# Josh

### I need help with math question?

Consider line L, given below.

x = 8 + t, y = 2 + t, z = 7 + 2t, t is in ℝ

Find the distance from the origin to line L.

I'm trying to calculate it right but I keep getting a decimal under the square root

(9+t)1+(2+t)1+95+5t)5

9+t+2+t+25+25t

36+27t

divide -36 by 27 and then plug that number back unto the top equation. for each equations final result I squared the numbers and added it then squared it to get a weird decimal that isn't the answer

Mathematicshace 1 semana### need help with math problem?

Consider line L, given below.

x = 8 + t, y = 2 + t, z = 7 + 2t, t is in ℝ

Find the distance from the origin to line L.

I'm trying to calculate it right but I keep getting a huge answer in the thousands under the square root

3 respuestasMathematicshace 1 semana### How do I solve this math question?

Consider line L, given below.

x = 8 + t, y = 2 + t, z = 7 + 2t, t is in ℝ

Find the distance from the origin to line L.

the answer is square root 21 but I don't understand how to get to this answer. Please show in detail how to do this. Thank you

4 respuestasMathematicshace 2 semanas### I need help with this physics problem ?

Astronauts on Earth observe a feature at 1.14x10^3 nm in the spectrum of a distant quasar. It is known that the feature corresponds to 595 nm in the rest frame of the quasar. Calculate the quasar’s speed.

1 respuestaAstronomy & Spacehace 2 semanas### Need help with old physics questions?

4a.show the correct relativistic doppler formula for light and show the second relativistic doppler formula for light as well in steps all by using taylor series

4b.An object shining light with a wavelength of lambada is moving away from you with a relative speed of u, which is tiny compared to the speed of light. Write the algebraic expression for the difference in wavelength between what you observe and what the object shines, to first order in u. Express the answer in terms of the original wavelength and the relative speed.

5.A light strikes a plane mirror at a 50° angle of incidence. The mirror is then turned by θ = 19°, while the incident ray is kept fixed: Through what angle does the reflected ray rotate? and Through what angle does the reflected ray turn if the initial angle of incidence is instead 60°?

Physicshace 2 semanas### Needing help with old physics questions?

1. A space probe is currently 4.70 billion miles away from Earth. How many hours does it take for radio signals to get to the space probe?

2.Astronauts observe a feature at 1.19×103 nm in the spectrum of a distant quasar. However, it is known that this feature corresponds to 590 nm in the rest frame of the quasar. Calculate the speed of the quasar. Enter your answer as a fraction of the speed of light

3.Galileo attempted to measure the speed of light by measuring the time elapsed between his opening a lantern and his seeing the light return from his assistant's lantern.

-Suppose that Galileo and his assistant both have reaction times of 0.190 s. If the distance between them is d = 2.90 km, what do they measure for the speed of light?

-Assume the same reaction times as before, and calculate the minimum distance d between Galileo and his assistant, so that their measured value for the speed of light is off by no more than 18.0 percent from the actual value.

Physicshace 2 semanas### Needing help with these old physics questions?

The displacement x of a simple harmonic motion is given by X = 24cos(6.28t) meters what is the angular speed of the oscillator?

12rad/s

6.28rad/s

6rad/s

2rad/s

A bullet moves horizontally with velocity v hitting a stationary wooden block and embeds itself in the block. The masses of the bullet and block are 25g and 2g. If the speed of the system after colliding is 2.4m/s find the velocity of the bullet.

-192.0m/s

-194.4m/s

-216.0m/s

-184.2m/s

Two small spheres of mass 3kg and 5kg are connected by a 4m long light rod. Find the distance to the center of mass of the system from the 3kg sphere

-2m

-3m

-2.5m

-1.5m

1 respuestaPhysicshace 2 meses### Needing help with this physics question I got wrong?

At a distance of 12m from a sound source the sound intensity is found to be 0.1W/m^2. What is the sound intensity at a distance 36m from the source?

A. 0.011 W/m^2

B. 0.1 W/m^2

C. 0.3 W/m^2

D. 0.033 W/m^2

After making the assumption to calculate and use the same density I got for 12m, I was apparently wrong to do so, so I found that the answer is not D. I am stumped on what it could be.

1 respuestaPhysicshace 2 meses### Needing help with this physics questions?

Two sound waves W1 and W2 of the same wavelength interfere destructively at point P. The waves originate from two in phase speakers. W1 travels 36m and W2 travels 24m before reaching point P. Which of the following values could be the wave length of the sound waves?

6m

4m

24m

12m

1 respuestaPhysicshace 2 meses### needing help with these old physics questions ?

1. A man standing at a railway crossing notices that the frequency of a horn of an incoming train increases when the train is coming towards him. The actual frequency of the horn doesn't change

A.The train must be traveling at constant speed

B.The speed of the train must be increasing as it approaches the man

C.The speed of the train must be decreasing as it approaches the man

2. A driver of a stationary car hears a siren of an approaching ambulance at a frequency of 280Hz. If the actual frequency of the siren is 240Hz, find the speed of the ambulance. Note that the speed of sound is 343m/s.

A.28 m/s

B.36m/s

C.49m/s

D.57m/s

2 respuestasPhysicshace 2 meses### please help with these old physics questions?

The wave number and the angular frequency are 6.2rad/m and 12 rad/s. what could be the equations of the wave?

8sin(6.2x-12t)

8sin(12x-6.2t)

12sin(6.2x-8t)

all of the above

Find the displacement of the wave y= 12sin(6.28x-3.14t) when x=2m and t=4s

0m

6m

12m

3m

1 respuestaPhysicshace 2 meses### which of the following is an example for a simple harmonic motion?

This is a past physics homework question I got wrong and I still don't understand what the answer is. The question states "which of the following is an example for a simple harmonic motion?"

A. a pendulum oscillating through a 45 degree angle

B. a ball thrown straight upward

C. A rod pivoted at the upper end freely oscillating back and forth through a 5 degree angle

D. a football kicked at a 45 degree angle from the horizontal

It is not A, that is what I chose for the answer and I got it wrong. I don't understand what the answer would be. Please explain the correct answer and why it is the correct answer. Thank you.

4 respuestasPhysicshace 2 meses### I need help solving this physics question?

Here is a picture of the question with the figure to help. I’m completely stumped on what to do when I’ve tried so many times but can’t seem to friend the right answer. Please help.

4 respuestasPhysicshace 3 meses### Please help with this physics problem?

A light, rigid rod of length ℓ = 1.00 m

joins two particles, with masses m1 = 4.00 kg

and m2 = 3.00 kg, at its ends. The combination rotates in the xy-plane about a pivot through the center of the rod. the speed of each particle is 8.00 m/s. What would be the new angular momentum of the system (in kg · m2/s) if each of the masses were instead a solid sphere 13.5 cm in diameter?

2 respuestasPhysicshace 3 meses### I feel like this month has been the worst for my boyfriend and I and has torn us a little, what do I do for this to change?

My bf and I are juniors in college and we have been dating for 8 months. This month has been really awful. For V day my bf took me to a movie with his friends that were coupled up and one single friend of his brought a handful of single people. I didn't mind that there were other people there cause I was just happy that I was sitting next to my bf spending time with him. The movie was cool. Afterwards, we decided to play video games in the game room at one of the dorms, also cool to me. What started turning the night around was when the single people brought a lot of alcohol in and said,"lets get drunk and have sex!"I am 2 months away from turning 21 while everyone else except the person who shouted was 21 yet the underage person was going to drink anyways, not my problem, but I get uncomfortable around drunk people because of my past with my dad always and still being an alcoholic and always being drunk. I was getting hungry cause we haven't had dinner or food in 9 hours, I just fell asleep to try to ignore everyone shouting “shut up!"I became upset when my bf told everyone to stop talking because he has a headache from not being allowed to have coffee for days(he wasn't drunk), one of my presents to him was coffee :( and I wasn't even talking the whole time so its like I didn't exist. I eventually left the party because I was sad and my friend asked if I wanted to leave and go get food. My bf asked where I was going and if I was ok.

2 respuestasSingles & Datinghace 7 meses