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प्रश्न
Asher says all objects having uniform speed need not have uniform velocity. Give reason.
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उत्तर
An object moving in uniform circular motion is moving around the perimeter of the circle with a constant speed. While the speed of object is constant, its velocity is changing, Ex: Merry-go-round, roller coaster, planets orbiting the sun.
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संबंधित प्रश्न
Do speed and average speed of a body have the same meaning?
Arrange the following speeds in the increasing order:
(i) A bicycle moving with a speed of 36 km/h.
(ii) A car moving with a speed of 2 km/min.
(iii) An athlete running with a speed of 7 m/s.
Does uniform speed mean constant speed?
Is the average speed during different time intervals for a uniform motion the same or different?
A girl had designed a clap switch for a science exhibition that enabled her to switch on or off an alarm just with clapping of hands. While testing her device in a hall, she noticed that once the alarm has sounded it followed with another one due to echo of the clap, that is, the sound reflected by the walls. She recorded the two soundings of alarm with her tape recorder and found out that time difference in between them is 0.1 s. If the distance of the walls be 15 m, calculate the speed of sound.
Complete the analogy.
Distance : metre :: Speed: ______?
A vehicle covers a distance of 400km in 5 hours. Calculate its speed.
The speed of a train is expressed in m/h.
A spaceship travels 36,000 km in one hour. Express its speed in km/s.
Why did the actual speed differ from the average, speed?
