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3 years ago

How much heat is absorbed by a 35g iron skillet when its temperature rises from 14oC to 79oC? Joules

1 answer:

7 0

Data:
Q (Amount of heat) = ?(in Joule)
m (mass) = 35 g
c (Specific heat of iron) = 0.45 J/(g × ° C)
T (final) = 79 ºC
To (initial) = 14 ºC
ΔT = T - To → ΔT = 79 - 14 → ΔT = 65 ºC

Formula:
Q = m*c*ΔT

Solving:
Q = m*c*ΔT
Q = 35*0.45*65
$\boxed{\boxed{Q = 1023.75\:Joules}}\end{array}}\qquad\quad\checkmark$

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3 years ago

A 5kg block is pulled across a table by a horizontal force of 40 N with a frictional force of 8 N opposing the motion. Draw a fo

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Answer:

Net force on the block is 32 N.

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Let the acceleration of the object be $a$ m/s².

Given:

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The free body diagram of the object is shown below.

From the figure, the net force in the forward direction is given as:

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3 years ago

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So the net force acting on the box is

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$F_{net}=ma$