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Sunday, 17 January 2016

F.Sc ICS Notes: Physics XI: Chapter 4 Work and Energy Numerical Problems

F.Sc ICS Notes: Physics XI: Chapter 4 Work and Energy Numerical Problems

Numerical Problem 4.1: A man pushes a lawn mover with a 40N force directed at a angle of 20 degree downward from the horizontal. Find the work done by the man as he cuts a strip of grass 20m long.
Numerical Problem 4.2: A rain drop m = 3.35 * 10(-5)kg falls vertically at a constant speed under the influence of the forces of gravity ad friction. In falling through 100m, how much work is done by:
(a) Gravity:
(b) Friction:
F.Sc ICS Notes: Physics XI: Chapter 4 Work and Energy Numerical Problems by Asad Hussain
Numerical Problem 4.3: Ten bricks each 6cm thick and mass 1.5kg, lie flat on a table. How much work is required to stack them one on the top of another.
F.Sc ICS Notes: Physics XI: Chapter 4 Work and Energy Numerical Problems by Asad Hussain 1
Numerical Problem 4.4: A car of mass 800kg traveling at 54km/h is brought to rest in 60 meters. Find the average retarding force on the car. What has happened to the original K.E?
F.Sc ICS Notes: Physics XI: Chapter 4 Work and Energy Numerical Problems by Asad Hussain 2
Numerical Problem 4.5: A 1000kg automobile at the top of an inclined plane 10m high and 100m long is released and rolls down the hill. What is its speed at the bottom of inclined if the average retarding force due to friction is 480N?
F.Sc ICS Notes: Physics XI: Chapter 4 Work and Energy Numerical Problems by Asad Hussain 4
Numerical Problem 4.6: If 100m(3) of water is pumped from a reservoir into a tank, 10 m higher than the reservoir, in 20 minutes. If density of water is 1000kg/m(3), find
(a) The increase in P.E
(b) The power delivered by pump.
F.Sc ICS Notes: Physics XI: Chapter 4 Work and Energy Numerical Problems by Asad Hussain 5

Numerical Problem 4.7: A force(thrust) of 400N is required to overcome road friction and air resistance in propelling an automobile at 80km/h. What power kW must the engine develop?
Numerical Problem 4.8: How large a force is required to accelerate an electron (m 9.1 * 10 (-31)kg) from rest to a speed of 92 * 10(7)m/s) through a distance of 5cm.
F.Sc ICS Notes: Physics XI: Chapter 4 Work and Energy Numerical Problems by Asad Hussain 6
Numerical Problem 4.9: A diver weighing 750N dive from a board 10m above the surface of the pool pf water. Use the conservation of mechanical energy to find the speed at a point 5m above the water surface, neglecting air friction.
F.Sc ICS Notes: Physics XI: Chapter 4 Work and Energy Numerical Problems by Asad Hussain 7
Numerical Problem 4.10: A child starts from the rest at the top of a slide of height 4m.
(a) What is the his speed at the bottom if the slide is friction less?
(b) If he reaches the bottom, with a speed of 6 m/s. What percentage of his total energy at the top of the slide is lost as a result of friction?
F.Sc ICS Notes: Physics XI: Chapter 4 Work and Energy Numerical Problems by Asad Hussain 8

Written by: Asad Hussain

2 comments:

  1. Two cars are moving to each other from opposite directions with same speed the horn of one is blowing with frequency of 3000Hz and is heard by people in other car with frequency of 3400Hz find speed of cars if speed of sound in air is 340m/s how it can be solved

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    1. You can view the solution by visiting
      http://fscnotes0.blogspot.com/p/ask.html

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