When a microwave filter consisting of vertical parallel metal rods is in the absorbing position, oscillating currents are set up in the rods. At any one instant, the current in each rod has the same magnitude and direction. At that instant
A. the rods will try to move apart horizontally.
B. the rods will try to move together horizontally.
C. the rods will try to shift vertically upwards.
D. the rods will try to shift vertically downwards.
E. the rods will not be affected because the source of current is not a battery.
Answer: B
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Which of the following correctly describes the situation when Jackie returns to Earth? (Ages in this problem refer to biological ages—that is, how much time has passed for each sister since she was born.)
A) It's the year 2050, and both twin sisters are 70 years old. B) It's the year 2050. Gwen (who stayed home) is 70 years old, but Jackie is only a little older than her age of 20 when she left. C) It's the year 2050. Gwen is 70 years old. Jackie is 19. D) It's the year 2100. Gwen and Jackie are both 120 years old. E) According to Gwen, Jackie returns to Earth in the year 2050, but according to Jackie, she returns in the year 2001.
What is 34 + ( 3 ) × (1.2465 ) written with the correct number of significant figures?
A) 37.7 B) 37.74 C) 4 × 101 D) 38 E) 37.7395
Impulse: A super dart of mass 20 g, traveling at 350 m/s, strikes a steel plate at an angle of 30° with the plane of the plate, as shown in the figure. It bounces off the plate at the same angle but at a speed of 320 m/s. What is the magnitude of the impulse that the plate gives to the bullet?
A. 0.52 N ? s B. 4.3 N ? s C. 300 N ? s D. 6.7 N ? s E. 0.30 N ? s
A boat travels upstream and after one hour has gone 10 km. The boat next travels downstream and after one hour has gone 18 km. If the boat's speed relative to the water is constant, what is the speed of the current in the river?
a. 3 km/h b. 4 km/h c. 5 km/h d. 6 km/h e. 7 km/h