An iron block of density ?Fe and of volume l3 is immersed in a fluid of density ?fluid. The block hangs from a scale which reads W as the weight. The top of the block is a height h below the surface of the fluid. The correct equation for the reading of the scale is
a. W = (?Fe ? ?fluid)ghl2.
b. W = (?fluid ? ?Fe)gl3.
c. W = (?Fe ? ?fluid)gl3.
d. W = (?Fe + ?fluid)ghl2.
e. W = (?Fe + ?fluid)gl3.
c
You might also like to view...
A current of 5 A is flowing in a 20 mH inductor. The energy stored in the magnetic field of this inductor is
A) 1 J. B) 0.25 J. C) 0.50 J. D) 0. E) dependent upon the resistance of the inductor.
The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80°. The resulting acceleration has a magnitude of 20 m/s2. What is the mass of the body?
A. 2.4 kg B. 2.2 kg C. 2.7 kg D. 3.1 kg E. 1.5 kg
Electric charge will flow in an electric circuit when
A) electric resistance is low. B) a potential difference exists. C) the circuit is grounded. D) electric devices in the circuit are not defective.
The planet Neptune is, on average, about 4.5 billion km from the sun. How long does it take light from the sun to reach Neptune? (Recall that the speed of light is about 300,000 km/s)
A) about 4 days B) about 4 hours C) about 4 seconds D) about 4 minutes