A person is declared to be dead upon the irreversible cessation of spontaneous body functions: brain activity, or blood circulation and respiration. However, only about 1% of a person's cells have to die in order for all of these things to happen. How can someone be dead when 99% of his or her cells are still alive?
What will be an ideal response?
A person can be considered dead with only a small fraction of their cells being dead, as those cells are responsible for coordinating the action of all the other cells, and for ultimately maintaining the homeostasis of the organism as a whole.
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A box that weighs 300 N is pulled across a level surface with a constant velocity. The rope makes an angle of 30.0 degree above the horizontal and the tension in the rope is 100 N. What is the normal force of the floor on the box?
A. 86 N B. 300 N C. 50 N D. 250 N E. 0 N
It's cold! You are sitting on what appears to be an ice-covered world (water ice). The Sun is low on the horizon and circles the horizon about once every 24 hours
Despite the low Sun, you can almost "feel" the skin cancers appearing on your exposed face (because there is little ozone to protect you). Despite these discomforts, you are pleased to find that the air is quite satisfactory; oxygen seems plentiful, and you are able to breathe even without the life-support belt.
A runner starts from rest and with an acceleration of 2.0 
travels a distance of 12 meters. The velocity of the runner at the end of the distance is
A. 3.4 m/s. B. 5.7 m/s. C. 6.9 m/s. D. 7.5 m/s. E. 8.1 m/s.
Compared with falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the
A) carpeted floor provides a smaller impulse. B) stopping time is shorter on the carpet. C) stopping time is longer on the carpet. D) carpet provides a smaller impulse and a longer time.