Equal currents of magnitude I travel into the page in wire M and out of the page in wire N. Eight directions are indicated by letters A through H
The direction of the magnetic field at point P is
a.
C.
b.
E.
c.
F.
d.
G.
e.
H.
d
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A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s with negligible friction and air resistance. What is the average power delivered by the engine? (1 hp = 746 W)
A) 50 hp B) 60 hp C) 70 hp D) 80 hp E) 90 hp
Compared to a giant iceberg, a hot cup of coffee has
A) more thermal energy at higher temperature. B) less thermal energy at higher temperature. C) about the same thermal energy but at a higher temperature. D) none 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.
Which of the following polyatomic ions has a doubly negative charge?
a. Acetate b. Sulfate c. Phosphate d. Ammonium