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A father pulls his identical twins on identical sleds tied one after the other. He exerts a force F that makes an angle of 30degrees with the horizontal and that leads to an acceleration of the two sleds. The mass of each sled with its twin is m. Assume no friction. What is the tension in the rope that he is pulling? What is the the tension in the rope that connects the two sleds?
Electrons are accelerated through a voltage difference of 15.4 kV inside a television's cathode ray tube. What is the de Broglie wavelength of the electrons
A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.75 of her regular weight. Calclate the acceleration of the elevator
you have encouraged your little sister, who has just gotten glasses for her severe near-sightedness, to give you those glasses so you can play with them. If your sister's face is 180. mm-tall, how tall will it appear to be in the image (in mm)
A Ferris wheel with a radius of 14.0 m rotates at a constant rate, completing one revolution in 30.0 s. What is the apparent weight of a 60 passenger when she is at the bottom of the wheel.
A double-slit experiment is set up using a helium- neon laser (lamda=633nm). How thick is the glass
A common flea that has a mass of 0.008 g can jump vertically as high as 19 cm. Estimate the wavelength for the flea immediately after takeoff
A heat engine operating between energy reserviors of 119.94 oC, How much energy must this engine extract from the hot reservior to do 1,583.1J of work
During this process the arrow's deceleration has a magnitude of 1800 m/s2 and the block's acceleration has a magnitude of 450 m/s2
Two soccer players start from rest, 47 m apart. They run directly toward each other, both players accelerating. How much time passes before the players collide
a revolving car wheel has a radius of 15m and a mass of 3 X 10^4 kg. what torque needs to be applied to stop the car wheel in 15 sec
A man is pulling a 40.0 kg crate across a level floor with a horizontal force, and the coefficient of kinetic friction is ?k = 0.59 for the crate and the floor. What is the normal force acting on the box
A flat surface with area 1.6 m2 is in a uniform electric field of 560 N/C. What is an electric flux through the surface when it is oriented as follows.
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