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aleksklad [387]
3 years ago
15

Mary needs to row her boat across a 190 m -wide river that is flowing to the east at a speed of 1.3 m/s . mary can row with a sp

eed of 3.5 m/s . part a if mary points her boat due north, how far from her intended landing spot will she be when she reaches the opposite shore?
Physics
1 answer:
Anarel [89]3 years ago
3 0
<span>If Mary is rowing at 3.5 m/s then it will take her 190 m divided by 3.5 m/s or about 54 secs to cross the river. If the river is flowing at 1.3 m/s then in 54 secs she will be carried 54 x 1.3 or around 70.5 meters downstream when she lands on the opposite shore.</span>
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In the Daytona 500 auto race, a Ford Thunderbird and a Mercedes Benz are moving side by side down a straightaway at 71.0 m/s. Th
elena55 [62]

<u>Answer:</u>

<em>Thunderbird is 995.157 meters behind the Mercedes</em>

<u>Explanation:</u>

It is given that all the cars were moving at a speed of 71 m/s when the driver of Thunderbird  decided to take a pit stop and slows down for 250 m. She spent 5 seconds  in the pit stop.

Here final velocity v=0 \ m/s

initial velocity u= 71 m/s  distance  

Distance covered in the slowing down phase = 250 m

v^2-u^2=2as

a= \frac {(v^2-u^2)}{2s}

a = \frac {(0^2-71^2)}{(2 \times 250)}=-10.082 \ m/s^2

v=u+at

t= \frac {(v-u)}{a}

= \frac {(0-71)}{(-10.082)}=7.042 s

t_1=7.042 s

The car is in the pit stop for 5s t_2=5 s

After restart it accelerates for 350 m to reach the earlier velocity 71 m/s

a= \frac {(v^2-u^2)}{(2\times s)} = \frac{(71^2-0^2)}{(2 \times 370)} =6.81 \ m/s^2

v=u+at

t= \frac{(v-u)}{a}

t= \frac{(71-0)}{6.81}= 10.425 s

t_3=10.425 s

total time= t_1 +t_2+t_3=7.042+5+10.425=22.467 s

Distance covered by the Mercedes Benz during this time is given by s=vt=71 \times 22.467= 1595.157 m

Distance covered by the Thunderbird during this time=250+350=600 m

Difference between distance covered by the Mercedes  and Thunderbird

= 1595.157-600=995.157 m

Thus the Mercedes is 995.157 m ahead of the Thunderbird.

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3 years ago
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t  = 0.527 s

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<u>Explanation:</u>

We use the formula:

v = u+at

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a=201 \mathrm{m} / \mathrm{s}^{2}

So applying the formula,

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106 = 0 + 201t

t     = 106/201

t     = 0.527 s

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3 years ago
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baherus [9]

Answer:

Photosynthesis is the pocess by which green plants make their own food.

b. sunlight, glucose, water, altra-violet ray as catalyst

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Answer:

the answer is B

Explanation:

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