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Naya [18.7K]
3 years ago
10

Define average velocity.Immersive Reader

Physics
1 answer:
vagabundo [1.1K]3 years ago
4 0

Answer:

The slope of a graph of position vs time

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Two platoons line up for a tug of war. If both platoons have the same number of participants on a team, what other factor is cri
Serga [27]
The best answer is C) total mass of the team. 

In tug of war, the mass of each team is a critical factor in determining which side wins. The team with greater mass will require greater force to move, and also is likely able to exert greater force on the other team due to the correlation between strength and mass. 
6 0
3 years ago
Read 2 more answers
A bead slides without friction around a loop the-loop. The bead is released from a height of 17.6 m from the bottom of the loop-
solong [7]

Answer:

 N₁ = 393.96 N   and  N = 197.96 N

Explanation:

In This exercise we must use Newton's second law to find the normal force. Let's use two points the lowest and the highest of the loop

Lowest point, we write Newton's second law n for the y-axis

          N -W = m a

where the acceleration is ccentripeta

          a = v² / r

           

          N = W + m v² / r

          N = mg + mv² / r

         

we can use energy to find the speed at the bottom of the circle

starting point. Highest point where the ball is released

           Em₀ = U = m g h

lowest point. Stop curl down

           Em_{f} = K = ½ m v²

           Emo = Em_{f}

           m g h = ½ m v²

           v² = 2 gh

we substitute

             N = m (g + 2gh / r)

            N = mg (1 + 2h / r)

let's calculate

          N₁ = 5 9.8 (1 + 2 17.6 / 5)

          N₁ = 393.96 N

headed up

we repeat the calculation in the longest part of the loop

          -N -W = - m v₂² / r

            N = m v₂² / r - W

             N = m (v₂²/r  - g)

we seek speed with the conservation of energy

           Em₀ = U = m g h

final point. Top of circle with height 2r

             Em_{f} = K + U = ½ m v₂² + mg (2r)

              Em₀ =   Em_{f}

            mgh = ½ m v₂² + 2mgr

             v₂² = 2 g (h-2r)

we substitute

            N = m (2g (h-2r) / r - g)

            N = mg (2 (h-r) / r 1) = mg (2h/r  -2 -1)

             N = mg (2h/r  - 3)

            N = 5 9.8 (2 17.6 / 5 -3)

            N = 197.96 N

Directed down

3 0
3 years ago
What energy is used for a gas powered scooter
ValentinkaMS [17]

Answer:

fuel gas

Explanation:

6 0
2 years ago
3. Name four examples of:<br>(a) mixtures<br>(b) compounds<br>(c) elements​
Anika [276]

Answer:

examples of mixture: smoke,fog,sand, potassium nitrate, sulfur and carbon.

examples of compounds: mithane, ammonia,salt and nitrous oxide.

examples of elements: hydrogen , helium, oxygen and neon.

Explanation:

there are more elements

4 0
2 years ago
Read 2 more answers
A pendulum of mass 18 kg is released from rest at some height, as shown by
valentinak56 [21]

By the work-energy theorem, the total work done on the mass as it swings is

<em>W</em> = ∆<em>K</em> = 1/2 (18 kg) (17 m/s)² = 153 J

No work is done by the tension in the string, since it's directed perpendicular to the mass at every point in the arc. Similarly, the component of the mass's weight <em>mg</em> pointing perpendicular to the arc also performs no work.

If we ignore friction/drag for the moment, the only remaining force is the parallel component of weight, which performs <em>mgh</em> = (176.4 N) <em>h</em> of work, where <em>h</em> is the vertical distance between points A and B.

Now, if <em>w</em> is the amount of work done by friction/air resistance, then

(176.4 N) <em>h</em> - <em>w</em> = 153 J

If you know the starting height <em>h</em>, then you can solve for <em>w</em>.

8 0
2 years ago
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