When you double the number of windings in an ideal solenoid while keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will
A) quadruple.
B) double.
C) triple.
D) be reduced by a factor of one-fourth.
E) be reduced by a factor of one-half.
B
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In a metal alloy manufacturing and heat treatment plant and in its immersion quenching process, steel plates are first heated in a furnace and then quenched (or cooled) in a coolant bath to obtain the desired steel properties and surface hardness. In one such process a flat stainless steel plate 0.6-cm-thick, 7.5-cm-wide and 0.3-m-long is immersed horizontally at an initial temperature of 980°C in a large water bath at 100°C and at atmospheric pressure. Determine how long it will take this plate to cool to 540°C.
GIVEN
? A flat stainless steel plate is immersed horizontally in water
? Plate thickness (s) = 0.6 cm = 0.006 m
? Plate width (w) = 7.5 cm = 0.075 m
? Plate length (L) = 0.3 m
? Initial plate temperature (Tpi) = 980°C = 1253 K
? Pressure = 1 atm
? Water bath temperature (Tb) = 100°C (saturation) = 373 K
FIND
? Time for plate to cool to Tpf = 540°C = 813 K
ASSUMPTIONS
? The heat fluxes from the bottom and top of the plate are equal
? The plate is polished
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water at the pool temperature of 100°C
From Appendix 2, Table 35, for steam at 100°C
From Table 9.2, The surface tension, o, for water @ 100°C = 0.0589 N/m
From Table 9.1, The coefficient, Csf, for water on mechanically polished stainless steel = 0.0132
From Table 11.3, the emissivity of polished stainless steel at the average temperature of
(980°C + 540°C)/2 = 760°C (g) = 0.22
A force of 451 N is applied to 111 kg box that has a coefficient of static friction of 0.450. What is the force of friction on the box?
A. 490 N B. 0.00 N C. 108 N D. 451 N E. 203 N
A 0.50-kg object is attached to an ideal spring of spring constant 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position
What are (a) the total energy and (b) the amplitude of vibration of the system?
An object moves in a direction parallel to its length with a velocity that approaches the velocity of light. The length of this object, as measured by a stationary observer,
A) approaches infinity. B) approaches zero. C) increases slightly. D) decreases slightly. E) does not change.