Someone please help me out my physics hw

Posted on 2014-02-25 12:57:00 in Physics by SEOJIN

I'm taking physics 1 right now, and i don't get this homework so can someone please help me through with this physics hw?

I have two problems...

Here is question 1.



1. A worker pushes a 35.5 kg wheelbarrow 5.00 m along a level surface, exerting a constant

horizontal force of 50.0 N. A frictional force of 43.0 N acts on the wheelbarrow in a

direction opposite to that of the worker. You must show your work to get credit for this

problem.



a)What is work done by the worker on the wheelbarrow during this motion?

Work done by the worker = _______________________________________



b) What is the work done by friction during this motion?

Work done by friction on the wheelbarrow = _________________________

c) What is the net work done on the wheelbarrow during this motion?

Net work done on the wheelbarrow = ________________________________

d) Assuming the wheelbarrow starts from rest, what is its final speed, i.e. its speed when

it has traveled 5.0 m?

Speed at 5.0 m = ________________________________________...

e) What is its change in kinetic energy from the start of its motion to the 5.0 m mark?

Change in KE = ________________________________________...



f) Does Wnet = ?KE?



Here is the Second problem!



2. A 185 g cart is given a push up a frictionless incline, giving it an initial velocity of

1.45 m/s. The incline is at an angle of 10.0o to the horizontal. You must show your work to get full credit for this problem.



a) How far up the incline does the cart move before it stops, i.e. the distance along the

incline?

b) How much vertical displacement has occurred during its movement up the incline?



c) What is the cart’s initial kinetic energy, i.e. when it leaves the launcher?



d) What is the cart’s change in kinetic energy from the launch point to the point at which

it stops?



e) How much work has been done on the cart by gravity as it moved up the incline?



f) Using conservation of energy determine the vertical displacement of the cart,

assuming the initial velocity of 1.45 m/s.



Please help me!! i don't know how to figure it out

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