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Masteriza [31]
3 years ago
7

What is a frame of reference? how is it used to measure motion? ​

Physics
1 answer:
aleksandrvk [35]3 years ago
8 0

Answer:

When an object changes position with respect to a frame of reference, the object is in motion. Distance measures the path taken.

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What were Rosalind Franklin, James Watson, and Francis Crick’s discovery, and what did it lead to? In three to five sentences, e
Vanyuwa [196]

Rosalind Franklin, James Watson, and Francis Crick’s discovered the DNA's Double Helix.

<h3>What is DNA?</h3>

DNA is an abbreviation for deoxyribonucleic acid and it can be defined as the molecules that are found within cells, and they are saddled with the responsibility of storing genetic information in living organisms.

In 1953, James Watson and Francis Crick's used other scientists' work to create a model of DNA in that they used Rosalind Franklin's photo to help them determine that deoxyribonucleic acid (DNA) was a double helix.

Furthermore, the discovery of DNA's Double Helix by Rosalind Franklin, James Watson, and Francis Crick led to modern molecular biology, which has helped many scientists and researcher to understand how genes control the chemical processes in the body of a living organism.

Read more on DNA's Double Helix here: brainly.com/question/26733817

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8 0
1 year ago
A package is dropped from a helicopter that is moving upward at15m/s. If it takes 8.0 sec before the package strikes the ground,
Rainbow [258]

Answer:

313.6 m

Explanation:

From the question given above, the following data were obtained:

Time (t) = 8 s

Acceleration due to gravity (g) = 9.8 m/s²

Height (h) =?

The height at which the package was dropped can be obtained as follow:

h = ½gt²

h = ½ × 9.8 × 8²

h = 4.9 × 64

h = 313.6 m

Thus, the package was at a height of 313.6 m when it was dropped.

7 0
3 years ago
A force of 5.25 newtons acts on an object of unknown mass at a distance of 6.9 × 108 meters from the center of Earth. To increas
NemiM [27]
The force between two objects is calculated through the equation, 
                        F = Gm₁m₂/d²
where m₁ and m₂ are the masses of the objects. In this case, an unknown mass and Earth. d is the distance between them and G is universal gravitation constant. 

In the second case, if the force is to become 2.5 times the original and all the variables are constant except d then,
                       2.5F = Gm₁m₂ / (D²)
                                D = 0.623d

Subsituting the known value of d,
                                D = 0.623(6.9 x 10^8) = <em>4.298 x 10^8 m</em>
                           
5 0
3 years ago
Read 2 more answers
Which of these helps you understand what people are saying to you? A. Interrupting them B. Looking away while they're speaking C
densk [106]
I believe the answer is <span> D. Thinking about what they're saying
Interrupting them will make them unable to finish their full message/thought to you. Looking away while they're speaking will make you reduce your attention and unable to process the information properly. Thinking about how you'll response also limit your attention to them and could make you cloud your opinion and misinterpret what's they're saying.</span>
3 0
3 years ago
Read 2 more answers
A proton moves with a speed of 4.00 106 m/s horizontally, at a right angle to a magnetic field. What magnetic field strength is
Free_Kalibri [48]

Answer:

Magnetic field, B=2.55\times 10^{-14}\ T

Explanation:

It is given that,

Speed of proton, v=4\times 10^6\ m/s

Mass of the proton, m=1.67\times 10^{-27}\ kg

Charge on proton, q=1.6\times 10^{-19}\ C

We need to find the magnetic field strength required to just balance the weight of the proton and keep it moving horizontally.

The Lorentz force is given by :

F=q(v\times B)=qvB\ sin90.............(1)

The weight of proton,

W=mg..............(2)

From equation (1) and (2), we get :

mg=qvB

B=\dfrac{mg}{qv}

B=\dfrac{1.67\times 10^{-27}\ kg\times 9.8\ m/s^2}{1.6\times 10^{-19}\ C\times 4\times 10^6\ m/s}

B=2.55\times 10^{-14}\ T

Hence, this is the required solution.

3 0
3 years ago
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