Which of the following is a vector?

1. Distance

2. Mass

3. Frequency

4. Force

Room air at 23oC is heated by a 2000 W space heater with a surface filament temperature of 800 K. The room, at steady state, looses the power to the outside, which is at 7oC. Find the rate (s) of entropy generation and specify where it is made.

A yellow ball with a mass of 2 kg is rolling across the floor at 3 m/s. A red ball with a mass of 3 kg is rolling across the sam floor at 3 m/s. Which ball has a greater kinetic energy, and why?

What is cumulative force?

List the name and number of each element on both sides of this equation CH4+Cl2

That polaris will not always be the pole star is due to

How many earth years does it take mars to orbit the sun

Which represents a system that is almost completely closed?

If many household substances classify as acids or bases what is the ph scale

A protostar forms once the nebular cloud condenses and the core begins

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are