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.
I know of two reasons. I'm sure there are more.
#1). No chemical process can account for the distribution of energy
that we see coming from the sun. I mean the portions of the total
that are radio waves, heat waves, light waves, x-rays, and gamma rays.
#2). A pile of the most energetic known chemicals, with the mass
and volume of the sun, in the process of reactions and emitting
energy, would have been burned out, all over and done with, long ago.
I read somewhere many years ago that a pile of coal the size of
the sun could burn for 160 years. Even if it were ten million times
as long as that, it would still be way short of the 4.6 billion years
that the Earth has existed.
Aster's final position from her initial position is 63 m approximately. She will head north west direction to return to her initial position
<h3>
What is Displacement ?</h3>
Displacement is the distance travelled in a specific direction. It is a vector quantity.
Given that a person walks first 70 m in the direction 37° north of east, and then walks 82 m in the direction 20° south of east, and finally walks 28 m in the direction 30° west of north.
a) Let P be the Aster's final position from her initial position?
We can use bearing by using Cosine formula to solve this question.
P² = 70² + 82² - 2 × 70 × 82 cos 73
P² = 4900 + 6724 - 11480 cos 73
P² = 11624 - 3356.43
P² = 8267.57
P = √8267.57
P = 90.9 m
P = 90.9 - 28
P = 62.9 m
We can get the angle by using Sine rule
82/ sin Ф = 90.9 / sin 73
sin Ф = 0.8627
Ф = (0.8627)
Ф = 59.6°
Ф = 60°
b) She will head north west direction to return to her initial position
Learn more about Displacement here: brainly.com/question/2109763
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Strange as it may seem, that's true. (choice 'a'.)
"Acceleration" doesn't mean "speeding up". It means ANY change in
the speed or direction of motion. So a car with the brakes applied
and slowing down, and a point on the rim of a bicycle wheel that's
turning at a constant rate, are both accelerating.
Weight is a force and it depends on gravity ( so your weight on moon is not the same as on earth)
On earth:
W = mg = 1200 x 9.8 = 11760 N