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Ede4ka [16]
3 years ago
7

Decide if each description below is an example of a change caused by energy. From the drop-down menu, choose "IS" if it is an ex

ample of a change in energy and "IS NOT" if it is not an example of a change in energy. A fireworks show an example of a change in energy. A child growing an example of a change in energy. A ball on the ground an example of a change in energy. A plant making food from the Sun an example of a change in energy. A car starting an example of a change in energy. A bat hitting a ball an example of a change in energy. An oven heating up an example of a change in energy.
Physics
1 answer:
barxatty [35]3 years ago
4 0

Answer:

z

Explanation:

z

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When milk goes sour, what type of change has happened?
zzz [600]
B) Chemical change only
7 0
4 years ago
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By what factor does the peak frequency change if the celsius temperature of an object is doubled from 20.0 ∘c to 40.0 ∘c?
mart [117]

Answer:

it increases by a factor 1.07

Explanation:

The peak wavelength of an object is given by Wien's displacement law:

\lambda=\frac{b}{T} (1)

where

b is the Wien's displacement constant

T is the temperature (in Kelvins) of the object

given the relationship between frequency and wavelength of an electromagnetic wave:

f=\frac{c}{\lambda}

where c is the speed of light, we can rewrite (1) as

\frac{c}{f}=\frac{b}{T}\\f=\frac{Tc}{b}

So the peak frequency is directly proportional to the temperature in Kelvin.

In this problem, the temperature of the object changes from

T_1 = 20.0^{\circ}+273=293 K

to

T_2 = 40.0^{\circ}+273 = 313 K

so the peak frequency changes by a factor

\frac{f_2}{f_1} \propto \frac{T_2}{T_1}=\frac{313 K}{293 K}=1.07

8 0
4 years ago
A 48.0-kg astronaut is in space, far from any objects that would exert a significant gravitational force on him. He would like t
marusya05 [52]

Answer:

The astronaut is moving at a speed of 0.36m/s

Explanation:

Speed here corresponds to velocity

The astronaut's mass = 48kg

velocity of astronaut = ?

mass of socket = 0.72kg

velocity of socket = 5m/s

mass of the spanner = 0.8kg

velocity of spanner = 8m/s

change in time = 0.05 -0 = 0.05sec

mass of the mallet = 1.2kg

velocity of mallet = 6m/s

change in time = 9.9 -0 = 9.9sec

To find the astronaut velocity, we would calculate the total momentum which is the astronaut.

∑momentum (M) = ∑astronaut momentum

∑M = ∑astronaut M

∑astronaut M = M of socket + M of spanner + M of mallet

momentum = mass × velocity

(mass × velocity)of astronaut = (0.72×5) + (0.8×8) + (1.2×6)

48 × velocity of astronaut= 3.6 + 6.4 + 7.2

48 × velocity of astronaut= 17.2

velocity of astronaut = 17.2/48

velocity of astronaut = 0.36m/s

The astronaut is moving at a speed of 0.36m/s

5 0
3 years ago
What is the direction of magnetic field lines inside any magnet?
Kruka [31]

the answer is a because they start on the north side

3 0
4 years ago
Read 2 more answers
g In a cold rolling operation, steel sheets that are initially 300 cm long X 80 cm wide X 8 cm thick are cold worked to 80 cm wi
seropon [69]

Answer:

100% cold working performed on this steel

Explanation:

Using the constant volume assumption:

                L₀W₀t₀ (initial)                                    =                      Lₐ Wₐ tₐ (final)

thus 300 cm long X 80 cm wide X 8 cm thick =   Lₐ x 80 cm wide X 5 cm thick

Lₐ = 300 cm long X 80 cm wide X 8 cm thick/80 cm wide X 5 cm thick

  =480 cm

% cold working performed on this steel = Lₐ Wₐ tₐ (final) /  L₀W₀t₀ (initial) 8 100

= 480 x 80 x 5/ 300 x 80 x 8 *100 = 100%

6 0
3 years ago
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