Answer:
Salt dissolving
Explanation:
Dis solving salt in water doesn't change it's chemical composition
Potential energy at top:
PE = mgh
PE = 40 x 9.81 x 12
P.E = 4,708.8 J
Kinetic energy at bottom:
KE = 1/2 mv²
KE = 1/2 x 40 x 10²
K.E = 2,000 J
P.E = K.E + Frictional losses
Frictional losses = 4708 - 2000
Frictional losses = 2708 J
The answer is D.
Answer:
I don't know answer. ssza
Answer:
9080 N
Explanation:
Consider the two motions of the ball.
In the downward motion, initial velocity, <em>u</em>, is 0 (because it falls from rest) and the distance is 28.7 m. Using the equation of motion and using <em>g</em> as 9.8 m/s²,
<em>v² = u² + 2as</em>
<em>v² = </em>0² + 2 × 9.8 × 28.7<em> </em>= 562.52
<em>v = </em>19.7 m/s
<em />
For the downward motion, the initial velocity is unknown, the final velocity is 0 and initial velocity is desired. <em>g</em> is negative because the motion is upwars.
<em>0² = v² - </em>2 × 9.8 × 19.8
<em>v² = </em>388.08
<em>v = </em>10.7 m/s
The change in momentum = 0.502(10.7 -(23.7)) = 21.7868 kgm/s
The impulse = change in monetum
Ft = 21.7868 kgm/s
But t = 2.4 ms
[\tex]
Answer:
1/6 is the answer of this question
Explanation: