Physics - January 2007

Is it 30 or 70 percntage and where can I get proven study information from?

2007-01-24 08:51:52 · 13 answers · asked by Anonymous

A 70 kg box is pulled across a frictionless surface by a 300 N force at an angle of 30 degrees to the horizontal.

a. What is the acceleration of the box in the x-direction?

b. What is the normal force on the box?


Please show work.

2007-01-24 08:48:23 · 2 answers · asked by Amazing Lady 2

A.) Describe at least two similarities between ultraviolet rays and micrwaves.

B.) Describe two diffrences between ultoviolet rays and microwaves.

2007-01-24 08:37:19 · 4 answers · asked by krysdizzle_2006 1

and an intital kinetic energy of
1.98 × 103 kJ. What is the muzzle velocity of the tank's gun (m/s2) ?



The density of uranium is 18.95 g/cm3

2007-01-24 08:33:25 · 2 answers · asked by Anonymous

how far in terms of wavelength does a wave travel in 1 peroid

2007-01-24 08:29:54 · 3 answers · asked by kobay 2

while watching ocean waves at the dock of the bay, Otis notices that 10 waves pass beneath him in 30sec. he also notice that the crests of successive waves exactly coinade with the past that are 5meters apart. What are the peroid,frequency,wavelength, and speed of the ocean wave.

2007-01-24 08:28:17 · 2 answers · asked by kobay 2

2007-01-24 08:15:16 · 26 answers · asked by Seungyong W 5

A 7 kg block being pulled across a table by a horizontal force of 40 N also experiences a frictional force of 10 N. What is the acceleration of the block?
m/s2

2007-01-24 08:08:23 · 2 answers · asked by bibun 2

At a given instant in time, a 3 kg rock is observed to be falling with an acceleration of 5.0 m/s2. What is the magnitude of the force of air resistance acting on the rock? (Use g = 10 m/s2.)
N

2007-01-24 08:06:54 · 1 answers · asked by bibun 2

2007-01-24 07:46:29 · 4 answers · asked by Anonymous

I have to do lab to prove Newton's first law of motion.
materials :
1 toy car
1toy person hwo fits in the car
flat wood board
1 piece of string
6 science text books
1 ruler.
I need to use this these materials to prove Newton's first law og motion???

what do i have to do??? i mean (Procedure)???

please help me . it's due tommorow and I don't know how to do it???

2007-01-24 07:42:47 · 5 answers · asked by Anonymous

2007-01-24 07:41:28 · 23 answers · asked by zeroinfinity121 1

12. Which of the following electronic configurations is not allowed by the Pauli Principle?
a)1 s2 2 s1 2 p1
b)1 s2 2 s1 2 p5
c)1 s2 2 s1 2 p7
d)1 s2 2 s1 2 p6 3 s1




14. Which of the following is wrong?
a)Through sp2 and sp3 hybridizations a carbon atom can make three or four bonds with its neighbors, forming graphite and diamond, respectively.
b)Electrons in molecular bonds do not obey the Pauli Principle.
c)In a two dimensional periodic lattice there can only be 2, 3, 4 or 6-fold symmetries but not 5-fold symmetries.
d)Chemical properties of an element are determined by the distribution of electrons in the highest occupied energy level. The electrons in this shell are the outermost electrons of the atom.

2007-01-24 07:40:20 · 2 answers · asked by akliniozgurbirak 1

8. In the hydrogen atom the electron does not fall into the proton because of
a)the Uncertainty Principle .
b)the Pauli exclusion principle.
c)Einstein’s famous result E = mc2.
d)Kepler’s laws.


9. The frequencies of light in the absorption lines of hydrogen (Balmer lines) are proportional to the following combination of integer(s) n (and n’):
a)n
b) n2
c)1 / n2 - 1 / n’ 2
d)n2 - n’ 2


10. Which is correct?
a)Infrared radiation and ultraviolet radiation both have the same wavelength.
b)Infrared radiation and ultraviolet radiation both have the same frequency.
c)Infrared radiation and gamma rays both have the same velocity.
d)Infrared radiation and gamma rays both have the same period.


11. A particle moving with constant speed on an ellipse
a)has constant velocity.
b)has no acceleration.
c)has changing (time dependent) kinetic energy.
d) has acceleration.

2007-01-24 07:39:46 · 2 answers · asked by akliniozgurbirak 1

2007-01-24 07:10:33 · 5 answers · asked by J-Dog 2

2007-01-24 06:59:10 · 3 answers · asked by Anonymous

the previous needed force was 60N, and it's needed to stretch the expanders by 30 cm.

2007-01-24 06:22:36 · 1 answers · asked by Anonymous

we have those long fluorescent light bulbs in our office and our boss claims that is why it's so hot in here. could he be right?

2007-01-24 06:09:43 · 4 answers · asked by MK 2

2007-01-24 05:41:57 · 1 answers · asked by Anonymous

One type of home coffee grinder has a small blade that rotates very rapidly and cuts the coffee beans into powder nothing prevents the coffee beans form moving so why dont they get out of the way when the blade begins to push on them?

2007-01-24 05:30:03 · 4 answers · asked by Yarka 1

An unseatbelted driver can be injured by the steering weel during a head on collision. Why does the driver hit the steering wheel when the car suddenly comes to a stop?

2007-01-24 05:26:57 · 2 answers · asked by Yarka 1

we know that when somethin travels at the speed of light so many changes start to take place.... things like length contraction, time dilation etc.
And if i traveled by you at the speed of light u wouldnt even notice;.....

I was just wondering that light is made of photons..... and these photons travel at speed c. And we all have a feeling for what light 'looks like' .
what would we observe if light traveled at a lower speed? say just about 20% speed c !
Would the nature of photons change? Would light be something different?

2007-01-24 05:25:27 · 5 answers · asked by sh 1

what is the net force of (a) the first car, (b)the middle car, and (c)the last car of a metro traveling at constant velocity?

2007-01-24 05:23:55 · 2 answers · asked by Yarka 1

2007-01-24 05:14:40 · 8 answers · asked by Yarka 1

the elctric shocker is from a bbq grill lighter (the long gun looking lighter) how do i shock my self and other together? please be specific!

2007-01-24 04:53:37 · 8 answers · asked by corvettedanger2006 1

i need an answer for my physics homework please help xox

2007-01-24 04:51:03 · 11 answers · asked by bbz xox 1

Out of a group of 23 randomly selected people, what is the probability that atleast two were born on the same day?

2007-01-24 04:26:11 · 5 answers · asked by viv_1612 1

2007-01-24 03:56:22 · 8 answers · asked by Anonymous

2007-01-24 03:39:32 · 5 answers · asked by Pastor Biker 6

_____ m/s

2007-01-24 03:34:52 · 3 answers · asked by Khoi 1