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Wewaii [24]
3 years ago
8

An explosion occurs 34 km away. The time it takes for its sound to reach your ears, traveling at 343 m/s, is

Physics
2 answers:
madam [21]3 years ago
7 0

Answer: 99.1 seconds

Explanation: You know that the total distance is 34km, and the speed of the sound is 343m/s.

Now, the total time that takes to something with a given velocity, to reach a distance D, is:

T = D/v

where D = 34km and v = 343m/s

Now, here we have different units, so we must convert the kilomeres into meters, this can be done as: 1km = 1000m then, 34km = 1000*34m = 34000m

Then the total time is:

T = 34000m/343m/s = 99.1 seconds

Ostrovityanka [42]3 years ago
6 0

Answer:

99 s

Explanation:

distance = rate × time

34000 m = (343 m/s) t

t = 99 s

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timurjin [86]

Answer:

It’s the atomic clock

Explanation:

3 0
3 years ago
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180 cm3 of hot tea at 97 °C are poured into a very thin paper cup with 20 g of crushed ice at 0 °C. Calculate the final temperat
Zolol [24]

Answer : The final temperature of the mixture is 91.9^oC

Explanation :

First we have to calculate the mass of water.

Mass = Density × Volume

Density of water = 1.00 g/mL

Mass = 1.00 g/mL × 180 cm³ = 180 g

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

q_1=-q_2

m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)

where,

c_1 = specific heat of hot water (liquid) = 4.18J/g^oC

c_2 = specific heat of ice (solid)= 2.10J/g^oC

m_1 = mass of hot water = 180 g

m_2 = mass of ice = 20 g

T_f = final temperature of mixture = ?

T_1 = initial temperature of hot water = 97^oC

T_2 = initial temperature of ice = 0^oC

Now put all the given values in the above formula, we get

(180g)\times (4.18J/g^oC)\times (T_f-97)^oC=-(20g)\times 2.10J/g^oC\times (T_f-0)^oC

T_f=91.9^oC

Therefore, the final temperature of the mixture is 91.9^oC

8 0
3 years ago
The secret recipe to the ever-popular veggie burgers in the college cafeteria is hidden in a drawer in the director’s office. Tw
djverab [1.8K]

Answer:

Waxing crescent to Waxing gibbous

Explanation:

As the Moon goes around Earth and Earth goes around the Sun, the Moon shows us different phases throughout this journey. Also because of peculiar revolution period around the Earth the rise and set time of Moon changes daily. New Moon rises with the Sun rise and sets with Sun set. Waxing half rises in the mid of the day and sets at midnight. Full Moon rises after sunset and sets at sunrise.

The suitable phases will be from waxing crescent to waxing gibbous. The phase of the Moon, 3 days before the full Moon can be selected as the Moon will set by around 2.5 hours before the Sun rise.

4 0
3 years ago
Which force most likely created this mountain?<br>compression<br>gravity<br>sheaning<br>tension​
Zielflug [23.3K]

Answer:

compression

Explanation:

compression can produce faulting in rocks in the form of thrust faults and can also cause liner valleys (grabens) and mountains

5 0
3 years ago
Your 300 mL cup of coffee is too hot to drink when served at 87.0 degrees Celsius. What is the mass of the ice cube, taken from
mojhsa [17]

Answer:

m=43.39 Kg

Explanation:

from conservation principle we have

heat gained by  ice equal to heat lost by coffee

heat gained by ice = heat from -15 °C ice to 0 °C ice + 0 °C ice to 0 °C water + 0 °C water to 65 °C water

                                 = m*S1*15 + mL + ms2 *65

where s is specific heat of respective phase

                               = m(2.08 *15 + 334.16 + 4.184 *65)

                                = m*637.32

heat lost by the coffee= ms* delta T

                                     =0.3 *4190 *(87-65)

                                     =27654

therefore

27654   = m*637.32

m=43.39 Kg

3 0
3 years ago
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