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A flat piece of glass is supported horizontally above the flat end of a 12.0 cm long metal rod that has its lower end rigidly fixed. The thin film of air among the rod and the glass is observed to be bright when illuminated with light of wavelength 515 nm. As the temperature is slowly increased with 24.0°C, the film changes from bright to dark and back to bright 150 times. What is the coefficient of linear expansion of the metal?
Sarah's twist angular momentum increases from 0 to 50 kg*m^2/s in 0.25 s as she initiates a twisting jump on the ice. How fast is Sarah's twist angular velocity at the end of the 0.25 s
A 300 kg piano slides 4.50 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.
An overhead projector has a convergent lens of focal length 35.0 cm. It projects the image of transparency on a wall 4.00 meters from the lens. how wide is the image on the screen
A proton moves through a magnetic field at 31.5% of the speed of light. what is the magnitude of the magnetic force acting on the proton
A uniform ladder 15 ft long is leaning against a frictionless wall at an angle of 56° above the horizontal. The weight of the ladder is 35 pounds. A 77 lb boy climbs 6.0 ft up the ladder. What is the magnitude of the friction force exerted on the lad..
Starting from rest at t = 0, a wheel undergoes a constant angular acceleration. When t = 1.8 second, the angular velocity of the wheel is 6.7 rad/s, Compute through what angle does the wheel rotate in the interval t = 0 to t = 37 second
A square with sides of length 2m is perpendicular to a magnetic field of strength 10 T. If the square is rotated by 60 degrees, what is the change in magnetic flux through the square
An object is placed 57 cm from a concave mirror of radius 15 cm. Discover the location of the image. What is the magnification of the mirror?
A vertical solid steel post 25 cm in diameter and 3.50 m long is required to support a load of 7100 kg. You can ignore the weight of the post. What is the strain in the post
A laser that produces a spot of light that is 1.25 mm in diameter is shone perpendicularly on the center of a thin, what is the power of the laser
The speed of an alpha particle is determined to be 8.75×106 m/s. If all of its kinetic energy is acquired by passing through an electric potential, what is the magnitude of that potential
A 3.1 kg dog stands on a 15.00 kg flatboat at distance D = 6.1 m from the shore. It walks 2.00 m along the boat toward shore and then stops. Assume no friction between the boat and the water, find how far the dog is then from the shore.
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