Answer:
a)0.364 ns
b)1.43 x 10^-3
c)163.21 x 10^-5 m
Explanation:
mass of the positron is m=9.1 x 10^-31 kg
charge is q=1.6 x 10^-19 C
strength of the magnetic field is B=0.0980 T
kinetic energy is K=2.30 keV=2.30 x 10^3 x 1.6 x 10^-19 J
0.5mv^2=6.68 x 10^-16 J
0.5 x 9.1 x 10^-31 x v^2 =3.68 x 10^-16
v=2.84 x 10^7 m/s
a)the period is T=2πm/qB
=2π(9.1 x 10^-31 )/1.6 x 10^-19x 0.0980
=0.364 ns
b) pitch is p=vcosθ(2πm/qB)
=2.84 x 10^7x cos82(0.364 x 10^-9)
=1.43 x 10^-3
c) radius is r=mvsinθ/qB
=(9.1 x 10^-31 )2.84 x 10^7x sin82/1.6 x 10^-19x 0.098
=163.21 x 10^-5 m
The wording of the choices is really unclear. With two resistors in parallel,
here's the situation:
-- The voltage across each resistor is the same as the voltage across
the other one. If the parallel combination is connected to the battery,
then the voltage across each resistor is the full battery voltage.
-- The current through each resistor is (V) / (the resistance of that resistor).
That's the same current as would flow through that resistor if the other one
were not there.
-- As long as the battery or other power supply holds out, neither of these
quantities changes.
Can you match this situation to one of the choices listed ?
It looks to me as if choice 'C' is the one that's most likely
trying to say this.
Answer:
Plate B will have a higher capacitance
Explanation:
One of the conditions affecting the capacitance of a capacitor is spacing between plates, the greater the spacing the lesser the capacitance and vice versa.
Hence plate B will have the B will have higher capacitance since the spacing is less when compared with that of plate A
Answer:
12,558 J
Explanation:
The amount of heat absorbed by the water is given by:
where
m = 50 g is the mass of the water
is the water specific heat
is the temperature increase of the water
Substituting into the formula, we find
Answer:
Work done, W = 5534.53 J
Explanation:
It is given that,
Force acting on the piano, F = 6157 N
It is pushed up a distance of 2.41 m friction less plank.
Let W is the work done in sliding the piano up the plank at a slow constant rate. It is given by :
Since, 
(in vertical direction)
W = 5534.53 J
So, the work done in sliding the piano up the plank is 5534.53 J. Hence, this is the required solution.
