A proton with velocity 2.0 × 105 m/s enters a region where a uniform magnetic field of 0.30 T is present. The proton's velocity makes an angle of 60° with the magnetic field
What is the pitch of the helical path followed by the proton? (The "pitch" is the distance traveled parallel to the magnetic field while making one complete revolution around a magnetic field line.) A) 0.022 m
B) 0.140 m
C) 0.077 m
D) 0.250 m
E) 0.055 m
A
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What key event marks the transition of a protostar into a true (main-sequence) star?
A) the onset of sustained nuclear fusion in its core B) the clearing of the gas from the surrounding gas cloud into interstellar space C) the moment when the luminosity first matches the luminosity of the lowest-mass main sequence stars D) the onset of a strong stellar wind
The fundamental particles that are the building blocks of hadrons are
a. leptons. b. baryons. c. mesons. d. intermediate (or gauge) bosons. e. quarks.
Let's say that you have one mole of hydrogen gas, one mole of helium gas, and one mole of oxygen gas. Which of these quantities of gas has the greater mass?
1.The hydrogen gas. 2.The helium gas. 3.The oxygen gas. 4.They all have the same mass.
Matthew pulls his little sister Sarah along the horizontal ground in a wagon. He exerts a force on the wagon of 60.0 N at an angle of 37.0° above the horizontal. If he pulls her a distance of 12.0 m, how much work does Matthew do?
A) 185 J B) 433 J C) 575 J D) 720 J