Physics - November 2007

The burner on an electric stove has a power output of 2kW. A 660 g stainless steel tea kettle is filled with 20 degree C water and placed on the already hot burner. If it takes 2.60 min for the water to reach a boil, what volume of water, in cm^3, was in the kettle? Stainless steel is mostly iron, so you can assume its specific heat is that of iron.

2007-11-18 01:52:20 · 1 answers · asked by gbutterfly339 1

when a point of infinite density began to expand at very fast speed wouldn't time exist before hand so that the events needed for that big bang could happen?

2007-11-18 01:45:55 · 14 answers · asked by Anonymous

A work W0 is required to stretch a certain spring 2 cm from its equilibrium position.
Suppose the spring is already stretched 2 cm from equilibrium. How much additional work (in terms of W0) is required to stretch it to 3 cm from equilibrium?

2007-11-17 19:53:26 · 2 answers · asked by p0oh 1

It takes 115 J of work to compress a certain spring 0.12 m.
(a) What is the force constant of this spring?
correct check mark kN/m
(b) To compress the spring an additional 0.12 m,
Calculate the work required to compress the spring this additional amount

2007-11-17 19:51:47 · 1 answers · asked by p0oh 1

a certain gas at 101.325 kpa and 16deg C whoose volume is 2.83m^3 are compressed into a storage vessel of .31 m^3. Before admission, the storage vessel contained the gas at a pressure and temperature of 137.8kpa and 24degrees Celcius. After the admission, the pressure has increased to 1171.8 kpa.What should be the final temperature of the gas in the vessel in kelvin?

2007-11-17 19:06:12 · 1 answers · asked by J-weak 2

What can you do with energy?

2007-11-17 17:13:30 · 4 answers · asked by Anonymous

Lee is rolling along her 4 kg skateboard with a constant speed of 3 m/s when she jumps off the back and continues forward with a velocity of 2 m/s relative to the ground. This causes the skateboard to go flying forward with a speed of 15.5 m/s relative to the ground. What is Lee's mass?

2007-11-17 16:13:11 · 3 answers · asked by Light Up the Sky 1

Valentina, the Russian Cosmonaut, goes outside her ship for a spacewalk, but when she is floating 15 m fro her ship, her tether catches on a sharp piece of metal and is severed. Valentina tosses her 2 kg camera away from the spaceship with a speed of 12 m/s

How fast will Valentina, whose mass is now 68 kg, travel toward the spaceship?

Assuming the spaceship remains at rest with respect to Valentina, how long will it taker her to reach the ship?

2007-11-17 16:11:56 · 1 answers · asked by Light Up the Sky 1

Anthony and Sissy are in a rollerskating dance championship. While 75 kg Anthony rollerskates backwards at 3.0 m/s, 60 kg Sissy jumps into his arms with a velocity of 5 m/s in the same direction.

How fast does the pair roll backwards together?

If Anthony is skating toward Sissy when she jumps, could their combined final velocity be larger or smaller than your answer to part a? Why? show calculations

Thanks in advance!

2007-11-17 16:09:56 · 1 answers · asked by Light Up the Sky 1

Jeanne rolls a 7 kg bowling ball down the alley for the league championship. One pin is still standing, and Jeanne hits it head on with a velocity of 9 m/s. The 2.0 kg pin acquires a forward velocity of 14 m/s. What is the new velocity of the bowling ball?

2007-11-17 16:07:29 · 1 answers · asked by Light Up the Sky 1

During an autumn storm, a 0.012 kg hail stone traveling at 20 m/s made a .20 cm deep dent in the hood of a person's car. What average force did the car exert to stop the damaging hail stone?

2007-11-17 15:48:24 · 1 answers · asked by Light Up the Sky 1

What gauge pressure must a machine produce in order to suck mud of density 1500 kg/m3 up a tube by a height of 3.01 m?

2007-11-17 15:35:47 · 2 answers · asked by shade o 1

I read absorption spectrum on wikipedia but I don't understand it, how do you define it?

2007-11-17 15:32:10 · 2 answers · asked by fabulous101 2

Since F = ma, if a car traveling at constant velocity hits you, does it technically exert a "force" on you if there's no acceleration?

2007-11-17 15:14:38 · 5 answers · asked by Anonymous

2. The longest snake ever found was a python that was 10.0 m long. Suppose a coordinate system large enough to measure the python’s length is drawn on the ground. The snake’s tail is then place at the origin and the snake’s body is stretched so that it makes an angle of 60.0°, with the positive x-axis. Find the x and y coordinates of the snake’s head. (Hint: the y-coordinate is positive).

2007-11-17 14:28:50 · 3 answers · asked by Venia c 1

a flight attendant pulls her 70.0 N flight bag a distance of 253m along a level airport floor at constant velocity. The force she exerts is 40.0 N at the angle of 52.0 degree above the horizontal. what is the work she does on the flight bag and the work done by the force of friction on the flight bag.
help please..............

2007-11-17 14:27:44 · 3 answers · asked by 832 1

2007-11-17 14:05:18 · 5 answers · asked by poohchii_pooh_xx7 1

explain plzzz...i need it..tnx..

2007-11-17 13:57:24 · 4 answers · asked by rAvEn JoHn 2

you have a patient that is currently expererience extreme discomfort after eating a large quantity of beans. the pain is being caused by the build up of gas pressure in the lagre intestines. if you were able to put a pressure gauge into the the patient, which of the following would be a reasonable pressure that you might observe?

a.) 860 pounds pers square inch

b.) 860 pascal

c.)860 atmospheres

d.) 860 torr

2007-11-17 13:32:48 · 4 answers · asked by Katrina Green 2

2007-11-17 13:32:48 · 9 answers · asked by ike 3

a flywheel of radius .58m and moment of inertia of 17kg*m^2 rotates initially at a rate of 4.5 rev/sec. If a force of 4.8N is applied tangentially to the flywheel to slow it down, how much work will be done by this force in bringing the flywheel to a stop?

2007-11-17 12:57:33 · 1 answers · asked by Joanna H 1

a flight attendant pulls her 70.0 N flight bag a distance of 253m along a level airport floor at constant velocity. The force she exerts is 40.0 N at the angle of 52.0 degree above the horizontal.Find the flollowing:
a)the work she does on the flight bag.
b.)the work done by the force of friction on the flight bag.
c.)the coefficient of kinetic friction between the flight bag and the floor.

2007-11-17 12:45:02 · 1 answers · asked by 832 1

transparent is when u can see completely through and translucent is when u can only partialy see through or can't see through clearly right?

2007-11-17 12:43:00 · 3 answers · asked by mitodo_amor 2

what is the kinetic energy of an automobile with a mass of 1250 kg traveling at a speed of 11 m/s?

2007-11-17 12:39:54 · 1 answers · asked by 832 1

3. You have a laser with wavelength = 635.3[nm]. The grating has a slit spacing of 1.633E-03[mm]. What is the angle measured for n=1?
angle = _____________________[radian]
Use three sig. figs.; or use N/A, if not enough information is given.

please help and explain this ,thanks

2007-11-17 12:10:33 · 2 answers · asked by Anonymous

You have a laser with wavelength (λ) 640 nm. You shine it through a diffraction grating of 400 lines per millimeter. You measure the distance to a screen to be 20.3 cm. You measure the second dot in millimeters from the center dot.
What is the wavelength of the laser light?
__________________[nanometer].
Use three significant figure or N/A if not enough information is given.

2007-11-17 12:08:16 · 1 answers · asked by Anonymous

Because of a higher moisture content, air is a better conductor of charge in the summer than in the winter. Would you expect the shocks from the static electricity to be more severe in the summer or winter? Explain.

2007-11-17 11:59:38 · 4 answers · asked by Jennifer N 1

Tarzan and Jane, whose total mass is 137 kg, start their swing on a 4.6 m. long vine when the vine is at an angle 32.6 degrees with the horizontal. At the bottom of the arc, Jane, whose mass is 47 kg, releases the vine. Acceleration of gravity is 9.81 m/s^2. What is the maximum height at which Tarzan can land on a branch after her swing continues? (Hint: Treat Tarzan's and Jane's energies as separate quantities.) Answer in units of m.

Thank you very much for your help in advance!

2007-11-17 11:56:45 · 3 answers · asked by Anonymous

A 9.3 kg block is dropped onto a spring of spring constant 1086 N/m from a height of 800 cm. When the block is momentarily at rest, the spring has been compressed by 50 cm. Find the speed of the block when the compression of the spring is 10 cm. The acceleration of gravity is 9.81 m/s^2. Answer in units of m/s.

2007-11-17 11:47:48 · 1 answers · asked by grouchy187 2

2007-11-17 11:33:05 · 14 answers · asked by Jiovanni G 1