Lv 1123 points

# james

Questions4

I like to code in swift

• ### physics question - work and energy?

Hello!

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.

• ### 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.

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

• ### 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 ◦.

and

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 :)

• ### 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

2

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?

What horizontal distance is traveled by this package?

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

• ### 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 .

2

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!

-James

• ### 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 :)

• ### 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!

• ### 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

2

.