The atmosphere many times is related to the typical

1) Which is hottest? 200 F or 200 C or 200 Kelvin

2) Convert (- 40) C to Fahrenheit .

3) What is the hottest possible temperature?

4) Thermometers are used to measure temperature. There are many different types of thermometers. One type is based on a thermocouple . Briefly describe how a thermocouple works.

5) What is the recommended temperature for inside a residential refrigerator?

A bicycle wheel has a diameter of 63.7 cm and a mass of 1.83 kg. Assume that the wheel is a hoop with all of the mass concentrated on the outside radius. The bicycle is placed on a stationary stand and a resistive force of 125 N is applied tangent to the rim of the tire.

(a) What force must be applied by a chain passing over a 9.10 cm diameter sprocket if the wheel is to attain an acceleration of 4.47 rad/s2?__________N

(b) What force is required if the chain shifts to a 5.50 cm diameter sprocket?___________ N

A billiard ball of mass mA = 0.400 kg moving with a speed vA,0 = 1.80 m/s strikes a second ball, initially at rest, of mass mB = 0.500 kg. As a result of the collision, the first ball is deflected off at an angle of 30.0 o with a speed vA = 1.10 m/s.

a) What is the speed vB and angle of deflection θB of ball B? Take the x axis to be the direction of motion of ball A before the collision.

b) Is the collision elastic? You must support your answer with a calculation.

When two lenses are used in combination, the first one forms an image that then serves as the object for the second lens. The magnification of the combination is the ratio of the height of the final image to the height of the object. A 1.60cm -tall object is 51.0cm to the left of a converging lens of focal length 40.0cm . A second converging lens, this one having a focal length of 60.0cm , is located 300cm to the right of the first lens along the same optic axis.

A)

Find the location and height of the image (call it I1) formed by the lens with a focal length of 40.0cm .

Enter your answer as two numbers separated with a comma in cm

B)

I1 is now the object for the second lens. Find the location and height of the image produced by the second lens. This is the final image produced by the combination of lenses.

Enter your answer as two numbers separated with a comma in cm

If you take a two-litre plastic soda bottle and blow across the lid, you get a very low note. If you squeeze the bottle and make it flat, you get a higher note. What's going on?   

A positron with kinetic energy 2.5 keV is projected into a uniform magnetic field Bvec of magnitude 0.90 T, with its velocity vector making an angle of 89° with Bvec. Find the following values for the positron's helical path.

(a) the period

____s

(b) the pitch

____m

(c) the radius

_____m

Suppose the charge q2 in the figure can be moved left or right along the line connecting the charges q1 and q3. Given that q = +17

A.) A 700- kg car collides with a 1300- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 15.0 km/h in a direction of 30 o with respect to the positive x axis. The heavier car moves at 18 km/h at -41 o with respect to the positive x axis. What was the initial speed of the lighter car (in km/h)?

B.) What was the initial direction (as measured counterclockwise from the x-axis)?

I found the answer for A but can't seem to find the answer for B

A 2.00 mol sample of an ideal gas with a molar specific heat of CV = 5/2 R always starts at pressure 1.50 ✕ 10^5 Pa and temperature 350 K. For each of the following processes, determine the final pressure (Pf, in kPa), the final volume (Vf, in L), the final temperature (Tf, in K), the change in internal energy of the gas (ΔEint, in J), the energy added to the gas by heat (Q, in J), and the work done on the gas (W, in J) a.) The gas is heated at constant pressure to 460 K. b.) The gas is heated at constant volume to 460 K. c.) The gas is compressed at constant temperature to 200 kPa d.) The gas is compressed adiabatically to 200 kPa.

A bar of length ℓ lies on the ?̂-axis with its center at the origin. A proton sits on the ?̂-axis, a height of ℎ above the center of the bar. The bar carries a total charge of ?, which is distributed uniformly along its area.

a. Find the electric field vector experienced by the proton. I ask that you do solve this integral, though you may use any means necessary to do so (yes, including WolframAlpha).

b. Find the electric field vector experienced by the proton if the bar is infinitely long (but still “centered” on the origin).

A series circuit contains a 3.00-H inductor, a 2.40-μF capacitor, and a 25.0-Ω resistor connected to a 120-V (RMS) source of variable frequency. Find the power delivered to the circuit when the frequency of the source is each of the following.
(a) the resonance frequency
(b) one-half the resonance frequency
(c) one-fourth the resonance frequency
(d) two times the resonance frequency
(e) four times the resonance frequency

From your calculations, can you draw a conclusion about the frequency at which the maximum power is delivered to the circuit?

Calculate Brunt-Vaisala Frequency for a neutrally stable dry atmosphere

Many laws govern the physical universe (e.g. Newton's Universal Law of Gravity or Kepler's Laws of Planetary Motion) and can be expressed mathematically. Do you believe that mathematics is inherently part of the universe, or do you believe that mathematics is simply a tool we have developed to model behavior of objects in our universe? Another way of thinking of this issue is the following: why should the universe allow us to describe it mathematically?