A child on a sled starts from rest at the top of a 15° slope. If the trip to the bottom takes how long is the slope? Assume that frictional forces may be neglected
A) 293 m
B) 586 m
C) 1130 m
D) 147 m
Answer: A
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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
Zeros at the beginning of a number are significant
Indicate whether the statement is true or false
A kilogram is a unit of
A) mass. B) weight. C) both the same D) none of the above
Which of the following statements about nuclear reactions is most true?