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A 25.0 kg child on a 2.00 m long swing is released from restwhen the ropes of the swing make an angle of 30 degrees with the vertical.
A) Neglecting friction, find the child's speed at the lowest position?
B) If the acutal speed of the child at the lowest position is2.00 m/s, what is the mechanical energy due to friction?
A trap door, of length and width 2.00 m, is held open at an angle of 65.0° with respect to the floor. what is the torque exerted on the trap door by the rope
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 72.0-kg log falls from a height of 27.0 m into a lake. If the log, the lake, and the air are all at 305 K, find the change in entropy of the air during this process
The rms speed of the molecules in 1.1g of hydrogen gas is 1800 m/s. What is the thermal energy of the gas
A uniform disk with a mass of 885 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz when Jill drops a 145-g clod of clay on a point 8.40 cm from the center of the disk, where it sticks. What is the new rota..
A pair of slits, separated by 0.160 mm, is illuminated by light having a wavelength of ? = 566 nm. An interference pattern is observed on a screen 150 cm from the slits. Consider a point on the screen located at y = 1.90 cm from the central maxim..
A railroad car of mass 2.1 104 kg moving at 2.50 m/s collides and couples with two coupled railroad cars, What is the speed of the three coupled cars after the collision
A commonly used method of fastening one part to another part is called "shrink fitting." A steel rod has a diameter of 2.0053 cm, By how many Celsius degrees should the rod be cooled
A uniform electric field of magnitude 405N/C pointing in the positive x-direction acts on anelectron, which is initially at rest. The electron has moved2.90 cm. What is the work done by the field on the electron?
03.3 A boat is heading upstream when a float is dropped overboard and carried downstream. What is the boat's speed in still water?
A small light cylinder and a large heavy cylinder are released at the same time and roll down a ramp without slipping. Which one reaches the bottom first
A tank having a volume of 0.100 m3 contains helium gas at 180 atm. How various balloons can the tank blow up if each filled balloon is a sphere 0.300 m in diameter at an absolute pressure of 1.50 atm.
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