Emission lines are lines that are made when wavelengths of light are given off by cooling gases

True or false

How much energy is used by a 750 W microwave that operates for 6 minutes 30 seconds?

An astronaut drops a feather from 1.2m above the surface of the moon. If the acceleration of gravity on the moon is 1.6 m/s, how long does it take the feather to hit the moon's surface

804 n of force are applied to a 51.7 kg. What is the acceleration that the object experiences?

The fundamental frequency of an open organ pipe corresponds to B above middle C (493.9 Hz on the chromatic musical scale). The third resonance of a different closed organ pipe has the same frequency.

a 2,000-kilogram railroad car moving at 8m/s to the right collides with a 6,000-kilogram railroad car moving at 3m/s to the west. If the cars couple together, what is their velocity after the collision?

When a sailboat overtakes a powerboat, which vessel is the stand-on vessel?

Both matter and energy can eneter and exit which of the following systems? A. open only B. both open and closed C. isolated only D. both closed and isolated

1. Find the charge if the number of electrons is 4 x 10-18

Which of the following describes resistance force?

Ursa Minor contains the pole star, Polaris, and the asterism known as the Little Dipper. From most locations in the Northern Hemisphere, all of the stars in Ursa Minor are circumpolar.