Record the weight w of the rectangular block of modelling clay shown in Fig. 2.3. The student uses the equation p1 = (w x k) / V1 to a value p1 for the density of the modelling clay, where k = 100 g/N. Use your results from (a)(ii) and (a)(iii) to calculate.

Here are the solutions to the questions:

Question 2 (a):

• iii) Record the weight $w$ of the rectangular block of modelling clay shown in Fig. 2.3.

  • Step 1: Read the value from the forcemeter scale. The forcemeter scale shows markings in Newtons (N). The pointer is aligned with the $1.2 \text{ N}$ mark. $$w = \boxed{\text{1.2 N}}$$

• iv) Use your results from (a)(ii) and (a)(iii) to calculate $\rho_1$.

  • Step 1: Recall the values from previous parts. From (a)(ii), the volume $V_1 = 15.0 \text{ cm}^3$. From (a)(iii), the weight $w = 1.2 \text{ N}$. The given constant $k = 100 \text{ g/N}$.
  • Step 2: Substitute the values into the given equation for density $\rho_1$. $$\rho_1 = \frac{w \times k}{V_1}$$ $$\rho_1 = \frac{1.2 \text{ N} \times 100 \text{ g/N}}{15.0 \text{ cm}^3}$$
  • Step 3: Perform the calculation. $$\rho_1 = \frac{120 \text{ g}}{15.0 \text{ cm}^3}$$ $$\rho_1 = \boxed{\text{8.0 g/cm}^3}$$