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A girl of mass 40 kg jumps with a horizontal velocity of 5 m s-1 onto a stationary cart with frictionless wheels. The mass of the cart is 3 kg. What is her velocity as the cart starts moving? Assume that there is no external unbalanced force working in the horizontal direction?
A square wire carrying a current of 5 A has sides of 10 cm and is placed in the yz plane. The torque on the square is
A proton moves at 4.9x106 m/s in a magnetic field where B = 0.42 T. what force does the proton experience
q1. a student who weighs 510 n is wearing a backpack that weighs 70 n. the student is standing still on a level ground.
An owl is chasing a squirrel and is using echolocation (the reflection of sound) to aid in the hunt. If the squirrel is 40.5 m from the owl, how long does it take sound to travel from the owl to the squirrel and then back to the owl? (Use 343m/s a..
A 3.0 m long rigid beam with a mass of 120 kg is supported at each end. An 85 kg student stands 2.0 m from support 1. Explain by how much upward force does each support exert on the beam?
A photon, a packet of electromagnetic radiation, carries both energy and momentum. Consider a photon with a wavelength of 457 nm in vacuum. What is the momentum of the photon
The blades in a blender rotate at a rate of 6400 rpm. What is the angular acceleration as the blades slow down
Two parallel slits are illuminated by light composed of two wavelengths. One wavelength is ?A = 560nm. The other wavelength is ?B, What is the unknown wavelength
You create a diffrent kind of pendulum by swinging a meter stick (mass m) on its end. It swings with small oscillations. Determine the angular frequency w ( I=1/3 ML ^2)
an explorer is caught in a whiteout in which the snowfall is so thick that the ground cannot be distinguished from the
A flat circular coil with 110 turns, a radius of 4.10 × 10-2 m, and a resistance of 0.500 ? is exposed to an external magnetic field that is directed perpendicular to the plane of the coil, Find the induced current in the coil
This situation is like that of a car on a curve that is banked at an angle of 21.50°. If she tries to make the turn without slowing down, what is the minimum distance from the seawall that she can begin making her turn and still keep away from a c..
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