A 1000-kg car is traveling north at 20.0 m/s. A 1500-kg car is traveling north at 36.0 m/s. The 1500-kg collides with the rear of the 1000-kg car and they lock together
Ignoring external forces acting during the collision, what is the velocity of the cars immediately after the collision? A)
56.0 m/s north
B)
29.6 m/s north
C)
13.6 m/s south
D)
8.00 m/s south
E)
28.0 m/s north
B
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Observer A is 3.0 m from a tiny light bulb and observer B is 12.0 m from the same bulb. Assume that the light spreads out uniformly and undergoes no significant reflections or absorption
If observer B sees a light of intensity I, the light intensity that A sees is A) I. B) 9I. C) 16I. D) 36I. E) 144I.
The Mohorovicic discontinuity marks the change in rock density elasticity between the
A) inner and outer core. B) core and the mantle. C) mantle and the crustal surface. D) asthenosphere and lithosphere.
Capacitors in Combination: A system of four capacitors is connected across a 90-V voltage source as shown in the figure. What is the equivalent capacitance of this system?
A. 1.5 ?F B. 15 ?F C. 3.6 ?F D. 3.3 ?F
The superposition of two waves E1 = E0 sin(?t) and E2 = E0 sin(?t + ?) arriving at the same point in space at the same time is E =
A.
.B.
C.
.D.
.E.
.