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Physics homework help

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physics

 

People often use the term energy crisis, implying that we are running out of energy. How can this be if energy is conserved? If we are not running out of energy, what are we really running out of?

 

A common misconception is that the current is "used up" and steadily declines as it progresses through a series of resistors.

A common misconception is that the current is "used up" and steadily declines as it progresses through a series of resistors. That would be a violation of conservation of charge. What is actually used up is the electric potential energy of the charge carriers, some of which is delivered to each resistor.



QUESTION Explain why the current in a real circuit very slowly decreases with time compared to its initial value.

Three long parallel wires

Three long parallel wires are 3.8 cm  {\rm cm} from one another. (Looking along them, they are at three corners of an equilateral triangle.) The current in each wire is 9.50A  A , but its direction in wire M  {\rm M} is opposite to that in wires N  {\rm N} and P (see the figure (Figure 1) ).

1)Determine the magnitude of the magnetic force per unit length on wire M due to the other two.

2)Determine the angle of the magnetic force per unit length on wire M due to the other two.

PHY - A 35 kg uniform ladder is leaned against a building

 

A 35 kg uniform ladder is leaned against a building. The 5 m tall ladder makes an angle of 60 degrees with the ground. The ladder encounters a coefficient of static friction from the ground of 0.3 and a coefficient of static friction with the wall of 0.42.

A painter must climb two-thirds of the ladder to reach a blank spot on the wall. What is the maximum mass that the painter can have before the ladder begins to slip? (HINT: use the conditions for equilibrium. There are two frictional forces and two normal forces)

PHY - A cylindrical tube oriented vertically on Earth’s surface

A cylindrical tube oriented vertically on Earth’s surface, closed at the bottom and open at the top (height 100 m, cross sectional area 1 m2) initially contains air at a pressure of one atmosphere and temperature 300 K. A disc of mass m plugs the cylinder, but is free to slide up and down without friction.

PHY-One mole of nickel (6 1023 atoms) has a mass of 59 grams

One mole of nickel (6 1023 atoms) has a mass of 59 grams, and its density is 8.9 grams per cubic centimeter, so the center-to-center distance between atoms is 2.23 10-10 m.

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