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A double-concave lens has equal radii of curvature of 15.1 cm. An object placed 14.2 cm from the lens forms a virtual image 4.94 cm from the lens. What is the index of refraction of the lens material?
A fisherman in a stream 57 cm deep looks downward into the water and sees a rock on the stream bed. How deep does the stream appear to the fisherman? Assume that the index of refraction of the water is 1.33.
The resistance of a very fine aluminum wire with a 17?m x 17?m square cross section is 1200 ? . A 1200 ? resistor is made by wrapping this wire in a spiral around a 3.9-mm-diameter glass core
What is the pressure change in water going from a 3.2- cm-diameter pipe to a 1.9- cm-diameter pipe if the velocity in the smaller pipe is 6.5 m/s
The vertical displacement of particles in a string, where everything is measured in standard units, meters and seconds, What is the amplitude of the wave
Assume you are 65.00 cm from a plane mirror. What area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 5.0 mm.
Two loudspeakers are vibrating in phase. They are set up as point C is located. Assume the speed of sound is 342 m/s. The speakers play the same tone. What is the smallest frequency that would produce destructive interference at point C.
An electric car is being designed to have an average power output of 4,900 W for 2 h before needing to be recharged, How much energy would be stored in the charged batteries
An airplane is flying with a velocity of 95 at an angle of 19 above the horizontal. When the plane is a distance 111 m directly above a dog that is standing on level ground, suitcase drops out of luggage compartment.
A 45-kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 25 degrees , At what angle does the crate begin to slide
Nobel laureate Richard Feynman (1918-1988) once said that if two persons stood at arm's length from each other and each person had 1% more electrons than protons, the force of repulsion between them would be enough to lift a "weight" equal to that..
By using integral calculus, find the area of the region bounded by the graphs of y = x^2 and y = 4. (x and y are in meters.) Calculate the rotational inertia of this object when it is spinning around y-axis.
The other end is attaced to a 3 kg disk moving in uniform circular motion on the table, which stretches the spring by 1 cm. Note: Friction is negligibe. Illustrate what is the work done on the disk by the spring during one full circle?
illuminate the object with the flashlight. One way to produce artificial gravity in a space station is to spin it.
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