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Rufina [12.5K]
2 years ago
12

Which of the following is not an example of a physical change?

Physics
1 answer:
Mazyrski [523]2 years ago
8 0

Answer:

Explanation:

Cutting a string in half because

b is irreversible

c is a cheical and d is also a chemical change

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Take 50 points please help me look the picture ​
SCORPION-xisa [38]

Answer:

4 : 1

Explanation:

<h3><u>Pulse rate</u></h3>

Also referred as heart rate can be affected due to vigorous exercise, age, health. Normally the pulse rate of an adult is between 60 to 100 beats per minute. pulse rate: 80 bpm.

<h3><u>Breathing rate</u></h3>

The amount of oxygen taken in inside of our body from the air. Breathing rate is usually affected due to age. Normal breathing rate of an adult is between 15 to 24 breaths per minute. breathing rate: 20 bpm.

<h3><u>Ratio of breathing to pulse rate</u></h3>

pulse rate : breathing rate

            80 : 20

              4 : 1

3 0
2 years ago
1. If I travel 50 miles in 5minutes, how fast am I going?
Anarel [89]

Answer:

10 miles a min

Explanation:

math

3 0
3 years ago
What is your hypothesis (or hypotheses) for this experiment?<br> This lab is about density
Zolol [24]
The _____ with less density will sink and the higher density ____ will rise
6 0
3 years ago
Read 2 more answers
In a grandfather clock, the second hand moves forward by one second for each half period of the clock’s pendulum.
Maurinko [17]

To solve the problem it is necessary to take into account the concepts related to simple pendulum, i.e., a point mass that is suspended from a weightless string. Such a pendulum moves in a harmonic motion -the oscillations repeat regularly, and kineticenergy is transformed into potntial energy and vice versa.

In the given problem half of the period is equivalent to 1 second so the pendulum period is,

T= 2s

From the equations describing the period of a simple pendulum you have to

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

Where

g= gravity

L = Length

T = Period

Re-arrange to find L we have

L = \frac{gT^2}{4\pi^2}

Replacing the values,

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

L = 0.99m

In the case of the reduction of gravity because the pendulum is in another celestial body, as the moon for example would happen that,

T = 2\pi \sqrt{\frac{L}{g/6}}

T = 2\pi\sqrt{\frac{6L}{g}}

T = 2\pi \sqrt{\frac{6*0.99}{9.8}}

T  = 4.89s

In this way preserving the same length of the rope but decreasing the gravity the Period would increase considerably.

6 0
3 years ago
A truck accelerates from a stop to 27m/sec in 9 minutes. What was the trucks acceleration?
stepan [7]
Vi = 0 m/s
Vf = 27 m/s
t = 9 min = 540 s
1 min = 60 s
9 min = 540 s
a = ? m/s^2.

vf = vi + at
27 = 0 + 540a
27 = 540a
27/540 = 540a/540
27/540 = a
0.05 = a.

The truck's acceleration was 0.05 m/s^2.
6 0
3 years ago
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