the kinetic energy if an object of mass m moving with a velocity of 5ms is 25Jwhat will be its kinetic energy when its velocity is doubled ?what will be its kinetic energy when its velocity is increaed three time?s
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Answered by
2
Let the mass be m
v = 5m/s
K.E = 25 J
K.E = 1/2 mv^2
25 = 1/2 m (5)^2
25 x 2 = 25m
m = 2 kg
Now if the velocity becomes 3 times then the velocity is 3 x 5 = 15m/S
Now new K.E = 1/2 x 2 x 15^2
= 225 J
hope this answer was helpful :)
atul3834:
one last question
yes pls
electric heater is rated 1500 w how much energy does it use in 10 h
Given:
Power=1500W=1500/1000=1.5kW
time=t=10hours.
Energy=Power x t
=1.5 X 10
=15kWh
Hence , the energy consumed by the heater in 10h is 15kwH
Power=1500W=1500/1000=1.5kW
time=t=10hours.
Energy=Power x t
=1.5 X 10
=15kWh
Hence , the energy consumed by the heater in 10h is 15kwH
hope it do helps you :)
thanks
my pleasure ^-^
Answered by
0
Let the mass be m
v = 5m/s
K.E = 25 J
K.E = 1/2 mv^2
25 = 1/2 m (5)^2
25 x 2 = 25m
m = 2 kg
Now if the velocity becomes 3 times then the velocity is 3 x 5 = 15m/S
Now new K.E = 1/2 x 2 x 15^2
= 225 J
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