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...
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=...
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...
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 :\
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...
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!
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...:(
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?
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...
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...
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...
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! :/
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...
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...
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...
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!
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...
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...
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...
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...
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]...
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
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...
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...
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...
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.
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...
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
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...
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)
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...