Because of the equivalence of mass and energy, an electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass
a. True
b. False
Indicate whether the statement is true or false
True
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If the net work done on an object is negative, then the object's kinetic energy
A) decreases. B) remains the same. C) increases. D) is zero. E) cannot be determined without knowing the object's mass.
Particle A (mass = m, charge = Q) and B (mass = m, charge = 5 Q) are released from rest with the distance between them equal to 1.0 m. If Q = 12 mC, what is the kinetic energy of particle B at the instant when the particles are 3.0 m apart?
a. 8.6 J b. 3.8 J c. 6.0 J d. 2.2 J e. 4.3 J
Neutral hydrogen can be detected because its electron occasionally ________ its spin and creates the 21-cm emission line for radio observers
Fill in the blank(s) with correct word
A system has a heat source supplying heat to an ideal gas at a rate of 187.0 W and the gas is doing work at a rate of 130.9 W. At what rate is the internal (thermal) energy of the gas changing?
A) 56.1 W B) 318 W C) -56.1 W D) 187 W