A 50.0-N brick has the following measures: 30.0 cm × 10.0 cm × 4.00 cm. What is the maximum pressure it can exert on a horizontal surface due to its interaction with Earth?
A) 1.25 Pa
B) 12.5 Pa
C) 1.25 kPa
D) 12.5 kPa
D
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A long straight wire is parallel to one edge and is in the plane of a single-turn rectangular loop as shown. If the loop is changing width so that the distance x changes at a constant rate of 4.0 cm/s, what is the magnitude of the emf induced in the loop at an instant when x = 6.0 cm? Let a = 2.0 cm, b = 1.2 m, and I = 30 A
a.
5.3 ?V
b.
2.4 ?V
c.
4.8 ?V
d.
2.6 ?V
e.
1.3 ?V
Mass is transferred from a normal star in a close binary system toward a white dwarf. The material that is transferred to the white dwarf forms a rapidly growing whirlpool of material known around the white dwarf known as a(n)
a. accretion disk. b. Lagrangian point. c. Algol paradox. d. planetary nebula. e. supernova remnant.
Which of these is NOT typical of a condensing protostar?
A) magnetic fields producing polar flows B) dusty disks around their equators C) Herbig-Haro objects projecting a light year out in space D) fusion of helium into carbon in their cores E) more infrared than visible light given off from the cocoon of dust around the star
Suppose that a sound source is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be
A) unchanged. B) twice as great. C) half as great. D) one-fourth as great.