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Y_Kistochka [10]
3 years ago
9

Can someone help pls

Physics
1 answer:
Illusion [34]3 years ago
8 0
Qs 1: m = 1/2*KE*V^2

qs 2: 6,223.39 kg
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A ball which is dropped from the top of a building strikes the ground with a speed of 30m/s. Assume air resistance can be ignore
Vika [28.1K]

Answer:

               h= 45.87 m.

Explanation:

Data given:

Vf= 30m/s ,     and we know that g = 9.8 m/s²    

The ball has an initial velocity of zero      Vi = 0 m/s²    

To Find:

Height of the building = ?

Solution:

       According to 3rd law of the motion;

                                      2aS= Vf² - Vi²                      ( S= h , a=g)

                                     2*9.81*h = (30)² - (0)²

                                      h= 45.87 m.

3 0
3 years ago
An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. What is the image height? (Indicate the obj
boyakko [2]

The image height is -10 cm (the image is upside down)

Explanation:

We can solve the problem by using the mirror equation:

\frac{1}{f}=\frac{1}{p}+\frac{1}{q}

where:

f = 5 cm is the focal length of the mirror

p = 10 cm is the distance of the object from the mirror

q is the distance of the image from the mirror

Solving for q, we find:

\frac{1}{q}=\frac{1}{f}-\frac{1}{p}=\frac{1}{5}-\frac{1}{10}=\frac{1}{10}\\\rightarrow q= 10 cm

So, the distance of the image from the mirror is 10 cm.

Now we can find the image height by using the magnification equation:

\frac{y'}{y}=-\frac{q}{p}

where

y' is the height of the image

y = 1 cm is the height of the object

and using

p = 10 cm

q = 10 cm

We find the size of the image:

y' = -\frac{qy}{p}=-\frac{(10)(1)}{10}=-10 cm

where the negative sign indicates that the image is upside down.

#LearnwithBrainly

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What is the magnitude of the final velocity of the combined cars?
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It is the same if no external forces are added , that’s your answer.
7 0
3 years ago
Which of the following statements describes an anticyclone?
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B. 
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