(1) Suppose that a runner on a straight track covers a distance of 1 mile in exactly 4min. what was its average velocity in

(i) mih-1 (iii) cms-1

(ii) fts-1 (iv) kmh-1

 

(2) A projectile is shoot at an angle of 60o to the horizontal with an initial speed of 225ms-1.

 

Determine the time of flight horizontal range and maximum height attained by the projectile. (take g = 9.8ms-2)

 

 

(3a) A bullet of mass 10g traveling horizontal at a speed of 100 ms-1 embeds itself in a block of woods mass 990g suspended by a string so that it can swing freely.

 

Find the vertical height through which block rises.

 

(bi) Explain with diagram the variation of the acceleration due to gravity (g) as one more.

 

· At a height h above the earth surface

· Inside the earth towards the centre of the earth. What is the value of g at the centre of the earth.

 

(bii) A body is taken to depth of 32km below the surface of the earth.

Calculate the percentage decrease in the weight of the body at this depth

(The radius of the earth is 6400km)

 

 

(4ai) Explain with example the term, damped harmonic motion

 

(ii) The periodic time of the pendulum executing simple harmonic motion is 2s. After how much interval from t = 0, will it displacement behalf of it amplitude?

 

 

(B) A wire of mass per unit length 5.0gm-1 is stretched between 2 points 30cm apart.

The tension in the wire is 70N.

Calculate the frequency of the sound emitted by the wire when it oscillates in the fundamental mode.

Moved to General Physics from Suggestions, Comments and Support.

We will help, but we are not going to do your homework for you.

 

Identify the parts of the question which you do not understand how to address, and then we can explain the principles you are missing.