A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The peak current in the circuit is
a. 0.963 A.
b. 10.3 A.
c. 11.0 A.
d. 11.9 A.
e. 29.2 A.
b
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A 4.0-?C charge is situated at the origin of an xy-coordinate system. What is the magnitude and direction of the electric potential at x = 6.0 m?
A) 1500 V along the +x-axis B) 4000 V along the +x-axis C) 4000 V with no direction, as it is a scalar quantity D) 6000 V along the +x-axis E) 6000 V with no direction, as it is a scalar quantity
A 0.6-cm-diameter mild steel rod at 38°C is suddenly immersed in a liquid at 93°C with ch = 110 W/(m2 K). Determine the time required for the rod to warm to 88°C.
GIVEN
• A mild steel rod is suddenly immersed in a liquid
• Rod diameter (D) = 0.6 cm = 0.006 m
• Initial temperature of the rod (To) = 38°C
• Liquid temperature (T?) = 93°C
• Heat transfer coefficient ( ch ) = 113.5 W/(m2 K)
FIND
• The time required for the rod to warm to 88°C
ASSUMPTIONS
• The rod is 1% carbon steel
• Constant thermal conductivity
• End effects are negligible
• The rod is very long compared to its diameter
• There is radial conduction only in the rod
SKETCH
PROPERTIES AND CONSTANTS
For 1% carbon steel at 20°C:
Thermal conductivity (k) = 43 W/(m K) Specific heat (c) = 473 J/(kg K) Density (?) = 7801 kg/m3 Thermal diffusivity (?) = 1.172 × 10–5 m2/s. [? = k/?c].
A farsighted person cannot see clearly closer than 2.0 m. What power contact lenses would correct this near point to 25 cm?
A. 2.0 D B. 0.5 D C. -0.5 D D. 3.5 D E. -3.5 D
The radius of the Moon's orbit is about ____ times larger than the radius of Earth
a. 0.6 b. 6 c. 60 d. 600 e. 6000