The ratio of output power to input power, in percent, is called

A. conductivity.

c. work.

B. efficiency.

d. horsepower.

Juan aims his boat directly across a river flowing at 8mi/hr. juan's boat travels at 6 miles/hr in still water. how was does juan travel relative to shore

Who is credited with popularizing the geocentric model of the solar system? brahe copernicus newton ptolemy

1 give reason A. melting of snow can both be a desirable and undesirable change b. appearance of hailey comet once every 72 year is a periodic change

The cunninghams are moving across the country. Mr. cunningham leaves 2.5 hours before mrs. cunningham. If he averages 40 mph and she averages 65 mph, how long will it take Mrs. cunningham to overtake mr. cunningham?

What part does infiltration play in the water cycle?

How many layers of material were the roads made of? a. two c. four b. three d. five

Red light has a shorter wavelength than yellow light.

Approximately what is the parallax angle of a star that is 20 light-years away?

If the Earth and distant stars were stationary (motionless) in space, what would we observe about the wavelength from these stars? A. Wavelengths measured would match the actual wavelengths emitted. B.

Two fire trucks with sirens speeds towards and away from an observer. Which statement is true involving the Doppler effect observed by the observer?