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Q. If the net force acting on an object is in the positive x-direction, the object moves only in the positive x-direction.
It is not true, the object will accelerate only in the x-direction, but it may be traveling in the y-direction and it could continue to do so making the path it follows a parabola. Think about a ball kicked off a cliff. There is a net force only in the y-direction (gravity) so the ball will accelerate downwards while continuing with a constant horizontal velocity.
An elevator is stopped at the ground floor. It starts moving upwards at constant acceleration for 5 seconds. It then keeps a constant speed for 35 seconds. Finally, it slows down
Explain the term 'critical frequency' in relation to sky wave propagation of electromagnetic waves. On a particular day, the maximum frequency reflected from the ionosphere is
Q. Give the basic assumptions made in free electron model of solid. OR Write down basic postulates of Sommerfield's free electron gas model. Show that the number of ene
A 12 volt battery is associated across a series combination of two capacitors C1 and C2. The capacitance of C2 is double that of C1.
If we permit monochromatic light to fall normally on the surface of lens, then circular interference fringes of radius r can be consider in the reflected light. This circular fring
What is the significance of negative work?
Explain Kelvin-Planck statement and Clausius statement Kelvin-Planck statement: "No process is possible whose sole result is the absorption of heat from a reservoir and the t
How is plastic fibre material used in optical fibres? Plastic fibre: Plastic fibre is classically made of plastic. Such are low cost optical fibres. They have a huge NA and
In a Wheatstone bridge ABCD, a galvanometer is connected between A and C, and a battery among B and D. A resistor of unknown value is connected among A and B. When the bridg
A conductor moves with a velocity of 20m/s at an angle of (a) 90 ? (b) 45 ? (c) 30 ? , to a magnetic field produced among two square-faced poles of side length 2.5cm. If the
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