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3 years ago

Are the properties of rubidium more like those of cesium or those of strontium ? Explain your ans

Physics

1 answer:

Citrus2011 [14]3 years ago

7 0

Answer:

Cesium.

Explanation:

For non-transition elements such as rubidium, cesium, and strontium, the most chemically similar element to any other element is always one in the same column of the periodic table but in an adjacent row. Since strontium is not in the same column as rubidium but cesium is in the same column and an adjacent row, the answer follows. (This rule is sometimes true also for transition elements, but not always: For example, for elements in columns 8, 9, and 10, the most nearly chemically similar element is one in the same row and an adjacent column within this group, rather than one in the same column but an adjacent row.)

Hope This Helps!

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~DuffyDuck~

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A force of 50 N is used to move a footstool 3 m. How much work is done?

vaieri [72.5K]

The work done is 150 joules

Explanation:

Work occurs when a force (F) acts on an object to move it some

distance (d) from the start point

→ Work done = F × d

The S.I unit of work is Joule

A force of 50 N is used to move a footstool 3 m

→ F = 50 N

→ d = 3 m

→ Work done = F × d

Substitute the values of F and d in the rule

→ Work done = 50 × 3 = 150 joules

The work done is 150 joules

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You can learn more bout work done in brainly.com/question/9100769

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3 years ago

Identical cannonballs are fired with the same force, one each from four cannons having respective bore lengths of 1.0 meter, 2.0

frez [133]

OK think of it distance,The smaller the distance less momentum is needed the Longer the distance the the longer the momentum is needed.

And The Answer Is quite easy their was no reason to be asked

Answer:1.0meter

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3 years ago

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Density is calculated by dividing the ________ by the _________.

Katen [24]

Mass of the object by its volume

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3 years ago

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A star with the mass (M=2.0×1030kg) and size (R=3.5×108m) of our sun rotates once every 30.0 days. After undergoing gravitationa

Gre4nikov [31]

Answer:

$r=97.22x10^{3} m$

Explanation:

Using the angular formulas can determine the radius using both values neutron star and the the knowing star so

$L=I*w$

$L_{1}=I_{1}*w_{1}=L_{2}=I_{2}*w_{2}$

$I_{1}*w_{1}=I_{2}*w_{2}$

I=Inertia of the star

w=angular velocity

$I=\frac{2*m*r^{2}}{5}$

$w=\frac{2\pi}{t}$

Notice the angular velocity determinate by the time and the Inertia have the radius value so

$\frac{2}{5}*m*r_{sn}^{2}*\frac{2\pi }{t_{1}}=\frac{2}{5}*m*r_{s}^{2}*\frac{2\pi }{t_{2}}$

$r_{sn}^{2}*\frac{1}{t_{1}}=r_{s}^{2}*\frac{1}{t_{2}}$

$r_{sn}^{2}=r_{s}^{2}*\frac{t_{1}}{t_{2}}$

$t_{1}=0.2s\\t_{2}=30day*\frac{24hr}{1day}*\frac{60minute}{1hr}*\frac{60seg}{1minute}=2.592x10^{6}s$

$r_{sn}=3.5x10^{8}m*\sqrt{\frac{0.2s}{2.592x^{6}s}}$

$r_{sn}=97.22x10^{3} m$

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3 years ago

A woman sits on a spinning piano stool with her arms extended. When she folds her arms, which of the following occurs? Question

iogann1982 [59]

Answer:

The correct option is that (She decreases her moment of inertia, thereby increasing her angular speed.)

Explanation:

When an object is in circular motion, the vector that describes it is known as angular momentum. Angular momentum is conserved or constant when an object is spinning in a closed system and no external torques are applied to it. An example of conservation of angular momentum is seen when a woman is sitting on a spinning piano stool with her arms extended. Her angular momentum is conserved because the net torque on her is negligibly small as the friction is exerted very close to the pivot point.

When she folds her arms,her rate of spin increases greatly decreasing her moment of inertia. The work she does to pull in her arms results in an increase in rotational kinetic energy( that is, increase in her angular speed). I hope this helps, thanks!

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3 years ago