How much gpe does a 1 Kg eagle have when sitting in its nest 30 m above the ground?

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?