A basic electrical circuit consists of a battery, a light bulb, a switch and wires connecting them. As soon as the switch is closed, even the light bulb is one mile away, the light bulb will be on IMMEDIATELY.  This means that the electrical current (made of moving electrons) starts to run everywhere in the wire as soon as the switch is closed . Explain what happen and the source(s) of these free moving electrons.

Two cars approach each other. Initially they are separated by 1000 m. One car accelerates at 2 m/s^2 from rest. The other car travels at a constant speed of 20 m/s. Draw distance indicating how far from each of the cars' starting point the cars will collide.

Many chemical reactions release energy. Suppose that at the beginning of a reaction, an electron and proton are separated by 0.135 nm , and their final separation is 0.105 nm .

How much electric potential energy was lost in this reaction (in units of eV)?

A particle with charge 7 µC is located on the x-axis at the point −4 cm , and a second particle with charge 4 µC is placed on the x-axis at 8 cm . What is the magnitude of the total electrostatic force on a third particle with charge −4 µC placed on the x-axis at 2 cm ? The Coulomb constant is 8.9875 × 109 N · m2 /C 2 . Answer in units of N.

How can you tell if an object is charged? Explain using induction or conduction or friction.

A stone is dropped into a river from a bridge at a height h above the water. Another stone is thrown vertically down at a time t after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second stone? Give your answer in terms of the given variables and g.

Explain interactions between the following phases:
a)solid-liquid
b)solid-gas
c)gas-liquid
d)liq.1-liq.2

The SBD Dauntless was a dive-bomber that was used by the United States Navy during World War II. Consider one such aircraft flying with a velocity of 103 m/s at an angle θ below the horizontal. The aircraft releases a bomb when its altitude is 2.15 km above sea level. At the point when the bomb is released, the magnitude of the displacement from the bomb to its target at sea level is 2.68 km. What is the angle θ? (Give your answer in degrees. Consider θ to be a positive value, measured downward from the horizontal axis.)

_________ ° downward from the horizontal

1. Horses are to race over a certain English meadow for a distance of 6.4 furlongs. What is the race distance in units of (a) rods and (b) chains? (1 furlong = 201.168 m, 1 rod = 5.0292 m, and 1 chain = 20.117 m.)

2.The micrometer (1 μm) is often called the micron. (a) How many microns make up 2.2 km? (b) How many centimeters equal 2.2 μm? (c) How many microns are in 2.2 yd?

The arrangement in the drawing shows a block (mass = 14.6 kg) that is held in position on a frictionless incline by a cord (length = 0.599 m). The mass per unit length of the cord is 1.20

A physics TA pushes a 20.0 kg equipment cart at a constant velocity for a distance of 28.0 m down the hall. The force she exerts on the cart is directed at an angle 20.0° below the horizontal, and the force of friction opposing the motion of the cart is 48.0 N. Determine the following. (a) the magnitude (in N) of the force exerted on the cart by the TA (b) the work done (in J) by the force the TA exerts on the cart (c) the work done (in J) by the force of friction acting on the cart (d) the work done (in J) by the force of gravity acting on the cart

(a) A 2 kg object is at the base of a 35° incline, initially at rest, and sits on top of a spring (k = 240 N/m) which is parallel to the inline. The spring is compressed 0.40 m from its equilibrium position and then released, propelling the object up the incline. While the object slides it experiences a frictional force of 2.00 N. Diagram this situation below. Remember to include coordinate axes.

(b) Apply conservation of energy to determine the speed of the object at the moment the spring reaches equilibrium. Explain all terms. If any terms equal zero explain why.

(c) Apply conservation of energy to determine how far up the incline the object will reach (above the spring’s equilibrium position). Explain all terms. If any terms equal zero explain why.

(d) Apply conservation of energy to determine how much the spring will compress in stopping the object as it slides back down the incline. Explain all terms. If any terms equal zero explain why.

-How can you determine the distance to a spacecraft from the time it takes its radio signal to reach Earth?

-What do gamma rays, X-rays, light, and radio waves all have in common?

-Which type of reflector telescope would be the easiest to construct, and why?

-Contrast image formation in reflectors and refractors.

-A reflecting telescope has a mirror diameter of 4.0 m. What is the angular resolution of the telescope for red light of wavelength 0.7 μm?

-What is the resolution of a telescope?

-What is true of radio telescopes?

-One advantage of the Hubble Space telescope over ground based ones is that....

1. List the viewing systems for fluoroscopy. What is SNR? What would be an acceptable SNR for a fluoro viewing system? (2 points)

A 25-L sample of an ideal gas with ? = 1.67 is at 250 K and 50 kPa. The gas is compressed adiabatically until its pressure triples, then cooled at constant volume back to 250 K, and finally allowed to expand isothermally to its original state.

a. Sketch this cyclical process in a pV diagram (the sketch should be drawn to scale and labelled).

b. How much work is done on the gas?

c. For each step in the process determine the heat energy.