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True or False?
1. Current density is a measure of the amount of current flowing through a volume.
2. The conventional direction of current is the hypotheticaldirection of movement of positive charges through the wires of anelectric circuit.
3. Through a certain cross-sectional area of a wire, one coulomb ofelectrons pass each second. In this case, the current through thewire is equal to one ampere.
4. A 10-ohm resistor has a constant current. If 1200 C of chargeflow through it in 4 minutes, the value of the current is 5A.
5. Current density is a measure of the amount of current through across-sectional area.
The ultracentrifuge is an important tool for separating and analyzing proteins. Because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite si..
A small blob of putty of mass m=12 g falls from the ceiling and lands on the outer rim of a turntable of radius R= 20 cm, find the post-collision angular speed of the turntable-putty system
A coal fired plant generates 600 MW (5.18 x 10^13 J/day) of electric power. The plant burns 4.8 x 10^6 kg of coal each day. what is the ideal efficiency of this plant
a water storage tank is an upright cylinder of height 8 m and radius 6 m. The storage tank is full of water but is vented to the atmosphere. What volume flow of water is lost out the hole
Proper design of automobile braking systems must account for heat buildup under heavy braking.
A solid object is made of two materials, one material having density of 2 000 kg/m3 and the other having density of 6 000 kg/m3. what is its average density
A student sits on a rotatingstool holding two 2.0kg objects. When his arms are extendedhorizontally, the objects are 1.0 m from the axis of rotation, andhe rotates with an angular speed of 0.75 rad/s. Find the new angular speed of the student
A long, straight wire carrying a current of 3.00 A is placed along the axis of a cylinder of radius 0.500 m and a length of 2.00 m
several students are riding in bumper cars at an amusement park. the combined mass ofcar a and its occupant is 250 kg.
A 150 g aluminum cup contains 150 g of water and both are at 13 C. If you add 150 g of hot water at 90 C what is the final temperature at thermal equilibrium? How much hot water at 90 C needs to be added to achieve a final temperature of 44 C?
The Moon is 3476 km in diameter and orbits the Earth at an average distance of 384,400 km. What is the angular size in radians of the Moon as seen from Earth
A pulsar is a rapidly rotating neutron star that emits a radio beam the way a lighthouse emits a light beam. We receive a radio pulse for each rotation of the star. The period T of rotation is found by measuring the time between pulses. The pulsar..
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