1 Write down the expressions for centripetal force and angular momentum

2 What are the units of moment of inertia?

3 In Fig.1 show that the tension, T, in the string causing the pulley to rotate is given by

T = m(g-a)

where a is the linear acceleration of the falling mass.

4 In part III, what factors could cause the angular momentum not to be conserved?

A fan is designed to last for a certain time before it will have to be replaced (planned obsolescence). The fan only has one speed (at a maximum of 675 rpm), and it reaches the speed in 3.0 s (starting from rest). It takes the fan 7.0 s for the blade to stop once it is turned off. The manufacturer specifies that the fan will operate up to 1 billion rotations.

Andre lives in a hot climate, works outside of the home from approximately 8:00 am to 5:00 pm, Monday through Friday, does not own an air conditioner, and can't sleep with the fan running. Estimate how many hot days ? hot Andre will be able to use the fan, rounded to the nearest day.

N hot = ? days

1. A contact lens and a sewing needle are pretty much the same weight. Why is one of these a lot more comfortable resting on your eye? Ah! ?? (everyday life)

2. Write what you remember about Pascal's principle without reading anything. Now go see how right you are!

3. How many 1/4 pound burgers do we need to stack on a table that is 1 meter by 1 meter to be the equivalent of 1 atmosphere? How many starving pygmy vampire bats would this feed for a light year?

4. A pipe contains an incompressible fluid. At some point along its path the pipe doubles in diameter. How does this affect the velocity of the fluid inside?

5. Picture of a cubic meter of water. How much do you think it weighs? Find the density of water then find the mass of a cubic meter of water and then multiply by gravity to see how close you were!

6. Do the same thing for a backpack of gold.

7. Which direction does a buoyant force point?

8. Compare the buoyant force and the weight for an object that sinks and floats.

9. What does the buoyant force for a submerged object depend on?

TYPE with KEYBOARD, please

What is the purpose of Conservation of linear momentum experiment?

And what is the theory of Conservation of linear momentum experiment? Write a paragraph on elastic and inelastic collision. Include related equations as well

2 identical speakers are in phase with eachother, at the same position on the x-axis, and both have a wavelength of 3 meters. They are seperated from eachother on the y-axis by a distance of 6 meters. While an observer maintains a constant position on the y-axis, determine the locations on the x-axis where the observer could relocate theirself where the sound intensity is at a minimum. The provided answers are 11.25 meters and 1.75 meters; however, I am unsure how to actually solve this problem. This is from the interference and diffraction chapter of my optics and thermodynamics course.

A locomotive is accelerating at 1.6 m/s2 as it passes through a 30-m-wide crossing. After the locomotive leaves the crossing, how much time is required until its speed reaches 40?

A proton has an initial speed of 4.02E+5 m/s. What potential difference is required to bring the proton to rest?

What potential difference is required to reduce the initial speed of the proton by a factor of 3?

What potential difference is required to reduce the initial kinetic energy of the proton by a factor of 3?

(a) What is the magnitude of the tangential acceleration of a bug on the rim of an 11.5-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 77.0 rev/min in 3.50 s?

(b) When the disk is at its final speed, what is the magnitude of the tangential velocity of the bug?

(c) One second after the bug starts from rest, what is the magnitude of its tangential acceleration?

(d) One second after the bug starts from rest, what is the magnitude of its centripetal acceleration?

(e) One second after the bug starts from rest, what is its total acceleration? (Take the positive direction to be in the direction of motion.)

A 5.0 kg mass is initially at rest on a horizontal frictionless surface when a horizontal force along an x axis is applied to the block. The force is given by ? ⃗(?) = (6.0?2 − 2?3)?̂, where the force in in newtons, x is in meters, and the initial position of the block is x = 0. (a) What is the work done in moving the block from x = 1.0 m to x = 3.0 m? (b) What is the maximum kinetic energy of the block between x = 0.0 m and x = 3.0 m? (15 points)

A three-legged wooden bar stool made out of solid Douglas fir (the Young's modulus is 1.0×1010N/m2) has legs that are 2.0 cm in diameter.

When a 85 kg man sits on the stool, by what percent does the length of the legs decrease? Assume, for simplicity, that the stool's legs are vertical and that each bears the same load.

Express your answer in percent.

A 500 kg elevator accelerates upward at 1.9 m/s2 for 20 m, starting from rest.

a) How much work does gravity do on the elevator?

b) How much work does the tension in the elevator cable do on the elevator?

c) What is the elevator’s kinetic energy after traveling 20 m?

Describe how a generator is used to provide electrical energy. Where does that energy come from?

A 3.9 kg ball swings from a string in a vertical circle such that it has constant mechanical energy. Ignore any friction from the air or in the string. What is the difference in the tension between the lowest and highest points on the circle? Give a positive answer in N.

`DIRECTIONS: Write an answer to each question legible, using complete sentences and your own words as much as possible.

6.           What information is needed to directly determine the range of a projectile without using the equations of uniformly accelerated motion?

7.           At what point in its motion does an ideal projectile stop accelerating?

8.           Do two projectiles launched at complementary angles always yield the same range? Explain.

9.           When someone says that all measurement of motion is relative, what is it relative to? Give an example.

10.        Real projectiles do not have a maximum range for a 45^o launch. Discuss why the ideal angle for real projectiles (like baseballs, golf balls,..) is slightly lower than 45^o.

1. The electric potential inside a conductor in equilibrium is (constant or zero?) 2. How would you check whether an electrode is perfectly conductive?