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4 years ago

5

______ is most resistant to thermal energy transfers. a. copper wire b. aluminum foil c. water d. foam insulation

1 answer:

Reika [66]4 years ago

8 0

Answer:

Water

Explanation:

Because it does not conduct much energy.

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The error in a compass is called

Olegator [25]

Answer: "Deviation"

Explanation:

Magnetic fields of aircraft may sometimes mess with the wiring structure which can cause the compass to have a deviation or error!

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3 years ago

Which does not provide an example of mechanical energy?

Lina20 [59]

B.Sunlight because and what do you not understand. I'll help you with it

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3 years ago

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Oops didn’t mean to ask a question

skad [1K]

Answer:

free pionts thanks

Explanation:

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3 years ago

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A brush fire is burning on a rock ledge on one side of a ravine that is 25 m wide. A fire truck sits on the opposite side of the

Ierofanga [76]

Answer:

$v_o = 30.5 m/s$

Explanation:

Height of the hose pipe is given as

$y = 4.5 m$

horizontal distance is given as

$x = 25 m$

angle of elevation is given as 35 degree with the horizontal

now we know that the horizontal distance moved is given as

$x = (v_ocos35) t$

$y = 4.5 + (v_o sin35) t - \frac{1}{2}(9.8)t^2$

now we have

$25 = v_o(0.82)t$

also we have

$0 = 4.5 + 0.57 v_o t - 4.9 t^2$

$0 = 4.5 + (0.57)(0.82) - 4.9 t^2$

$t = 1.00 s$

so we have

$v_o = 30.5 m/s$

8 0

3 years ago

You have a grindstone (a disk) that is 90.0 kg, has a 0.340-m radius, and is turning at 90.0 rpm, and you press a steel axe agai

QveST [7]

Answer:

Explanation:

Given mass of grindstone $m=90\ kg$

radius of stone $r=0.34\ m$

angular speed of disc $\omega =90\ rpm$

Steel Axle applying a force of $F=20\ N$

coefficient of kinetic friction $\mu =0.2$

Frictional Torque applied by steel is given by

$\tau=r\times f_r$

$\tau =r\times \mu F$

where $f_r$ =frictional force

$\tau =r\times \mu \times F$

$\tau =0.34\times 0.2\times 20$

$\tau =1.36\ N-m$

Torque is also given by

$\tau =I\cdot \alpha$

where $\alpha$ =angular acceleration

I=moment of Inertia

$\tau =0.5Mr^2\times \alpha$

$0.5Mr^2\times \alpha =1.36\ N-m$

$0.5\times 90\times 0.34^2\times \alpha =1.36$

$\alpha =0.261\ rad/s^2$

3 0

4 years ago