A spring with a spring constant of 8.0 N/m is compressed to 20 cm. If the spring is uncompressed initially, then the work done is
A. 0.12 J.
B. 0.16 J.
C. 0.19 J.
D. 0.22 J.
E. 0.26 J.
B. 0.16 J.
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A steel ball bearing of mass m1 and speed of magnitude v1 has a head-on elastic collision with a steel ball bearing of mass m2 at rest. Rank the speed v1 of m1 relative to v2, the magnitude of the speed of m2, after the collision when i) m1>m2; ii) m1 = m2; and iii) m1
A. v1v2; v1>v2
The graph below shows a plot of angular acceleration in rad/s2 versus time from t = 0 s to t = 8 s. The change in angular velocity, ??, during this 8-second period is
A.
, CW.B.
, CCW.C.
, CW.D.
, CCW.E.
, CW.Mary passes Mike from behind while bicycling. As she passes him,
A) the two have different speeds and different velocities. B) the two have the same speeds and the same velocities. C) Mike turns into a hippopotamus. D) the two have the same speeds but different velocities. E) the two have different speeds but the same velocities.
What inductance must be put in series with a 200-? resistor at 4.00 kHz to have a total impedance of 240 ??
A) 12 mH B) 6.28 mH C) 3.28 mH D) 4.28 mH E) 5.28 mH