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3 years ago

A hot air balloon exerts a force of 1200 N while

Physics

1 answer:

ValentinkaMS [17]3 years ago

4 0

Answer:

Explanation:

For the explained scenario in the free body force diagram definitely the two forces 1200 N and 800 N should present as they are the acting forces

So A & D rules out.

Then you must think of B & C.

You also know that the weight of the load is always acting downwards as that force is generated by gravitational field of Earth. So 800 N should be downwards not upwards. That rules out B.

So answer is C

(Free body diagram is shown in the graph)

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Which of the following would act as a barrier to sound waves?

Y_Kistochka [10]

Headphones and earplugs

4 0

3 years ago

At what depth of lake water is the pressure equal to 201kpa?

Alex787 [66]

Answer:

20m

Explanation:

Pressure = pgh

p = density of water 1000

kg/m^3

g = acceleration due to gravity 9.81 m/s^2

h is the depth of water

Pressure = 201 kPa = 201 x 10^3 Pa

201 x 10^3 = 1000 x 9.81 x h

201 x 10^3 = 9810h

h = 20.49 m

Approximately 20 m

5 0

3 years ago

Can someone please help me with this

SashulF [63]

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3 0

3 years ago

At what speed, as a fraction of c, will a moving rod have a length 65% that of an identical rod at rest

dezoksy [38]

Answer:

v/c = 0.76

Explanation:

Formula for Length contraction is given by;

L = L_o(√(1 - (v²/c²))

Where;

L is the length of the object at a moving speed v

L_o is the length of the object at rest

v is the speed of the object

c is speed of light

Now, we are given; L = 65%L_o = 0.65L_o, since L_o is the length at rest.

Thus;

0.65L_o = L_o[√(1 - (v²/c²))]

Dividing both sides by L_o gives;

0.65 = √(1 - (v²/c²))

Squaring both sides, we have;

0.65² = (1 - (v²/c²))

v²/c² = 1 - 0.65²

v²/c² = 0.5775

Taking square root of both sides gives;

v/c = 0.76

6 0

3 years ago

The lift raises a car of mass 850 kg to a height of 2.1 m. It uses a force of 8330 N and takes 4 seconds to raise the car. What

expeople1 [14]

As we know that rate of work done is known as power

so here work done is given by

$W = F.d$

$F = 8330 N$

$d = 2.1 m$

now we will have

$W = 8330(2.1) J$

$W = 17493 J$

Now here we will have

$Power = \frac{work}{time}$

$Power = \frac{17493}{4} Watt$

$Power = 4373.25 Watt$

7 0

3 years ago