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The combination of the cornea and the crystalline lens shown below serves as a converging lens. In a perfectly functioning eye, an image is projected at a fixed distance on the retina, which is approximately 2cm from the lens. What…
A woman stands 1m in front of a plane mirror. What is the magnification and distance from the woman to her mirror-image? 1/2 and 2m 1 and 1m 2 and 1m 1 and 2m Click for Explanation A flat plane…
A beam of light is traveling through air (n = 1) when it passes through a transparent glass (n = 1.5) medium. Which of following is true concerning the angles θ and the velocity V? A. θ1 > θ2 and…
The fundamental wavelength of a standing wave in a 1 meter long pipe, if the pipe has one open end and one closed end is: A. 4m B. 1m C. 2m D. 4/3m Click for Explanation Standing waves consist of…
A 10-cubic-cm cork floats in water with 1/2 of its volume submerged. Approximately what fraction of the cork’s volume will be submerged when in mercury (specific gravity = 13)? A. 1/20 B. 1/2 C. The cork will completely submerge because…
The voltage drop across Rd is 8 V. What is the current across Re? A. 2 A B. 8 A C. 14 A D. 32 A Click for Explanation This problem requires 3 electrical circuit concepts: 1) V = IR,…
At a depth of 5 meters, the pressure in a tank of water is equal to 1.5 atm. What is the pressure at a depth of 20 meters? A) 3 atm B) 4 atm C) 5 atm D) 6 atm…
A child’s flotation device (ρ = 250 kg / m3) is held underwater at the beach (ρseawater = 1025 kg / m3). The toy is spherical and has a radius of one meter. When the toy is released, what is…
Why are the doorknobs of most doors placed on the edge of the door, opposite the hinge where the door is attached to the doorframe? A) Placing the doorknob as far as possible from the door’s center of gravity helps…
A child pushes, with F1, his sister on a swing, generating torque, τ1 which causes her to swing forward. If he then gets in a swing that hangs on a chain that is 20% shorter and his sister pushes with…