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

Physics & Space Science

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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

Physics & Space Science

Zeros at the beginning of a number are significant

Indicate whether the statement is true or false

Physics & Space Science

Which of the following statements about nuclear reactions is most true?

a. For high energies, the reaction is likely to be a compound nucleus reaction. b. At low energies, the reaction is likely to be a direct reaction. c. Nuclear reactions around a few hundred MeV are generally referred to as medium-energy nuclear reactions. d. Pions begin emerging from nuclear reactions at a little over 48 MeV.

Physics & Space Science

A kilogram is a unit of

A) mass. B) weight. C) both the same D) none of the above

Physics & Space Science