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CBSE Class 9 Answered

if ultrasonic waves pass through obstacles than why waves of sonar waves get deflected back and doe
Asked by | 26 Feb, 2008, 01:41: PM
Expert Answer

Please post the question to physics expert.

Answered by | 11 Dec, 2017, 06:01: PM

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CBSE 9 - Physics
An object starts from rest and travels 20m in first 2 s and 160 m in 4 s . Find its velocity 7 s after the start .
Asked by asyadav1230 | 20 Dec, 2022, 07:17: AM
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CBSE 9 - Physics
Two points A and B are located on the floor of a room 30cm and 20cm away from a wall. The distance between the points parallel to the wall is 50cm. An insect is at moving on the floor at 5cm/s. It has to first reach a point C on the wall and then reach B such that AC and BC make equal angles with Normal to the wall at C. The time taken for this  motion will be
Asked by rajesh kumar | 21 Oct, 2022, 08:15: PM
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CBSE 9 - Physics
A student starts with a velocity 40 km/hr for school at 4 km away from his house. Due to closing of school he returns soon to his house with a velocity of 60km/hr.His average velocity will be.
Asked by manognabandla2004 | 08 Sep, 2022, 07:55: PM
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CBSE 9 - Physics
Time- 0 10 20 30 40 50 Speed- 5 10 15 20 25 30 Find the distance travelled in 50 seconds
Asked by akshatdhamija1409 | 15 Jul, 2022, 11:16: PM
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CBSE 9 - Physics
a body goes from a to b with a velocity of 20ms and come back from b to a the average velocity of 30ms the average velocity of the body during the whole journey is
Asked by ayushyadav70303 | 12 Jul, 2022, 07:32: AM
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CBSE 9 - Physics
why is it necessary for acceleration to be based on velocity but not on speed? why we dont consider the increasing speed of rectilinear motion as acceleration? why is it so in the first place?
Asked by kempersi267k | 01 Jul, 2022, 06:36: PM
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CBSE 9 - Physics
A car is traveling with a speed of 54 km/hr the driver applies the break and retards the car uniformly.the car is stopped in 5 seconds 1) The redardation of the car 2)Distance travelled before it is stopped after apply the break
Asked by rsaranya658 | 30 Jun, 2022, 02:44: PM
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CBSE 9 - Physics
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Asked by sanskargunjkar01 | 26 Jun, 2022, 09:13: AM
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CBSE 9 - Physics
how is equation if motion is formed in graphical method
Asked by poornimaram165 | 21 Jun, 2022, 09:16: PM
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CBSE 9 - Physics
definition of Motion
Asked by bablibhati187 | 21 Jun, 2022, 01:48: PM
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