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4 years ago

The temperature -273°C is —.

Physics

1 answer:

ArbitrLikvidat [17]4 years ago

4 0

Answer:

-273°C = Absolute zero

Explanation:

Average Kinetic energy of particles in matter refers to the temperature of matter. This value is not arbitrary zero temperature. It explains the lowest kinetic energy of the particles in matter.

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Two airplanes leave an airport at the same time.The velocity of the first airplane is 700 m/h at a heading of 31.3 the velocity

MArishka [77]

Here in order to find out the distance between two planes after 3 hours can be calculated by the concept of relative velocity

$v_{12} = v_1 - v_2$

here

speed of first plane is 700 mi/h at 31.3 degree

$v_1 = 700 cos31.3\hat i + 700 sin31.3\hat j$

$v_1 = 598.12\hat i + 363.7\hat j$

speed of second plane is 570 mi/h at 134 degree

$v_2 = 570 cos134 \hat i + 570 sin134 \hat j$

$v_2 = -396\hat i + 410\hat j$

now the relative velocity is given as

$v_{12} = (598.12 + 396)\hat i + (363.7 - 410)\hat j$

$v_{12} =994.12\hat i -46.3 \hat j$

now the distance between them is given as

$d = v* t$

$d = (994.12 \hat i - 46.3 \hat j)* 3$

$d = 2982.36\hat i - 138.9\hat j$

so the magnitude of the distance is given as

$d = \sqrt{2982.36^2 + 138.9^2}$

$d = 2985.6$ miles

so the distance between them is 2985.6 miles

5 0

3 years ago

Read 2 more answers

Oceans receive freshwater from precipitation and rivers. Yet ocean levels do not change very much from these actions. Why are oc

Neko [114]

Ocean levels are not greatly affected because when water is deposited or received from the ocean, at the same time water is being evaporated from the ocean to condense in the clouds and them form into precipitation.

5 0

3 years ago

Read 2 more answers

Find weight of 45 kg at height 800 km from earth's surface?

Fiesta28 [93]

Answer:

<em>The weight is 348.4 N</em>

Explanation:

<u>Effect of the Altitude on the Acceleration of Gravity</u>

The effect of gravity decreases with altitude because greater altitudes mean greater distances from the Earth's center.

The practical formula to calculate the gravity as a function of the altitude h is:

$g_{h}=g_{0}\left({\frac {R_{\mathrm {e} }}{R_{\mathrm {e} }+h}}\right)^{2}$

Where go is the conventional gravitational acceleration = $9.80665\ m/s^2$

R is the Earth's mean radius at the equator = 6,378 Km

h is the altitude.

At a height of h=800 Km, the acceleration of gravity is:

$g_{h}=9.80665 m/s^2\left(\frac {6,378 Km }{6,378 Km+800Km}}\right)^{2}$

Calculating:

$g_h=7.74\ m/s^2$

The weight is the product of the acceleration of gravity by the mass of the object, thus:

$W=45\ Kg\cdot 7.74\ m/s^2=348.4\ N$

The weight is 348.4 N

8 0

3 years ago

A block of mass m is attached to a spring of constant k, which oscillates over a table without friction. Which of the following

Fofino [41]

Answer:

3. Kinetic energy of the system is maximum when potential energy is minimum.

Explanation:

Given that

Mass of block= m

Spring constant =K

Table is friction less.

As we know that in oscillatory motion ,when kinetic energy is maximum then potential energy will become minimum.

At the mean position:

Kinetic energy is maximum.

Potential energy is minimum.

At the extreme position:

Kinetic energy is minimum.

Potential energy is maximum.

At the mean position velocity of block will be maximum that is why it have maximum kinetic energy and at the extreme position the velocity of block will be minimum that is why it have minimum kinetic energy.

So from above we can say that kinetic energy of the system is maximum when potential energy is minimum.

6 0

4 years ago

A car goes 4 m/s for 10 seconds then speeds up to 12 m/s in

Sladkaya [172]

Explanation:

For 10 seconds, v= d/t

4= d/10

d = 4×10= 40m

For 2 seconds,

V=d/t

12 =d/2

d =12 × 2 =24m

For the last 10 seconds,

S = ut +1/2 at^2

S = 0×10 + 1/2 × - 3 ×10^2

S=-150m

8 0

3 years ago