Physics Question.....??????

You are on roller blades on top of a large hill. Your potential energy is equal to 1000 joules. Your mass is 60 kg.


What is your weight in Newtons?


What is the height of the hill?





Any help would really be appriciated. I really don't understand this stuff.

Physics Question.....??????
Your weight in newtons is related to your mass by this equation:


W= mg





So you weigh W=(60kg)(9.8 m/s/s) = 588 N





PE = mgh (This is the formula for gravitational potential energy)





1000 = (60)(9.8)h Solve this for h, and you'll have the height of the hill in meters.
Reply:Using Newton's Second Law of motion, Force=mass times acceleration (F=m*g), where g is the acceleration due to earth's gravity, the weight turns out to be F=(60kg)*(9.81m/sec^2)= 588.6 Newtons. And using the gravitational potential energy formula E=m*g*h, solving for: h=E/(m*g), the height is h=1.699 meters.


Hope this helps.
Reply:Potential energy = mass * gravity * height


you know potential energy, 1000 J


you know your mass, 60kg


and you know gravity, 9.8 m/s²


so


1000 = 60 * 9.8 * h


solve for h to find the height of the hill


For your weight in newtons, it is just


force = mass * acceleration


force is measured in newtons, and acceleration is the acceleration of gravity (9.8)


f = 60kg * 9.8m/s²


f = 588 kgm/s², and kgm/s² simplified is newtons, so 588 newtons



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