Physics Force & Laws Of Motion Level: Misc Level
To push a piece of heavy furniture across the carpet usually takes more force to get it moving than it takes to keep it moving. This is because:Of Newton,s 3rd law, the static coefficent of friction is larger than the kinetic coefficient,it does not take more force, or the kinetic coefficient of friction is larger than the static coefficient.
Physics Force & Laws Of Motion Level: Misc Level
A wooden block slides directly down and inclined plane, at a constant velocity of 6 m/s. How large is the coefficient of kinetic friction, if the plane makes an angle of 25 degrees with the horizontal?
Physics Force & Laws Of Motion Level: Misc Level
Consider a plot of the displacement on the y axis vs. applied force on the x axis for an ideal elastic spring. The slope of the curve would be:The reciprocal of the spring constant, the spring constant, the acceleration of gravity, the reciprocal of the acceleration of gravity.
Physics Work,Power & Energy Level: Misc Level
Two men, Joel and Jerry, push against an immovable wall. Jerry stops after 10 min, while Joel is able to push for 5 min longer. Compare the work they do. Who does the most work or do they work at all.
Physics Force & Laws Of Motion Level: Misc Level
A Packing car slides down an inclined plane at a constant velocity. Thus We Can deduce that:A net downward force is action on it, it is not acted on appreciable gravitational force, it may be accelerating,a frictional force is acting on it.
Physics Units Level: Misc Level
Which of the following in not a unit of work:J,
kg-m/s, kW-h, W-s, N-m
Physics Work,Power & Energy Level: Misc Level
You Lift a 1 Olb physics book up in the air a distance of 1 ft, at constant velocity of .5 ft/s.the work done by gravity is: +5 ft.lb-5 ft.lb zero-10 ft.lb+10 ft.lb
Physics Work,Power & Energy Level: Misc Level
A marathon runner has an average metabolism rate of about 9.5 E2 kcal/h during a race. If the runner has a mass of 55 kg, estimate how much water she would lose to evaporation from the skin for a race that lasts 3.4 h.
Physics Properties Of Matter Level: Misc Level
What mass of steam at a temperature of 100.% C, must be added to 2.9 kg of ice at a temperature of 0.0%C to yield liquid water having a temperature of 25.0%C?
Physics Heat & Thermodynamics Level: Misc Level
A small immersion heater is rated at 3.0 E2 w. Estimate how long it will take to heat a cup of soup (assume this is 2.5 E 2 mL of water) from 22% C to 57% C.
Physics Wave Optics Level: Misc Level
Assuming that h is the wavelength of light in oil, for an oil film on water, constructive interference occurs with the minimum film thickness of:
a.h
b.2 h
c.h/4
d.h/2
Physics Ray Optics Level: Misc Level
A light beam composed of red and blue light is incident upon a rectangular glass plate, as shown. The light emerges into the air from point P as two separate beams
a. that are parallel, with the blue beam displaced below the red beam.
b.that are parallel, with the red beam displaced below the blue beam.
c. that are not parallel, with the red beam displaced below the blue beam.
d. that are parallel, with the blue beam displaced below the red beam.
e. None of the listed is correct.
Physics Ray Optics Level: Misc Level
We have seen that two monochromatic light waves can interfere constructively or destructively, depending on their phase difference. One consequence of this phenomena is
a. the colors you see when white light is reflected from a soap bubble.
b. the way in which polaroid sunglasses work.
c. the formation of an image by a converging lens, such as the lens in your eye.
d. a rainbow.
e. the appearance of a mirage in the desert.
Physics Wave Optics Level: Misc Level
If two light waves are coherent, which of the following is NOT necessary?
a.They must have the same frequency.
b.They must have the same velocity.
c. They must have the same amplitude.
d.They must have the same wavelength.
e.They must have a constant phase difference at every point in spsce.
Physics Wave Optics Level: Misc Level
The index of refraction of diamond is 2.42.This means that a given wavelength of light travels
a.2.42 times faster in diamond than it does in vacuum.
b. 2.42 times faster in air than it does in diamond.
c.2.42 times faster in diamond than it does in air.
d.2.42 times faster in vacuum than it does in diamond.
