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Yuliya22 [10]
3 years ago
5

Pleaseeee helppp!!!!!!!!!!

Physics
1 answer:
Basile [38]3 years ago
5 0
Answer unbalance

Step by step explanation
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D) upright , same size as object ,virtual

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A sound wave has a frequency of 300 Hz. If the wavelength is .50 m, then what is the speed of
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15000 m/s

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Marie observed people at a store. Which is a qualifier observation she may have made ?
leva [86]

Complete question is;

Marie observed people at a store. Which is a qualitative observation she may have made?

A. Twenty people walked into the store.

B. The store sells clothes.

C. It was 1:00 P.M.

D. all of the above

Answer:

Option B:The store sells clothes.

Explanation:

We want to find the one that is a qualitative observation;

Looking at the options;

A. Twenty people walked into the store. This denotes a quantitative measure because of the number 20.

B. The store sells clothes. This denotes a qualitative measure because it describes what she sells.

C. This is a quantitative measure because it deals with time of 1 pm which is quantitative.

Therefore, the correct answer is Option B

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3 years ago
A Ferris wheel has radius 5.0 m and makes one revolution every 8.0 s with uniform rotation. A person who normally weighs 670 N i
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Answer:

The apparent weight of the person as she pass the highest point is  N  =  458.8 \ N

Explanation:

From the question we are told that

   The radius of the Ferris wheel is r = 5.0 \ m

    The period of revolution is T = 8.0 \ s

     The weight of the person is  W  =  670 \ N

   

Generally the speed of the wheel is mathematically represented as

      v =  \frac{2 \pi r}{T }

substituting values

      v =  \frac{2 * 3.142 *  5}{8 }

       v =  3.9 3 \ m/s

The apparent weight (the normal force exerted on her by the bench) at the highest point is mathematically evaluated as

          N  =  mg  - \frac{mv^2}{r}

Where m is the mass of the person which is mathematically evaluated as

     m =  \frac{W}{g}

substituting values

    m =  \frac{670}{9.8}

    m =  68.37 \ kg

So

    N  =  68.37 * 9.8   - \frac{68.37 * {3.93}^2}{5}

    N  =  458.8 \ N

5 0
3 years ago
Which of the following is not a way to make exercising on a cold day safer?
IRISSAK [1]

Answer:

D.

Explanation:

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