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Question: One of the inspectors in the quality control department has frequently used the Brinell and Rockwell hardness tests, for which equipment is available in the company. He claims that all hardness tests are based on the same principle as the Brinell test, which is that hardness is al-ways measured as the applied load divided by the area of the impressions made by an indentor. (a) Is he cor-rect? (b) If not, what are some of the other principles involved in hardness testing, and what are the associated tests?
A stone is thrown vertically downward at an initial speed of 14 m/s from a height of 65 m above the ground. (a) How far does the stone travel in 2.0 s? (b) What is the velocity now before it hits the ground?
In 2.0 minutes, a ski lift raises 4 skiers at constant speed to a height of 170 m. The average mass of each skier is 65.00 kg. What is the average power provided by the tension in the cable pulling the lift.
A rock is dropped off the side of a bridge and hits the water below 5.7 s later. What is the height of the bridge above the water
The magnetic field in an electromagnetic wave has a peak value given by B = 2.7mu T. Find the average intensity
an airplane has a mass of 33500 kg and takes off under the influence of a constant net force of 37500 n. what is the
Two acrobats, each of 60.0 kg, launch themselves together from a swing holdings hands. What should be the distance (in m) between the two swings
What is the minimum power that must be supplied in the steady state so that the amount of liquid water in R the container neither increases nor decreases with time? You may neglect other losses of heat, such as conduction and radiation from the co..
Iced tea is made by adding ice to 2.4 kg of hot tea, initially at 70?C. How many kg of ice, initially at 0?C, are required to bring the mixture to 10?C? (Lf = 3.33×105 J/kg, cw = 4,186 J/kg•? C)
Block M=70N and block m=35N are connected by a string as shown. If the pulley is massless and the surface is frictionless, the magnitude of the acceleration of the 35N block is block is:
you are tuning an out of tune organ pipe to a tuned pipe of middle c 261.63 hz. you hear a beat frequency of 2
A shopper in a supermarket pushes a cart with a force of 35.0 N directed at an angle of 25.0° downward from the horizontal. Find the work done by the shopper on the cart as he moves down an aisle 50.0 m long
A spherical mirror forms an image that is virtual, one-quarter of the size of the object, and 3cm from the mirror. Find the focal length of the mirror, and draw the corresponding ray diagram.
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