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A string is wrapped many times around a pulley and is connected to a block with mb = 5.711 kg that is hanging vertically. The pulley consists of a wheel of radius 45.15 cm and mass mp = 5.453 kg constructed with spokes that have negligible mass. What is the magnitude of the acceleration of the block?
Your clock radio awakens you with a steady and irritating sound of frequency 600 Hz. One morning, it malfunctions and cannot be turned off. What is the frequency of this reflected sound
Consider a spring handing vertically from a ceiling, attached to a mass m of 2 kg. The spring constant, k, is 30 N/m. How far does the spring travel downwards before it reverses direction
Block 1, of mass = 0.500 , is connected over an ideal (massless and frictionless) pulley to block 2, of mass , as shown. Assume that the blocks accelerate as shown with an acceleration of magnitude = 0.300 and that the coefficient of kinetic frict..
A lightbulb has a resistance of 170 ? when operating with a potential difference of 110 V across it. What is the current in the lightbulb
Mattwe pulls his little sister sarah in a sled on an icy surface, with a force of 60 N at an angle of 37 ° upward from the horizontal. If he pulls her a distance of 12m, then determine the work done by matthew?
An electron ( mass = 9.11×10?31 ) leaves one end of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid, which is 1.79 away. It reaches the grid with a speed of 2.96×106 . (You can ignore the gravitati..
1. a a massless rope is stretched horizontally between two supports that are 3.0 m apart. when an object of weight 3200
The tub of a washer goes into its spin cycle, starting from rest and gaining angular speed steadily for 7.00 s, Through how many revolutions does the tub turn while it is in motion
A student drops a lit firecracker off the roof of abuilding with an initial velocity vo=0. She hearsit explode 10s later. The speed of sound is 330. What is its speed when it exploded
An electromagnetic wave has a magnetic field of rms value 3.0 x 10^-6 T. What is the intensity of the wave
A car movig with an initial velocity of 29.6 m/s decrease to a velocity of 17.9 m/s over a time interval of 4.08 seconds. how far did the car travel during this time
An automobile emits 20 lbs of CO2 per gallon of gasoline burned. how many billions of lbs of CO2 are emitted every year
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