Why does hot air rise?

How does energy change from one form into another inside an animal?

Why does the sun appear to rise in the east and set in the west every day?

The sensitivity of a measuring instrument is the value of the smallest quantity that can be read or estimated with it. What is the smallest part of a centimeter that can be read with the following? (a) a meterstick with markings at each millimeter.

A sound that's produced by a single wave at a constant frequency and with no overtones is called a. a mellow sound. b. an average sound. c. a discordant sound. d. a pure sound

Which best describes why a liquid needs a container when a solid does not? Solids fill their containers, and liquide have definite shapes, Solids have definite shapes, and liquida fill their containere, Solids particles do not expand to fill their

The first law of thermodynamics states that ΔE = Q - W. Is this also a statement of the principle of conservation of energy? Yes, the heat added and the change in internal energy of the gas equal the work done by the piston.

How can we calculate the density of a sustance that has irregular volume

A two stage rocket leaves its launch pad moving vertically with an average acceleration of 4 m/s2. at 10 s after launch the first stage of the rocket (now without fuel) is released.

A liquid filled sealed system has cylinders with movable pistons on each end. The face of one piston has an area of 5 cm². The other piston has an area of 500 cm² and is supporting a weight of 2 kN on it.

A turntable is spinning on a frictionless axle when a ball of putty is dropped onto it from above. The putty sticks to the turntable when it lands. Is angular momentum conserved for the turntable and putty (the system) during this process?