When did Ptolemy live?
A) about 5000 years ago
B) about 100 years ago
C) about 1000 years ago
D) about 2000 years ago
E) about 500 years ago
D
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The density of a ___________ is greater than the density of a ___________
a. white dwarf, neutron star b. neutron star, black hole c. pulsar, neutron star d. pulsar, white dwarf e. white dwarf, black hole
Which of the following temperature scales has the smallest unit interval?
a. Celsius b. Kelvin c. Fahrenheit d. None of these
Magnetic Moment: A flat coil containing 25 identical loops carries 6.4 A of current. When it is placed in a uniform magnetic field of 0.22 T that is oriented parallel to the plane of the coil, the magnetic torque on it is 3.7 N ? m.(a) What is the magnetic moment of the coil?(b) What is the area of each loop?
What will be an ideal response?
A 5-g coin is dropped from a 300-m building. If it reaches a terminal velocity of 45 m/s, and the rest of the energy is converted to heating the coin, what is the change in temperature (in °C) of the coin? (The specific heat of copper is 387 J/kg/°C.)
a. 9 b. 2 c. 5 d. 21 e. 0.5