The moons of Mars, Phobos (Fear) and Deimos (Terror), are very close to the planet compared to Earth's Moon. Their orbital radii are 9,378 km and 23,459 km respectively
What is the ratio of the orbital speed of Phobos to that of Deimos?
A) 1.582 B) 0.2528 C) 3.956 D) 2.858 E) 0.3998
A
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The magnetic field at a point P, a certain distance from a long wire carrying a current of 2.0 A, is 1.2 × 10-6 T. How far is P from the center of the wire?
A) 11 cm B) 22 cm C) 33 cm D) 44 cm E) 55 cm
Why do white-dwarf supernovae all have the same maximum luminosity?
What will be an ideal response?
A 0.20-km wide river has a uniform flow speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. In what direction must the boat be pointed in order to accomplish this?
a. 23° west of north b. 20° west of north c. 24° west of north d. 22° west of north e. 17° west of north
A simple circuit has a total resistance of 30 ?. If a 2.0-A current is maintained in this circuit, how much energy is dissipated in this circuit in 4.0 seconds?
A) 24 J B) 4.8 J C) 48 J D) 480 J E) 6.0 J