Vector = 4.00 m points eastward and vector = 3.00 m points northward. The resultant vector + is given by
A) 5.00 m at an angle 71.6° north of east.
B) 5.00 m at an angle 36.9° north of east.
C) 5.00 m at an angle 53.1° north of east.
D) 5.00 m at an angle 18.4° north of east.
E) 5.00 m at an angle 26.6° north of east.
B
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The acceleration due to gravity near the surface of the Moon is about one-sixth of the value near the Earth's surface. If a rock were dropped from equal heights on the Moon and Earth, the time it would take the rock from the Moon to hit the ground would be
A. six times longer than on Earth. B. the square root of six times shorter than on Earth. C. the same time as on Earth. D. six times shorter than on Earth. E. the square root of six times longer than on Earth.
How much heat is required to change 456 g of ice at -25.0°C into water at 25.0°C? The specific heat of ice is 2090 J/(kg K) and the latent heat of fusion of water is 33.5 × 104 J/kg
A) 224 kJ B) 153 kJ C) 112 kJ D) 71.5 kJ E) 72.5 kJ
Suppose current is flowing in a wire from right to left. Which way do the electrons in the wire move?
a. right to left b. left to right c. in circles d. It is impossible to tell.
Which of the solenoids described below has the greatest magnetic field along its axis?
A) a solenoid of length L, with N turns and a current I B) a solenoid of length L, with N/2 turns and a current I C) a solenoid of length L/2, with N/2 turns and a current I D) a solenoid of length 2L, with N turns and a current I/2 E) a solenoid of length 2L, with 2N turns and a current 2I