Recent content by tmobilerocks

In a way. The specific problem deals with a block released above a spring and compressing on it. I define Ug = Us= 0 as the uncompressed point and down as the positive direction. Up is therefore negative, so the block starts out with negative potential energy U = mgh (h is negative). Drawing a...

The block is below the reference point; h is negative. If you do mgh - mgh0 it becomes positive or mgh + mgh0

I drop a block on a spring compressing it. Let's say 0 potential energy is defined at spring equilibrium and down is positive direction. The spring is now compressed. The change in potential energy would be mgh + mgh0 right? (Needed to manually add positive sign to initial potential energy, up...

Hi All, I just have a question regarding potential energies. Say I have a block above a spring, and I define the potential energy of gravity and the spring to be zero at the uncompressed point. I then drop the block, trying to find the maximum compression of the spring using conservation of...

Homework Statement An auto manufacturer reports that the maximum power delivered by the engine of a car of mass 1230 kg is 92.4 kW. Find the minimum time in which the car could accelerate from rest to 29.1 m/s. In a test the time to do this is found to be 12.3 s. Account for the difference in...

How about a larger block (m3) moving to the left which exerts a normal force on m2. m2 is connected to m1 via a string. m2 and m1 have the right values so they do not move vertically; instead they move at the same acceleration as m3.

Man still not getting it... can someone please offer specific advice? I understand the principles. It must be accelerating to the left, but I can't think of a real life example.

Anyone else willing to offer more tips/guidelines to solving this problem?

Two blocks on table. Second block accelerating to left, exerting a normal force on first block. Person pulls down string on block.

So what is an example of a real situation?

Person just let's go off block originally held by hand

Will accelerate in normal force's direction

Block at rest on a rough wall. Man pulls the string attached to block to balance with static friction?

If you push with a horizontal force, canceling the normal force. Problem is I don't think you can add your own force.

The normal force would come from the surface, say a wall