All categories

3 years ago

(This is for science, not physics.)

Physics

2 answers:

Anuta_ua [19.1K]3 years ago

6 0

The answer would be B, 19 protons. Hope this helps!

Inessa [10]3 years ago

6 0

The average mass of potassium is 39 amu and 19 electrons. 19 electrons mean there have to be 19 protons. 39-19=20. Therefore potassium has 20 neutrons. The answer is C, 20.

You might be interested in

What are the components of a vector with a magnitude of 4.00 and a direction of -112°?

zzz [600]

Answer: (-1.50 -3.71)

Explanation:

4 0

3 years ago

Plants use sunlight to fuel photosynthesis (the process they use to produce their food). Which of the following is the best desc

Montano1993 [528]

I think it’s “light energy to chemical energy” let me know if i’m wrong

6 0

3 years ago

To practice Problem-Solving Strategy 15.1 Mechanical Waves. Waves on a string are described by the following general equation y(

NeX [460]

Answer:

The transverse displacement is $y(1.51 , 0.150) = 0.055 m$

Explanation:

From the question we are told that

The generally equation for the mechanical wave is

$y(x,t) = Acos (kx -wt)$

The speed of the transverse wave is $v = 8.25 \ m/s$

The amplitude of the transverse wave is $A = 5.50 *10^{-2} m$

The wavelength of the transverse wave is $\lambda = 0540 m$

At t= 0.150s , x = 1.51 m

The angular frequency of the wave is mathematically represented as

$w = vk$

Substituting values

$w = 8.25 * 11.64$

$w = 96.03 \ rad/s$

The propagation constant k is mathematically represented as

$k = \frac{2 \pi}{\lambda}$

Substituting values

$k = \frac{2 * 3.142}{0. 540}$

$k =11.64 m^{-1}$

Substituting values into the equation for mechanical waves

$y(1.51 , 0.150) = (5.50*10^{-2} ) cos ((11.64 * 1.151 ) - (96.03 * 0.150))$

$y(1.51 , 0.150) = 0.055 m$

4 0

4 years ago

Explain which culture’s values more closely match your own, and why.Briefly explain why experiments having faulty design or inco

Helen [10]

Answer:

The two main reasons that your results might not match up each time are uncontrolled conditions and experimental error.

5 0

3 years ago

Please help! Giving 20 points!!

MrMuchimi

Answer:

Explanation:

Remark

This is a momentum question. Both cars are sitting still (v1 and v2 are both 0) to start with). When the spring is sprung), they both move but in opposite directions.

Let us say that v4 is minus.

Equation

0 = m3*v3 - m4* v4

Givens

m3 = 1750 kg

m4 = 1000 kg

v3 = 4 m/s

Solution

m3*4m/s - m4*x = 0

1750 * 4 - 1000*x = 0

1750 * 4 = 1000x

7000 = 1000 x

7000/1000 = x

x = 7 m/s

7 0

3 years ago