An object is moving with constant non-zero velocity in the +x-axis. The velocity versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axis.
D) a parabolic curve.
E) a hyperbolic curve.
A
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Two solenoids are each made of 2 000 turns of copper wire per meter. Solenoid I is 2 m long, while solenoid II is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field BI along the axis of solenoid I to the magnetic field BII along the axis of solenoid II, BI/BII, is
a. 1/4. b. 1/2. c. 1. d. 2 e. 4.
Most of the elements heavier than helium were made during the first few minutes after the big bang
Indicate whether the statement is true or false
A magnetic field exists in a current-carrying coil of wire
A) if it contains a piece of iron. B) with or without a contained piece of iron. C) only if the current changes.
Equilibrium: A uniform 1200-N piece of medical apparatus that is 3.5 m long is suspended horizontally by two vertical wires at its ends. A small but dense 550-N weight is placed on the apparatus 2.0 m from one end, as shown in the figure. What are the tensions, A and B, in the two wires?
A. A = 880 N, B = 880 N B. A = 840 N, B = 910 N C. A = 9000 N, B = 8200 N D. A = 910 N, B = 840 N E. A = 8200 N, B = 9000 N