How o astronomers gather information to establish the hubble law?

Which of these is a contact force? A. earth's attraction of the moon B. force of a magnet that attracts paper clips C. force of a bat on a baseball

A cross-country skier can complete a 7.5km race in 45min. What is the skiers average speed?

How could the Doppler Effect have assisted you with this investigation?

It was a dark and stormy night, when suddenly you saw a flash of lightning. five-and-a-half seconds later you heard the thunder. given that the speed of sound in air is about 340 m/s, how far away was the lightning bolt?

The glass is attracting the pieces of paper. What does this tell you about the charges on the glass and the paper? The glass and the paper have the same charge. O The glass and the paper have different charges.

Sheila lives in the seashore community of Beachview. At 6:00 a. m. one morning, she noticed that the local ocean water was at high tide. At approximately noon that same day, she noticed the water was at low tide.

How many pounds are in 427.06 g? 1 gram = 2.20 * 10-3 lb A. 194,118 lb B. 194.12 lb C. 939 lb D. 0.939 lb

Identify the possible source of earth's magnetic field

A nurse applies a horizontal force of 147 N on a bed that has a mass of 152 kg, The magnitude of the normal force acting on the bed is .967 N 5.00 N 1440 N 1490 N

What do scientists use to look at cells, tissues, and small organisms to see how their biological processes differ in space? vibration flybys airlock microgravity