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51.

Which of the following laws of motion is related to inertia?(a) First law(b) Second Law(c) Third Law(d) Fourth LawThe question was asked in exam.The doubt is from Laws of Motion Basics topic in division Laws of Motion of Physics – Class 11

Answer»

The CORRECT option is (a) First LAW

The best explanation: The first law of motion states that a body remains in the state of motion or in the state of rest until and UNLESS an external force is applied on it. This is also KNOWN as the law of inertia. Hence the answer is, the first law.
Discussion
52.

A car moving around a tree has the distance from the tree defined as r = 5t^2 + 7. What is the magnitude of the centripetal acceleration at t = 2s, if the angular velocity is 2 rad/s.(a) 102(b) 108(c) 59(d) 54I got this question in exam.Query is from Non-Uniform Circular Motion in division Laws of Motion of Physics – Class 11

Answer»

Right option is (b) 108

For explanation: The centripetal acceleration is GIVEN as AC = rω^2. Here, we have r = 5t^2 + 7 = 27 units at t = 2s. Angular velocity is 2 rad/s. On substituting all the values, we GET, the acceleration as 108 units/s^2.
Discussion
53.

Two bodies of masses 2 Kg and 7 Kg are moving with velocities of 2 m/s and 7 m/s respectively. What is the total momentum of the system in Kg-m/s?(a) 50(b) 53(c) 28(d) 0I had been asked this question in quiz.The query is from Laws of Motion in portion Laws of Motion of Physics – Class 11

Answer»

The correct answer is (b) 53

Best explanation: Both the bodies are moving with constant velocity, hence both of them have momentum. The momentum of the system is the SUM of the momenta of the bodies. Hence total momentum = 2 X 2 + 7 x 7 = 53 Kg-m/s.
Discussion
54.

Which law of Newton helps in finding the force on a body?(a) First law(b) Second Law(c) Third Law(d) Fourth LawI got this question in class test.I'd like to ask this question from Laws of Motion Basics topic in chapter Laws of Motion of Physics – Class 11

Answer» RIGHT choice is (b) Second Law

The best I can explain: The second law of motion STATES that the NET force APPLIED on a body is proportional to the rate of CHANGE of momentum. On further experimentation, it was found that the force applied on a body is equal to the rate of change of momentum.
Discussion