Answer:
Explanation:
Answer D. Interaction between a pen and paper while you write
Answer:
F = 0i (in the x-direction), 0j (in the y-direction),-8.59*10^-4 N k (In the z-direction)
Explanation:
The force given by charged particles moving in a magnetic field is given below (cross is cross product, they don't have that format in the equation tool):
Now we can perform the cross product between v and B
d{array}\right][/tex]
Now multiply by Q (charge) to get the force
F = -8.59*10^-4 N k
F = 0i, 0j, (-8.59*10^-4)k
Answer:
Torque = 8.38Nm
Explanation:
Time= 8.00s
angular speed (w) =400 rpm
Moment of inertia (I)= 1.60kg.m2 about its rotation axis
We need to convert the angular speed from rpm to rad/ sec for consistency
2PI/60*n = 0.1047*409 = 41.8876 rad/sec
What constant torque is required to bring it up to an angular speed of 40rev/min in a time of 8s , starting from rest?
Then we need to use the formula below for our torque calculation
from basic equation T = J*dω/dt ...we get
Where : t= time in seconds
W= angular velocity
T = J*Δω/Δt = 1.60*41.8876/8.0 = 8.38 Nm
Therefore, constant torque that is required is 8.38 Nm
<span>Disadvantages:
One of the main disadvantages is the initial cost of the equipment used
to harness the suns energy. Solar energy technologies still remain a
costly alternative to the use of readily available fossil fuel
technologies. As the price of solar panels decreases, we are likely to
see an increase in the use of solar cells to generate electricity.
A solar energy installation requires a large area for the system to be
efficient in providing a source of electricity. This may be a
disadvantage in areas where space is short, or expensive (such as inner
cities).
Pollution can be a disadvantage to solar panels, as pollution can
degrade the efficiency of photovoltaic cells. Clouds also provide the
same effect, as they can reduce the energy of the suns rays. This
certain disadvantage is more of an issue with older solar components, as
newer designs integrate technologies to overcome the worst of these
effects.
Solar energy is only useful when the sun is shining. During the night,
your expensive solar equipment will be useless, however the use of solar
battery chargers can help to reduce the effects of this disadvantage.
The location of solar panels can affect performance, due to possible obstructions from the surrounding buildings or landscape.
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