Explain how light is produced in the fluorescent light tube about your head using the quantum theory model.

TYY!!!

Suppose the biceps were surgically reattached three centimeters farther toward the person's hand. If the same bowling ball were again held in the person's hand, how would the force required for the biceps be affected? Explain? (Select all that apply.) It would require less force because of the larger distance between the elbow and the location where the force from the biceps acts. It would require more force because the force is less nearly perpendicular to the moment arm. It would require more force because of the larger distance between the elbow and the location where the force from the biceps acts. It would require more force because the force acts closer to the heavy bowling ball. It would require less force because the torque for each newton of force from the biceps is greater. PRACTICE IT Use the worked example above to help you solve this problem. A W = 52.8 N (11.9 lb) weight is held in a person's hand with the forearm horizontal, as shown in the figure. The biceps muscle is attached d = 0.03039 m from the joint, and the weight is l = 0.353 m from the joint. Find the upward force vector F exerted by the biceps on the forearm (the ulna) and the downward force vector R exerted by the humerus on the forearm, acting at the joint. Neglect the weight of the forearm. F = N R = N EXERCISE HINTS: GETTING STARTED | I'M STUCK! Use the values from PRACTICE IT to help you work this exercise. Suppose you wanted to limit the force acting on your joint to a maximum value of 8.13 102 N. (a) Under these circumstances, what maximum weight would you attempt to lift? N (b) What force would your biceps apply while lifting this weight? N

1.

a)What does the author feels is music? What do you considered to be music?

b)How does surround sound work?

c)Does it depend where you are in a room for surround sound to work?

d)Why can a sub-woofer be placed almost anywhere in a room?

e)What is binaural sound? On what classic album did Pink Floyd use extensive use of binaural sound effects   to put” The Lunatic inside your head?”

f)How does bone conduction allow sound to be heard?

g)What is a cochlear implant? What “Culture” was changed because of it, and what is Audism?

2.

a)You have a grandfather clock you have inherited. It currently is not working.

b)You check that the clock is working, and your push the pendulum to start the clock and hear the distinctive tick tock as it swings back and forth. Yet when you come back a half hour later, the pendulum is not moving. What reason could you give for this and how could you fix them?

c) What is Oscillation, and how can that be used to keep time?

d)How are a tuning fork and a quartz stone similar?

3

a. How does Static Friction work in Velcro?

b. How Sliding Friction work in Velcro?

4.

a) How does a moving wheel have both translational and rotational movement?

b) How does an automatic transmission sense when to change gears? How is this determined in a manual transmission vehicle?

c) If you forget to put the lug nuts on a tire and the tire comes off, what does gyroscopic rotation make the tire do?

d) Why would a moving car continue to drive if it lost a wheel?

e) Why do some vehicles have locking hubs to engage 4 wheel drive?

5. You’re a pilot for the Navy. For your airplane to be able to lift itself off the ground, it must be traveling forward with a speed of 208 km/h (130 mph).

a) The force exerted by the jet engine on the airplane causes it to accelerate down the runway. How long must the runway be for the airplane to reach its takeoff speed if the jet accelerates at a rate of 2 mile per second?

b) How does a helicopter fly that allows it to land in a smaller space then a jet?

c) Why do aircraft carriers use more jets than helicopter?

d) What is a sonic boom, and what causes it?

A voltage source, Vs = 180sin760t is in series with an inductor L = 435 mH, a capacitor C = 2 μF, and a resistor R = 240 Ω.

c) What is the phase angle of this circuit? Does the current lead the total voltage or lag behind it?

d) What is the average power delivered by the battery and dissipated by each component? e) What is the instantaneous current in the circuit, I, Vs, VR, VL, VC at t = 3 seconds?

e) What is the instantaneous current in the circuit, I, Vs, VR, VL, VC at t = 3 seconds?

h) Same questions but at the resonance frequency.

Answers according to my professor should be:

c) φ = -.938 rads, The current leads the source voltage by .938 rads or the source voltage lags behind the current by .938 rads.

d) PbatteryAvg = PresistorAvg = 23.60 watts, PinductorAvg = PcapacitorAvg = 0 watts

e) I(3) = +.0626 amps, Vsource = -128.65 volts, VR = +15.04 volts, VC = -288.85 volts, VL = +145.15, Vtot = -128.65 volts [Note: Vsource = Vtot = VL + VC + VR] For instantaneous voltages, they simply add up like a regular addition at any time t!

h) φ = 0 rads, The current is in phase with the source voltage.

PbatteryAvg = PresistorAvg = 67.42 watts,

PinductorAvg = PcapacitorAvg = 0 watts

I(3) = -.478 amps, Vsource = -114.74 volts, VR = -114.74 volts, VC = -269.51 volts, VL = +269.51 volts, Vtot = -114.74 volts

You are considering installing a photovoltaic (PV) system on the roof of your one-storey home. Discuss four (4) factors that need to be taken into consideration with the installation of a PV system for providing electrical power to the home.

?⃗ = (2?)?̂− (3?)?̂
?⃗⃗ = (1?)?̂− (2?)?̂

Find
a) ?⃗ − 2?⃗⃗
b) ?⃗ ∙ ?⃗⃗
c) ?⃗ × ?⃗⃗
d) Angle between ?⃗ and ?⃗⃗

A pipe transporting a fluid has an internal diameter of 5.0 m. The fluid has a flow rate of 5.00 × 10−2 m3 /s and a viscosity of 1.00 × 10−3 N/m2 ∙s. The fluid has a density of 695 kg/m3 and a pressure of 1.62 × 104 Pa. Consider the fluid to be ideal. a) Calculate the speed of the fluid in the pipe. b) What is the maximum diameter that the pipe must have if the flow is to be laminar? c) The pipeline rises 10 m into a secondary pipe of internal diameter 2.4 m. What is the new pressure of the fluid in the secondary pipe? d) Under what flow conditions would you expect to have as little energy losses as possible when transporting the fluid? Clearly justify your response.

An object is formed by attaching a uniform, thin rod with a mass of mr = 7.04 kg and length L = 5.16 m to a uniform sphere with mass ms = 35.2 kg and radius R = 1.29 m. Note ms = 5mr and L = 4R.

1)What is the moment of inertia of the object about an axis at the left end of the rod?

2) If the object is fixed at the left end of the rod, what is the angular acceleration if a force F = 418 N is exerted perpendicular to the rod at the center of the rod?

3) What is the moment of inertia of the object about an axis at the center of mass of the object? (Note: the center of mass can be calculated to be located at a point halfway between the center of the sphere and the left edge of the sphere.)

4) If the object is fixed at the center of mass, what is the angular acceleration if a force F = 418 N is exerted parallel to the rod at the end of rod?

5) What is the moment of inertia of the object about an axis at the right edge of the sphere?

what are the requirements for a solid ionic conductor? provide an example to aid your explanation

In technical normal state air the initial phase of a 310Hz frequency, 0.07Pa sound pressure amplitude free, plane wave traveling in +x direction is 60degree. Determine the sound pressure in the sound field 18minutes later, 175m far from the origin! Let calculate the sound pressure level as well, in the same place!

A mass hangs from the ceiling by a spring. It takes the mass 700 ms to fall from its maximum height of 2.3m to its minimum height of 1.6m above the floor.

(a) At what height above the floor does the mass have zero acceleration?

(b) What is the maximum speed of this mass?

(c) If you start a timer ( t = 0) at the moment when the mass is falling below a height of 1.9m, then at what time t will the mass first reach a height of 2.1m?

1. When you throw a pebble straight up with initial speed V, it reaches a maximum height H with no air resistance. At what speed should you throw it up vertically so it will go twice as high?

a. Insufficient information

b. 18 V

c. V sqrt(2)

d. 4 V

e. 8 V

2. A 60.0-kg man stands at one end of a 20.0-kg uniform 10.0-m long board. How far from the man is the center of mass (or center of gravity) of the man-board system?

a. 1.25m

b. 5m

c. 9m

d. 2.5m

A box of weight 120 N sits on a level surface. It is initially at rest. The coefficient of kinetic friction is 0.30 and the coefficient of static friction is 0.50. A person goes up to the box and pushes horizontally with a force of 45 N. What is the force of friction acting on the box during the push?

We are looking down at a film at 90 deg, and a shining orange light with a wavelength(vacuum) of 710 nm is on the film. It has a refractive index of n = 1.32, and is surrounded by air.

A) draw out a diagram with refractive indices of the surfaces

B) What is the minimum thickness of the film for it to look bright due to reflected light?

Pls show steps and whatever else you can show to understand the question, thanks!