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Q1. A 1500 {rm kg} wrecking ball hangs from a 20 {rm m} long cable. The ball is pulled back until the cable makes the angle of 17.0^circ with vertical.
Q2. A 70kg mountain climber dangling in a crevasse stretches a 50-m-long, 1.0-cm-diameter rope by 8.0 cm. What is the Young's modulus of rope, in units of N/(m^2)?
Q3. If the speed of sound is 340m/s. What are the allowed frequencies and wavelength for standing sound waves in an unstopped (open on both ends) organ pip whose effective length is 1m?
An object with a net charge of 44 µC is placed in a uniform electric ?eld of 554 N/C, directed vertically. The acceleration of gravity is 9.81 m/s^2. What is the mass of this object if it ?oats in this electric ?eld?
A gasoline engine absorbs 2,600 J of heat and performs 1,000 J of mechanical work in each cycle. Find the total of heat expelled in each cycle.
A 65 kg hiker has fallen down a hole. One rescuer attaches a rope to the injured hiker and then a second rescuer pulls the injured hiker straight up out of the hole at a steady rate. How much force would the second rescuer need to exert on the rope t..
What is the Bens kinetic energy
A hockey stick is swung with the average angular acceleration of 1.5 rad/s2. What is the angular velocity of the stick as it strikes the ball at the end of 0.8 second swing.
Some athletes can put out as much as 800 watts in short bursts. If you could sustain such energy output long enough to reach the top of a mountain, how much time would it take you to get there from the valley, 3000 meters below the peak? So how does ..
A 1.8 kg ball of putty moving to the right has a head-on inelastic collision with the .50 kg putty ball moving to the left. If the combined blob doesn't move just after the collision, what can you end about the relative speeds of the balls before the..
What is average kinetic energy of each helium atom
What was the speed of the car before impact
A speedboat starts from rest and accelerates at +2.01 m/s2 for 6.95 s. At the end of this time, the boat continues for the additional 5.70 s with an acceleration of +0.518 m/s2. Following this, the boat accelerates at -1.49 m/s2 for 8.20 s.
Determine the position of the GPS satellite relative to and from the center of the earth and ratio of clock rates on a GPS clock in orbit and one on the surface of the earth.
Galaxies form by gravitational collapse of regions that are denser than average. Noting that the present day average mass density of the universe is ρ = 3 × 10-30 g/cm-3, estimate how long it takes for a galaxy to collapse.
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