The planets never travel in a straight line as they orbit the Sun. According to Newton's second law of motion, this must mean that ________
A) the planets are always accelerating B) a force is acting on the planets
C) the planets will eventually fall into the Sun D) the planets have angular momentum
B
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An object is placed between C and F in front of a concave mirror with a focal length of 10 cm. What is the position of its image in relation to the mirror and what are its characteristics?
A) = 10 cm, real, smaller than object B) = 10 cm, virtual, smaller than object C) > 20 cm, real, larger than object D) = 20 cm, real, same size as the object E) = 20 cm, virtual, same size as the object
In an electromagnetic wave in free space, the field and fields are
A) parallel to one another and perpendicular to the direction of wave propagation. B) parallel to one another and parallel to the direction of wave propagation. C) perpendicular to one another and perpendicular to the direction of wave propagation. D) perpendicular to one another and parallel to the direction of wave propagation.
A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 W is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (at), where A = 80 mT and a = 50p rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
a. 11 mA b. 18 mA c. 14 mA d. 22 mA e. zero
All of the jovian planets rotate more rapidly than any of the terrestrial planets
Indicate whether the statement is true or false