3 years ago

Which statement best describes the thermal properties of wool?

1 answer:

3 0

<span>i believe the answer is
D. Wool is an excellent thermal insulator because heat flows through it very slowly.</span>

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A 0.2-kg steel ball is dropped straight down onto a hard, horizontal floor and bounces straight up. The ball's speed just before

nadya68 [22]

Answer:

Explanation:

Given

mass of steel ball $m=0.2\ kg$

initial speed of ball $u=10\ m/s$

Final speed of ball $v=-10\ m/s$ (in upward direction)

Impulse imparted is given by change in the momentum of object

therefore impulse J is given by

$J=\Delta P$

$\Delta P=m(v-u)$

$\Delta P=0.2(-10-10)$

$\Delta =-4\ N-s$

so magnitude of Impulse =4 N-s

7 0

2 years ago

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Some people say you can get HIV from insect bites. True or false? Why?

Murljashka [212]

The answer is False because HIV spreads through contact between HIV-infected blood or blood-contaminated body fluids and broken skin, wounds, or mucous membranes. Deep, open-mouth kissing if both partners have sores or bleeding gums and blood from the HIV-positive partner enters the HIV-negative partner's bloodstream.

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2 years ago

Name two things that the people standing on the street corner would say are in motion

timurjin [86]

People, and cars
is the right answer!!!!!!!!!!!!!!!!!!!!!!!!!!

8 0

3 years ago

A Cassegrain telescope

yuradex [85]

The answer is D.

Hope this helps and have a good day :D

3 0

2 years ago

In order to make a ramp that is 3ft high and covers4ft of ground how long must the ramp be

Murljashka [212]

This seems like a right angle triangle situation
the height is 3ft
the base is 4ft
so we're looking for the hypothenus
so we can use the Pythagoras Theorem
which is
the square of the hypothenus is equal to the sum of the square of the two other sides
hyp^2 is equal to opp^2+ adj^2
hyp^2 equals to 3^2 + 4^2
9+16
25
hyp^2 equals to 25
$\sqrt{25}$
equals to 5
the ramp has to be 5ft long

6 0

3 years ago