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The position vector of a particle is expressed as( r) ⃗= 3t î +2t2j ̂ where t is in second , r in metre find a) velocity as a function of time b) magnitude of velocity at t = 3sec c) acceleration ?

Posted by S Dubey 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Mahima Sharma 7 years, 9 months ago

A)3+4t b) 15m/s c) 4 m/s^2

ANSWER

Explain how stationary waves are formed in open and closed organ pipes.compare first three harmonic produced in them.

Posted by Nikita Kumar 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Why are hammers with a long handle preferred

Posted by Mayank Raj 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Why are hammer with a long handle

Posted by Mayank Raj 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Why iron girdens are made I shaped

Posted by Divyansh Khelani 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

What is escape velocity and derive an equation

Posted by Sagar Unnithan 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Can kinetic energy be negative?

Posted by Anshu Kumari 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Rohan Gupta 7 years, 9 months ago

No because k=1/2mv^2 both m and v^2 can't be negative

ANSWER

Deduce the height at which the value of g is the same as at a depth as R / 2

Posted by Rimi Ansari 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Rohan Gupta 7 years, 9 months ago

h=(1-√2/√2)R

ANSWER

An oxygen cylinder of volume 30 litres has an initial gauge pressure of 15 atm and the temperature of 27 degree Celsius. After some oxygen is withdrawn from the cylinder the gauge pressure drops to 11 atm and its temperature drops to 17 degree Celsius. Estimate mass of oxygen taken out of the cylinder.(R=8.31J/mol/K, molecular mass of oxygen=32 u)

Posted by N P 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Rohan Gupta 7 years, 9 months ago

585.36gm

ANSWER

Can we boil water without heating?

Posted by Kirti Bhardwaj 7 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Mohit Fdk 7 years, 9 months ago

By increasing pressure

Ajeet Jat 7 years, 9 months ago

Yes, by taking allready boild water

ANSWER

Write four fundamental force in an ascending order of their strength ?

Posted by Paras Rajput 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Talha Sarfraz 7 years, 9 months ago

Gravitational:weak nuclear force: electromagnetic force:strong nuclear force That is in ratio 1:10^25:10^36:10^38

ANSWER

Write four fundamental force in an ascending order if their strength

Posted by Paras Rajput 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Why physics is so difficult???

Posted by Abhishek Aggarwal 7 years, 9 months ago

CBSE > Class 11 > Physics

4 answers

Aastha Sarswat 7 years, 9 months ago

Phy sabse acha sub h use daily life we relate kro

Priyanka Singh Rai Rai 7 years, 9 months ago

Just focus on concept. If your concepts are clear than you can easily aolve max.questions..?

Kirti Bhardwaj 7 years, 9 months ago

Physics is not so difficult But sometimes we are nota able to solve question it's not mean that physics is difficult

Priyanka Singh Rai Rai 7 years, 9 months ago

Physics is so easy

ANSWER

What r conservative Forces?

Posted by Nitish Swan 7 years, 9 months ago

CBSE > Class 11 > Physics

3 answers

Nitish Swan 7 years, 9 months ago

Aur Amit tu mera naukar hai Agar answer nahi aata to mat de pr ye Harkaten mat dikha....there r more people intelligent than you SOAB!!!

Nitish Swan 7 years, 9 months ago

Thanks a lot Astha

Aastha Sarswat 7 years, 9 months ago

Force which. Depends on final and initial stage not on path

ANSWER

What are the two condition for motion to be called oscillatory?

Posted by Kapil Shakyawal 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

What are the two condition for motion to be called as oscilltory?

Posted by Kapil Shakyawal 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

what is terminal speed ??

Posted by Divyansh Atal 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Talha Sarfraz 7 years, 9 months ago

The maximum speed gained by the body while falling in a viscous liquid

ANSWER

Why action and reaction forces do not balance each other?

Posted by Dibya Patra 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

The radius of earth is6*10power9 at what distance from the center of earth the weight becomes half

Posted by Manish Bisht 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

what is the SI unit of gravitational constant

Posted by Surbhi Singh 7 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Dibya Patra 7 years, 9 months ago

N m↑2/kg↑2

Priyanka Singh Rai Rai 7 years, 9 months ago

Newton

ANSWER

Cp greater than cv derive relation

Posted by Navdeep Kaur Navdeep 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Deepak Kumar 7 years, 9 months ago

Cp - Cv =R Cp= Cv+ R From these we can say Cp is greater than R. ?

ANSWER

Show that the value of g decreases with depth

Posted by Md Shahvez 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

State and prove Carnot theorm

Posted by Arpit Chaudhary 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Equation of motion derive it

Posted by Kumar Saksham 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Can I get information about practical...?

Posted by Revathi Narayan 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

A cricket ball gets deformed, when it is hit continously? Why?

Posted by Narendra Naidu 7 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Action and reaction force do not balance each other why?

Posted by Lalit Kumar 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Aastha Sarswat 7 years, 9 months ago

Bcz they both acts on diff surfaces

ANSWER

If momentum of a body becomes double then what will be effect on kinetic energy?

Posted by Priyanshu Yadav 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Talha Sarfraz 7 years, 9 months ago

We know p=√2kinetic energy× mass Squaring both side P^2=2kE×m P is doubled (2p)^2=2×2kE×m 4p^2=4kE×m P^2=kE×,m P=√kE×m So when momentum is doubled kE becomes √kE×m

ANSWER

Name the turning effect of force and its SI unit

Posted by Gaurav Gupta 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

S E 7 years, 9 months ago

Torque So unit tou

ANSWER

Find average friction force that would stop a car of mass 500kg ina distance of 25 m. If the initial speed is 72km/h?

Posted by Karan Negi 7 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Abhishek Tiwari 7 years, 9 months ago

U=72*5/18=20m/s. S=ut+1/2at² V=u+at 0=20+at at=-20 25=20t-10t t=2.5 at=-20 a=-20/2.5 a=-8 Friction force= 500*8=-4000 N

ANSWER

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