Explanation:
It is given that,
Mass of the car, m = 1000 kg
Speed of the car, v = 100 km/h = 27.77 m/s
The coefficient of kinetic friction of the tires,
Let f is the net force acting on the body due to frictional force, such that,
We know that the acceleration of the car in calculus is given by :
, x is the stopping distance
On solving the above equation, we get, x = 78.69 meters
So, the stopping distance for the car is 78.69 meters. Hence, this is the required solution.
Answer:
Falso. Se requiere de dos vectores de igual magnitud pero antiparalelos entre sí.
Explanation:
Un vector es un elemento caracterizado por tener magnitud y dirección, sea un vector tal que la resultante sea
(vector nulo). Por Álgebra de los Reales se sabe que todo vector tiene su inverso, es decir, que existe un vector
tal que:
Esto significa, que el siguiente sistema de ecuaciones debe satisfacerse:
Se requiere de dos vectores de igual magnitud pero antiparalelos entre sí. En consecuencia, la anterior afirmación es falsa.
Answer:
Explanation:
The first diagram (by the left) is an endothermic reaction. In this reaction, the products are higher in energy than the reactants. Heat/Energy is absorbed in this reaction and enthalpy is positive. In second diagram (by the right) is an exothermic reaction. In this reaction, the reactants are higher in energy than the products. In this reaction, heat/energy is released.
Answer:
The force is 1.34 newtons and its direction is upward.
Explanation:
Choosing positive direction pointing towards the floor in this collision we're going to use the momentum-impulse theorem that states:
(1)
with the change in the momentum and J the impulse, with pi the initial momentum that is the momentum just before the collision and pf the final momentum th is the momentum just after the collision. The impulse J is also defined as:
(2)
with the average force and
the time the collision lasts
We can equate expressions (2) and (1):
Using the definition of linear momentum as mass (m) time velocity (v):
We can solve for Favg:
(3)
Now we should find the velocities vf and vi, we should do this using conservation of energy:
For the velocity the ball has just before reaches the floor:
With Ui the initial potential energy (there is not initial kinetic energy) and Kf the final kinetic energy (there is not final potential energy), then:
solving for vi:
For the velocity the ball has just after bounces the floor:
There is not initial potential energy because it's a floor level at this instant, and the there is not final kinetic energy because the ball has instantly zero velocity at its maximum height (hm), then:
solvig for vf:
Using vf and vi on (3):
The negative sign indicates the direction of the force is pointing away the floor