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You are called as an expert witness in the trial of a traffic violation. The facts are these: A driver slammed on his brakes and came to a stop with constant acceleration. Measurements of his tires and the skid marks on the pavement indicate that he locked his car's wheels, the car traveled 192 ftbefore stopping, and the coefficient of kinetic friction between the road and his tires was 0.750. The charge is that he was speeding in a 45 mi/hzone. He pleads innocent.
A. What is your conclusion, guilty or innocent?
B. How fast was he going when he hit his brakes?
A 790-N cliff diver in Alcapulco drops from a cliff 20.60 m above the water's surface. If friction is disregarded, what is the cliff diver's speed just before striking the water.
A car of mass 1110 kg travels at a speed of 20 ms-1 along a straight road. The driver sees a red traffic light ahead, and applies brakes. The coefficient of friction between the car tyres and the road is 0.83. Take the acceleration due to gravity to ..
What is the terminal speed at which the bar falls? Imagine the bar remains horizontal and in contact with the rods at all times.
An uncharged capacitor is connected to a 55 V battery until it is fully charged, after which it is disconnected from the battery. A slab of paraffin is then inserted between the plates.
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it, What is the power of one laser pulse
If an object of 50 grams of unknown material at 100 degrees C is mixed with 100 grams of water at 0 degrees C, the final temperature is 40 degrees C
Rare 1918 "Jenny" stamp, depicting a misprinted, upside-down Curtiss JN-4 "Jenny" airplane, was sold at auction for $525,000. A collector uses a simple magnifiying glass to examine the "Jenny," obtaining a linear magnification of 2.4 when the stam..
There is a long smooth slope and we release balls from the top of it every 1.5 s. Suppose the acceleration of the ball is 4.8 m/s2 and every ball is numbered in the releasing order.
A plane is headed east with an air speed of 205.0 m/s. The wind blows southeast at 32.0 m/s. Determine the velocity of the plane relative to the earth.
You are on a bridge which is a height 30m above the water. You first drop a ball and then 1.5 seconds later throw a second ball down so that both balls hit the water at the same time.
A 1.80 MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as the heart beats.
Cube of ice is taken from the freezer at -8.5°C and placed in a 75-gram aluminum calorimeter filled with 300.0 grams of water at room temperature of 20.0°C. The final situation is observed to be all water at 17°C. What was the mass of the ice cub..
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