129,881 results, page 8

1. ### algebra help

Please help me with this and if you can explain please, okay so i have x-y=0 and x-2y=6 i have to solve by using substitution, at first i though i can replace x-2y=6 with x but then i notice that i can't can i put one of the equations into y=? Please help me with this thank you
2. ### Physics Help Please --- Telescope

An astronomical refracting telescope is made from two lenses. the objective lens has a focal length of 114 cm, and the eyepiece lens has a focal length of 17 cm. a) What is the total length of the telescope? b) What is the angular magnification of the telescope? c) What is the...
3. ### physics(airplane)

Hi, Does anybody know any websites or ideas of how to make an airplane without any paper (cardboard is allowed). Please help.

5. ### physics again!!

An arrow is fired at an angle of 53 with a velocity of 15 m/s. what is its range? explain step by step please!!
6. ### Physics

If 2.0 J of work is done in raising 180 g apple how is it lifted? Please if you answer, do it step by step. Thanks in advance.
7. ### physics

how long does it take a boy to walk 430 m if he walk at a rate of 40 m/hr ? please answer in minutes
8. ### physics

how long does it take a boy to walk 430 m if he walk at a rate of 40 m/hr ? please answer in minutes
9. ### physics

how long does it take a boy to walk 430 m if he walk at a rate of 40 m/hr ? please answer in minutes

A car is traveling at 10 m/s. By what factor does the car's kinetic energy increase if its speed is doubled to 20 m/s?
11. ### Physics

A body of mass m is attracted toward a 10.7 kg mass, 29.7 cm away, with a force of magnitude 6.54 10-8 N. Find m. Please Help!
12. ### physics

Find the tension T2 of the box hanging from the rope if 1 = 25°, 2 = 65°, T1 = 60.58 newtons, and W = 143.4 newtons answer please
13. ### Physics

What are some careers that relate to waves and sound? Can you give some examples of how it's used please?
14. ### Physics

A ship sails north at 15 km/h but drifts westward with the tide at 8 km/h. What is the resultant velocity of the ship? Help me Please

16. ### accelerated 7th grade Lang. Art

please fill in the blank please please there will be a list of words below 1) We need large sums of money tp keep our school system going, but we are getting only a(n)__________________ if funds from the state. List: alight barren disrupt dynasty germinate hurtle interminable ...
17. ### PHYSICS CHECK WORK PLEASE

I am getting the wrong answer. Can you please check my work? My answer is off by a multiple of ten. A sample of an unknown material appears to weigh 295 N in air and 165 N when immersed in alcohol of specific gravity 0.700. (a) What is the volume of the material? ___________m^...
18. ### physiology practical

what affect can happen on the blood pressure and the heart rate when you drag or clamp the common carotid artery of the rabbit? and why? PLEASE please answer fast cause i have presentation tomorrow, please need help urgent!
19. ### it

Can someone please help me with this. I need some understanding on how to 4] Use IPO for analysis [4] Use Pseudo Code to show your design solution. I am not sure how to do this or how or what to do. Please help me better understand this. Please

I need to compare and contrast the architectural details of the Early Christian basilica with those of the Gothic Cathedral. Im searching and searching on google, and i cannot find anything. PLEASE HELP PLEASE.

Express the fractions 1/2, 3/16, and 7/8 with an LCD. A. 1/4, 3/4, 7/4 B. 1/32, 3/32, 7/32 C. 4/8, 6/8, 14/8 D. 8/16, 3/16, 14/16 I think its b, but im really bad at math. can someone please help me out? I have to finish this by 12:15 so I can be on time to volunteer at the ...

Please help me with the following: Find the greatest possible error for each measurement. 4 1/2 oz A. 1/4 oz B. 2 1/2 oz C. 1 oz D. 2 1/4 oz I know it is not B(I got it wrong.), but I think it is A. Is this correct? Please help me by checking my answer. Any help is appreciated...
23. ### Physics/English/Nautical Mile

In my previous posts about the NM I think part of my problem is I do not understand the meaning of the word "SUBTENDED". Explanation please. Mike
24. ### PHYSICS

at the earths surface, a projectile is launched straight up at a speed of 10km/. To what height will it rise? i need some major help here please don't know where to begin on this one!
25. ### physics

Does anyone know what this is about? please help I would be more than grateful.. How does Rutherford’s model of the atom account for the back – scattering of alpha particles directed at the gold leaf
26. ### physics!!

A circuit contains a 12V power source, and a 3ohms, 4ohms, and 6ohms, resistor. How should the resistors be arranged for the current through the battery to be 2A? Please help!THANKS!
27. ### Physics

Show mathematically that a diverging lens will alway produce an upright image. [i.e. prove that hi is positive if f is negative] I'm not even sure how to start this. Can someone please help me?
28. ### Physics

What distance is travelled by a basketball player who accelerates from rest to 5.654x10^0 m/s in 1.567x10^0 seconds, to three significant figures? Can someone please explain how to do the calculations
29. ### Integrated Physics and Chemistry

Which of the following forms of energy transfer can occur in a vacuum? A) conduction B) convection C) radiation D) all of the above Can I get some help on this one too, please?
30. ### Physics

Electrical conductivity in liquid solutions depends on the presence of free 1) neutrons 2) protons 3) molecules 4) ions explain please I really don't understand this question

Determine the final speed assuming that the time elapsed since t=0 is 2.4s. Initial velocity is +12m/s acceleration is +3.4m/s^2 I tryed doing 12/2.4 and then 12/3.4 but both of these were incorrect? I am not sure what to do. Thank you.
32. ### physics

Measure of two quantities along with the precision of respective measuring instrument is A = 2.5 m s–1 ± 0.5 m s–1 B = 0.10 s ± 0.01 s The value of A B will be (a) (0.25 ± 0.08) m (b) (0.25 ± 0.5) m (c) (0.25 ± 0.05) m (d) (0.25 ± 0.135) m please tell me the correct ...
33. ### physics HELP

A block a mass of .113 kg is slid horizontally with a acceleration of 2.612 m/s^2 What is the kinectic force and the coefficient of friction. Please show the steps in getting these answers,
34. ### Physics

In grandpa’s time automobiles were previously manufactured to be as rigid as possible, whereas autos are now designed to crumple upon impact. Why? Please help; Thank you in advance for the help...

37. ### Physics Need help plz

An 1900 kg car is traveling with a speed of (22 +- .22) m/s. With what maximum accuracy can its position be determined? delta x= in meters Can someone please help me out I am lost on this on...Thank you
38. ### Physics Need help plz

An 1900 kg car is traveling with a speed of (22 +- .22) m/s. With what maximum accuracy can its position be determined? delta x= in meters Can someone please help me out I am lost on this on...Thank you
39. ### Physics

William Tell fired an arrow with a velocity of 100 m/s at an angle of 30˚. How long will it take to reach its highest point? Please show work
40. ### physics

From the roof of a 64 metres high building a ball was thrown which is of 5kg mass.how long it takes to reach the ground? Please show the process with answer
41. ### Physics

What resistance must be placed in parallel with a 152 resistor to make the equivalent resistance 111 ? Please help!!!!!
42. ### Physics-lunar

At what time will a full moon rise? Please enter military time in whole hours, ex. 15 for 3 pm.

Derive the rocket equation M(dV/dt) = -u(dM/dt)for a rocket in the (constant) gravitational field near the surface of the Earth.

45. ### physics

Can friction (which causes heating) with the atmosphere ignite the object moving through the atmosphere? Can someone help me with this? Please!
46. ### physics

If a simple machine provides an increased output force, what happens to the output distance? Can someone please help

The de Broglie wavelength of a proton in a particle accelerator is 3.60 x 10^-14 m. Determine the kinetic energy (in joules) of the proton.
48. ### physics

please tell me f(x)=rho_1*g*A the solution of which question I cannot understand plz give the 3 to 4 words of question as a hint

An elephant can hear sound with a frequency of 15.0 Hz. What is the wavelength of this wave? The speed of sound in air is 343 m/s.

An elephant can hear sound with a frequency of 15.0 Hz. What is the wavelength of this wave? The speed of sound in air is 343 m/s.
51. ### physics

steven throws a 3.5kg ball at a speed of 25m/s. what is the momentum of the ball? Please show work
52. ### physics

a car rounds a curve with a radius of 45.0 m at a speed of 22.0 m/s. What is the centripetal acceleration of the car? please show work
53. ### Physics

A ball is thrown straight down with a velocity of 12 m/s; what will be its velocity 2.0 s after being released? Please help me solve this!!
54. ### Physics

how is internal energy of a real gas differs from that of ideal gas? Please write the difference in details

im not really understanding the question can someone please help me. the energy difference between states A and B is twice the energy difference between states B and C (C > B > A). In a transition (quantum jump) from C to B, an electron emits a photon of wavelength 400 ...

57. ### physics

Posted by michelle quendarsv on Saturday, November 20, 2010 at 5:26pm. Posted by michelle quendarsv on Saturday, November 20, 2010 at 3:55pm. if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please...
58. ### physics - so important

In which of these cases is a youngster doing work in the school gymnasium? climbing up a rope lifting a set of weights from the floor to overhead PLEASE HELP ME? i NEED TO KNOW THiS FOR A TEST TOMORROW iN PHYSiCS & i CANT SEEM TO FiND THE ANSWER ANYWHERE & i HAVE SO MANY ...
59. ### ASAP

Could you please show me how to solvethis: x+6/4x^2 + 3/2x^2 = x + 4/2x^2 Please show me the steps-I don't even know where to start and I have 30 of these for homework Thank you

63. ### Health

What are the short term effects of Cocaine: When someone consumes this substance what effect will it have on their body, mind, and behavior? Please answer ASAP I really need the answer... and please don't give the website for me to find the info, I don't have enough time to do...
64. ### physics

A baseball bat hits a ball with an average force of 970N that acts for 0.0088s. a) what impulse was given to the ball/ b)What was the change of momentum of the ball? c)The ball was hit back in the same direction that it came from. If its speed before being hit was 32ms-1, what...
65. ### physics

The pilot of an aircraft wishes to fly due west in a 50.0 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 228 km/h. a) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of degrees. b) What ...
66. ### Physics MCAT, Help please

A box of mass m = 6kg slides with speed v = 4 m/s across a frictionless floor. It suddenly explodes into two pieces. One piece, with mass m1 = 2kg moves in the same direction with speed v1 = 8m/s. Find the velocity of the second piece. Its answer is 2 m/s , but I don't know ...
67. ### PHYSICS

Leg traction is applied to a patient's leg as shown in the figure below. If the physician has requested a 33 N force to be applied to the leg, and the angle is θ = 60 degrees. what mass m must be used for the object hanging from the massless cable? Image of traction: ...
68. ### Physics - Satellites

Why must the centre of the satellite orbit coincide with the centre of the Earth? I'm such a science noob, please help >_<
69. ### Physics capacitance

I know that to solve: f=1 over 2 pi sqrt LC for C, I have to use C= 1 over L(2 pi f)^2 Can someone take me through the rearranging please. Thanks.
70. ### physics

what is the distance traveled by a vehicle in 12 minutes, if it's speed is 35km/h? And the answer I got was 7km but I got it wrong. Please help!
71. ### Physics

"A diver springs upward with an initial speed of 1.8 m/s from a 3.0 m board. Find the velocity with which the diver strikes the water." Help please!
72. ### physics

Sir please let me know that how do we calculate time period of the oscillating rod, t=2pi(2l/3g)^1/2.. & why do we take length 2/3 of the total length??

If a woman lifts a 19.3 kg bucket from a well and does 6.10 kJ of work, how deep is the well? Assume that the speed of the bucket remains constant as it is lifted
74. ### physics

I don't know how to this problem please help. A 10 kg object sits 5 m away from a 50 kg object. Calculate the force of attraction between the two masses
75. ### physics

I don't know how to this problem please help. A 10 kg object sits 5 m away from a 50 kg object. Calculate the force of attraction between the two masses
76. ### physics

A particle's constant acceleration is south at 2.0 m/s2. At t = 0, its velocity is 40.0 m/s east. What is its velocity at t = 7.7 s? Magnitude m/s Direction Please someone help me out on this...Thank you
77. ### physics

how to find the tension in a rope when we know that the weight of the body attached to the rope is 50 newton? if there is a formula for that can you please tell thankyou
78. ### PHYSICS

IF YOU DROP A BALL FROM A HEIGHT OF 2.6M, HOW LONG WILL IT TAKE TO REACH THE GROUND? HOW FAST WILL IT BE GOING WHEN IT HITS THE GROUND? PLEASE HELP.

A ball is dropped from a height of 5.67 m. If the ball rebounds with a speed of 4.22 m/s, what is the coefficient of restitution? a. .40 b. .74 c. .56 d. 1.23 I've ruled d out because it is greater than 1.
80. ### physics please need help

A parallel RL circuit has a reactance of 250 W and a resistance of 125 W. The phase angle of the circuit impedance is

A coffin is given an initial speed of 4.4 m/s up the 17.8º inclined plane with a coefficient of kinetic friction of 0.4. How far up the plane will it go?

A 1.30 kg mass is suspended from a spring, with a spring constant of 135.0 N/m. Find the driving frequency which would cause resonance.
83. ### Physics

Help me with this please When a 20 V battery is hooked up to a 10 Ω resistor in a circuit, how much current flows through the circuit? 0.5 A 2 A 20 A 200 A
84. ### physics

What is the velocity of a baseball thrown 40m from third base to first base in 1.9s? Show your work, and simplify please.
85. ### Physics

Show that the kinetic energy of an object can be written in terms of the momentum as KE = p2/2m. Help ASAP please. Step by step to get the answer

If the abesolute pressur at the bottom of a fresh water pond is 2.313*10^5 PA,what will be the depth of the pond?
87. ### Math (Physics)

What is the resistance of a 3.9-m length of copper wire 1.1 mm in diameter? The resistivity of copper is 1.68×10^−8Ω⋅m. R=______ Ω Please Help. I've been at this for hours.
88. ### physics

A 2000 kg trolley is pulled up a 30 degree hill at 20 km/hr by a winch. How much power is the winch providing? Steps Please!!
89. ### physics

The efficiency of an electric motor is 20 %. When lifting a body 500 J of energy are wasted. What is the useful work done by the motor? please and thank u!
90. ### Physics

X=1/2at^2 Solve for a Solve for t Can you please show me how to do this Thank u

Please help-What is the equation of the ellipse with foci (0,6), (0,-6) and co-vertices (2,0),(-2,0) Please explain the steps because I have 5 to do for homework-Thank you-I'm really stuck on this I thought the answer would be x^2/4 + y^2/40 = 1 but that can't be because the ...
92. ### Algebra II Please check-

Please help-What is the equation of the ellipse with foci (0,6), (0,-6) and co-vertices (2,0),(-2,0) Please explain the steps because I have 5 to do for homework-Thank you-I'm really stuck on this I thought the answer would be x^2/4 + y^2/40 = 1 but that can't be because the ...
93. ### Geography

I need to write about the river tees AND about the source to mouth. Please please help me :( I have to redo do it by monday and I can only use the computer for 30 more minutes! Please F'ing help ME.
94. ### Physics: Non uniform motion

I have not done much physics before: I don't get how to do questions that deal with what happened in a particular SECOND So questions like: - A stone which is dropped from rest into a mine shaft falls a distance of 24.5 m DURING THE LAST SECOND. Find depth of the shaft or - ...
95. ### AP Physics

Two identical, small balls are suspended by separate 0.25m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0 x 10^-4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and, as a ...

Would changing the frequency of a wave cause a change in amplitude? I would say NO because they don't affect each other, correct? If I had a wave diagram will 4 complete waves showing and it said the diagram represented 4 sec in time the frequency would be 1cycle/ per second, ...