Answer:
Your little sister (mass 25.0 ) is sitting in her little red wagon (mass 8.50 at rest. You begin pulling her forward and continue accelerating her with a constant force for 2.35 at the end of which time she's moving at a speed of 1.80 .
(a) Calculate the impulse you imparted to the wagon and its passenger. (b) With what force did you pull on the wagon?
V= 70 km/h = 70 *(1000/3600)= 19.44 m/s
m=0.5 t = 500 kg
Ek=?
Ek=0.5*m*V²
Ek=0.5*500*19.44²
Ek = 94522 J = 94.522 kJ
Answer:
Decreased by a factor of 4.5
Explanation:
"We have Newton formula for attraction force between 2 objects with mass and a distance between them:
where 
is the gravitational constant on Earth. 
are the masses of the object and Earth itself. and R distance between, or the Earth radius.
So when R is tripled and mass is doubled, we have the following ratio of the new gravity over the old ones:
Since 
and 
So gravity would have been decreased by a factor of 4.5
