NEET Physics: Questions 389 - 392 of 2099
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Pseudo force is an imaginary force which is recognized only by a non-inertial observer to explain the physical situation according to newton’s laws. Magnitude of pseudo force F is equal to the product of the mass m of the object and the acceleration a of the frame of reference. The direction of the force is opposite to the direction of acceleration, F =-ma
Question number: 389 (3 of 3 Based on Passage) Show Passage
Question number: 390
Question number: 391
Choose the correct options
(1) A reference frame in which Newton’s first law is valid is’ called an inertial reference frame.
(2) Frame moving at constant velocity relative to a known inertial frame is also an inertial frame.
(3) Ideally, no inertial frame exists in the universe for practical purpose, a frame of reference may be considered as inertial if its acceleration is negligible with respect to the acceleration of the object to be observed.
(4) To measure the acceleration of a falling apple, earth cannot be considered as an inertial frame.
Select the correct answers and mark it according to the following
1 and 3 are correct
1 and 2 are correct
1, 2 and 3 are correct
2 and 4 are correct
Question number: 392
Electric charges of 1μC, -1μC and 2μC are placed in air at the corners A, B and C respectively of an equilateral triangle ABC having length of each side 10 cm. The resultant force on the charge at C is