Answer:
A) B = 5.4 10⁻⁵ T, B) the positive side of the bar is to the West
Explanation:
A) For this exercise we must use the expression of Faraday's law for a moving body
fem = 
fem = 
- d (B l y) / dt = - B lv
B = 
we calculate
B = - 7.9 10⁻⁴ /(0.73 20)
B = 5.4 10⁻⁵ T
B) to determine which side of the bar is positive, we must use the right hand rule
the thumb points in the direction of the rod movement to the south, the magnetic field points in the horizontal direction and the rod is in the east-west direction.
Therefore the force points in the direction perpendicular to the velocity and the magnetic field is in the east direction; therefore the positive side of the bar is to the West
Answer:
La fuerza que realiza el motor es 2035 N.
Explanation:
Podemos encontrar la fuerza del motor usando la siguiente ecuación:
(1)
En donde:
m: es la masa del coche = 550 kg
a: es la aceleración
Se puede calcular la aceleración mediante la siguiente ecuación cinemática:
(2)
En donde:
: es la velocidad final del coche = 100 km/h
: es la velocidad inicial del coche = 0
t: es el tiempo = 7,5 s
Resolviendo la ecuación (2) para "a" tenemos:
Entonces, la fuerza es:
Por lo tanto, la fuerza que realiza el motor es 2035 N.
Espero que te sea de utilidad!
Each ball, when released, will fall toward the center of the big ball that everybody is standing on.
Another way to describe it: Each ball, when released, will fall in the direction parallel to a line from the boy's head to his feet.
-- The ball held by the boy on top will fall toward the bottom of the picture.
-- The ball held by the boy on the right will fall toward the left side of the picture.
-- The ball held by the boy on the bottom will fall toward the top of the picture.
-- The ball held by the boy on the left will fall toward the right side of the picture.
In each case, the direction toward the center of the big ball that they're all standing on is the direction that each person calls "down".
-reflection and refraction of light
-dispersion of light
-absorption of light
-polarization of light
Answer:
The acceleration of the bag of sand is 
.
Explanation:
We have,
Mass of a bag of sand is 100 kg
Weight of the bag of sand is 100 N
It is required to find the acceleration of the bag when it is dropped. The weight of an object is given by :
When it is dropped, a = g
So, the acceleration of the bag of sand is .
