Estimation: Estimate the number of times an average person's heart beats in a lifetime. Assume the average heart rate is 69 beats/min and a life span of 75 years.
A. 3 × 109 beats
B. 3 × 108 beats
C. 3 × 1010 beats
D. 3 × 107 beats
Answer: A
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When a car is weighed, it is driven slowly on a horizontal floor over a scale that records a reading as the front wheels go over the scale, and then records a second reading as the rear wheels go over the scale. The weight of the car is equal to
A) the sum of the two weights. B) the weight under the rear wheels. C) the weight under the front wheels. D) the difference of the two weights. E) the average of the two weights.
All people come very close to being able to float in water. What therefore is the volume (in cubic meters) of a 50-kg woman?
a. 0.007 b. 0.035 c. 0.050 d. 0.070 e. 0.085
A magnifier uses a:
a. diverging lens to form a real image. b. diverging lens to form a virtual image. c. converging lens to form a real image. d. converging lens to form a virtual image.
A centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration. A point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed
(a) What is the average angular acceleration of the centrifuge as it spins up? (b) How many revolutions does the centrifuge make as it goes from rest to its final angular speed?