Physics Waves And Oscillations Level: Misc Level
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Mass -spring system is set up on the top of a building. It is designed to oscillate at the same frequency as the building itself, helping to reduce the overall oscillation amplitude of the building.The 3.73 x105 kg mass completes one oscillation in 6.80 s, and the oscillation amplitude in a high wind is I 10 cm. Determine the spring constant and the maximum speed experienced by the mass.
Physics Ray Optics Level: Misc Level
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Through what range of incident angles can light escape from the water in the tank.
The diagram shows: An x and y axis, the y axis is straight up (I) from the top of the y axis there is an angle comming down from it (it looks like a 45 degree angle). sitting on top of the x axis n =1.33 WATER---(H2o --------I ). ( I =y axis)
The next shaded area under that n =1.60 glass
Under that .........................n =1.0 Air.
Physics Ray Optics Level: Misc Level
A beam of light enters water from the air. a) If its angle of incidence is 70 degrees, What is the angle of refraction? b) At what angle must it enter the water if its angle of refraction is to be 20 degrees?
Physics Ray Optics Level: Misc Level
The red light from a helium -neon laser has a wavelength =633 n m in a vacuum. lts speed is 1.92 X108 m /s.Find : a) the index of refraction of the oil, b) the wavelength in oil c) the frequency in the oil, d) the frequency in the vacuum.
Physics Ray Optics Level: Misc Level
Using a convex mirror (60 cm radius of curvature),it is desired to obtain an image half as far behind the mirror as the object is in front of it. a) Where should the object be placed? b) What will be the mirror s magnification in this case?
Physics Rotational Mechanics Level: Misc Level
If only an external force can change the momentum of the center of mass of an object, how can the internal force of the engine accelerate a car?
Physics Rotational Mechanics Level: Misc Level
Describe an analytic way of determining the CM of any triangular-shaped, thin uniform plate.
Physics Force & Laws Of Motion Level: Misc Level
A superball is dropped from a height h onto a hand steel place (fixed to the earth), from which it rebounds at very nearly its original speed.
a) Is the momentum of the ball conserved during any part of this process?
b)If we consider the ball and Earth as our system, during what parts of the process is momentum conserved?
c) Answer part (b) for a piece of putty that falls and sticks to the steel place.
Physics Rotational Mechanics Level: Misc Level
A 3 - pound weigh hangs from a rope at the end of a 5- foot rod held at a 45 degree angle above the horizontal. Find the torque on the end of the rod oppostie the hanging weight.
Physics Work,Power & Energy Level: Misc Level
Find the work done by the force F=5i +5j +k over the distance from (0,0,0 ) to (10,25,30)
Mathematics Coordinate Geometry Level: Misc Level
What is the angle between the line L: x =1 +2t, y=2-t, z=-2t and the plane whose equation is 3x +2y+z =5
Mathematics Algebra Level: Misc Level
If r ={ 2z, 4 x, 6y } and s ={ x- z,2 x y,y +2 z } find r.s (r dot s) and rXs (r cross x)
Physics Work,Power & Energy Level: Misc Level
On a rollar coaster ride the total mass of the cart -with passengers included -is 300 Kg. the first peak is 42 m above the ground, and the second peak is at 25.5 m . the second peak is 12.9 m /s. ( the wheel mechanism keeps the cart safely on the rails) how much energy is lost due to frictio between the two peaks? (in J )
Physics Waves And Oscillations Level: Misc Level
The speed of sound in air is 336 m /s. If an audible sound has a frequency of 3000 Hz, what is its wavelength in meters?
Physics Waves And Oscillations Level: Misc Level
A pendulum having a length of 2.7 m and is on the surface of Planet X. Planet X has a radius of 1.22 re and a mass of 0.6 me ( re and me are the radius and mass of the earth, respectively). What is the period, in seconds of the pendulum?
