What is the equation for calculating a machine's efficiency?

I searched all over my textbook and couldn't find it, so I decided to post my question here.

10. A frog leaps from its resting position at the lake's bank onto a lily pad. If the frog has a mass of 0.5 kg and the acceleration of the leap is 3 m/s2, what is the force the frog exerts on the lake's bank when leaping? a. 0.2 N b. 0.8 N C. 1.

One proven risk of GM crop is? a. the escape of GM genes into non-GM crops. b. the risk of cancer associated with eating GM food. c. increased resistance of insects to pesticides because of the pesticides resistance of GM crops. d.

Some people believe children are born like a blank slate and that everything they are is a result of their environment and what they learn. This concept is called: O A. nature versus nurture. O B. environmental impact theory. O C. cogito ergo sum. D.

Push is a force but is pull a force?

What are the things on top of the titanic called?

You have a 60-foot roll of fencing and a large field. You want to make two paddocks by continuing the fencing down the middle of a rectangular enclosure. What are the dimensions of the largest such enclosure you can make?

Crystallization is a separation technique used to produce rock candy from a sugar solution. true or false

A car traveling in a straight line has a velocity of 3.79 m/s at some instant. After 5.4 s, its velocity is 11.9 m/s. What is its average acceleration in this time interval? Answer in units of m/s 2

The periodic law states that elements that have similar properties appear ... a. to the left of each other b. to the right of each other c. at every 10th element d. at regular intervals

An expert archer tried to shoot an arrow into a target lying at the bottom of a shallow pool. Even though the water did not change the direction of the arrow, the archer missed the mark by several inches.