Physics - December 2007

Also, how and who determined light-years?

2007-12-03 23:21:05 · 4 answers · asked by Anonymous

But i heared tht some German scientist found a mass partical which can go faster than light. if it is then E=mc^2 is wrong right?

2007-12-03 23:15:56 · 6 answers · asked by Anonymous

this is a question that is buggin me since ninth grade. pls hlp.

2007-12-03 22:36:28 · 4 answers · asked by Ξlectronegative™дtif® 2

2007-12-03 21:41:15 · 4 answers · asked by Physics_Hard_YES 1

2007-12-03 19:57:59 · 7 answers · asked by disca_daniel 1

10. Can a body have momentum without having energy or energy without momentum?
11. Pressure is a scalar quantity while forces produced by the action of pressure are vectors. why?
12. Viscosity is an example of transported phenomenon. what property is being transported?
13. Why we become physically tired when we push against a wall, fail to move it and therefore do not work on it.
14. Two unequal masses are attached to the ends of a solid rod. Which mass is nearest to the centre of mass lighter or heavier and why?
15. Is the gravitational force a conservative force?
16. Why do auto manufacturers recommend using different viscosities of engine oil in cold and hot climate?
17. Soap films are much more stable thatn film of water, why?

2007-12-03 19:56:24 · 2 answers · asked by Steve S 1

please help me

2007-12-03 19:26:54 · 8 answers · asked by Chris B 1

2007-12-03 18:47:45 · 19 answers · asked by colzouk 1

2007-12-03 18:23:33 · 3 answers · asked by Anonymous

A trains departs from a station and accelerates at a constant rate of 32 feet per second per second. What is the speed of the train after one hour? If the train encouncters a curve, is it likely to derail?

2007-12-03 18:22:11 · 4 answers · asked by Anonymous

A dense plastic toy of mass 3 kg is floating just beneath the surface of a pond. What is the buoyant force on it?

Approximately 30 N right?

2007-12-03 17:54:36 · 3 answers · asked by Physics_Hard_YES 1

A small block of mass 0.09 kg is placed against a compressed spring at the bottom of a frictionless track that slopes upward at an angle of 40 degrees above the horizontal. The spring has k = 640 N/m and negligible mass. When the spring is released, the block travels a max distance of 1.8 m along the track before sliding back down. Before reaching this max distance, the block loses contact with the spring. (a) what distance was the spring originally compressed? (b) When the block has traveled along the track 0.8 m from its initial position against the compressed spring, is it still in contact with the spring? What is the kinetic energy of the block at this point?

2007-12-03 17:44:13 · 2 answers · asked by Heather P 1

A 15.0 m, 508 N uniform ladder rests against a frictionless wall, making an angle of 60.0° with the horizontal.
(a) Find the horizontal and vertical forces exerted on the base of the ladder by the Earth when an 814 N fire fighter is 4.00 m from the bottom. horizontal N 271.97N
vertical N 1322N
(b) If the ladder is just on the verge of slipping when the fire fighter is 9.00 m up, what is the coefficient of static friction between ladder and ground?

CAn someone give me a clue how to do part b? I calculated part a and I needed help on b! Thanks

2007-12-03 17:00:50 · 1 answers · asked by Anonymous

The oceans contain a tremendous amount of thermal (internal) energy. Why, in general, is it not possible to put this energy to work?

This is a Physics concept question and I have no idea.

2007-12-03 16:52:11 · 1 answers · asked by Dot 1

a 615kg racing car completes one lap in 14.3 s around a circular track with a radius of 50.0 m. The car moves at a constant speed. What is the Acceleration of the car? What force must the track exert on the tires to produce this acceleration? write the equation you use for it too....

2007-12-03 16:34:41 · 2 answers · asked by Anonymous

Find all values of t at which the particle changes direction. Justify your answer.

2007-12-03 16:28:21 · 1 answers · asked by help! 1

Two objects are made from the same material. They have different masses and temperatures.

If they don't experience the same temperature change, which object will experience the greater temperature change?

Please provide sources of info...I don't want faulty information.

2007-12-03 16:07:11 · 7 answers · asked by triciawin87 2

A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 1.5 m/s. How much thermal energy due to friction was generated in this process? in Joules

2007-12-03 16:03:47 · 3 answers · asked by joe s 1

A car traveling at 100 km/hr, stops in a distance of 70 m with constant acceleration. What is the magnitude of the acceleration? in meters per second squared

2007-12-03 16:01:43 · 3 answers · asked by joe s 1

Find the amount of heat required to change steam that is at 120 degrees celcuis to ice at 20 degrees celcuis. Can someone give me the formula to solve this problem?

2007-12-03 15:51:57 · 3 answers · asked by Momo 5

A race car driver must average 204.0 km/h over the course of a time trial lasting ten laps. If the first nine laps were done at 200.0 km/h, what average speed must be maintained for the last lap? (Answer to the nearest km/h.)


for all you math geniuses, its not 240 km/hr you have to manipulate the means or something

2007-12-03 15:38:04 · 7 answers · asked by gabriel_d_popuch 1

i need it for a sci. project

2007-12-03 15:33:56 · 1 answers · asked by Anonymous

I need help solving it...what is the equation i use?!!

2007-12-03 15:33:52 · 1 answers · asked by texxas815 1

365.25 days, the avg distance is 1.5 x 10^ 8 km and the Earth's mass is 6 x 10^24kg

2007-12-03 15:28:36 · 3 answers · asked by abbs 2

If all of earth's inhabitants moved to the equator, how would this affect Earth's rotational inertia? How would it affect the length of a day?

2007-12-03 15:18:28 · 4 answers · asked by Lo 2

A rock is thrown from a building at 60 degrees it lands 10.3 m away. How tall is the building?answer in m.?
mass-.77kg
vi-8.36
angle-60 degrees
d-10.3
a-9.8 m/s^2
assume: The ground is level and that the side of the building is vertical.

2007-12-03 15:17:41 · 2 answers · asked by Anonymous

The occupant inside a rotating space habitat of the future feels that she is being pulled by artificial gravity against the outer wall of the habitat. Which statement is FALSE?

1. Centrifugal force causes her to move in a circular path

2. At every moment her tendency is to move in a straight line path

3. The floor provides the centripetal force to keep her moving in a circular path.

4. The floor intercepts her path and presses against her feet.

2007-12-03 15:13:08 · 4 answers · asked by abbs 2

How much pressure is applied to the group by a 51kg man who is standing on square stilts that measure 0.04m on each edge? Answer in units of Pa.

2007-12-03 15:11:11 · 1 answers · asked by SoRealistic 3

I've tried to do both of these problems but im not getting the correct answers. Any help?

A monatomic ideal gas ( = 1.67) is contained within a box whose volume is 6.0 m3. The pressure of the gas is 3.00 105 Pa. The total mass of the gas is 3.5 kg. What is the speed of sound in the gas?

2)

A 3.49 rad/s (33 1/3 rpm) record has a 4.00 kHz tone cut in the groove. If the groove is located 0.130 m from the center of the record what is the "wavelength" in the groove?

2007-12-03 14:58:50 · 1 answers · asked by kimiij 2

2007-12-03 14:53:56 · 2 answers · asked by Anonymous