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A force of 75N is applied horizontally to a box of mass 10kg, moving with an initial speed of 4m/s on a level surface with coefficient of kinetic friction= 0.3. What is the magnitude of the acceleration of the box?
A simple pendulum consists of a 4kg mass attached to a 3m long rope. At t=0 it is moving to the right at 0.4m/s. What is the angular frequency of the oscillation
You construct two wire-frame cubes, one using (infinitely thin) copper wire, the other using (infinitely thin) aluminium wire. Find the difference in volume between the cubes
given an electrical circuit which consists of resistor and voltage sources, determine the current flows (i1,i2,i3, and i4) use the following values for the voltage and resistor sources: V1=20 volts V2=12 volts V3=40 volts, R1= 18 ohms R2= 10 ohms R3=..
Two parallel straight wires are 10 cm apart carry currents in opposite directions. Determine the magnitude and direction of the magnetic field halfway between the wires
Water at 20°C exits a circular tap moving straight down with a flow rate of 10.1 cm3/s. If turbulent flows are characterized by Reynolds numbers above 2300 or so, how far does the water have to fall before it becomes turbulent
A 56-kg student runs at 4.2m/s , grabs a hanging 10.0-m-long rope, and swings out over a lake. He releases the rope when his velocity is zero. What is the angle when he releases the rope
A C1=25 uF capacitor is charged to 4.0kV and then removed from the battery and connected to uncharged C2=45uF capacitor. which capacitor stores more energy and why
A 43.0-N child is in a swing that is attached to ropes 1.60 m long. Find the gravitational potential energy associated with the child relative to her lowest position at the following times.
A ball of mass 522 g starts at rest and slides down a frictionless track. It leaves the track horizontally, striking the ground a distance of 1 m from the end of the track after falling the vertical distance 1.25 m from the end of the track.
A 68-kg person on skis is going down a hill sloped at 30° from the horizontal. The coefficient of friction between the skis and the snow is 0.11. What would be the magnitude of acceleration.
A rescue plane flies horizontally at a constant speed searching for a disabled boat, If it takes the sound 2.10 s to reach the plane, determine the speed of the plane and What is its altitude
A simple harmonic oscillator has an amplitude of 5cm, a spring constant of 5.0N/m, and a maximum speed of 10 m/s. What is the speed when it reaches half of the amplitude
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