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3 years ago

A rower in a boat pushes the water using an oar.

Physics

2 answers:

brilliants [131]3 years ago

6 0

Answer:

It's B, because of process of elimination:

A: The rower would be applying force to the oar not the other way around. So that's immediately out.

C: If the force of the oar applies to the water, the force of the water cannot apply to the oar.

D: Same as why A is incorrect.

So B is the only one left.

solong [7]3 years ago

6 0

The correct answer is B. “Every action has an equal or opposite reaction”.

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Determine the electrical and gravitational forces that two protons in the nucleus of a helium atom exert on each other when sepa

jonny [76]

Answer:

Fe = 25.67 N

Fg = 2.0734 x 10^-35 N

Explanation:

r = 3 x 10^-15 m

G = 6.67 x 10^-11 Nm^2/kg^2

Mp = 1.6726231 x 10^-27 kg

Qp = 1.6021 x 10^-19 C

K = 9 x 10^9 Nm^2/C^2

The formula for the electrical force between the two protons is given by

$F = K \frac{Q_{p}\times Q_{p}}{r^{2}}$

$F = \frac{9\times 10^{9}\times 1.6021\times 10^{-19}\times 1.6021\times 10^{-19}}{3\times 10^{-15}\times 3\times 10^{-15}}$

Fe = 25.67 N

The formula for the gravitational force between the two protons is given by

$F = G \frac{M_{p}\times M_{p}}{r^{2}}$

$F = \frac{6.67\times 10^{-11}\times 1.6726231\times 10^{-27}\times 1.6726231\times 10^{-27}}{3\times 10^{-15}\times 3\times 10^{-15}}$

Fg = 2.0734 x 10^-35 N

4 0

4 years ago

Spiral fracture of bone: Spiral fracture of bone occurs due to twisting of the limb, and is a very common skiing accident. The f

Pavlova-9 [17]

Answer:

principal stresses :б1 = 32.62mPa б2 = 31.38mPa

Max Shear stress : 16.31 mPa

Orientation of max principle plane = 44.43°

Orientation of minimum principal plane = 134.43°

Explanation:

Given data:

Torque = 50 N-m

weight = 80 kgs

half of weight is subjected to each leg

radius of bone = 10 mm = 0.010 m

<u>a) Determine the principal stresses and shear stress</u>

first calculate the max shear stress ( this will occur in the outermost element

= 16T / π*d^3 where : T = 50 , d = 0.020 m

hence max shear stress = 32 mPa

next determine compressive stress

= ( 40*g) / π/4*d^2 . where : d = 0.020 m , g = 9.81

hence compressive stress = 1.24 mPa

draw and calculate the radius of Mohr's circle

radius of Mohr's circle = 32.0060

Hence principal stresses = 32.0060 ± 0.62

б1 = 32.62mPa

б2 = 31.38mPa

attached below is the remaining part of the solution

3 0

3 years ago

1. Identify the significance of the following terms to the subject of the Civil War.

DanielleElmas [232]

What following terms I don’t see any please make your question clear

4 0

4 years ago

David drove 70 miles in the first 1 ¾ hours of his trip. how much longer should it take him to drive an additional 120 miles if

steposvetlana [31]

Let us first calculate the average speed of David,

Av speed = Distance traveled/ Time taken

We have, distance = 70 miles

Time = $1\frac{3}{4}$ hours = 1.75 hours

Av speed = $\frac{70}{1.75}$

= 40 miles/hour

Another 120 miles will be traveled in time, t = 120/40 = 3 hours

5 0

3 years ago

Find the momentum of a 15 kg object traveling at 7 m/s

S_A_V [24]

<em>Find the momentum of a 15 kg object traveling at 7 m/s.</em>

The momentum of an object is found by using the following formula:

$\displaystyle p=mv$

P is the momentum and is measured in kg · m/s
m is the mass and is measured in kg
v is the velocity and is measured in m/s

In this question, the object is 15 kg and is travelling at 7 m/s. That means the mass is 15 kg and the velocity is 7 m/s.

Since all the needed variables are found, substitute it into the equation:

$\displaystyle p=mv \rightarrow p=15 \times 7$

Multiply:

$\displaystyle p=105\ kg \times m/s$

__________________________________________________________

What is the momentum? 105 kg · m/s

What is the velocity? 7 m/s

What is the mass? 15 kg

What equation did you use to solve? p = mv

__________________________________________________________

7 0

3 years ago