There's really no way to calculate Molly's pulling force, because all
of the data given in the question only describes Samantha's situation.
The following solution assumes that Molly's wagon and dog are identical
in mass, acceleration, and frictionlessness to Samantha's:
Force = (mass) x (acceleration) =
(45 kg) x (0.85 m/s²) = <em>38.25 newtons</em>
(Assuming there's no friction anywhere in the wagon/ground system.)
Answer:
Approximately assuming no heat exchange between the mixture and the surroundings.
Explanation:
Consider an object of specific heat capacity and mass . Increasing the temperature of this object by would require .
Look up the specific heat of water: .
It is given that the mass of the water in this mixture is .
Temperature change of the water: .
Thus, the water in this mixture would have absorbed :
.
Thus, the energy that water absorbed was: .
Assuming that there was no heat exchange between the mixture and its surroundings. The energy that the water in this mixture absorbed, , would be the opposite of the energy that the metal in this mixture released.
Thus: (negative because the metal in this mixture released energy rather than absorbing energy.)
Mass of the metal in this mixture: .
Temperature change of the metal in this mixture: .
Rearrange the equation to obtain an expression for the specific heat capacity: . The (average) specific heat capacity of the metal pieces in this mixture would be:
.
A magnet has a South Pole and a North Pole. South Pole and South Pole can't connect to her other, same as North and North. The same poles push each other away.
South Pole and North Pole connect.