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Sometimes mirages are formed when light reflects from of a warm layer of air near a hot surface (like a road). If it is observed that the light reflects from angles of incidence greater than 89.2 degrees, and if the index of refraction of cool air is 1.003, what is the index of refraction of the hot air (you will need 4 or more decimal places for your answer).
a uniform 12.0kg ladder is 4.0m long and is placed against a frictionless wall at 30 degress. find the frictionless force at the floor necessary to maintaain equilibrium
at point A, 3.00 m from a small source of sond that is emitting uniformly in all directions, the sound level is 53.0 dB. what is the intensity of the sound at point A
A 500 turn solenoid with a length of 20 cm and a radius of 3.0 cm carries a current of 3.0 A. A second coil of four turns is wrapped tightly about this solenoid so that it can be considered to have the same radius as the solenoid. Find when the curre..
What is the net entropy change
A long distance runner starts at given place and runs around a circular track of 63m radius at a speed of 6.0m/s in the clockwise direction for 60 seconds, how far around the track is the runner from the starting point
A force, F(vector) =(2xˆ+3yˆ) N, is applied to an object at a point whose position vector with respect to the pivot point is r(vector) =(4xˆ+4yˆ+4zˆ) m
A flywheel rotates at 50 rad/s. It is brought to rest by a constant frictional torque after making 10 complete revolutions. How long did it take to stop the flywheel
Given two vectors A? = 4.00 i^+ 7.80 j^ and B? = 5.60 i^? 2.00 j^ , find the scalar product of the two vectors A? and B?. Find the angle between these two vectors
A man ties one end of a strong rope 7.64 m long to the bumper of his truck, 0.505 m from the ground, and the other end to a vertical tree trunk at a height of 3.90 m. Compute the magnitude of the torque on the tree
The generator at a power plant produces AC at 24000 V. A transformer steps this up to 345,000 V for transmission over power lines. how many turns must there be in the output coil
if you had a small diameter spring and made pulses, then got a different diameter spring, with the same tension and same length of the spring, What are two ways to affect the speed of a wave
An interstate highway has been built through a neighborhood in a city. In the afternoon, the sound level in an apartment in the neighborhood is 95.0 dB as 105 cars pass outside the window every minute. Late at night, the traffic flow is only six c..
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