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love history [14]
4 years ago
5

Which statement best describes the thermal properties of wool?

Physics
1 answer:
Evgen [1.6K]4 years ago
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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Katie, a 40 kg child, climbs a tree to rescue her cat who is afraid to jump 9.4 m to the ground. How much work does Katie do to
Diano4ka-milaya [45]

Answer:

The work done by the child to reach the cat is, W = 3684.8 J        

Explanation:

Given data,

The mass of the child, m = 40 kg

The height of the cat from the ground, h = 9.4 m

The force acting on the child due to gravitational force is,

                                  F = mg

The minimum force required by the child to climb the tree against the gravitational force is,

                                 F = mg

Hence, the work done by the child is,

                                W = F ·  h

                                     = 40 x 9.8 x 9.4

                                     = 3684.8 joules

Hence, the work done by the child to reach the cat is, W = 3684.8 J                      

4 0
3 years ago
A capacitor is made by taking two sheets of aluminum foil, each 0.022 mm thick and placing between them a sheet of paper which c
olasank [31]
The answer is 18 nf in this equation
8 0
3 years ago
What is the meaning of painting
AURORKA [14]

Answer:

the process of making or creating art, even using painting as an hobby.

Explanation:

painting!

5 0
3 years ago
Read 2 more answers
Why do baseball pitchers throw the ball at an angle that is slightly above the horizontal if they want the ball to reach at appr
lesantik [10]

Answer:

The angle above the horizontal at which the pitcher throws the ball determines the distance the ball travels before returning to the height at which it was thrown

Explanation:

The baseball is thrown as a projectile and the range, 'R', of the baseball which is the distance the baseball travels before the height above the ground returns to the initial height  is given given as follows;

R = \dfrac{u^2 \cdot sin(2\cdot \theta )}{g}

Where;

R = The range of the baseball = The horizontal distance away from the pitcher the ball reaches

u = The initial velocity with which the baseball was thrown

θ = The angle above horizontal a baseball pitcher throws the ball

g = The acceleration due to gravity ≈ 9.81 m/s²

From the the equation, when θ = 0, sin(θ) = sin(0) = 0 and the ball does not cover any horizontal distance before going lower than the height at which it was thrown, therefore, for the ball to travel further, the angle of launch, θ has to be larger than 0.

4 0
3 years ago
A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7.0 s. what is the average forward force on the car?
Marysya12 [62]

The average force on the car=3857 N

Explanation:

mass of car= 1000 kg

initial velocity= Vi=0

Final velocity= Vf=27 m/s

time= t= 7 s

using the kinematic equation,

Vf= Vi + at

27=0+a (7)

a=3.857 m/s²

Now the force is given by F= m a

F=1000 (3.857)

F=3857 N

8 0
4 years ago
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