Why is Titan considered so interesting?
What will be an ideal response?
It has a thick atmosphere which may be similar to that on Earth in ancient times.
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A laser beam sends a uniform radiation beam towards the hemispherical opening in a solid housing with dimensions as shown. The surface of the cavity is black and essentially insulated from the surrounding housing material. The hemispherical cavity is a thin-walled metal with a black surface. The temperature of the housing as well as that of the surroundings is 25°C. Determine the radiant flux of the laser beam, G0 [W/m2], if a thermocouple located on the hemispherical surface indicates a temperature of 10°C.
GIVEN
• Laser beam sending uniform radiation beam towards the hemispherical opening.
• Temperature of housing and surrounding (T?)= 250C.
• Temperature difference on thermocouple in hemispherical surface (?Tc) = 100C.
FIND
• Radiant flux of the laser beam.
ASSUMPTIONS
• Cavity surface is black and perfectly insulated from its mounting material.
• Negligible convection heat transfer from cavity surface.
• Surroundings are large, isothermal.
What is the particle X in the reaction 
a. 
b. 
C. e-
D. 
A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the horizontal impulse the catapult receives from the rock is
a. 5.1 × 10^4 Ns. b. 6.1 × 10^4 Ns. c. 8.0 × 10^4 Ns. d. 5.0 × 10^5 Ns. e. 6.0 × 10^5 Ns.
A convex mirror has a focal length of ?20 cm. What is the object distance if the image distance is ?10 cm?
A. 10 cm B. 40 cm C. 60 cm D. 20 cm E. 30 cm