Physics - December 2007

water is like a conductor but you never hear about a fidh or ashark that like gets struck by lighning...hmmm

2007-12-12 02:37:32 · 2 answers · asked by Ashley 2

2007-12-12 02:31:22 · 6 answers · asked by Anonymous

A father (m=80 kg) and his son (m-40 kg) are ice skating toward each other at an angle of 30 degrees, son is moving towards the x axis at an angle of 30 degrees to the father and father is moving straight toward the origin. Both father and son have a speed of 2.5 m/s. Where they meet the son jumps on top of the father and they slide together acroos the ice.
Determine the magnitude and direction of their common speed just after the collision.

2007-12-12 02:31:22 · 1 answers · asked by Need help plz!!! 1

i did an investigation which involved me letting a truck go down a ramp + putting weights in it each time...started with no weights then put 500g, then 1k, then 1500g, then 2k. need to know the answer for an assignment for uni.

2007-12-12 02:29:01 · 2 answers · asked by Anonymous

A boat floating in fresh water displaced 16000 N of water. How many newtons of salt-water would it displace if it floats in salt-water of a specific gravity of 1.17?

The ANSWER IS 14,000 N, but how to I get that?

2007-12-12 02:21:12 · 5 answers · asked by bazjhi 1

No idea - maybe it is different but i'm sure it is the same.

2007-12-12 02:12:59 · 10 answers · asked by Anonymous

directly related to the:

a. product of the two masses.
b. velocity of the two masses.
c. distance between the two masses.
d. sum of the two masses.

2007-12-12 02:01:58 · 7 answers · asked by HOPING 1

"A d-t graph of a person running with uniform motion then gradually slowing down to a complete stop"

i put time on the x axis and distance on the y,
and my graph looks like a pyramid...
is that right?

2007-12-12 02:01:16 · 4 answers · asked by Anonymous

a. increases
b. decreases
c. remains the same
d. is unpredictable

2007-12-12 01:57:51 · 4 answers · asked by HOPING 1

The frictional force of the box is 50N.
What is the gain in kinetic energy of the box when it is moved through a distance of 6.0m?
1- 240J
2- 300J
3- 540J
4- 840J

2007-12-12 01:55:20 · 3 answers · asked by Princess of Death 1

In the movie back to the future, marty travels back to the future useing the delorian and lightning. Doc said that the car needed 1.21 gigawats to time travil. my question is can lightning hold 1.21 gigawats

2007-12-12 01:47:34 · 5 answers · asked by Anonymous

2007-12-12 01:30:01 · 2 answers · asked by Anonymous

why is the resistence like this?? and can you measure the resistence of a light bulb when hot and why??

2007-12-12 01:23:14 · 3 answers · asked by Anonymous

2007-12-12 01:17:40 · 3 answers · asked by Bridgette C 1

do you think that we would be able to achieve it before the end of this century?

2007-12-12 01:12:35 · 5 answers · asked by Anonymous

A U-tube open at both ends is partially filled with water. Oil having a density of 750 kg/m^3 is then poured into the right arm and forms a column 5.00 cm in height.

The right arm is shielded from any air motion while air is blown across the top of the left arm until the surfaces of the two liquids are at the same height. Determine the speed of the air being blown across the left arm. (The density of air is 1.29 kg/m^3.)

2007-12-11 23:25:05 · 1 answers · asked by secondaryhoper 1

How does motion occur at the subatomic-level? Could a subatomic-particle theoretically move a distance smaller than itself?

Sorry, I'll rephrase that.

If you analyzed the motion of an object, for instance, what's the smallest theoretically possible distance it could move? What I mean is, wouldn't you eventually get to a point so small that it just "appears" in a different distance, much like in examining the frames of a film?

I have an inkling feeling no-one will understand what I'm asking here.

2007-12-11 23:08:31 · 4 answers · asked by gl.fraenzi 2

Speed of Propagation vs. Particle Speed.

The equation
y(x,t)=Acos2(pi)f((x/v)-t)

may be written as

y(x,t)=Acos[(2pi/lambda)(x-vt)]

Use the last expression for to find an expression for the transverse velocity of a particle in the string on which the wave travels

Please help....i've been stuck on this forever...=)

2007-12-11 22:45:47 · 2 answers · asked by sandymandy 1

Every book explains us about the nuclear reaction and chain reaction but no one tells us where do we get the first neutron to start the reaction. Is there any special instrument to give neutrons? where do we get the first neutron? Please explain in detail

2007-12-11 19:42:02 · 7 answers · asked by mmbaskr 3

2007-12-11 19:30:43 · 4 answers · asked by ....................... 3

Car mass is 1500kg, starts from rest and accelerates to 18m/s in 12.0 seconds. Assume the air resistance remains constant at 400.0N during the time, what is the average power developed by the engine?

2007-12-11 19:20:40 · 2 answers · asked by Anonymous

Need help with PHYSICS problem (conservation of momentum)?
Here is the problem:

The longest bicycle in the workld was built in New Zealand in 1988 it is more than 20 m in length, has a mass of 3.4 x 10² kg, and can be ridden by four people at a time. Supposed four people are riding the bike south-east when they realize that the street truns and that the bike won't make it around the corner. All four riders jump off the bike at the same time with the same velocity (9.0 km/h to the northwest, as measured relative to Earth.) The bicylce continues to travel forward with the velocity of 28 km/h to the southeast. If the combined mass of the riders is 2.5 x 10² kg, what is the velocity of the bicycle and riders immediately before the riders escape?












i think its asking for v(initial), right?

does the change of direction affect the conservation of momentum??

the formula is m1x v1 (initial) + m2 x v2 (initial) = m1x v1 (final) + m2 x v2 (final)

please sovle and explain a little

2007-12-11 19:06:28 · 1 answers · asked by Tara V 2

Need help with PHYSICS problem (conservation of momentum)?
Here is the problem:

The longest bicycle in the workld was built in New Zealand in 1988 it is more than 20 m in length, has a mass of 3.4 x 10² kg, and can be ridden by four people at a time. Supposed four people are riding the bike south-east when they realize that the street truns and that the bike won't make it around the corner. All four riders jump off the bike at the same time with the same velocity (9.0 km/h to the northwest, as measured relative to Earth.) The bicylce continues to travel forward with the velocity of 28 km/h to the southeast. If the combined mass of the riders is 2.5 x 10² kg, what is the velocity of the bicycle and riders immediately before the riders escape?












i think its asking for v(initial), right?

does the change of direction affect the conservation of momentum??

the formula is m1x v1 (initial) + m2 x v2 (initial) = m1x v1 (final) + m2 x v2 (final)

please sovle and explain a little

2007-12-11 19:02:39 · 3 answers · asked by Tara V 2

alright i just took a test and am wicked confused on these 2 problems, any insight of what vormula or anything i should have used.. thanks...
A) a 1000kg car J of work are done on a 1110 kg car while it accelerates from 10 m/s to some final velocity. find this velocity?


thanks in advance!!!

2007-12-11 18:47:10 · 3 answers · asked by nothankyou1110 2

What can too many negative G-forces do to the human body?

Cause a black out or a red out?
Its one or the other!

2007-12-11 18:15:28 · 4 answers · asked by Kurbuk (Кирбук) 2

A jumbo jet starting from rest needs to attain a speed of 350 km/h on the runway to take off. Can this plane use a 1-km long runway if it is to accelerate at the rate of 2.67 m/s2 (meter per second squared)? Please explain why. Thanks.

2007-12-11 18:10:07 · 4 answers · asked by bea 2

The longest bicycle in the workld was built in New Zealand in 1988 it is more than 20 m in length, has a mass of 3.4 x 10² kg, and can be ridden by four people at a time. Supposed four people are riding the bike south-east when they realize that the street truns and that the bike won't make it around the corner. All four riders jump off the bike at the same time with the same velocity (9.0 km/h to the northwest, as measured relative to Earth.) The bicylce continues to travel forward with the velocity of 28 km/h to the southeast. If the combined mass of the riders is 2.5 x 10² kg, what is the velocity of the bicycle and riders immediately before the riders escape?

i think its asking for v(initial), right?

does the change of direction affect the conservation of momentum??

the formula is m1x v1 (initial) + m2 x v2 (initial) = m1x v1 (final) + m2 x v2 (final)

please sovle and explain a little

2007-12-11 18:09:18 · 2 answers · asked by Tara V 2

2007-12-11 17:25:11 · 3 answers · asked by Anthony V 1

A 13 gram bullet is stopped in a 6.38 kg block of wood. The speed of the bullet-plus-wood combination immediately after the collision is 0.593 m/s.

What was the original speed of the bullet in m/s?

2007-12-11 16:39:48 · 4 answers · asked by margarita_9902@sbcglobal.net 2

The new EV-1 electric car makes use of storage batteries as its source of energy. Its mass is 1300 kg and it is powered by 26 batteries, each 12 V, 52 A•h. assume that the car is driven on the level at an average speed of 40 km/hr and the average friction force is 240 N. Assume 100% efficiency and neglect energy used for acceleration. Note that no energy is consumed when the vehicle is stopped since the engine doesn’t need to idle.
(a) Determine the horsepower required.
(b) After approximately how many kilometers must the batteries be recharged?

2007-12-11 16:28:54 · 1 answers · asked by Anonymous