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Q. A uniform plank of length 5.0 m and weight 211 N rests horizontally on two supports, with d = 1.17 m of the plank hanging over the right support. To what distance, x, can a person who weighs 412 N walk on the overhanging part of the plank before it just begins to tip?
Q. After a 0.380 kg rubber ball is dropped from a height of 1.95 m, it bounces off a concrete floor and rebounds to a height of 1.45 m.
Determine the magnitude and direction of the impulse delivered to the ball by the floor.
A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are 4.00 m to the north, 2.00 m northeast, and 0.90 m at 35.0° west of south. begining at the same initial point, an expert golfer could ma..
If a ball is thrown upwards at 20 ft/sec, the height h after t seconds is given by h = -16t^2 + 20t. How many seconds does it take for the ball to reach its greatest height, and what is this height.
A basketball player makes a jump shot. The 0.600 kg ball is released at a height of 2.00 m above the floor with a speed of 7.20 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.20 m/s Find the work done on the ball by air ..
Assume the charge on black hole is 5740 C. At what distance from it is the electric potential equal to 1100 V.
Two boxes A and B are connected to each end of a light vertical rope. A constant upward force 80.0 is applied to box. Starting from rest, box descends 10.4 in 3.40. The tension in the rope connecting the two boxes is 37.0
What is average kinetic energy of each helium atom
The cannonball is fired at a speed of 53.0 and an angle of 31 above horizontal. A cannonball that was accidentally dropped hits the moat below in 1.40. How far from the castle wall does the cannonball hit ground.
A 12 kg weather rocket generates a thrust of 250 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 560 N/m, is anchored to the ground. What is the rocket's speed while the s..
What is volume concentration
A person with perfect pitch sits on a bus bench listening to the 445 Hz horn of an approaching car. If the person detects the frequency of 488 Hz, how fast is the car moving.
Consider a standing wave on the string with a frequency equal to the fifth harmonic (fn = nf1 with n = 5). How many nodes and antinodes does this standing wave possess.
A water molecule can vibrate in various ways, but the easiest kind of vibration to excite is the "flexing" mode in which the hydrogen atoms move toward and away from each other by HO bonds do not stretch.
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