1)A circular loop of wire lies within the horizontal plane, and you are viewing it from above. You hold a magnet above the loop, with its north pole up and south pole down, and you drop the magnet. In what rotational direction will you see the induced current in the loop flow? (clockwise-counterclockwise)

2)The current going through a capacitor is called a (conduction current/displacement current)and arises from changing (electric field/magnetic field)

3) semiconductors are (diamagnetic/ferromagnetic/paramagnetic) materials

4) A circular loop of wire lies within the xy plane. It has an area of LaTeX: 1\:m^21 m 2 and an overall resistance of 4 Ohms. A uniform magnetic field runs in the positive z direction, and its magnitude increases at a rate of 2 T/s. What is the induced current?

A hollow ball of diameter D is suspended from a string of negligible mass whose length is equal to the ball’s diameter. The string is attached to the surface of the ball.

Find an expression for the period of this physical pendulum in the small-amplitude approximation.

A cosmic ray proton streaks through the lab with velocity 0.82c at an angle of 52° with the +x direction (in the xy plane of the lab). Compute the magnitude and direction of the proton's velocity when viewed from frame S' moving with β = 0.74.

Very short pulses of high-intensity laser beams are used to repair detached portions of the retina of the eye. The brief pulses of energy absorbed by the retina weld the detached portion back into place. In one such procedure, a laser beam has a wavelength of 810 nm and delivers 255 mW of power spread over a circular spot 163 μm in diameter. The vitreous humor (the transparent fluid that fills most of the eye) has an index of refraction of 1.34.

Part A: If the laser pulses are each 1.30 ms long, how much energy is delivered to the retina with each pulse Express your answer in millijoules to three significant figures.

Part B: What average pressure does the pulse of the laser beam exert on the retina as it is fully absorbed by the circular spot? Express your answer in Pascals to three significant figures.

Part C: What is the wavelength of the laser light inside the vitreous humor of the eye? Express your answer in nanometers to three significant figures.

Part D: What is the frequency of the laser light inside the vitreous humor of the eye? Express your answer in Hertz to three significant figures.

Part E: What is the maximum value of the electric field in the laser beam? Express your answer in volts per meter to three significant figures.

Part F: What is the maximum value of the magnetic field in the laser beam? Express your answer in teslas to three significant figures.

Your job with NASA is to monitor satellite orbits. One day, during a routine survey, you find that a 400 kg satellite in a 1000-km-high circular orbit is going to collide with a smaller 100 kg satellite traveling in the same orbit but in the opposite direction. Knowing the construction of the two satellites, you expect they will become enmeshed into a single piece of space debris. When you notify your boss of this impending collision, he asks you to quickly determine whether the space debris will continue to orbit or crash into the earth. Do you think the debris will orbit or crash into the earth? Explain your reasoning.

1. Three plane mirrors intersect at right angles. A beam of laser light strikes the first of them at an angle ? with respect to the normal

a)Show that when this ray is reflected off of the other two mirrors and crosses the original ray, the angle ? between these two rays will be ?=180?? 2?.

b)For what angle ? will the two rays be perpendicular when they cross?

2.A ray of light in diamond (index of refraction 2.42) is incident on an interface with water.

a)What is the largest angle the incident ray can make with the normal in diamond and not be totally reflected back into the diamond?

Respond to the following in a minimum of 175 words:

• The world's population grows each year. Does this mean that the mass of Earth increases each year? How old are atoms? Explain your answer with an example.

PLEASE TYPE RESPONSE DO NOT HAND WRITE!!

A mass, m=1.4 kg of negligible size, is attached at the end of a uniform rod of length L= 0.99 mm which has mass M= 1.9 kg . What is the moment of inertia of this arrangement if it is to rotate at an axis located at a distance 0.39*L from the end of the rod opposite to the mass, m? (At approximately the point marked with an 'X'.)

Calculate the moment of inertia of the rod-mass system given that the moment of inertia of a rod about the center of mass is I=(1/12)* M*L^2

A rod of mass "10m" and length "L" is hanging through a pivot at one end. A lump of clay of mass "m" is thrown perpendicular to the rod hitting it at the opposite end of the pivot. The lump sticks to the rod causing the rod to swing in a vertical circle up to an angle of 90^o. Given [m, L] Determine:

a. The initial speed of the lump of clay.

b. The angular speed of the system just after the collision.

Two blocks are free to slide along a frictionless, wooden track. The track consists of a curve of height 4.91 m that falls to a straightaway. A smaller block weighing 4.91 kg is allowed to fall from the top the curve. It has a spring pointed forward embedded at the front. After reaching the straightaway, it collides with a larger block weighing 12 kg that is hard and flat at its rear. The two blocks rebound elastically. What is the final speed of the larger block?

Explain laws of refraction with bending of light from denser to rarer medium and the reverse? How you can find equation 1n1= 2n2? What is Snell’s law?

A scientific analysis of Jurassic park (first one)

Discuss what was scientifically correct and incorrect. Do you think that the scientifically incorrect part was done out ignorance of the laws of physics/principles of geology or do you think that it was a simple plot device? Why do you think that the creators of these works routinely break the laws of physics/principles of geology? How do you think this affects the public's understanding of science?

at least 3 correct things and at least 4 incorrect things

Calculate the tidal force on a 75 kg person 2 meter height falling into a solar mass black hole just as they cross the event horizon. Compare that to the force of Earth's gravity on that same person (given by their mass multiplied by 9.8).