Which of the following statements about electrons is not true?
A) Electrons orbit the nucleus rather like planets orbiting the Sun.
B) Within an atom, an electron can have only particular energies.
C) An electron has a negative electrical charge.
D) Electrons have little mass compared to protons or neutrons.
E) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels.
A) Electrons orbit the nucleus rather like planets orbiting the Sun.
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Which planet search technique is currently best suited to finding Earth-like planets?
A) transit B) gravitational lensing C) Doppler D) astrometric E) combining all the above
What kind of a gas cloud can collapse and form stars?
A.) A very hot gas cloud that has a huge internal pressure can collapse and form stars. B.) A gas cloud that has a mass less than 10 solar masses can collapse and form stars. C.) The gas cloud must have a mass that exceeds the Jeans mass so that gravity overcomes the internal pressure in the cloud. D.) The gas cloud must have a mass that is smaller than the Jeans mass so that gravity overcomes the internal pressure in the cloud. E.) A black hole can collapse and form stars.
An object is rotating with an angular momentum 4.00 kg ? m2/s while being acted on by a constant torque 3.00 N ? m . What is the angular speed of precession of the angular velocity of the object?
A) 1.33 rad/s B) 0.750 rad/s C) 12.0 rad/s D) zero E) It depends on the moment of inertia of the object.
A 50.0-N box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at one instant the box is sliding to the right at 1.75 m/s and that it stops in 2.25 s with uniform acceleration
What magnitude force does friction exert on this box? A) 3.97 N B) 8.93 N C) 38.9 N D) 50.0 N E) 490 N