Consider the motion of a 1.00 kg particle that moves with potential energy given by U(x) = -(2.0 J?m)/x + (4.0 J?m2)/x2. Suppose the particle is moving with a speed of 30.0 cm/s when it is located at x = 3.00 m
What is the position with the greatest value of x at which the particle comes to rest? A)
6.73 m
B)
5.48 m
C)
8.69 m
D)
9.21 m
E)
7.29 m
C
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Matter Waves: Electrons are accelerated to a speed of 4.0 × 104 m/s and are then aimed at a double-slit apparatus, where interference fringes are detected. If the electrons were replaced by neutrons, what speed must neutrons have to produce interference fringes with the same fringe spacing as that observed with the electrons? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, mneutron = 1.675 × 10-27 kg)
A. 2.2 × 101 m/s B. 7.3 × 107 m/s C. 1.7 × 106 m/s D. 9.3 × 102 m/s
During a lightning strike you don't want to be inside a building framed with
A) steel. B) iron. C) aluminum. D) wood.
The electric field between oppositely-charged parallel plates is
A) uniform. B) stronger at the ends. C) composed of field lines curved in opposite directions. D) none of the above
A current-carrying 2.0-cm long segment of wire is inside a long solenoid (radius = 4.0 cm, n = 800 turns/m, current = 50 mA). The wire segment is oriented perpendicularly to the axis of the solenoid. If the current in the wire segment is 12 A, what is the magnitude of the magnetic force on this segment?
a. 22 ?N b. 16 ?N c. 18 ?N d. 12 ?N e. 0 ?N