Answer:
Assumption: the acceleration of this vehicle is constant until it comes to a stop.
Acceleration: .
The acceleration of this vehicle is negative because the velocity of this vehicle is decreasing over time.
Explanation:
- Let denote the initial velocity of this vehicle. .
- Let denote the final velocity of this vehicle. as the vehicle has come to a stop.
- Let denote the displacement of this vehicle. .
- Let denote the acceleration of this vehicle. The value of needs to be found.
Assume that the acceleration of this vehicle, , is constant. The SUVAT equations would apply.
The time required for braking is neither given nor required. Hence, make use of the SUVAT equation to relate , , , and .
Rearrange this equation to find an expression for , the acceleration of this vehicle:
.
- When the rate of change of a value is greater than , that value would become larger over time.
- When the rate of change of a value is equal to , that value would be constant.
- When the rate of change of a value is smaller than , that value would become smaller over time.
Acceleration is the rate at which velocity changes over time.
The velocity of the vehicle in this question is getting smaller over time. Hence, the rate of change of the velocity of this vehicle (that is, the acceleration of this vehicle) would be a negative number.
Answer:
8. Convection
9. Heat (Radiation)
10. Between -210 and -196
11. Vacuum
12. Infrared
13. Convection
14. Unit Joule or British thermal unit and calorie are used too
15. (I don't understand what's being asked here)
Hope this Helps you
Did 1-7 need answers? or no?
Increasing the pressure of gas is like exactly the same as increasing its concentration. If you have a given mass of gas, the way you increase its pressure is to squeeze it into a smaller volume.
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Based on the direction of propagation compared to direction of vibration, waves are classified into:
1- Transverse waves: The direction of propagation of the wave is perpendicular to the direction of vibration of the medium particles.
2- Longitudinal waves: The direction of propagation of the wave is the same as the direction of vibration of the medium particles.
For the question we have here, since the direction of the wave is the same as the direction of vibration of particles, therefore, this wave is a longitudinal wave