Determine the energy stored in the 60-?F capacitor.
A. 2.4 mJ
B. 3.0 mJ
C. 3.6 mJ
D. 4.3 mJ
E. 6.0 mJ
Answer: B
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A 50.0-kg box is being pulled along a horizontal surface by means of a rope that exerts a force of 250 N at an angle of 32.0° above the horizontal. The coefficient of kinetic friction between the box and the surface is 0.350
What is the acceleration of the box? A) 0.638 m/s2 B) 1.74 m/s2 C) 3.16 m/s2 D) 6.31 m/s2 E) 8.53 m/s2
A potential energy function for system 1 is given by U1(x) = Cx2 + Bx3. The potential energy function for system 2 is given by U2(x) = A + Cx2 + Bx3, where A is a positive quantity
How does the force on system 1 relate to the force on system 2 at a given position? A) The force on the two systems will be in opposite directions. B) The force is identical on the two systems. C) The force on the second system will be with less than the force on the first system. D) There is no relationship between the forces on the two systems. E) The force on the second system will be with greater than the force on the first system.
A horizontal 3-mm-thick flat copper plate, 1-m-long and 0.5-m-wide, is exposed in air at 27°C to radiation from the sun. If the total rate of solar radiation absorbed is 300 W and the combined radiative and convective heat transfer coefficients on the upper and lower surfaces are 20 and 15 W/(m2 K), respectively, determine the equilibrium temperature of the plate.
GIVEN
FIND
- The equilibrium temperature of the plate (Tp)
ASSUMPTIONS
- Steady state prevails
- The temperature of the plate is uniform
SKETCH
Which of the following is considered by scientists to be physically "real," but yet is not made of atoms or of other material particles such as protons, electrons, etc.?
A) the air B) neutron stars C) electromagnetic fields D) the ether E) Nonsense--we have known since Democritus that everything is made only of atoms and empty space.