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A power supply maintains a potential difference of 81.5 V across a 1.01-k? resistor. What is the current in the resistor in milliamperes?
A proton ,a neutron and an alfa particle ,accelerated through the same potential difference ,enter a region of uniform magnetic field moving at right angles to B.(a) compare their kinetic energies .(b) if the radius of the proton’s circular path is 1..
A 69-kg construction worker stands at the far end of the beam. What is the magnitude of the torque about the point where the beam is bolted in place.
To determine the location of her center of mass, a physics student lies on a lightweight plank supported by two scales 2.50m apart, find the distance from the student's head to her center of mass
A small circular hole 7.00 in diameter is cut in the side of a large water tank, 25.0 below the water level in the tank. The top of the tank is open to the air.
Two persons on ice skates stand face to face and then push each other away. Their masses are 60kg and90kg. find the ratio of their speeds immediately afterwards. which person has the higher speed?
The aorta in humans has a diameter of about 1.9 cm and at certain times the blood speed through it is about 60 cm/s. find the Reynolds number for blood flow through the aorta
A permanent magnet is hung from a string ( balanced ) and pointed in an East - West orientation and released. Describe its motion
Jack and Jill are standing on a crate at rest on the frictionless, horizontal surface of a frozen pond. Jack has a mass of 74.6kg , Jill has a mass of 44.0kg, What is the final speed of the crate if Jill jumps first and then Jack, again in the same..
A 50kg diver in a full layout position, with a total body radius of gyration with respect the her transverse principal axis equal to 0.45m, What is the diver's angular velocity
At the bottom of the slope, the path levels out and become horizontal, the snow becomes less icy, and the skier begins to slow down, coming to rest in a distance of 160.00 m along the horizontal path.
a deuterium nucleus (mass 2.00) moving at 650 m/s collides with a helium nucleus (mass 4.00) moving at 480 m/s in the opposite direction, what percentage of the initial total energy is lost in the collision
A 30,000-kg freight car is coasting at 0.850 m/s with negligible friction under a hopper that dumps 110,000 kg of scrap metal into it. What is the final velocity of the loaded freight car
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