Two of your classmates, each 82 kg, are separated by 4 meters. The gravitational force of attraction between them in nano-newtons is
a. 1.4 nN
b. 0.3 nN
c. 0.0 nN
d. 41.2 nN
e. 28.0 nN
e
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A long straight wire is parallel to one edge and is in the plane of a single-turn rectangular loop as shown. If the loop is moving in the plane shown so that the distance x changes at a constant rate of 20 cm/s, what is the magnitude of the emf induced in the loop at the instant x = 5.0 cm? Let I = 50 A, a = 50 cm, b = 6.0 cm
a.
11 ?V
b.
22 ?V
c.
27 ?V
d.
16 ?V
e.
34 ?V
Which of the following is not one of the three main categories of observation generally used by astronomers?
A) filtering to look at just a single color from an object B) time monitoring to track how an object's brightness varies with time C) spectroscopy to spread an object's light into a spectrum D) imaging to get a picture of an astronomical objects
Based on discoveries to date, which of the following conclusions is justified?
A) Planetary systems are common and planets similar in size to Earth are also common. B) Although planetary systems are common, few resemble ours with terrestrial planets near the Sun and jovian planets far from the Sun. C) Planets are common, but planets as small as Earth are extremely rare. D) Most stars have one or more terrestrial planets orbiting within their habitable zones.
The centers of two circular loops are separated by a fixed distance. For what relative orientation is their mutual inductance a minimum?
1.coaxial and lying in parallel planes 2.lying in the same plane 3.lying in perpendicular planes, with the center of one on the axis of the other 4.The orientation makes no difference.