physics help asap please

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Find the total force on the top and sides of a rectangular container that is 45cm wide, 63cm long, and 22cm in height.

 A sperical ball of metal, of radius 14cm, is submersed in a liquid whose density is 1.57 kg/m3. The density of the metal is 4.76 x 10 to the 3rd kg/m3. What is the tension in the cord holding the submersed ball? 
 An iron bar that is 22.5cm long is at room temperature (25 C). To what temperature must the bar be heated in order to increase its length to 22.65cm?
A balloon of radius 24cm is filled with helium at 39 c. What will be the volume of the balloon if the temperature is decreased to -45c?
A rectangular solid of dimensions 12cm x 23cm x 34cm is lying on a solid surface on its largest face. If the pressure it exerts on the surface is 3.2 x 10 squared Pa, what is the density of the solid?
A hydraulic lift system has two pistons; a small piston of area 5.4 x 10 to the negative second m squared and a larger piston of area 2.6 x 10 to the negative first m squared. What perpendicular force must be applied to the end of a handle 65cm long if the torque given the handle by the applied force is  exerting a force on the smaller piston to lift a 1300N crate?
A hollow cube made from a metal alloy(density= 3.24 x 10 to the third kg/m cubed) has sides of length 24.5cm. If the cube will implode when the pressure on its sides reaches 8.1 kPa, what is the maximum depth in seawater (density 1.12 x 10 to the third kg/m cubed) the cubed could be placed without imploding?
A rectangular barge is 75cm long, 25cm wide and 18m deep. When empty the water level is 12 m from the top of the barge. When "fully loaded", the water level  rises to 4, from the top? What is the weight of a "full load"?

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