Let's break down the physics problem shown in the image. Here's what we have:

• Mass of the box (m) = 0.450 kg
• Spring compression length (x) = 0.198 m
• Spring constant (k) = 1350 N/m
• Inclined plane length (d) = 1.65 m
• Angle of the incline (θ) = 42.5°
• Maximum height (H) = 3.25 m
• Coefficient of friction (μ) = ?

Step 1: Energy Conservation

The system involves energy transformation:

1. Spring potential energy (initial) converts to:
   • Kinetic energy (at the end of the incline),
   • Work done against friction, and
   • Gravitational potential energy at the top.

The initial energy stored in the spring is: $E_{\text{spring}} = \frac{1}{2} k x^2$

Substituting the known values: $E_{\text{spring}} = \frac{1}{2} \times 1350 \, \text{N/m} \times (0.198 \, \text{m})^2$ $E_{\text{spring}} \approx 26.44 \, \text{J}$

Step 2: Energy at the Top of the Incline

At the top of the incline, the box has kinetic energy and has lost some energy due to friction. The kinetic energy can be found from the vertical height $H = 3.25 \, \text{m}$.

Using the conservation of energy: The total mechanical energy at the top (as a projectile) is all potential energy: $E_{\text{potential}} = m g H$ Substitute the known values: $E_{\text{potential}} = 0.450 \, \text{kg} \times 9.81 \, \text{m/s}^2 \times 3.25 \, \text{m}$ $E_{\text{potential}} \approx 14.34 \, \text{J}$

Step 3: Work Done by Friction

The remaining energy loss is due to friction, and we can calculate the work done by friction as: $W_{\text{friction}} = \mu m g \cos(\theta) \times d$

Let’s call the frictional force work as $W_{\text{friction}}$. Now we write the energy balance equation:

$E_{\text{spring}} = E_{\text{potential}} + W_{\text{friction}}$

Rearranging for $W_{\text{friction}}$: $W_{\text{friction}} = E_{\text{spring}} - E_{\text{potential}}$ $W_{\text{friction}} = 26.44 \, \text{J} - 14.34 \, \text{J}$ $W_{\text{friction}} = 12.10 \, \text{J}$

Step 4: Solve for Coefficient of Friction $\mu$

Now, solve for $\mu$ using the equation for the work done by friction: $12.10 \, \text{J} = \mu \times 0.450 \, \text{kg} \times 9.81 \, \text{m/s}^2 \times \cos(42.5^\circ) \times 1.65 \, \text{m}$

Simplifying the right-hand side: $12.10 = \mu \times 6.73$

Solving for $\mu$: $\mu = \frac{12.10}{6.73} \approx 0.18$

Conclusion:

The coefficient of friction $\mu$ is approximately 0.181, which corresponds to the first option.

Would you like more details or have any questions about the steps?

Follow-up Questions:

1. How is the spring potential energy calculated?
2. What role does the angle of the incline play in calculating friction?
3. How does the height $H$ influence the energy transformation?
4. Could the coefficient of friction change if the incline angle changes?
5. How would the result differ if there were no friction?

Tip:

Always make sure to check units carefully in energy conservation problems to avoid calculation errors!