Using words, explain the laws of physics behind this in a paragraph. Don't just write equations with few words.

Here is the video: https://www.youtube.com/watch?v=8B_6BU7SYf8

The Horo was used by the Ancient Japanese to deflect arrows from enemies. Explain how such silk could stop the arrows. The video itself explains it little but please expand on that more and use equations/formulas (like perhaps one for KE) to aid the explanation.

Describe the physics of an electric generator with relevant equations ?

1. For what kinetic energy is the de Broglie wavelength of an electron equal to its Compton wavelength? Express your answer in units of mc2 in doing the calculation, and then use mc2 = 0.5 MeV.(Answer: 0.2 MeV)

2. A beam of electrons with energy 1.0 eV approaches a potential barrier with U = 2.0 eV, whose width is 0.10 nm (see a figure below). Estimate the fraction of electrons that tunnel through the barrier. (Hint: use the relation of probability and the wave function, and the expression for wave function for barrier penetration)

3. Calculate the Fermi energy of sodium (n= 2.65·10^28 m^-3). This metal has a single valence electron per atom.(Answer: 3.25 eV.)

Make a list of all the possible sets of quantum numbers that an electron in an atom can have if n = 4. How many different states with n = 4 are there? Indicate on your list which states are degenerate (i.e. have the same energy as other n = 4 states). Assume that the electron is in a multi-electron atom (i.e. not the Hydrogen atom). Does the total number of states agree with the general rule that the number of states is equal to 2n^2.

You sign up for a bungee jump off a tall bridge. A thick rope with a fixed length of 18.0 m is tied to the bridge, and a bungee cord with an unstretched length of 11.0 m is then connected to the rope. The other end of the bungee cord is attached to your legs.

You step off the bridge, falling from rest. The bungee cord does not start exerting any force on you until you have fallen a distance of 29.0 m (the sum of the rope's length and the unstretched length of the bungee cord). After that, it exerts an upward force on you that eventually brings you to rest, for an instant. Assume the bungee cord, when stretched, acts like an ideal spring, and take g = 10 N/kg, to make the calculations easier. Your mass is 50.0 kg.

You fall a total distance of 54.0 m before coming instantaneously to rest. Determine the spring constant of the bungee cord.
_______ N/m

Part (b)

You sign up for a bungee jump off a tall bridge. A thick rope with a fixed length of 18.0 m is tied to the bridge, and a bungee cord with an unstretched length of 11.0 m is then connected to the rope. The other end of the bungee cord is attached to your legs.

You step off the bridge, falling from rest. The bungee cord does not start exerting any force on you until you have fallen a distance of 29.0 m (the sum of the rope's length and the unstretched length of the bungee cord). After that, it exerts an upward force on you that eventually brings you to rest, for an instant. Assume the bungee cord, when stretched, acts like an ideal spring, and take g = 10 N/kg, to make the calculations easier. Your mass is 50.0 kg.

You fall a total distance of 54.0 m before coming instantaneously to rest, but how far below the bridge are you when you reach maximum speed?
_______ m

Part (c)

You sign up for a bungee jump off a tall bridge. A thick rope with a fixed length of 18.0 m is tied to the bridge, and a bungee cord with an unstretched length of 11.0 m is then connected to the rope. The other end of the bungee cord is attached to your legs.

You step off the bridge, falling from rest. The bungee cord does not start exerting any force on you until you have fallen a distance of 29.0 m (the sum of the rope's length and the unstretched length of the bungee cord). After that, it exerts an upward force on you that eventually brings you to rest, for an instant. Assume the bungee cord, when stretched, acts like an ideal spring, and take g = 10 N/kg, to make the calculations easier. Your mass is 50.0 kg.

You fall a total distance of 54.0 m before coming instantaneously to rest. Calculate the maximum speed you reach during the fall.
_______ m/s

Describe the source of distortion and the means of correction in terms of the wave model of light and wave optics. Be sure to use the terms ray, wave, reflection, refraction and focal point in your response.

differentiate between conduction convection and radiation as a means of transportation of energy state the equation for each and explain each symbol used

How much energy is required to accelerate a spaceship with a rest mass of 107 metric tons to a speed of 0.458 c?

Every day our Earth receives 1.55×10²² J energy from the Sun. If we were able to use 0.85 percent of this energy to accelerate spaceships, then how many missions would be possible in one year?

A solenoid having an inductance of 9.13 μH is connected in series with a 1.62 kΩ resistor. (a) If a 16.0 V battery is connected across the pair, how long will it take in seconds for the current through the resistor to reach 82.8% of its final value? (b) What is the current through the resistor at a time t = 1.00τL?

While taking a shower, you notice that the shower head is made up of 36 small round openings, each with a radius of 1.4 mm. You also determine that it takes 7.0 s for the shower to completely fill a 1- liter container you hold in the water stream. The water in your house is pumped by a pump in the basement, 6.2 m below the level of the shower head. The pump maintains an absolute pressure of 1.6 atmospheres. Neglect viscosity. Use g = 9.8 m/s/s, and 1 atmosphere = 101,300 Pa.

[1 point] (a) What is the total area of the openings in the shower head?

[2 points] (b) At what speed is the water emerging from the holes?

cconnected to the pump (assume it has a constant cross-sectional area)?

[2 points] (c) At what speed is the water flowing through the pipe

[2 points] (d) What is the radius of the pipe?

[1 point] (e) If you covered up six of the holes in the shower head with your thumb, with what speed would you expect the water to emerge from the remaining holes?

1. Describe a scenario where two objects are electrically attracted to one another, but one of the objects is neutral in charge

2. What would happen if the force of gravity was stronger than the electrical force between two charges in space?

A bat flying at 4.80 m/s is chasing an insect flying in the same direction. The bat emits a 40.0-kHz chirp and receives back an echo at 40.4 kHz. (Take the speed of sound in air to be 340 m/s.)

What is speed of insect (m/s)

Problem 9: Suppose that a 115 kg football player running at 5.5 m/s catches a 0.47 kg ball moving at a speed of 25.5 m/s with his feet off the ground, while both of them are moving horizontally.

Part (a) Calculate the final speed of the player, in meters per second, if the ball and player are initially moving in the same direction. Numeric : A numeric value is expected and not an expression. vf,1 = __________________________________________

Part (b) Calculate the change in kinetic energy of the system, in joules, after the player catches the ball. Numeric : A numeric value is expected and not an expression. ΔKE1 = __________________________________________

Part (c) Calculate the final speed of the player, in meters per second, if the ball and player are initially moving in opposite directions. Numeric : A numeric value is expected and not an expression. vf,2 = __________________________________________

Part (d) Calculate the change in kinetic energy of the system, in joules, in this case. Numeric : A numeric value is expected and not an expression. ΔKE2 = __________________________________________

A sheet of glass (n=1.50) is coated with a 500 nm -thick layer of oil (n=1.42).

A. For what visible wavelengths of light do the reflected waves interfere constructively? The range of wavelength of visible light is from 380 nm to 750 nm.

B. For what visible wavelengths of light do the reflected waves interfere destructively?

C. What is the color of reflected light?

D. What is the color of transmitted light?

A rock is suspended by a light string. When the rock is in air, the tension in the string is 52.9 N . When the rock is totally immersed in water, the tension is 32.6 N . When the rock is totally immersed in an unknown liquid, the tension is 14.4 N .

What is the density of the unknown liquid?