Help! All four are incorrect! A 15 kg block is accelerated at 1.6 m/s2 up a...

Question

Question

Help! All four are incorrect!

A 15 kg block is accelerated at 1.6 m/s² up a frictionless plane inclined at 5.0

Answer 1

Answer #1

time taken to reach the speed 36 m / s from 10 m/ s is t = ( v - u ) / a

= 16.25 s

(a) . the change in the block's mechanical energy = ( 1/ 2) m[v^ 2- u^ 2]

= 8970 J

E =8970 kJ

(b) the average rate at which energy is transferred to the block P = E / t

P = 552 W

(c). instantaneous rate of that transfer when the block's speed is 10 m/s is P ' = Fu

where F = ma

So, P ' = mau = W

(d) instantaneous rate of that transfer when the block's speed is 36 m/s is P " = Fv

P" = mav

= W

Answer 2

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