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 alternative to nuclear fission reactors in a nuclear fusion reactor. Explain why it is much more difficult to get a fusion reactor to work. So far there are2 types of confinement systems used.

Two charged dust particles exert a force of 9.0 ✕ 10-2 n on each other. what will be the force if they are moved so they are only one-ninth as far apart?

Identify the statement that correctly represents how light travels. Light can travel in a vacuum, and the speed at which it travels decreases if the source is moving away.

A load of 5N gives an extension of 0.65cm in a wire which obeys the hookes law. what is the extension caused by the load of 20N

The frequency of sound will decrease when; A) The source approaches a stationary observer B) The observer approaches a stationary source C) The source recedes from a stationary observer D) The observer recedes from a stationary source E) Both A and

During a summer with little rainfall, your house on a hill slope experiences an interval during which your well runs dry. You have to borrow water from your neighbor who lives downslope from you. Why does your neighbor have water when you don't?

If a force does not act parallel to the resulting displacement, what is the effect on the work done by the force?

A stick is a connection of two same - diameter metal rod 5 cm, and a length of both stick is 0,6m. The thermal conductivity of the first rod 92 cal / s. m.°C, and the second stick 50 cal / s. m.°C.

you can produce a sound by plucking a string or by blowing in a pipe. how are these two ways different?

There are four springs stretched by the same mass. Spring A: 25 cm Spring B: 10 cm Spring C: 100 cm Spring D: 1 cm Which spring is the strongest? A B C D