Imagine you and your friends are running in the neighborhood like electrons flowing through a circuit. Makeup stories that would serve as analogies for a parallel versus series circuits. Summarize the similarities and differences between the series and parallel circuits. Include your reasoning about what you think is happening.

Describe the temperature response of resistors in a circuit. Are there any devices which take advantage of this property? If so, explain how they work in terms of the properties of electrons.

A small metal sphere, A, carrying a charge of +15.0 µC is at the origin. An identical sphere, B, carrying a charge of -18.0 µC is at ~xB = 4.0ˆi cm and a third sphere, C, carrying +25.0 µC is at ~xC = 3.0ˆj cm.

(a) Find the total electrical force exerted on sphere A.

(b) Let us view sphere A as a probe charge which we are using to measure the field due to spheres B and C. Use your result from part b) to find the electric field (note that this is a vector) at the origin.

(c) Sphere A is released so that it is free to move. It has a mass of 5.0 g and no forces other than the electrostatic forces found in a) act on it. What is its acceleration at the instant of release?

(d) A short time later will your answer from c) still be the correct acceleration for sphere A?

(e) Spheres B and C are touched together and then returned to their original locations. Sphere A is also returned to its original location. Now what is the force on sphere A?

Wile standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 6.79m/s. the stone is subsequently falls to the ground, which is 12.1m below the point of where the stone leaves your hand. How much time is the stone in the air?

All eyeglass lenses have chromatic aberration. This is usually expressed as dioptric spread. For a typical +6.0 D lens, the focusing power for red light is +5.90 D,the power for green light is +6.00 D, and the power for blue light is +6.10 D. This gives a dioptric spread of 0.20 diopter. Suppose a myopic person is observing a distant object through this lens, and the green light of the image is in perfect focus. Assume a distance s′ = 1.7000 cm.

a. How far in front of or behind the retina is the point of sharp focus for red light?

Express your answer with the appropriate units. Enter positive value if the point of sharp focus is behind the retina and negative value if the point of sharp focus is in front of the retina.

b. How far in front of or behind the retina is the point of sharp focus for blue light?

Express your answer with the appropriate units. Enter positive value if the point of sharp focus is behind the retina and negative value if the point of sharp focus is in front of the retina.

A car travels along a straight east-west road. A coordinate system is established on the road, with x increasing to the east. The car ends up 19 mi west of the intersection with Mulberry Road.

(A) If its displacement was -21 mi , how far from Mulberry Road did it start?

For College Physics. Please explain in paragraph form.

Respond to the following:

• In your own words, explain vector, scalar, speed, velocity, and linear acceleration. Also give examples.

A 10 kg block is placed on an inclined plane that is at an angle of 30 degrees with respect to the horizontal. THe coefficient of kinetic friction between the block and the plane is .1. The block is released from rest at 5m above a spring that is also lying on the plane. The spring has a constant of 50 N/m. What is the max compression of the spring?

a.) Two identical particles of charge 3 μμC and mass 6 μμg are initially at rest and held 3 cm apart. How fast will the particles move when they are allowed to repel and separate to very large (essentially infinite) distance?

b) Now suppose that the two particles have the same charges from the previous problem, but their masses are different. One particle has mass 6 μμg as before, but the other one is heavier, with a mass of 48 μμg. Their initial separation is the same as before. How fast are the particles moving when they are very far apart? [Enter the heavier particle's final speed in the first box and the lighter particle's final speed in the second box.]

A car is to be hoisted by elevator to the fourth floor of a parking garage, which is 48 ft above the ground. Part A If the elevator can accelerate at 0.8 ft/s2, decelerate at 0.3 ft/s2, and reach a maximum speed of 8 ft/s, determine the shortest time to make the lift, starting from rest and ending at rest.

Indicate which statements are true or false

Only very small objects have an associated wave function.

Electrons show interference effects like waves.

The quantization of frequencies is specific to quantum physics.

Light can display particle properties,

Quantum effects are only visible at microscopic scales.

In nature, is mechanical energy always conserved (yes or no) why?

When the potential difference between the plates of a capacitor is halved, the magnitude of the electric energy stored in the capacitor U:

a. is 2U b. is U/2 c. remains the same d. is U/4

EXPLAIN.

A cylindrical aluminum pipe of length 1.42 m has an inner radius of 1.60 ×10^-3 m and an outer radius of 3.39 ×10^-3 m. The interior of the pipe is completely filled with copper. What is the resistance of this unit? (Hint: Imagine that the pipe is connected between the terminals of a battery and decide whether the aluminum and copper parts of the pipe are in series or in parallel.)

A charge 4.98 nC is placed at the origin of an xy-coordinate system, and a charge -1.99 nC is placed on the positive x-axis at x = 4.01 cm . A third particle, of charge 6.05 nC is now placed at the point x = 4.01 cm , y = 2.98 cm .

a. Find the x-component of the total force exerted on the third charge by the other two.

b. Find the y-component of the total force exerted on the third charge by the other two.

c. Find the magnitude of the total force acting on the third charge.

d. Find the direction of the total force acting on the third charge. (THETA)

A batted baseball is hit with a velocity of 44 m/s, starting from an initial height of 4 m. Find how high the ball travels in two cases:

(a) a ball hit directly upward and

(b) a ball hit at an angle of 69° with respect to the horizontal.

Also, find how long the ball stays in the air in each case.

case a:

case b: