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
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
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?