Which was least likely to have been a component of Earth's atmosphere before life began?

A-sulfur

B-carbon dioxide

C-oxygen

D-water vapor

He force between two long parallel conductors is 15 kg/metre. the conductor spacing is 10 cm. If one conductor carries twice the current of the other, calculate the current in each conductor.

You can tell the difference between positively charged and negatively charged particles by passing them through an electrical field; the positively charged particles are repelled from the negatively charged particles are attracted to it 1. True 2.

An object on the surface of the earth has a force of gravity of 682 N. What is the objects mass?

A ball falls for 9.0 s increasing its kinetic energy by 2700. If the force acting on the ball in 6.0 N find the following quantities: Change in velocity: Average velocity: initial velocity: Final velocity: Initial momentum: Final momentum:

Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. state your assumptions, such as the mower moves with a 1 km/hr speed, and has a 0.5 m width.

A train travels 80 kilometers in 2 hours, and then 79 kilometers in 4 hours. What is its average speed?

What does it mean when we say science is a cycle?

1) Which is a characteristic of a metal? A) It looks dull. B) It feels brittle. C) It is a good insulator. D) It is a good conductor of electricity. 2)

1:a boy 2 a girl pulling a heavy crate at the same time w/10 unite of force each. What is the net force acting on the object

Animals that can hear ultrasonic sounds are the what