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A conductor with diameter D carries a current I, with positive charge carriers +q and carrier density n. If the diameter were increased by a factor of 3, keeping +q and n constant, how should the drift velocity change to maintain I ?
A. increase by a factor of 3
B. increase by a factor of 9
C. decrease by a factor of 3
D. decrease by a factor of 9
A satellite is in a circular orbit around the earth. The period of the satellite is 22 hour. Determine what is the speed of the satellite
The wire in a 150 W aquarium heater has a diameter of 0.12 mm and is made of iron, What resistance should the wire have while the heater is operating
A bicycle rider ( mass of bike and rider is 85kg ) travelling eastat 23ms^-1 changes its velocity to 23ms^-1south in 5 seconds. calculate the acceleration. calculate the change in momentum. calculate the impulse given to the bike and rider
A small car is pushing a larger truck that has a dead battery. The mass of the truck is twice as large as the mass of the car. At one instant of time the truck and car both have an acceleration of 3.5 m/s2.
A typical lightbulb in your house is rated 75 W, which means that the bulb dissipates 75 Wwhen connected to a DC voltage of 110 V. What is the current?
A 2.93 kg stone is tied to a thin, light wire wrapped around the outer edge of the uniform 9.83 kg cylindrical pulley, What is the rotational inertia of the pulley
A fan blade rotates with angular velocity given by ?z(t)= ? ? ? t2, where ? = 5.45rad/s and? = 0.835 rad/s3. Calculate the angular acceleration as a function of time
A compound microscope has a barrel whose length is 16.4 cm and an eyepiece whose focal length is 1.7 cm. What focal length must the objective have so the angular magnification of the microscope is -250
On planet Tehar, the free-fall acceleration is the same as that on Earth; however there is also a strong downward electric field that is uniform close to the planet's surface. A 2.01 kg ball having a charge of 5.04 µC is thrown upward at a speed of 2..
A uniform 2.15- kg spinning disk with a radius of 0.233 m is brought to rest by a brake-pad pressed against the side 0.149 m from the rotation axis. What frictional force was applied by the brake pad
A constant-pressure insulated piston-cylinder device contains 1.7 kg of saturated liquid-vapor mixture of water at 150 kPa with an initial quality of 0.2. Calculate the change in exergy of the contents in kJ
A convex mirror has a focal length of magnitude 7.63 cm. Find the magnification of the image.
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