You have a wire of length L = 1.7 m for making a square coil of a dc motor. The current in the coil is I = 0.8 A, and the magnetic field of the motor has a magnitude of B = 0.31 T. Find the maximum torque exerted on the coil when the wire is used to make (a) a single-turn square coil and (b) a two-turn square coil.

Electrons are initially traveling at 2.40×106 m/s in the horizontal direction. They enter a region between two charged plates of length 2.00 cm and experience an acceleration of 4.00×1014 m/s2 vertically upward. Find: (a) the vertical position as they leave the region between the plates; (b) the angle at which they emerge from between the plates

A nozzle with a radius of 0.16 cm is attached to a garden hose with a radius of 0.88 cm that is pointed straight up. The flow rate through hose and nozzle is 0.35 L/s.
Part (a) Calculate the maximum height to which water could be squirted with the hose if it emerges from the nozzle in m.

Part (b) Calculate the maximum height (in cm) to which water could be squirted with the hose if it emerges with the nozzle removed, assuming the same flow rate.

1. What direction does the light polarize when striking a
non-metallic surface?

2.  When unpolarized light falls on two crossed Polaroids, no light passes through. What happens if a third Polaroid, with axis at 45 to each of the other two, is placed between them?

1. Is electric charge a discrete or continuous quantity? Explain.
2. What fundamental particle is the most common “charge carrier” we run into in everyday life?

While driving fast around a sharp right turn, you find yourself pressing against the car door.

What is happening?

What is happening?

Which of the following point towards the center of the circle in uniform circular motion?

The Moon does not crash into the Earth because:

In the International Space Station which orbits Earth, astronauts experience apparent weightlessness because

In the International Space Station which orbits Earth, astronauts experience apparent weightlessness because

Question 1: In areas of enhanced heat flow, geothermal heating can be used to supply heating to homes, either by using ground water directly or by placing a water reservoir at depth. In Iceland, where the average temperature over the year is 4.6ºC, the geothermal flux can be as high as 300 mW m^-2.

1. If you wanted to be able to supply a home with indoor temperature at 25ºC and water at a temperature of 55ºC, how deep would your reservoir need to be? (1 mark)

2. Why might Iceland have such a high geothermal flux compared to other areas?

3. Does high geothermal flux accelerate the melting of ice sheets, why or why not?

A charge of -4 µ C is located at (x, y) = (0, 0) and a second charge of 2 µ C is located at x = 1. (a) Find a general expression for the electric field. (b) At what point, if any, will the electric field vanish?

Subject: Physics + Economics

Life Cycle Diagram:

1) Consider the provision of hot water using an electric water heater fueled by electricity produced from natural gas in a centralized powerplant. Draw a process flow diagram for this energy service with at least four stages in the supply chain. List at least four social or environmental impacts that result from process and identify where in your diagram the impacts occur.

2) List and describe three weakness of life cycle assessment for evaluating future energy systems, and suggest ONE solution for one of the weakness.

3) List & explain two separate factors that can lead to an energy source having a low Levelized Cost of Energy [LCOE] despite the high capital cost.

How is the path length difference calculated in objective question 1 of chapter 18 (Physics for Scientists and Engineers, ninth edition)? Why is it changed by 0.2 m upon sliding the tube up 0.1m?

Two 10-cm-diameter charged disks face each other, 23 cm apart. The left disk is charged to - 50 nC and the right disk is charged to + 50 nC .

A)

What is the electric field E⃗ , both magnitude and direction, at the midpoint between the two disks?

B)

C)What is the force F⃗  on a -3.0 nC charge placed at the midpoint?

A point charge q₂ = -3.9 μC is fixed at the origin of a co-ordinate system as shown. Another point charge q₁ = 4.5 μC is is initially located at point P, a distance d₁ = 8.2 cm from the origin along the x-axis

Point R located at d₂ = 3.3 cm

The charge q₂ is now replaced by two charges q₃ and q₄ which each have a magnitude of -1.95 μC, half of that of q₂. The charges are located a distance a = 2 cm from the origin

What is the potential energy of the system composed of the three charges q₁, q₃, and q₄, when q₁ is at point R? Define the potential energy to be zero at infinity.