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Chapter 1: Q10DQ (page 123)
Suppose you chose the fundamental physical quantities to be force, length, and time instead of mass, length, and time. What would be the units of mass in terms of those fundamental quantities?
The unit of mass will be .
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A Fast Pitch. The fastest measured pitched baseball left the pitcher鈥檚 hand at a speed of . If the pitcher was in contact with the ball over a distance ofand produced constant acceleration, (a) what acceleration did he give the ball, and (b) how much time did it take him to pitch it?
You hold a hose at waist height and spray water horizontally with it. The hose nozzle has a diameter of 1.80 cm, and the water splashes on the ground a distance of 0.950 cm horizontally from the nozzle. If you constrict the nozzle to a diameter of 0.750 cm, how far from the nozzle, horizontally, will the water travel before it hits the ground? (Ignore air resistance.)
Equation (12.7) shows that an area ratio of 100 to 1 can give 100
times more output force than input force. Doesn鈥檛 this violate conservation
ofenergy? Explain.
(a) The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/day for males. Express this quantity in 碌g/day. (b) For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 75-kg adult receive? (c) A typical multivitamin tablet can contain 2.0 mg of vitamin B2 (riboflavin), and the RDA is 0.0030 g/day. How many such tablets should a person take each day to get the proper amount of this vitamin, if he gets none from other sources? (d) The RDA for the trace element selenium is 0.000070 g/day. Express this dose in mg/day.
A medical technician is trying to determine what percentage of a patient鈥檚 artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that it is , while in the region of blockage it is role="math" localid="1668168100834" . Furthermore, she knows that blood flowing through the normal artery just before the point of blockage is traveling at 30.0 cm/s, and the specific gravity of this patient鈥檚 blood is 1.06. What percentage of the cross-sectional area of the patient鈥檚 artery is blocked by the plaque?
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