The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

The component of the acceleration, parallel to the velocity of the particle, at the given instant is called

A

Radial component

B

Tangential component

C

Coriolis component

D

None of these

The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called

A

Radial component

B

Tangential component

C

Coriolis component

D

None of these

The acceleration of a particle moving with simple harmonic motion, at any instant is given by

A

$$\omega {\text{y}}$$

B

$${\omega ^2}{\text{y}}$$

C

$$\frac{{{\omega ^2}}}{{\text{y}}}$$

D

$${\omega ^3}{\text{y}}$$

The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion and y = Displacement of the particle from mean position.)

A

$$\omega \sqrt {{{\text{y}}^2} - {{\text{r}}^2}} $$

B

$$\omega \sqrt {{{\text{r}}^2} - {{\text{y}}^2}} $$

C

$${\omega ^2}\sqrt {{{\text{y}}^2} - {{\text{r}}^2}} $$

D

$${\omega ^2}\sqrt {{{\text{r}}^2} - {{\text{y}}^2}} $$

The velocity of a particle moving with simple harmonic motion, at any instant is given by (where $$\omega $$ = Displacement of the particle from mean position)

A

$$\omega \sqrt {{{\text{x}}^2} - {{\text{r}}^2}} $$

B

$$\omega \sqrt {{{\text{r}}^2} - {{\text{x}}^2}} $$

C

$${\omega ^2}\sqrt {{{\text{x}}^2} - {{\text{r}}^2}} $$

D

$${\omega ^2}\sqrt {{{\text{r}}^2} - {{\text{x}}^2}} $$

If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant

A

Is zero

B

Is the sum of the two currents

C

Is the difference between the two currents

D

Cannot be determined

The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as

A

One dimensional flow

B

Uniform flow

C

Steady flow

D

Turbulent flow

গরম বাতাসে পরিপূর্ণ M ভরের একটি বেলুন (থ্রডি সহ) পৃথিবীর দিকে খুব ত্বরণ a তে নেমে আসছে। ঝুড়ি থেকে কি পরিমান m ভর ফেলে দিলে বেলুনটি উপরের দিকে একই খুব ত্বরন a- তে উঠে যাবে ? সকল ক্ষেত্রে বেলুনটির আয়তন একই ছিল বলে ধরে নেওয়া হলো। (g = অভিকর্ষীয় ত্বরন)(A hot air balloon with a bucket is descending towards the earth with a constant acceleration a. The combined mass of the balloon and bucket is M. What mass m from the bucket should be released so that the balloon starts ascending up with the same acceleration a? Consider the volume of the balloon remains constant at all the time. (g=acceleration due to gravity))

A

m=2ag+aM

B

m=g+a2M

C

m=2ag M

D

m=M2a(g+a)

E

m=ag+M

A point B on a rigid link AB moves with respect to A with angular velocity $$\omega $$ rad/s. The radial component of the acceleration of B with respect to A, is (where vBA = Linear velocity of B with respect to A)

A

vBA × AB

B

$$\frac{{{\text{vBA}}}}{{{\text{AB}}}}$$

C

v²BA

D

$$\frac{{{{\text{v}}^2}{\text{BA}}}}{{{\text{AB}}}}$$

Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?

A

Sphere

B

Cube

C

Cylinder (L/D = 1)

D

Raschig rings

The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

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