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Questions in physics

📝 Answered - Explain the following as applicable to: Lens Optical Centre Principal Focus Focal length

📝 Answered - What is the definition of acceleration? A. The change in velocity B. The change in speed C. The change in velocity divided by the time during which the change occurs D. The change in velocity multiplied by the time of change

📝 Answered - The formula [tex]$T=2 \pi \sqrt{\frac{L}{32}}$[/tex] relates the time, [tex]$T$[/tex], in seconds for a pendulum with the length, [tex]$L$[/tex], in feet, to make one full swing back and forth. What is the length of a pendulum that makes one full swing in 2.2 seconds? Use 3.14 for [tex]$\pi$[/tex]. A. 2 feet B. 4 feet C. 11 feet D. 19 feet

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - A circular observation window, 6 feet in diameter, is to be placed near the bottom of a pool 10 feet deep. Calculate the liquid pressure on the window. Hint: Density of water $=62.4 lb / ft ^3$. Round your answer to the nearest pound.

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - Compare the following. a. The distance from Neptune to the Sun is 4.55 x 10¹² m while the distance of the Earth from the Sun is 1.49 x 10¹¹ m. b. The size of a plant cell is 0.0001275 m while the size of a red blood cell is 7×10⁻⁶ m. c. The diameter of the Sun is 1.4 x 10⁹ m while the diameter of the Earth is 1.2746 x 10⁷ m.

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - A particle is moving in a straight line with a constant acceleration. It changes its velocity from 10 m/s to 20 m/s, while passing through a distance of 135 m in t seconds. The value of t is: (a) 10 (b) 1.8 (c) 12 (d) 9

📝 Answered - Convert the following masses into kilograms. a) [tex]50475 rg[/tex] b) [tex]406 dg[/tex]