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Feliz [49]
3 years ago
5

Connie flew from Phoenix to flagstaff, a distance of 180 miles at a constant speed of 180 miles per hour. She then returned to t

he same airport at a stand speed of 90. Miles per hour. What was Connie average speed in miles/ hour
Physics
1 answer:
zzz [600]3 years ago
5 0

Answer:

120 miles/hour

Explanation:

The average speed is the ratio of total distance covered by an object or a body to the total time taken to cover the distance.

Mathematically,

    <em>Average speed = total distance covered/total time taken</em>

In the case of Connie:

total distance = 180 + 180 = 360 miles

In order to calculate the time for each trip

<em>speed = distance/time</em>

<em>   time = distance/speed</em>

From Phoenix to flagstaff:

  time = 180/180 = 1 hour

From flagstaff back to Phoenix:

  time = 180/90 = 2 hours

total time taken = 1 + 2 = 3 hours

Average speed = 360/3 = 120 miles/hour

<em>Hence, the average speed is </em><em>120 miles per hour.</em>

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a toy car travels from A to B at constant speed 30km/hr and without stopping at B return A at constant speed v. if the average s
adelina 88 [10]

Answer:

Speed BA = 18 km/hr.

Explanation:

Given the following data;

Speed AB = 30km/hr

Speed BA = x km/hr

Average speed = 24 km/hr

To find the value of x;

Average speed = (Speed AB + Speed BA)/2

Substituting into the equation, we have

24 = (30 + x)/2

48 = 30 + x

x = 48 - 30

x = 18 km/hr

4 0
3 years ago
. 30
schepotkina [342]

Answer:

Explanation:

Length if the bar is 1m=100cm

The tip of the bar serves as fulcrum

A force of 20N (upward) is applied at the tip of the other end. Then, the force is 100cm from the fulcrum

The crate lid is 2cm from the fulcrum, let the force (downward) acting on the crate be F.

Using moment

Sum of the moments of all forces about any point in the plane must be zero.

Let take moment about the fulcrum

100×20-F×2=0

2000-2F=0

2F=2000

Then, F=1000N

The force acting in the crate lid is 1000N

Option D is correct

7 0
3 years ago
What volume of h2 gas (in l), measured at 756 mmhg and 90 ∘c, is required to synthesize 23.0 g ch3oh?
Naddika [18.5K]

First let us calculate for the moles of CH3OH formed:

moles CH3OH = 23 g / (32 g / mol) = 0.71875 mol

We see that there are 2 moles of H2 per mole of CH3OH, so:

moles H2 = 0.71875 mol * 2 = 1.4375 mol

 

Assuming ideal gas behaviour, we use the formula:

PV = nRT

V = nRT / P

V = 1.4375 mol * (62.36367 L mmHg / mol K) * (90 + 237.15 K) / 756 mm Hg

<span>V = 43.06 Liters</span>

6 0
3 years ago
Which is true of the greenhouse effect?
Aleksandr [31]

Answer:

c is correct option thanks to brainly

3 0
3 years ago
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pshichka [43]

Answer:a

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