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The force constant of a spring is 600 N/m and the unscratched length is 0.72 m. A 3.2-kg block is suspended from the spring. An external force slowly pulls the block down, until the spring has been stretched to a length of 0.86 m. The external force is then removed, and the block rises. In this situation, when the spring has contracted to a length of 0.72 m, what is the upward velocity of the block?
Suppose that 1.05 108 J of this energy flows directly into the surroundings (engine block and exhaust system) in the form of heat. If 6.0 105 J of work is required to make the car go one mile, expalin how many miles can the car travel on one ga..
Fred (mass 63kg ) is running with the football at a speed of 5.8m/s when he is met head-on by Brutus (mass 130kg ), who is moving at 4.1m/s. How far do they slide
FA 2.0%u03BCC charge and a 2.9%u03BCC charge are 11.0cm apart. Find a point where the electric field is zero
q. a 12.0 kg bucket of water of is suspended by a rope wrapped around a windlass which is the solid cylinder 0.500 m in
A uniform-density 8 kg disk of radius 0.27 m is mounted on a nearly frictionless axle. Initially it is not spinning. A string is wrapped tightly around the disk, and you pull on the string with a constant force of 39 N by a distance of 0.7 m. Now ..
A 9.7 Ω resistor,a 10.8 µF capacitor, and a 27.9 mH inductor are connectedin series with a 120 V (rms) source with variable frequency. At what frequency will the current be maximum? Find the maximum rms current.
The mass of the sled and its two riders in Figure 5.5 is 214 kg. Find the magnitude of the centripetal force that acts on the sled and its two riders during the turn with a radius of 30.0 m, if the speed is equal 34.0 m/s.
An automobile starter motor has an equivalent resistance of 0.0470 and is supplied by a 12.0 V battery with a 0.0120 internal resistance. What is the current to the motor
a 3.8 kg fish swimming 1.3 ms swallows an absent minded 1.4 kg fish swimming toward it at a velocity that brings both
Assume that, as lying on a beach near the equator of a far-off planet watching the sun set over a calm ocean, you start a stopwatch just as the top of the sun disappears.
A vinyl record plays at 45.0 rpm. Assume it takes 10 s for it to reach this full speed, starting from rest. How many revolutions does the record make before reaching its final angular speed
A concave mirror has a focal length of 20 cm. What is the position (in cm) of the resulting image
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