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3 years ago

What does the term atomic number mean?

2 answers:

8 0

In chemistry and physics, the atomic number of a chemical element also known as a proton number the proton number is the number of protons

Katyanochek1 [597]3 years ago

6 0

# of protons found in the nucleus of an atom of that element,and, therefore identical to the charged nucleus.

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why do a circulatory system is important in meeting the needs of all cells throughout an animals body

valentinak56 [21]

The circulatory system is important in meeting the needs of all cells in the body because it offers means of transport by which cells obtain the materials needed to live and function. The functions of the circulatory system by which the cells are supported include: 1. Respiration- oxygen is delivered to the cells and carbon dioxide is removed from them. 2. Nutrition- nutrients for energy are supplied to every cell in the body. 3. Waste removal- metabolic waste products are taken away before they accumulate and become harmful to the cells. 4. Cellular communication- hormones are transported to the cells and organs that need them for proper functioning. 5.Thermoregulation- As blood circulates, it keeps body temperature balanced and thus cells are able to carry out processes well.

3 0

4 years ago

A particular motor can provide a maximum torque of 110 n • m. assuming that all of this torque is used to accelerate a solid, un

hjlf

Using the rotational equivalent of force:

Which is T = I*Alpha

Where: T is torque, I is the moment of inertia and Alpha is the angular acceleration.

This is for the flywheel: J = 1/2mr^2 = 5*3^2 = 45 kgm^2

From the equation:

T = J*dω/dt

we get:

Δt = J*Δω/T = 45*8.13/110.0 = 3.326 sec

5 0

4 years ago

Question 4 of 10

uysha [10]

Answer:

Determining how data will be gathered

Explanation:

As a scientist considers the use of a particular set of experimental procedures to carry out his research, an important consideration is the method of data collection.

The experimental procedures chosen must be those that make the process of data collection much easier, efficient and lead to collection of reliable data.

Hence determining the method of data collection is very important when designing a set of experimental procedures.

8 0

3 years ago

Beings on spherical asteroid have observed that a large rock is approaching their asteroid in a collision course. At 7514 km fro

luda_lava [24]

Answer:

c. $4.582\times10^{21} kg$

Explanation:

$r_{i}$ = Initial distance between asteroid and rock = 7514 km = 7514000 m

$r_{f}$ = Final distance between asteroid and rock = 2823 km = 2823000 m

$v_{i}$ = Initial speed of rock = 136 ms⁻¹

$v_{f}$ = Final speed of rock = 392 ms⁻¹

$m$ = mass of the rock

$M$ = mass of the asteroid

Using conservation of energy

Initial Kinetic energy of rock + Initial gravitational potential energy = Final Kinetic energy of rock + Final gravitational potential energy

$(0.5) m v_{i}^{2} - \frac{GMm}{r_{i}} = (0.5) m v_{f}^{2} - \frac{GMm}{r_{f}} \\(0.5) v_{i}^{2} - \frac{GM}{r_{i}} = (0.5) v_{f}^{2} - \frac{GM}{r_{f}} \\(0.5) (136)^{2} - \frac{(6.67\times10^{-11}) M}{(7514000)} = (0.5) (392)^{2} - \frac{(6.67\times10^{-11}) M}{(2823000)} \\M = 4.582\times10^{21} kg$

8 0

4 years ago

PLEASE HELP QUICK!! A parachute works by increasing the amount of time it takes to bring your

Irina-Kira [14]

Answer:

D) decreses the force .... so the guy can land safely :)

Explanation:

6 0

3 years ago