How are Chemical rocks formed?
What will be an ideal response?
Formed by precipitation of minerals from water
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One target of the UN Millennium Development Goals that has successfully been reached involved cutting in half the number of people who lack access to
a. public education. b. information technology. c. international trade. d. safe drinking water.
Suppose Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be
A) 250 K, which is well below freezing. B) 273 K, or about the freezing point for water. C) 283 K, or about 5 K cooler than it is now. D) 288 K, or about the same as it is now. E) 293 K, or about 5 K warmer than it is now.
A parallel-plate capacitor has dimensions 4.3 cm × 4.6 cm. The plates are separated by a 1.0-mm thickness of paper (dielectric constant ? = 3.7). What is the charge that can be stored on this capacitor, when connected to a 1.2-V battery? (?0 = 8.85 × 10^?12 C2/N?m2)
a. 2.0 × 10^?12 C b. 3.9 × 10^?12 C c. 3.9 × 10^?11 C d. 7.8 × 10^?11 C e. 6.8 × 10^?11 C
As shown in the figure, a wire and a 10-? resistor are used to form a circuit in the shape of a square, 20 cm by 20 cm
A uniform but nonsteady magnetic field is directed into the plane of the circuit. The magnitude of the magnetic field is decreased from 1.50 T to 0.50 T in a time interval of 63 ms. The average induced current and its direction through the resistor, in this time interval, are closest to A) 63 mA, from b to a. B) 38 mA, from b to a. C) 63 mA, from a to b. D) 38 mA, from a to b. E) 95 mA, from a to b.