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3 years ago

The atomic number of an element is determined by the number of A. electrons. B. protons. C. protons and neutrons. D. neutrons.

Physics

1 answer:

sergiy2304 [10]3 years ago

7 0

Answer: C

Explanation: The atomic number of an element is determined by the number of protons because the number of protons in the nucleus of an atom is equal to the number of atoms.

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The brakes exert a 1,951 N force on a car weighing 18,985 N and moving at 12 m/s. The car finally stops. How long (in seconds) d

nata0808 [166]

Answer:20,000

Explanation:

7 0

3 years ago

Someone help me haha;(

Nikitich [7]

Answer: vf = 51 m/s

d = 112 m

Explanation: Solution attached:

To find vf we use acceleration equation:

a = vf - vi / t

Derive to find vf

vf = at + vi

Substitute the values

vf = 3.5 m/s² ( 8.0 s) + 23 m/s

= 51 m/s

To solve for distance we use

d = (∆v)² / 2a

= (51 m/s - 23 m/s )² / 2 ( 3.5 m/s²)

= (28 m/s)² / 7 m/s²

= 784 m/s / 7 m/s²

= 112 m

6 0

3 years ago

Why is the answer A and not C?<br>please help!

MariettaO [177]

Answer:

because it gives a complete thought

4 0

2 years ago

A 70.-kilogram cyclist develops 210 watts of

Temka [501]

The Definition of Potence is given by:

$P=Fv$

Entering the unknowns:

$P=Fv \\ 210=7F \\ F= \frac{210}{7} \\ \boxed {F=30N}$

Number 2

If you notice any mistake in my english, please let me know, because i am not native.

8 0

4 years ago

A cat is chasing a bird across your yard. It covers 14.6 m in 2.8 s. What is its average velocity?

ololo11 [35]

Answer:

Explanation:

The average velocity of the cat can be found by using the formula

$v = \frac{d}{t} \\$

d is the distance

t is the time taken

From the question we have

$v = \frac{14.6}{2.8} \\ = 5.2142857..$

We have the final answer as

Hope this helps you

5 0

3 years ago