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Question
Spaceship A, traveling past us at 0.7c, sends a message capsule to spaceship B, which is in front of A and is traveling in the same direction as A at 0.8crelative to us. The capsule travels at 0.95crelative to us. A clock that measures the proper time between the sending and receiving of the capsule travels:A) in the same direction as the spaceships at 0.7crelative to us
B) in the opposite direction from the spaceships at 0.7crelative to us
C) in the same direction as the spaceships at 0.8crelative to us
D) in the same direction as the spaceships at 0.95crelative to us
E) in the opposite direction from the spaceships at 0.95crelative to us
Answer
This answer is hidden. It contains 1 characters.
Related questions
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The intensity of the microwave background radiation, a remnant of the big bang:
A) is greatest in directions toward the center of the galaxy
B) is least in directions toward the center of the galaxy
C) is proportional to the reciprocal of the distance from us
D) is proportional to the square of the distance from us
E) is nearly the same in all directions
Q:
The velocities of distant objects in the universe indicate that the time elapsed since the big bang is about:
A) 105y
B) 1010y
C) 1015y
D) 1020y
E) 1025y
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In terms of quark content a beta decay can be written:
Q:
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B) uud
C) udd
D) ddd
E) uds
Q:
The up quark u has charge +2e/3 and strangeness 0; the down quark d has charge -e/3 and strangeness 0; the strange quark s has charge -e/3 and strangeness -1. This means there can be no baryon with:A) charge 0 and strangeness 0B) charge -eand strangeness -1C) charge +eand strangeness -1D) charge +eand strangeness -2E) charge 0 and strangeness -2
Q:
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A) three quarks
B) two quarks and an antiquark
C) one quark and two antiquarks
D) one quark and one antiquark
E) two quarks
Q:
Any meson is a combination of:
A) three quarks
B) two quarks and an antiquark
C) one quark and two antiquarks
D) one quark and one antiquark
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Q:
Quarks are the constituents of:
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B) all leptons
C) all strongly interacting particles
D) only strange particles
E) only mesons
Q:
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B) have charge that is a multiple of e/3
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Q:
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B) electromagnetic and strong
C) electromagnetic and weak
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Q:
Strangeness is conserved in:
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B) no particle decays
C) all weak particle decays
D) all strong particle decays
E) some strong particle decays
Q:
When a kaon decays via the strong interaction the products must include a:
A) baryon
B) lepton
C) strange particle
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Q:
Two baryons interact to produce pions only, the original baryons disappearing. One of the baryons must have been:
A) a proton
B) an omega minus
C) a sigma
D) an antiparticle
E) none of these
Q:
A neutral lepton cannot decay into two neutrinos. Of the following conservation laws, which would be violated if it did?
A) Energy
B) Baryon number
C) Linear Momentum
D) Angular momentum
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Q:
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B) the strong and weak forces only
C) the electromagnetic and gravitational forces only
D) the electromagnetic, gravitational, and weak forces only
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Q:
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A) photon
B) pion
C) neutrino
D) kaon
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Q:
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Q:
The microwave background radiation is a result of the big bang. The big bang also resulted in a uniform distribution of background:
A) electrons
B) quarks
C) gluons
D) neutrinos
E) atoms
Q:
Compared to fusion in a tokamak, laser fusion makes use of:
A) smaller particle number densities
B) greater particle number densities
C) longer confinement times
D) higher temperatures
E) lower temperatures
Q:
For a controlled nuclear fusion reaction, one needs:
A) high number density nand high temperature T
B) high number density nand low temperatureT
C) low number density nand high temperature T
D) low number density nand low temperature T
E) high number density nand temperature T = 0 K
Q:
The first step of the proton-proton cycle is:
Q:
Nuclear fusion in the Sun is increasing its supply of:
A) hydrogen
B) helium
C) nucleons
D) positrons
E) neutrons
Q:
The purpose of a moderator in a nuclear reactor is to:
A) provide neutrons for the fission process
B) slow down fast neutrons to increase the probability of capture by uranium
C) absorb dangerous gamma radiation
D) shield the reactor operator from dangerous radiation
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Q:
In the normal operation of a nuclear reactor:
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B) control rods are adjusted so the reactor is critical
C) the moderating fluid is drained
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Q:
The energy supplied by a thermal neutron in a fission event is essentially its:
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B) binding energy
C) kinetic energy
D) rest energy
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Q:
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B) always identical
C) never 140Xe and 94Sr
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E) none of the above
Q:
A certain nucleus, after absorbing a neutron, emits a and then splits into two alpha particles. The (A, Z) of the original nucleus must have been:A) 6, 2B) 6, 3C) 7, 2D) 7, 3E) 8, 4
Q:
Radioactive polonium, 214Po (Z= 84), decays by alpha emission to:
A) 214Po (Z= 84)
B) 210Pb (Z= 82)
C) 214At (Z= 85)
D) 218Po (Z= 84)
E) 210Bi (Z= 83)
Q:
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Q:
Bombardment of 28Si (Z= 14) with alpha particles may produce:
A) a proton and 31P (Z= 15)
B) hydrogen and 32S (Z= 16)
C) a deuteron and 27Al (Z= 13)
D) helium and 31P (Z= 15)
E) 35Cl (Z= 17)