A slide projector needs to focus the image of a 24.0-mm × 36.0-mm slide onto a square screen 1.50 m on each side. You want to fill the screen as completely as possible without any of the image falling beyond the screen
Due to space constraints in the projector, the slide must be placed 10.5 cm from the lens. (a) What magnification does the projector produce? (b) How far from the lens should the screen be placed? (c) What focal length projector lens is needed?
(a) 41.7, (b) 4.38 m, (c) 10.3 cm
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A block is on a frictionless horizontal table, on earth. This block accelerates at 1.9 m/ when a horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s2
What is the weight of the block on the moon? A) 77 N B) 67 N C) 58 N D) 48 N E) 39 N
A 5000-W resistor and a 50-mF capacitor are connected in series at t = 0 with a 6-V battery. The capacitor is initially uncharged. What is the current in the circuit at t = 0? At t = 0.5 s? What is the maximum charge stored on the capacitor?
For a particular process involving seven variables or parameters having four fundamental dimensions, how many dimensionless numbers can be formed?
What will be an ideal response?
First Law of Thermodynamics: An expandable container holds 2.30 mole of helium, He, gas with an initial pressure of 770 kPa and an initial volume of 2.10 L. The gas expands isothermally to a final pressure of 350 kPa. How much heat is gained by the gas during this process? (R = 8.31 J/mol ? K)
A. 1280 J B. 792 J C. 685 J D. 1370 J E. 1700 J