Let's say that hydrogen gas in a vessel is at equilibrium. That is, the temperature and the pressure of the gas are constant throughout the volume. What can be stated about all of the molecules within the gas?
1.They all have the same kinetic energy.
2.They all have the same speed.
3.They all have the same velocity.
4.None of these statements apply.
4
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The Doppler Effect is the apparent change in:
a) Speed b) Light c) Sound d) Frequency
Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
a. 51 ?T b. 33 ?T c. 72 ?T d. 64 ?T e. 46 ?T
A planet is orbiting a star. Which of the following statements is true for the acceleration and gravitational forces experienced by the star and the planet?
A) The acceleration of the planet is much more than the acceleration of the star, but the force on the star is the same but opposite the force on the planet. B) The acceleration of the planet is much more than the acceleration of the star, and the force on the planet is much more than the force on the star. C) The force on the star is much smaller than the force on the planet, but the accelerations are about equal.
A real image of a candle formed with a converging lens can be viewed on a screen placed
A. at either focal point of the lens. B. at a single position determined by the distance of the object and the construction of the lens. C. anywhere on the side of the lens from which the light emerges. D. nowhere; that is, it can't be viewed on a screen at all.