Self-Inductance: The inductance of a solenoid that is 16.0 cm long and has a cross-sectional area of 1.00 × 10-4 m2 is 1.00 mH. How many turns of wire does this solenoid have? (?0 = 4? × 10-7 T ? m/A)
A. 318,000
B. 159,000
C. 1130
D. 282
E. 150
Answer: C
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Conservation of Momentum: Consider two less-than-desirable options. In the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. In the second option you are driving 30 mph and crash head-on into a stationary brick wall. In neither case does your car bounce back from the thing it hits, and the collision time is the same in both cases. Which of these two situations would result in the greater impact force on your car?
A. hitting the other car B. hitting the brick wall C. The force would be the same in both cases. D. None of these choices are correct.
Which of the following statements does not use the term light-year in an appropriate way?
A) It's about 4 light-years from here to Alpha Centauri. B) It will take me light-years to complete this homework assignment. C) A light-year is about 10 trillion kilometers. D) It will take the Voyager spacecraft about 20,000 years to travel just 1 light-year. E) The Milky Way Galaxy is about 100,000 light-years in diameter.
Vector = 6.0 m and points 30° north of east. Vector = 4.0 m and points 30° south of west. The resultant vector + is given by
A) 2.0 m at an angle 30° north of east. B) 2.0 m at an angle 60° north of east. C) 10.0 m at an angle 60° east of north. D) 10.0 m at an angle 30° north of east. E) 10.0 m at an angle 60° north of east.
As an artillery shell travels from the gun to the target, the projectile's vertical speed changes, but its horizontal speed stays constant
a. True b. False Indicate whether the statement is true or false