Answer:
Part a)
Part b)
Explanation:
Part a)
Energy required to raise the temperature of water from 17.8 degree C to 21.6 degree C is given by formula
here we know that
Here the volume of the water is given as
now the mass of water is
now the heat required is
Part b)
As we know that power is supplied at
so here we know
so here we have
Answer:
A) Burning fossil fuels pollutes the environment
The time it takes for a point to reach 0 displacement from maximum displacement is
of a cycle. Thus, one period (
) will take
.
The frequency is simply
.
The speed is given by:
Answer:
Explanation:
Consider downward displacement first .
downward displacement h = 38 m .
downward acceleration = g
downward initial velocity u = 0
h = ut + 1/2 g t ²
38 = 0 + 9.8 t ²
t = 1.97 s
During this period , there will be horizontal displacement with initial velocity u = 10 m /s and acceleration a = 1.6 m /s²
s = ut + 1/2 a t²
= 10 x 1.97 + .5 x 1.6 x 1.97²
= 19.7 + 3.10
= 22.8 m
Answer. Balanced
Explanation. Balanced forces provides an equal reaction to each action. For example, if you push on a wall, your hand isn’t going to go through. This is because the push is equal to the pull and the forces are balanced.
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