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2 years ago

According to Newton's third law of motion, if you push against a wall, the wall will __________.

2 answers:

8 0

It would be C as the law says "Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object."

Svetach [21]2 years ago

8 0

C push againt you with equal force.

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A 200-mm lever and a 240-mm-diameter pulley are welded to the axle BE that is supported by bearings at C and D. A 860-N vertical

Pachacha [2.7K]

Answer:

A 200mm lever and a 240 mm diameter pulley are welded to the axle BE that is supported by bearings at C and D. If a 860N vertical load is applied at A when the lever is horizontal, determine (a)the tension in the cord, (b)the reactions at C and D. assume that the bearing at D does not exert axial thrust.

see explanation

Explanation:

Part a

The tension in the cord

$\sum M = 0$

860(200) - T(120) = 0

T(120) = 172000

T =1433.33N

The tension in the cord (T) = 1433.33N

Part b

Apply the moment law of equilibrium at point D about y-axis.

$\sum M_D_y = 0$

$C_x = (120)-T(40)= 0$

sustitute 1433.33N for T

$C_x (120)-(1433.33)(40)\\\\C_x (120)=57333.2\\\\C_x=477.78N$

The reaction at C along x-axis 477.78N

Apply the moment law of equilibrium at point D about x-axis

$\sum M_D_z = 0$

$-C_y (120)+860(80+120)=0\\\\-C_y(120)=-17200\\\\y=1433.33N$

The reaction at C along y-axis is 143.33N

Apply the force law of equilibrium along z direction.

$\sum F_z=0$

$C_z=0$

The reaction at C along z-axis is 0N

Apply the force law of equilibrium along x direction.

$\sum F_x=0$

$C_x+D_x+T=0$

substitute 477.78N for $C_x$ and 143.33N for $D_x$

$477.78N+D_x+1433.33N=0\\\\D_x=-1911.11N$

The reaction at D along x-axis is -1911.11 N

Apply the force law of equilibrium along y direction.

$\sum F_y=0$

$C_y+D_y-860=0$

substitute 1433.33 for $C_y$

$1433.33+D_y-860=0\\\\D_y=573.33$

3 0

2 years ago

What can electricty from solar power be used for

Mandarinka [93]

Regular electrical needs such as heat, a/c, appliances, anything that would be used regularly with electricity. Most electrical companies use gas, coal, and other nonrenewable resources to power houses. Solar power is just a renewable way of gathering power from the sun and converting it to electricity.

7 0

2 years ago

Is it true that mproving overall fitness may not be possible for people who have physical limitations.

OleMash [197]

That's not true people that have a broken leg use crutches and the constant lifting of their own body weight will help them gain muscle

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2 years ago

How to find a planet’s gravitational field strength using its radius?

grin007 [14]

The gravitational field strength is approximately equal to 10 N.

Explanation:

Gravitational field strength is the measure of gravitational force acting on any object placed on the surface of the planet. Generally, the mass of the object is considered as 1 kg.

So the gravitational field strength will be equal to the gravitational force acting on the object.

The formula for gravitational field strength is

$g = \frac{F}{m}$

Here g is the gravitational field strength, m is the mass of the object placed on the surface and F is the gravitational force acting on the object.

Since, the mass of any object placed on the surface of earth will be negligible compared to the mass of Earth, so the mass of the object is considered as 1 kg.

Then the g = F

And $F =\frac{GMm}{r^{2} }$

Here G is the gravitational constant, M is the mass of Earth and m is the mass of the object placed on the surface, while r is the radius of the Earth.

$g = F = \frac{6 \times 10^{24} \times 6.67 \times 10^{-11} \times 1}{(6.6 \times 10^{6}) ^{2} }$

$g = 0.977 \times 10^1= 9.77\ N$

So, the gravitational field strength is approximately equal to 10 N.

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2 years ago

Peter is a middle-aged, overweight man who is trying to decrease his body circumference. How could the serving size on a nutriti

gregori [183]

One simple way to losing weight is by calorie counting. Peter can go to his nutritionist and learn just how much calories he can have as intake per day to lose weight. The nutrition label on any food item lists the calories and their serving sizes. This can be used to keep track of how much calories Peter has taken each day, so as to not go over his daily limit.

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2 years ago