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3 years ago

7

An object has an emissivity of 0.725. At temperature T, it radicates heat at a rate of 10 W. What is its rate of heat radiation

at temperature 2 T

1 answer:

katrin [286]3 years ago

3 0

Radiative power scales with the fourth power of temperature, so 160 W.

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Two different wave groups with the same height travel together in the same direction. The wavelength of one group is twice as lo

Morgarella [4.7K]

Answer:

A combined wave of extra height will produce every other wave.

Explanation:

One wave Crest can catch up to another wave Crest if the group of waves are from different places.

Here the two group of waves have different wavelength but travelling together in the same direction so when they combine,they will produce every other wave.

8 0

4 years ago

If the mass of a material is 115 grams and the volume of the material is 16 cm3, what would the density of the material be?

hjlf

Well, density is mass/volume. So what's 115 g / 16 cm3? That'll get you your density. Remember that density will be in g/cm3!

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3 years ago

If a cable insulation is described as RHW, you would be able to use the cable for what maximum temperature?

BartSMP [9]

167•F which is c

Tell me my wrong from right

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3 years ago

How long must a simple pendulum be if it is to make exactly one swing per second? (That is, one complete vibration takes exactly

umka2103 [35]

Oscillation is a type of periodic motion which repeats itself to and from about a point which is called mean position. The period of a Pendulum can be described as a ratio between the length and gravity as,

$T = 2\pi \sqrt{\frac{L}{g}}$

Here,

L = length

g = Gravity

If we rearrange to find the length we have that,

$L = \frac{T^2g}{4\pi^2}$

Our period is 2s and the gravity is 9.8m/s^2, then,

$L = \frac{(2)^2(9.8)}{4\pi^2}$

$L = 0.9929m$

The simple required length of the pendulum must be 0.9929m

8 0

4 years ago

A student pushes a box with a total mass of 50 kg. What is the net force on the box if it accelerates at 1.5m/s2? A. 51.5 N B. 4

const2013 [10]

Use the Second Law of Newton, which states that Net Force = mass times acceleration

F = m * a

F = 50 kg * 1.5 m/s^2 = 75 N

Answer: option C

3 0

3 years ago