In a car, the speedometer measures instantaneuos speed right? And the speed limit signs refer to instantaneous speed too? How long does it take light to travela distance of 1 km? When an object moves at constant velocity, does its average velocity differ from its instantaneous velocity?
2006-10-02 13:53:57 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Physics
In science and engineering there is an important difference between speed and velocity. If a car's speedometer reads say 55 MPH that is the speed regardless of whether the car is on a straightaway or going around a curve. However velocity is a vector which is a speed in a specific direction. If a car is traveling at 55 MPH due east, its velocity is 55 MPH east but zero MPH north. If the car is traveling at constant speed around a rotary its velocity is constantly changing. Its instantaneous velocity may be 55 MPH east, or NE or NW, etc.
2006-10-02 14:51:12 · answer #1 · answered by Kes 7 · 0⤊ 0⤋
Yes the speedometer tells your instantaneous speed. It takes light 1/300 000 of a second to travel 1 km. in a vacuum.If you're moving at constant velocity, your average and instantaneous velocities are the same.
2006-10-02 14:04:02 · answer #2 · answered by zee_prime 6 · 0⤊ 0⤋
If I drive for 10 minutes at 30 miles per hour, and then drive for 10 minutes at 50 miles per hour, my average velocity is 40 miles per hour. At any instant during the first 10 minutes, my instantaneous velocity is 30 miles per hour. At any instant during the second 10 minutes, my instantaneous velocity is 50 miles per hour. If it is a 40 miles per hour zone, when the cop pulls you over, you get a ticket for your instantaneous velocity of 50 miles per hour - he won't care that your average velocity was only 40 miles per hour. Your speedometer will also be reading your instantaneous velocity (i.e. the velocity you happen to be going at that instant).
But if you are going at constant speed, say 40 miles per hour, then your instantaneous velocity will be the same for the whole trip - and your average velocity will also be 40 miles per hour.
2006-10-02 14:08:32 · answer #3 · answered by WildOtter 5 · 0⤊ 0⤋
1)yes
2) yes
3) If your going 1 km/hr it takes 1 hr to travel 1 km. If your going 60 km/hr, it takes 1 min to travel 1 km.
4)Yes, when an object moves at const. velocity, its avg. velocity is equal to its instantaneous velocity.
2006-10-02 13:59:50 · answer #4 · answered by msol800 2 · 0⤊ 0⤋
Yes. Yes. Light travels 3x10 ^ 8 m/s, so it takes 0.00000000333 seconds for light to travel a meter. No, they are the same in this unique case.
2006-10-02 13:59:32 · answer #5 · answered by Jeff Scheidt 2 · 0⤊ 0⤋
The (v-u)/t is the formulation. Acceleration is the speed of replace of speed. So once you subtract the cost, it really is the cost (it truly is easily like %) replace, in 1s. it truly is why you divide by skill of the time. speed is % with the course. speed will be negative yet % can't. Displacement is distance with the course. Displacement will be negative yet distance can't. at the same time as displacement is negative, it signifies that the article is vacationing backwards to the position it began. some thing like that.
2016-11-25 23:35:11 · answer #6 · answered by Anonymous · 0⤊ 0⤋