A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T magnetic field. Find the magnitude of the magnetic force on a 0.50-m length of the wire
A) 0.75 N
B) 1.5 N
C) 3.0 N
D) 6.0 N
A
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A long straight wire is carrying a current of 2.4 A in a region where the magnetic field is perpendicular to the wire. If the magnetic field is 0.52 mT, what is the magnitude of the force on 3.0 m of the wire?
A. 
B. 
C. 
D. 3.7 N
E. 7.2 N
In general, as stars go through the last stage of post-main sequence evolution they will lose mass in the process of settling down into their final state. Explain the mass-loss process and the final state of the star for a low mass star
What will be an ideal response?
James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. Compare the time it takes each to reach the lake below
A) James reaches the surface of the lake first. B) John reaches the surface of the lake first. C) James and John will reach the surface of the lake at the same time. D) Cannot be determined without knowing the mass of both James and John. E) Cannot be determined without knowing the weight of both James and John.
The speed of a 10-kHz sound wave in seawater is approximately 1 500 m/s. What is its wavelength in sea water?
a. 5.0 cm b. 10 cm c. 15 cm d. 20 cm e. 29 cm