A machine has an efficiency of 70%. How much work dose the machine do when 20,000 J of work is done on it?

Orbit around hub and arms of spirals (with name)

How much heat is needed to raise the temperature of 8g of water by 20oC?

When steam condenses 1. All of these occur. 2. None of these occur. 3. molecules move closer together. 4. it changes from the gas phase to the liquid phase. 5. it gives off heat.

Information related to the organisms found on earth during various geological time periods is represented in the chart below. Which statement concerning the organisms represented in this chart is correct.

The length of days and nights at any location on Earth depends on the Earth's position with respect to the sun. Sydney is at latitude 34°00'S.

The bodies of birds are streamlined. Why. When we strike a matchstick with a rough surface it catches fire. why Grooves are made in tyres. why Discuss how friction plays a vital role in daily life.

What will be the force if they are moved so they are only one-eighth as far apart?

NaBr + H3PO4 = Na3PO4 + HBr

Which example describes constant acceleration due only to a change in direction

A roller coaster car travels up and down the hills of its track. Neglecting friction, the sum of its kinetic and potential energy A. equals the sum of the thermal energy generated by friction during the ride. B.