What is the primary visible color of an emission nebula?

Explain Kepler's laws

Moon phases are named after the shape the moon resembles during that time. What is is called when the shape of the moon is between a half circle and a full circle. crescent semi-full three-fourths gibbous

An electric refrigerator rated 400 W operates 8 hours a day. Find the energy used per day in KWh.

A fisherman is watching water waves ripple past his boat. How could he determine the wavelength of the water waves?

A box moves to the right along a rough, wooden surface. In which direction does the box experience a frictional force?

Wave can be described as A. a continuous transmission of energy from one location to the next B. The disturbance of particles in an area C. The transmission of energy through individual particles D. The motion of particles in a medium

A germ is also called a microorganism or a microbe. True False

What is 1.33Ω plus 2Ω?

As a fire truck approached Mary, the pitch of the siren got higher. once the fire truck passed and moved away, the sirens pitch got lower. this change in pitch is because in the sound waves

Find the magnitude of the sum of these two vectors