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If the coefficient of friction between tires and roadway is 0.50, what is the smallest radius at which
a car can turn on a horizontal road when its speed is 30 miles/hour?
. A power station conveyor lifts 500 tons of coal per hour to a height of 80 feet. What average
horsepower is required?
A stone is thrown at an initial speed of 125 ft/s directed 60
above the horizontal at the cliff of
height, y. The stone strikes the cliff 5.8 seconds after launching. Find the height of the cliff and
the speed of the stone just before impact at the top of the cliff.
What is the resultant of a displacement 6.0 miles North and one 9.0 miles East?
IV. An iron wire 1.0 m long with a square cross-section 2.0 mm on a side is used
to support a 100 kg load. Find the change in length.
VI. Find the maximum speed of a particle that undergoes SHM with a period of
0.50 s and an amplitude of 20 mm.
Consider radium, which has a half-line of 1620 years. How many atoms of radium will decay in 5 s in 15 g of its sample? Consider the atomic weight of radium to be 226 kg/mol.
IV. An iron wire 1.0 m long with a square cross-section 2.0 mm on a side is used
to support a 100 kg load. Find the change in length.
A curve in a road has a radius of 240 m. If the road surface is level and on a
rainy day the coefficient of static friction is 0.48, what is the maximum speed
at which the car can negotiate this curve?
Consider cobalt-60 (⁶⁰CO) with a half-line of 5.25 years. How many years will it take for its activity to decrease to one-fourth of its original amount?
