Physics questions..? Help on how?

Posted on 2015-10-07 05:54:00 in Physics by KAYAL

1)The aorta is a major artery, rising upward from the left ventricle of the heart and curving down to carry blood to the abdomen and lower half of the body. The curved artery can be approximated as a semicircular arch whose diameter is 5.9 cm. If blood flows through the aortic arch at a speed of 0.18 m/s, what is the magnitude (in m/s2) of the blood's centripetal acceleration?

2)There is a clever kitchen gadget for drying lettuce leaves after you wash them. It consists of a cylindrical container mounted so that it can be rotated about its axis by turning a hand crank. The outer wall of the cylinder is perforated with small holes. You put the wet leaves in the container and turn the crank to spin off the water. The radius of the container is 10 cm. When the cylinder is rotating at 2.4 revolutions per second, what is the magnitude of the centripetal acceleration at the outer wall?

3)A shot-putter puts a shot (weight = 70.6 N) that leaves his hand at distance of 1.56 m above the ground.
(a) Find the work done by the gravitation force when the shot has risen to a height of 2.15 m above the ground. Include the correct sign for work. ___J
(b) Determine the change (?PE = PEf - PE0) in the gravitational potential energy of the shot. ___J

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