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3 years ago

15

Two boys wearing roller skates are standing on a smooth surface with the palms of their hands touching and their arms bent, as s

hown above. if boy x pushes by straightening his arms out while boy y holds his arms in the oringinal position, what is the motion of the two boys

1 answer:

vlada-n [284]3 years ago

8 0

Boy X and Boy Y both move backward in opposite directions.

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Two men decide to use their cars to pull a

joja [24]

The net forward force =( 515 cos 31deg ) +( 926 cos 25 deg )
= 441.44N + 839.24 N
= 1280.7N in truck direction

3 0

4 years ago

Read 2 more answers

When 0.1375 g of solid magnesium is burned in a constant-volume bomb calorimeter, the temperature increases by 1.126°C. The heat

Bumek [7]

Answer:

-24.76 kJ/mol

Explanation:

given,

mass of solid magnesium burned = 0.1375 g

the temperature increases by(ΔT) 1.126°C

heat capacity of of bomb calorimeter (C_{cal})= 3024 J/°C

heat absorbed by the calorimeter

$q_{cal} = C_{cal}\DeltaT$

$q_{cal} = 3024 \times 1.126$

$q_{cal} =3405.24\ J$

$q_{cal} =3.405\ kJ$

heat released by the reaction

$q_{rxn} = -q_{cal}$

$q_{rxn} = -3.405\ kJ$

energy density will be equal to heat released by the reaction divided by the mass of magnesium

Energy density = $\dfrac{-3.405}{0.1375}$

Energy density = -24.76 kJ/mol

heat given off by burning magnesium is equal to -24.76 kJ/mol

6 0

3 years ago

Determine the centripetal force upon a 40-kg child who makes 10 revolution around the cliffhanger in 29.3 seconds.the radius of

zysi [14]

Answer:

The centripetal force acting on the child is 39400.56 N.

Explanation:

Given:

Mass of the child is, $m=40\ kg$

Radius of the barrel is, $R=2.90\ m$

Number of revolutions are, $n =10$

Time taken for 10 revolutions is, $t=29.3\ s$

Therefore, the time period of the child is given as:

$T=\frac{n}{t}=\frac{10}{29.3}=0.341\ s$

Now, angular velocity is related to time period as:

$\omega=\frac{2\pi}{T}=\frac{2\pi}{0.341}=18.43\ rad/s$

Now, centripetal force acting on the child is given as:

$F_{c}=m\omega^2 R\\F_{c}=40\times (18.43)^2\times 2.90\\F_{c}=40\times 339.66\times 2.90\\F_{c}=39400.56\ N$

Therefore, the centripetal force acting on the child is 39400.56 N.

8 0

3 years ago

Water ______________ easier in the mountains because there is less air pressure.

Alchen [17]

<h3>Answer: 1) Boils</h3>

The less air pushing down on the water effectively allows the water to boil easier. Think of the water molecules as a bunch of marbles bouncing around in a box with a lid. The less air pressure means the lid is easier to open from the force exerted by the bouncing marbles, allowing those particles to escape and turn into gas.

So in short, if you are in the mountains, then it'll take less time to cook food because water comes to a boil faster.

3 0

3 years ago

Drag racing cars are very elongated with the front wheels placed very far away from the rear wheels. This placement helps keep t

anygoal [31]

Answer:

Explanation:

Now for this kind of phenomena in which drag cars are very elongated with front wheels placed far away from the rear wheels resulting in keeping the car front end from nosing upward,this is due to the reason because it helps in shifting the center of mass towards the front.

Hence when the car accelerates

torque due to gravity = torque due to air friction

8 0

3 years ago