An object of mass 20.0 kg is lifted vertically through 1.00 m by a 400 N force. How much work is done by the net force in lifting this object? Use g = 10.0 m/s2
A) 20.0 J
B) 40.0 J
C) 100 J
D) 200 J
E) 400 J
D
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Two point charges, separated by 15 cm, have charge values of +2.0 µC and -4.0 µC, respectively. What is the value of the mutual force between them? (ke = 8.99 × 10^9 N×m2/C2)
a. 8.0 × 10^-12 N c. 320 N b. 3.6 × 10^-8 N d. 3.2 N
What conditions are thought to be necessary for a terrestrial planet to have a strong magnetic field?
A) a molten metallic core only B) fast rotation only C) a rocky mantle only D) both a molten metallic core and reasonably fast rotation E) both a metal core and a rocky mantle
A platinum wire that is 1.20 m long has a radius of 0.500 mm and is fixed at both ends. In its third harmonic it vibrates at 512 Hz. The density of platinum is 21.4 × 103 kg/m3. What is the tension in the wire?
A) 4.00 kN B) 2.00 kN C) 2.82 kN D) 1.41 kN E) 1.00 kN
The greenhouse effect occurs because carbon dioxide is opaque to infrared radiation
Indicate whether the statement is true or false