In a football game, running back is at the 10-yard line and running up the field towards the 50 yard
1 answer:
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Answer:
Explanation:
Since the front and back of the rocket simultaneously line up with forward and backward end of the platform respectively .
Then length of the platform = length of the train rocket .
A )
Time to cross a particular point on the platform
= length of rocket train / .96 x 3 x 10⁸
= 90 / .96 x 3 x 10⁸
= 31.25 x 10⁻⁸ s
B) Rest length of the rocket = length of platform = 90 m
C ) length of platform as viewed by moving observer =
=
= 321 m
D ) For the observer on platform time taken = 31.25 x 10⁻⁸ s
for the observer in the rocket , time will be dilated so time recorded by observer in motion ,
8.75 x 10⁻⁸ s .
Answer: k=
Explanation:
Recall that the formula for kinetic energy is given below as
k =
where k=kinetic energy (joules), m= mass of object (kg), v= velocity of object m/s)
For cart A
= mass of cart A
= v = velocity of cart A
= kinetic energy of cart A
hence, =
For cart B
= mass of cart B
= 2v = velocity of cart B
= kinetic energy of cart B
hence, =
= 2
from the question, both cart are identical which implies they have the same mass i.e =
= m which implies that
and
The total kinetic energy K is the sum of cart A and cart B kinetic energy
hence
Explanation:
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