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?

A force of 60 lbs make an angle of 45° with the horizontal. Find its vertical and horizontal components. Draw the figure.

Which of the following statements are true? Choose all that apply.

1.The length of a microscope is greater than the sum of the focal lengths of the eyepiece & objective.

2.The purpose of a large primary mirror in a telescope is to have a large magnification.

3.Better resolution is achieved with larger wavelengths.

4. Far-sighted people use converging lenses to correct their vision.

5. Nearsighted people see close up objects in focus.

6. For a telescope, the smaller f_e is, the greater the magnification.

Write 250 words.

Question: Theory -- Here, provide the relevant theoretical background including all formulas needed for the analysis. Make sure you define the different quantities and symbols that you have used in your report.

lab:

http://phys205r1.athabascau.ca/lab-manual/phys205-lab-exp4.html

Interstellar cloud having a diameter of 10¹³ km and a rotation period of 10⁶ years collaps- ing to a sphere the size of the Sun (1.4 x 10⁶ km in diameter). We point out that if all the cloud’s angular momentum went into that sphere, the sphere would have a rotation period of only 0.6 second. Do the calculation to confirm this result.

A 200 g insulated aluminum cup at 16 ∘C is filled with 255 g of water at 100 ∘C

a) Determine the final temperature of the mixture.

b)  Determine the total change in entropy as a result of the mixing process (use ΔS=∫dQ/T).