A 2m crowbar is employed to lift a 200 kg load. What force must a man apply to one end of the crowbar when a stone (acting as a fulcrum) is placed under the crowbar 20 cm away from the end on which...

Using a wheel and axle machine, a force of 100 N applied to the rim of a wheel can lift a load of 80 kg .The diameters of the wheel and axle are 1 m and 80 cm respectively. Determine the actual mechanical...

A 95.25 kilogram object is traveling downward at incredible speed and slams into the ground (made entirely out of concrete). How fast must this object be going (assuming that the object has...

If I tear up a piece of paper in two, and than want to put it back as it was (reverse the process) why is it not possible and how is the reversal process called?

Are there any specific harmonics (or overtones) that create its distinct sound? Can you change the sound by playing the music differently? It is so hard to understand this concept, if you are...

A box that weighs 5.00x10^2 N is sliding down a ramp at a constant speed. The angle the ramp makes with the horizontal is 25 degrees. What is the coefficient of friction between the box and the ramp...

There are many optical phenomena in the sky. To name 3: rainbows, sundogs and mirages. Explain fully how each one if formed, including how they are the same or different. Why we only see a rainbow...

Hey I'm i have a physics test in a few days and am really not understanding coefficients of friction and those type of questions. I'll give you an example of what I'm dealing with..    1)...

Suppose Spider-Man throws a web that is 1.00 m long with a velocity of 0.8c (γ = 5/3) with respect to the Earth. What will be the length of web as observed by J. Jonah Jameson standing on the Earth...

I think a) is (b-y)^2 + x^2 = L^2; the second derivative of this can be taken to get the actual accelerations.  I can't get b) though. Have been stuck on this for a while! Thank you!...