7. A force of 11 N is applied to the handle of a screwdriver being used to pry off the lid of a paint can. As the input force moves through a distance 0.3 m, the screwdriver does 3 J of work on the lid.

What is the efficiency of the screwdriver?

27%

91%

9.1%

11%

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates