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Laws of Motion

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Physics Part I

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s]

  • 350 Hz

  • 311 Hz

  • 411 Hz

  • 448 Hz


D.

448 Hz

straight f subscript straight A space equals space straight f open square brackets fraction numerator straight v plus straight v subscript 0 over denominator straight v minus straight v subscript straight s end fraction close square brackets
space equals space 400 space open square brackets fraction numerator 340 space plus 16.5 over denominator 340 minus 22 end fraction close square brackets
straight f subscript straight A space equals space 448 space Hz
straight f subscript straight A space equals space straight f open square brackets fraction numerator straight v plus straight v subscript 0 over denominator straight v minus straight v subscript straight s end fraction close square brackets
space equals space 400 space open square brackets fraction numerator 340 space plus 16.5 over denominator 340 minus 22 end fraction close square brackets
straight f subscript straight A space equals space 448 space Hz
1734 Views

State Galileo’s law of motion.

Galileo’s law of motion states that, a body continues to move in the same direction with constant speed, if no force is acting on the body. 
1332 Views

Define inertia.

The property by virtue of which the body cannot change its state of rest or uniform motion in a straight line, unless an external force is acting on the body is called as Inertia. 
1316 Views

When the branches of an apple tree are shaken, the apples fall down. Why?

The apple fall from an apple tree when it shaken because of inertia of rest. Apple is in a state of rest and when the tree is suddenly shaken, apples still tends to remain in it's same state of rest whereas branches move. 

So, the apples fall down. 
1475 Views

Is Aristotle’s law of motion now correct?

No. Aristotl'e law of motion is false. 
1233 Views

What is Aristotle’s law of motion?

Aristotle’s law of motion states that an external force is required to keep the body in motion.
2445 Views

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