The SI unit of mass, the kilogram, is currently defined
A) as 10-22 the mass of the Earth's moon.
B) as 10-24 the mass of the Earth.
C) by the President's weight.
D) by a prototype platinum-iridium cylinder kept at the International Bureau of Weights and Measures in Sevres, France.
E) the mass of 5.9786332 × 1026 protons.
D
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The heat of fusion for ice at 0 
is 333.7 kJ/kg. What is the energy needed to melt 100 grams of ice at 0.00
A. 39.4 kJ B. 12.7 kJ C. 17.5 kJ D. 25.5 kJ E. 33.4 kJ
Describe how the inflationary model of the early universe, a current matter density equal to the critical density, and dark matter are related
What will be an ideal response?
Jamal pulls a 150-N sled up a 28.0° slope at constant speed by a force of 120 N. Near the top of the hill he releases the sled. With what acceleration does the sled go down the hill?
a. 1.20 m/s2 c. 2.22 m/s2 b. 1.36 m/s2 d. 2.67 m/s2
A 5.0 cm focal length lens is used as a magnifier. Assuming a near point of 25 cm, about what magnification is attained?
A. 25 B. 10 C. 60 D. 1.2 E. no value given is within 2 of an appropriate answer