The hummingbird shown here must beat its wings repeatedly to hover over flowers and drink nectar. what force does the beating of the hummingbird’s wings overcome?
a) entropy
b) gravity
c) inertia
d) momentum

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.