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Chapter 1: Q8DQ (page 159)
A block rests on an inclined plane with enough friction to prevent it from sliding down. To start the block moving is it easier to push it up the plane or down the plane? Why?
To start the block moving, it is easier to push it down the plane.
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A cube of oak wood with very smooth faces normally floats in water. Suppose you submerge it completely and press one face flat against the bottom of a tank so that no water is under that face. Will the block float to the surface? Is there a buoyant force on it? Explain.
A patient with a dislocated shoulder is put into a traction apparatus as shown in Fig. P1.63.The pulls
have equal magnitudes and must combine to produce an outward traction force of 12.8 N on the patient鈥檚 arm.
How large should these pulls be?
A jet fighter pilot wishes to accelerate from rest at a constant acceleration of to reach Mach 3 (three times the speed of sound) as quickly as possible. Experimental tests reveal that he will black out if this acceleration lasts for more than5.0s. Usefor the speed of sound. (a) Will the period of acceleration last long enough to cause him to black out? (b) What is the greatest speed he can reach with an acceleration ofbefore he blacks out?
A rather ordinary middle-aged man is in the hospitalfor a routine checkup. The nurse writes 鈥�200鈥� on the patient鈥檚medical chart but forgets to include the units. Which of these quantities could the 200 plausibly represent? The patient鈥檚 (a) mass in kilograms; (b) height in meters; (c) height in centimeters;(d) height in millimeters; (e) age in months
Question- Neptunium. In the fall of 2002, scientists at Los Alamos National Laboratory determined that the critical mass of neptunium-237 is about 60 kg. The critical mass of a fissionable material is the minimum amount that must be brought together to start a nuclear chain reaction. Neptunium-237 has a density of 19.5 g/cm3. What would be the radius of a sphere of this material that has a critical mass?
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