Why does a balloon filled with hydrogen rises up only to a certain height

What are two landforms made from plate movement

Transverse waves are to radio waves as longitudinal waves are to (1) light waves (3) ultraviolet waves (2) microwaves (4) sound waves

Scientific endeavor is sometimes accompanied by negative tradeoffs. true or false? : 0

Most papers do not reflect light very well because its surface is somewhat rough. State True or False.

Which statements describe a closed circuit? Check all that apply. Bulbs will shine. Bulbs will not shine. The circuit is incomplete. The circuit is complete. Charges flow. Charges do not flow.

8. A thin slice of silicon that contains many solid-state components is a (n) A) Transistor B) Intergratef circuit C) Diode D) Cathode-ray tube 9. A current of 6.0 amps passed through a motor that has a resistance of 5.0 ohms.

Warm moving air makes what?

Which of the following should a scalar measurement have? a. magnitude b. description c. direction d. unit

A woodchuck runs 25 m to the right in 7 s, then turns and runs 12 m to the left in 3 s. (Assume motion to the right is positive. Where applicable, indicate the direction with the sign of your answer. Enter your answers in m/s.

Calculate the current in a circuit whose total resistance is 4 ohms and whose emf is 12 volts. 0.3 3 5 50