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alisha [4.7K]
3 years ago
7

A river flows due south at 4 mi/h. A swimmer attempting to cross the river heads due east swimming at 2 mi/h relative to the wat

er. Find the true velocity of the swimmer as a vector. (Assume that the i vector points east, and the j vector points north.)
Mathematics
1 answer:
Inessa05 [86]3 years ago
5 0

Answer:

\overrightarrow{V_{S,G}}=2\widehat{i}-4\widehat{j} mi/h

Step-by-step explanation:

velocity of river with respect to ground = 4 mi/h south

\overrightarrow{V_{R,G}}=4(\widehat{-j})

Velocity of swimmer with respect to river = 2 mi/h east

\overrightarrow{V_{S,R}}=2(\widehat{i})

According to the formula of relative velocity

\overrightarrow{V_{S,R}}=\overrightarrow{V_{S,G}}-\overrightarrow{V_{R,G}}

2\widehat{i}=\overrightarrow{V_{S,G}}+4\widehat{j}

Where, V(S,G) be the velocity of swimmer with respect to ground, it is true velocity of swimmer.  

\overrightarrow{V_{S,G}}=2\widehat{i}-4\widehat{j} mi/h

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Answer:

The lateral surface area of a cuboid is 180 units² .

Option (c) is correct.

Step-by-step explanation:

Formula

Lateral surface area of a cuboid = 2hl + 2hb

Where h is the height , l is the length and b is the breadth.

As shown in the figure.

Length = 4 units

Breadth = 5 units

Height =  10 units

Put in the formula

Lateral surface area of a box = 2 × 10 × 4 + 2 × 10 × 5

                                                = 80 + 100

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Therefore the lateral area of the cuboid is 180 units² .

Option (c) is correct.

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3 years ago
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Aleks [24]
x:1.2\\\\x=40.8\to40.8:1.2=34

4 0
3 years ago
A bike is bought for $1200 and sold 10 months later for $940.
Stolb23 [73]

Value

Depreciation is defined as the reduction in value of an asset over time. In this case, value reduction is due to wear and tear of an equipment (bicycle).

a. The depreciation value would simply be the difference in initial and salvage value divided by time in years.

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Step-by-step explanation:

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Answer:

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\var{v}=75\: miles/h

Step-by-step explanation:

The average speed equation is given by:

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I hope it helps you!

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