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Q.8 When a potential difference of 221 V is applied to two plates of a parallel-plate capacitor, the inner surface of the positive plate carries a surface charge density of 40 nC/cm2 . The permittivity of a vacuum is 8.85419 × 10^?12 C 2 /N · m2 . What is the spacing between the plates? Answer in units of µm
Dan is gliding on his skateboard at 4. He suddenly jumps backward off the skateboard, kicking skateboard forward at 8.00 (as measured by an observer on the ground). Dan's mass is 60 and skateboard's mass is 5.00 .How fast is Dan going as his fee..
A banked circular highway curve is designed for traffic moving at 77-km/h. The radius of the curve is 153 m. Traffic is moving along the highway at 46-km/h on a rainy day. What is the minimum coefficient of friction between tires and road that wil..
A ranger in a national park is driving at 52 km/h when a deer jumps onto the road 86 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of -2.9 m/s2.
What minimum heat is needed to bring 138g water at 22°C to the boiling point and completely boil it away.
An electric field of intensity 3.4 kN/C is applied along the x-axis. compute the electric flux through a rectangular plane 0.350 m wide and 0.700 m long if the following conditions are true.
A U-shaped tube open to the air at both ends contains some mercury. Calculate the vertical distance h from the top of the mercury in the right-hand arm of the tube to the top of the water in the left-hand arm
A rubber balloon filled with air is rubbed against a wool sweater and acquires a negative charge. The balloon is placed up against a flat wall and released. The balloon stays stuck to the wall. How is this possible if the wall is not charged in an..
A certain loudspeaker has a diameter of 45 cm. At what frequency would the wavelength of sound it emits in air be equal to its diameter.
A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity, What is the maximum acceleration that the plane can have without the cup sliding backward on the table
A vertical tube 1.9cm in diameter and open at the top contains 4.0g of oil (density 0.82 g/cm^3) floating on 4.0g of water. Find the gauge pressure at the oil-water interface
How much energy is necessary to place three charges, each of 3.0 micro Coulomb's, at the corners of an equilateral triangle of side 2 cm.
A sealed cubical container 22.0 cm on a side contains three times Avogadro's number of molecules at a temperature of 20.0°C
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