What are the circumstances under which convection can occur in a substance?
A) when the substance is subjected to a strong magnetic field
B) when the substance is strongly cooled from underneath
C) when dense material is being added to the substance
D) when the substance is strongly shaken or disturbed by a strong wind
E) when the substance is strongly heated from underneath
E
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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?
Due to the presence of ice crystals in nearly frozen liquid water, the density of water is
A) lower. B) unaffected. C) higher.
In an AC series circuit the capacitive reactance is 253 W and frequency is 100 Hz. What is the capacitance?
a. 6.29 mF c. 50.0 mF b. 8.0 mF d. 3.2 mF
The first mate of a pirate ship shoots the noonday Sun with a sextant and measures the altitude to be 50o to the south on December 21 . The time on the ship's clock is 4 P.M. (GMT). What are the longitude and latitude of the ship?