When using a film camera, what must you do to bring an object into focus?

a. move the lens toward or away from the film.

b. close the diaphragm.

c. adjust the speed of the shutter.

d. adjust the angle of the mirror.

The ratio of output power to input power, in percent, is called A. conductivity. c. work. B. efficiency. d. horsepower.

What factor affects sensation?

A bolt drops from the ceiling of a train car that is accelerating northward at a rate of 2.15 m/s2. (a) What is the acceleration of the bolt relative to the train car? (b) What is the acceleration of the bolt relative to the Earth?

Which types of heat transfer that allows heat to flow from hot objects to colder object? A. convection, but not conduction or radiation B. convection, conduction, and radiation C. convection and radiation, but not conduction D.

Fleas have remarkable jumping ability. a 0.60 mg flea, jumping straight up, would reach a height of 40 cm if there were no air resistance. in reality, air resistance limits the height to 20 cm.

What do the group numbers mean on the periodic table?

A spring supporting a mass of 30 kg compresses 0.6 m. How far does the spring compress when it supports a mass of 10 kg? A. 0.1 m B. 0.2 m C. 1.2 m D. 1.8 m

Which statement best describes a solid?

Race car drivers must slow down as they make turns on the track. This is best explained by the law of inertia. Which statement best describes inertia for the car going around a turn? A) A body in motion stays in motion at the same speed.

What is is the ratio of the distance over which the force is applied to the distance over which the load is moved