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3 years ago

Each compound that has at least one element from group 17 is called a _____

Physics

1 answer:

-BARSIC- [3]3 years ago

6 0

I'm pretty sure the answer is a halide. If I'm wrong please let me know. I hope this helps :)

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one layer of earth's atmosphere is called the stratosphere. At one point above earth's surface the stratosphere extends from an

masya89 [10]

According to all the given requirements

stratosphere x starts at an altitude of 16 km

that means

16≤x

 and,as given ,stratosphere ends at an altitude of 30 km:
which means
x≤30 combining both of them we get

16≤x≤30 So the range of the stratosphere is from 16 to 30 km.

8 0

3 years ago

Read 2 more answers

A hot iron ball of mass 200 g is cooled to a temperature of 22°C. 6.9 kJ of heat is lost to the surroundings during the process.

qaws [65]

Heat lost or gained, H = mc(θ₂ - θ₁)
Where m = mass, c = Specific heat capacity, θ₂= final temperature, θ₁ = initial temperature

m = 200g, c = 0.444 J/g°C, θ₁ = 22 °C (Since it was cooled).

H = 6.9 kj = 6.9 *1000J = 6900 J

6900 = 200*0.444* (θ₂ - 22)

6900/(200*0.444) = θ₂ - 22

77.70 = θ₂ - 22

θ₂ - 22 = 77.7

θ₂ = 77.7 + 22 = 99.7

So initial temperature before cooling ≈ 100°C . Option C.

5 0

3 years ago

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A mass of 3.0 kg rests on a smooth surface inclined 34° above the horizontal. It is kept from sliding down the plane by a spring

azamat

Answer:

The spring stretched by x = 13.7 cm

Explanation:

Given data

Mass = 3 kg

k = 120 $\frac{N}{m}$

Angle $\theta$ = 34°

From the free body diagram

Force acting on the box = mg sin $\theta$

⇒ F = 3 × 9.81 × $\sin34$

⇒ F = 16.45 N ------- (1)

Since box is attached with the spring so a spring force also acts on the box.

$F_{sp}$ = k x

$F_{sp}$ = 120 $x$ -------- (2)

The net force acting on the body is given by

$F_{net} = ma$

Since acceleration of the box is zero so

$F_{net} = 0$

$F - F_{sp} = 0$

$F = F_{sp}$

Put the values from equation (1) & (2) we get

16.45 = 120 $x$

x = 0.137 m

x = 13.7 cm

Therefore the spring stretched by x = 13.7 cm

3 0

3 years ago

Now assume that the stream flows east at 4.0 m/s. draw the vectors v⃗ w, representing the velocity of the stream, and v⃗ tot, re

ELEN [110]

Remember that the total velocity of the motion is the vector sum of the velocity you would have in still water and the stream. Always place the vectors carefully to be able to come up with an accurate sum vector.

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3 years ago

A pen contains a spring with a spring constant of 257 N/m. When the tip of the pen is in its retracted position, the spring is c

Mandarinka [93]

Explanation:

Below is an attachment containing the solution.

3 0

3 years ago