If a rock is skipped into a lake at 24 m/s2, with that what force was the rock thrown if it was 1.75kg?
1 answer:
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Answer:
F = 749 [N]
Explanation:
We must give full information on this problem, as well as the question that needs to be resolved.
Water at 20°C flows through a 5-cm-diameter pipe that has a 180° vertical bend. The total length of pipe between flanges 1 and 2 is 75 cm. When the weight flow rate is 230 N/s,
P1=165kPa
and
P2=134kPa
Neglecting pipe weight, determine the total force that the flanges must withstand for this flow.
We must make a U-shaped body diagram of the pipe in order to visualize the forces acting according to the pressures and the area of the pipe.
Then by means of the second law of motion of Newton, which says that the sum of the forces must be equal to the product of mass times acceleration, we can find the force Fp
Let us remember that pressure is defined as the divided force over the area, therefore:
F = P *A
where:
P = pressure
A = area
The product of the mass by acceleration, is equal to the product of the speed of the fluid by the mass flow, since we know the weight of the fluid we can find its mass flow.
In the function of the mass flow, we can find the velocity of the fluid, as we also know the diameter of the pipe
We know that the atmospheric pressure is equal to:
The value of the pipe area is calculated for a circular section
The resultant force is 749 [N]
The solution of the equations and the free body diagram can be seen in the attached picture.
The distance to a lightning bolt can be determined by counting the seconds between the flash and the sound of thunder due to the speed of light is greater than the speed of sound
We must consider that the speed of light (3.00× 10⁸ m/s) is greater than the speed of sound (340 m/s), this is why we can first see the lightning and after seeing it we can hear it.
In order to calculate the distance we must count the time since the lightning bolt and use the speed of sound, applying the following formula:
x = v * t
Where:
- x = distance
- t = time
- v = velocity
It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).
Learn more about velocity at: brainly.com/question/80295?source=archive
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