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F = x 10 ^ 5 ( final answer )
1000 = m /
, mass = kg
= 780 x x 1.5
Work done = J
iii) P = T
Power = W ( final answer )
= 95000 / 120000 x
Efficiency = %
= 90000 /
= W ( final answer )
Less energy.
Less energy.
Same .
W = d
= 90 x
Work = J ( final answer )
Power = Time
joule in 1 .
P = W t
= x 20 / 60
P = / T
= W ( final answer )
tension = N
Potential energy = J
iii) P = 69600 /
= 4640
efficiency = 4640 /
efficiency = % ( final answer )
Work done = distance moved in the direction of the force.
extension = cm ( final answer )
Chemical energy to energy.
Kinetic energy to energy.
gravitational potential energy= g x h
= 0.35 x x 6
gravitational potential energy = J ( final answer )
= 75 x x 20
Change in potential energy = x 10 ^ 4 J
V ^ 2 =
V = under root 200
Speed = m / s ( final answer )
increases.
m = 240 /
mass = kg ( final answer )
= 54 x x 2.8
work done = J
= 1512 /
Power = w ( final answer )
W = 1.2 x
W =
= 2 / 0.096
number =
= 0.096 / 0.2
P = W ( final answer )
iii) 1.( Burning ) use of a fossil fuel e.g
potential energy
K.E = 1 / 2 v^2
= 1 / 2 x x 5 ^ 2
Kinetic energy = J ( final answer )
1 / 2 x ( 4.2 x 10 ^ 7 ) x ^ 2
energy = x 10 ^ 9 J
E = P T
E = 8.4 x 10 ^ 5 x x 60
energy output = x 10 ^ 9 J
iii) efficiency = total energy input.
= 1.5 x 10 ^ 9 / x 10 ^ 9
efficiency = % ( final answer )
( Recheked)
= x 10 ^ 9 W
5.0 x 10 ^ 9 x x 2 ( 3600)
= x 10 ^ 13 J ( final answer )
W = D
= 4900 x
= J
P = T
= 117600 /
= x 10 ^ 3 W ( final answer )
F = a
a = 2.8 x 10 ^ 6 / x 10 ^ 8
a = m / s ^ 2 ( final answer )
= 5 x
gravitational potential energy = J ( final answer )
G.P.E = g x h.
mgh =
5400 = x 10 x h
H = 5400 / 60 x
H = m . ( final answer )
MJ / S ( final answer )
X = 17 . 5 /
Energy input = J ( final answer )
= 14000 /
=
= 7000 /
= {[ 120 ]] W. ( final answer ) .
MJ / S ( final answer )
density = volume
1000 = – 4100 / volume
V = 2400 /
Volume = m ^ 3 ( final answer )
iii) waste causes ( storage ) problems or explosions.
1. .
ii) energy.
GPE = g x h
= x 10 x 850
= x 10 ^ 7 J ( final answer )
V = 5 x 10 ^ -4 x
M = 5 x 10 ^ -4 x 0.066 x
Mass = kg
= kg / m ^ 3 ( final answer )
= 24 x
= kg .
= 24000 x 4200 x
E = m
= x 2.3 x 10 ^ 6
= x 10 ^ 10 J ( final answer )
K.E = 1 / 2 v ^ 2
= 1 / 2 x ( 4.4 x 10 ^ 4 ) x ^ 2
Kinetic energy = x 10 ^ 6 J ( final answer )
A ) can nor be and neither be destroyed.