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Chapter 04 class 11 numerical problems || kpk board || feel the nature || Numerical Ch 4 physics||


00:14 Numerical 1
02:23 Numerical 2
06:16 Numerical 3
08:00 Numerical 4
13:44 Numerical 5
16:16 Numerical 6
18:06 Numerical 7
24:00 Numerical 9
27:36 Numerical 10
29:49 Numerical 11

1. A 70 kg man runs up a long flight of stairs in 4s. The vertical height of the stair is 4.5m, Calculate his power?

2. A body of mass 2.0 kg is dropped from a rest position 5m above the ground. What is its velocity at height of 3.0 m above the ground?

3. A man pulls a trolley through a distance of 50 m by applying a force of 100 N which makes an angle of 30o with horizontal. Calculate the work done by the man?

4. The roller-coaster car starts its journery from a vertical height of 40m on the first hill and reaches a vertical height of only 25m on the second hill, where it slows to a momentary stop. It travelled a total distance of 400m. Determine the thermal energy produced and estimate the average friction force on the car whose mass is 1000 kg.

5. A man whose mass is 70kg walks up to the third floor of a building which is 12m above the ground in 20s. Find his power in watts and hp.

6. To what height can a 400W engine lift a 100kg mass in 3s?

7. A ball of mass 100g is thrown vertically upward at a speed of 25 m/s. If no energy is lost, determine the height it would reach. If the ball only rises to 25m, calculate the work done against air resistance. Also calculate the force of friction.

9. A A body of mass ‘m’ drops from Bridge into water of river. The bridge is 10m high from the water surface.
(a) Find the speed of the body 5m above the water surface.
(b) Find the speed of the body before it strikes the water.

10. The engine of a JF-Thunder fighter (made by Pakistan and China) develops a thrust of 3000N. What horsepower does it at a velocity of 600m/s.
11. The mass of the moon is 1/80 of the mas of the earth and corresponding radius is ¼ of the earth. Calculate the escape velocity on the surface of moon.

Class 11
Physics
Chapter 4
Work and Energy
11th Class
1st Year
Federal Board
KPK Board
All Numerical Problems Chapter 4
Khyber Pakhtunkhwa Textbook board Peshawar
Balochistan Textbook board Quetta
New Book Physics Class 11 Numericals
Numerical Problems Chapter 4
Numerical Problems Chapter 4 Class 11 Physics First Year 1st Year Work and Energy
All solved numericals of Chapter 4 Work and Energy class 11


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