Two long parallel wires that are 0.40 m apart carry currents of 10 A in opposite directions
What is the magnetic field strength in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (?0 = 4? × 10-7 T ? m/A)
A) 3.3 µT B) 67 µT C) 33 µT D) 6.7 µT
D
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An airplane flying horizontally at a speed of 50.0 m/s and an elevation of 160 m drops a package. Two seconds later it drops a second package. How far apart will the two packages land?
A. 100 m B. 162 m C. 183 m D. 269 m
A 20-m long steel wire (cross-section 1.0 cm2, Young's modulus 2.0 × 10^11 N/m2), is subjected to a load of 25 000 N. How much will the wire stretch under the load?
a. 0.25 cm b. 2.5 cm c. 12.5 cm d. 25 cm e. 1.25 cm
How "slow" must a 200-g ball move to have a de Broglie wavelength of 1.0 mm? (h = 6.626 × 10-34 J ? s)
What will be an ideal response?
An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 10^6 m, R = 5.0 × 10^6 m, and M = 4.0 × 10^24 kg
a. 7.8 km/s b. 3.5 km/s c. 5.4 km/s d. 6.9 km/s e. 4.8 km/s