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).

A pendulum 2.10 m long is released (from rest) at an angle θ0=30.0∘.

B. Determine the speed of the 50.0 g bob at θ=15.0∘.

C.Determine the speed of the 50.0 g bob at θ=−15.0∘ (i.e., on the opposite side).

D.Determine the tension in the cord at the lowest point (θ=0).

E. Determine the tension in the cord at the θ=15∘.

F. Determine the tension in the cord at θ=−15.0∘.

You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was traveling eastward. Car B weighs 1125 lb and was traveling westward at 41.0 mph. The cars locked bumpers and slid eastward with their wheels locked for 18.5 ft before stopping. You have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . How fast (in miles per hour) was car A traveling just before the collision? (This problem uses English units because they would be used in a U.S. legal proceeding.)

1. An infinitely long solenoid of radius R carries n turns per unit length and current I and is oriented such that its axis is along the z direction. What direction must a particle of charge q be moving such that it feels zero force (a) inside the solenoid (b) outside the solenoid

2. Find the maximum magnetic flux through a circular coil of radius L such that L < R placed inside the solenoid of the previous problem.

On his way to class, a student on a skateboard is accelerating on a downhill stretch. Which of the following are true.

I know the answer is

a) the skateboarder is moving in the direction of the net force

b) the skateboarder is subjected to a net external force in the direction of motion

c) the skateboarders acceleration is in the direction of the net force

I am struggling to understand why all three of these answers are correct. Could you possibly explain to me why each of these is correct. I know it is in correlation with Newtons first law but i need further explanation to help understand it because it is not clicking in my head.

Thank you for your time!!

I already finish the argumentative topic about abortion, but my professor does not want me to write about it.

Can someone help me write 500 words about this argumentation "Education should be free for everyone".

A cart changes its speed from rest to 100 m/s in 1 s. During this interval its acceleration is