physics questions

[devrimci_kürt]

1-A jogger travels from x=0 to x=50 m between t=0 and t=10 s.Between t=10 s and t=15 s, the jogger travels from x=50 m to x =25 m. Is the distance traveled by the jogger equal to the magnitude of his displacement (a)between t=0 and t=10 s. (b)=between t=10 and t=15 s?Explain..

[insane_alien]

first of all, do you know the difference between distance and displacement.

[devrimci_kürt]

of course

Distance is the scalar but displacement is the vector ...

in other words, Distance is the absolute value of the displacement..

for example, someone walked 3 km and the walked back the 3 km,

then distance will be 6 km but displacement will be zero....

 

 

is my answer right ?

[timo]

Distance is the scalar but displacement is the vector ...

in other words, Distance is the absolute value of the displacement..

That's not really the same statement with different words. You'd probably call the body temperature of the jogger a scalar, but it certainly isn't the absolute value of the displacement.

 

for example, someone walked 3 km and the walked back the 3 km,

then distance will be 6 km but displacement will be zero.

Doesn't that contradict your statement that distance is the absolute value of the displacement vector, i.e. the absolute value of the vector (0 km,0 km,0 km) ?

 

is my answer right?

It is confused.

 

Hint: The question does not ask for "distance", which can be a lot of stuff (including the magnitude of displacement). It asks for "distance travelled".

[devrimci_kürt]

the absolute value

ok, let us forget it

in this question, distances and magnitude of displacement are equal...

right?