Which of these is a source for particulate matter in the air?

a. automobiles

b. dust

c. fires

d. all of the above

1. A student studying a circuit diagram of a lightbulb, battery, and a switch correctly identifies it as a closer circuit. In this diagram, The lightbulb would be a. an insulator b. on c. disconnected d. off 2.

What did newton's law of universal gravitation tell us about how gravity works?

A student places one end of an iron nail in a cup of boiling water. Eventually, the whole nail is hot. He says that the heat transferred through the nail by convection.

What is the magnitude of B? speed=2.64*10^7 radius. 160m R=mv/|q|B,

You are standing on a train station platform as a train goes by close to you. As the train approaches, you hear the whistle sound at a frequency of f1 = 95 Hz. As the train recedes, you hear the whistle sound at a frequency of f2 = 78 Hz.

A certain rain cloud at an altitude of 1.80 km contains 3.20 107 kg of water vapor. How long would it take for a 2.90-kW pump to raise the amount of water from Earth's surface to the cloud's position?

The law of conservation of energy states that A) energy may be created, destroyed or transformed. B) energy may be created, but only in certain types of nuclear reactions. C) energy may neither be created nor destroyed; it may only be transformed.

Pushing a rock from a hill top is called

What is a pulsar? a. the remains of a low-mass star after it explodes b. a spinning neutron star emitted radio waves c. another name for a protostar d. the stage before a dying star becomes a supernova

Can we divide two vectors?