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  • physics question - work and energy?


    I've been stuck on this question and was wondering how I would do this:

    A ball of mass 0.149 kg is dropped from a height 2.23 m above the ground.

    acceleration due to gravity is 9.8^2

    Neglecting air resistance, determine the speed of the ball when it is at a height 0.851 m above the ground.

    Answer in units of m/s.

    1 AnswerPhysics4 months ago
  • Utexas problem for Lights and Waves?

    Find the angle of refraction for a ray of light that enters a bucket of water (n = 1.333) from air at an angle of 11.1◦ to the normal.

    Answer in units of ◦.

    i keep getting this one wrong... I tried looking at my teachers guide but I get confused when he brings in Sin

    3 AnswersPhysics5 months ago
  • Phyics question - Light / waves?

    hey guys, I have a utexas problem thats stumping me. Its: 

    The index of refraction of crown glass for red light is 1.512, while for blue light it is 1.532. White light is incident on the glass at 25.5◦.Find the angle of refraction for red light. Answer in units of ◦.


    Find the angle of refraction for blue light. Answer in units of ◦.

    I don't know what im doing wrong and I have 2 more attempts... thanks :)

    1 AnswerPhysics5 months ago
  • motion problem phyiscs ?

    hello :)

    I have a Phyics problem that im having some rouble with, its a 2 part question basically.. 

    A plane is flying horizontally with speed

    235 m/s at a height 6040 m above the ground,

    when a package is dropped from the plane.

    The acceleration of gravity is 9.8 m/s 


    Neglecting air resistance, when the package hits the ground, the plane will be

    A second package is thrown downward from the plane with a vertical speed v1 = 51 m/s.

    What is the magnitude of the total velocity of the package at the moment it is thrown as seen by an observer on the ground?

    Answer in units of m/s.

    What horizontal distance is traveled by this package?

    Answer in units of m.

    I know that we have todo distance and some sin, cos, tan but I don't know which one.. thanks for any help :)

    2 AnswersPhysics7 months ago
  • physics problem, newtons law?

    hey folks, im at my last try for uTexas on this and I was wondering if someone can help me with it.. 

    A 22 kg chair initially at rest on a horizontal floor requires a 174 N horizontal force to set it in motion. Once the chair is in motion, a 141 N horizontal force keeps it moving at a constant velocity. The acceleration of gravity is 9.81 m/s .


    a) What is the coefficient of static friction between the chair and the floor?

    011 (part 2 of 2) 10.0 points

    b) What is the coefficient of kinetic friction between the chair and the floor?

    thanks to anyone that helps!


    2 AnswersPhysics8 months ago
  • physics problem -elastic  ?

    I have a Utexas problem that's stomping me. I keep getting the wrong answers and I have 3 more entires lul

    A(n) 3.62 kg sphere makes a perfectly in- elastic collision with a second sphere that is initially at rest. The composite system moves with a speed equal to one-third the original speed of the 3.62 kg sphere.

    What is the mass of the second sphere? Answer in units of kg.

    ill appreciate any help given :) 

    3 AnswersPhysics9 months ago
  • physics promblem?

    yes this is Texas, but I'm having trouble understanding ow to do this one:

    A revolutionary war cannon, with a mass of 2260 kg, fires a 24.8 kg ball horizontally. The cannonball has a speed of 149 m/s after it has left the barrel. The cannon carriage is on a flat platform and is free to roll horizontally.What is the speed of the cannon immedi- ately after it was fired?Answer in units of m/s.I appreciate any help I can get!

    3 AnswersPhysics9 months ago
  • physics questions?

    how would i solve this...

    A knight sits on a castle wall during a siege.

    To while away the time, he notes that boulders catapulted from below land on the top of

    his wall with a vertical velocity of 5.3 m/s.

    If he is 40 m above the catapult, what

    is the initial velocity of the boulders? The

    acceleration of gravity is 9.8 m/s



    Answer in units of m/s.

    3 AnswersPhysics10 months ago