Which one of the following IS NOT a characteristic of terrestrial planets?
a. low average density
b. orbits inside the asteroids
c. craters in old surfaces
d. small diameters
e. very few satellites
A
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A circular coil (radius = 0.40 m) has 160 turns and is in a uniform magnetic field. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.16 N ? m when the current in the coil is 4.0 mA. What is the magnitude of the magnetic field?
A. 0.37 T B. 1.6 T C. 0.50 T D. 1.2 T E. 2.5 T
The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. The mass of a nickel atom is 9.75 × 10-26 kg
What is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 J ? s, h = 1.055 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 0.023 eV B) 0.019 eV C) 0.015 eV D) 0.031 eV E) 0.027 eV
A projectile is shot horizontally at 23.4 m/s from the roof of a building 55 m tall and experiences negligible air resistance
(a) Determine the time necessary for the projectile to reach the ground below. (b) Determine the distance from the base of the building that the projectile lands. (c) Determine the horizontal and vertical components of the velocity just before the projectile reaches the ground.
For fully turbulent flow in a long tube of diameter D, develop a relation between the ratio (L/?T)/D in terms of flow and heat transfer parameters, where L/?T is the tube length required to raise the bulk temperature of the fluid by ?T for fluids with Prandtl number of the order of unity or larger for liquid metals.
GIVEN
Fully developed turbulent flow in a long tube
Diameter = D
L/? T = Tube length required to raise the bulk temperature by ? T
FIND
A relationship for (L/?T)/D in terms of flow and heat transfer parameters using
(a) Equation 7.61 for fluids with Pr = 1
(b) liquid metals
ASSUMPTIONS
Steady state
Constant fluid properties
Uniform wall temperatures
SKETCH
