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Motion In Straight Line

Question
CBSEENPH11026276
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The engine of a jet aircraft applies a thrown force of 105 N during take off and causes the plane to attain a velocity of 1 km/s in 10 s. The mass of the plane is

  • 102 kg

  • 103 kg

  • 104 kg

  • 105 kg

Solution

B.

103 kg

Given:- Force F = 105 N

  Velocity during take off = 1 km/s = 1000 m

      i.e       initial velocity = 0

Hence Change in velocity = (103 - 0) 

 And time t = 1

The acceleration produced in jet

             α =Change in velocitytime

             α = 103 - 010

                 = 100 m/s2

∴ Mass = Forceacceleration

          = 105102

⇒  Mass = 103 kg

Some More Questions From Motion in Straight Line Chapter

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

 A particle is moving along curved line in space. Is the motion one dimensional?

State which of the following are examples of one, two or three dimensional motion: 

(a) A kite flying in the sky.

(b) The earth revolving around the sun. 

(c) A train moving along the equator of the earth in clockwise direction. 

(d) Accelerated motion of a particle in a straight line.

Define distance.

Define displacement.

Can magnitude of displacement be greater than distance travelled by particle?

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