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Chapter 1: Q. 56 (page 31)
An intravenous saline drip has 9.0 g of sodium chloride per liter of water. By definition, 1 mL = 1 cm3 . Express the salt concentration in kg/m3
The concentration of sodium chloride in water is 9 kg/m3
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Ice hockey star Bruce Blades is 5.0 m from the blue line and gliding toward it at a speed of 4.0 m/s. You are 20 m from the blue line, directly behind Bruce. You want to pass the puck to
Bruce. With what speed should you shoot the puck down the ice so that it reaches Bruce exactly as he crosses the blue line?
Determine the signs (positive, negative, or zero) of the position, velocity, and acceleration for the particle in Figure Q1.6.
Problems 49 show a partial motion diagram. For each:
a. Complete the motion diagram by adding acceleration vectors.
b. Write a physics problem for which this is the correct motion
diagram. Be imaginative! Don鈥檛 forget to include enough
information to make the problem complete and to state clearly
what is to be found.
c. Draw a pictorial representation for your problem.
For Problem 36, draw a complete pictorial representation. Do not solve these problems or do any mathematics.
Sam is recklessly driving 60 mph in a 30 mph speed zone when he suddenly sees the police. He steps on the brakes and slows to 30 mph in three seconds, looking nonchalant as he passes the officer. How far does he travel while braking?
Estimate the average speed with which the hair on your head grows. Give your answer in both m/s and mm/hour. Briefly describe how you arrived at this estimate.
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