A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400. He exerts a force F sufficient to accelerate the crate forward
At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration? A) 21.8°
B) 27.7°
C) 30°
D) 34.5°
E) 45°
A
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An ac generator with a total resistance of 12 ? contains 100 flat loops of wire, each with an area of 0.090 m2. The loops rotate at 60 rev/s in a magnetic field of magnitude 0.50 T. What is the maximum possible induced current?
A) 0.14 kA B) 23 A C) 46 A D) 0.28 kA
A galvanometer with a coil resistance of 40.0 ? deflects full scale for a current of 2.0 mA. What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for 50 V?
A) 25 k? B) 27 k? C) 29 k? D) 31 k? E) 35 k?
Index of Refraction: Light having a frequency in vacuum of 6.0 × 1014 Hz enters a liquid of refractive index 2.0. What is the frequency of the light in this liquid? (c = 3.0 × 108 m/s)
A. 12 × 1014 Hz B. 6.0 × 1014 Hz C. 3.0 × 1014 Hz D. 1.5 × 1014 Hz E. 2.0 × 1014 Hz
Which statement is the most accurate for falling objects on Earth?
A) Neglecting the effects of air resistance, heavy objects fall faster than light objects. B) All objects fall at roughly the same speed. C) Neglecting the effects of air resistance, light objects fall faster than heavy objects. D) Neglecting the effects of air resistance, all objects fall at roughly the same speed. E) Heavy objects fall significantly faster than light objects.