A2.3kg box, starting from rest, is pushed up a ramp by a 10 n force parallel to the ramp. the ramp is 2.0 m long and tilted at 17 degrees. the speed of the box at the top of the ramp is 0.80m/s.how much work does the force do on the system? what is the change in the kinetic energy of the system? what is the change in the gravitational potential energy of the system? what is the change in the thermal energy of the system?
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Ответ:
Part a)
Part b)
Part c)
Part d)
Explanation:
Part a)
Work done by the applied force is given by the formula
here we know that
Part b)
As we know that the box was at rest initially and then it is moving with speed 0.80 m/s
so here we can say
Part c)
Change in gravitational potential energy is given as
Part d)
Now by energy conservation law we can say that
Work done by external agent = change in kinetic energy + change in potential energy + thermal energy lost
so we have
Ответ:
350 N
Explanation:
Given
Mass of ball is![0.5\ kg](/tpl/images/1355/1026/c0075.png)
Speed of ball after rebound is![v=2\ m/s](/tpl/images/1355/1026/f8654.png)
Time period for impulse![t=0.01\ s](/tpl/images/1355/1026/33a45.png)
Impulse imparted in equal to the change in the momentum of object
Impulse is the product of average force and duration of application