On a position-time graph for a particle, suppose the plot starts at some positive position and as the time goes on the curve gets steeper and steeper while curving upwards. Which of the following must be true?
a. The speed of the particle is constant. b. The acceleration of the particle is constant.
c. The speed of the particle is decreasing. d. The acceleration of the particle is positive.
d
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Vision Problems: A farsighted person cannot see clearly objects that are closer to her eyes than 60.0 cm. Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable her to comfortably see the objects at a distance of 25.0 cm from her eyes?
A. -42.9 cm, +2.33 diopters B. -42.9 cm, -2.33 diopters C. +42.9 cm, +2.33 diopters D. +42.9 cm, -2.33 diopters E. +60 cm, +42.9 diopters
A string with fixed ends is made to go into standing wave patterns. At a given tension, the lowest frequency for which such a pattern exists is 150 Hz. Which of the following frequencies would also cause a standing wave pattern in this case?
a. 250 Hz b. 500 Hz c. 750 Hz d. All of the above frequencies will cause a standing wave pattern in this case.
A bar (L = 80 cm) moves on two frictionless rails, as shown, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 m?, what is the magnetic force on the moving bar?
A. 0.48 N to the right B. 0.48 N to the left C. 0.32 N to the left D. 0.32 N to the right E. None of the above
A flask half filled with water is on a weighing scale. If you float a piece of wood in it, the scale reading will be
A) less. B) the same. C) greater.