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4 years ago

Quantities must have different units before they can be added or subtracted.

1 answer:

7 0

The statement, Quantities must have different units before they can be added or subtracted, is false. You need to note when you add or subtract units, they must be first homogenous or the same. In conversion factors, always check for the units. Suppose that you are given the area of a certain house which is 164m2. You are asked to find it in square feet. You will need to multiply 0.305m by itself to get m2. You have (0.305m)^2 is equal to 0.093025ft2. Now you have an equivalent factor of 1ft2 is equal to 0.093025ft2. After that, divide 164m2 by 0.093025ft2 and you will get 1762.97ft2.

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A closed cylindrical tank of radius 3.5 m and height 2m is made from

Dahasolnce [82]

Explanation:

Total surface area of cylinder:

$2\pi \times r(h + r) \\ 2 \times \pi \times 3.5(3.5 + 2) \\ 2\pi \times 19.25 = 120.951317 \\ 120.95 \: {cm}^{2}$

sheet of metal required = 120.95 cm^2

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3 years ago

Read 2 more answers

A ladder 7.85 m long leans against the side of a building. If the ladder is inclined at an angle of 79.5° to the horizontal, wha

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4 years ago

AreaAgNO3 + ___Response area_Li →_____Response areaLiNO3 +____Response areaAg

Solnce55 [7]

Answer:

1 is 3 -1

Explanation:

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3 years ago

2. A box filled with books has a mass of 15.0 kg. It is pushed across the floor with a constant force of 60.0 N. If the friction

sesenic [268]

Answer:

$3 m/s^{2}$

Explanation:

ΣF=ma

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3 years ago

What frequency is received by a stationary mouse just before being dispatched by a hawk flying at it at 24.7 m/s and emitting a

Montano1993 [528]

Answer:

f' = 3665.51 Hz

Explanation:

given,

speed of the hawk = 24.7 m/s

frequency of screech emitted by the hawk = 3400 Hz

speed of sound = 331 m/s

By Doppler's effect

$f' = (\dfrac{v}{v-v_s}})f$

f' is the frequency received by the mouse

v is the speed of the sound

v_s is the speed of the hawk

now,

$f' = \dfrac{341}{341-24.7}}\times 3400$

f' = 1.078 x 3400

f' = 3665.51 Hz

The frequency received by the stationary mouse is equal to 3665.51 Hz

6 0

3 years ago