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3 years ago

What is the differences between up milling and down milling?

2 answers:

7 0

he difference between down milling and up milling is the directions. When you say down milling, the direction of the cutter is going to the same direction of your feed. While for up milling, the direction of your cutter is going against the feed. The cutter and the feed would go to opposite directions

MAXImum [283]3 years ago

5 0

In up milling the cutter rotates clockwise when cutting the workpiece from right to left. in down milling the cutter rotates clockwise when cutting the workpiece from left to right

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Do two bodies have to be in physical contact to exert a force upon one another?

Mekhanik [1.2K]

The correct answer to the statement " Do two bodies have to be in physical contact to exert a force upon one another " is:

No, the gravitational force is a field force and does not require physical contact to exert

a force.

The correct option is a.

<h3>Why two bodies do not have to be in physical contact to exert a force upon one another as a result of gravitational force.</h3>

It has been practically proven that two bodies can exert a force upon each other even if there is no physical contact between them. This can as a result of gravity.

That being said, a magnetic attraction can also exert a force between two different bodies upon one another.

So therefore, it can be deduced from above that two different bodies do not have to be in physical contact before they exert a force upon one another.

Read more on force:

brainly.com/question/12970081

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3 0

2 years ago

What is the best approximate value for the elastic potential energy (EPE) of the spring elongated by 3.0 meters?

klasskru [66]

P.E=0.0675 J

Explanation:

Elastic potential Energy=Force × distance of displacement

The formula to apply is;

P.E=1/2 ks²

where k is the spring constant given as; 1.5 *10^-2 N/m and s is the displacement

In this case,

s=3

P.E= 1/2 * 1.5 × 10^-2 ×3²

P.E=1.5×10^-2*4.5

P.E=0.0675 J

Learn More

Elastic potential energy:brainly.com/question/1352053

Keywords: approximate,value,elastic potential energy,spring, elongated

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7 0

3 years ago

The velocity v of a particle moving in the xy plane is given by v = (6.0t -4.0t2 )i + 8.5j, in m/s. Here v is in m/s and t (for

atroni [7]

Answer:

Explanation:

Given

Velocity of the particle in vector form is given by

$v=\left ( 6t-4t^2\right )\hat{i}+8.5\hat{j}$

acceleration is rate of change of velocity thus acceleration is

$a=\frac{\mathrm{d} v}{\mathrm{d} t}$

$a=(6-8t)\hat{i}+0\hat{j}$

at $t=3\ s$

$a=6-8\times 3$

$a=-18\ m/s^2$

7 0

4 years ago

An arrow of 43 g moving at 84 m/s to the right, strikes an apple at rest. The arrow sticks to the apple and both travel at 16.8

Aloiza [94]

Answer:

<em>The mass of the apple is 0.172 kg (172 g)</em>

Explanation:

<u>The Law Of Conservation Of Linear Momentum </u>

The total momentum of a system of bodies is conserved unless an external force is applied to it. The formula for the momentum of a body with mass m and speed v is

P=mv.

If we have a system of two bodies, then the total momentum is the sum of both momentums:

$P=m_1v_1+m_2v_2$

If a collision occurs and the velocities change to v', the final momentum is:

$P'=m_1v'_1+m_2v'_2$

Since the total momentum is conserved, then:

P = P'

Or, equivalently:

$m_1v_1+m_2v_2=m_1v'_1+m_2v'_2$

If both masses stick together after the collision at a common speed v', then:

$m_1v_1+m_2v_2=(m_1+m_2)v'$

We are given the mass of an arrow m1=43 g = 0.043 kg traveling at v1=84 m/s to the right (positive direction). It strikes an apple of unknown mass m2 originally at rest (v2=0). The common speed after they collide is v'=16.8 m/s.

We need to solve the last equation for m2:

$m_2v_2-m_2v'=m_1v'-m_1v_1$