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3 years ago

Mention any five uses of simple machines.

Physics

1 answer:

vazorg [7]3 years ago

7 0

Answer:

Inclined Plane - A ramp, for example a wheelchair ramp to help move to another level.

Wheel & Axle - On lawnmowers and wheelbarrow.

Lever - A seesaw

Pulley - adjustable clothesline (think from back then when you would put clothes out to dry them)

Screw - the bottle caps you screw on or off

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A(n) _____ is an area where an individual bird lives.

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Bird habitats include various habitat types: from the human-related environment (e.g., building area, park, rural area, farmland, and pond) to the natural-related environment (e.g., forestland, grassland, river, stream, and coastland).

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3 years ago

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There are four forces acting on a car. The forces are:

Elenna [48]

Answer:

Explanation:

<u>Net Force</u>

The net force vector is the sum of all the force vectors applied to a body.

There are four forces applied to a car:

325N to the north

175N to the south

465N to the east

255N to the west

To simplify the calculations, we find the net force by each axis separately, considering forces to the right and upward as positive.

Fx = 465 N - 255 N = 210 N

Fy = 325 N - 175 N = 150 N

The magnitude of the net force is:

$|Fn|=\sqrt{210^2+150^2}$

$|Fn|=\sqrt{44100+22500}$

$|Fn|=\sqrt{66600}$

| Fn | = 258 N

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3 years ago

Which statement does not describe a characteristic of a good outline?

lawyer [7]

Answer:

D. is the correct answe.

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3 years ago

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Two insulated copper wires of similar overall diameter have very different interiors. One wire possesses a solid core of copper,

balandron [24]

Answer with Explanation:

We are given that

Radius of solid core wire=r=2.28 mm= $2.28\times 10^{-3} m$

$1mm=10^{-3} m$

Radius of each strand of thin wire=r'=0.456 mm= $0.456\times 10^{-3} m$

Current density of each wire= $J=3750 A/m^2$

a.Area = $\pi r^2$

Where $\pi=3.14$

Using the formula

Cross section area of copper wire has solid core = $3.14\times (2.28\times 10^{-3})^2=16.3\times 10^{-6} m^2$

Current density = $J=\frac{I}{A}$

Using the formula

$3750=\frac{I}{16.3\times 10^{-6}}$

$I=3750\times 16.3\times 10^{-6}=0.061 A$

Total number of strands=19

Area of strand wire= $A'=19\times 3.14\times (0.456\times 10^{-3})^2=12.4\times 10^{-6} m^2$

$J'=\frac{I'}{A'}$

$3750=\frac{I'}{19\times 3.14(0.456\times 10^{-3})^2}$

$I'=3750\times 19\times 3.14(0.456\times 10^{-3})^2$

$I'=0.047 A$

b.Resistivity of copper wire= $\rho=1.69\times 10^{-8}\Omega-m$

Length of each wire =6.25 m

Resistance, R= $\frac{\rho l}{A}$

Using the formula

Resistance of solid core wire= $R=\frac{1.69\times 10^{-8}\times 6.25}{16.3\times 10^{-6}}=6.5\times 10^{-3}\Omega$

Resistance of strand wire= $R'=\frac{1.69\times 10^{-8}\times 6.25}{12.4\times 10^{-6}}=8.5\times 10^{-3}\Omega$

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3 years ago

An airplane accelerates at 16 m/s² from rest. If it lifts off from an aircraft carrier after 6.0 s, how far did it go down the r

Alona [7]

B is the answer
16 x 6.0 = 96
Helping is my pleasure

6 0

3 years ago

Mention any five uses of simple machines.​

Mention any five uses of simple machines.