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A ball of mass m is moving around in a circle of radius r1 =3ft with speed v1 = 6ft/s on the horizontal table. The cord shown is connected to the ball and runs through the hole in the table at O down to the small handle at B. Someone then starts to pull downward on the cord at B at a constant speed of 2 ft/s. Determine how far the ball is from O when it reaches a speed of 12 ft/s and how long it takes to reach that speed. Neglect friction, the weight of the cord, and the size of the ball.
Assuming that the acceleration is uniform when the racquet is applied over a distance of 0.52 m, illustrate what is the magnitude of the force exerted on the ball by the racquet?
If the column is 2.30m in length before being stressed, what is the decrease in length
A 170 km long high-voltage transmissionline 2.0 cm in diameter carries a steady current of 950 A. If the conductor is copper with a free chargedensity of 8.1*1028electrons per cubic meter, how many years does it take one electronto travel the full ..
During 0.25 s, a wheel rotates during an angle of 3.62 rad as a point on the periphery of the wheel moves with a constant speed of 2.23 m/s. What is the radius of the wheel?
Find the resolving power of a grating needed to separate the sodium-D spectral lines, which are at 588.5 nm and 589.2 nm. How many lines should the grating have to achieve this resolution in first order? (This is a very lower solution in terms of pre..
A train is moving parallel and adjacent to a highway with aconstant speed of 23 m/s. Ini- tially a car is 34 m behind thetrain, traveling in the same direction as the train at 34 m/s, and accelerating at 3 m/s2. What is the speed of the car just a..
a soccer player kicks a rock horizontally off a 41.3 m high cliff into a pool of water. if the player hears the sound
It reflects off of mirror 1, then off of mirror 2. then off of mirror 1 again (as shown). What is the angle theta that the ray reflects off of mirror 1 after striking it the second time? What is the angle?
A 0.075 kg arrow is fired horizontally. The bowstring exerts an average force of 65 N on the arrow over a distance of 0.9 m. With what speed does the arrow leave the bow
A professor's office door is 0.90 wide, 2.00 high, 4.00 thick; has a mass of 30, and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. When the door is open and at rest, the door closer exerts the torqu..
A car moving at 78mi/hr approaches a yield sign 70m ahead. The driver slows the car with a constant acceleration of -4.5m/s2 by hitting the brakes. How long does it take the car to reach the yield sign
Two cars are on the highway and moving at speeds of v1 = 14.5m/s and v2 = 70.2m/s. What is the frequency of the second car's engine
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