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Q. A recording engineer works in a soundproofed room that is 45.0 dB quieter than the outside. If the sound intensity in the room is 1.30 10-10 W/m2, what is the intensity outside?
Q. A certain star is 79.9 light years away. How long would it take a spacecraft traveling 0.960c to reach that star from earth, as measured by observers:
(a) on Earth(b) on the spacecraft(c) What is the distance traveled according to observers on the spacecraft(d) What will the spacecraft occupants compute their speed to be from the results of (b) and (c)?
A crate of mass 150.0 kg lies at rest on a horizontal storage room floor. The coefficient of static friction between crate and floor is 0.72, and the coefficient of kinetic friction is 0.85. (You may suppose g = 10.0m/s2).
A father (m = 65 kg) and son (m = 38 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3.0 m/s after they have separated. How fast would the father be moving.
Determine an average acceleration in coordinates with x-axis
F ind the speed of the golf ball just after impact
At an outdoor market, a bunch of bananas attached to the bottom of a vertical spring of force constant 16.0 N/m is set into oscillatory motion with amplitude of 20.0 cm.
What is the frequency of light that has the wavelength in water of 788 nm if the refractive index for this light is 1.33.
How much energy was released in an explosion
A loudspeaker on a tall pole broadcasts sound waves equally in all directions. If the sound output is 7.0 W, at what distance from loudspeaker is the sound intensity level 85.7 dB.
What is the horizontal component of velocity
A helium-neon laser intended for instructional use operates 7.5 mW. Find out the maximum value of the electric field at a point where the cross sectional area of beam is 10 mm.
What are the first, second, and third frequencies audible from a 20cm long organ pipe when (1) only one end is open and when (2) both ends are open. The speed of sound through the air inside the organ pipe is 343 m/s. (Hint: if a harmonic does not..
With two fingers, you hold an ice cream cone motionless upside down the mass of the cone is m, and the coefficient of static friction between your fingers and the cone is? When viewed from the side, the angle of the tip is 2?
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