According to the Big Bang theory, after the "Bang", the universe remained dark until about ___ later, when neutral atoms began form.

*three minutes

*one billion years

*300,000 years

*three billion years

Which waves are mechanical waves? A. microwaves B. sound waves C. light waves D. radio waves

Why are there rings on Saturn?

Why don't satellites in orbit fall to the ground? Why they don't fly off into space?

Find ur, the the energy dissipated in the resistor. express your answer in terms of u and other given quantities.

Because of friction, it required 6818.2 N to move a trailer 542 meters. How much work was accomplished?

A 2.25-kg block is released from rest on a ramp of height h. when the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 15.

Which of the following are steps for balancing chemical equations? Check all that apply. ] A. Multiply the reactants to get the products. B. Change subscripts. O C.

1. Why does the water vapour in clouds condense? 2. Explain why you can see clouds but not see the water vapour in the air

What are some similarities between electricity and gravity?

What's the difference between solids and liquids?