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Illustrates the concepts pertinent to this problem. A refrigerator has a surfaces area of 5.3m^2. It is lined with 0.075-m-thick insulation whose thermal conductivity ia 0.030J/(s.m.C°). The interior temperature is kept at 5°C, while the temperature at the outside surface is 25°C. How much heat per second is being removed from the unit?
1. One end of an iron poker is placed in a fire where the temperature is 502°C, and the other end is kept at a temperature of 26°C. The poker is 1.2m long and has a radius of 5.0×10^-3m. Ignoring the heat lost along the length of the poker, find the amount of heat conducted from one end of the poker to the other in 5.0s
A particle is falling freely under gravity . In first t seconds it covers distance x and in next t seconds, it covers distance y. Then t is given by
a)((y-x)/g)^1/2
b)((y+x)/g)^1/2
c)((2(y-x))/g)^1/2
e)((2(y+x))/g)^1/2
a)((y-x)/g)^1/2
b)((y+x)/g)^1/2
c)((2(y-x))/g)^1/2
e)((2(y+x))/g)^1/2
A stone is dropped from a top a tower and one second later, a second stone is thrown vertically downward with a velocity 20m/s.The second stone will overtake the first after travelling a distance of
A car accelerates from rest at a constant rate for the first 10s and covers a distance of x. It covers a distance of y in the next 10s with the same acceleration. Which of the following is true
a)x=3y
b)y=3x
c)x=y
d)y=2x
a)x=3y
b)y=3x
c)x=y
d)y=2x
An aeroplane takes off at an angle of 60o to the horizontal. If the component of the velocity along the horizontal is 200m/s, what is the actual velocity? Also find the vertical component of its velocity
A 1500-kg car is ascending the ramp of a garage inclined at 10° with constant speed when the force applied is P. determine the magnitude of force P if u=0.70
1a) objects A and B have the same mass of 3.0kg. They melt when 3.0×10^4 J of heat is added to A and when 9.0×10^4 J is added to B. Determine the latent heat of fusion for the substance from which each object is made.
b) Find the heat required to melt object A when its mass is 6.0kg
2) Find the mass of water that vaporizes when 2.10kg of murcury at 205°C is added to 0.110 kg of water at 80.0°C.
b) Find the heat required to melt object A when its mass is 6.0kg
2) Find the mass of water that vaporizes when 2.10kg of murcury at 205°C is added to 0.110 kg of water at 80.0°C.
1. Find the direction cosines of the vector joining the two points (4,2,2) and (7,6,14)
If the threshold wavelength for photoelectric effect on sodium metal is 5000A0, find its work function.
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#195387 on Feb 2018
#195387 on Feb 2018 
