What directly controls breathing, heartbeat, and muscle movement in the human body?

A. electrical signals

B. chemical reactions

C. variations in temperature

D. the heart

Now consider the statements in Part A that are inferred from models. A solar model is used to calculate interior conditions based on certain "known" characteristics of the Sun, such the Sun's total mass. How do we know the Sun's mass? a.

Which is a freshwater region characterized as a large standing body of water? A. lake B. river C. ocean D. stream

A balloon drifts 30 m toward the east in 10 s; then the wind suddenly changes and the balloon flies 50 m toward the west in the next 5 s. What was its displacement during the first 10 s?

A substance that is made up of the only one kind of atom is a (an) a.) solution b.) homogeneous mixture c.) element d.) compound

Gamma rays are waves of energy that have no charge. a. True b. False

While playing with her 5 year old cousin, a Physics 135 student pushed him forward on his scooter. She pushes with a force of 50 Newtons for 3.5 seconds. If the boy and the scooter together have a mass of 30 kg, what is their final velocity? a. 2.

3. A 120.0 V generator supplies 3.0 kw of power. How much current ca the generator deliver?

An apple drops from a tree and hits the ground in 1.5s what is its speed just before it hits the ground?

Sound travels slow in cold air. Why does the speed of sound depend on air temperature?

A tow truck pulls a 500 kg car so that the car accelerates 2 m/s2. What is the net force on the car? 250 N 498 N 1000 N 502 N