Which of the following magnetic materials has domains?
A. paramagnetic
B. diamagnetic
C. solenoidic
D. amperic
E. ferromagnetic
E. ferromagnetic
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A meteoroid, heading straight for Earth, has a speed of 14.8 km/s relative to the center of Earth as it crosses our moon's orbit, a distance of 3.84 × 108 m from the earth's center
What is the meteroid's speed as it hits the earth? You can neglect the effects of the moon, Earth's atmosphere, and any motion of the earth. (G = 6.67 × 10-11 N • m2/kg2, Mearth = 5.97 × 1024 kg) A) 18.5 km/s B) 21.5 km/s C) 32.4 km/s D) 87.3 km/s
Volcanism is more likely on a planet that
A) is closer to the Sun. B) is struck often by meteors and solar system debris. C) has high internal temperature. D) doesn't have an atmosphere or oceans.
An aluminum cantilever beam of length L 5 0.65 m carries a distributed load, which includes its own weight, of intensity q/2 at A and q at B. The beam cross section has a width of 50 mm and height of 170 mm. Allowable bending stress is 95 MPa and allowable shear stress is 12 MPa. The permissible value of load intensity q is approximately:
(A) 110 kN/m
(B) 122 kN/m
(C) 130 kN/m
(D) 139 kN/m
Ray says that interference effects cannot be observed with visible light because random phase changes occur in time intervals less than a nanosecond. Stacy says that doesn't matter if collimated light from a single source reaches multiple openings. (They are arguing about a light source 50.0 cm away from two 0.010 0 mm-wide slits, 2.00 mm apart, with a screen 1.00 m away from the slits.) Which
one, if either, is correct, and why? a. Ray, because the phases at the two slits will be random and different. b. Ray, because it takes light over 3 ns to travel 1.00 m to the screen. c. Stacy, because the difference in time of travel from the source to the slits is no more than about 7 × 10^-12 s. d. Stacy, but only if a lens is placed in front of the slits. e. Both, because interference of light never occurs outside a physics lab.