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3 years ago

If two arm wrestlers exert a force on each other’s hands, and the hands don’t move, the forces must be *

1 answer:

3 0

Balanced. They’re equally as strong so as their arm wrestling, neither of the men’s hands go down. Because they’re equally/balanced as strong.

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When a fan is turned on it changes electrical energy into what?

ankoles [38]

When you turn on a fan its electrical energy changes into kinetic energy

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3 years ago

A 56 kg woman climbs the stairs to a height of 5 m. Determine: a) what mechanical work

Aleonysh [2.5K]

Answer:

a) W = 2746.8[J]

b) W = 2992.05 [J]

Explanation:

Work is defined as the product of force by distance. We must bear in mind that the force that performs the work is the one that acts in the same direction of displacement.

For this case, we must calculate the weight of the woman, the weight is defined as the product of mass by gravity.

$w=m*g\\$

where:

w = weight [N] (units of Newtons]

m = mass = 56 [kg]

g = gravity acceleration = 9.81 [m/s²]

$w=56*9.81\\w=549.36[N]$

$W=F*d$

where:

F = weight = 549.36[N]

d = distance = 5 [m]

$W = 549.36*5\\W = 2746.8[J]$

The new mass will be the combination of the mass of the woman plus that of the load.

$m_{new} = 56+5\\m_{new}=61[kg]$

$w_{new}=61*9.81\\w_{new}=598.41[N]$

The new work done.

$W =598.41*5\\W=2992.05[J]$

4 0

3 years ago

Consider two massless springs connected in parallel. Springs 1 and 2 have spring constants k1 and k2 and are connected via a thi

77julia77 [94]

Answer:

k1 + k2

Explanation:

Spring 1 has spring constant k1

Spring 2 has spring constant k2

After being applied by the same force, it is clearly mentioned that spring are extended by the same amount i.e. extension of spring 1 is equal to extension of spring 2.

x1 = x2

Since the force exerted to each spring might be different, let's assume F1 for spring 1 and F2 for spring 2. Hence the equations of spring constant for both springs are

k1 = F1/x -> F1 =k1*x

k2 = F2/x -> F2 =k2*x

While F = F1 + F2

Substitute equation of F1 and F2 into the equation of sum of forces

F = F1 + F2

F = k1*x + k2*x

= x(k1 + k2)

Note that this is applicable because both spring have the same extension of x (I repeat, EXTENTION, not length of the spring)

Considering the general equation of spring forces (Hooke's Law) F = kx,

The effective spring constant for the system is k1 + k2

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3 years ago

Which is an example of an object acquiring a charge through friction?

tamaranim1 [39]

<span>C. As a metal comb is held near an object with a negative charge, the comb becomes charged.
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3 years ago

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which processes might contribute to the addition of pollutants to rivers, lakes and oceans?how do these processes contribute

n200080 [17]

Answer:

Explanation:

8. Which process(es) of the water cycle—precipitation, evaporation, condensation, runoff, percolation or transpiration-might contribute to the addition of pollutants to rivers, lakes, and oceans? Why? Precipitation and runoff would be the most responsible processes.

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3 years ago