1. Describe what a grounding wire does. ( In detail)

2. Is electrostatics a contact or field force? And how do we know that?

Consider a particle with initial velocity v? that has magnitude 12.0 m/s and is directed 60.0 degrees above the negative x axis.

A) What is the x component v? x of v? ? (Answer in m/s)

B) What is the y component v? y of v? ? (Answer in m/s)

C) Now, consider this applet. Two balls are simultaneously dropped from a height of 5.0 m.How long tg does it take for the balls to reach the ground? Use 10 m/s2 for the magnitude of the acceleration due to gravity.

To monitor the breathing of a hospital patient, a thin belt is girded around the patient's chest as in the figure below. The belt is a 160 turn coil. When the patient inhales, the area encircled by the coil increases by 40.0 cm2. The magnitude of earth's magnetic field is 50.0

At the Earth's surface, a projectile is launched straight up at a speed of 10.5 km/s. To what height will it rise? Ignore air resistance

The interior of a refrigerator has a surface area of 4.8 m2. It is insulated by a 2.2 cm thick material that has a thermal conductivity of 0.0115 J/m · s · ◦ C. The ratio of the heat extracted from the interior to the work done

What does taking the derivative of a function tell you about the function? Is a derivative a local property in the sense that you can define the derivative of a function f(x) at x?

What does integrating a function tell you? Is an integral a local property in the sense that you can define the integral of a function f(x) at x?

If you first differentiate a function and then integrate it, are you going to get the same function back that you started with?

Find the magnetic field B inside of an infinite cylinder of radius R with uniform current density J

Your apparent weight is the force you feel on the bottoms of your feet when you are standing. Due to the Earth's rotation, your apparent weight is slightly more when you are at the South Pole than when you are at the equator. What is the ratio of your apparent weights at these two locations? Carry three significant figures in your calculation.

Derive the formula for the magnetic field of a solenoid using Ampere’s

law. Be sure to draw a diagram showing the solenoid, magnetic field and Amperean loop.

Explain how you use the loop to compute the enclosed current and circulation of the B field.

(On which sides is the dot product of B and dl zero, and why?)

A charge of -3.40 nC is placed at the origin of an xy-coordinate system, and a charge of 1.60 nC is placed on the y axis at y = 4.50 cm .

a-If a third charge, of 5.00 nC , is now placed at the point x = 3.15 cm , y = 4.50 cm find the x and y components of the total force exerted on this charge by the other two charges. ?

b-Find the magnitude of this force.

c-Find the direction of this force.

The time of flight of a ball thrown horizontally change if the initial velocity change? If it does why?

A fountain sends water to a height of 150 meters. What is the difference between the pressure of the water system and the atmospheric pressure?

When two objects collide, the impulse each delivers to the other is equal and opposite. But each object might experience a different acceleration. Calculate the acceleration of two objects in a given collision.

• How can you tell the difference between elastic and inelastic collisions? How would I set the first question up? Is there a specific equation I need to use?

How would I set it up? Do I need to first find the velocities of each object and then use those to find the acceleration of each?

1. A skier of mass 80 kg starts from rest and slides down a frictionless slope of length 35 m that is

inclined at an angle of 30 degrees with the horizontal. Ignore air resistance.

a. Calculate the work done by gravity on the skier, and the work done by the normal force

on the skier.

b. If the slope is not frictionless so that the skier has a final velocity of 25 m/s, calculate the

work done by gravity, the work done by the normal force, the work done by friction, the

force of friction, and the coefficient of kinetic friction.

A 1000-kg car rounds a curve on a flat road of radius 50 m at a speed of 50 km/h (14 m/s). Will the car follow the curve, or will it skid? Assume (a) the pavement is dry and s = 0.60; (b) the pavement is icy and s = 0.25