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A force P pulls on a crate of mass m that is in contact with a horizontal rough surface. Which statement best describes the motion of the crate
The coeficient of friction on a horizontal cicular track, radius 0.25 km, is 0.7. How fast can a car go around skidding out
A sample of an unknown substance appears to weigh 15.1 N in air and 9.18 N when immersed in a solvent with density 0.945 g/mL. Find the density of the sample
A bullet, m kg traveling horizontally at 300 m/s hits a block of wood, mass 10kg. What was the mass of the bullet
Light from a helium-neon laser (? = 633 nm) passes through a circular aperture, What is the diameter (in mm) of the hole
For a demonstration, a professor uses a razor blade to cut a thin slit in a piece of aluminum foil. evaluate the width of the slit
A 2.0 cm tall object is placed in front of a mirror. A 1.0 cm tall upright image is formed behind the mirror, 150 cm from the object. find Is the image erect or inverted
48 g of ice at -10oC is added to 150 g glass filled with 250 g of water at 20oC. At what temperature will the mixture reach equilibrium
Nitrogen in a horizontal piston-cylinder assembly expands from an initial volume of 0.10 m3 to a final volume of 0.5 m3 as the gas is heated for 5 minutes by an electrical resistance heater consumin
A 62-kg skier speeds down a trail. The surface is smooth and inclined at an angle of 22 with the horizontal. Determine the normal force acting on the skier
Radio waves of wavelength 104 m from a galaxy reach a radio telescope by two separate paths, Find the height of the radio telescope dish above the water
A contestant on "Survivor" is challenged to find buried treasure in a featureless desert. For how long should she run in order to retrieve the treasure
As they go around, they experience a centripetal acceleration of 2.20 . What is the diameter of this particular Ferris wheel
A projectile is fired in such a way that its horizontal range is equal to 7 times its maximum height. What is the angle of projection
Tarzan swings on a 35.0-m-long vine initially inclined at an angle of 32.0° with the vertical. What is his speed at the bottom of the swing if he starts from rest
A particle of rest energy mc^2 is moving with speed v in the positive x direction. The particle decays into two particles, each of rest energy 140 MeV. Find the rest energy of the original particle
A 20kg suitcase is being pulled with constant speed by a handle that is at an angle of 22degrees above the horizontal. what is the force F applied to the handle
A cyclotron used to accelerate an alpha particle (m=6.65 x 10-27 kg q= 3.2 X 10-19 C) has a radius of .50 m and a magnetic field of 1.8 T. what is the force that acts on the alpha particle
A 2.40-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 3.20sin(2?t), Find the resonance angular frequency of the system
Two identical point charges are fixed to diagonally opposite corners of a square that is 0.420 m on a side. How much work is done by the electric force
A light bulb has a tungsten filament. When the bulb is just turned on and its temperature is 20? C, the current in the bulb is 0.86 A. What is then the temperature of the filament
A sledge loaded with bricks has a total mass of 17.4 kg and is pulled at constant speed by a rope inclined at 20.4° above the horizontal. How much work is done by the rope on the sledge
a +2.0-uC charge is initially 0.20 m from a fixed -5.0-uC charge and is then moved to a position .50m from a the fixed charge. how much work is required to move the charge
What is the maximum instantaneous power dissipated by a 1.0 hp pump connected to a 240-Vrms ac power source
An extension cord made of two wires of diameter 0.129cm (no. 16 copper wire), How much power is dissipated in the cord