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4 years ago

What best describes desert pavements

Physics

1 answer:

Gekata [30.6K]4 years ago

3 0

Answer:

Explanation:

A common theory suggests that desert pavements are formed through gradual removal of sand and other fine particles by the wind and intermittent rains leaving behind the large fragments. The larger rock particles are shaken into place by actions of different agents such as rain, wind, gravity, and animals

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A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (25 degrees C) a

Sphinxa [80]

Answer:

$\eta=0.067$

Explanation:

Given that

Temperature of warm water ,T₁ = 25 °C

Temperature of cold water ,T₂ = 5 °C

The maximum possible efficiency of any heat is will be same as the efficiency of the Carnot heat engine.Therefore the maximum efficiency of OTEC system is given as follows

$\eta=1-\dfrac{T_2}{T_1}$

T should be Kelvin scale

Now by putting the values

$\eta =1-\dfrac{5+273}{25+273}$

$\eta=0.067$

Therefore the maximum efficiency will be 0.067 or 6.7%.

8 0

3 years ago

If two opposing forces are equal, then the net force is 0 N.<br><br> true or false?

Fofino [41]

Answer:

false

Explanation:

6 0

3 years ago

A stuntman with a mass of 82.5 kg swings across a pool of water from a rope that is 12.0 m. At the bottom of the swing the stunt

Brilliant_brown [7]

Answer:

The stuntman will not make it

Explanation:

At the bottom of the swing, the equation of the forces acting on the stuntman is:

$T-mg = m\frac{v^2}{r}$

where:

T is the tension in the rope (upward)

mg is the weight of the man (downward), where

m = 82.5 kg is his mass

$g=9.8 m/s^2$ is the acceleration due to gravity

$m\frac{v^2}{r}$ is the centripetal force, where

v = 8.65 m/s is the speed of the man

r = 12.0 m is the radius of the circule (the length of the rope)

Solving for T, we find the tension in the rope:

$T=mg+m\frac{v^2}{r}=(82.5)(9.8)+(82.5)\frac{8.65^2}{12.0}=1322 N$

Since the rope's breaking strength is 1000 N, the stuntman will not make it.

4 0

3 years ago

Name two factors that can affect the function of an enzyme

myrzilka [38]

Answer:

1. pH

2. Temperature

Hope this helps

3 0

3 years ago

1. Consider a circular track with a radius of 200 meters. A runner starts on the east side and runs around the track to a point

ladessa [460]

Answer:

The magnitude of her displacement when at a point diametrically opposite her starting point is 400 meters

After she has returned to her starting point, the magnitude of her displacement is zero

Explanation:

Displacement is a vector quantity defined as the length of the shortest path between the final and the initial points. In other words, displacement can be defined as the distance traveled in a straight line.

From the question,

The circular track has a radius of 200 meters.

The runner starts on the east side to a point diametrically opposite her starting point. The diametrically opposite point is the point at the opposite end of the diameter of the circle.

Hence, her displacement ( that is, the length of the shortest path between her final and her initial points) is the length of the diameter of the circle.

Diameter d, of a circle is given as twice the radius r, of the circle.

That is, d = 2r

Radius r, of the circular track is 200 meters

∴ d = 2r = 2 (200 meters)

d = 400 meters

Hence, her displacement when at a point diametrically opposite her starting point is 400 meters

Now, after she has returned to her starting point, the magnitude of her displacement is zero.

This is because, the length between her final point ( which is the same as her initial point) and her initial point in zero.

7 0

3 years ago