Physics - November 2007

If anyone could help me out with the following physics question, I would appreciate it greatly:

"An aircraft is traveling in a vertical loop of diameter 3000m. The pilot has a mass of 90kg. At the bottom of the loop, the seat exerts 2550N on the man.

a) At what speed is the plane flying?
b)What force does the seat exert on the man when he is upside down at the top of the loop?
c) What is the minimum speed that the plane can fly at so that the man will feel "weightless" at the top of the loop? (ie when will the seat not exert force on him?)"

If you could possibly give me full working out, that would be great. I especially need help with knowing when to add and subtract any force vectors, such as force of gravity and centrifugal force.

Thanks!

2007-11-02 18:46:26 · 3 answers · asked by Robbi 1

The material stiffness "k" that we model in any mechanical system, can we relate it the inertia of the system?
-The inertia is resistance to motion, but when we talk about stiffness its the measure of how much force is required to deform the material, now in classical spring element, deformation is considered as displacement, does that mean, we are talking about the same thing in different ways??

2007-11-02 18:35:32 · 5 answers · asked by param_mech 2

2007-11-02 18:29:14 · 2 answers · asked by Raymond F 2

A ship leaves its home port expecting to travel to a port 600 km due south. Before it moves even 1 km, a severe storm blows it 120 km due east. How far is the ship from its destination?

In what direction must it travel to reach its destination?
---° (south of west)

2007-11-02 17:59:51 · 5 answers · asked by matt w 1

the volume of rice is twice volume of cereal
the mass of rice is twice mass of the cereal
the weight of cereal is twice the weight of rice
the inertia of the cereal is twice inertia of rice

2007-11-02 17:50:06 · 3 answers · asked by Anonymous

Do you know any modern day physicists who helped form the modern model for an atom? Tell me who you think best influenced the modern, anyone after Bohr and his model. Thanks! You guys rock!

2007-11-02 17:00:19 · 5 answers · asked by smittykid102 2

tell why..

2007-11-02 16:56:35 · 4 answers · asked by grprettyangel 1

2007-11-02 16:54:10 · 6 answers · asked by grprettyangel 1

For the same mass of steam and boiling water, why is a jet of steam more dangerous than boiling water?

2007-11-02 16:46:23 · 6 answers · asked by darrenfoong1 2

Just wondering...

2007-11-02 16:38:20 · 11 answers · asked by carpe-diem 3

Ok, picture this:

A sailboat is on flat, calm water, with no wind. The sails are open. A fan is on the rear end of the sailboat blowing an unlimited amount of air into the sails.

Would the sailboat go forward, or reverse?

2007-11-02 16:30:47 · 6 answers · asked by Daniel P 1

At Sirius A's surface, the gravitational force between Sirius A and a 5 kg mass of hot gas has a magnitude of 925.1 N. Assuming that Sirius A is spherical, with a uniform mass of 4.851e+30 kg, what is Sirius A's mean radius?

2007-11-02 16:00:19 · 2 answers · asked by JJ 1

2007-11-02 15:43:43 · 3 answers · asked by Anonymous

i will be happy if i can get answers from u like people

2007-11-02 15:28:16 · 2 answers · asked by aryan 1

2007-11-02 15:21:22 · 2 answers · asked by Anonymous

2007-11-02 15:20:38 · 2 answers · asked by Anonymous

2007-11-02 15:20:07 · 3 answers · asked by Anonymous

2007-11-02 15:19:10 · 3 answers · asked by Anonymous

I know what liters are, and I know that Atm is pressure... but what exactly is liter atmospheres? I need to visualize this... is it the pressure on a liter? ... I know that it is supposed to be the same thing as energy in joules.

Can someone help with an example or an analogy or anything to help me see this please? ... I know the definition, but just need to visualize.

Thanks!

2007-11-02 13:47:14 · 1 answers · asked by db 3

A car rounds a banked curve where the radius of curvature of the road is R, the banking angle is , and the coefficient of static friction is µ.

(a) Determine the range of speeds the car can have without slipping up or down the road. (Use mu for µ, theta for , and R and g as appropriate in your equations.)

minimum speed _________
maximum speed __________


(b) What is the range of speeds possible if R = 110 m, = 10°, and µ = 0.14 (slippery conditions)?
minimum speed _________m/s
maximum speed _________m/s

2007-11-02 13:29:53 · 1 answers · asked by purple222 2

2007-11-02 12:50:21 · 1 answers · asked by brandi w 1

if two electrodes at a given length are set in a water tank at a given space apart from each other,they are tottally covered with water,then a external sorce of a given high voltage electricity in natural air is applied is it possible for any arcing to happen in the water....also if a plastic seperator is used at the top ends of the electrodes to keep the ends apart at the same given distance would it conduct electricity and lose some from the electrodes.thanks

2007-11-02 12:47:18 · 4 answers · asked by tugboat 4

If some one could help me break down how to do this it would be greatful.

2007-11-02 12:28:13 · 1 answers · asked by livfstdrivhrd 1

A 2.67 kg block slides down a frictionless plane, from rest, with an acceleration of 5.48009 m/s^2. What's the block's speed after travelling 2.1 m along the incline? Answer in m/s

I tried using unit analysis to figure it out and got
v=(distance x acceration)^1/2 = 3.392372319 m/s but the computer says its wrong?

I don't know if I am even on the right track. Please help!

2007-11-02 11:52:00 · 4 answers · asked by Anonymous

Block A has mass 1.00kg , and block B has mass 3.00kg . The blocks are forced together, compressing a spring S between them; then the system is released from rest on a level, frictionless surface. The spring, which has negligible mass, is not fastened to either block and drops to the surface after it has expanded. Block B acquires a speed of 1.20m/s .

What is the final speed of block A?
How much potential energy was stored in the compressed spring?

Please and thank you.

2007-11-02 11:50:43 · 1 answers · asked by brandon patrick 1

A space station shaped like a giant wheel has a radius 96 m and a moment of inertia of 4.96 108 kg·m2. A crew of 150 lives on the rim, and the station is rotating so that the crew experiences an apparent acceleration of 1 g. When 100 people move to the center of the station for a union meeting, the angular speed changes. What acceleration is experienced by the managers remaining at the rim? Assume that the average mass of each inhabitant is 65.0 kg.
____m/s2

2007-11-02 11:41:08 · 1 answers · asked by stars1234 2

In the picture below R1=2.00Ω and R2=4.00Ω. What value of R3 maximizes the dissipation rate in resistance 3? I worked it all out using Kirchoff’s laws and I got R3 = 10/7Ω. I would like to know if first this is correct and second what would happen if R2 is switched from 4.00Ω to 5.00Ω. I would like to see some work with 5.00 Ω, b/c the answer I keep getting is wrong.

http://www.lowellphysics.org/beta/resources/CH27/Problems/c27x27_11.xform_files/nw0394-n.gif

2007-11-02 11:38:35 · 1 answers · asked by Anonymous

The morning after a winter ice storm in Dallas, a 1400kg automobile going west on Chestnut Street at 35.0 km/h collides with a 2800kg truck going south across Chestnut Street at 50.0 km/h .
What is the magnitude and direction of their velocity after colliding?

2007-11-02 11:21:54 · 2 answers · asked by brandon patrick 1

A 2.60-m-long, 340 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 75.0 kg construction worker stands at the far end of the beam. What is the magnitude of the torque about the point where the beam is bolted into place?

2007-11-02 11:09:53 · 3 answers · asked by rochesmk 2

(a) A very powerful vacuum cleaner has a hose 3.05 cm in diameter. With no nozzle on the hose, what is the weight of the heaviest brick that the cleaner can lift?
N
(b) A very powerful octopus uses one sucker of diameter 3.05 cm on each of the two shells of a clam in an attempt to pull the shells apart. Find the greatest force that the octopus can exert in salt water 32.3 m depth.
N

2007-11-02 10:42:47 · 1 answers · asked by Anonymous