A circus diver drops from a high pole into water far below. When he is halfway down
A) his potential energy is halved.
B) he has gained an amount of kinetic energy equal to half his initial potential energy.
C) his kinetic energy and potential energy are equal.
D) all of the above
E) none of the above
Answer: D
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Conservation of charge means that
a. The total amount of charge in the universe is constant. b. No experimenter has ever seen a single charge destroyed by itself. c. Electrons by themselves can be neither created nor destroyed. d. Charge can be neither created nor destroyed. e. All of the above.
A 110-V hair dryer is rated at 1200 W. What current will it draw?
A) 0.090 A B) 1.0 A C) 5.0 A D) 11 A E) 12 A
A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of 30°
A) zero B) 3.1 × 10-3 T?m2 C) 5.5 × 10-3 T?m2 D) 6.3 × 10-3 T?m2 E) 9.2 × 10-3 T?m2
A part for a land-based gas-turbine made of Haynes 25 must carry a tensile stress of 140 MPa (20 ksi). For a design lifetime of 10 years, what is the allowable temperature for this part, based only upon high-temperature creep rupture?
What will be an ideal response?