Decreasing the volume of the container holding an ideal gas:
a. decreases the gas pressure by slowing the gas particles.
b. does not affect the gas pressure.
c. increases the gas pressure by slowing the gas particles.
d. increases the gas pressure because gas particles bounce off the walls of the container more often.
e. increases the gas pressure because gas particles strike the walls of the container with more momentum on average.
d
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The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
A) The star is not rotating. B) This is an example of the photoelectric effect. C) This is an example of the Doppler effect. D) The star has a radial velocity towards us. E) The second law of Kirchhoff explains this.
A projectile is fired from ground level with an initial speed of 55.6 m/s at an angle of 41.2° above the horizontal
(a) Determine the time necessary for the projectile to reach its maximum height. (b) Determine the maximum height reached by the projectile. (c) Determine the horizontal and vertical components of the velocity vector at the maximum height. (d) Determine the horizontal and vertical components of the acceleration vector at the maximum height.
An interpretation of the photoelectric effect is that:
1.Light is emitted only when electrons change orbits. 2.Light has a wavelike character. 3.Light is absorbed in quanta of energy E = h? 4.Electrons have an associated wave having wavelength ? = h/p. 5.Photons must have some minimum energy to penetrate a material. 6.More than one of the above
Complete the following sentence: "The moment of inertia of an object
1.depends on the rotational speed of the object." 2.will be greater for a larger-massed object than for a smaller-massed object." 3.is not a function of the object's mass." 4.is a function of the axis about which the object is spun."