The quark epoch is when ________ was/were created
A) all known matter
B) everything in normal atoms
C) only dark energy
D) protons and neutrons that still survive
E) the rapid inflation of the cosmos
D
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Mesons are composed of
A. any odd number of quarks. B. three quarks of matching color. C. three quarks of three different colors. D. a colorless quark-antiquark pair.
The International Space Station is orbiting at an altitude of about 370 km above the earth's surface. The mass of the earth is 5.97 × 1024 kg, the radius of the earth is 6.38 × 106 m, and G = 6.67 × 10-11 N • m2/kg2
Assuming a circular orbit, (a) what is the period of the International Space Station's orbit? (b) what is the speed of the International Space Station in its orbit?
A circular loop carrying a current of 1.6 A is oriented in a magnetic field of 0.30 T. The loop has an area of 0.14 m2 and is mounted on an axis, perpendicular to the magnetic field, which allows the loop to rotate. What is the torque on the loop when its plane is oriented at a 21° angle to the field?
a. 2.4E–2 N?m b. 6.3E–2 N?m c. 3.7E–2 N?m d. 5.6E–2 N?m e. 9.4E–1 N?m
The distance between the object and the eyepiece of a compound microscope is 25.0 cm. The focal length of its objective lens is 0.200 cm and the eyepiece has a focal length of 2.60 cm. A person with a near point 25 cm is using the microscope
(a) What is the largest angular magnification obtainable using the eyepiece alone as a magnifying lens? (b) What is the total magnification of the microscope when used by the person of normal eyesight?