1.In an electric car, regenerative braking is used to recharge batteries.
The principle of regenerative braking involves converting the
kinetic energy of the vehicle into energy stored in a battery. If a
car is traveling at a speed of 30 km/h and is stopped completely
by braking, what would be the energy stored in the battery if the
mass of the car is 1000 kg and the energy conversion effi ciency is
assumed to be 100%? If this braking happens at a constant rate for
5 seconds, what is the average rate of power transfer?
2.The inductance of a coil is computed from:
L = N2μA
where L is the inductance in Henrys, N is the number of windings,
A is the cross-section area of the core, and μ is the permeability
of the medium. An inductor of 2 cm core diameter and 200
turns in the coil is 6 cm long. If the current fl owing through the
conductor is 0.5 A and the permeability of the medium is 1.257E-6
N /m, compute the energy stored in the coil.
3.The velocity in a system is expressed in the following
v = 2t2m/ s, 0 ≤ t ≤ 5
v = 50m/ s, 5 < t ≤ 20
If the damping coeffi cient B = 10 Ns/m, plot the power dissipated
through this damper as a function of time. How much is the total
energy dissipated over the time period of 20 seconds?
4.For mechanical translation, rotation, hydraulic, and electric
domains draw a tetrahedron of state. For each case write the relevant
variables for each domain at the four corners and write down
the relationships between these variables.
5.Consider two electrical conductors of the same material and
length. One is 0.5 mm in diameter, and the other one is 1 mm. For
the same potential difference applied across both these conductors,
which will allow higher current?
|Due By (Pacific Time)||01/19/2015 12:00 am|
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