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 3.3 m before stopping.

A sled with a mass 53.0 kg is pulled along flat, snow-covered ground. the static friction coefficient is 0.30, and the kinetic friction coefficient is 0.10. (a) what does the sled weigh? 519.

Which block has more thermal energy? if the blocks are placed in thermal contact, will the thermal engery of the blocks change?

An experiment is performed to obtain the value of a physical property. If the true (i. e., correct) value of the property is 50 and the measured (i. e., experimental) value is 32, the percent error of the experimental result is:

White moths were found in huge numbers in the city of Birmingham. These moths could be easily camouflaged by the trees. Because of sudden industrial development, the trees in the city were covered with soot.

What two factors determine how fast weathering occurs

A sound that's produced by a single wave at a constant frequency and with no overtones is called

Which of the following is ignored when determining the relative mass of atoms? protons nucleus electrons. neutrons