A 3.0 cm section of a horizontal wire carrying a 6.7 A current from east to west is place in a north to south 0.42 T magnetic field in the lab. In what direction is the magnetic force on the 3.0 cm section?
A. north
B. south
C. up
D. down
E. southwest
C. up
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The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 ?T. What is the magnetic field at a distance of 4 cm from this wire?
A) 6 ?T B) 2 ?T C) 4 ?T D) 10 ?T E) 8 ?T
A 20.0 kg box slides up a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 150 N is applied to the box to pull it up the incline. The applied force makes an angle of 0.00 degrees to the incline. If the incline has a coefficient of kinetic friction of 0.100, then the increase in the kinetic energy of the box is
A. 330 J. B. 390 J. C. 420 J. D. 481 J. E. 597 J.
In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 10^4 N/m and the pressure on the bottom surface is 9.0 × 10^4 N/m2 . If the area of the top and bottom surfaces of each wing is 2.0 m2, what is the total lift on the model airplane?
a. 2.0 × 10^3 N b. 8.0 × 10^3 N c. 1.6 × 10^4 N d. 3.6 × 10^4 N e. 1.0 × 10^3 N
It is the formation of iron in an evolved giant's core that triggers a Type II supernova event
Indicate whether the statement is true or false