Brain

At room temperature, good conductors of heat usually feel cool to the touch. This is because they conduct heat so quickly that w

sp2606 [1]

C. copper

Explanation:

Copper is the best conductor of heat from the given options. Plastic, wood and cotton are all poor conductors other wise known as insulators.

Metals are typically good conductors of heat.

they generally do not have a high specific heat capacity which implies that they get heated easily.
a good conductor allows heat to flow fast and it simultaneously loses heat readily too.
copper is a good conductor, when heat its perfectly allows heat to pass through
when heat is removed, it loses it very fast.

Learn more:

Conductors brainly.com/question/2500879

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4 0

3 years ago

Assume you are a perfect blackbody at a temperature of T = 310 K. What is the rate, in watts, at which you radiate energy? (For

madreJ [45]

Answer:

P = 942.54 W

Explanation:

Given:

Temperature, T = 310 K

mass, m = 70 kg

Now from the stefan's law,

we have the formula

P = σAT⁴

where,

P = radiate energy

σ = Stefan's constant = 5.67 × 10⁻⁸ W/(m² K⁴)

A = Area of the body

Average surface area for a human body = 1.8 m²

T = Temperature

on substituting the values we get,

P = 5.67 × 10⁻⁸ × 1.8 × 310⁴

or

P = 942.54 W

7 0

3 years ago

Need help pls. It is for acellus

Artist 52 [7]

Answer:

The height of the water column = 1.62405 $\overline{30}$ × 10⁻¹ m

Explanation:

The air cavity in the Coke bottle = 0.220 m deep

The fundamental (frequency) it plays when water is added to shorten the column and it is blown across the top, f = 528 Hz

The given speed of sound in air, v = 343 m/s

We note that the air cavity in the coke bottle is equivalent to a tube closed at one end

The fundamental frequency for a tube closed at one end, 'f', is given as follows;

f = v/(4·L) = v/λ

Where;

L = The height of the water column

λ = The wavelength of the wave

∴ 4·L = v/f = (343 m/s)/(528 Hz) = 0.6496 $\overline{21}$ m

∴ L = 0.6496 $\overline{21}$ m/4 = 0.162405 $\overline{30}$ m

The height of the water column = 1.62405 $\overline{30}$ × 10⁻¹ m.

4 0

2 years ago

Read 2 more answers

A projectile is launched from ground level at angle u and speed v0 into a headwind that causes a constant horizontal acceleratio

ale4655 [162]

Answer:

Explanation:

Given

Launch angle =u

Initial Speed is $v_0$

Horizontal acceleration is $a_x=a$

At maximum height velocity is zero therefore

$v_f=v_i-gt$

$0=v_0\sin u-gt$

$t=\frac{v_0\sin u}{g}$

Total time of flight $T=2t=\frac{2v_0\sin u}{g}$

During this time horizontal range is

$R=v_o\cos u\cdot 2t-\frac{a(2t)^2}{2}$

$R=\frac{2v_0^2\sin u\cos u}{g}-\frac{2av_0^2\sin ^u}{g^2}$

For maximum range $\frac{\mathrm{d} R}{\mathrm{d} u}=0$

$\frac{\mathrm{d} R}{\mathrm{d} u}=\frac{2v_0^2\cos 2u}{g}-\frac{4av_0^2\sin u\cos u}{g^2}$

$\frac{\mathrm{d} R}{\mathrm{d} u}=\frac{2v_0^2}{g}\left [ \cos 2u-\frac{a}{g}\sin 2u\right ]=0$

$\tan 2u=\frac{g}{a}$

$u=\frac{1}{2}tan ^{-1}\frac{g}{a}$

(b)If a =10% g

$a=0.1g$

thus $u=\frac{1}{2}tan^{-1}\frac{g}{0.1g}$

$u=42.14^{\circ}$

7 0

2 years ago

What is the primary mechanical advantage of a screw?

9966 [12]

What well u can use to make a shelter but that's all I can think of ??

5 0

3 years ago

Read 2 more answers