I need proper answers for the following ( well explained and understandable writing)

1) A hollow copper tube carries a current along its length. Why is B =0 inside the tube? Is B nonzero outside the tube?

2)  Why does hitting a magnet with a hammer cause the magnetism to be reduced

Enter the letters corresponding to all the true statements.

1. At a certain location there is a constant horizontal magnetic field pointing to the east. A square loop of wire is placed in this field. At time A the bottom of the loop is resting on the floor (which is insulating), and the plane of the square loop is vertical and perpendicular to the magnetic field. The loop tips over and at time B it is flat on the floor. For this situation...

A) The induced current is greatest just before the loop starts to tip
     B) While the loop is tipping over, the induced current is flowing northward through the bottom side of the square
     C) The magnetic flux does not change as a result of the loop tipping over
     D) Current is induced to flow in the loop because the magnetic flux is changing
     E) Before the loop starts to tip over, there is no induced current in the square loop

2. Electromagnetic waves are traveling straight down towards the center of the earth. For these waves...

     A) if the electric field points east, the associated magnetic field points north
     B) if the electric field points north, the associated magnetic field points east
     C) a high-frequency wave has a shorter wavelength than a low-frequency wave
     D) green light has a higher frequency than blue light
     E) visible light has a longer wavelength than ultraviolet light

A 150-g baseball is dropped from a tree 13.0 mabove the ground.

A) With what speed would it hit the ground if air resistance could be ignored?

B) If it actually hits the ground with a speed of 9.00 m/s , what is the magnitude of the average force of air resistance exerted on it?

A 178g block is launched by compressing a spring of constant k=200N/m a distance of 15 cm. The spring is mounted horizontally, and the surface directly under it is frictionless. But beyond the equilibrium position of the spring end, the surface has coefficient of friction ?=0.27. This frictional surface extends 85 cm, followed by a frictionless curved rise

After launch, where does the block finally come to rest? Measure from the left end of the frictional zone.

Please show ur working

A metal bar (23.5 x 10^-6oC^-1) has a final length of 5.5800 m after its temperature changes from 64.459 ^oF to -27.674 ^oC.

a) Convert the initial temperature to ^oC.

  In 100 words or less, explain how to calibrate a new and otherwise unmarked mercury or alcohol filled, glass thermometer.

As a city planner, you receive complaints from local residents about the safety of nearby roads and streets. One complaint concerns a stop sign at the corner of Pine Street and 1st Street. Residents complain that the speed limit in the area (55 mph) is too high to allow vehicles to stop in time. Under normal conditions this is not a problem, but when fog rolls in visibility can reduce to only 155 ft. Since fog is a common occurrence in this region, you decide to investigate. The state highway department states that the effective coefficient of friction between a rolling wheel and asphalt ranges between 0.842 and 0.941, whereas the effective coefficient of friction between a skidding (locked) wheel and asphalt ranges between 0.550 and 0.754. Vehicles of all types travel on the road, from small VW bugs weighing 1070 lb to large trucks weighing 8070 lb. Considering that some drivers will brake properly when slowing down and others will skid to stop, calculate the minimum and maximum braking distance needed to ensure that all vehicles traveling at the posted speed limit can stop before reaching the intersection

. minimum braking distance: ft ? maximum braking distance: ft?

Given that the goal is to allow all vehicles to come safely to a stop before reaching the intersection, calculate the maximum desired speed limit. maximum speed limit: mph?

A box of mass m = 10.0 kg is attached to a rope. The other end of the rope is wrapped around a pulley with a radius of 15.0 cm. When you release the box, it begins to fall and the rope around the pulley begins to unwind, causing the pulley to rotate. As the box falls, the rope does not slip as it unwinds from the pulley. If the box is traveling at a speed of 2.50 m/s after it has fallen 0.500 m, what is the moment of inertia of the pulley?

Two charges — q1 = 2.1 × 10-6C, q2 = 5.4 × 10-6C — are separated by a distance of d = 3.75 m.

At what distance, r in meters, from the first charge is the electric field zero?

Starting from the basic definition of moment of inertia (eq 9.15), evaluate by integration the rotational inertia of a 50-lb hollow cylinder flywheel about the cylinder axis, whose outer diameter is 16-in and inner diameter is 15-in?

Find the momentum space wavefunction of A/(x^2+a^2).

I need detailed, step-by-step explanation.

1. As a demonstration of lab safety violations, a stainless steel water bottle is filled with a small amount of liquid nitrogen, and then the cap is sealed on the bottle (don’t ever do this – you could get seriously hurt). The bottle is laid on its side on the edge of the roof of the library building, which is 14 meters above the street below. When the bottle explodes, the 240 gram bottle flies back onto the roof and you measure its initial velocity to be 6.1 m/s. You can clearly see this velocity is initially completely horizontal. The 20.0 gram cap flies off the roof also with an initial velocity that is completely horizontal. How far away from the edge of the building does the cap land? You can assume air resistance is negligible.

2. You get a summer job testing springs at a manufacturing plant. Every 50th spring is taken off the line and is pushed with a force sensor a certain distance to make sure the spring constant is within specifications. The force sensor quits working. You devise a method using a flat track to push a 500 gram calibration mass along the track and then up a ramp angled at 20°. You cover the ramp and track with lubrication to make it nearly frictionless, but run out before you can coat the entire thing, leaving a 25 cm length on the flat part of the track with friction. Using a spring with a known spring constant of 150 N/m, you compress the spring 10 cm with the mass. You release the mass and measure it to go 23.0 cm along the angled part of the ramp when it stops. (a) What is the coefficient of friction of the patch left unlubricated? (b) If the springs you are currently manufacturing are supposed to be 400 N/m constants and you compress it 5 cm with the calibration mass, how far along the angled ramp should the calibration mass slide, assuming the friction is still present?

3. You set up a small ramp in your house to do some physics experiments. It is a smooth metal sheet and you are using an ice cube as a way to slide without friction. Your sheet is 1.42 meters long and you prop it up at an angle of 27°. You make a large ice cube of 250 grams for your experiment. a. If you allow the ice cube to slide from the top of the ramp, how fast is it going at the bottom? b. If the ice cube falls off the top of the ramp over the edge (instead of sliding down the ramp), how fast is it going when it hits the ground? c. If you wanted to slide the cube from the bottom of the ramp to the top, how much work would you do pushing it, assuming the speed at the bottom of the ramp and top of the ramp is zero? d. How much work does gravity do during the push from part (c)?

A space station shaped like a giant wheel has a radius of 1.00 x 102 m and a moment of inertia of 5.00 x 108 kgm2. A crew of 150 lives on the rim, and the station is rotating so that the crew experiences an apparent acceleration of 1.0g. When 120 people move to the center of the station for a union meeting, the angular speed changes. What apparent acceleration is experienced by the mangers remaining at the rim? Assume the average mass of a crew member is 65.0 kg.

Please show ALL work

A ball of mass 0.576 kg moving east (+x+x direction) with a speed of 3.78 m/sm/s collides head-on with a 0.288 kg ball at rest. Assume that the collision is perfectly elastic

What is be the speed of the 0.576-kg ball after the collision?

What is be the direction of the velocity of the 0.576-kg ball after the collision?

What is the speed of the 0.288-kg ball after the collision?

What is the direction of the velocity of 0.288-kg ball after the collision?

30 grams of ice at -5 Celsius melt while being left at room temperature of 28 Celsius. After melting its temperature rises to 28 Celsius. Determine the total change of entropy of the environment.

[Cice = .5 cal/g.C, Lf = 79.6 cal/gram] 1 calorie = 4.184 J