The existence of the world's subtropical deserts (such as the Sahara) is primarily due to
A) warm ocean currents.
B) strong prevailing northwesterly winds.
C) extremely high temperatures.
D) belts of atmospheric high pressure.
Answer: D
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The coefficient of friction between a block and the plane is 0.25 (see figure). The minimum horizontal force F (in newtons) required to cause the block to slide up the plane is:
(A) 827
(B) 714
(C) 609
(D) 522
Faraday's Law: A constant uniform magnetic field of 0.50 T is applied at right angles to the plane of a flat rectangular loop of area 3.0 × 10-3 m2. If the area of this loop changes steadily from its original value to a new value of 1.6 × 10-3 m2 in 1.6 s, what is the emf induced in the loop?
A. 1.6 × 10-2 V B. 0 V C. 7.5 × 10-2 V D. 4.4 × 10-4 V E. 9.0 × 10-2 V
What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?
A) the presence of many long, tall cliffs B) the presence of many impact craters C) the characteristics of the Caloris Basin D) Mercury's unusually high density
A 0.50-kg box is attached to an ideal spring of spring constant 20 N/m on a horizontal, frictionless floor
The box oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position. (a) What is the amplitude of vibration? (b) At what distance from the equilibrium position are the kinetic energy and the potential energy the same?