a ceiling fan consists of a small cylindrical disk with 5 thin rods coming from the center the disk has mass md=2.6 kg and radius R=0.24 m the rods each has mass mr=1.4 kg and length L=0.75m1). what is the moment of inertia of each rod about the axis of rotation? 2). what is the moment of inertia of the disk about the axis of rotation? 3).what is the moment of inertia of the whole ceiling fan? 4).when the fan is turned on it takes t=3.6 s and a total of 12 revolutions to accelerate up to its full speed what is the magnitude of the angular acceleration? 5). what is the final angular speed of the fan? 6). what is the final rotational energy of the fan? 7).now the fan is turned to a lower setting where it ends with half of its rotational energy as before the time it takes to slow to this new speed is also t=3.6 s what is the final angular speed of the fan? 8). what is the magnitude of the angular acceleration while the fan slows down?

A curve of radius 73 m is banked for a design speed of 75 km/h . If the coefficient of static friction is 0.39 (wet pavement), at what range of speeds can a car safely make the curve?  [Hint: Consider the direction of the friction force when the car goes too slow or too fast.] Express your answers using two significant figures separated by a comma. (v min, v max in km/h)

1) a. consider a ball of m= 0.50kg. does it take the same amount of additional energy to vertically lift it from 25cm to 30cm as it does to lift from 30cm to 35 cm? if not, which takes more. Why?

b. does it take the same amount of additional energy to speed your car (mass m=1000 kg) up from 25m/s to 30m/s as it does to speed it up from 30m/s to 35m/s? if not which takes more? Why?

c. consider a spring with k=10N/m. Does it take the same amount of additional energy to stretch the spring from 25cm to 30 cm as it does to stretch it from 30cm to 35 cm? If not, Which takes more? why?

Please explain each part thanks!.

Question 9

Name the following unit of energy: the change in electric potential energy as an electron moves through a potential difference of one volt.

Joule (J)

Volt (V)

Electron volt (eV)

Watt (W)

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question 10

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Consider two charged particles situated as follows: One charge –2q is located on the y axis at a distance d from the origin, and the other charge –q is located on the x axis at a distance 2d from the origin. What is the total electric potential at the origin?

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–2kq/d

–kq/(2d)

–5kq/(2d)

–kq/d

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Question 13

Every point on an equipotential surface

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is at zero electric potential.

is a a positive electric potential.

is at a negative electric potential.

is at the same electric potential.

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Question 14

Which of the following statements concerning equipotential surfaces is true?

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Electric field lines are directed parallel to these surfaces.

The electric potential on one equipotential surface is equal to that on all other equipotential surfaces.

The net work done by the electric force is zero when moving along an equipotential surface.

The net work done by the electric force in moving a charge from one equipotential surface to another is zero.

In the figure, a metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end. A magnetic field of magnitude B = 0.417 T points out of the page. (a) If the rails are separated by 34.5 cm and the speed of the rod is 48.6 cm/s, what is the magnitude of the emf generated in volts?(b) If the rod has a resistance of 26.4 ? and the rails and connector have negligible resistance, what is the current in amperes in the rod? (c) At what rate is energy being transferred to thermal energy?

1. What is the objective of this assignment?
2. Briefly explain the Doppler Effect.
3. Set both the listener velocity v_L and the source velocity v_S to -2 m/s. Run the demo. What is the value of the frequency f_L? Does it change or remain constant?
4. Set the listener velocity v_L to -2 m/s and the source velocity v_Sto -5 m/s. Run the demo. What is the value of the frequency f_L? Does it change or remain constant? If there is a change, when does it take place? Explain.
5. Set v_L = 0. Set v_S = -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, and 5 m/s
   
   For each of the above values of v_S, record the value of f_L. That should give you 11 data points, each point corresponding to one value of v_S and its corresponding value of f_L. Type the values of v_S in column A and the values of f_L in column B.
6. On an x-y graph, plot the values of f_L as a function of the values of v_S(f_Lvalues go on the vertical axis and v_S values go on the horizontal axis). Include this plot in your report.
7. Describe the curve of f_L versus v_S, and write a short conclusion.

A cat rides a merry go round turning with uniform circular motion. At time t1=2.00s, the cat's velocity is gives by Vx = 3.00 m/s and Vy = 4.00 m/s. At t2 = 5.00 s,the cat's velocity is give by Vx = -3.00 m/s and Vy = -4.00 m/s. Take the coordinate system of the merry go round to have its origin at the center.

(a) What is the magnitude of the cat's centripetal acceleration?

(b) What is the magnitude of the cat's average acceleration during the time interval t2-t1?

(c) Assuming uniform circular motion before t1, what would have been the x-y coordinate location of the cat at t0= 0.00 s?

(d) What angle relative to the positive y-axis does the centripetal acceleration vector point at t= 3.00 s?

A body moves along a straight line, its distance from the origin at any instant being given by the equation x = 8t − 3t^2, where x is in centimeters and t is in seconds.

(a) Find the average velocity of the body in the interval from t = 0 to t = 1 sec, and in the interval from t = 0 to t = 4 sec.

(b) Find the expression for the average velocity in the interval from t to t + Δt.

(c) What is the limiting value of this expression as Δt approaches zero?

(d) Find the time or times at which the body is at rest. (e) Find the expression for the acceleration at any time.Type or paste question here

The big prediction here is how the masses, the radius, the period, and the angle interrelate. Please predict the angle that the string makes below the horizontal (the angle of declination) for the following combinations of masses, radii, and periods:

m (whirling mass) = 0.010 kg

m (hanging weight) = 0.100 kg

radius = 1 meter period =

1 second per revolution

A particle is represented by the following wave function:

(a) Use the normalization condition to find C ?

(b) Evaluate the probability to find the particle in an interval of width 0.01 at x = 0.1 (that is, between x = 0.095 and x = 0.105.)(No integral is necessary for this calculation.)

(c)Evaluate the probability to find the particle between x=0.19 and x=0.35.

(d) Find the average values of x and x², and the uncertainty of x: Δx=√(x²)_av-(x_av)²

What is the acceptance cone angle of a multimode optical fiber assuming that light is passing through some coupling oil at the LED driver source end and that oil has refractive index about that of olive oil, where 1) the core is high-index flint glass and the cladding is Plexiglas 2) the core is crown class and the clad is soda lime glass?

The capacity of a storage battery, such as those used in automobile electrical systems, is rated in ampere-hours (A?h). A 50 A?h battery can supply a current of 50 A for 1.0 h, or 25 A for 2.0 h, and so on.

(I need some help on Part A & C Thank you : )

Part A

What total energy can be supplied by a 10V , 80A?h battery if its internal resistance is negligible?

Express your answer using two significant figures.

Part B

What volume (in liters) of gasoline has a total heat of combustion equal to the energy obtained in part (a)? (See Section 17.6; the density of gasoline is 900 kg/m3.)

Express your answer using two significant figures.

Ans: 7.0*10^-2

Part C

If a generator with an average electrical power output of 0.45kW is connected to the battery, how much time will be required for it to charge the battery fully?

Express your answer using two significant figures.

One of the conditions for Uniform Circular Motion is that the acceleration be centripetal and directed toward the center of motion. What would the effect be of a non-zero acceleration parallel to the tangential velocity?

The following data table gives the position of an object during freefall. The time interval between adjacent points is 1/60 seconds.

What is the instantaneous velocity (in cm/s) of the object when it is at position 9?