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Dmitry [639]
3 years ago
11

Alexandra is attempting to drag her 32.6 kg golden retriever across the wooden floor by applying a horizontal force. What force

must she apply to move the dog with a constant speed of 0.95 m/s? The coefficient of friction between the dog and the floor is 0.72
Physics
1 answer:
vichka [17]3 years ago
7 0

Answer:

230.26 N

Explanation:

Since the speed is constant, acceleration is zero hence the net force will be given by the product of mass, coefficient of friction and acceleration due to gravity

F=0.72*32.6*9.81=230.26 N

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The apparent westward movement of a planet against the background of stars is called
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Answer:

Retrogade Motion

Explanation:

The planet movement is called a retrogade motion meaning that it is moving in an opposite path to the stars.

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If you drive 12 miles north and 35 miles east, what is the direct distance between you and your starting point?
Svetlanka [38]

Answer:

For this, you need the pythagorean theorem, which is a^{2}+ b^{2}= c^{2}

Your a should be 12, and your b should be 35. So now you can solve for c, which equals 37 miles.

So the answer is 37 miles

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Metallic and non-metallic

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5 0
3 years ago
Why it is difficult to run fast in sand​
balu736 [363]
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8 0
3 years ago
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A man plans to use a 2 metre crowbar to lift a rock by putting a pivot 0,8 m from
sp2606 [1]
1.  The man will be able to move the rock.  See diagram.
     Moment of Man's force :  400 N * 1.2 meter  = 480 N-m
       Rock's Weight = 50 Kg * 9.8 m/sec²  = 490 Newtons
     Moment of Rock's weight  : 490 N * 0.80 meters = 392 N-m
    
  <em><u>   Moment of Man's Force is MORE :  480 N-m > 392 N-m</u></em>
<em><u>     So man will be able to lift the rock.</u></em>

2. Let is look at the diagram - second one.
     Let us assume that the fulcrum (Pivot) is placed at X meters from the rock.
     So moment of Girl's force about Pivot =  200 N * (2 - X) meters = 400 - 200 X
         Moment of Rock's weight = 490 N * X = 490 X

     As the Girl is able to lift the rock,  400 - 200 X  >  490 X
       Hence      400 >  200 X + 490 X
                      400 >  690 X
                       X <  400/690  =  0.58 meters
    <u><em> If the Pivot is placed closer than 0.58 meters or 58 cm to the Rock, then </em></u>
<u><em>     she can lift the rock.</em></u>

4 0
3 years ago
Read 2 more answers
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