A galvanometer has a coil with a resistance of 24.0 ?, and a current of 180 ?A causes full-scale deflection. If the galvanometer is to be used to construct an ammeter that deflects full scale for 10.0 A, what shunt resistor is required?
A) 234 ?? B) 432 ?? C) 423 ?? D) 342 ??
B
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Which of the following would lead to a warmer temperature for a planet?
A) a decrease in the planet's reflectivity B) a decrease in the planet's amount of greenhouse gases C) a decrease in the brightness of the Sun D) a decrease in the number of volcanic eruptions on the planet
When an atom emits a photon, the atom's mass
A) decreases slightly. B) remains exactly the same. C) increases slightly. D) could do any of the above. E) becomes negative--i.e., less than zero.
The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?
A) f/4.0 B) f/2.0 C) f/5.6 D) f/0.30 E) f/0.40
A 50.0-kg box is being pulled along a horizontal surface by means of a rope that exerts a force of 250 N at an angle of 32.0° above the horizontal. The coefficient of kinetic friction between the box and the surface is 0.350
What is the acceleration of the box? A) 0.638 m/s2 B) 1.74 m/s2 C) 3.16 m/s2 D) 6.31 m/s2 E) 8.53 m/s2