All categories

3 years ago

3 + 2 ∙ 4 = 3 + (2 ∙ 4)

Physics

2 answers:

Rzqust [24]3 years ago

6 0

Answer:

11 = 11

Explanation:

AnnZ [28]3 years ago

6 0

Answer:

True

Explanation:

3+2x4=3+(2x4), they both equal 11

You might be interested in

A rock is dropped in a pond, causing circular ripples. The radius increased with a rate 1 foot per second. When the radius is 4

Brrunno [24]

Answer:

true

Explanation:

Area = πr²

Differentiating in respect to r

we get,

dA/dr = 2πr

using chain rule,

$\frac{dA}{dt} = \frac{dA}{dr} .\frac{dr}{dt} = 2\pi \frac{dr}{dt}$

since r = 4feet

so ,

2π(4) = 8π

5 0

3 years ago

Question 18/55 (2 p.)

Readme [11.4K]

Answer:

the correct answer is C v = 60 cm / s

Explanation:

The speed of a wave is related to the frequency and the wavelength

v = λ f

They indicate that the object performs 20 oscillations every second, this is the frequency

f = 20 Hz

the wavelength is the distance until the wave repeats, the distance between two consecutive peaks corresponds to the wavelength

λ = 3 cm = 0.03 m

let's calculate

v = 20 0.03

v = 0.6 m / s

v = 60 cm / s

the correct answer is C

6 0

3 years ago

What is the purpose of the key or legend on a map

lapo4ka [179]

<span>Map Key or Legend. A map key or legend is included with a map to unlock it. It gives you the information needed for the map to make sense. Maps often use symbols or colors to represent things, and the map key explains what they mean</span>

8 0

4 years ago

Does heat rise or fall?? the last person that answered did it just for the points and gave me no real answer

nasty-shy [4]

Heat does not rise or fall because it is an energy being transferred. It is the hot air which rises because colder air is denser than hotter air.

8 0

3 years ago

Read 2 more answers

An above ground swimming pool of 30 ft diameter and 5 ft depth is to be filled from a garden hose (smooth interior) of length 10

STALIN [3.7K]

This question involves the concepts of dynamic pressure, volume flow rate, and flow speed.

It will take "5.1 hours" to fill the pool.

First, we will use the formula for the dynamic pressure to find out the flow speed of water:

$P=\frac{1}{2}\rho v^2\\\\v=\sqrt{\frac{2P}{\rho}}$

where,

v = flow speed = ?

P = Dynamic Pressure = 55 psi $(\frac{6894.76\ Pa}{1\ psi})$ = 379212 Pa

$\rho$ = density of water = 1000 kg/m³

Therefore,

$v=\sqrt{\frac{2(379212\ Pa)}{1000\ kg/m^3}}$

v = 27.54 m/s

Now, we will use the formula for volume flow rate of water coming from the hose to find out the time taken by the pool to be filled:

$\frac{V}{t} = Av\\\\t =\frac{V}{Av}$

where,

t = time to fill the pool = ?

A = Area of the mouth of hose = $\frac{\pi (0.015875\ m)^2}{4}$ = 1.98 x 10⁻⁴ m²

V = Volume of the pool = (Area of pool)(depth of pool) = A(1.524 m)

V = $[\frac{\pi (9.144\ m)^2}{4}][1.524\ m]$ = 100.1 m³

Therefore,

$t = \frac{(100.1\ m^3)}{(1.98\ x\ 10^{-4}\ m^2)(27.54\ m/s)}\\\\$

<u>t = 18353.5 s = 305.9 min = 5.1 hours</u>

Learn more about dynamic pressure here:

brainly.com/question/13155610?referrer=searchResults

7 0

3 years ago