Log in
Physics
1
answer
0
watching
78
views
27 Nov 2019

I need more help with question.

A light beam moves along the y' axis with speed c in frame S',which is moving to the right with speed v relative to frame S. a)Find Ux and Uy, the x and y components of the velocity of the lightbeam in frame S. b) Show that the magnitude of the velocity of thelight beam is S in c.

I was just hoping to see this worked out in more detail that isprovided on the site. I'm a little confused with the explanationgiven

Watch
1
answer
0
watching
78
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Beverley Smith
Beverley SmithLv2
23 Sep 2019

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

An observer in frame S standing at the origin observestwo flashes of colored light separated spacially by Δx = 1700 m. A blue flash occurs first, followedby a red flash 8 µs later. Anobserver in S ' moving along the x axis at speedv relative to S also observes the flashes8 µs apart and with aseparation of 1700 m, but thered flash is observed first. Find the magnitude and direction ofv.
1m/s

2
-xdirection +ydirection -y direction +xdirection

In the latest Indian Jones film, Indy is supposed to throw agrenade from his car, which is going 95.0 , to his enemy's car,which is going 125 . The enemy's car is 13.0 in front of the Indy'swhen he lets go of the grenade.

If Indy throws the grenade so its initial velocity relative to himis at an angle of 45 above the horizontal, what should themagnitude of the initial velocity be? The cars are both travelingin the same direction on a level road. You can ignore airresistance.

Hint: The grenade moves in projectile motion, and convert the twovelocities given in the problem from km/hr to m/s. Being anexcellent student of P2, Indy knows that horizontal range of thegrenade must equal the distance that the enemies car is ahead atthe time the grenade is thrown plus the distance the enemies cartravels while the grenade is in the air. This distance is given byv_rel*t, where v_rel the relative velocity of the enemies carrelative to the Indy's and t is the time in the air.

Solve for time that the grenade is in the air in terms ofv_0.

Use the range equation to get the grenade distance as a function ofv_0

Set R=(initial separation)+v_rel*t and get a 2nd order polynomialfor v_0. Use quadratic equation to get v_0. This is the magnitudeof the velocity vector relative to Indy.

and...
Find the magnitude of the velocity relative to the earth.

Hint: Use Galileo's equation where Frame A is ground, Frame B isIndy's car and the object of interest P is the granade.

Use your answer in part A for speed and given direction tocalculate the x and y components of the velocity with respect toIndy's car. The velocity of Indy's car with respect to the groundis straightforward to write in x and y components.

In the latest Indian Jones film, Indy is supposed to throw agrenade from his car, which is going 82.0 km/h, to his enemy's car,which is going 125km/h. The enemy's car is 14.6m in front of theIndy's when he lets go of the grenade.



=====>Part A: What is the Vo ? in km/h

If Indy throws the grenade so its initial velocity relative to himis at an angle of 45 ^\circ above the horizontal, what should themagnitude of the initial velocity be? The cars are both travelingin the same direction on a level road. You can ignore airresistance.

Hint: The grenade moves in projectile motion, and convert the twovelocities given in the problem from km/hr to m/s. Being anexcellent student of P2, Indy knows that horizontal range of thegrenade must equal the distance that the enemies car is ahead atthe time the grenade is thrown plus the distance the enemies cartravels while the grenade is in the air. This distance is given byv_rel*t, where v_rel the relative velocity of the enemies carrelative to the Indy's and t is the time in the air.

Solve for time that the grenade is in the air in terms ofv_0.

Use the range equation to get the grenade distance as a function ofv_0

Set R=(initial separation)+v_rel*t and get a 2nd order polynomialfor v_0. Use quadratic equation to get v_0. This is the magnitudeof the velocity vector relative to Indy.



=====>Part B: What is Vo in km/h?

Find the magnitude of the velocity relative to the earth.

Hint: Use Galileo's equation where Frame A is ground, Frame B isIndy's car and the object of interest P is the granade.

Use your answer in part A for speed and given direction tocalculate the x and y components of the velocity with respect toIndy's car. The velocity of Indy's car with respect to the groundis straightforward to write in x and y components.


Weekly leaderboard

Home
Homework Help 3,900,000
Physics 110,000
Start filling in the gaps now
Log in