Part of the current atmosphere of Earth is believed to be
a. the remnants of the original hydrogen and helium gas from the solar nebula attracted by the protoplanet.
b. the result of the melting and vaporizing of the glaciers from the last ice age.
c. composed primarily of hydrogen and helium.
d. composed of gases that were outgassed from the heated rocks sometime after the planet formed.
e. the result of a collision between the sun and another star.
D
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The backscattered image from an SEM is primarily dependent upon the atomic _________of the elements in the sample.
Fill in the blank(s) with the appropriate word(s).
Uniform Circular Motion: A car moving at a steady 10 m/s on a level highway encounters a depression that has a circular cross-section with a radius of 30 m. The car maintains its speed as it drives through the depression. What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression?
A. 200 N B. 390 N C. 790 N D. 490 N E. 590 N
A possible means of spaceflight is to place a perfectly reflecting aluminized sheet into Earth orbit and use the light from the Sun to push this solar sail. If a huge sail of area 6.00 × 105 m2 and mass 6000 kg were placed into orbit and turned toward the Sun, what would be the force exerted on the sail? (Assume a solar intensity of 1380 W/m2.)
What will be an ideal response?
The international standard time is called ______________
Fill in the blank(s) with correct word