Physics - June 2007

of a 25 kg sheep traveling east at 10m/s?

2007-06-18 05:45:31 · 4 answers · asked by Amy M 5

A small space probe of mass 220 kg is launched from a spacecraft near Mars. It travels toward the surface of Mars, where it will eventually land. At a time 22.9 seconds after it is launched, the probe is at location < 4100, 7500, 0 > m, and at this same instant its momentum is < 41000, -8100; 0 > kg·m/s. At this instant, the net force on the probe due to the gravitational pull of Mars plus the air resistance acting on the probe is < -4850, -730, 0 > N. Assuming that the force is nearly constant during the time interval from 22.9 seconds after the probe is launched to 23.3 seconds after the launch, so that the velocity is changing at a constant rate, what is the change of the position of the probe during this time interval?
I get = < 74.5 ,-14.73 , 0 > m.
I don't understand why the 74.5 is wrong.

2007-06-18 05:31:08 · 2 answers · asked by Ashley 2

An old freight train at rest or a roller-skate moving downhill?

2007-06-18 05:21:13 · 7 answers · asked by Amy M 5

I lost my moms necklace and i cant find it. And It was 3 days ago

2007-06-18 04:57:40 · 2 answers · asked by Nimali F 5

2007-06-18 04:56:23 · 5 answers · asked by Damini S 1

We have to accept one of two mind-blowing possibilitites. Either time has no beginning and the universe has been in existance eternally, or the Universe began from absolutely nothing. No matter, no micro-organisms, no light - absolutely nothing (otherwise where did they come from and when did their existance begin). I think my head is about to explode - so which is it?

2007-06-18 04:46:58 · 13 answers · asked by Chavowsky 1

Va reads more electric than watts which is right va is volts*amps

2007-06-18 04:37:41 · 6 answers · asked by Anonymous

The question below involves physics concepts like power and force:

The engine in a 1500 kg car has a maximum power output of 200 horsepower, but 25% of the power is lost before reaching the drive wheels. The car has a front profile that is 1.6 m wide and 1.4 m high. The coefficient of rolling friction is 0.02.
a) What is the car's top speed?
b) Is this answer reasonable?

2007-06-18 04:15:57 · 3 answers · asked by Anonymous

A 0.150 kg block is placed on a light vertical spring (k = 5.40 103 N/m) and pushed downward, compressing the spring 0.100 m. After the block is released, it leaves the spring and continues to travel upward. What height above the point of release will the block reach if air resistance is negligible?

The answer I got is 0.184m which for some reason is "off by multiples of ten". What conversion do I use for this?

2007-06-18 03:48:08 · 1 answers · asked by Katie 1

The wind certainly makes you feel cold. Yet a fan blowing on a thermometer does not change the reading! Even though both thermometers and people have red noses, they differ in the effect that the wind has. How could you discuss the other respects in which you differ from a thermometer that that might explain this?

2007-06-18 03:00:57 · 5 answers · asked by elliemae2891 1

2007-06-18 02:47:20 · 6 answers · asked by Manas 1

2007-06-18 02:34:41 · 8 answers · asked by Anonymous

2007-06-18 02:17:17 · 10 answers · asked by Anonymous

given that 1 angstrom=0.1 nm

what is 1 angstrom in a) cm b) m c) mm?

2007-06-18 02:15:16 · 6 answers · asked by makemerepeat 1

how can u transfer water to an empty container without pouring it,with the use of yarn thread?

2007-06-18 02:07:45 · 7 answers · asked by nin2hour 1

2007-06-18 01:51:01 · 5 answers · asked by Eugene A 1

What is the most elastic material? (The material you can stretch the most and furthest without breaking it)

2007-06-18 00:59:44 · 3 answers · asked by ntm495 4

What bends AWAY from the normal more

Index of refraction 1 : 1.53
Index of refraction 2: 1.22

2007-06-18 00:54:10 · 2 answers · asked by de4th 4

No homework. Explain please. Thanks.

2007-06-18 00:08:24 · 11 answers · asked by Dovey 7

2007-06-17 23:57:40 · 2 answers · asked by Akriti M 1

To reduce global warming we have to block or to change direction of some of the incoming photon towards the earth's surface so that these photon could not reach the earth's surface.
The photon have to pass the atmospheric air of the world to reach the earth's surface.
The path of any electromagnetic wave changes with change in the density of the medium by which it passes through.
So the path of incoming photon towards the earth surface may be changed if the density of atmospheric is changed.
we can use sound wave for this purpose.
When sound passes through air ; the air is divided into many layers of different density.
Suppose we plase a very high powerful and high frequency sound sourse at some height from the ground.
When the sound source start producing sound wave of high frequency the atmospheric air above the sound source will be divided into many adjucent layer of different density.
So a good percent of the incoming photon canchange direction or reflect

2007-06-17 23:53:04 · 6 answers · asked by Shamiul_islam 1

if a object is droped 4 a hot air ballon moving up at a contant speed then why does the object first moves upwards and then goes down

2007-06-17 23:49:13 · 4 answers · asked by Anonymous

2007-06-17 23:17:40 · 5 answers · asked by Anonymous

2007-06-17 23:16:35 · 3 answers · asked by Anonymous

Just wanna hear from other people. So, is light matter or just some weird particle?! =)

2007-06-17 23:07:04 · 7 answers · asked by Anonymous

2007-06-17 22:21:25 · 5 answers · asked by Anonymous

2007-06-17 22:13:19 · 2 answers · asked by renz v 1

in newtons law it states that for every action there is an opposite and equal reaction. but when i shine a flashlight the light gose foward but the flashlight dose not go back. Why?

2007-06-17 21:43:57 · 4 answers · asked by bass boy 2

A film projector produces a 1.51 m image of a horse on a screen. If the projector lens is 4.00 m from the screen and the size of the horse on the film is 1.07 cm, what is the magnitude of the magnification of the image?
141
14.1
0.708
7.08 x 10^-3

2007-06-17 20:16:40 · 3 answers · asked by Anonymous

In a vacuum, electromagnetic radiation of short wavelengths :

travels as fast as radiation of long wavelengths.
travels slower than radiation of long wavelengths.
travels faster than radiation of long wavelengths.
can travel both faster and slower than radiation of long wavelengths

2007-06-17 20:13:59 · 4 answers · asked by Anonymous