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1. Two cars, each with a mass of 6000 kg, hit head on each traveling at 80 km=h. Estimate the increase in internal energy absorbed by the materials in each car. 2. A 6500-kg car is traveling at 90 km=h and suddenly brakes to a stop. If the four brake disks absorb all the energy, estimate the maximum increase in temperature of those disks, assuming the disks absorb the energy equally. The 0.7-cm-thick, 30-cm-diameter disks are made of steel. Use rsteel ¼ 7850 kg=m3 and ðcpÞsteel ¼ 0:5 kJ=kg·-C.
An inclined plane of angle ? has a spring of force constant k fastened securely at the bottom so that the spring is parallel to the surface. A block of mass m is placed on the plane at a distance d from the spring.
An electron with kinestic energy 1.8 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 27.0 cm, Find the period of the motion
A light string can support a stationary hanging load of 27.0 kg before breaking. What range of speeds can the object have before the string breaks
A box of sand, initially at rest, is to be pulled across a floor by means of a cable in which the tension cannot be allowed to exceed 1100N. What is the weight of the sand and box in that situation
In a series L-R-C circuit, the components have the following values: = 21.5 , = 165 , and = 400 . The generator has an rms voltage of 120 and a frequency of 1.25 .Determine the average power supplied by the generator. Determine the average power diss..
A recent tomb has been unearthed in Egypt that shows the set of wall paintings and hieroglyphics of stars falling to and rising above the horizon over the course of the year (these stars served as sentinels for the pharaoh's passage through the un..
A dog is sitting in front of a plane mirror. At a command it jumps at the mirror with a speed of 0.50 m/s. How fast does the dog approach its image
A man opens a door by applying a 14 Newton force perpendicular to it at a distance 0.90 meter from the hinges. Calculate what was the average power delivered
A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. The coefficient of static friction between the ground and the lower end of the board is 0.666. Find the smallest value for the angle ?, s..
The pulmonary artery, which connects the heart to the lungs, has an inner radius of 2.9 mm and is 8.6 cm long. find the average speed of blood in the pulmonary artery
Two identical small insulating balls are suspended by separate 0.22-m threads that are attached to a common point on the ceiling. Determine the tension in the threads
Find the angular velocity of the earth as it spins on its axis and the tangential velocity of an object at the equator and one at the University of West Florida in Pensacola
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