3 years ago

When scientists look at these examples, what do they know about the atoms?

Physics

2 answers:

Naya [18.7K]3 years ago

7 0

C. Because protons are the identity of the atom.

kap26 [50]3 years ago

5 0

The number of neutrons in each is not the same. isotopes are atoms of the same element that have different numbers of protons.

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the object is in _________ when the vector sum of the force is acting on the object is equal to zero

Norma-Jean [14]

Answer:

Equilibrium

Explanation:

An object is in equilibrium when the vector sum of the force acting on the object is equal to zero.

A body in equilibrium is at state of rest of rest or in motion with no external force acting on it.

The resultant of all forces acting on the body is zero.
In this case there is no net force and the body will be at rest.

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3 years ago

2) How much work is required to pull a sled 15 meters if you use 30N of force?

geniusboy [140]

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Explanation:

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2 years ago

A ball is projected horizontally from the top of a bertical building 25.0m above the ground level with an initial velocity of 8.

kirill115 [55]

Answer:

Solution given:

height [H]=25m

initial velocity [u]=8.25m/s

g=9.8m/s

now;

a. How long is the ball in flight before striking the ground?

Time of flight =?

Now

Time of flight= $\sqrt{\frac{2H}{g}}$

substituting value

= $\sqrt{\frac{2*25}{9.8}}$
=2.26seconds

<h3>the ball is in flight before striking the ground for 2.26seconds.</h3>

b. How far from the building does the ball strike the ground?

Horizontal range=?

we have

Horizontal range=u* $\sqrt{\frac{2H}{g}}$

=8.25*2.26
=18.63m

<h3>The ball strikes 18.63m far from building. </h3>

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2 years ago

a watermelon is balanced by a dog, a pumpkin, a flowerpot, and a baseball as shown below. Is the weight of the watermelon equal

alukav5142 [94]

Answer:

pumpkin

Explanation:

watermelon and pumpkins are close to shape and size

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3 years ago

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Consider an ideal spring, with spring constant k, which is oriented along an x-axis. one end of the spring is fixed, and the fre

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The spring is neither stretched nor compressed. an object having a mass m is attached to the free end of the spring. consider an action

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