The change in pitch of a train's horn as it passes while you are standing still can be explained by

a. sympathetic vibration.

b. ultrasonic vibrations.

c. resonance.

d. the Doppler effect.

What scientific evidence supports the Big Bang theory? Universe expansion Redshift Composition of the universe All of the above None of the above

Who stated that animals as well as plants are made of cells

Which of the following is not a type of system? Biomedical Ecological Social Biological (not sure if this is physics but it doesn't give me the option to pick science for subject)

The primary coil of a transformer contains 100 turns; the secondary has 200 turns. the primary coil is connected to a size-aa battery that supplies a constant voltage of 1.5 volts. what voltage would be measured across the secondary coil?

This is a slide of human cheek cells. After scraping the inside of their mouths, students in Ms. Gordon's class smeared the swab on a slide and stained them blue. These cells are parts of a large, complex organism, a human. But these cells.

Sulfur oxides (SO2) are responsible for A) global warming. B) greenhouse gases. C) producing acid rain. D) destroying the ozone layer.

During a collision between a photon and an electron, there is conservation of

To produce change in motion, a force must be a (n) A) balanced force B) unbalanced force C) frictional force D) gravitational force

What is meant when Earth's systems are said to be "dynamic"? they are all the same type they are slow moving they cannot be measured they are constantly changing

Which of the following statements about electrons is FALSE? Group of answer choices the closer an electron is to the nucleus, the more strongly the electron is attracted to the nucleus and therefore the more potential energy the electron has