The phenomenon of beats results from sound
A) refraction.
B) reflection.
C) interference.
D) all of the above
E) none of the above
Answer: C
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The escape velocity for a 100-kg object on Earth is about 11 km/s. What is the escape velocity of a 50-kg object on the surface of Earth?
A) 11 km/s B) 22 km/s C) 5.5 km/s D) 44 km/s E) 2.75 km/s
A plane has an eastward heading at a speed of 156 m/s (relative to the air). A 20.0 m/s wind is blowing southward while the plane is flying. The velocity of the plane relative to the ground is
A) 157 m/s at an angle 7.31° south of east. B) 157 m/s at an angle 7.31° east of south. C) 155 m/s at an angle 7.36° south of east. D) 155 m/s at an angle 7.36° east of south. E) 157 m/s at an angle 7.36° south of east.
The x-component of motion of an object is given by x(t) = Axcos(?xt + ?x) and the y-component of motion of the object is given by y(t) = Aycos(?yt + ?y)
What relationships between the A,?, and ? parameters must be true so that the motion of the object is on a circle? A) Ax = Ay, ?x = ?y, and ?x = ?y B) Ax = ±Ay, ?x = ±?y C) Ax = ±Ay, ?x = ?y, and ?x = ?y ± ?/2 D) Ax = Ay, ?x = ±?y, and ?x = ?y E) Ax = ±Ay, ?x = ±?y, and ?x = ?y ± ?/2
The magnetic field of a plane progressive electromagnetic wave in a vacuum is given by Bz = Bocos(ky - ?t). What is the corresponding expression for the electric field?
A) Ex = cBosin(ky - ?t) B) Ex = - cBocos(ky - ?t) C) Ez = cBosin(ky - ?t) D) Ex = cBocos(ky - ?t) E) Ex = - cBosin(ky - ?t)