When sunlight strikes Earth, approximately
a. 30% is reflected back into space
70% is reflected back into space
c. 50% is absorbed by the atmosphere
d. 80% is absorbed by land and oceans
b.
700

How much work would a child do while puling a 12-kg wagon a distance of 3m with a 22 n force directed 30 degrees with respect to the horizontal? (a) 82j (b) 52j (c) 109j (d) 95j

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)