In what two ways can a machine be made to be more efficient?

Insects breathe by using a system called tracheae. where are these tubes located on an insect

What unit is used to measure weighted average atomic mass?

A typical carbon atom has six protons, six neutrons, and six electrons. Which of these has the least amount of mass? A) one Proton B) one Neutron C) six Electrons D) These masses are too tiny to measure

A plant uses energy from the Sun to make food. What kind of energy transformation is this?

How does Photosynthesis use solar energy? The sun starts the process of the plant growing and then it doesn't do anything else. The sun's energy creates an area for the plant to be warm and happy. The sun's energy is converted to heat.

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.

3. Calculate the amount of current through a 45-watt light bulb that is connected to a 120-volt circuit in your home.

Are oranges called oranges because oranges are orange, or is orange called orange because oranges are orange?

An object at rest has no net force acting on it. a. True b. False

A baseball has mass 0.145 kg. (a) If the velocity of a pitched ball has a magnitude of and the batted ball's velocity is in the opposite direction, find the magnitude of the change in momentum of the ball and of the impulse applied to it by the bat.