The most important, and least solvable, problem of coal power is generally agreed to be
A) its contribution to global warming.
B) accidents.
C) lack of sufficient coal resources.
D) its contribution to acid rain.
E) waste disposal.
A
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In each of the cases shown below, determine the direction of the magnetic field that is causing the charged particle to experience the magnetic force shown.
A. Forward
B. Backward
C. Rightward
D. Leftward
E . Into the paperF . Out of the paper
T . Impossible
Assume that the tile vectors for tiles on the shaded surface shown below point toward us. What is the sign of the current i that flows through this surface?
A. The signed current i is positive.
B. The signed current i is negative.
C. The signed current i is zero.
D. One cannot determine i’s sign from what is given.
When you place a stick in water and remove it, the stick is wet. If you instead place it in mercury the opposite occurs. The stick is dry. This is because adhesive forces are greater
A) between stick and water. B) between the stick and mercury. C) between the mercury and the water. D) none of the above
Three particles, each of which has a mass of 80 g, are positioned at the vertices of an equilateral triangle with sides of length 60 cm. The particles are connected by rods of negligible mass. What is the moment of inertia of this rigid body about an axis that is parallel to one side of the triangle and passes through the respective midpoints of the other two sides?
a. 0.018 kg/m2 b. 0.020 kg/m2 c. 0.016 kg/m2 d. 0.022 kg/m2 e. 0.032 kg/m2