An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when the elastic potential energy of the system object-spring is a minimum?
A) at either A or B
B) midway between A and B
C) one-third of the way between A and B
D) one-fourth of the way between A and B
E) at none of the above points
B
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Write the energy balance for an ice pond at noon on a sunny day with solar energy of 300 W/m2 to the ice, air at -8ºC, convective heat transfer coefficient of 10 W/m^2?K above the ice, and 1ºC water with a convective heat transfer coefficient of 30 W/m^2?K below the ice. Then estimate the rate at which the ice thickness is increasing or decreasing.
What will be an ideal response?
The sky is flat, like a sheet of paper, and hence angular diameter is the distance measured along that flat sheet of paper
a. True b. False Indicate whether the statement is true or false
Density: A plastic block of dimensions 2.00 cm × 3.00 cm × 4.00 cm has a mass of 30.0 g. What is its density?
A. 0.80 g/cm3 B. 1.20 g/cm3 C. 1.25 g/cm3 D. 1.60 g/cm3
A policeman walks on his beat back and forth. His average speed is determined from
A. time divided by how far he ends up from the starting point. B. his velocity divided by the time. C. time divided by his total distance covered. D. his total distance covered divided by the time.