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3 years ago

The density of solid copper is 8960 kg/m3.

Physics

1 answer:

Ahat [919]3 years ago

3 0

Explanation:

The density of a solid copper is 8960kg/m^3 while the density of a molten copper is 7900kg/m^3 this is due to the difference in the state of matter, the solid copper is in solid state while the molten copper is in form of a liquid. In the solid copper atoms are tightly pack while they atom are not tightly packed.

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Four forces act on bolt A as shown; F1 150N, F2 80N, F3 110N and F4 100N. Determine the magnitude and direction of the resultant

netineya [11]

Complete Question

The complete question(reference (chegg)) is shown on the first uploaded image

Answer:

The magnitude of the resultant force is $F = 199.64 \ N$

The direction of the resultant force is $\theta = 4.1075^o$ from the horizontal plane

Explanation:

Generally when resolving force, if the force (F )is moving toward the angle then the resolve force will be $Fcos(\theta )$ while if the force is moving away from the angle then the resolved force is $Fsin (\theta )$

Now from the diagram let resolve the forces to their horizontal component

$\sum F_x = 150 cos(30) + 100cos(15) -80sin (20)$

$\sum F_x = 199.128 \ N$

Now resolving these force into their vertical component can be mathematically evaluated as

$\sum F_{y} = 150 sin(30) - 100sin(15) -110 +80 cos(20)$

$\sum F_{y} = 14.30$

Now the resultant force is mathematically evaluated as

$F = \sqrt{F_x^2 + F_y^2}$

substituting values

$F = \sqrt{199.128^2 + 14.3^2}$

$F = 199.64 \ N$

The direction of the resultant force is evaluated as

$\theta = tan^{-1}[\frac{F_y}{F_x} ]$

substituting values

$\theta = tan^{-1}[\frac{ 14.3}{199.128} ]$

$\theta = 4.1075^o$ from the horizontal plane

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4 years ago

Two identical cars are driving in opposite directions at the same speed. their kinetic energies have ____.

Minchanka [31]

The equation for determining the kinetic energy of the system is,

KE = 0.5mv²

where m is the mass, v is velocity and KE is the kinetic energy. When both objects have the same mass, and velocity but different direction, they will have the same kinetic energy.

This is because the exponent in the velocity is squared cancelling out the effect of the sign appearing before the number.

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4 years ago

In a car collision, is it better for the passenger if the change in momentum is over a short period of time or a long period of

e-lub [12.9K]

Explanation:

The force on the passenger will be F = ma

Here, m does not change, but a is the variable.

If the cars slows down very fast, the acceleration will be higher, and thus the force will be higher.

If the acceleration is lower, the force will be lower as well, which would be the most desirable scenario for the passenger.

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3 years ago

How does the way that matter cycles through an ecosystem differ from the way that energy flows?

guapka [62]

Unlike the one-way flow of energy, matter is recycled within and between ecosystems. Every living organism needs nutrients to build tissues and carry out essential life functions.

7 0

4 years ago

The Indianapolis speedway consists of a 2.5 mile track having four turns, each 0.25 mile long and banked at 9 12'

blsea [12.9K]

Answer: Your question is missing below is the question

Question : What is the no-friction needed speed (in m/s ) for these turns?

answer:

20.1 m/s

Explanation:

2.5 mile track

number of turns = 4

length of each turn = 0.25 mile

banked at 9 12'

<u>Determine the no-friction needed speed </u>

First step : calculate the value of R

2πR / 4 = πR / 2

note : πR / 2 = 0.25 mile

∴ R = ( 0.25 * 2 ) / π

= 0.159 mile ≈ 256 m

Finally no-friction needed speed

tan θ = v^2 / gR

∴ v^2 = gR * tan θ

v = √9.81 * 256 * tan(9.2°) = 20.1 m/s

8 0

3 years ago