Multiple choice please help :)

Which of these forces help protons and neutrons to stay at the center of the Atom

Tcecarenko [31]

Strong nuclear force

8 0

3 years ago

Imagine our Solar System is moving in the Milky Way towards a group of two stars. Star A is a Red star that is slightly closer t

Juliette [100K]

Answer:

None of the stars give of light that is red-shifted

Explanation:

Motion of the observer or the source will cause a change in the wavelength of a wave. This is known as the Doppler effect. When an object and observer are getting close, blue shift occurs i.e., the wavelength gets shorter. When an object and observer are getting farther red shift occurs i.e., the wavelength gets longer.

Here, both the stars are getting closer to us so blue shift will occur.

6 0

3 years ago

A radar station sends out a 250000 Hz sound wave at a speed of 340 m/s. The sound wave bounces off a weather ballon and returns

Eddi Din [679]

Answers:

a)The balloon is 68 m away of the radar station

b) The direction of the balloon is towards the radar station

Explanation:

We can solve this problem with the Doppler shift equation:

$f'=\frac{V+V_{o}}{V-V_{s}} f$ (1)

Where:

$f=250,000 Hz$ is the actual frequency of the sound wave

$f'=240,000 Hz$ is the "observed" frequency

$V=340 m/s$ is the velocity of sound

$V_{o}=0 m/s$ is the velocity of the observer, which is stationary

$V_{s}$ is the velocity of the source, which is the balloon

Isolating $V_{s}$ :

$V_{s}=\frac{V(f'-f)}{f'}$ (2)

$V_{s}=\frac{340 m/s(240,000 Hz-250,000 Hz)}{240,000 Hz}$ (3)

$V_{s}=-14.16 m/s$ (4) This is the velocity of the balloon, note the negative sign indicates the direction of motion of the balloon: It is moving towards the radar station.

Now that we have the velocity of the balloon (hence its speed, the positive value) and the time ( $t=4.8 s$ ) given as data, we can find the distance:

$d=V_{s}t$ (5)

$d=(14.16 m/s)(4.8 s)$ (6)

Finally:

$d=68 m$ (8) This is the distance of the balloon from the radar station

6 0

3 years ago

All of the following are processes included in the constructive coping method for stress except _________.

horrorfan [7]

In the analysis of the given options, the most likely answer to this question is "by exposing the client to more stressful situations"These situations can be overwhelming work, and school work, family problems and others.Thank you for your question. Please don't hesitate to ask in Brainly your queries.

7 0

3 years ago

Read 2 more answers

A golf ball has a mass of 120g. Calculate its increase in mass when it is travelling at 40ms1. What is this as a percentage of i

kicyunya [14]

Answer:

$Percentage=8.889\times 10^{-13}$ %