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Cara George
A damped harmonic oscillator loses 6.0% of its mechanical energy per cycle.

a. by what percentage does its frequency (equation 14-20) differ from its natural frequency?

b. after how many periods will the amplitude have decreased to 1/2 of its original value?
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Ozzy
What element will form an ionic bond with carbon
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Sariah Duarte
State the condition for maximum current to be drawn from the cell
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Max Dyer
Anti-reflective coatings on lenses use thin-film interference to eliminate the reflection of a particular color. Suppose a glass lens (ng = 1.53) is covered with a thin film (nf = 1.31) to prevent green light (λ = 534 nm) from being reflected.

(a) write an expression for the minimum thickness the film can have, t.

(b) Calculate the minimum thickness, t, in nanometers?
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Diego Meadows
Light incident on a surface at an angle of 45 degrees undergoes diffused reflection. At what angle will it reflect?
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Reginald Irwin
A ship on the surface of the ocean receives a sonar echo back from an underwater object. The echo path from the object to the ship is at an angle of 35 degrees above the horizontal and takes 3s to return. (Velocity of sound in sea water = 1500m/s). a) What is the distance of the object from the ship? b) What is the depth of the object in the sea?
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Rory Mcneil
A wave has a speed of 6 m/s and a wavelength of 12 m. What is the frequency of this wave?

a. 2.0 Hz

b. 0.5 Hz

c. 18 Hz

d. 72 Hz
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Blondie
What is the acceleration of a body revolving in a circle at uniform speed?

A. The acceleration is zero.

B. The acceleration is directed tangentially.

C. The acceleration is directed toward the center.

D. The acceleration is directed away from the center.
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Tilly
What volume is occupied by 2.35 moles of he at 25 degree c and a pressure of 0.980 atm?
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Krystan
3. A stone is thrown upward at an angle. What happens to the horizontal component of its velocity as it rises
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Silver
An arc welder provides 250A of current when operating with a voltage of 40V. What is the power required by this welder? Explain your answer.
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Flake
How do you say scuba dive in spanish
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Monserrat
a boy hears the echo of his own voice from a distance hill after 0.8 seconds. If the speed of sound in air is 340m/s, calculate the distance of the hill from the boy.
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Yadiel Zavala
Which of the following are found in plant cells buh not animal cells?
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Alia Brock
The diagram shows the field lines near the poles, X and Y,

of two magnets

Based on the field lines, what are the poles of the

magnets?

O X: north

Y south

X: south

Y north

X north

Y north

Х

Y

X south

Y south
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