Question

1. this dog weighs 18 kg. calculate the amount of force it would take to to lift the dog.
2. this stack of books weighs 8 kg. calculate the amount of force that the man has to exert to lift the books.

Explanation:

Step1: Identify the formula

The force \(F\) required to lift an object is given by \(F = mg\), where \(m\) is the mass and \(g\) is the acceleration due to gravity (\(g = 9.8\ m/s^{2}\)).

Step2: Calculate force for the dog

For the dog with \(m_1=18\ kg\), \(F_1=m_1g\). Substitute \(m_1 = 18\ kg\) and \(g = 9.8\ m/s^{2}\) into the formula: \(F_1=18\times9.8 = 176.4\ N\).

Step3: Calculate force for the books

For the stack of books with \(m_2 = 8\ kg\), \(F_2=m_2g\). Substitute \(m_2=8\ kg\) and \(g = 9.8\ m/s^{2}\) into the formula: \(F_2=8\times9.8=78.4\ N\).

Answer:

The force to lift the dog is \(176.4\ N\). The force to lift the books is \(78.4\ N\).