A log with a mass of 15 kg is on free fall from the top of a mountain. When it is at a height of 28 m from the ground level, it has a velocity of 70 m/s. a. What is its mechanical energy at this position?

A small gasoline engine can put out 24,000 n-m/min of mechanical power. the engine is used to drive an electrical generator that is 70 percent efficient. 1 n-m = 2.78 x 10-4 w-h. find the output of the generator in watts.

What causes the balloon to move along the string?

Which would be most useful for overcoming the disadvantage of using ores?

Describe the relationship of the Earth's lithosphere to the asthenosphere.

If a car takes a banked curve at less than the ideal speed, friction is needed to keep it from sliding toward the inside of the curve (a real problem on icy mountain roads).

A Cadillac Escalade has a mass of 2,569.6 kg, if it accelerates at 4.65 m/s^2 what is the net force on the car?

If you are trying to balance a seesaw and you have a higher mass on the left, should the mass on the right be placed at a greater distance or lower distance to balance it? Why?

A car travels 300 km in the first 3 hours of a trip. Then it hits traffic and travels only 60 km during the last hour. What is the average speed of the car? a.) 180 km/h b.) 100 km/h c.) 90 km/h d.) 120 km/h

What is the purpose of using a wedge? A. separates objects B. keeps objects together C. allows you to exert force over a distance

Echolocation is an acoustic principle in which some wildlife use resonance to find food at night. Question 25 options: True False