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4 years ago

An element’s atomic number is 35. how many portions would an atom this element have

Physics

1 answer:

kotykmax [81]4 years ago

4 0

35 protons are present in an element whose atomic number is 35.

Explanation:

In an atom of an element, the number of protons = atomic number

Number of protons = number of electrons

Mass Number = number of protons + number of neutrons

Hence, an atom with atomic number 35 will have 35 protons.

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A rock is dropped from a vertical cliff. The rock takes 3.00 s to reach the ground below the cliff. A second rock is thrown vert

Phantasy [73]

Answer:

Velocity v= 12.25 $\frac{m}{s}$

Explanation:

The first rock dropped give the distance Y in meters

$Y_{f}=Y_{o}+v_{o}*t +\frac{1}{2}*a*t^{2}\\ Y_{f}=\frac{1}{2}* 9.8 \frac{m}{s^{2} }* 3^{2} \\Y_{f}=44.1 m$

Now the motion of the second rock the time change so to know the velocity

$Y_{f}= Y_{o} +v_{o}*t +\frac{1}{2}*a *t^{2} \\v_{o}*t= -Y_{f} +\frac{1}{2} *a*t^{2} \\v_{o} =\frac{-44.1 +0.5 * 9.8* s^{2} }{2} \\v_{o}= 12.25 \frac{m}{s}$

7 0

3 years ago

Define the term sorting

Nikolay [14]

Answer: arrange systematically in groups; separate according to type, class, etc.

Explanation:

i hooked this up btw

6 0

3 years ago

At the same moment, one rock is thrown upward at 4.5 m/s and another thrown downward at 6.2 m/s. What is the relative velocity o

erastova [34]

The correct answer is
C) -10.7 m/s

In fact, the first rock is moving upward with velocity +4.5 m/s, while the second rock is moving downward with velocity -6.2 m/s, with respect to a fixed reference frame. In the reference frame of the first rock, instead, the second rock is moving with velocity equal to its velocity in the fixed frame minus the velocity of the reference frame of the first rock:
 $v=-6.2 m/s -(+4.5 m/s) = -10.7 m/s$

8 0

4 years ago

What force is needed to give a 4800.0 kg truck an acceleration of 6.2 m/s2 over a level road?

tekilochka [14]

Answer:

the force needed to give the truck the acceleration is 29,760 N.

Explanation:

Given;

mass of truck, m = 4800 kg

acceleration of the truck, a = 6.2 m/s²

The force needed to give the truck the acceleration is calculated as;

F = ma

F = 4800 x 6.2

F = 29,760 N

Therefore, the force needed to give the truck the acceleration is 29,760 N.

6 0

3 years ago

Consider the image above and select the answer that best represents the skiers energy.

Masteriza [31]

Answer:

I need an image, but if you're talking about Potential and Kinetic energy, I will determine for you:

Explanation:

Potential Energy: stored energy that depends upon the relative position of various parts of a system.

Kinetic Energy: the form of energy that an object or a particle has by reason of its motion.

Therefore, if the skier is on top of the mountain, they would have potential energy since their energy from the ground to the top of the surface is stored. But, if the skier is in motion/mid-air from the top of a mountain, their energy is kinetic (in motion) because their stored energy (potential) is released as they step off of the surface.

7 0

3 years ago