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4 years ago

Light striking a mirror at a 50° angle will be reflected at an angle _____.

Physics

2 answers:

jasenka [17]4 years ago

7 0

Answer:Actually the answer would be correctly less than 50

Explanation:Because Light is always reflected at an angle equal and opposite to the incoming wave. For example, light striking a mirror at a 45° angle will be reflected in the opposite direction at a 45° angle.

Stells [14]4 years ago

5 0

Equal to 50

law of reflection: angle of incidence equals angle of reflection

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Please help, will mark brainliest

Fiesta28 [93]

Answer:

A.55.49W, B. 25g

Explanation:

The heat required to free the water at 17°c is that required to reduce it to water at 0°c plus that to convert it to ice at 0°c plus that required to get it to ice at -12°c.

Note that in the conversion process mass is constant.

Hence the heat extracted is defined as mass ×specific heat capacity × temperature change.

But on conversion from water to ice at 0°c the heat extracted is mass × latent heat of fusion.

Putting all together we have :

26 ×4.186 ×(0-19) -26 ×334 + 26 × 2.090× (-12-0)

=2067.884+8684+652.08=9988.16J

This is the output power

From performance formula;

Coefficient of performance=output power /input power

Input power = output power / coefficient of performance

Input power=9988.16J/3 =3329.39j

In watt we divide by 60

3329.39/60= 55.49W

Note the negative sign is just an indication that heat is been lost from the system.

B. Let's calculate Energy per unit mass of the process

9988.16J/26 =384.16J/g

Power consumption is 160w

This is the input power of the system

160 W is available to make ice.

This means 160 ×60 J is the energy available to make ice since the whole process takes 60s.

That energy =9600J

But the output energy per unit mass is 384.16J/g.

Hence the required mass for 9600J is

9600/384.16= 24.99g

Approximately 25g

4 0

3 years ago

Statement A: Area of a rectangle with measured length = 2.536 m and width = 1.4 m.

Effectus [21]

Answer:

Statement A is greater than Statement B

Explanation:

Statement A

The area A of a rectangle is a product of length and with hence

$A = l \times b$

Taking l as 2.536 and b as 1.4 then

$\begin{array}{c}\\A = 2.536\,{\mathop{\rm m}\nolimits} \times 1.4\,{\mathop{\rm m}\nolimits} \\\\ = 3.5504\,{\mathop{\rm m}\nolimits} \\\end{array}$

Since 1.4 is the least significant number in the product, with 1 decimal place, so we express our area also to 1 decimal place hence we obtain 3.6

Statement B

The area A of a rectangle is also a product of length and width hence

$A = l \times b$

Substitute 2.536 for l and 1.41 for b

$\begin{array}{c}\\A = 2.536\,{\mathop{\rm m}\nolimits} \times 1.41\,{\mathop{\rm m}\nolimits} \\\\ = 3.57576\,{\mathop{\rm m}\nolimits} \\\end{array}$

Here, the least significant figure within the product is 1.41 with 3 significant numbers or 2 decimal places so the answer also must be expressed to 3 significant figures which is 3.58

Now comparing 3.6 to 3.58, it's clear that 3.6 is greater than 3.58 so statement A is greater than statement B

Hence, Statement A is greater than Statement B

7 0

4 years ago

Set kinetic energy equal to potential energy and solve for velocity

nikdorinn [45]

KE = PE
1/2 m • v^2 = mgh
1/2 • v^2 = gh
V^2/2 = gh
2 • (v^2/2) = 2 • (gh)
V^2 = 2gh
V = sq root (2gh).

8 0

4 years ago

A potato cooks in a microwave oven. Microwaves are invisible waves that contain energy. How is heat being added to the potato?

marshall27 [118]

the engery from the microwave is asorbed by the potato

7 0

3 years ago

Adding energy (_____) causes the temperature to _____ OR the phase to change. Removing energy (flows______) causes the temperatu

serg [7]

Answer:

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5 0

3 years ago