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3 years ago

9

If the gravitational force exists between all objects in the universe, why aren’t people affected by the gravitational force exe

rted by cars and buildings?

1 answer:

soldier1979 [14.2K]3 years ago

6 0

Because cars and buildings are small in mass and so exert very low gravitational fore which is dominated by the large gravitational force of earth

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HELP!! WILL MARK BRAINLIEST!!!!!

krek1111 [17]

Answer:

Create

Broken

Explanation:

Bond formation or creation requires the use of energy. Energy is used during bond formation between chemical species. The energy is required for the reaction to occur.

When bonds are broken, energy is released
Bond breaking process is a procedure that releases energy.
This energy makes them able to react.

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3 years ago

A 10-kg rock falls from a height of 8-m above the ground. What is the kinetic energy of the rock just before it hits the ground?

pishuonlain [190]

Answer: 800

Explanation:

1/2 x m x v^2 = m x g x h

KE = 10 x 10 x 8

KE= 800

3 0

3 years ago

A cruise ship with a mass of 1.03 ✕ 107 kg strikes a pier at a speed of 0.652 m/s. It comes to rest after traveling 4.44 m, dama

Gnoma [55]

Answer:

The average force exerted on the pier is $4.9 \times 10^{5}$ N

Explanation:

Given :

Mass of ship $m = 1.03 \times 10^{7}$ Kg

Distance $x = 4.44$ m

Velocity $v = 0.652$ $\frac{m}{s}$

Now find the average velocity,

$v _{avg} = \frac{0+0.652}{2}$

$v _{avg} = 0.326$ $\frac{m}{s}$

Now find the time taken by ship to travel 4.44 m.

$t = \frac{x}{v_{avg} }$

$t = \frac{4.44}{0.326}$

$t = 13.62$ sec

Now calculating average force,

$F = \frac{m \Delta v}{\Delta t}$

Where $\Delta v = 0.652 -0$ = 0.652 $\frac{m}{s}$

$F = \frac{1.03 \times 10^{7} \times 0.652 }{13.62}$

$F = 4.9 \times 10^{5}$ N

Therefore, the average force exerted on the pier is $4.9 \times 10^{5}$ N

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3 years ago

What two quantities are always conserved in a nuclear reaction equation?

kupik [55]

Answer:B

Explanation:

Option A:

In the nuclear reactions,neutron can be split into proton an electron.

In this case,the number of protons are increasing,increasing the atomic number.

Hence,the atomic number is not conserved.

Option B:

In any reaction the sum of number of neutrons and number of protons remain constant before and after the reaction.

Option C:

The mass number may change for the atoms.For example $\alpha$ emission reduces the atomic number by $2.$

Option D:

In the nuclear reactions,neutron can be split into proton an electron.

So,they number of neutrons may change.

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3 years ago

2. A 0.2-kg rock is tied to a string and is whirled around in a

snow_tiger [21]

B is the correct answer

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2 years ago