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Orlov [11]
3 years ago
8

If you push hard enough to make a scale read 9 pounds, that is about 40 Newtons. So Newtons are a smaller unit... True or False

Physics
1 answer:
Evgesh-ka [11]3 years ago
3 0

True.

Why?

To know if the statement is true or false, we just need to use the following convertion factor:

1lb(force)=4.44N

or

1N=0.22lbf

Now, converting from pounds to Newtons, we have:

9lb*\frac{4.44N}{1lb}=39.96lb=40lb

Hence, the statement is true.

Have a nice day!

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A boat with a weight of 547 newtons is floating in a harbor. What is the buoyant force on the boat?
Veronika [31]

Answer:

a

Explanation:

its correct

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3 years ago
A girl is swinging on a rope. Does the rope supporting the swing act on the girl at the very top of her swing?
kondaur [170]
Yes yes yes yes yes yes yes yes
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An airplane flying at an altitude of 6 miles passes directly over a radar antenna. When the airplane is 10 miles away (s = 10),
Novosadov [1.4K]

Answer:

Explanation:

Given

altitude of the Plane h=6\ miles

When Airplane is s=10\ miles away

Distance is changing at the rate of \frac{\mathrm{d} s}{\mathrm{d} t}=290\ mph

From diagram we can write as

h^2+x^2=s^2

differentiate above equation w.r.t time

2h\frac{\mathrm{d} h}{\mathrm{d} t}+2x\frac{\mathrm{d} x}{\mathrm{d} t}=2s\frac{\mathrm{d} s}{\mathrm{d} t}

as altitude is not changing therefore \frac{\mathrm{d} h}{\mathrm{d} t}=0

0+x\frac{\mathrm{d} x}{\mathrm{d} t}=s\frac{\mathrm{d} s}{\mathrm{d} t}

at s=10\ miles\ and\ h=6\ miles

substitute the value we get x=\sqrt{10^2-6^2}=8\ miles

8\times \frac{\mathrm{d} x}{\mathrm{d} t}=10\times 290

\frac{\mathrm{d} x}{\mathrm{d} t}=362.5\ mph

5 0
4 years ago
4. Una cuerda de acero de piano mide 1.60 m de longitud y 0.20 cm de diámetro. ¿Cuál es la tensión en la cuerda si se estira 0.2
bazaltina [42]

Answer:

1030.83\ \text{N}

Explanation:

\Delta L = Cambio en la longitud de la cuerda = 0.25 cm

T = tensión en cuerda

A = Área de la cadena = \dfrac{\pi}{4}d^2

d = Diámetro de la cuerda = 0.2 cm

L = Longitud original de la cuerda = 1.6 m

El cambio de longitud de una cuerda viene dado por

\Delta L=\dfrac{TL}{AE}\\\Rightarrow T=\dfrac{\Delta LAE}{L}\\\Rightarrow T=\dfrac{0.25\times 10^{-2}\times \dfrac{\pi}{4}(0.2\times 10^{-2})^2\times 210\times 10^9}{1.6}\\\Rightarrow T=1030.84\ \text{N}

La tensión en la cuerda es 1030.84\ \text{N}.

8 0
3 years ago
Convert 13.1 miles to feet. Using one step conversion
Marat540 [252]

Answer:

69,168 ft

Explanation:

6 0
3 years ago
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