Answer:
joule
Explanation:
Let m = mass of the car and v1 = initial velocity and v2 = final velocity
Given.
Initial velocity = 100 km/h
final velocity = 50 km/h
What is work done in the car to slow it from 100km/h to 50km/h?
The work done in the car to slow it from v1 to v2.
w=Δk
joule.
Therefore, the work done is joule
Answer: C. good reflector of heat
Explanation:
In space, sunlight transfers heat by radiation to objects and bodies and this includes satellites and astronauts. In addition, although the peak of the sun's emission is in the visible region of the electromagnetic spectrum, a part is also emitted in infrared (transferring thermal energy or heat) and ultraviolet (especially in the upper part of the Earth's atmosphere).
That is why in space missions, objects and many satellites are covered by thin layers or sheets that reflect this thermal energy and thus avoid damaging the equipment due to high temperatures.
In this sense, among the reflective materials used are aluminum, silver, copper and gold; the latter being the most used because it does not corrode or oxidize (unlike silver and copper) and is more malleable than aluminum.
On the other hand, <u>astronauts are also vulnerable to the effects of infrared radiation, especially their eyes</u>, since the human eye has no receptors in the infrared spectrum. <u>That is why the astronaut's helmet visor is covered with a thin layer of gold to avoid the dangerous effects of solar radiation.</u>
Subjective refers to something that takes place within the mind of the person. It is modified based on individual bias.
Objective refers to defining things or expressing them without any distortion. They are expressed only as perceived.
Finally, mineral is anything composed of matter apart from animals and plants.
Its acceleration will be 0.825 m/s²
What is Acceleration ?
Acceleration is the rate of change of velocity. It is measured in m/s²
Given that a car is driving 8.5 m/s, and speeds up to 11.8 m/s over a period of 4 seconds.
The parameters to consider are;
- Initial velocity u = 8.5 m/s
- Final velocity v = 11.8 m/s
a = Δv ÷ t
a = (v - u) / t
a = (11.8 - 8.5) / 4
a = 3.3 / 4
a = 0.825 m/s²
Therefore, its acceleration will be 0.825 m/s²
Learn more about Acceleration here: brainly.com/question/14344386
#SPJ1
Deep in the ocean bahubsi h aj s h shs. hha s hva s hhs s hhs s
