A slide projector is set up with its lens 6.0 m from the screen. The projected image on the screen is 1.5 m square for a slide (the object) that is 2.5 cm square
(a) How far is the slide from the lens? (b) What is the focal length of the projector lens?
(a) 10 cm (b) 9.8 cm
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How far from a +50-mm focal length lens, such as is used in many 35-mm cameras, must an object be placed so it will form a real image that is 3.0 times the size of the object?
A) 46 mm B) 52 mm C) 58 mm D) 67 mm
Suppose you use the Southern Cross to determine that the south celestial pole appears 40 degrees above your horizon. Then you must be located at
A) latitude 40 degrees north. B) latitude 50 degrees south. C) latitude 40 degrees south. D) longitude 40 degrees.
A flatbed truck is carrying a load of timber which is not tied down. The mass of the timber is 800 kg. The maximum frictional force between the truck bed and the load is 2400 N
What is the highest acceleration that the truck can have without losing its load?
A solid steel ball is dropped from a great height and when its speed reaches 20 m/s its acceleration downward is 7.35 m/s2 . What would be the terminal velocity in this situation?
a. 80 m/s c. 40 m/s b. 60 m/s d. 20 m/s