Write an essay of 1500 words, giving credible references on "How electricity and magnetism will change our future transportation." Remember to follow the APA style and provide at least five references.

The flywheel of an old steam engine is a solid homogeneous metal disk of mass M = 112 kg and radius R = 80 cm. The engine rotates the wheel at 520 rpm. In an emergency, to bring the engine to a stop, the flywheel is disengaged from the engine and a brake pad is applied at the edge to provide a radially inward force F = 125 N. If the coefficient of kinetic friction between the pad and the flywheel is μk = 0.2.

How many revolutions does the flywheel make before coming to rest?

How long does it take for the flywheel to come to rest?

Calculate the work done by the torque during this time.

if an electron travels 0.200 m from an electron gun to a TV screen in 13.0 ns, what voltage ( inV) was used to accelerate it? (Note that the voltage you obtain here is lower than actually used in TVs to avoid the necessity of relativistic corrections.)

A car start from rest and travels towards a jeep. the jeep starts from rest at the same time with the car and travels toward the car. the car and jeep is 10 km apart. if the acceleration of the jeep and the car are 4 m/s^2 and 7 m/s^2 repectively, when and where will they meet?

List how we are able to measure the age of the Universe.

In a series R-L-C circuit, R= 360 ohm , L= 0.410 H and C= 1.1*10^-2 micro F. 1.What is the resonance angular frequency of the circuit? 2. The capacitor can withstand a peak voltage of 550 V. If the voltage source operates at the resonance frequency, what maximum voltage amplitude can it have if the maximum capacitor voltage is not exceeded?

If a spacecraft has a high specific mechanical energy, what does this tell us about the size of the orbit? Why?

What is the specific mechanical energy, e, of an orbit with a semimajor axis of 42,160 km

1.

A student bikes to school by traveling first dN = 1.00miles north, then dW = 0.500miles west, and finally dS = 0.200miles south.

If a bird were to start out from the origin (where the student starts) and fly directly (in a straight line) to the school, what distance db would the bird cover?

Express your answer in miles.

2.

You will now find the same quantity algebraically, without the need to use much geometry. Take the north direction as the positive y direction and east as positive x. The origin is still where the student starts biking.

Let d? N be the displacement vector corresponding to the first leg of the student's trip. Express d? N in component form.

Express your answer as two numbers separated by a comma (e.g., 1.0,2.0). By convention, the x component is written first.

(a) The sublimation energy of bulk gold is 334 Kjmol-1 and the surface energy is 1.5 Jm2. What percentage of
the bulk bonding energy is lost by atoms at the (111) surface of gold.? The unit cell length of gold is 4.08 Ao

b) Further (to a) calculate the melting temperature for a 4 nm gold particle given a bulk melting temperature
of 1273 K and a density of 19500 kgm-3 and a latent heat of fusion of 12.2 Kjmol-1

A system undergoes a change from one state to another along two different pathways One being reversible and the other being irreversible. What can be said about the relative magnitudes of q reversible and q irreversible?

Please explain in detail.

In the first stage of a two-stage rocket, the rocket is fired from the launch pad starting from rest but with a constant acceleration of 3.50 m/s2 upward. At 25.0 s after launch, the second stage fires for 10.0 s, which boosts the rocket’s velocity to 132.5 m/s upward at 35.0 s after launch. This firing uses up all the fuel, however, so after the second stage has finished firing, the only force acting on the rocket is gravity. Air resistance can be neglected.

Part A

Find the maximum height that the stage-two rocket reaches above the launch pad.

the answer is 3090m

Part B

How much time after the stage-two firing will it take for the rocket to fall back to the launch pad?

Part C

How fast will the stage-two rocket be moving just as it reaches the launch pad?

The volume of a glass bottle is 500.00 ml at 18 ◦C and the longitudinal coefficient of expansion of the glass are 8.0*10−6
1 / ◦C. Benzene has a density of 0.880 g / cm3 at 20 ◦C and its volume expansion coefficient is 1.2 * 10−3
1 / ◦C. How much benzene mass (with 4 values) is contained in the above-mentioned glass bottle at 28 ◦C?

(Answer 435.9 g)

A 5.0 mL syringe has an inner diameter of 5.5 mm , a needle inner diameter of 0.22 mm , and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100. Assume the liquid is an ideal fluid.

Part A

What is the minimum force the nurse needs to apply to the syringe?

Part B

The nurse empties the syringe in 4.9 s . What is the flow speed of the medicine through the needle?

(a) A positive point charge Q is placed at the center of a cube. Draw the field lines for this charge configuration. Include at least 7 field lines and be sure to show them passing through the surface of the cube.

(b) What is the flux through one side of this cube? Hint: Do not under any circumstances integrate to find the flux. Think about how many sides the cube has and whether or not the flux through each face is equal.

(c) If another positive point charge Q is placed outside one of the sides of the cube, how would the flux through that one side of the cube change? How would the flux through the entire cube change?