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2 years ago

14

If you were trying to cross a river with the shortest possible time, would you aim your boat slightly upstream, directly across

the river, or slightly downstream?

1 answer:

Katyanochek1 [597]2 years ago

7 0

I would say downstream since the stream can push your boat, then you would have momentum and would just have to row towards the land.

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If a 140 lb. climber saved her potential energy as she descended from Mt. Everest (Elev. 29,029 ft) to Kathmandu (Elev. 4,600 ft

mamaluj [8]

Answer: 3217.79 hours.

Explanation:

Given, A 140 lb. climber saved her potential energy as she descended from Mt. Everest (Elev. 29,029 ft) to Kathmandu (Elev. 4,600 ft).

Power = 0.4 watt

Mass of climber = 140 lb

= 140 x 0.4535 kg [∵ 1 lb= 0.4535 kg]

⇒ Mass of climber (m) = 63.50 kg

Let $h_1=29,029\ ft= 8848.04\ m\ \ \ \ [ 1 ft=0.3048\ m ]$ and $h_2= 4,600 ft = 1402.08\ m$

Now, Energy saved = $mg(h_1-h_2)=(63.50)(9.8)(8848.04-1402.08)=4633620.91\ J$

$\text{Power}=\dfrac{\text{energy}}{\text{time}}\\\\\Rightarrow 0.4=\dfrac{4633620.91}{\text{time}}\\\\\Rightarrow\ \text{time}=\dfrac{4633620.91}{0.4}\approx11584052.28\text{ seconds}\\\\=\dfrac{11584052.28}{3600}\text{ hours}\ \ \ [\text{1 hour = 3600 seconds}]\\\\=3217.79\text{ hours}$

Hence, she can power her 0.4 watt flashlight for 3217.79 hours.

5 0

3 years ago

What happens to an object's mass as the object's acceleration increases but the force stays the same

Iteru [2.4K]

Answer:

the mass stays the same

Explanation:

the more mass the faster

6 0

3 years ago

Read 2 more answers

Chromosomes from the mother control whether a child is male or female. Please select the best answer from the choices provided.

Marrrta [24]

False it's from both parents
Hope this helps

3 0

3 years ago

Read 2 more answers

An object travels along a right triangle with sides 3 m, 4 m, and 5 m. It returns back to the initial position.

stiv31 [10]

When it travels 3m ,4m and 5m it means 12m is right answer.

3 0

3 years ago

A .2kg Basketball is pitched with a velocity or 40 m/s and then bed and into the picture with a velocity of 60 m/s. What is the

Tamiku [17]

Answer:

40kgm

Explanation:

∆p = m(v - u)

= 2(60 - 40)

= 2 × 20

= 40kgm/s

4 0

3 years ago