All engines operate at less than 100 percent efficiency because they

A. absorb heat

B. conduct heat

C. burn gasoline

D. emit heat

Q. Describe the motion of a rocket on tha basis of equation of continuity.

Radium-226 is unstable. What is the process that allows the nucleus of radium-226 to become more stable? Question 14 options: A. ionic bonding B. radioactive decay C. hydrogen bonding D. covalent bonding E. nuclear fusion

The cause of a fire in a computer is described as an incorrectly wired circuit. Which statement best explains the likely cause of the fire? The wiring contained a short circuit, so the reduced resistance caused an increase in current.

A skier is skiing down a slope on the mountain. Is the mechanical energy conserved? Why or why not? The mechanical energy isn't conserved. Some energy is lost to gravity. The mechanical energy isn't conserved. Some energy is lost to friction.

If you are involved in any type of collision, it is important you

A flashlight beam strikes the surface of a pane of glass (n = 1.50) at a 61° angle to the normal. what is the angle of refraction?

Why is there controversy to the opinion that human contribution of carbon dioxide to the atmosphere is cause warming

If the resistance of a circuit increases, that means that the current has to

One watt is equal to which of these values? 1 joule/hour 1 joule-hour 1 joule/second 1 joule-second

What are some of the benefits of learned optimism that have been found in research? O A. Fewer health problems O O B. All of these C. Making more money O D. A lower divorce rate