Scientists discovered that stars in the universe are mostly composed of which elements? a. hydrogen and helium

b. hydrogen and oxygen

c. oxygen and nitrogen

d. helium and nitrogen

What happens to energy of light if the weave length decreases

A certain copper wire has a resistance of 10.5 ω. at what fraction of the length l must the wire be cut so that the resistance of one piece is 9.0 times the resistance of the other?

What is the acceleration of a 0.90g drop of blood in the fingertips at the bottom of the swing?

Using Hooke's law, F s p r i n g = k delta x, find the force needed to stretch a spring 2 cm if it has an elastic constant of 3/Ncm A:2/3 N B:3/2N C:3N D:6N

Our boss asks you compare two sound waves and determine which has the higher frequency. Wave A has a period of 4⁄100 second and Wave B has a perio of 1⁄7 second.

The period of a 440 Hertz sound wave is __ seconds. 1/440 1/220 220 440

Match the term to the correct description. ~A type of circuit where part of the loop is broken. ~The flow of electrons. ~A loop that creates a pathway for electricity to follow. ~A type of circuit with only one path for the electricity to follow.

What is the mass of an object that is accelerating at 10 m/s^2 when a force of 2,386 N is exerted

According to the U. S. Green Building Council, what percentage of the world's energy use and greenhouse gas emissions can be attributed to buildings?

Magnets are often fitted to the doors of refrigerators and cupboards WHY?