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3 years ago

If a 65-kilogram astronaut exerts a force with a magnitude of

Physics

1 answer:

nalin [4]3 years ago

7 0

50N.

The magnitude of the reaction to any force is equal to the magnitude of the first force. (See Newton #3.)

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According to the law of conservation of energy, which statement must be

RoseWind [281]

Answer:

<h2>1 st statement is correct </h2>

Explanation:

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside

<h2>hope you understand and got your answer by my explanation </h2><h2>thanks </h2>

<h2>please give brainliest plz follow </h2>

8 0

3 years ago

3. A copper rod is 3 m long at a certain temperature. Calculate its length for a temperature rise of 100K

Paul [167]

Answer:

-43

Explanation:

6 0

3 years ago

To keep the calculations fairly simple, but still reasonable, we shall model a human leg that is 92.0 cm long (measured from the

Karolina [17]

Answer:

40.44 cm

Explanation:

Our starting point of the coordinates is adjusted in the hip joint.

$X_{cm} = \frac{X_1 m_1 + X_2 m_2}{m_1+m_2}$

Where,

$X_1=23 cm$ Location of mass 1

$m_1=8.6kg$ mag of mass 1

$X_2=69cm$ location of mass 2

$m_2=5.25kg$ mag of mass 2

$X_{cm}=\frac{23*8.6+69*5.25}{8.6+5.25}$

$X_{cm}=40.44 cm$

4 0

4 years ago

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 gold fish weighing 13g has a speed of 8.8m/s. What is its Kinetic energy

sasho [114]

Answer:

0.47 J

Explanation:

3 0

3 years ago