The law of motion involved in the recoil of gun is

Why does a cannon recoil after firing ?

A

Conservation of energy

B

Backward thrust of gases produced

C

Newton's third law of motion

D

Newton's first law of motion

স্থির পানির উপর ভাসমান নৌকা হতে একজন বালক অনুভূমিক দিকে লাফ দিয়ে তীরে পৌঁছাল। নৌকার এবং বালকের ভর যথাক্রমে 200 kg এবং 50kg। বালকের বেগ 20 m/s হলে, নৌকার পশ্চাৎ বেগ কত? (A boy jumps horizontally from a boat floating on stationary water and reaches the shore. The mass of the boat and the boy are 200 kg and 50 kg respectively. If the velocity of the boy is 20 m/s, what is the recoil velocity of the boat?)

A

5.0 m/s

B

7.5 m/s

C

9.0 m/s

D

6.5 m/s

An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's

A

First law

B

Second law

C

Third law

D

Fourth law

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

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

One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where $$\delta $$ = Deflection of the spring.)

A

$$2\pi \sqrt {\frac{g}{\delta }} $$

B

$$\frac{1}{{2\pi }}\sqrt {\frac{g}{\delta }} $$

C

$$2\pi \sqrt {\frac{\delta }{g}} $$

D

$$\frac{1}{{2\pi }}\sqrt {\frac{\delta }{g}} $$

What is the gap period between first no-confidence motion and second no-confidence motion-

A

12 months

B

3 months

C

6 months

D

9 months

The motion between a pair which takes place in __________ is known as incompletely constrained motion.

A

One direction only

B

Two directions only

C

More than one direction

D

None of these

One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where $$\delta $$ = Deflection of the spring)

A

$$2\pi \sqrt {\frac{{\text{g}}}{\delta }} $$

B

$$\frac{1}{{2\pi }}\sqrt {\frac{{\text{g}}}{\delta }} $$

C

$$2\pi \sqrt {\frac{\delta }{{\text{g}}}} $$

D

$$\frac{1}{{2\pi }}\sqrt {\frac{\delta }{{\text{g}}}} $$

The ratio of the ranges on the inclined plane with motion upward and with motion downward for a given velocity, angle of projection will be

A

$$\frac{{\sin \left( {\alpha + \beta } \right)}}{{\sin \left( {\alpha - \beta } \right)}}$$

B

$$\frac{{\sin \left( {\alpha - \beta } \right)}}{{\sin \left( {\alpha + \beta } \right)}}$$

C

$$\frac{{\cos \left( {\alpha - \beta } \right)}}{{\cos \left( {\alpha + \beta } \right)}}$$

D

$$\frac{{\tan \left( {\alpha - \beta } \right)}}{{\tan \left( {\alpha + \beta } \right)}}$$

"To stick to one's gun" means---

A

to be brave

B

to be arrogant

C

to stand near a gun

D

to refuse to change one's position

The law of motion involved in the recoil of gun is

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