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A person pushing horizontally a uniformly-loaded 25.20 kg wheelbarrow is attempting to get it over a horizontal step whose height is 39.0% of the wheel\'s radius. What is the minimum force necessary to push the wheelbarrow over that step?
you are hanging over the edge of a cliff. your two friends throw down a rope and you hold on to the middle. in terms
an experiment is set up in which a red laser with a wavelength of 656.2m is directed through a large, irregularly shaped piece of synthetic material. What is the index of refraction of the synthetic material
A particle of charge +2.56 x 10-6 C is 12.4 cm distant from a second particle of charge -1.55 x 10-6 C. Calculate the magnitude of the electrostatic force between the particles
Different process for descending versus climbing stairs.
Certain neutron stars (extremely dense stars) are believed to be rotating at about 1000 rev/s. If such a star has a radius of 11 km, what must be its minimum mass so that material on its surface remains in place during the rapid rotation?
A 300g ball on a 70cm -long string is swung in a vertical circle about a point 200 cm above the floor, What was the tension in the string an instant before it broke
A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 56.11 diopters, and the lens-to-retina distance is 1.791 cm. (a) How far is the blackboard from her eyes? (b) If the writing on the blackboard i..
a 6.00 kg bowling ball is rolling at 9.00 m/s. It collides with a 1.50 kg bowling pin at rest. What is the velocity of the ball after the collision
When a gas is quickly compressed (say by pushing down a piston), its temperature increases. When a gas expands against a piston, it cools. Describe these changes in temperature using the kinetic theory, in particular nothing what happens to the momen..
A circular loop (radius= 17 cm) of wireis placed in a magnetic field that makes an angle of 30° withthe normal to the plane of the loop. The magnitude of this field increases at a constant rate from 30 mTto 36 mT in 15 ms.If the loop has a resista..
Two very long wires carrying a current I of 3.0 A out of the pageare at two of the corners of an equilateral triangle. The sides ofthe triangle are 1.0 m long. Find the direction and magnitude of the magnetic field at P, the third corner of the trian..
A grinding wheel is in the form of a uniform solid disk of radius 6.90 cm and mass 1.90 kg, how many revolutions does it turn while accelerating
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