Answer:
acceleration a = 1.04 m/s2
Explanation:
Assume the train has a speed of 23m/s when the last car passes the railway workers. Once this happens the last car would have traveled a total distance of the 180m distance between the railway worker standing 180 m from where the front of the train started plus the 75m distance from the first car to the last car:
s = 75 + 180 = 255 m
We can use the following equation of motion to find out the distance traveled by the car:
where v = 23 m/s is the velocity of the car when it passes the worker, = 0m/s is the initial velocity of the car when it starts, a m/s2 is the acceleration, which we are looking for.
Answer:
independent” variable goes on the x-axis (the bottom, horizontal one) and the “dependent” variable goes on the y-axis (the left side, vertical one).
Explanation:
this is the answer I don't know if it's right
A person is attracted towards the center of Earth by a 440 N gravitational force. The force with which Earth is attracted toward the person is <u>440 N</u>.
<u><em>Reason</em></u><em>: If you were to consider Newton's third law, it says for every action, there is an equal and opposite reaction. That means if the earth exerts a 440N force on the human, then the human will exert a 440N force on the planet.</em>
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p.s. Newton's three laws would be very helpful to know for these sorts of conceptual questions that involve forces
Answer:
Local atmospheric pressure in kPa = 97.932 kPa
Local atmospheric pressure in mm Hg = 734.78 mm Hg
Explanation:
Given:
- = absolute pressure = 46 kPa = 46000 kPa
- = density of air =
- = density of mercury =
- = altitude of the plane = 6400 m
Assume:
- = pressure decrease due to air at height h
- = local atmospheric pressure
As we go up the altitude, the pressure decreases. So, the reading of the pressure will be equal to the decrease in pressure due to height subtracted from the local atmospheric pressure.
Now, conversion of the local atmospheric pressure is quite simple. let us assume that height of H mm of Hg is required to exert a pressure equivalent to the local atmospheric pressure.
Hence, 734.78 mm Hg is the local atmospheric pressure in mm Hg.
Answer:
B would be the correct answer