How do we determine the amount of dark matter in elliptical galaxies?

America's first satellite launched in space was called explorer i luna i beagle i.

A man on a beach measures 2 seconds and 5 meters between two crests. what is the wave speed?

Receiver Questions: 1) Going back to the idea of a plane before take off. Why was the sound of the engine louder when it goes from low to high power goes from low to high power?

To calculate the density of an object, which of the following values do you need to know? A. Volume B. Buoyancy C. Weight D. Mass

Calculate the average speed (in m/s) of a cheetah that runs 140 meters in 5 seconds

Formulas (equations) : A = 3x and B = 5x + 1 As x increases, does A or B go up faster? if x=0, then A=? if x=1 then B=?

Sound travels 2146 m through a material in 1.4 seconds. What is the material?

What two pieces of data indicates that uranus resides in the outer layer of the solar system.

What is acceleration? a. change in velocity/change in time b. change in distance/change in time c. change in mass/change in volume d. change in pressure/change in time

Brittany stands at rest on a skateboard. the combined mass of brittany and the skateboard is 62 kg. dave tosses a 3.7-kg pumpkin to brittany, and when she catches it, she and the skateboard begin to roll backward with a speed of 0.16 m/s.