Kinematics (NEST (National Entrance Screening Test) Physics): Questions 1 - 2 of 3

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Question number: 1

» Kinematics » Projectile Motion

Appeared in Year: 2013

MCQ▾

Question

Two identical particles are projected horizontally in opposite directions with a speed of each from the top of a tall tower as shown. Assuming , the distance between them at the moment when their velocity vectors become mutually perpendicular is –

Choices

Choice (4) Response

a.

b.

c.

d.

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Question number: 2

» Kinematics » Uniform and Non-Uniform Motion

Appeared in Year: 2008

MCQ▾

Question

Circle c Circle c: Circle through B with center AArc d Arc d: CircularArc [D, F, G] Arc e Arc e: CircularArc [E, H, I] Arc k Arc k: CircularArc [J, K, L] Angle α Angle α: Angle between E, C, DSegment f Segment f: Segment [B, A] Segment h Segment h: Segment [C, E] Segment g Segment g: Segment [D, C] Segment g Segment g: Segment [D, C] Segment g Segment g: Segment [D, C] Point D D = (3.22,4.36) Point D D = (3.22,4.36) Point E E = (3.76,1.81) Point E E = (3.76,1.81) Point G G = (3.46,4.98) Point G G = (3.46,4.98) Point I I = (4.24,2.24) Point I I = (4.24,2.24) Point L L = (2.22,3.34) Point L L = (2.22,3.34) a text1 = “a”T text1_1 = “T”omega text1_2 = “omega”omega_0 text1_3 = “omega_0”omega_0 text1_3 = “omega_0”b text1_4 = “b” heta text1_5 = “ heta “

A light string, with a particle of mass at one end, wraps itself about a fixed vertical cylinder of radius . The entire motion is in the horizontal plane (neglect gravity). The angular speed of the string (and the particle) is when the distance of the particle from the point of contact between the string and the cylinder is . The given figure is the top view of the entire process. If the angular speed is and the tension in the string is after the string has turned through an additional angle , then –

Choices

Choice (4) Response

a.

b.

Kinetic energy is conserved in this process.

c.

Angular momentum is conserved in this process.

d.

All c. , a. and b. are correct

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