Required information A nozzle of inner radius 1.08 mm is connected to a hose of inner radius 9.20 mm. The nozzle shoots out water moving at 25.0 m/s. At what speed is the water in the hose moving? cm/s

Required information A nozzle of inner radius 1.08 mm is connected to a hose of inner radius 9.20 mm. The nozzle shoots out water moving at 25.0 m/s. What is the mass flow rate? g/s

Required information The volume flow rate of the water supplied by a well is 2.00 × 10−4 m3/s. The well is 37.0 m deep. The density of water is 1.00 × 103 kg/m3.Find the pressure difference the pump must maintain. kPa

Estimate the average blood pressure in a person’s foot if the foot is 1.46 m below the aorta, where the average blood pressure is 104 mmHg. For the purposes of this estimate, assume the blood isn’t flowing. The density of blood is 1060 kg/m3. mmHg

When a block of ebony is placed in ethanol, what percentage of its volume is submerged? The density of a block of ebony is between 1000 and 1300 kg/m3. The density of ethanol is 790 kg/m3. %

In your own words and not copied from the web please.

Optical fibers are made from glass or plastic and generally have an index of refraction of about 1.45. They are commonly used in telecommunications and computer networks.

Identify and describe a specific application for fiber optics? What kind of information can they transmit? What advantages do they have over other materials or technologies? Explain how optical fibers work and the role of total internal reflection of light within.

A parallel beam of light containing red (660 nm) and blue (470 nm) wavelengths goes from diamond to water, striking the surface between them at a 19° incident angle. What is the angle between the two colors in water?

Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect extremely weak signals. Suppose one radio telescope is sensitive enough to detect a signal which lays down only 1.3 pW of power on an area of 4.1 × 10¹³ m². (a) What would be the total power that would be received by the antenna, assuming that its diameter is 340 m? (b) What would be the power of a source at 22000 ly distance from Earth that could provide such a signal? A light-year is the distance light travels in one year.

Ball Collision. A ball with a mass of 0.600 kg is initially at rest. It is struck by a second ball having a mass of 0.400 kg, initially moving with a velocity of 0.250 m/s toward the right along the x-axis. After the collision, the 0.400 kg ball has a velocity of 0.200 m/s at an angle of 36.9° above the x axis in the first quadrant. Both balls move on a frictionless, horizontal surface. Find the magnitude of the velocity of the 0.600 kg ball after the collision. Find the direction of the velocity of the 0.600 kg ball after the collision. Find the change in total kinetic energy of the 0.400 kg ball that occurs as a result of the collision. Find the change in total kinetic energy of the 0.600 kg ball that occurs as a result of the collision.

1.The space shuttle is in a 250-km-high circular orbit. It needs to reach a 610-km-high circular orbit to catch the Hubble Space Telescope for repairs. The shuttle

Question 1-

In a bizarre way to test the speed of a clay ball shot from a slingshot, a wooden block is set up outside the lab on the concrete. The sticky clay ball has a mass of 10.0 g and is hurled perfectly horizontally by a man with his slingshot at a 90 g wooden block initially at rest on the concrete, a compete horizontal surface. The clay sticks to the block. After impact, the block slides 7.50 m before coming to rest. If the coefficient of friction between block and surface is 0.650, what was the speed of the clay (in m/s) immediately before impact?

m/s

Question 2-

In the sport of speed skating, the top athletes experience centripetal acceleration of approximately 0.65 g (meaning the centripetal force is about 65% of their weight). If the radius of the inner lane is about 22.6 meters, how fast are the skaters going?

m/s

Explain the following causes of color:

a. Why are rubies red? They are basically single crystals of Al2O3 with 1% of Cr impurities. Bulk Al2O3 has a band gap of 8.8 eV.

b. Contrast the different causes of color in chlorophyll, in Si and in the gemstone Al2O3.

Light from a helium-neon laser (?=633nm) is used to illuminate two narrow slits. The interference pattern is observed on a screen 3.1mbehind the slits. Thirteen bright fringes are seen, spanning a distance of 50mm .

What is the spacing (in mm) between the slits?

Express your answer using two significant figures

1. A 25 kg box is lifted upward at a constant rate of 2 m/s. If the box is lifted a height of 4 m, how much work is done on the box?

2. A 120 kg box is attached to a string and pulled along a rough, flat surface with a coefficient of friction 0.22. If the string pulls with a force of 500 N and is attached at an angle of 30 degrees above the horizontal, and the box moves strictly horizontally a distance of 5 m.

How much work is done on the box by pulling on the string?

3.

A 120 kg box is attached to a string and pulled along a rough, flat surface with a coefficient of friction 0.22. If the string pulls with a force of 500 N and is attached at an angle of 30 degrees above the horizontal, and the box moves strictly horizontally a distance of 5 m.

How much work is done on the box by gravity?

4.

A 120 kg box is attached to a string and pulled along a rough, flat surface with a coefficient of friction 0.22. If the string pulls with a force of 500 N and is attached at an angle of 30 degrees above the horizontal, and the box moves strictly horizontally a distance of 5 m.

How much work is done on the box by friction?

4.

A 120 kg box is attached to a string and pulled along a rough, flat surface with a coefficient of friction 0.22. If the string pulls with a force of 500 N and is attached at an angle of 30 degrees above the horizontal, and the box moves strictly horizontally a distance of 5 m.

How much work is done on the box by friction?

4.

A 120 kg box is attached to a string and pulled along a rough, flat surface with a coefficient of friction 0.22. If the string pulls with a force of 500 N and is attached at an angle of 30 degrees above the horizontal, and the box moves strictly horizontally a distance of 5 m.

How much work is done on the box by friction?

A 120 kg box is attached to a string and pulled along a rough, flat surface with a coefficient of friction 0.22. If the string pulls with a force of 500 N and is attached at an angle of 30 degrees above the horizontal, and the box moves strictly horizontally a distance of 5 m.

How much work is done on the box by friction?

A 120 kg box is attached to a string and pulled along a rough, flat surface with a coefficient of friction 0.22. If the string pulls with a force of 500 N and is attached at an angle of 30 degrees above the horizontal, and the box moves strictly horizontally a distance of 5 m.

How much work is done on the box by friction?

A 120 kg box is attached to a string and pulled along a rough, flat surface with a coefficient of friction 0.22. If the string pulls with a force of 500 N and is attached at an angle of 30 degrees above the horizontal, and the box moves strictly horizontally a distance of 5 m.

How much work is done on the box by friction?

4. A 120 kg box is attached to a string and pulled along a rough, flat surface with a coefficient of friction 0.22. If the string pulls with a force of 500 N and is attached at an angle of 30 degrees above the horizontal, and the box moves strictly horizontally a distance of 5 m.

How much work is done on the box by friction?

5. In  the previous problem concerning the work done by friction. The work done by friction would be negative as it is removing energy from the system and working to slow the motion. True or False?

6. In the previous problems, the Normal force opposes gravity and prevents the object from falling through the surface it is sliding across. The work done by the normal force in this case is negative as it is stopping the motion in the vertical direction. True or False?

1) What is the current through and voltage across a capacitor after it is fully charged in a DC circuit?

a) I=0, V=0

b) I=0, V=max

c) I=max, V=0

d) I=max, V=max

2) What is the current through and voltage across a capacitor after it is fully discharged?

a) I=0, V=0

b) I=0, V=max

c) I=max, V=0

d) I=max, V=max

An object with mass m = 0.6 kg is dropped from the top of the building and falls 21 m down in front of the cafe.

1.1 Calculate the speed of the object as it hits the ground and calculate the time for the fall. Neglect in this question the air resistance.

In a more accurate calculation we need to take air resistance into account. In a wind tunnel the air resistance of the object has been measured giving rise to an acceleration of: a_air = 0.03v² where v is the speed of the object.

1.2 Now, taking air resistance into account, find the speed of the object as it hits the ground. Any integrals in your calculation should be calculated by hand!

1.3 Calculate the time of the fall when air resistance is taken into account. (You are allowed to use calculator to calculate occurring integrals when answering this question!)

Consider the air tracks from lab: A car of mass m is set in motion with constant speed. As it moves down the track a mass of 2m is dropped onto the car without causing any damage. The car and additional load continue along the track. How does kinetic energy of the car + load compare to the original kinetic energy of the car?

1) The kinetic energy is 3 times the original kinetic energy

2) The kinetic energy is equal to the original kinetic energy    

3) The kinetic energy is 1/2 times the original kinetic energy

4) The kinetic energy is 1/3 times the original kinetic energy

5) The kinetic energy is 2 times the original kinetic energy

Question 54 1 pts What happens to a given mass of water as it is cooled from 4°C to zero? it contracts it expands it vaporizes none of the above Flag this Question Question 55 1 pts A gasoline engine operates between a high temperature TH = 127oC a low temperature TC = 27o C. If this engine operates with Carnot efficiency, its efficiency is closest to 10% 25% 33% 79%