Physics - March 2007

2007-03-06 09:05:32 · 7 answers · asked by Anonymous

I've got an answer, but I don't know if it's right. Could someone help me? Thx!

A tractor pulls a log 880 meters and the tension in the cable connecting the tractor and log is approximately 1100 kilograms (10787.6 newtons).

Approximate the work done if the direction force is 55.562 degrees above the horizontal. Answer in units of newton-meters.

2007-03-06 09:04:17 · 2 answers · asked by sg88 1

a person is driving a 1500kg snowmobile down a hill. the hill is inclined at an angle of 30degrees to the horizontal and has a coeffcient of friction of 0.28. what force must the snowmobile's engine apply to cause the snowmobile to accelerate at 0.60g?
the answer is applied force= 5034 N

thanks!!!

2007-03-06 08:53:54 · 1 answers · asked by Anonymous

1)

The net force acting on a particle is conservative and increases the kinetic energy by 300J. What is the change in:
a. potential energy
b. total energy

I was thinking that the potential energy wouldn't change because the kinetic energy is dependant on the velocity.

2)

Analyze the motion of a simple swinging pendulum in terms of energy
(a) ignoring friction
(b) taking friction into account
Explain why the grandfather clock must be wound up.

I was thinking the net work would be zero in a grandfather clock if the friction was zero. I was also thinking that with friction the kinetic energy would be depleted by the nonconservative force of friction and the net force would eventually become zero.

Thanks!

2007-03-06 08:51:15 · 1 answers · asked by mono 1

2007-03-06 08:33:18 · 7 answers · asked by The Most Beautiful Men 1

the rest of the question is, find the speed and direction of the 2 objects just after the collision.

2007-03-06 08:29:29 · 1 answers · asked by kimberly b 1

Even a little bit? If not, why is that?

2007-03-06 08:23:54 · 8 answers · asked by nature_and_joy 1

A pendulum clock is placed abroad a jet cruising at
constant altitude with speed v. What is 'time dilation'
onboard the plane, according to the clock? Orbital
speed of low satellite is s = 7.9km/s.

Ignore rotation of the earth.

2007-03-06 08:14:43 · 2 answers · asked by Alexander 6

a skateboarder slides down a frictionless ramp inclined at an angle 30degrees to the horizontal.he then slides across a frictionless horizontal floor and begins to slide up a second incline at an angle of 25degrees to the horizontal.the skateboarder starts at a distance of 10m from the bottom of the first incline.how far up the second incline will he go if the coefficient of kinetic friction on the second incline is 0.10?

the answer is 9.8 metres

thanks!!!!

2007-03-06 08:13:46 · 1 answers · asked by Anonymous

Newton's law says that force is the mass of an object times its acceleration. F = m.a
If a train is moving at a constant speed say 50mph from point A to point B, its acceleration will be zero because the speed is not changing. Does this mean that the train's force is zero?

Pls help

2007-03-06 08:13:27 · 4 answers · asked by Anonymous

sorry im crap at this
if you were to send a flow of electrons down a wire and measure its resistance then change the lengh of the wire what would happen?
will the relationship be a proportianal relationship like if you double the lengh will resistance double or triple or something
sorry its unclear
thankyouxxx

2007-03-06 07:56:30 · 8 answers · asked by bitter sweet 2

I need help please

2007-03-06 07:53:42 · 6 answers · asked by Anonymous

a skateboarder slides down a frictionless ramp inclined at an angle 30degrees to the horizontal.he then slides across a frictionless horizontal floor and begins to slide up a second incline at an angle of 25degrees to the horizontal.the skateboarder starts at a distance of 10m from the bottom of the first incline.how far up the second incline will he go if the coefficient of kinetic friction on the second incline is 0.10?

the answer is 9.8 metres

thanks!!!!

2007-03-06 07:26:44 · 2 answers · asked by Anonymous

2007-03-06 07:01:56 · 1 answers · asked by Devil 4

2007-03-06 06:50:19 · 7 answers · asked by lamika_love 1

explain using physics terms

2007-03-06 06:47:14 · 3 answers · asked by Anonymous

2007-03-06 06:46:38 · 13 answers · asked by doughboy 1

i used a duel oscilloscope,
which was set to :
2.0 × 10^-8 seconds per center meter,
the light path i created was 4112cm, in length, the difference on the dual oscilloscope was 3.1cm, (peek to peek)


how do i from there calculate the speed of light?
(top answer goes to best explained)


so far i did 3.1(2.0 × 10^-8) = 6.2 x 10^-8
then speed= distance divided by time taken(unit given in how much you want the answer unit to be)
4112/6.2 x 10^-8 = ~ 6.632258 x 10^10, which i know is way over the speed of light, were have i gone wrong?

2007-03-06 06:42:30 · 2 answers · asked by Anonymous

i have wondered this for a long time really because the plane is away from the ground so if it was going all the way round the world then it is a greater distance but then i wondered how you calculate for the fact that in different parts of the world the shadow would be further away oh i dont know can you help me get this out of my head please thank you xxx

2007-03-06 06:35:32 · 14 answers · asked by vici 4

because metals (that are commercially pure) are much weaker than alloys, is it true that alloys are used more for heavy duty work? could you give some details or examples of uses for alloys and metals?

2007-03-06 06:21:54 · 4 answers · asked by amandac 3

To do so, should he simply aim at the mirrored image of his assailant?

2007-03-06 06:17:19 · 3 answers · asked by whoknows 1

I have graph of velocity squared against distance x and determine the acceleration from this. I have to take the gradient of this but I am confused on these units - would this answer be the average acceleration. I then have to relate this by makin v2=u2+2as into the same form of y=mx+c. Does anyone understand this and if so please can you point me in the right direction. Thank you in advance for anyone who takes the time to help me out.

2007-03-06 06:15:26 · 5 answers · asked by Anonymous

i'm comparing the youngs modulus of copper with constantan. constantan is the alloy where copper (as u know) is a pure metal. thing is, i research the youngs modulus for both materials on the net and i got 110 MPa for constantan and 124 GPa for copper. now that i'm calculating the youngs modulus from these graphs i've got from the teacher, constantan is getting the higher youngs modulus as compared to copper.
i know i haven't calculated anything wrong, so thats not a possibility.
so would you expect an alloy to have a higher youngs modulus than a pure metal?

2007-03-06 06:10:11 · 1 answers · asked by amandac 3

A diverging lens (f = -11.5 cm) is located 20.0 cm to the left of a converging lens (f = 33.5 cm). A 3.00 cm tall object stands to the left of the diverging lens, exactly at its focal point.

(a) Determine the distance of the final image relative to the converging lens (in cm)

(b) What is the height of the final image (including proper algebraic sign)?

2007-03-06 06:06:41 · 1 answers · asked by christian m 2

It's a snowy day and you're pulling a friend along a level road on a sled. You've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. You've been walking at a steady 1.5 m/s, and the rope pulls up on the sled at a 24.0 degrees. You estimate that the mass of the sled, with your friend on it, is 65.0 kg and that you're pulling with a force of 75.0 N.

Coefficient of friction between the sled and the snow is?

2007-03-06 05:47:24 · 2 answers · asked by RelientKayers 4

2007-03-06 05:45:05 · 13 answers · asked by Anonymous

To stretch a spring a distance 3.08cm from its unstretched length, an amount of work of 11.0J must be done.

How much work must be done to compress this spring a distance 3.90cm from its unstretched length?

2007-03-06 05:33:50 · 1 answers · asked by ♡♥EM♡♥ 4

I always keep things in my freezer to provide some thermal mass to retain the cold and keep the fridge from having to work so hard. Would bottled water retain cold better than bottles of booze because it freezes or would the booze do a better job because it doesn't?

2007-03-06 05:14:18 · 5 answers · asked by torklugnutz 4

2007-03-06 05:07:53 · 5 answers · asked by cody1kaos 1

c) Calculate how much energy a colour television that has power rateing of 0.120 kW.h uses in one week if it operates 9 h per day.

Data:Equation:
Electrical energy used = ? kW.hE= P x∆t
Time interval = 9h x 7 = 63 hE= 0.120 kW x 63h
Power = 0.120 kWE= 7.56 kW.h
The electrical energy the television is using in one week is 7.56 kWh.

Colour Television used 7.56 kWh
Cost = elcectrical energy ( kW.h) x rate ( cost per kW.h)
Cost = 7.56 kW.h x 0.08 per kW.h
Cost = $0.60
The cost to operate the television for 7.56 kWh is $0.60.


Is this correct... Seems to me that 60 cents for 9 hours of tv per day is a very small amount. Thats why I thought I was doing something wrong?

2007-03-06 04:34:26 · 4 answers · asked by Anonymous