A 300kg crate must be loaded from ground level onto a truck bed that is 1.75 meters above ground level. The movers have two choices. They can simply lift the crate onto the truck bed or they can use a 3.5m ramp that goes from the truck bed to the ground.

They call you for help (with understanding the options - not lifting the crate!). You agree to help and must now:

For each case determine the work done in moving the crate. Also for each case determine the Force required by the workers.

What option do you recommend?

How does the length of the ramp affect the situation?

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more

=force × distance a. work b. velocity c. pressure d. momentum

3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0