A 1000-turn toroid has a central radius of 4.2 cm and is carrying a current of 1.7 A. The magnitude of the magnetic field along the central radius is
A)
8.1 × 10-3 T.
B)
5.1 × 10-2 T.
C)
1.6 × 10-2 T.
D)
8.1 × 10-2 T.
E)
0.
A
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One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
What is the power output, in hp, of this engine?
What is the symbol for the element whose atoms have 40 electrons each?
a. Ge b. Zr c. Ar d. None of these
A cyclist, traveling 12 m/s, wears a helmet that is close to being a 36-cm-diameter sphere. The drag force acting on that helmet is approximately:
(A) 1.8 N (B) 2.6 N (C) 3.2 N (D) 3.8 N
RC Circuits: For the circuit shown in the figure, V = 60 V, C = 40 µF, R = 0.90 M?, and the battery is ideal. Initially the switch S is open and the capacitor is uncharged. The switch is then closed at time t = 0.00 s. At a given instant after closing the switch, the potential difference across the capacitor is twice the potential difference across the resistor. At that instant, what is the charge on the capacitor? 
A. 1600 µC B. 1400 µC C. 1200 µC D. 890 µC E. 600 µC