The percentage by mass of carbon in methane, CH4, is about
a. 25%.
b. 75%.
c. 80%.
d. 20%.
b
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Which of the following is closest in mass to a white dwarf?
A) the Sun B) the Moon C) the Earth D) Jupiter
Which of the beams is due to a positively charged helium nucleus?
A) a B) b C) c D) all of the above E) none of the above
A U-tube is partially filled with water and then an immiscible liquid is added to the right side. The top of the liquid is a distance h1 = 2.40 cm above the level of interface between the liquid and water. On the left side of the tube the top of the water is a distance h2 = 1.48 cm above the liquid-water interface on the right side. What is the density of the liquid in terms of the density of
water, 1 000 kg/m3? a. 1 620 kg/m3 b. 617 kg/m3 c. 622 kg/m3 d. 237 kg/m3
To recharge a 12-V battery, a battery charger must move 3.6 × 105 C of charge from the negative to the positive terminal. What amount of work is done by the battery charger? How many kilowatt hours is this?
What will be an ideal response?