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givi [52]
4 years ago
10

A hammer is used to hit a nail into a board. Which statement is correct about the forces at play between the nail and the hammer

? The nail exerts an equal force on the hammer in the same direction. The nail exerts a much smaller force on the hammer in the opposite direction. The nail exerts an equal force on the hammer in the opposite direction. The nail exerts a much smaller force on the hammer in the same direction.
Physics
1 answer:
Studentka2010 [4]4 years ago
3 0

Answer:

The nail exerts an equal force on the hammer in the opposite direction.

Explanation:

The Newtons third law states that there is an equal an opposite reaction for every action. When hammer pushes the nail, the nail will push the hammer back in opposite direction. When the hammer hits a nail then nail will exert the equal and opposite force to the hammer. These both objects will exert force on each other in opposite directions.

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A rocket in deep space has an exhaust-gas speed of 2000 m/s. When the rocket is fully loaded, the mass of the fuel is five times
notka56 [123]

Answer:

 v_{f} = 1,386 m / s

Explanation:

Rocket propulsion is a moment process that described by the expression

       v_{f} - v₀ =  v_{r} ln (M₀ / Mf)

Where v are the velocities, final, initial and relative and M the masses

The data they give are the relative velocity (see = 2000 m / s) and the initial mass the mass of the loaded rocket (M₀ = 5Mf)

We consider that the rocket starts from rest (v₀ = 0)

At the time of burning half of the fuel the mass ratio is that the current mass is    

       M = 2.5 Mf

       v_{f} - 0 = 2000 ln (5Mf / 2.5 Mf) = 2000 ln 2

       v_{f} = 1,386 m / s

3 0
3 years ago
You pull a suitcase along the floor by exerting 43N at an angle. The force of friction is 27 N and the suitcase moves at a const
Mumz [18]

The angle of the force is 51.1^{\circ}

Explanation:

To solve this problem, we can apply Newton's second law along the horizontal direction of motion of the suitcase:

\sum F_x = ma_x

where

\sum F_x is the net force along the x-axis

m is the mass of the suitcase

a_x is the acceleration along the x-axis

The suitcase is moving at constant speed, so the acceleration is zero:

a_x=0

Therefore the net force must also be zero:

\sum F_x = 0 (1)

We have two forces acting along the horizontal direction:

- The component of the push (forward) in the horizontal direction, F cos \theta, with

F = 43 N

\theta = angle of the force with the horizontal

- The  force of friction, F_f = 27 N, backward

So the net force can be written as

\sum F_x = F cos \theta - F_f (2)

Combining (1) and (2),

F cos \theta - F_f = 0

And so we can find the angle:

\theta = cos^{-1}(\frac{F_f}{F})=cos^{-1}(\frac{27}{43})=51.1^{\circ}

Learn more about Newton's second law:

brainly.com/question/3820012

#LearnwithBrainly

8 0
3 years ago
A boat has a speed of 15 mph in still water. it travels downstream from greentown to glenavon in g hours. it then goes back upst
olga2289 [7]
Answer

rate of current = (1/x) mph

Explanation
let the distance from <span>Greentown to Glenavon be y miles and the rate of current be x mph.

y = (15+x)g
y = 15g+gx .........................................(1)

The distance from </span><span>Glenavon to Cambria = (y-2)

y-2 =(15-x)g
y-2 = 15g-gx
y = 15g - gx + 2 ....................... (2)

equation equation (1) and (2)

15g + gx = 15g - gx + 2
2gx = 2

dividing by 2g both sides we get,

x = 1/2g mph
</span>
5 0
4 years ago
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Katena32 [7]

Answer:

D. Plane of orbital rotation

Explanation:

The orbital plane of an object orbiting around another is the geometric plane that contains the orbit in question.

By definition, the inclination of a planet in the solar system is the angle between the orbital plane of the solar system and the orbital plane of the Earth.

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CaHeK987 [17]
I believe that the answer is B
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3 years ago
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