Answer:
4. B) 69N
5. B) 7.2kg
Explanation:
Dados los siguientes parámetros;
Masa = 7kg
Peso = 71N
La aceleración debida a la gravedad es igual a 9.8m/s².
a. Para determinar el peso de la siguiente masa;
Matemáticamente, el peso viene dada por la fórmula;
Peso = masa * aceleración debida a la gravedad
Peso = 7 * 9.8
Peso = 68.6 ≈ 69 Newton.
b. ¿Cuál es la masa sobre la tierra de un objeto que pesa.
Peso = masa * aceleración debida a la gravedad
71 = masa * 9.8
Masa = 71/9.8
Masa = 7.2 Kilograms.
We know that the acceleration due to gravity g is: g =
9.81 m/s^2
So the centripetal acceleration (w) is:
w^2 = 1.5 g / r
w^2 = 1.5 * (9.81 m/s^2) / 5 m
w = 1.716 rad / s
To convert to rad to rev:
w = (1.716 rad / s) * (1 rev / 2π rad) * (60 s/min)
<span>w = 16.4 rev/min </span>
<span>The question is asking us what is BEST to say about a runner who is running at a constant velocity? A constant velocity (=speed) means that they are not getting faster or slower - they are running exactly as fast all the time. This meanst that their speed does not change, so their change of speed is equal to 0. A change of speed is called acceleration so their C. Their acceleration is zero. - C is the correct answer. </span>
