Recent content by emilykorth

Homework Statement A single force acts on a 5.0 kg particle-like object in such a way that the position of the object as a function of time is given by x = 3.0t - 4.0t ^2 + 1.0t ^3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to t = 2.0 s...

wow I was making a really stupid mistake. Thanks for the help, I figured it out

Homework Statement If a ski lift raises 100 passengers averaging 668 N in weight to a height of 175 m in 60 s, at constant speed, what average power is required of the force making the lift? Homework Equations P_instantaneous=Fv P=W/t W=Fd The Attempt at a Solution I tried to solve...

so is h just the h given or would it be h+x?

ok yes i think so...so when a spring is compressed it has just PE thank you

yes but wouldn't the gravitational PE of the block involve the height that is given since the block is traveling not only the height but the distance that the spring is compressed? so wouldn't that be mg(h+x)?I have no idea what the potential energy of the block and spring would be when...

it would be -x which is what I am trying to find

gravitational potential of the spring-would it be 1/2kx^2?

mgh?

When the spring reaches maximum compression there would be no kinetic energy since the block will eventually have no velocity and will stop. Would the KE of the spring be Wspring=-1/2kx^2?

so how can I vary the equation to make it right? mgh+1/2mv^2=1/2kx^2?

Homework Statement A block of mass m = 2.0 kg is dropped from height h = 55 cm onto a spring of spring constant k = 1960 N/m (Fig. 8-36). Find the maximum distance the spring is compressed. Homework Equations PEspring=1/2 kx2 F=-kx PE gravity=mgh KE gravity=1/2mv2 The...

How do you do this? A block of mass m = 2.0 kg is dropped from height h = 55 cm onto a spring of spring constant k = 1960 N/m . Find the maximum distance the spring is compressed. m