The shear velocity in the 60-mm-diameter horizontal water pipe of Problem 2 is nearest:
(A) 0.031 m/s
(B) 0.024 m/s
(C) 0.019 m/s
(D) 0.017 m/s
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A horizontal force is applied to a 2.0 kg box. The box starts from rest, moves a horizontal distance of 12.0 meters, and obtains a velocity of 8.0 m/s. The change in the kinetic energy is
A. 32 J. B. 48 J. C. 50 J. D. 58 J. E. 64 J.
A small lead sphere of mass m is hung from a spring of spring constant k. The gravitational potential energy of the system equals zero at the equilibrium position of the spring before the weight is attached. The total mechanical energy of the system when the mass is hanging at rest is
A.
B.
kx2.C.
D.
kx2.E.
Energy Levels: What frequency must a photon have to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 3.06 × 1014 Hz B. 6.16 × 1014 Hz C. 4.11 × 1014 Hz D. 5.20 × 1014 Hz E. 9.24 × 1014 Hz
A radioactive substance with a half-life of 3.0 days has an initial activity of 2400 Bq. What is its activity after 6.0 days?
A) 1200 Bq B) 1800 Bq C) 600 Bq D) 300 Bq E) 150 Bq