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Artist 52 [7]
3 years ago
15

In which of the following elevator situations would the acceleration be positive. Select TWO answers

Physics
1 answer:
kap26 [50]3 years ago
4 0

Both options 5 and 6

Explanation:

Let us consider option 5,

In option 5 body is moving up with initial velocity lower than that of final velocity which gets accelerated. Therefore the acceleration is positive in this case.

Let us consider option 6,

In option 6 body is moving down with initial velocity lower than that of final velocity which gets accelerated. Therefore the acceleration is positive in this case.

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A viola string with a fundamental frequency of D4 (293 Hz) is generally tuned using a tension of 49.0 N. However, just before a
Alborosie

Answer:

Explanation:

For fundamental frequency in a vibrating string , the formula is

n = 1 / 2L  x  √ ( T /m₁ )

n is frequency , L is length , T is tension and m₁ is mass per unit length .

For first string ,

293 =  1 / 2L  x  √ ( 49 N  /m₁ )

For second string , let mass per unit length be m₂ .

196 =  1 / 2L  x  √ ( 49 N  /m₂ ) ------ ( 1 )

To bring its frequency back to previous one let tension be T

293  =  1 / 2L  x  √ ( T  /m₂ ) ------- ( 2 )

Dividing

293 / 196 = √ ( T  /49  )

1.4948 = √ ( T  /49  )

2.2344 = T  /49

T = 109.48 N .

8 0
2 years ago
How do you think this Eskimo nebula could affect Earth and
soldi70 [24.7K]

Answer:

It does not affect. The closest nebula is the Orion Nebula at more than 1300 light years from Earth. It is so remote that nothing that happens there can influence the Earth. The only influence is to have beautiful colors and shapes and to let us dream one day to go there and explore them.

Explanation:

5 0
2 years ago
The fraction of the total radiation that is reflected by any surface is called its _____.
Vadim26 [7]

Answer: D. Albedo

Explanation:

The proportion of total light incident on surface that is reflected back is called its albedo. These are typical features of an astronomical body. It is a dimension less quantity and its value ranges from 0 to 1. Light surfaces reflect larger amount of light than dark surfaces. This feature can be clearly seen on planet Mars and the Moon.

Thus, the fraction of the total radiation that is reflected by any surface is called its <u>Albedo.</u>

8 0
3 years ago
Read 2 more answers
NEED HELP ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
kati45 [8]
A catalyst is a substance that alters the reaction and doesn't involve in the reaction.So if the Manganese was a catalyst the mass would not have decreased,it would just continue aletring the reaction until its used up.
The Manganese is not acting as a catalyst
6 0
3 years ago
You want to estimate the diameter of a very small circular pinhole that you’ve made in a piece of aluminum foil. To do so, you s
mrs_skeptik [129]

Answer:C

Explanation:

Given

Wavelength of light \lambda =632\ nm

Screen is placed at a distance of D=3.5\ m

width of central maximum w=15\ mm

We know that width of central maximum is given by

w=\frac{2.44\lambda D}{d}

where d=diameter of hole

d=\frac{2.44\lambda D}{w}

d=\frac{2.44\times 632\times 10^{-9}\times 3.5}{15\times 10^{-3}}

d=0.359\ mm

d=0.36\ mm

4 0
3 years ago
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