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A box with a weight of 50 N rests on a horizontal surface. A person pulls horizontally on it with a force of 10 N and it does not move. To start it moving, a second person pulls vertically upward on the box. If the coefficient of static friction is 0.4, what is the smallest vertical force for which the box moves?
Helium gas is confined in a volume of 3 m3 and is at pressure of 2.1 atmospheres. What is the thermal energy of this gas
A monoenergetic beam of electrons in incident on a single slit of width 1.05 nm. A diffraction pattern is formed on a screen 20 cm from the slit. what is the energy of the incident electrons
The specific heat of water is 4186 J/kg•K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm3.
Two blocks, masses m1 and m2 are connected by an ideal string passing over an ideal pulley. Find the acceleration of each block
A car is traveling along a straight road at a velocity of +39.0 m/s when its engine cuts out. For the next ten seconds the car slows down, Find the velocity of the car at the end of the initial ten-second interval
Consider again the long wire near a small wire rectangle. The long wire is part of a circuit. The circuit is small enough that all the approximations we've used in class are good, but the wire near the rectangle is much longer than the rectangle. ..
An object of mass 5kg has an initial velocity of 10m/s, if this object has moved a distance of 40m and maintains a final velocity of 20m/s. What is the external force encountered by this object
A car backs out of a driveway in front of a fire truck. The driver of the fire truck takes 0.18s to hit the brakes. How far away from the car was the fire truck when the driver first saw the car
A 10.00 kg grocery is pushed 12.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. a.) What work is done on the cart? b.)If all frictional forces are neglected, and the cart starts form rest, what is the grocery cart..
a spring has a constant k=8.75 N/m. if the spring is displaced 8.150 m from its equilibrium position, what is the force that the spring exerts
Two conductors insulated from each other are charged by transferring electrons from one conductor to the other. After 9.057 × 1013 have been transferred, the potential difference between the conductors is 16.8 V. The charge on an electron is −1.60218..
A candle is placed 16.0 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, the image moves 6.5cm farther away from the mirror. Find the focal length of the convex mirror.
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