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svet-max [94.6K]

3 years ago

13

The figure below shows two forces A=15 N and B=5 N acting on an object. What is the

1 answer:

alexandr1967 [171]3 years ago

7 0

Answer:

18.03 N

Explanation:

From the fiqure below,

Using parallelogram law of vector

R² = 15²+5²-2×5×15cos(180-60)

R² = 225+25-150cos120°

R² = 250-150(-0.5)

R² = 250+75

R² = 325

R = √325

R = 18.03 N

Hence the resultant force of the object is 18.03 N

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How many coulombs of positive charge are there in 4kg of plutonium, given its atomic mass is 244 and that each plutonium atom ha

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3 years ago

While at the county fair, you decide to ride the Ferris wheel. Having eaten too many candy apples and elephant ears, you find th

Dovator [93]

Answer:

Explanation:

From the given information:

radius = 15 m

Time T = 23 s

a) Speed (v) = $\dfrac{2 \pi r}{T}$

$v = \dfrac{2\times \pi \times 15}{23}$

v = 4.10 m/s

b) The magnitude of the acceleration is:

$a = \dfrac{v^2}{r} \\ \\ a = \dfrac{(4.10)^2}{15}$

a = 1.12 m/s²

c) True weight = mg

Apparent weight = normal force

From the top;

the normal force = upward direction,

weight is downward as well as the acceleration.

true weight - normal force = ma

apparent weight =mg - ma

$\dfrac{apparent \ weight}{true \ weight} = \dfrac{(mg - ma)}{(mg)}$

$=1- \dfrac{1.12}{9.8}$

= 0.886 m/s²

d)

From the bottom;

acceleration is upward, so:

apparent weight - true weight = ma

apparent weight = true weight + ma

$\dfrac{apparent \ weight }{true \ weight} =\dfrac{ mg + ma}{mg}$

$\dfrac{apparent \ weight }{true \ weight} =1+ \dfrac{a}{g} \\ \\ = 1 + \dfrac{1.12}{9.8}$

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3 years ago

As you drive away from a radio transmitter, the radio signal you receive from the station is shifted to longer wavelengths.True

Eddi Din [679]

Answer:

True

Explanation:

The radio transmitter generates the radio frequency

As you move away from the radio transmitter, the radio frequency decreases

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As the frequency decreases the wavelength of the radio signal increases

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3 years ago

Sally wants to accelerate her car, how fast will her 1500 kg car accelerate if it produces 5000 N of force?

Ilia_Sergeevich [38]

Answer:

F= Mass × acceleration
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3 years ago