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3 years ago

How does freezing and evaporation affect salinity?

Physics

1 answer:

Gnoma [55]3 years ago

8 0

The answer is C, because the water molecules are evaporating and the salt molecules are staying the same.

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A car accelerates from 13 m/s to 25 m/s in 5.0 s. assume constant acceleration. what was its acceleration?

natima [27]

<span>a = 25-13/6 = 12/6 = 2 m/s^2
Av speed: 25+13/2 = 38/2 = 19 m/sec
Dist = speed * time
19 * 6 = 114 meters</span>

8 0

3 years ago

Under water, Zachary can hear waves that travel with frequencies up to 15,000 Hz. What is the velocity of sound in water if a wa

harina [27]

Answer:

18 000 m/ s

Explanation:

speed = wavelength * frequency

speed = 1.2 * 15 000 = 18 000 m/s

4 0

2 years ago

A 60kg60 kg board that is 6 m6 m long is placed at the edge of a platform, with 4 m4 m of its length extending over the edge. Th

scoundrel [369]

Complete Question

The complete question is shown on the first and second uploaded image

Answer:

The minimum mass of $M_1 = 90\ kg$ correct option is E

Explanation:

Free body diagram of the set up in the question is shown on the third uploaded image

The mass of board is $M = 60kg$

The length of the board is $L = 6 \ m$

The length extending over the edge is $L_e = 4 \ m$

The second mass is $M_2 = 30kg$

Now to obtain $M_1$ we take moment about the edge of the platform

$M_1 g L_1 = Mg \frac{L}{2} + M_2 g L_2$

$M_1 L_1 = M \frac{L}{2} + M_2 L_2$

Substituting value

$M_1 (2) = (60)(1) + (30)(4)$

$M_1 = 90 \ kg$

8 0

4 years ago

Deimos's Orbit. Deimos orbits Mars at a distance of 23,460 km from the center of the planet and has a period of 1.263 days. Assu

mihalych1998 [28]

Answer:

M = 5.882 10²³ kg

Explanation:

Let's use Newton's second law to analyze the satellite orbit around Mars.

F = m a

force is universal attraction and acceleration is centripetal

a = v²/ R

the modulus of velocity in a circular orbit is constant

v= d/T

the distance of the cicule is

d =2pi R

a = 2pi R/T

we substitute

- G m M / R² = m ( $- \frac{4\pi^2 R^2 }{T^2 R}$ )

G M = $\frac{ 4\pi ^2 R^3 }{T^2 }$

M = $\frac{4 \pi ^2 R^3 }{ G T^2 }$

the distance R is the distance from the center of the planet Mars to the center of the satellite Deimos

R = 23460 km = 2.3460 10⁷ m

the period of the orbit is

T = 1,263 days = 1,263 day (24 h / 1 day) (3600s / h)

T = 1.0912 10⁵ s

let's calculate

M = $\frac{4 \pi ^2 ( 2.3460 \ 10^7)^3 }{5.67 10^{-11} \ (1.0912 \ 10^5)^2 }$

M = 509.73418 10²¹ /8.66640 10⁻¹

M = 58.817 10²² kg

M = 5.882 10²³ kg

4 0

3 years ago

The most common elements in the Earth’s crust are rarely found on their own. They are usually found combined. Suggest why this i

GaryK [48]

Answer:

Because there are other elements that get in touch with it. And over time with, evolution, erosion and temperature their particles tend to mix. So what once was very common became mixed over time.

7 0

3 years ago