Newtons first law of motion states that an object at rest will remain at rest and an object in motion will stay in motion unless acted upon by an unbalanced force. Seat belts and air bags provide the stopping force for the crash test dummies.
Answer:
The pressure of the water in the pipe is 129554 Pa.
Explanation:
<em>There are wrongly written values on the proposal, the atmospheric pressure must be 101105 Pa, and the density of water 1001.03 kg/m3, those values are the ones that make sense with the known ones.</em>
We start usign the continuity equation, and always considering point 1 a point inside the pipe and point 2 a point in the nozzle:
We want 
, and take into account that the areas are circular:
Substituting values we have (we don't need to convert the cm because they cancel out between them anyway):
For determining the absolute pressure of the water in the pipe we use the Bernoulli equation:
Since the tube is horizontal 
and those terms cancel out, so the pressure of the water in the pipe will be:
And substituting for the values we have, considering the pressure in the nozzle is the atmosphere pressure since it is exposed to it we obtain:
Answer:
less than 20580 N
Explanation:
According to the newton's second law of motion
Force = mass * acceleration
(assuming gravitational acceleration =9.8 m/s2 )
acceleration = 30*9.8 = 294 m/s2
acting Force = 70 * 294
= 20580 N
Since the acceleration was less than 30g , acting force should also be less than 20580 N
By v = u - at
<span>=>8 = 12 - a x 0.25 </span>
<span>=>a = 4/0.25 km/hr/sec </span>
<span>=>a = 16km/hr/sec
I hope this helped!</span>
Answer:
see below
Explanation:
this is because particles in solids are packed very closely together, thus , the particles collide with each other frequently and thus transfer of energy is faster. however, particles in liquid are closely packed but not as close as in solid so the particles do not collide as frequently. thus, transfer of energy slower than in solid. furthermore, the particles in gas are spaced far apart from each other, thus the particles don't collide with each other frequently, thus transfer of energy is very slow in gas.
hope you get it,
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