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____ [38]
3 years ago
11

The hottest climates on Earth are located near the Equator because this region

Physics
1 answer:
Ber [7]3 years ago
4 0

You should select Choice-4 .

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A firefighting crew uses a water cannon that shoots water at 25.0 m/s at a fixed angle of 53.0° above the horizontal. The fire-f
zysi [14]

Answer:

8.8 m and 52.5 m

Explanation:

The vertical component and horizontal component of water velocity leaving the hose are

v_v = vsin(\alpha) = 25sin(53^0) = 25*0.8 = 19.97 m/s

v_h = vcos(\alpha) = 25cos(53^0) = 25*0.6 = 15 m/s

Neglect air resistance, vertically speaking, gravitational acceleration g = -9.8m/s2 is the only thing that affects water motion. We can find the time t that it takes to reach the blaze 10m above ground level

s = v_vt + gt^2/2

10 = 19.97t - 9.8t^2/2

4.9t^2 - 19.97t + 10 = 0

t= \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

t= \frac{19.9658877511823\pm \sqrt{(-19.9658877511823)^2 - 4*(4.9)*(10)}}{2*(4.9)}

t= \frac{19.9658877511823\pm14.24}{9.8}

t = 3.49 or t = 0.58

We have 2 solutions for t, one is 0.58 when it first reach the blaze during the 1st shoot up, the other is 3.49s when it falls down

t is also the times it takes to travel across horizontally. We can use this to compute the horizontal distance between the fire-fighters and the building

s_1 = v_ht_1 = 15*0.58 = 8.8 m

s_2 = v_ht_2 = 15*3.49 = 52.5m

8 0
3 years ago
Long ago, it was believed that maggots came from meat. In the late 1600s, Francesco Redi hypothesized that maggots came from fli
Lunna [17]
D) Both A and B.

Francisco Redi must use 1)a covered, unrefrigerated meat and 2) an uncovered, refrigerated meat to experiment and test his hypothesis that maggots came from flies rather than from meat.
5 0
3 years ago
Read 2 more answers
What part of the atmosphere contains dust, water vapor, and 75% of all gases
Alexeev081 [22]

Answer:

Troposphere

Explanation:

Our atmosphere yay

7 0
3 years ago
Read 2 more answers
9. Use the following information to answer parts a, b, c and d
N76 [4]

Answer:

iittdhusludepeotlke is the only person who has ever seen a long distance friend from which he is the 3PM and 3AM and I

Explanation:

gt6e6ofkhithodzipfrhFfu0sa6eo5ostiatkstoss ragers the following 3AM is not the only one sentences you have to say about it is not an 2475232347 email from a substance abuse treatment center for a medical professional who is a substance addict or a physician in my life to be 367inches 4 to the end 6th

7 0
3 years ago
What are the units for the spring constant, k?
Mnenie [13.5K]

C. newtons/meter

Explanation:

The unit of spring constant K is newtons/meter.

The spring constant is also known as the stiffness.

    F = k e

F is the force

k is the spring constant

e is the extension.

 The unit of F is newtons

                    e is meters

Therefore, k becomes newtons/meter

  • Stiffness is the resistance to stretch of a body.

learn more:

Force brainly.com/question/3820012

#learnwithBrainly

4 0
4 years ago
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