The magnetic field 44.0 cm away from a long, straight wire carrying current 3.00 A is 1360 nT.

(a) At what distance is it 136 nT?

*(No Response)* cm

(b) At one instant, the two conductors in a long household
extension cord carry equal 3.00-A currents in opposite directions.
The two wires are 3.00 mm apart. Find the magnetic field 44.0 cm
away from the middle of the straight cord, in the plane of the two
wires.

*(No Response)* nT

(c) At what distance is it one-tenth as large?

*(No Response)* cm

(d) The center wire in a coaxial cable carries current 3.00 A in
one direction, and the sheath around it carries current 3.00 A in
the opposite direction. What magnetic field does the cable create
at points outside the cables?

*(No Response)* nT

In: Physics

write a one page summary about robotics. This summary should include a brief description of the topic, important terminology, and why it is important to know and understand this topic. The summary should use a minimum of three sources. The sources may be from professional magazine articles (such as SC Magazine, CIO, Computer World).

Please paste the link to the source.

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In a demolition derby, a 600kg Audi is traveling at 15m/s 30 degrees west of south. A 700 kg BMW is traveling at 10 m/s 40degrees north of east. They collide. After the collation, the Audi is redirected to 20 degrees north of wests and the BMW is redirected to 50 degrees south east. solve for velocity

In: Physics

The better resolution obtained with a high-numerical-aperature
objective is accompanied by reduced *contrast* and *depth
of field*. Why?

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A cannon is elevated at an angle of 30 degrees and fires a
cannonball with a speed "v_{1}". The Cannon is on top of a
cliff with a height of "h". Given v_{1} and h,
determine:

a) The speed of the cannoball when it is at its maximum height.

b) The speed of the cannonball just before hitting the ground.

c) The angle the cannonball's velocity makes with the horizontal just before hitting the ground.

d) The horizontal distance the ball travels before hitting the ground.

e) The time the cannonball is in the air.

In: Physics

- A plane electromagnetic wave with magnetic field amplitude 0.02 T is propagating through a vacuum.

- What is the electric field amplitude? B) What is the magnitude of the Poynting vector?

C. If the wavelength is 500 nm what is the wave frequency and the energy of a single photon?

D. How many of these photons must pass through a square meter each second to yield the power flux calculated in part B?

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A parallel-plate capacitor with plate separation of 1.0 cm has square plates, each with an area of 6.0 × 10 -2 m 2. What is the capacitance of this capacitor if a dielectric material with a dielectric constant of 2.4 is placed between the plates, completely filling them? ( ε 0 = 8.85 × 10 -12 C 2/N ∙ m 2)

A)1.3 × 10-12 F

B)1.3 × 10-10 F

C)64 × 10-14 F

D)15 × 10-12 F

E)15 × 10-14 F

In: Physics

explain why the signal enhancement can result in a transient NOESY experiment. (hint: you might find it easier to answer this question if you draw an energy diagram)

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A sled slides without friction down a small, ice-covered hill. If the sled starts from rest at the top of the hill, its speed at the bottom is 8.20 m/s. (a) On a second run, the sled starts with a speed of 2.80 m/s at the top. When it reaches the bottom of the hill, is its speed 11.0 m/s, more than 11.0 m/s, or less than 11.0 m/s?

more than 11.0 m/s

equal to 11.0 m/s

less than 11.0 m/s

Explain.

(b) Find the speed of the sled at the bottom of the hill after the second run. m/s

In: Physics

5.) Most homes have an outdoor faucet to which they can attach a standard 3/4 inch (diameter) garden hose. When it is attached to a standard garden hose, Fred's outdoor faucet delivers water at a rate of 7.6 feet/sec. In order to water a larger area, Fred splits his standard hose into three 1/2 inch lines. If the water is distributed through all of the 1/2 inch hoses equally, what is the volume flow output of each of the 1/2 inch lines.

6.) Oil is flowing through a pipeline at a speed of 1.44 m/s. If the diameter of the pipe is 0.86 m, what is the volumetric flow rate?

7.) The air above an airplane wing moves faster than the air below it. A certain airplane wing is 35 meters by 3.1 meters. The wind speed above the wing is 260 m/s and below it is 223 m/s. Assuming that the elevation and air density (1.29 kg/m3) are approximately the same at these two points, what is the pressure difference caused by the wind speeds?

8.) A fountain is designed to spray a column of water 9 m into the air. What minimum velocity must the water have exiting the nozzle in order to reach the desired water height?

9A.) A hand-pumped water gun is held at height of 1.3 m above the ground. The water stream lands 8.7 meters away. What is the exit velocity of the stream?

9B.) What is the gauge pressure of the gun's reservoir, assuming the velocity of the water is zero and doesn't change height before leaving the reservoir?

10.) A large dam has a hole that is 42 meters from the top. If the water in the reservoir is descending at a rate of 0.69 m/s, how fast is the water exiting the hole?

In: Physics

1- What is the difference between energy and intensity as far as light waves are concerned? How would you change the energy? How would you change the intensity? Are these changes independent of one another? Why or why not?

a- Discuss what changes you might expect to see if the energy of the light wave was changed for the double slit experiment. Why?

b- Discuss what changes you might expect to see if the intensity of the light wave was changed for the double slit experiment. Why?

In: Physics

A Rail Gun uses electromagnetic forces to accelerate a projectile to very high velocities. The basic mechanism of acceleration is relatively simple and can be illustrated in the following example. A metal rod of mass m and electrical resistance R rests on parallel horizontal rails (that have negligible electric resistance), which are a distance L apart, as shown in (Figure 1). The rails are also connected to a voltage source V, so a current loop is formed.

The vertical magnetic field, initially zero, is slowly increased. When the field strength reaches the value B0, the rod, which was initially at rest, begins to move. Assume that the rod has a slightly flattened bottom so that it slides instead of rolling. Use g for the magnitude of the acceleration due to gravity.

Find μs, the coefficient of static friction between the rod and the rails.

Express the coefficient of static friction in terms of variables given in the introduction.

In: Physics

Physics 2

1. A 7.5 kg box that has an initial speed of 4.0 m / s slides along a rough board and reaches rest. Estimate the total change in the entropy of the universe. Assume that all objects are at room temperature (293 K)

2. What is the efficiency of a Carnot engine that is operating between a hot reserve at 800 K and a cold reserve at 400 K?

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What is the mass of a baseball if the kinetic energy is 122 J
when the baseball is thrown at 103 mph? (in grams)

A batter hits a pop fly, and the baseball reaches an altitude of
230 ft. If we assume that the ball was 3 ft. above home plate when
hit by the batter, what is the ball's increase in potential energy?
(in joules)

In: Physics

This question is inspired by this question/answer pair: Is this formula for the energy of a configuration of 3 fluids physically reasonable?

Consider three immiscible fluids forming contact surfaces, where none of the three can make a lubrication layer for the other two (the surface energy between fluid 1 and fluid 2 is not decreased by putting a thin layer of fluid 3 inbetween them, and likewise for the other two permutations). In this case, if all the contact surface tensions are positive, you have a minimum energy when all the surfaces are flat.

But there is a separate line tension for the 3-fluid interface itself. Can this line tension be negative? If it is negative, the line would like to wriggle, but the surface tension will require that the wriggles straighten themselves out as quickly as possible, to make the surface energy least. In this case, the minimizing energy configuration seems to be a very rapidly wriggling curve which is only infinitesimally different at the atomic scale from straight line. This suggests that a negative line-tension always renormalizes to exactly zero line-tension at long wavelengths. Is this correct?

Are there experimental or computational 3-phase line interfaces with a negative line tension? Do they renormalize to a zero line tension limit? Does this mean that zero line tension is a common observation?

In: Physics