What is the main difference between a soap and a detergent?
A) Soaps are made from fatty acids, detergents are synthetic.
B) Soaps are biodegradable, detergents are not.
C) Detergents are better than soaps.
D) Soaps are all natural.
E) Soaps and detergents are exactly the same.
Answer: A
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A box of mass 72 kg is at rest on a horizontal frictionless surface. A constant horizontal force of magnitude F then is exerted on the box, accelerating it to the right. You observe that it takes the box 3.4 seconds to travel 13 meters
What is the magnitude of the force F?
A 600-kg car makes a 90° turn. Its speed before the turn is 21.0 m/s and after the turn it is 24.0 m/s. What is the magnitude of the change in the car's momentum during the turn?
A) 19.1 × 103 kg?m/s B) 10.2 × 103 kg?m/s C) 9.55 × 103 kg?m/s D) 12.0 × 103 kg?m/s E) 22.2 × 103 kg?m/s
A hockey puck slides across a frozen pond. If ice friction and air resistance are neglected, the force needed to keep the puck sliding at constant velocity is
A) 0 N. B) equal to the weight of the puck. C) the weight of the puck divided by the mass of the puck. D) the mass of the puck multiplied by 10 m/s2. E) none of the above
What prevents a large piece of uranium ore from going naturally into a chain reaction?
a. Because none of its nuclei fission without bombardment from human-controlled sources. b. Because even a small chunk is too large to sustain a chain reaction. c. Because the sample is not large enough to capture many neutrons. d. Because there isn't enough uranium for fissioning neutrons to trigger another reaction. e. Because so many of its fissioning neutrons are captured by uranium-238 which then decays in other ways.