Which diagram correctly shows the magnetic field lines created by a circular current loop in which current flows in the direction shown?
A.
B.
C.
D.
E.
Answer: C
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How is quantum tunneling important to our existence here on Earth?
A) It plays a crucial role in nuclear fusion in the Sun, so that our Sun would not shine brightly without it. B) It explains how neutron stars are able to stay stable rather than collapsing under their strong gravity. C) It explains why electrons in atoms gradually fill different energy levels, thus making chemistry possible. D) It is important to understanding the law of conservation of energy.
A solid lead sphere of radius 10 m (about 66 ft across!) has a mass of about 57 million kg. If two of these spheres are floating in deep space with their centers 20 m apart, the gravitational attraction between the spheres is only 540 N (about 120 lb). How large would this gravitational force be if the distance between the centers of the two spheres were tripled?
A. 60 N B. 180 N C. 1620 N D. 4860 N
A jumbo jet of mass 100,000 kg during takeoff experience a thrust for each of its four engines of 50,000 N, producing an acceleration of
A) 0.5 m/s2. B) 1 m/s2. C) 2 m/s2. D) 4 m/s2. E) none of the above
A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m
The ball makes 2.0 revolutions every 1.0 s. (a) What are the magnitude and direction of the acceleration of the ball? (b) Find the tension in the string.