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Kaylis [27]
3 years ago
7

A small black spot is present on the metal plate and if the metal plate is heated to red hot and quickly placed in a dark room t

hen the spot will appear white while the plate appears black. The spot is white because its a perfect black body and is heated, but why does the plate appear black? Why not red?
Physics
1 answer:
guapka [62]3 years ago
8 0

this has something to do with black body radiation and absorption

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At an accident scene on a level road, investigators measure a car’s skid mark to be 88 m long. The accident occurred on a rainy
Oduvanchick [21]

Answer:

The the speed of the car is 26.91 m/s.

Explanation:

Given that,

distance d = 88 m

Kinetic friction = 0.42

We need to calculate the the speed of the car

Using  the work-energy principle

work done = change in kinetic energy

W=\Delta K.E

\mu\ mg\times d=\dfrac{1}{2}mv^2

v^2=2\mu g d

Put the value into the formula

v=\sqrt{2\times0.42\times9.8\times88}

v=26.91\ m/s

Hence, The the speed of the car is 26.91 m/s.

3 0
2 years ago
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A 15-kg block at rest on a horizontal frictionless surface is attached to a very light ideal spring of force constant 450 N/m. T
den301095 [7]

Answer:

0.266 m

Explanation:

Assuming the lump of patty is 3 Kg then applying the principal of conservation of linear momentum,

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Substituting the given values then

3*8=v(15+3)

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(3+15)*1.33^{2}=450*x^{2}\\x\approx 0.266 m

7 0
3 years ago
The peak value of an alternating current in a 1500-W device is 6.4 A. What is the rms voltage across it
horrorfan [7]

Answer:

6787.5 V

Explanation:

From the question,

P = IV..................... Equation 1

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make V the subject of the equation

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Given: P = 1500 W, I = 6.4/√2 = 4.525 A

Substitute these values into equation 2

V = 1500(4.525)

V = 6787.5 V

Hence the rms voltage = 6787.5 V

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3 years ago
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saveliy_v [14]

Answer:

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4 0
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Define the relationship between force acceleration and mass
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