psc3 054 06426 September 2012 ☈ Name:

1. Data was gathered for a pulley system with five lines holding up the load.
   
   __________ What is the actual mechanical advantage for the pulley system?
2. _______ What is the ideal mechanical advantage for a pulley system with five load lines?
3. _______ What is the efficiency of the pulley system?
4. __________ The block and tackle on the crane we viewed in the parking lot had four load lines. What is the estimated Mechanical Advantage for the crane based on their being four load lines?
5. __________ _____ If the crane with the four load line block and tackle lifts a steel beam with a mass of 800 kg, how much force will the lift motor have to produce?
6. _____________ Which of Newton's laws says that once moving, an RipStik continues to move at a constant velocity without any further swizzling (wiggling)?
7. _____________ Which of Newton's law governs the accelerating motion of a swizzled (wiggled) RipStik?
8. _____________ A RipStick was accelerated from a velocity of 0 m/s to 1.5 m/s in three seconds by a 52 year old instructor with a mass of 63 kilograms. Calculate the force that generated the acceleration.
9. What does Newton's first law say?
10. What does Newton's third law say?
11. For the following three pulley systems, write down the ideal mechanical advantage for each system:
    
12. Temperatures
    • _________°C What is the temperature of a mix of melting ice and water in Celsius?
    • _________°C What is the temperature of melting solid coconut oil in Celsius?
    • _________°C What is the typical daily room temperature in Pohnpei in Celsius?
    • _________°C What is the temperature of the healthy living human body in Celsius?
    • _________°C What is the temperature of a boiling water in Celsius?
13. In the bubble chart shown the x-axis is the starting temperature in °C, the y-axis is the peak temperature in °C and the size of the bubble is proportional to the change in temperature Δ°C. The larger the temperature change, the larger the bubble.
    
    
    _____________ Based on the bubble chart, which material is the best conductor?
14. _____________ Based on the bubble chart, which material is the best insulator?

$\text{slope m}=\frac{(\mathrm{y2}-\mathrm{y1})}{(\mathrm{x2}-\mathrm{x1})}$
$a=\frac{\Delta ѵ}{\Delta t}$
ѵ = at
$\text{Force}=\Delta \text{momentum}$
$\text{Force}=\text{mass}\times \frac{\Delta ѵ}{\Delta t}$
$\text{Force}=\text{mass}\times \text{acceleration}$
$\text{efficiency}=\frac{\text{actual mechanical advantage}}{\text{ideal mechanical advantage}}$