What does the mean radiant temperature represent?
What will be an ideal response?
The mean radiant temperature is the average or mean temperature of the
surrounding surfaces of an observer or sensor. As a first approximation it is an
arithmetic average or mean of the product of the surrounding surface
temperatures divided by 3600 of observation or contact.
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The ____________________ of a star can be determined from its color
Fill in the blank(s) with correct word
A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 22.0 cm from the mirror, what is its focal length?
a. 44.0 cm c. 18.6 cm b. 48.3 cm d. 56.0 cm
?Suppose a particle is moving along a straight line with a speed v for a time t, then stops for a time t, and then resumes moving along the original direction with speed v for time t. What has been the average speed of the particle for the total time period 3t?
A) v
B) 
C) 1.5v
D) 
A pendulum with a bob of mass 150 g has the same period as a thin rod (not massless) of the same mass and length 17 cm when the rod is pivoted about its end. What is the length of the pendulum?
A. 12 cm B. 15 cm C. 22 cm D. 27 cm