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A 2.1 kg block of wood rests on a long tabletop. A 22.7 g bullet moving horizontally with a speed of 168 m/s is shot into the block and sticks in it. The block then slides 34.1 cm along the table and stops. Find the magnitude of the frictional force between the block and the table.
question1you encounters a moving walkway that is 91 long and has the speed of 2.1 relative to the ground. how long
Determine an angle (in radians) through which the drill rotates during this period.
A 48.5 kg circus acrobat drops from a height of 1.62 meters straight down onto a springboard with a force constant of 7.95 103 N/m, By what maximum distance does she compress the spring
Speakers A and B are vibrating in phase. They are directly facing each other, are 8.0 m apart, and are each playing a 76.0-Hz tone. The speed of sound is 343 m/s. On the line between the speakers there are three points where constructive interfere..
In an ultra-low-temperature experiment, a collection of sodium atoms enter a special state called a Bose-Einstein condensate in which the index of refraction is 1.57 107
A battery has an emf and an internal resistance . When the battery is connected to a 25 resistor, the current through the battery is 0.65 . When the battery is connected to 60 resistor, the current is 0.45 .
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 wooden box weighing 245 n is pushed across the floor by a workman who exerts a horizontal force of 172 n. if the
A proton and an alpha particle (q = +2e, m = 4 u) are fired directly toward each other from far away, each with an initial speed of 0.012c. What is their distance of closest approach
The angle of incidence of a light beam onto a reflecting surface is continuously variable. The reflected ray in air is completely polarized when the angle of incidence is 49.2°. What is the index of refraction of the reflecting material?
A 100N box initially at rest is pulled by a horizontal rope on a horizontal table the coefficients of kinetic, What is the friction force on the box if the pull is 35N and 75N
Find the period of a child's leg as it swings about the hip joint. Assume the leg is 0.39 m long and can be treated as a uniform rod, Estimate the child's walking speed
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