Aball is thrown with a horizontal velocity of 80 m/s from the top of a 250 m high building. how long will it be in the air?
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Ответ:
19.0 s
Explanation:
Since the motion of the ball is a free-fall motion, we can solve the problem by using the following suvat equation:
where, chosing upward as positive direction, we have:
s = -250 m is the displacement of the ball to reach the ground
u = +80 m/s is the initial velocity of the ball
t is the time
Re-writing the formula we have:
This is a second-order equation, so we solve it by applying the usual formula to find t:
And considering only the positive solution, from the calculation we get
t = 19.0 s
So, the ball will be in air for 19.0 s.
Ответ:
The pressure will be transmitted equally to all other parts of the confined fluid causing a general increase in pressure throughout the container.
Explanation:
This is in line with pascal's law of pressure which states that the pressure exerted on a given mass of fluid is transmitted undiminished to other parts of the fluid.