By how much will a slab of concrete 18. m long contract when the temperature drops from 24.°C to -16.°C? (The coefficient of linear thermal expansion for concrete is 12 × 10-6 per degree C.)
A) 1.5 cm
B) 0.86 cm
C) 70. mm
D) 15. cm
E) 0.5 cm
B
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An ideal solenoid of radius a has n turns per unit length and current I. The magnetic flux ?B through any area completely inside the solenoid, centered on the solenoid axis but at a 45° angle to the axis so that it touches the inside of the solenoid as shown below, is
?
?
A.
.B.
.C.
D.
E.
A 90.% efficient transformer supplies 3.0 Amperes at 6.0 volts. If the input voltage is 120. v, what is the input current?
What will be an ideal response?
A loop of area 0.384 m2 is in a uniform 0.0565-T magnetic field. If the flux through the loop is 6.10 × 10^–3 T·m2, what angle does the normal to the plane of the loop make with the direction of the magnetic field?
a. 73.7° b. 89.3° c. 16.3° d. 76.0º e. This is not possible.
Quarks come in what flavors?
a. up, down and strange c. red, green and blue b. charm, top and bottom d. all of the above