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Zina [86]
3 years ago
7

Need help with my science quiz

Physics
1 answer:
MaRussiya [10]3 years ago
5 0

Explanation:

1.sugar

................

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Which of the following types of stars had the smallest initial mass? Blue main sequence Neutron star Red supergiant White dwarf
Nezavi [6.7K]

Answer:

White dwarf

Explanation:

The Hertzsprung-Russell Diagram shows the mass of stars, the color, temperature and their  brightness.Stars that lie below the main sequence area such as the White dwarf have the smallest initial mass.A white dwarf star has a mass less than that of the Sun.

6 0
3 years ago
Sketch a free body diagram for a hot air balloon which is rising off the ground. Indicate the magnitude of the force by utilizin
vaieri [72.5K]

Answer:

   F_net = B -W

The forces of action and reaction are the weight of the balloon that is the force of attraction of the Earth and the outside so the balloon pulls the earth that has an upward direction and is applied to the planet

Explanation:

A hot air balloon is subjected to the force of its weight directed towards the center of the Earth. The thrust due to the cold air released, this thrust is directed upwards.

If we assume that the balloon rises at a constant speed

         F_net = B -W

         F_neta = ρ g V_body - ρ_body g V_body

The forces of action and reaction are the weight of the balloon that is the force of attraction of the Earth and the outside so the balloon pulls the earth that has an upward direction and is applied to the planet

3 0
3 years ago
Suppose you balance a 2-kg ball on the tip of your finger, which has an area of 1 cm2. Show that the pressure on your finger is
Nezavi [6.7K]
For the answer to the question above, we have to use this formula
Pressure = P = force / area 
Then, just substitute the values of the formula
force = mg = 2(10) = 20 N 

area = A = 1 cm² = [1 x 10 ̄ ²]² m² 


=> P = 20 N / [1 x 10 ̄ ²]² = 200 x 10³ Pa 

= 200 kPa 
I hope my answer helped you. Have a nice day!
5 0
3 years ago
How far can a bullet at 450 m/s travel for 4.7 s?
marta [7]

  • The bullet can travel about distance of (2115 m)

  • Velocity can be regarded as the ratio of distance to time

  • Velocity= (distance / time)

Given: velocity= 450 m/s

Time= 4.7s

  • Distance= ( velocity × time)

<em>If we substitute the values</em>

  • Distance = ( 450 × 4.7)

= 2115 m

Therefore, the bullet can travel about 2115 m

Learn more at : brainly.com/question/13639113?referrer=searchResults

5 0
3 years ago
What are some examples of constructive interference and the Doppler Effect in real life​
trapecia [35]

Answer there really are not any examples to use

Explanation:

8 0
3 years ago
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