The homeowner installs an electrically heated mirror into the shower room.When a person has a shower, the heated mirrors does no
2 answers:
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Answer: k=
Explanation:
Recall that the formula for kinetic energy is given below as
k =
where k=kinetic energy (joules), m= mass of object (kg), v= velocity of object m/s)
For cart A
= mass of cart A
= v = velocity of cart A
= kinetic energy of cart A
hence, =
For cart B
= mass of cart B
= 2v = velocity of cart B
= kinetic energy of cart B
hence, =
= 2
from the question, both cart are identical which implies they have the same mass i.e =
= m which implies that
and
The total kinetic energy K is the sum of cart A and cart B kinetic energy
hence
Answer:
A.)1.52cm
B.)1.18cm
Explanation:
angular speed of 120 rev/min.
cross sectional area=0.14cm²
mass=12kg
F=120±12ω²r
=120±12(120×2π/60)^2 ×0.50
=828N or 1068N
To calculate the elongation of the wire for lowest and highest point
δ=F/A
= 1068/0.5
δ=2136MPa
'E' which is the modulus of elasticity for alluminium is 70000MPa
δ=ξl=φl/E =2136×50/70000=1.52cm
δ=F/A=828/0.5
=1656MPa
δ=ξl=φl/E
=1656×50/70000=1.18cm