1. why does earth's moon have no atmosphere
- the average temp is too high
-there are no plants to release oxygen
-the moon is too far from earth
-the moon's gravity is too weak to hold onto gas molecules

2. on the moon , maria are
-meteoroid craters
-low flat plains
-rough mountains
-lunar seas filled with water

Give an example in which the electrical energy changes to light energy

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?

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