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3 years ago

HURRY ITS TIMED

Physics

2 answers:

VLD [36.1K]3 years ago

8 0

Answer:

Explanation:

I looked it up for you to help you out and it said it was d

sesenic [268]3 years ago

5 0

Answer:

The correct answer is D. We served cake to children in silver bowls.

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Which of the following causes clouds to develop over the ocean?

olasank [31]

I think it is B.Thermal energy decreases as water vapor rises from the ocean

4 0

3 years ago

Read 2 more answers

8. A jaguar runs 4200 meters at the speed of 400 meters per minute. How

ollegr [7]

Answer:

10.5min

Explanation:

Given parameters:

Distance = 4200m

Speed = 400m/min

Unknown:

Time taken for this run = ?

Solution:

Speed is the distance divided by the time taken.

Speed = $\frac{distance }{time }$

Time = $\frac{distance}{speed }$

Now insert the parameters and solve;

Time = $\frac{4200}{400}$ = 10.5min

7 0

3 years ago

A piano wire with mass 2.60g and length 84.0 cm is stretched with a tension of 25.0 N. A wave with frequency 120.0 Hz and amplit

likoan [24]

Answer:

Power will be 0.2023 watt

And when amplitude is halved then power will be 0.0505 watt

Explanation:

We have given mass of the Piano wire m = 2.60 gram = 0.0026 kg

Length of wire l = 84 cm = 0.84 m

So mass density $\mu =\frac{m}{l}=\frac{0.0026}{0.84}=0.0031kg/m$

Tension in the wire T = 25 N

Frequency f = 120 Hz

So angular frequency $\omega =2\pi f=2\times 3.14\times 120=753.6rad/sec$

And amplitude A = 1.6 mm = 0.0016 m

We have to find the generated power

Power is given by $P=\frac{1}{2}\sqrt{\mu T}\omega ^2A^2=\frac{1}{2}\times \sqrt{0.0031\times 25}\times 753.6^2\times 0.0016^2=0.2023watt$

From the relation we can see that power $P\ \propto\ A^2$

So if amplitude is halved then power will be $\frac{1}{4}$ times

So power will be equal to $\frac{0.2023}{2}=0.0505watt$

4 0

3 years ago

At t = 0, Ball 1 is dropped from the top of a 22 m-high building. At the same instant Ball 2 is thrown straight up from the base

Crazy boy [7]

Answer:

The two balls pass each other at a height of 5.53 m

vf1=17.97 m/s

vf2=-5.96 m/s

Explanation:

Vertical Motion

An object thrown from the ground at speed vo, is at a height y given by:

$y=vo.t-g.t^2/2$

Where t is the time and $g=9.8\ m/s^2$

Furthermore, an object dropped from a certain height h will fall a distance y, given by:

$y=g.t^2/2$

Thus, the height of this object above the ground is:

$H = h-g.t^2/2$

The question describes that ball 1 is dropped from a height of h=22 m. At the same time, ball 2 is thrown straight up with vo=12 m/s.

We want to find at what height both balls coincide. We'll do it by finding the time when it happens. We have written the equations for the height of both balls, we only have to equate them:

$vo.t-g.t^2/2=h-g.t^2/2$

Simplifying:

$vo.t=h$

Solving for t:

$t=h/vo=22/12=1.833\ s$

The height of ball 1 is:

$H = 22-9.8.(1.833)^2/2$

H = 5.53 m

The height of ball 2 is:

$y=12\cdot(1.833)-9.8\cdot(1.833)^2/2$

y=5.53 m

As required, both heights are the same.

The speed of the first ball is:

$vf1=g.t=9.8\cdot 1.833=17.97\ m/s$

vf1=17.97 m/s

The speed of the second ball is:

$vf2=vo-gt=12-9.8\cdot 1.833=-5.96\ m/s$

vf2=-5.96 m/s

This means the second ball is returning to the ground when both balls meet

3 0

3 years ago

Make a list of all the possible human sources of carbon dioxide

ioda

Answer:

car fuel

production waste (like producing plastic, car, materials)

breathing

landfill

cement production

deforestation (cutting down trees)

burning of fossil fuels (coals, oil, natural gases)

Please mark Brainliest

Explanation:

7 0

3 years ago