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4 years ago

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A woman lifts her 100-N child up one meter and carries her for a distance of 50m tl the childs bedroom . How muchwork does the w

omando?

1 answer:

BlackZzzverrR [31]4 years ago

6 0

The Definition of Work is given by:

$T=F\Delta S$

Entering the unknowns, we have:

$T=F\Delta S \\ T=100*50 \\ \boxed {T=5*10^3J}$

If you notice any mistake in my english, please let me know, because i am not native.

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The angle between the two force of magnitude 20N and 15N is 60 degrees (20N force being horizontal) determine the resultant in m

BARSIC [14]

A) The resultant force is 30.4 N at $25.3^{\circ}$

B) The resultant force is 18.7 N at $43.9^{\circ}$

Explanation:

A)

In order to find the resultant of the two forces, we must resolve each force along the x- and y- direction, and then add the components along each direction to find the components of the resultant.

The two forces are:

$F_1 = 20 N$ at $0^{\circ}$ above x-axis

$F_2 = 15 N$ at $60^{\circ}$ above y-axis

Resolving each force:

$F_{1x}=F_1 cos \theta = (20)(cos 0)=20 N\\F_{1y}=F_1 sin \theta =(20)(sin 0)=0 N$

$F_{2x}=F_2 cos \theta = (15)(cos 60)=7.5 N\\F_{2y}=F_2 sin \theta =(15)(sin 60)=13.0 N$

So, the components of the resultant are:

$F_x = F_{1x}+F_{2x}=20+7.5 = 27.5 N\\F_y = F_{1y}+F_{2y}=0+13.0=13.0 N$

And the magnitude of the resultant is:

$F=\sqrt{F_x^2+F_y^2}=\sqrt{27.5^2+13.0^2}=30.4 N$

And the direction is:

$\theta=tan^{-1}(\frac{F_y}{F_x})=tan^{-1}(\frac{13.0}{27.5})=25.3^{\circ}$

B)

In this case, the 15 N is applied in the opposite direction to the 20 N force. Therefore we need to re-calculate its components, keeping in mind that the angle of the 15 N force this time is

$\theta=180^{\circ}-60^{\circ}=120^{\circ}$

So we have:

$F_{2x}=F_2 cos \theta = (15)(cos 120)=-7.5 N\\F_{2y}=F_2 sin \theta =(15)(sin 120)=13.0 N$

So, the components of the resultant this time are:

$F_x = F_{1x}+F_{2x}=20-7.5 = 12.5 N\\F_y = F_{1y}+F_{2y}=0+13.0=13.0 N$

And the magnitude is:

$F=\sqrt{F_x^2+F_y^2}=\sqrt{13.5^2+13.0^2}=18.7 N$

And the direction is:

$\theta=tan^{-1}(\frac{F_y}{F_x})=tan^{-1}(\frac{13.0}{13.5})=43.9^{\circ}$

Learn more about vector addition:

brainly.com/question/4945130

brainly.com/question/5892298

#LearnwithBrainly

7 0

3 years ago

You push a 23kg cradle to the left of you, giving it an initial speed 1.85 m/s. the cradle comes to rest with a constant acceler

Vadim26 [7]

Do your work stop cheating

5 0

3 years ago

Name three types of energy that exist in a large piece of charcoal on a grill in the sunlight. Explain why the charcoal has each

zloy xaker [14]

Answer:

* thermal energy

potential energy,

potential energy

Explanation:

The ship has various types of energy,

* thermal energy. This energy is associated with the temperature of the coal, the hotter the greater its internal energy,

* potential energy this energy is stored in the constituent atoms within carbon

* potential energy. It is due to the configuration of the system, in this case the sun heats the coal

5 0

3 years ago

A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 1.90 s. You may ignore air

Gekata [30.6K]

Answer: Height of building = 17.69m, velocity of brick = 18.6m/s

Explanation: From the question, the body has a zero initial speed, thus initial velocity (u) all through the motion is zero.

By ignoring air resistance makes it a free fall motion thus making it to accelerate constantly with a value of $a = 9.8m/s^{2}$ .

Time taken to fall = 1.90s

a)

thus the height of the building is calculated using the formulae below

$H = ut + \frac{1}{2} gt^{2}$

but u = 0 , hence

$H = \frac{1}{2} gt^{2}$

$H = \frac{1}{2} *9.8* 1.9^{2} \\\\H = 17.69m$

b)

to get the value of velocity (v) as the brick hits the ground, we use the formulae below

$v^{2} = u^{2} + 2aH$

but u= 0, hence

$v^{2} = 2gH\\$

$v^{2} = 2 * 9.8 * 17.69\\v = \sqrt{2 *9.8* 17.69} \\v = 18.62m/s$

find the attachment in this answer for the accleration- time graph, velocity- time graph and distance time graph

8 0

4 years ago

Help pls and thank you PLEASE NO LINKS

AveGali [126]

Answer: mutation

explanation: no other species of its kind will have this mutation

4 0

3 years ago

Read 2 more answers