The electrical resistance of the wire is proportional to its length L and inversely proportional to the square of its diameter,
.
The length of the wire in the problem is changed from 200 inches to 500 inches, so the new length is 2.5 times the initial length:
the diameter of the wire is not changed, so the new electrical resistance must be 2.5 times the original value:
La rapidez es una magnitud escalar que relaciona la distancia recorrida con el tiempo.
La velocidad es una magnitud vectorial que relaciona el cambio de posición (o desplazamiento) con el tiempo.
Answer:
15.1°
Explanation:
The horizontal velocity of the hockey puck is constant during the motion, since there are no forces acting along this direction:
Instead, the vertical velocity changes, due to the presence of the acceleration due to gravity:
(1)
where
is the initial vertical velocity
g = 9.8 m/s^2 is the gravitational acceleration
t is the time
Since the hockey puck falls from a height of h=2.00 m, the time it needs to reach the ground is given by
Substituting t into (1) we find the final vertical velocity
where the negative sign means that the velocity is downward.
Now that we have both components of the velocity, we can calculate the angle with respect to the horizontal:
Answer: width = 27.94 cm
Explanation:
Given a sheet of a standard-sized (8.5in x 11.0in) loose-leaf notebook paper.
From the value given, the width is 11.0 inches
To make the measurement in centimeters, we will convert inches into centimeters.
1 inche = 2.54 centimeters
That is, 11 × 2.54 centimeters = 27.94 cm.
Therefore, the width is 27.94 cm.
