PHYSICS MIDDLE SCHOOL

What determines the chemical properties of an element? A. the number and arrangement of the electrons in an atom B. the number of neutrons and protons in an element C. the arrangement of all the neutrons, protons, and electrons D. the atomic mass of an atom

Answers

Answer 1

Answer: The sum of the protons and neutrons in an atom equals the mass number.

Answer 2

Answer:

the answer would be A. the number and arrangement of the electrons in an atom

ik bc i took the test

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Bart ran 5000 meters from the cops and had an average speed of 6 meters/second before he got caught. How long did he run?

Answers

Answer:

833.3 seconds

Explanation:

(t) 6 m/s = 5000/ t

6t/6 = 5000/6

t = 833.3 sec.

A white blood cell that destroys pathogens by engulfing them and breaking them down is called please helpA Antigen

B B-cell

C Antibody

D Phagocyte

Answers

Answer: D

Explanation: Its a type of white blood cell that moves by amoeboid

The answer is D. Phagocyte

You travel 25 meters east and then travel 48 meters south. What is your total displacement

Answers

Answer:

54.1 m at $-62.5^(\circ)$ (south of east)

Explanation:

Displacement is a vector connecting the initial position with the final position of motion.

In this problem, the motion consists of two parts:

- A first movement 25 m east

- A second movement 48 m south

We can therefore write a vector representing the displacement as

$d=(25i-48j)$

where i is the unit vector indicating the east direction and j the unit vector indicating the north direction.

Therefore, the total displacement is just the magnitude of this vector:

$d=√(25^2+(-48)^2)=54.1 m$

And the direction is given by

$\theta=tan^(-1)((d_y)/(d_x))=tan^(-1) ((-48)/(25))=-62.5^(\circ)$

A block of lead has dimensions of 4.50cm by 5.20cm by 6.00cm. The block weighs 1587g. From this information, calculate the density of the lead.

Answers

Density = Mass / Volume
Volume = Area x Length = (4.50 x 5.20) x 6.00 = 140.4
Density = 1587 x 140.4 = 222,814.8 g/cm3 (cubed)
222,814.8 / 1000 = 222.8148 kg/m3 (cubed)

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