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sleet_krkn [62]
3 years ago
10

How long will it take for an object to hit the ground when dropped from a height of 7m?

Physics
1 answer:
White raven [17]3 years ago
3 0

Answer:

Multiply the time by the acceleration due to gravity to find the velocity when the object hits the ground. If it takes 9.9 seconds for the object to hit the ground, its velocity is (1.01 s)*(9.8 m/s^2), or 9.9 m/s.

Explanation:

mark me as the brainliest please

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Differences between sublimation and condensation
zaharov [31]

The difference between sublimation and condensation is that

Sublimation is used to in a separation technique to separate sublime substance from a mixture while condensation is the

is the process where water vapor becomes liquid

<h3>What is separation technique?</h3>

This technique is used in chemistry to separate two or more constituents from a mixture

In conclusion, sublimation differs from condensation because sublimation is used to in a separation technique to separate sublime substance from a mixture while condensation is the

is the process where water vapor becomes liquid

Learn more about separation technique:

brainly.com/question/10862519

#SPJ1

5 0
2 years ago
A dart is loaded into a spring-loaded toy dart gun by pushing the spring in by a 
distance d. For the next loading?the spring is
Mrac [35]

Answer:

W'=\dfrac{W}{9}

Explanation:

The potential energy of the spring or the work done by the spring is given by :

W=\dfrac{1}{2}kd^2............(1)

k is the spring constant

d is the compression

When the spring is compressed a distance d' = d/3, let W' is the work is required to load the second dart. Then the work done is given by :

W'=\dfrac{1}{2}kd'^2

W'=\dfrac{1}{2}k(d/3)^2.............(2)

Dividing equation (1) and (2) :

\dfrac{W}{W'}=\dfrac{1/2kd^2}{1/2k(d/3)^2}

\dfrac{W}{W'}=9

W'=\dfrac{W}{9}

So, the work required  to load the second dart compared to that required to load the first is one-Ninth as much. Therefore, the correct option is (E).

7 0
3 years ago
A 2.00 kg steel gas can holds 25.0 L of gasoline when full. What is the average density (in kg/m3) of the full gas can, taking i
ddd [48]

Answer:80kg/m^3

Explanation:

1L = 0.001m^3

25L= 25 *0.001 = 0.025m^3

Average density =mass/volume

Average density =2/0.025=80kg/m^3

4 0
3 years ago
Read 2 more answers
To navigate, a porpoise emits a sound wave that has a wavelength of 3.3 cm. The speed at which the wave travels in seawater is 1
dedylja [7]

Answer:

2.2\times 10^{-5} s

Explanation:

We are given that  

The wavelength of sound wave=\lambda=3.3 cm=3.3\times 10^{-2}m/s

1 cm/s=10^{-2}m/s

Speed of sound wave,v=1522 m/s

We have to find the period of the wave.

We know that

Frequency=\nu=\frac{v}{\lambda}

Using the formula

Frequency =\frac{1522}{3.3\times 10^{-2}}=4.6\times 10^{4} Hz

Time period=\frac{1}{4.6\times 10^4}=0.22\times 10^{-4}\times \frac{10}{10^1}=2.2\times 10^{-4-1}=2.2\times 10^{-5}s

Using identity:\frac{a^x}{a^y}=a^{x-y}

Hence, the time period of the wave=2.2\times 10^{-5} s

4 0
3 years ago
A computational model predicts the speed of a roller coaster car at different heights given its speed at the lowest height of it
s2008m [1.1K]

Answer:

the answers, the correct one is A   v= 22.5 m/s

Explanation:

We can solve this problem using the concepts of conservation of mechanical energy

Starting point. Lowest point of the trajectory

       Em₀ = K = ½ m v₀²

Final point. When it is at a height of y = 20 m

       Em_{f} = K + U = ½ m v² + mg y

     

how energy is conserved

         Emo = Emf

         ½ m v₀² = ½ m v² + m g y

         v² = v₀² + 2 g y

 

let's calculate

         v²2 = 30 2 + 2 9.8 20

         v² = 508

         v²= ra 508

         v² = 22.54 m / s

When checking the answers, the correct one is A

4 0
3 years ago
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