A hot air balloon contains 85,000 moles of air. To what temperature must the

air be heated to fill a volume of 2500 m at a pressure of 100 kPa? A. 260K

B. 2900 K C. 350 K

D. 0.35 K

The Doppler effect suggest that sound waves are relative to the observer. You know if an object is coming or going from the sound it makes. Light waves follow the Doppler effect also.

Light-rail passenger trains that provide transportation within and between cities speed up and slow down with a nearly constant (and quite modest) acceleration. A train travels through a congested part of town at 6.0 m/s.

How is the smell from a stinky diaper similar to the electric field produced by a charge

Which of the following stars has the highest surface temperature? A. red star B. blue star c. yellow star D. orange star

A 2kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this speed and in this direction

Suppose that, while lying on a beach near the equator of a far-off planet watching the sun set over a calm ocean, you start a stopwatch just as the top of the sun disappears. you then stand, elevating your eyes by a height h = 1.

Suppose you want to know if the color of peoples hair affects how warm it can keep their heads. describe the skills you would use to conduct an experiment to test your inquiry

The mass is increased by a factor of four. What is true about the period? Choose the best answer. The period remains unchanged. The period increases by a factor of four. The period is halved. The period doubles.

What does law of conservation of mass mean?

Why do substances with free electrons make the best conductors.