1.5.2.
Hint.
convert 5’ feet into inch and add them to the 9 inch to get total hight and then use conversion factor 1 inch = 2.54 cm.
Appendix A Selected Hints
1 Scientific Method
1.5 Exercise
1.5.3.
Hint.
convert 1 m into cm and then use conversion factor 1 cm = 10 mm.
3 Energy
3.4 Exercise
3.4.1.
Hint.
Choose one of the following.
- Joule (J)
- Watt (W)
- Newton (N)
3.4.2.
Hint.
Find the relatin between power and velocity.
3.4.3.
Hint.
Use the definition of power.
3.4.4.
Hint.
Find mass of the object from its weight using Newton’s II law and then apply kinetic energy formula to find the speed.
3.4.7.
Hint.
- total momentum of the system remains the same.
- total kinetic energy of the system remains the same
- total kinetic energy of the system decreases
- total kinetic energy of the system increases
6 Waves
6.4 Exercises
6.4.5.
Hint.
White is a combination of all the colors, and black is the absense of all colors. When viewed in the blue light only blue light reflects. The blue parts are not affected, the red parts are black now, and the white parts are blue now.
