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The applied field is further increased till superconductivity is completely destroyed. The strength of the field is now 8Ã Ã 105gauss. The correlation length of the superconductor is:
a. 20 Ã
b. 50 Ã
c. 628 Ã
d. 2000 Ã
The penetration depth of this superconductor is
a. 100 Ã
b. 200 Ã
c. 1000 Ã
d. 314 Ã
A geologist working in the field drinks her morning coffee out of an aluminium cup. The cup has a mass of 0.12kg and is initially at 20°C when she pours in 0.3kg of coffee initially at 70°C.
What is the final temperature after the coffee and the cup attain thermal equilibrium? (Assume that coffee has the same specific heat capacity as water and there is no heat exchange with the surroundings.) (5 marks)
Direction: answer the following questions below.
- A block of mass 1.0 kg rests on a horizontal surface. The frictional coefficients for the block and surface are μs=0.50 and 40.μk=0.40. (a) What is the minimum horizontal force required to move the block? (b) What is the block’s acceleration when this force is applied?
- The coefficient of kinetic friction between the board and the snow is 0.20. 10.0°𝜇𝑘 = The snowboarder is now moving down a hill with incline. What is the skier’s acceleration?
At the center of the square, what is the magnitude of the electric field?
Q1. A silicon wafer is 0.5 mm thick
(a) A potential of 100mV is applied across the thickness, what is the electron drift velocity if their mobility is 0.2m/V-s. (b) How much time is required for an electron to move across the thickness?
A horizontal disc of radius 9.00 cm rotates about an axis which passes vertically through the center of the disc with angular velocity of 100 r.p.m. A small particle of mass 10g is dropped onto the disc and sticks to the edge of the disc. If the angular velocity is reduced to 90 r.p.m, determine the moment of inertia of the disc about the axis.
What is the gravity of a fall with time 1 sec and height 3m ?
The data sheet of a quad two-input NAND gate specifies the following parameters: IOH(max.)=0.4 mA, VOH(min.)=2.7 V, VIH (min.)=2V, VIL(max.)=0.8 V, VOL(max.)=0.4 V, IOL(max.)=8 mA, IIL(max.)=0.4 mA, IIH (max.)=20x10-6A, ICCH(max.)=1.6 mA, ICCL(max.)=4.4 mA, tpLH =tpHL=15 ns and a supply voltage range of 5 V. Determine
(a) the average power dissipation of a single NAND gate
(b) the maximum average propagation delay of a single gate
(c) the HIGH-state noise margin (d) the LOW-state noise marg
#339914 on Dec 2023