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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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?
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
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 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.