Answer:
Explanation:
See the attached figure . See the forces acting on man pulling up the box .
Man is stationary so net force acting on man is zero .
T + R = Wman
R is the reaction force of the ground of second floor .
R = Wman - T
Can you please help me with my school troubles grades are finalized tomorrow 13
<span>100000
Decibel (dB) is a logarithmic scale of power. Depending upon if you're looking for power, or root power a change in the power by a factor of 10 will be 10dB, or 20dB. Since this question is asking about "sound intensity" it's looking for a power factor, not a root-power factor (which would be the case for sound pressure). So we're looking for a 50 dB increase (100 dB - 50 dB) = 50 dB which means that we're wanting 10^5 = 100,000 times as much power. Assuming each identical voice contributes the same amount of power, you'd have 100,000 (one hundred thousand) voices talking at once for a sound intensity of 100 dB.</span>
Explanation:
a) m1u1 + m2u2 = v(m1+m2)
1000×6 + 5000×0 = v(1000+5000)
6000 + 0 = 6000v
v = 6000/6000
v = 1 m/s
b) ½ ×(m1+m2)v²
= 0.5×6000×1²
=0.5×6000
=3000J
=3KJ
c) solve for b4 collision and compare
Goodluck