You push on a block on frictionless ice with a force of 8 N, causing it to accelerate at 2 m/s2 . The mass of the block is
a. 2 kg
b. 4 kg
c. 8 kg
d. 16 kg
e. 6 kg
B
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A person looking through eyeglasses sees real images
a. True b. False Indicate whether the statement is true or false
Energy in Capacitors: An ideal, isolated, air-filled parallel-plate capacitor is not connected to a battery but has equal and opposite charges of 3.9 nC on its plates. The separation between the plates initially is 1.2 mm, and for this separation the capacitance is 3.1 × 10-11 F. How much work must be done to pull the plates apart until their separation becomes 7.7 mm? (?0 = 8.85 × 10-12 C2/N ? m2)
Fill in the blank(s) with the appropriate word(s).
In California in 2001, the wholesale price of natural gas jumped from about $4 per thousand cubic feet to $11 . The former price translates into a cost of $0.04 per kWh for the utility, while the latter translates into $0.11 per kWh
California utilities can only charge around $0.08 per kWh. Given this price and assuming the other costs are the same as those in 1991, determine about where the fossil-fuel steam generation will be the same in cost as gas.
Swidden agriculture typically gives yields that are much higher than those in developed countries
What will be an ideal response?