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Home Q & A Board Science-Related Homework Help Physics Astronomy
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MapHarr MapHarr
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6 years ago
The uncertainty in the position of a proton is 0.053 nm. What is the uncertainty in its speed?
 
  A) 2.2 m/s
  B) 0.60 km/s
  C) 0.98 km/s
  D) 37. m/s
  E) 1.2 km/s

Question 2

The main practical problem associated with building an interstellar ramjet is
 
  A) making the ship large enough to scoop up enough hydrogen fuel given that the density of hydrogen in space is so low
  B) producing enough thrust to accelerate the spacecraft to a high enough speed
  C) separating the matter and antimatter fuels from each other
  D) receiving enough photon energy to propel the craft

Question 3

What change in wavelength is expected when X-rays are scattered at 90?
 
  A) no change at this angle
  B) 4.84  10-3 nm
  C) 2.42  10-3 nm
  D) 1.18  10-3 nm
  E) 3.75  10-3 nm

Question 4

One 20-year-old twin brother takes a space trip with a speed of 0.80c for 30 years according to a clock on the spaceship. Upon returning to the Earth, what is his own age and the age of the Earth-based twin brother?
 
  A) 20; 30
  B) 30; 50
  C) 40; 60
  D) 50; 70
  E) 70; 90
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RochellleeeeRochellleeee
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6 years ago
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MapHarr Author
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6 years ago
Smiling Face with Glasses Feeling super confident now, TY
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