Answer:
0 Joules
Explanation:
If you are pushing against a wall, the wall is not moving, so no work is being done.
The forces are Andrew poking the marble and then gravity pulling the marble downward
Answer:
The time required by the impulse to travel from foot to brain equals 0.019 seconds
Explanation:
For uniform motion the distance, speed, time are related by the equation

In our case since the person is 1.90 meters tall so the nerve impulse will have to cover a distance of 1.90 meters at a speed of 100 m/s.
Hence the time required for the impulse to travel from foot to the brain can be calculated as

<span>The sum of the protons and neutrons in an atom equals the mass number. </span>