Answer:
Explanation:
mass of the fellow ( m ) = 66kg
acceleration of fellow a
v = u + at
4.5 = 0 + a x 2
a = 4.5 /2
= 2.25 m / s²
Net force acting on fellow in upward direction by the surface of elevator
R - mg where R is reaction force of the surface of the elevator
Applying Newton's law of motion
R - mg = ma
R = m (g +a )
= 66 x ( 9.8 + 2 )
= 778.8 N
This will be the scale reading .
Answer:
most probably 5120J. or 32000x0.8= 25600J
Explanation:
the 1st machine has 20% efficiency. if we supply 32000 joules to the 1st machine then the work output is 32000x0.2 = 6400 J.
if this output from the 1st machine with an output of 6400J is passed through the second machine with an efficiency of 80% then we get 6400x.80 = 5120J.
Thermal energy comes from the ,movement of particles which produces heat, the faster the movement is the more heat
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The answer is: <em>Zero</em> work is done.
"Work", in the formal Physics usage, means a force acting through a distance. If you're holding a bag of apples UP but it's not moving UP, then your force is not moving through a distance, and the quantity of work is zero.
Explanation:
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