Due to the vast scale of the universe, when we observe a star in the night sky, we are seeing it
A) not as it is now, but as it will be in the future
B) as it was at the moment the universe formed
C) as it is right now
D) not as it is now, but as it was in the past
D
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A 2.0 kg object is moving at a velocity of 12.0 m/s. The drag force 6.0 N. If the drag force is given by the equation F = 
then the value of b is
a. 
b. 
c. 
d. 
e. 
A wall of thickness L is made up of material with a thermal conductivity that varies with its thickness x according to the equation k=(ax+b) W/(m K) , where a and b are constants. If the heat flux applied at the surface of one end (x=0) of the wall is 20 W/m^2, derive an expression for the temperature gradient and temperature distribution across the wall thickness ( between x=0 and x=L). Use and define appropriate notations for surface temperatures at each end of the wall.
GIVEN • Thermal conductivity (k) varies according to equation k=(ax+b) W/(m K) • Heat flux applied (q/A)=20 W/m^2 FIND • Expression for temperature gradient and temperature distribution across wall thickness. ASSUMPTIONS • One dimensional, steady state conduction through the glass • Constant thermal conductivity
Two dogs are pulling on opposite ends of a bone, each with a force of 150N, in opposite directions along the length of the bone. What is the tension in the bone?
A. 0N B. 150N C. 300N D. More information is needed to answer this question.
What is the significance of large percentage of oxygen in Earth's atmosphere?
What will be an ideal response?