Answer:
a. It always points perpendicular to the contact surface.
Explanation:
"Normal" means perpendicular. Normal forces are always perpendicular to the contact surface.
Answer: An IR remote (also called a transmitter) uses light to carry signals from the remote to the device so it can be controlled. It emits pulses of invisible infrared light that correspond to specific binary codes. These codes represent commands, such as power on, volume up, or channel down.
Explanation:
1. ability to be pounded into shapes
2. how well a substance flows
3. the mass divided by its volume
4. degree of smoothness
5. ability to dissolve in another substance
6. how shiny a material is
7. ability to be pulled into a wire
Its been some time so i might be wrong but i think the answer is 3 either or 2