Aheat engine operating between energy reservoirs at 20∘c and 600∘c has 30% of the maximum possible efficiency. you may want to review (pages 333 - 335) . part a how much energy must this engine extract from the hot reservoir to do 1000 j of work?

Identify the type of synthetic material used in each object

True or false: the revolution of the earth creates day and night as it rotates around the sun

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