calculate the work done when: a) a 55 N force acting at an angle of 28 degrees to the horizontal pushes an object 5m horizontally. b) a spring of spring constant 45n/m is stretched by 32cm.

6-Torque on a coil. A circular loop of wire has a diameter of 20.0 cm and contains 10 loops. The current
in each loop is 3.00 A, and the coil is placed in a 2.00-T external magnetic field. Determine the maximum
and minimum
torque exerted on the coil by the field.

Your employer asks you to build a 23-cm-long solenoid with an interior field of 6.0 mT . The specifications call for a single layer of wire, wound with the coils as close together as possible. You have two spools of wire available. Wire with a #18 gauge has a diameter of 1.02 mm and has a maximum current rating of 6 A. Wire with a #26 gauge is 0.41 mm in diameter and can carry up to 1 A.

A) Which wire should you use?
B) What current will you need?

Find the electric field vector anywhere in the plane of a dipole. Let the charge value on one
charge be q. Let them be separated by d. Let the origin be in between them. And say they are
each on the y axis.

Please include a diagram in your answer

Find numerical examples of energy usage and thermodynamic computations of efficiency. Use the web to compare the efficiencies of several power production processes. Which are in use and which are planned?

Be sure to cite your sources. Wikipedia, while useful, is not a primary source, and you should not cite it.

To earn the maximum number of points for this discussion, you must:

Post your response of at least 150 words

the total voltage change around a circuit is always positive.

this is a false statement. why?

In the figure (Figure 1) a conducting rod of length L = 37.0 cm moves in a magnetic field B⃗ of magnitude 0.500 T directed into the plane of the figure. The rod moves with speed v = 6.00 m/s in the direction shown.

Part A

What is the potential difference between the ends of the rod?

Part C

When the charges in the rod are in equilibrium, what is the magnitude of the electric field within the rod?

Part F

What is the potential difference across the rod if it moves parallel to ab?

Part G

What is the potential difference across the rod if it moves directly out of the page?

A 1210 kg car is driving on 60 km/h on an inclined plane. The car is located on the top of the plane. The plane is 655 m long and the angle is 4.50 degrees.

a) What will the speed of the car be if there is no friction ?

b) Now the car is on 85 km/h at the bottom of the inclined plane. How much friction force works on the car its way down ?

c) If the same friction force works on the car as when it drow up the plane, what does the mechanical power need to be so the car can drive on 85 km/h ?

d) Lets assume thet the same friction force works on the car that drives in a normal driving. How much gas will the car spend on a hundred ef the heat of reaction of the gas is 38 MJ/liters and the efficiency is 21 %

Help please.

A fulcrum is placed at the 55 cm position of a 100 cm (1 meter) stick with a mass of 18 kg. a 10 kg mass is placed at 70 cm position. where must a 5 kg mass be placed so that the net torque is zero? (assume the mass of the meter stick is uniformly distributed)

You use a slingshot to launch a potato horizontally from the edge of a cliff with speed υ0. The acceleration due to gravity is g. Take the origin at the launch point. (a) How long after you launch the potato has it moved as far horizontally from the launch point as it has moved vertically? What are the coordinates of the potato at this time? (b) How long after you launch the potato is it moving in a direction exactly 45° below the horizontal? What are the coordinates of the potato at this time?

Through cunning physics trickery I have trapped a point charge Q at the center of a thin-walled hollow conductive sphere of radius R, which itself carries a net charge of -3Q.

a.    How much charge will collect on the inside surface of the hollow sphere?

b.   How much charge will collect on the outside surface of the hollow sphere?

c.    Draw a picture of this arrangement, including a depiction of any electric field lines.

d.   Graph the resulting electric field E as a function of distance from the center, r.

A spring gun fires a bullet of mass m=.04 kg horizontally at a ballistic pendulum apparatus with a mass M=.350. the bullet lodges itself into the pendulum. After collision, the center of mass of the bullet and pendulum rises by .07 meters. What is the approximate initial speed v of the bullet?

- In a cylindrical container with a base area A, there are N monatomic gas particles at temperature T which are ideal. The upper part of the container is closed with a lid which has a weight M and can moves upward and downward without friction . There is vacuum on the lid and the whole system is under gravity.
a) Calculate the balance position of the lid. When performing this calculation, you can assume that the cover is quite narrow in the vertical.

- Suppose the system is completely isolated from the outside, doubling the weight of the lid (2M).
b) Determine the new temperature T* of the gas and the new equilibrium position of the lid.
c) Calculate the change in the entropy of the gas.

Show that the equation v²=v₀² −2g(y−y₀) is dimensionally consistent. (use dimensional analysis)