Which of the following is an example of a variable ratio schedule? 1, Giving a student $10 when you believe that he/she has earned "enough" A's.

2,Giving a student $10 for every A that he/she earns.

3,Giving a student $10 for any grade that he/she earns.

4,Giving a student $10 immediately after earning an A.

An input force of 7 n is applied to a machine with a mechanical advantage of 1.75. what is the maximum the machine could lift? 12.25 n7n7.25 n26.2 n

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction