Answer:
B. Temperatures remain high as lowered pressures decrease melting temperatures.
Explanation:
Rocks , like ice , contracts on melting so , their melting point decreases on decrease in pressure . When hot solid rocks are pushed towards the surface of the earth, due to decrease in pressure , their melting point decreases , so the solid rocks starts melting without any addition of heat . Their present temperature becomes more than their melting point.
<span>hysics is a natural science that also encompasses concepts like force and motion. The primary goal of physics is to understand how the universe behave
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Given is the velocity of the bus at 25 meters per second. Then it decelerates steadily. It stops after 40 seconds. To calculate for the acceleration, use this formula:
a = (vf - vo) / t
vf = 0 m/s (complete stop)
vo = 25 m/s
t = 40 s
Therefore,
a = (0 - 25) m/s / 40 s
a = - 0.625 m/s^2
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Answer:
Explanation:
<u>Net Force</u>
Newton's second law explains the dynamics principles when a number of forces are applied to an object.
The net force vector is the sum of the individual vector forces applied. The magnitude of the net force is related to the magnitude of the acceleration of the body as follows:
Furthermore, the acceleration can be calculated if we know the kinematic behavior of the body:
Where vf, vo, and t are the final speed, initial speed, and time, respectively.
The box is pushed across the floor with a force of 25 N against a frictional force of 14 N.
The net force applied to the box is:
We also know the box is accelerated from rest (vo=0) to vf=4 m/s in t=16 seconds, thus:
From the equation:
We solve for m:
