How much energy is needed to change the temperature of 50.0 g of water by 15.0oc?

3135 J of energy is needed to change the temperature of 50g of water by .

Given :

Mass of water is 50g

Change in temperature =

Solution :

We know that energy needed to increase the temperature of a substance is,

  ---- (1)

where,

m is the mass of the substance,

is the specific heat capacity of the substance,

  ---   (specific heat of water)

and is the change in temperature.

Now put the values of  in equation (1) we get,

3135 J of energy is needed to change the temperature of 50g of water by .

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two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

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