Suppose a lake has a layer of ice 12 cm thick on its surface. the top of the ice layer is cooled by the atmosphere to -4.75° c. the lower surface is in contact with water at 0.0° c. the thermal conductivity of ice is 0.004 cal/(s · cm · c°). (a) at what rate is heat transferred through a 1.2 cm2 area of the ice? answer 1 0.0019 correct cal/s (b) how long will it take to freeze an additional 1.2 mm of ice onto the lower surface of the ice?

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the device is called “ rocket engine”

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards