A certain brand of hot dog cooker applies a potential difference (120 V) to opposite ends of the hot dog and cooks by means of the joule heat produced. If 60 kJ is needed to cook each hot dog, what current is needed to cook four hot dogs simultaneously in 3.0 min?
A. 11 A
B. 2.8 A
C. 8.3 A
D. 2.1 A
E. 3.6 A
Answer: A
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A box is moved 10 m across a smooth floor by a force F making a downward angle with the floor, so that there is effectively a 4 N force acting parallel to the floor in the direction of motion and a 3 N force acting perpendicular to the floor. The force F acts for 20 seconds. The impulse delivered to the box by the floor during this process has magnitude
A. 60 Ns. B. zero. C. 100 Ns. D. 80 Ns. E. Can't tell without knowing the weight of the box
A very large sheet of a conductor carries a uniform charge density of 4.00 pC/mm2 on its surfaces. What is the electric field strength 3.00 mm outside the surface of the conductor? (?0 = 8.85 × 10-12 C2/N • m2)
A) 4.52 × 105 N/C B) 2.26 × 105 N/C C) 9.04 × 105 N/C D) 0.452 N/C E) 0.226 N/C
According to Einstein's mass-energy relation,
A) a heated object has slightly greater mass than the same object when it was cooler. B) a stretched rubber band has slightly greater mass than the same rubber band when unstretched. C) Both of the above. D) None of the above.
A sub-surface region that holds and transmits water is called a/an
A) aquifer. B) hydrometer. C) water table. D) aquiclude.