A long straight wire (diameter = 2.0 mm) carries a current of 25 A. What is the magnitude of the magnetic field 0.50 mm from the axis of the wire?
a. 5.0 mT
b. 10 mT
c. 0.63 mT
d. 2.5 mT
e. 0.01 mT
d
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The tensile strength (the maximum tensile stress it can support without breaking) for a certain steel wire is 3000 MN/m2. What is the maximum load that can be applied to a wire with a diameter of 3.0 mm made of this steel without breaking the wire?
A) 64 kN B) 9.0 kN C) 42 kN D) 85 kN E) 21 kN
How does metal content vary between young disk stars and older halo stars? Why?
What will be an ideal response?
A strobe photograph of a car moving along a straight road shows the interval between each successive image to be diminishing. If the direction of motion of the car is taken as positive, which of the following are negative?
a. the speed of the car c. the average acceleration of the car b. the average velocity of the car d. all of the above
Which of the following statements does not apply to the formation of gas giants like Jupiter, compared to terrestrial planets?
A) accreted from icy planetesimals B) formed in a region with lower orbital speeds C) surface dramatically altered during bombardment D) caused icy planetesimals to slingshot away from the Sun, to become Oort cloud comets E) formed in regions cold enough for water to freeze