A potential energy function for a certain system is given by U1(x) = Cx2 + Bx3. The potential energy function for a second system is given by U2(x) = A + Cx2 + Bx3, where A is a positive quantity
If an object begins at the same initial position with the same initial velocity in both systems, how is the motion in the two systems related? A)
The motion in the first system will be with greater speed than in the second system because of the lower potential energy.
B)
The motion in the second system will be at greater speeds in one direction and lower speeds in the other direction relative to the first system.
C)
The motion in the two systems is identical.
D)
The motion in the second system will be with greater speed than in the first system because of the greater potential energy.
E)
The motion in the two systems will be in opposite directions.
C
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Determine the change in length of a 20-m railroad track made of steel if the temperature is changed from ?15°C to +35°C. (?STEEL = 1.1 × 10^?5/°C)
An L-shaped beam is loaded as shown in the figure. The bending moment at the midpoint of span AB is approximately:
(A) 6.8 kN?m
(B) 10.1 kN?m
(C) 12.3 kN?m
(D) 15.5 kN?m
A boulder is dropped onto mud and plows into it a certain distance. If it hits with three times as much speed, the distance it plows into the mud will likely be
A) the same distance. B) twice as deep. C) three times as deep. D) more than three times as deep.
Two objects, A and B, are placed in thermal contact. The entropy of object A decreases. What can be said about the relationship between the temperatures of the two objects?
a. TA < TB b. TA > TB c. TA = TB d. not enough information to say