A polar orbiting satellite in ascending mode travels in which direction?
a. ?South to north
b. ?West to east
c. ?East to west
d. ?North to south
Ans: a. ?South to north
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A 1-cm-thick, 1-m-square steel plate is exposed to sunlight and absorbs a solar flux of 800 W/m2. The bottom of the plate is insulated, the edges are maintained at 20°C by water-cooled clamps, and the exposed face is cooled by a convection coefficient of 10 W/(m2 K) to an ambient temperature of 10°C. The plate is polished to minimize reradiation. Determine the temperature distribution in the plate using a node spacing of 20 cm. The thermal conductivity of the steel is 40 W/(m K).
GIVEN
Square plate with water-cooled edges exposed to solar flux
FIND
(a) Temperature distribution in the plate
ASSUMPTIONS
(a) Neglect temperature gradients through the plate thickness
SKETCH
Power: A battery is rated such that it provides 1.0 mW of power at 9.0 V when fully charged. How much current can it deliver?
A. 0.11 mA B. 81 kA C. 0.33 mA D. 9.0 kA
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the acceleration of the car has components of 2.4 m/s2 east and 1.8 m/s2 south. What is the radius of the circle?
a. 0.24 km b. 0.19 km c. 0.32 km d. 0.14 km e. 0.27 km
In a LRC circuit, a second capacitor is connected in parallel with the capacitor previously in the circuit. What is the effect of this change on the impedance of the circuit?
A) It increases. B) It decreases. C) It does not change. D) It increases for frequencies below resonance and decreases for frequencies above resonance. E) It decreases for frequencies below resonance and increases for frequencies above resonance.