# Search results for query: *

1. ### A cylinder containing hydrogen gas

sorry, i don't know what that means. Terrible at physics...
2. ### Volume of the bubble

Homework Statement A bubble with a volume of 1.00 cm3 forms at the bottom of a lake that is 40 m deep. The temperature at the bottom of the lake is 10°C. The bubble rises to the surface where the water temperature is 31°C. Assume that the bubble is small enough that its temperature always...
3. ### A cylinder containing hydrogen gas

Homework Statement A cylinder contains 270 L of hydrogen gas (H2 at 0.0 C) and a pressure of 10 atm. How much energy is required to raise the temperature of this gas to 31°C? (answer needs to be kJ) Homework Equations PV =nRT and Q= MCT The Attempt at a Solution PV = nRT==> M=...
4. ### Displacement of a traveling wave

Homework Statement The displacement (in meters) of a wave is y = 0.13 sin(t - 3.82x), where t is in seconds and X is in meters. (a) Is this wave traveling in the +x or -x direction? 1.+x direction. 2.-x direction (b) What is the displacement y when t = 26.5 s and x = 6.4 m...
5. ### Solving for Pressure Rise in Manometer with Oil & Mercury

yea i got 10.76. Its not right...
6. ### Solving for Pressure Rise in Manometer with Oil & Mercury

ok. so i set the to two pressures equal to each other so i got P(oil)=P(mercury) (.91)(980)h = (980)(.72)(13.6) solved for h, and provided my answer in cm but its not right :\
7. ### Solving for Pressure Rise in Manometer with Oil & Mercury

Homework Statement A manometer using oil (density 0.91 g/cm3) as a fluid is connected to an air tank. Suddenly the pressure in the tank increases by 0.72 cm of Hg. (a) By how much does the fluid level rise in the side of the manometer that is open to the atmosphere? (b) What would your...
8. ### Area of a silver sheet

OMG THANKYOU. That did the trick. They wanted us to use density of 1024 for water in a previous problem so i was still using that. Thanks for all your help!
9. ### Area of a silver sheet

ok that's what i was thinking. So i did .262/9.8 to get the mass as .0267. Then I divided this by the volume (3.87 × 10-5 m3 ) to get the density of alcohol. Then i divided that density by the density of water (1024), to find the specific gravity. ...its not correct...:(
10. ### Area of a silver sheet

so shouldn't that just mean that I should be able to use .0773 kg / 3.87 × 10-5 m3 to get the density of alcohol??
11. ### Area of a silver sheet

hmm. so i do i subtract out the mass of the aluminum cylinder (.104) from the apparent wieght in alcohol and then use the new mass in my calculation (m/v)/density of water?
12. ### Area of a silver sheet

ok...soooo since weight = m x g do i divide by 9.8? sorry I am retarded when it comes to conversions...
13. ### Area of a silver sheet

Thanks cepheid...that makes sense. I had totally forgotten the density = m/v formula. I have another question that has been troubling me regarding specific gravity... An aluminum cylinder weighs 1.02 N. When this same cylinder is completely submerged in alcohol, the volume of the displaced...
14. ### Area of a silver sheet

@Sean -Ahhh that works perfectly. I have no idea what i did tho. lol
15. ### Area of a silver sheet

Homework Statement Accomplished silver workers in India can pound silver into incredibly thin sheets, as thin as 3.00x10-7 m (about one hundredth of the thickness of this sheet of paper). Find the area of such a sheet can be formed from 1.39kg of silver? (For the density of silver use the...
16. ### Calculate a diver's turns in air

Homework Statement The rotational inertia for a diver in a pike position is about 15.5 kg m2; it is only 8.0 kg m2 in a tucked position (the figure above). (a) If the diver gives himself an initial angular momentum of 106 kg m2/s as he jumps off the board, how many turns can he make when...
17. ### THe change of energy HELP please

Ok so I used 1/2Mr^2 for inertia.. and did the same thing as before and got 5666.367 still wrong... uhhhhhh!
18. ### To spin a LP turntable

Thanks a bunch!
19. ### THe change of energy HELP please

Ok so i found the moment of inertia of a solid to be 2/5mr2. Used that in the eqn to solve for angular velocity. Then I multiplied that number by 2pie n divided by 60 to get 6330.554 rev/min. This is wrong too! :/
20. ### THe change of energy HELP please

Homework Statement A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk and its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative to batteries in electric...
21. ### To spin a LP turntable

I tried doing it both ways. I am so confused as to which formula to use. But i believe i know how to find moment of inertia. I used the formula I =mr2 and then multiplied that with acceleration n still got the wrong answer...
22. ### To spin a LP turntable

that gives me an angular accelration of .580 using that to find Torque: T = F (r) = MA (r) =.26 *.589 8.154 =.023? ahhhhh what am i doing wrong?? :(
23. ### To spin a LP turntable

yea I am still not getting the right answer for torque...
24. ### To spin a LP turntable

SOoo... 10.682= 0 + 2*ang acc * .308 m 114= .616angaccl 185.06=ang accl?
25. ### To spin a LP turntable

1.72 rev= 10.68rad Im confused..? The problem says that final speed should b 1.72 n ur right about the initial speed.
26. ### To spin a LP turntable

Already tried that. I got 10.682=3.522+ 2*angaccel*193.5 (multiplying diameter by 2pie) solving for ang accelration, i got ...26.25 ...which is wrong...
27. ### Boom Supported by a Cable

yup that was a typo. sooo what ur saying is..in order to find Torque: Torque = Tsin 35(2.38) - [80(1.5) + 120(3)] 480 = T sin 35(2.38) T = 350! Thankyou!
28. ### To spin a LP turntable

ummm... I multiplied the diameter (after converting into m) by 2 pie, in order to get theta. then i solved for angular acceleration in order to find torque in the eqn: Torque = Impulse * angular acceleration. however this didn work for me either... sooo I am lost...
29. ### To spin a LP turntable

you are right. I found the eqn : w=ang velocity @-ang accelration theta - angle w2f = wi2 + 2@theta. how do i find theta?
30. ### Boom Supported by a Cable

Homework Statement A sign is supported by a uniform horizontal boom of length 3.00 m and weight 80.0 N. A cable, inclined at an angle of 35 with the boom, is attached at a distance of 2.38 m from the hinge in the wall (see figure below). The weight of the sign is 120 N. What is the tension...
31. ### To spin a LP turntable

Homework Statement An LP turntable must spin at 3.52 rad/s to play a record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 1.7 revolutions, starting from rest? The turntable is a uniform disk of diameter 30.8 cm and mass 0.26 kg. Homework...

yea i tried it again. still no success. I think i give up now.

I should say the length of the distance from the satellite to the planet... not the length of orbit...

well i assumed since we don't know the gravity of that planet the length of the orbit would be equal to the G. However, I am still not able to get the right answer using either method...

ahhh i still didn't get the right answer..? maybe I am just doing my arithmatic wrong. but why would gravity = 6.67?

Please help asap! Orbital speed Homework Statement A satellite is placed in orbit 5.19x105m above the surface of Jupiter. Jupiter has a mass of 1.90x1027kg and a radius of 7.14x107m. Find the orbital speed of the satellite. Answer = m/s Homework Equations v = sqrt [GM/r]...
37. ### Artificial gravity in a washing machine

yea the definition for acp=r w2 so i got .026m * (25.132rad/sec)2 = 16.422 then i divided that number by 9.8...it didn't work :( any ideas??
38. ### Artificial gravity in a washing machine

So i did v2/r and I divided that number by 9.8 since it asks for a multiple of G. I did not get the answer. I also do not understand why you say it should be centripedal and not centrifugal
39. ### Artificial gravity in a washing machine

Homework Statement If a washing machine's drum has a radius of 26 cm and spins at 4 rev/s, what is the strength of the artificial gravity to which the clothes are subjected? Express your answer as a multiple of g. Homework Equations w = distance/time w= (angular velocity) The...
40. ### Work and Energy of a climbing person

Homework Statement How many meters above the ground would a person ( 188.3 lb ) have to climb to gain 3 kilojoules ( 3000 joules ) of potential energy. We usually measure our weight ( W = mg ) in pounds. For conversions, you may need to know that 1 pound is equal to 4.448 Newtons...
41. ### Boat crossing a river

Homework Statement A boat that can travel at 4.0 km/h in still water crosses a river with a current of 1.8 km/h. At what angle must the boat be pointed upstream to travel straight across the river? In other words, in what direction is the velocity of the boat relative to the water? 1...
42. ### The collision between two pucks

Thankyou so much! This was such a help to say the least
43. ### The collision between two pucks

Your numbers worked out perfectly. I don't understand where i am going wrong, because i am not getting your numbers. can you do a step by step please? id really appreciate it.
44. ### The collision between two pucks

Homework Statement Puck A has a mass of 0.294 kg and is moving along the x-axis with a velocity of 5.55 m/s. It makes a collision with puck B, which has a mass of 0.588 kg and is initially at rest. The collision is not head-on. After the collision, the two pucks fly apart with the angles shown...
45. ### Find the Ratio: Solving Recoil Speed in Homework Equations

nevermind...got it
46. ### Find the Ratio: Solving Recoil Speed in Homework Equations

Im sorry, I don't understand. I am a beginner at physics and don't have a good basis. Was I on the right track. If not, can you demonstrate what ur saying
47. ### Find the Ratio: Solving Recoil Speed in Homework Equations

Homework Statement A person is standing on a sheet of ice so slippery that friction may be ignored. This individual fires a gun parallel to the ground. When a standard cartridge is used , a 13-g bullet is shot forward with a speed of 290 m/s, and the person recoils with a speed of vc. When a...
48. ### Drag race- avg power output

Sorry, my typo, I meant to say i got avg velocity by using the above equation. I got acceleration by using vf - vo/t. Using that info, i plugged it into P = FV (avg V)
49. ### Perfectly inelastic collision

Homework Statement Kevin has a mass of 84.2 kg and is skating with in-line skates. He sees his 23.2-kg younger brother up ahead standing on the sidewalk, with his back turned. Coming up from behind, he grabs his brother and rolls off at a speed of 1.74m/s. Ignoring friction, find Kevin's speed...
50. ### Drag race- avg power output

RoyalCat, I cannot see the formula u posted. please try it again