A car is traveling with a constant speed when the driver suddenly applies the brakes, giving the car a deceleration of 3.50 m/s2. If the car comes to a stop in a distance of 30.0 m, what was the car's original speed?
A)
10.2 m/s
B)
14.5 m/s
C)
105 m/s
D)
210 m/s
E)
315 m/s
B
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Two point charges of +1.0 ?C and -2.0 ?C are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) -36 mJ B) +18 mJ C) 0 mJ D) +36 mJ E) -18 mJ
An anelastic material can be modeled with a
(a) Dashpot (b) Maxwell solid (c) Voigt solid (d) Four-element solid
A pendulum with a bob of mass 150 g has the same period as a thin rod (not massless) of the same mass and length 17 cm when the rod is pivoted about its end. What is the length of the pendulum?
A. 12 cm B. 15 cm C. 22 cm D. 27 cm
A 1700 kg car travels at 20 m/s WEST and collides with a 2000 kg car traveling EAST. The collision is completely inelastic and they both come to rest. What is the velocity of the 2000 kg car?
A. 17 m/s EAST B. 14 m/s EAST C. 17 m/s WEST D. 14 m/s WEST E. 12 m/s EAST