Question

• always use significant figure rules. remember that these rules apply to all numbers that are measurements.

a 2.0 - kg object moves in a circle of 0.50 m radius at 3.0 m/s. calculate the centripetal force.
36 n
2.4 n
12 n
3.6 n

Explanation:

Step1: Escribir la fórmula de fuerza centrípeta

$$F_c = m\frac{v^2}{r}$$

Step2: Sustituir valores

Dado $m = 2.0\,\text{kg}$, $v = 3.0\,\text{m/s}$, $r=0.50\,\text{m}$
$$F_c=(2.0)\frac{(3.0)^2}{0.50}$$

Step3: Calcular

$$F_c=(2.0)\frac{9.0}{0.50}=(2.0)(18)=36\,\text{N}$$

Answer:

36 N