Why has NASA sent recent orbiters to Mars on trajectories that required them to skim through Mars's atmosphere before settling into their final orbits?
A) It saves money because the spacecraft uses atmospheric drag to slow down rather than needing to carry enough fuel to slow by firing rocket engines.
B) It allowed the orbiters to get higher resolution pictures of the surface as it came close when skimming through the atmosphere.
C) It allowed the spacecraft to collect samples of the atmospheric gas for return to Earth.
D) Each spacecraft also carried a lander, and the lander could only be dropped to the Martian surface when the spacecraft passed through the atmosphere.
A) It saves money because the spacecraft uses atmospheric drag to slow down rather than needing to carry enough fuel to slow by firing rocket engines.
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The ____________________ of a radioactive substance is the amount of time for the substance to be reduced by half
Fill in the blank(s) with correct word
A child pulls on a wagon with a force of 75N If the wagon moves a total of 42m in 3.1min what is the average power delivered by the child?
A) 21 W B) 22 W C) 26 W D) 17 W
Dams at two different locations are needed to form a lake. When the lake is filled, the water level will be at the top of both dams. The Dam #2 is twice as high and twice as wide as Dam #1 . How much greater is the force of the water on Dam #2 than the force on Dam #1? (Ignore atmospheric pressure; it is pushing on both sides of the dams.)
a. 2 b. 4 c. 8 d. 16
How can the electric field at a particular location from a collection of several different charges be calculated?
a. By calculating the average distance and average location of the charge, then the field from the average charge. b. By calculating the field from each charge and averaging their magnitude. c. By calculating the field from each charge and averaging the vectors giving each field. d. Calculate the field from each charge separately then add their magnitudes. e. Calculate the field from each charge separately then add these contributions as vectors.