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nadya68 [22]
1 year ago
8

24) a plane takes off at 7:00 pm and lands at 1:00 am after travelling a distance of 4818km. what is the minimum number of times

that the airplane was travelling at 800 km/h (if any)? justify your answer.
Physics
1 answer:
12345 [234]1 year ago
7 0

Answer:

Twice

Step-by-Step Explanation:

Time between 7:00 PM and 1:00 AM: 6 hours

Distance: 4818km

Since the distance is 4818km, and the time is 6 hours, you divide 4818 by 6.

803.0000015999 km/h.

The average speed is 803 km/h

Which considering the ideal case scenario if the plane starts at 0 reaches the speed of 803 and the end reduces its speed from 803 to 0. This means we have come across the value of 800 at least twice. Hence, the plane was travelling at a speed of 800 km/h at least 2 times.

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If the bonds in the reactants of Figure 7-3 contained 432 kJ of chemical energy and the bonds in the
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Answer:

  • <u>The energy change would be 46kJ</u>
  • <u>The energy would be absorbed</u>

Explanation:

The <em>energy change </em>during a chemical reation, i.e. the reaction energy, is equal to the chemical energy stored in the<em> bonds of the products </em>less the chemical energy stored in the <em>bonds of the reactants</em>.

Hence:

  • <em>Energy change</em> = 478 kJ - 432kJ = 46kJ

The change is positive, this is, the chemical energy of the products is greater than the chemical energy of the reactants.

That corresponds to the second graph, where the level of the energy of the products in the graph is higher than the level of the energy of the reactants. Therefore, the conclusion is that the reaction <em>absorbed energy</em> and it is endothermic.

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3 years ago
Iron + Hydrochloric acid --&gt; ?
marusya05 [52]
<h3>Iron - Fe</h3>

<h3>Hydrochloric Acid- HCl</h3>

<h2><u>Solution</u></h2>

\bold{Fe  +2HCl \rightarrow FeCl _{}{ \tiny2}  + H{ \tiny{2}}}

\therefore \bold{\fbox{{Balanced}}}

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8 0
3 years ago
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A boat with an anchor on board floats in a swimming pool that is somewhat wider than the boat. Does the pool water level move up
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Answer:

a) moves down

b) moves down

c) level remains same

Explanation:

Given that the anchor is initially on the floating boat.

a)

In this condition initially the the volume of water (V_w_i) displaced is to balance its weight.

Now,

W_a=W_w

V_a.\rho_a.g=V_w_i.\rho_w.g

\frac{\rho_a}{\rho_w} =\frac{V_w_i}{V_a}

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\therefore V_w_i=7.85\times V_a

When the anchor is dropped into water:

The volume of water displaced be (V_w_f) which will be equal to the volume of anchor since it is immersed into it.

V_a=V_w_f

\therefore V_w_i>V_w_f ...................(1)

So the level of water falls when the anchor is dropped into water.

b)

Now, when the anchor is thrown on the ground the water has now less weight to balance so the water level falls down.

c)

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Explanation:

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Given voltage and current, the power may be calculated by multiplying them. 
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The numerical value of the operation above is 118400000 watts. Thus, the answer is letter C. 
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