4
02
A scientist cooled the air inside a container.
02
1
The temperature of...
Physics, 15.12.2020 21:00 jalenshayewilliams
4
02
A scientist cooled the air inside a container.
02
1
The temperature of the air changed from 20 °C to 0 °C
The volume of the container of air stayed the same.
Explain how the motion of the air molecules caused the pressure in the container to
change as the temperature decreased.
[3 marks]
Answers: 1
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Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?
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Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.
Answers: 1
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An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?
Answers: 2
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