the useful power out of an electric motor is 20w and the total power into the motor is 80w calculate the percentage efficiency of the motor

Because of its energy of motion when a vechle speed double the vechle needs about

When all global earthquake locations over the last 10 years are plotted on a map, they are concentrated along continental borders tectonic plate boundaries the equator areas within 50 miles of an ocean?

Which of the following is a poor conductor of heat?. A. silver. B. aluminum. C. gold. D. copper. E. air. How can you tell the difference if its a poor conductore or not? o. o

You ride your bike from home to school, covering a distance of 3 km in 15 min. what is your average speed in km/h?

In which region of the periodic table do the elements NOT normally react chemically with other elements? A. metals B. metalloids C. nonmetals D. noble gases

Leanne is riding a bike. The forward force from her pedalling is 18N. There is a backward force of 6N from friction and a backward force of 12N from air resistance. Does the speed of the bike increase, decrease or not change?

How are energy and speed related

11. Which of the following best explains velocity? A. The direction of an object in motion B. Only the change of direction of an object in motion C. The speed and direction of an object in motion D. The speed of an object in motion

Using 6400 km as the radius of Earth, calculate how high above Earth's surface you would have to be in order to weigh 1/16th of your current weight. Show all work leading to your answer OR describe your solution using 3 - 4 complete sentences.

Which of these could occur if a switch is closed? A. A light bulb will light up. B. A hair dryer will turn off. C. A computer will shut down. D. B and C