Physics Force & Laws Of Motion Level: Misc Level
A wire is stretched between 2 poles 10 meters apart. A sign is attached to the midpoint of the line causing causing it to sag vertically a distance of 50 cm. If the tension in each line segment is 2000 N, what is the weight of the sign?
Physics Properties Of Matter Level: Misc Level
A cable stretches by an amount d when it supports a create of mass M. The cable is replaced by another cable of the same material having the same length but twice the diameter. What is the mass of the load that can be supported by the thicker cable if it stretches by an amount d?
Physics Waves And Oscillations Level: Misc Level
A simple harmonic oscillator with a period of 2.0 s is subject to damping so that it loses one percent of its amplitude per cycle. About how much energy does this oscillator lose per cycle?
Physics Work,Power & Energy Level: Misc Level
A ping pong ball weighs 2.5 x10 -2 N. The ball is placed inside a cup that sits on top of a vertical spring. If the spring is compressed 0.055 m and released, the maximum height above the compressed position that the ball reaches is 2.84 m.Neglect air restance and determine the spring constant.
Physics Waves And Oscillations Level: Misc Level
A ball hung from a vertical spring oscillates in simple harmonic motion with an angular frequency of 2.6 rad /s and an amplitude of 0.07 m. What is the maximum acceleration of the ball?
Physics Circular Motion Level: Misc Level
A solid sphere of radius R rotates about a diameter with an angular speed w. The sphere then collapses under the action of internal forces to a final radius R/2. What is the final angular speed of the sphere?
Physics Rotational Mechanics Level: Misc Level
A 50 kg rider on a moped of mass 75 kg is traveling with a speed of 20 m /s. Each of the two wheels of the moped has a radius of 0.2 m and a moment of inertia of 0.2 kg * m2. What is the total rotational kinetic energy of the wheels?
Physics Force & Laws Of Motion Level: Misc Level
An 80 - kg man balances the boy on a teeter -totter. Fulcrum is located 4 m from the boy and 1 m from the man. What approximately, is the magnitude of the downward force exerted on the fulcrum?
Physics Circular Motion Level: Misc Level
A roulette wheel with a 1.0- m radius reaches a maximum angular speed of 18 rad /s before it stops 35 revolutions (220) rad) after attaining the maximum speed. How long did it take the wheel to stop?
Physics Circular Motion Level: Misc Level
A grindstone of radius 4.0 m is initially spinning with an angular speed of 9.0 rad /s. The angular speed is then increaded to 10 rad /s over the next 4.0 seconds. Assuming that the angular acceleration is constant.What is the average angular speed of the grindstone?
Physics Circular Motion Level: Misc Level
During the time a compact disc ( C D) accelerates from resst to a constant rotational speed of 477 rev /min, it rotates through an angular displacement of 0.250 rev. What is the angular acceleration of the CD?
Physics Kinematics Level: Misc Level
Calculate the height of a cliff if it takes 2.35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.00 m/s. How long would it take to reach the ground if it is thrown straight down with the same speed.
Physics Kinematics Level: Misc Level
A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.0 m /s and her takeoff point is 1.80 m above the pool /
a) What is her velocity when her feet hit the water?
Physics Kinematics Level: Misc Level
A basketball referee tosses the ball straight up for the starting tipoff. At what velocity must a basketball player leave the ground to rise 1.25 m above the floor in an attempt to get the ball?
Physics Kinematics Level: Misc Level
An express subway train passes through an underground station. If enters with an initial velocity of 22.0 m/s and decelerates at a rate of 0.150 m/s 2 as it goes through. The station is 210 m long.
a) if the train is 130 m long, when does the end of the train leave the station?
b) What is the velocity of the end of the train as it leaves the station?
