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3 years ago

What are the tow major topics studied by a physicist?

Physics

2 answers:

Valentin [98]3 years ago

6 0

Matter and energy are the two major topics studied by a physicist.

Answer: Option D

<u>Explanation:</u>

The universe is composed of different types of matter because of which evolution occurs. Due to interaction between matter, energy is released or absorbed as a result. Physics deals with the study of matter and energy and so it is the main area of concentration for the physicists.

Biology and ecology are related to biologists and environmentalists. Evolution is related to the paleontologists where matter forms the basis for the evolution of human kind.

Nutka1998 [239]3 years ago

5 0

D- Matter and Energy

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Juli2301 [7.4K]

All o the galaxies are moving in a same speed

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3 years ago

By means of a rope whose mass is negligible, two blocks are suspended over a pulley, as the drawing shows, with m1 = 12.1 kg and

puteri [66]

Answer:

14.8 kg

Explanation:

We are given that

$m_1=43.7 kg$

$m_2=12.1 kg$

$g=9.8 m/s^2$

$a=\frac{1}{2}(9.8)=4.9 m/s^2$

We have to find the mass of the pulley.

According to question

$T_2-m_2 g=m_2 a$

$T_2=m_2a+m_2g=m_2(a+g)=12.1(9.8+4.9)=177.87 N$

$T_1=m_1(g-a)=43.7(9.8-4.9)=214.13 N$

Moment of inertia of pulley= $I=\frac{1}{2}Mr^2$

$(T_2-T_1)r=I(-\alpha)=\frac{1}{2}Mr^2(\frac{-a}{r})=\frac{1}{2}Mr(-4.9)$

Where $\alpha=\frac{a}{r}$

$(177.87-214.13)=-\frac{1}{2}(4.9)M$

$-36.26=-\frac{1}{2}(4.9)M$

$M=\frac{36.26\times 2}{4.9}=14.8 kg$

Hence, the mass of the pulley=14.8 kg

6 0

3 years ago

The picture shows a jar of grape jelly. If you were to shine a bright light through the jar, what would happen to most of the li

inessss [21]

It would be reflected because the jelly isn't all the way transparent

8 0

4 years ago

Read 2 more answers

Classify the following situations into contact and non-contact forces.

NARA [144]

Answer: Contact force

a. Applying break in a vehicle.

d. The speed of ball rolling on ground is reduced

Non contact force

b. A coconut falling from a coconut tree.

c. The planets revolving around the sun.

Explanation:

The contact force is the force which exerts when one object or entity comes in contact with other object or entity. For example, on application of break the vehicle stops, the force is applied on the breaks to stop the vehicle. The ball rolling on the ground the speed reduces so the application of force on the ground also reduces.

The non contact force is the force one object exerts on the other without coming in direct contact with the other object. The force exerted by one object on other due to gravity is a non contact force. The coconut falling on the ground and planets revolving around the sun are examples of non contact force due to gravity.

8 0

3 years ago

The frequency of the harmonics following a fairly simple pattern, as described in the text. If the frequency of the fundamental

zalisa [80]

Answer:

f2 = 140 Hz

Explanation:

let fundamental frequency is f1 = 70.0 Hz

formula for finding the higher frequency when fundamental frequency is known

fn = n f1 (where f1 is fundamental frequency and n = 1,2,3,4,5...........)

for the second frequency n=2

f2 = 2 × 70.0 Hz

f2 = 140 Hz

6 0

4 years ago