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3 years ago

270000 round into 2 significant figures270000 round into 3 significant figures

Physics

1 answer:

andrew-mc [135]3 years ago

7 0

Answer:

270000 round into 2 significant figures

= 2.7 × 10⁵

Thus, 2 and 7 are significant figures.

270000 round into 3 significant figures

= 2.70 × 10⁵

Thus, 2, 7 and 0 are significant figures.

<u>-</u><u>TheUnknownScientist</u>

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Oscilaţia are un caracter ... , mişcarea se repetă aproape identic după un ... De timp. B) Dacă amplitudinea oscilaţiei rezultan

LenaWriter [7]

Answer:

sorry im english

Explanation:

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3 years ago

A new ride being built at an amusement park includes a vertical drop of 126.5 meters. Starting from rest, the ride vertically dr

yan [13]

Answer:

49.79 m/s

Explanation:

Given:

Initial velocity of the roller coaster is, $u=0\ m/s$

Vertical drop or the displacement of the roller coaster is, $y=-126.5\ m$

The displacement is negative as the motion is in downward direction.

Now, as the motion is in vertical direction only, the acceleration of the roller coaster will be due to gravity acting in the downward direction.

So, the acceleration of the roller coaster is, $a=g=-9.8\ m/s^2$

Now, using the following equation of motion:

$v^2=u^2+2ay$

Where, 'v' is the velocity of the roller coaster at the bottom.

Plug in all the given values and solve for 'v'. This gives,

$v^2=0^2+2(-9.8)(-126.5)\\\\v^2=2479.4\\\\v=\sqrt{2479.4}\\\\v=49.79\ m/s$

Therefore, the speed of the roller coaster at the bottom of the drop is 49.79 m/s.

7 0

3 years ago

Q C Ganymede is the largest of Jupiter's moons. Consider a rocket on the surface of Ganymede, at the point farthest from the pla

guapka [62]

The answer is $v=15.6 \mathrm{~km} / \mathrm{s}$ .

<h3>What is kinetic energy?</h3>

A particle or an item that is in motion has a sort of energy called kinetic energy. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force.
Kinetic energy comes in five forms: radiant, thermal, acoustic, electrical, and mechanical.
The energy of a body in motion, or kinetic energy (KE), is essentially the energy of all moving objects. Along with potential energy, which is the stored energy present in objects at rest, it is one of the two primary types of energy.
Explain that a moving object's mass and speed are two factors that impact the amount of kinetic energy it will possess.

Determine the escape speed for the rocket from the planet-satellite system:

The potential energy of the rocket due to Ganymede when it is on the surface of the Ganymede is,

$U_1=-\frac{G M_{\mathrm{G}} m}{R_G}$

The potential energy of the rocket due to Jupiter

when it is on the surface of the Ganymede is,

$U_2=-\frac{G M_{\mathrm{J}} m}{R}$

Here, R is a separation between Jupiter and Ganymede.

To escape from the surface of Ganymede potential energy of the rocket due to Jupiter and Ganymede is equal to the kinetic energy of the rocket.

$\begin{aligned}&\frac{1}{2} m v^2+U_1+U_2=0 \\&\frac{1}{2} m v^2=-U_1-U_2 \\&\frac{1}{2} m v^2=\frac{G M_{\mathrm{G}} m}{R_G}+\frac{G M_{\mathrm{J}} m}{R} \\&\frac{1}{2} v^2=\frac{G M_{\mathrm{G}}}{R_G}+\frac{G M_{\mathrm{J}}}{R}\end{aligned}$

$v^2=\frac{2 G M_{\mathrm{G}}}{R_G}+\frac{2 G M_{\mathrm{T}}}{R}$

$v=\sqrt{2 G\left(\frac{M_{\mathrm{G}}}{R_G}+\frac{M}{R}\right)}$

$v=\sqrt{2\left(6.67 \times 10^{-11} \mathrm{~N} \cdot \mathrm{m}^2 / \mathrm{kg}^2\right)\left(\frac{1.495 \times 10^{23} \mathrm{~kg}}{2.64 \times 10^6 \mathrm{~m}}+\frac{1.90 \times 10^{27} \mathrm{~kg}}{1.071 \times 10^9 \mathrm{~m}}\right)}$

$v=15.6 \times 10^3 \mathrm{~m} / \mathrm{s}$

$v=15.6 \mathrm{~km} / \mathrm{s}$

To learn more about kinetic energy, refer to:

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3 0

2 years ago

Evidence of a chemical change includes

NNADVOKAT [17]

Answer:1.- b. Change in color.

It's change in color because the other can happen by via a physical change.

2.- d. A metal is added to an acid and hydrogen gas is formed.

A chemical change results in change of an object chemical structure being disrupted or altered.

Explanation:

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4 years ago

What is the potential energy in J of a bungee jumper standing on a 0.109 km bridge that weighs 85 kg?

KatRina [158]

Considering the definition of potential energy, the potential energy of the bungee jumper is 90,889.65 J.

<h3>Potential energy</h3>

Potential energy is the energy that measures the ability of a system to do work based on its position. In other words, this is the energy that a body located at a certain height above the ground has.

Gravitational potential energy is the energy associated with the gravitational force. This will depend on the relative height of an object to some reference point, the mass, and the strength of gravity.

So for an object with mass m, at height h, the expression applied to the gravitational energy of the object is:

Ep= m×g×h

Where:

Ep is the potential energy in joules (J).
m is the mass in kilograms (kg).
h is the height in meters (m).
g is the acceleration of fall in m/s² (approximately 9.81 m/s²).

<h3>Potential energy in this case</h3>

In this case, you know:

m= 85 kg
g= 9.81 m/s²
h= 0.109 km= 109 m (being 1 km= 1000 m)

Replacing in the definition of potential energy:

Ep= 85 kg × 9.81 m/s² × 109 m

Solving:

Finally, the potential energy of the bungee jumper is 90,889.65 J.

Learn more about potential energy:

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4 0

2 years ago

270000 round into 2 significant figures270000 round into 3 significant figures ​

270000 round into 2 significant figures270000 round into 3 significant figures