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.

If 200 J of work is peformed by a tool in 20 seconds what is the power of the tool

Sound is a disturbance that travels through a medium as a

How much heat is needed to melt 18.50 kg of silver that is initially at 17 ∘C?

In science work is defined as

What is power in physics

Approximately how many kelvins are equal to 60 c? a. 289k b. 323k c. 333k d. 413k

What are two ways to change velocity?

What is the main optical element of a refracting telescope?

Two water manometers are connected to a tank of air. One leg of the manometer is open to 100kPa pressure (absolute) while the other leg is subjected to 90kPa. Find the difference in deflection between both manometers, Delta h_a - Delta h_b.

Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, throwing up so much dust that the sun was blocked out for a period of many months. A.