A 25-g string is stretched with a tension of 43 N between two fixed points 12 m apart. What is the frequency of the second harmonic?
A) 18 Hz B) 24 Hz C) 36 Hz D) 12 Hz E) 6.0 Hz
D
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Two parallel and coaxial current loops of radius a are placed a distance 2L apart. When you look along the axis at the loops, the current in one is clockwise, and counterclockwise in the other. At a point on the axis half way between the loops the magnetic field in T has magnitude
A.
B.
.C.
.D.
.E.
.A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?
a. 42 kN b. 39 kN c. 45 kN d. 48 kN e. 35 kN
A fifteen turn rectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 A flowing through it. Two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 T,
the other two sides being perpendicular to the magnetic field. (a) The torque on the loop is (b) The magnetic moment of this coil is
Planetary geologists now refer to the exterior of the newborn moon as__________
A) a multiringed basin B) a micrometeorite C) a magma ocean D) coronae