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Ad libitum [116K]
2 years ago
12

Which type of surface is best for absorbing sound waves?

Physics
2 answers:
sergiy2304 [10]2 years ago
6 0

I think it's B (foam) it may not be though

weeeeeb [17]2 years ago
4 0
I believe it is D) foam
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A 62.00 kg person in a 33.00 kg cart is coasting with a speed of 15 m/s before it goes up a hill.
frozen [14]

Answer:

11.47 m high

Explanation:

All of the Kinetic Energy converts to Potential energy

1/2 m v^2 = mgh      divide both sides by 'm'

1/2 v^2 = gh                (note that the masses given are irrelevant !)

(1/2 v^2) / g = h

(1/2 (15^2) / 9.81 = h     = 11.47 m

4 0
2 years ago
Pertaining to simple machines and levers what changes when the fulcrum position is modified?
Inessa [10]

Explanation :

There are many types of simple machines i.e. lever, wedge, pulley, wheel and axle etc.

Fulcrum is the pivot point about which the lever turns. When the position of the fulcrum is shifted, the position of effort changes.

There are three classes of the lever as class 1, class 2 and class 3.

Class 1 includes seesaws and scissors.

class 2 includes wheelbarrow

class 3 includes tongs and tweezers.

7 0
3 years ago
Describe in your own words, What is insulation?
serg [7]
Insulators are the materials that are bad conductors of heat/electricity.insulation is tge pricess of covering any thing with such materials in order to prevent heat or electricity.
6 0
3 years ago
A 20-kg child is coasting at 3.3 m/s over flat ground in a 4.0-kg wagon. The child drops a 1.0-kg ball out the back of the wagon
Shalnov [3]

Answer:

The final velocity is u_f = 3.44 \  m/s

Explanation:

From the question we are told that

    The mass of the child is  m_1 = 20 \  kg

    The initial  speed  of the child is  u_1 = 3.3 \  m/s

    The mass of the wagon is  m_w =  4.0 \ kg

    The  initial  speed of the wagon is u_w = 3.3 \ m/s

    The mass of the ball is  m_2 = 1.0 \  kg

    The initial speed off the ball  is  u_2 = 3.3 \ m/s

Generally the initial  speed of the system (i.e the child , wagon ,  ball) is  

          u_1 = u_w = u_2 = u =3.3 \ m/s

Generally from the law of linear momentum conservation

    p_i = p_f

Here p_i  is the momentum of the system before the ball is dropped which is mathematically represented  as

      p_i = ( m_1 + m_2 + m_3 ) *  u

=>   p_i = ( 20  + 4 + 1 ) *  3.3

=>   p_i = 82.5 \ kg \cdot m/s

and  

       p_f  is the momentum of the system after the ball is dropped which is mathematically represented  as  

       p_f = ( m_1 + m_w ) *  u_f

=>   p_i = ( 20  + 4 ) *  u_f

So

     82.5 = 24 * u_f

=>   u_f = 3.44 \  m/s

   

4 0
3 years ago
Look at this model of an atom. Using a periodic table, which element does it represent?
Elodia [21]

Answer:

Nitrogen

Explanation:

5 0
3 years ago
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