A magnet slid down the inclined aluminum ramp with a constant velocity, rather than accelerating. Alluminum is not a magnetic material so there should be no magnetic attraction between the magnet and the aluminum. Explain the process that caused this to happen.

Points will be awarded yo answer with most detail and examples.

(a) Two 58 g ice cubes are dropped into 380 g of water in a thermally insulated container. If the water is initially at 22°C, and the ice comes directly from a freezer at -16°C, what is the final temperature at thermal equilibrium? (b) What is the final temperature if only one ice cube is used? The specific heat of water is 4186 J/kg·K. The specific heat of ice is 2220 J/kg·K. The latent heat of fusion is 333 kJ/kg.

A solid disk has a total kinetic energy K. What is its rotational kinetic energy Krot if it's rolling without slipping?

A sheet of glass is coated with a 505-nm-thick layer of oil (n = 1.42).

PART I:

For what visible wavelengths of light do the reflected waves interfere constructively?
Express your answer numerically. If there is more than one answer, enter your answers in ascending order separated by commas.

λ =______nm

PART II:

For what visible wavelengths of light do the reflected waves interfere destructively?
Express your answer numerically. If there is more than one answer, enter your answers in ascending order separated by commas.
λ =______nm

PART III
What is the color of reflected light?
A. Green-Blue
B Orange
C Yellow
D Red
PART IV:
What is the color of the most part of transmitted light?
A. Yellowish green
B. Orange
C, Blue
D. Red

A sinusoidal voltage Δv = 42.5 sin(100t), where Δv is in volts and t is in seconds, is applied to a series RLC circuit with L = 180 mH, C = 99.0 µF, and R = 51.0 Ω.

(a) What is the impedance (in Ω) of the circuit?   Ω

(b) What is the maximum current (in A)? A

(c) Determine the numerical value for  ω (in rad/s) in the equation i = I_max sin(ωt − ϕ). rad/s

(d) Determine the numerical value for ϕ (in rad) in the equation i = I_max sin(ωt − ϕ).   rad

(e) What If? For what value of the inductance (in H) in the circuit would the current lag the voltage by the same angle ϕ as that found in part (d)? H

(f) What would be the maximum current (in A) in the circuit in this case? A

IV. More practice with momentum and collisions A. A skater of mass 45.0 kg standing on ice throws a stone of mass 7.65 kg with a speed of 20.9 m/s in a horizontal direction. Find: 1. The speed of the skater after throwing the stone. 2. The distance over which the skater will move in the opposite direction if the coefficient of kinetic friction between his skates and the ice is 0.03. Include an energy bar chart in your solution. B. A tall man walking at 1.25 m/s accidentally bumps his head of mass 2.95 kg on a steel doorframe. His head stops in 0.011 s. 1. What is the magnitude of the average force exerted by the doorframe on the man's head? 2. Explain why putting padding on the doorframe would help reduce this force.

This glass had a circular base, radius 2cm and height was 10cm. The opposite base, the opened one where you drink from, was an ellipse having half axes 3cm and 4cm. The intermediate section were ellipse changing smoothly from the circular elliptic shape: any section is an ellipse.

The trick of the balancing fork is mentioned on many web sites. A good one is the one from Harvard University.

Explain the physics behind the balancing Forks in your own words.

Use the words torque, net torque, distance, and pivot in your explanation.

Describe how a pendulum and a mass on a horizontal spring satisfy those conditions (ignore any friction forces); also, include another example of a system that undergoes simple harmonic motion and discuss how it satisfies the conditions mentioned above.

Let's assume that there was some mechanism by which we could remain suspended in air. By this I mean that our feet is not in contact with the ground. One possible way of doing this would be by means of a jetpack. If we could remain suspended in air for a while in this manner, will we be in a different place when we come down, due to the Earth's rotation? When I thought of this problem in the micro scale using a ball (which rotates), it appears like I'll be in a different place when I come down from my suspended state. Am I overlooking something here?

If one were to use a different battery, would the capacitance of a capacitor change?

350 nm of light falls on a single slit of width 0.20 mm. What is the angular width of the central diffraction peak?

In a single slit diffraction experiment, if the width of the slit increases, what happens to the width of the central maximum on a screen?

In a double slit experiment, if the separation between the slits increases, what happens to the distance between the interference fringes?

Which of the following colors produces the widest diffraction pattern

1. At what altitude above the Earth’s surface is the acceleration due

to gravity equal to g/6?

2. Derive the escape speed for an object launched from the earth.

3. Calculate the escape speed for an object launched from

   a) the Earth.

   b) the moon.

4. •• Show that the speed of a satellite in a circular orbit a height h above the surface of the Earth is

(a) A constant force < 31, -13, 36 > N acts through a displacement < 0.17, 0.34, -0.24 > m. How much work does this force do?
Work =           ?J

(b) An object with mass 7 kg moves from a location < 28, 28, -43 > m near the Earth's surface to location < -34, 16, 45 > m. What is the change in the potential energy of the system consisting of the object plus the Earth?
Change of potential energy =     ?J

(c) A spring whose stiffness is 900 N/m has a relaxed length of 0.59. If the length of the spring changes from 0.48 m to 0.86 m, what is the change in the potential energy of the spring?
Change of potential energy =      ?J

(d) You observe someone pulling a block of mass 33 kg across a low-friction surface. While they pull a distance of 6 m in the direction of motion, the speed of the block changes from 3 m/s to 5 m/s. Calculate the magnitude of the force exerted by the person on the block.
F =     ?N

(e) What was the change in internal energy (chemical energy plus thermal energy) of the person pulling the block?
Change in internal energy =     ?J

Magnetism

What types of poles are there and how do they interact?

Explain three situations in which a magnetic force will interact. (hint: two poles, current carrying wire, moving

charge)

What affects the induced current of a coil in a magnetic field?