A positively charged electron is
A) called a positron.
B) called a muon.
C) called a proton.
D) not found in nature.
E) called a pion.
A
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The brightest stars in aging globular clusters will be:
A) core stars of planetary nebulae. B) massive blue main sequence stars like Spica. C) blue stragglers. D) red supergiants like Betelguese and Antares. E) blue supergiants like Rigel and Deneb.
A 7.5-kg otter slides down a hill, starting from rest at the top. The sloping surface of the hill is 8.8 m long,
and the top is 6.5 m above the base. If the speed of the otter at the bottom of the hill is 9.2 m/s, how much energy of the otter-Earth system was converted to internal energy?
A helium nucleus (charge = 2e, mass = 6.63 × 10^-27 kg) traveling at 6.20 × 10^5 m/s enters an electric field, traveling from point A, at a potential of 1.50 × 10^3 V, to point B, at 4.00 × 10^3 V. What is its speed at point B?
1.7.91 × 10^5 m/s 2.3.78 × 10^5 m/s 3.2.13 × 10^5 m/s 4.2.52 × 10^6 m/s 5.3.01 × 10^8 m/s
A person pushes on a doorknob with a force of 5.00 N perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the hinges of the door. The door begins to rotate with an angular acceleration of 2.00 rad/s2
What is the moment of inertia of the door about the hinges? A) 2.00 kg?m2 B) 1.00 kg?m2 C) 12.5 kg?m2 D) 8.00 kg?m2 E) 6.40 kg?m2