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April 16, 2014

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Recent Homework Questions About Physics

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Physics
nigga
Thursday, February 6, 2014 at 1:59am

Physics
A small rock is thrown vertically upward with a speed of 17.0m/s from the edge of the roof of a 32.0m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. What is the speed of the rock just ...
Thursday, February 6, 2014 at 1:38am

Physics
A small rock is thrown vertically upward with a speed of 17.0m/s from the edge of the roof of a 32.0m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. What is the speed of the rock just ...
Thursday, February 6, 2014 at 1:37am

Physics
What is the weight of a 22.0 kg mass at the equator on the surface of Saturn? The mass of Saturn is 5.69 x 10^26 kg and the radius of Saturn is 6.03 x 10^7 m I tried this one using the equation : Fg= Gm1m2/r^2 Fg= (6.67 x 10^-11)(22.0kg)(5.69 x 10^26kg) / (6.03 x 10^7m)^2 I ...
Wednesday, February 5, 2014 at 11:54pm

Physics
You can use any coordinate system you like in order to solve a projectile motion problem. To demonstrate the truth of this statement, consider a ball thrown off the top of a building with a velocity v at an angle θ with respect to the horizontal. Let the building be 49.0 ...
Wednesday, February 5, 2014 at 11:17pm

Physics
You can use any coordinate system you like in order to solve a projectile motion problem. To demonstrate the truth of this statement, consider a ball thrown off the top of a building with a velocity v at an angle θ with respect to the horizontal. Let the building be 49.0 ...
Wednesday, February 5, 2014 at 11:09pm

physics
in a modern nonlinear dynamic experiment, small beads are vibrated on a plate; when the beads start to move, interesting patterns form. If the plate vibrates at 250 hz, for what amplitude of motion will the bears start to lift off?
Wednesday, February 5, 2014 at 11:04pm

Physics
A speedboat increases in speed from 21 m/s to 30.9 m/s in a distance 191 m. a)Find the magnitude of its acceleration. Answer in units of m/s^2. b)Find the time it takes the boat to travel this distance. Answer in units of s.
Wednesday, February 5, 2014 at 10:20pm

Physics
et agfadg
Wednesday, February 5, 2014 at 10:08pm

physics
X = -3.0km Y = 2km Tan Ar = Y/X = 2/-3 = -0.66667 Ar = -33.69o = Reference angle. A = -33.69 + 180 = 146.3o, CCW. D=X/cos A = -3/cos146.3=3.61km[146.3o]
Wednesday, February 5, 2014 at 9:49pm

Physics
all wrong answers
Wednesday, February 5, 2014 at 9:31pm

physics
X = -200 N. Y = -150 N. Fn = sqrt((-200)^2 + (-150)^2) = 250 N.
Wednesday, February 5, 2014 at 9:29pm

Physics
Vo = 15m/s[35o] Yo = 15*sin35 = 8.60 m/s.
Wednesday, February 5, 2014 at 9:00pm

physics
d = 5050m/s * 0.0944s = 476.7 m. 476.7/91.4 = 5.22 Football fields.
Wednesday, February 5, 2014 at 8:48pm

Physics
d
Wednesday, February 5, 2014 at 8:38pm

Physics
e no
Wednesday, February 5, 2014 at 8:08pm

physics (clear answer)
50 m/s^2 * 6s = 300 m/s v = 400j + 300i speed = 500
Wednesday, February 5, 2014 at 7:59pm

physics
5. A charge of -5.00 nC and a charge of -2.00 nC are separated by a distance of 40.0 cm. Find the equilibrium position (where the net force equals zero) for a third charge of 15.0 nC.
Wednesday, February 5, 2014 at 7:56pm

Physics
a=(V-Vo)/t = (6.20-12.2)/6.70=-0.896 m/s^2.
Wednesday, February 5, 2014 at 7:35pm

physics
draw the figure. there are two forces operating on the mass, mg downward, and a pushing force horizontal. Resolve both of those into components up /down the wedge surface. mg resolves down the wedge as mgSinTheta downward the pushing force has an equal and opposite force (...
Wednesday, February 5, 2014 at 7:26pm

physics
See previous post.
Wednesday, February 5, 2014 at 7:19pm

physics
I need to know the angles.
Wednesday, February 5, 2014 at 7:17pm

physics
See previous post.
Wednesday, February 5, 2014 at 7:11pm

Physics
See previous post: Mon,2-3-14,5:42 PM.
Wednesday, February 5, 2014 at 7:08pm

physics
A 2.0 kg mass rests on a frictionless wedge that has an acceleration of 15 m/s2 to the right. The mass remains stationary relative to the wedge, moving neither higher nor lower. (a) What is the angle of inclination, θ, of the wedge, i.e., the angle between the inclined ...
Wednesday, February 5, 2014 at 7:04pm

physics
You have designed a rocket to be used to sample the local atmosphere for pollution. It is fired vertically with a constant upward acceleration of 15 m/s2. After 21 s, the engine shuts off and the rocket continues rising (in freefall) for a while. (Neglect any effects due to ...
Wednesday, February 5, 2014 at 6:54pm

Physics
A football is kicked at ground level with a speed of 17.9m/s at an angle of 39.0∘ to the horizontal. How much later does it hit the ground?
Wednesday, February 5, 2014 at 6:49pm

Physics
A 500.0 kg object is attached by a rope through a pulley to a paddle-wheel shaft that is placed in a well-insulated tank holding 25.0 kg of water. The object is allowed to fall, causing the paddle wheel to rotate, churning the water. If the object falls a vertical distance of ...
Wednesday, February 5, 2014 at 6:26pm

physics (clear answer)
An airplane traveling north at 400 m/s is accelerated due east at a rate of 50 m/s2 for 6 s. If the effects of air resistance and gravity are ignored, what is the final speed of the plane?
Wednesday, February 5, 2014 at 6:23pm

physics
A 101.6-N bird feeder is supported by three cables as shown in the figure below. Find the tension in each cable
Wednesday, February 5, 2014 at 6:22pm

physics
you are driving up a long, inclined road . after 1.20 mi you notice that signs along the roadside indicate that your elevation has increased by 550 ft.
Wednesday, February 5, 2014 at 6:20pm

Physics
What is the temperature increase of water per kilogram at the bottom of a 145 m waterfall if all of the initial potential energy is transferred as heat to the water?
Wednesday, February 5, 2014 at 6:18pm

physics
no diagram. no info on initial height (hi) of ball figure that out and we have h(x) = hi + x - 9.8/100 x^2 solve for x when h = 1.5
Wednesday, February 5, 2014 at 6:18pm

Physics
A 3.00 gram lead bullet travels at a speed of 240 m/s and hits a wooden post. If half the heat energy generated remain with the bullet, what is the increase in temperature of the embedded bullet? (clead = 128 J/kg C)
Wednesday, February 5, 2014 at 6:16pm

physics
Two boxes are connected by a cord running over a pulley as shown in the picture below. Box I of mass 8.0 kg is on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg. What is the tension in the cord? 35 N ...
Wednesday, February 5, 2014 at 6:10pm

physics
As a rock of mass 3.0 kg drops from the edge of a 60. meter high cliff, it experiences air resistance, whose average strength during the fall is 22. N. At what speed will the rock hit the ground? Answer 1.5 m/s 13 m/s 18 m/s 26 m/s 34 m/s
Wednesday, February 5, 2014 at 6:10pm

physics
A 15.0-kg box is released from rest on a rough inclined plane tilted at an angle of 45° to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200. What is the force of kinetic friction on the box? Answer Fifteen square root of ...
Wednesday, February 5, 2014 at 6:07pm

Physics
Where do you get the 14.4*10^16 from?
Wednesday, February 5, 2014 at 5:56pm

physics
F = 100 cos 30 = 86.6 N = 100 (sqrt 3)/2 a = F/m = 86.6/40 = 2.17 m/s^2 =(100/80)sqrt 3 = (5/4) sqrt 3 m/s^2 so five square roots of three all over four meters per second squared
Wednesday, February 5, 2014 at 5:52pm

Physics
120 - 82 = 38 newtons to LEFT F = m a 38 = 75 a a = 0.507 m/s^2 to the left
Wednesday, February 5, 2014 at 5:46pm

Physics
delta x = .05 *10^-9 m delta x * delta p = (1/2) hbar = .5*10^-34 delta p = (.5*10^-34)/.05*10^-9) = 10 * 10^-25 kg m/s mass of electron * delta v = 10*-24 delta v = (10*10^-25)/(9*10^-31) delta v = 1.1 * 10^6 m/s
Wednesday, February 5, 2014 at 5:42pm

physics
A basketball is launched with an initial speed of 10.0 m/s and follows the trajectory shown. The height of the basket y= 1.50m.From what distance x the ball is shot? Note: The drawing is not to scale. Angle is 45degrees
Wednesday, February 5, 2014 at 5:40pm

physics
A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +5.2 m/s and ax = +5.9 m/s2. The y components of the puck's initial velocity and acceleration are ...
Wednesday, February 5, 2014 at 5:36pm

physics
T = 1/f = (1/8)*10^-6 = .125*10^-6 s = .126 microseconds .6/.125 = 4.8 about 5
Wednesday, February 5, 2014 at 5:27pm

Physics
You are pulling a crate across the floor. The crate has a mass of 75.0 kg. You exert a horizontal force of 120. N to the left. Friction exerts a force of 82.0 N to the right. What is the magnitude (fill in box) and direction of the acceleration of the crate?
Wednesday, February 5, 2014 at 5:26pm

physics
A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 30° above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box? Square root of three meters per second squared. Four square ...
Wednesday, February 5, 2014 at 5:25pm

physics
Huh, speed of sound not normally a function of frequency
Wednesday, February 5, 2014 at 5:24pm

physics
This is why I asked what medium. You need speed of sound which is five times faster in water than in air. Period = 1/f wavelength = speed of sound * period
Wednesday, February 5, 2014 at 5:23pm

physics
Oh, ultrasound here is tutorial with this material: https://www.cis.rit.edu/research/ultraso​und/ultrasoundintro/ultraintro.html
Wednesday, February 5, 2014 at 5:21pm

Physics
fall from 18 m, what is speed (1/2) m v^2 = m g h vlaunch = sqrt(2 gh) that is your launch speed for second part optimum launch angle is 45 degrees. so do horizontal and vertical problems u = horizontal velocity = vlaunch/sqrt 2 Vi = initial speed up = vlaunch/sqrt2 distance...
Wednesday, February 5, 2014 at 5:20pm

physics
Hey, are these sonar transducers in water or speakers in air or what? (I am a naval architect - sonar) Spatial pulse length: Length of a pulse from front to back = length of each cycle times the number of cycles in the pulse. Shorter pulse length improves resolution. .1925*5...
Wednesday, February 5, 2014 at 5:15pm

Physics
) What is the minimum uncertainty in the velocity of an electron that is known to be somewhere between 0.050 nm and 0.10 nm from a proton?
Wednesday, February 5, 2014 at 5:06pm

physics
yes 2 *10^-7 = .2 * 10^-6
Wednesday, February 5, 2014 at 5:05pm

Physics
yes
Wednesday, February 5, 2014 at 5:04pm

Physics
31 days (24 hr/day)(3600 s/hr) = 2.68*10^6 seconds circumference of orbit = 2 pi r = 23.9*10^8 so v, speed = 23.9*10^8/(2.68*10^6 = 8.91*10^2 m/s Ac = v^2/r = 79.4 * 10^4 / 3.8*10^8 = 20.9 *10^-4 m/s^2 F = m a G Me m/r^2 = m Ac note m moon cancels 6.67*10^-11 Me/14.4*10^16 =20...
Wednesday, February 5, 2014 at 5:02pm

Physics
I know the formulas, just having problems with the right units. I got 1205 Hz for this one????
Wednesday, February 5, 2014 at 4:59pm

physics
so would it be 0.2 microseconds? I just want to make sure I am understanding it correctly, with the correct units, thanks
Wednesday, February 5, 2014 at 4:57pm

physics
The wavelength of a pulse is 0.1925mm. There are 5 cycles in the pulse. What is the spatial pulse length?
Wednesday, February 5, 2014 at 4:55pm

Physics 1
Vox = 5710 m/s Voy = 7490 m/s a. Hor. acceleration: Vo*t + 0.5a*t^2 = 5.78*10^6 m. 5710*910 + 0.5a*910^2 = 5.78*10^6 5.196*10^6 + 4.14*10^5a = 5.78*10^6 4.14*10^5a = 5.84*10^5 a = 1.41 m/s^2. b. Ver. acceleration: 7490*910 + 0.5a*910^2 = 6.17*10^6 6.816*10^6 + 4.14*10^5a = 6....
Wednesday, February 5, 2014 at 4:55pm

physics
The pulse duration of the transducer is 0.6 microseconds. The frequency of the transducer is 8MHz. How many cycles are contained in that pulse?
Wednesday, February 5, 2014 at 4:54pm

physics
what is the propagation speed of a 5MHz transducer?
Wednesday, February 5, 2014 at 4:53pm

physics
What is the wavelength of a 4MHz transducer?
Wednesday, February 5, 2014 at 4:51pm

physics
If an ultrasound beam at the focal zone has a power of 0.050 watts and the area at this focal zone is 4cm^2, what is the intensity of the beam?
Wednesday, February 5, 2014 at 4:50pm

Physics
If you can throw a stone straight up to a height of 18m, how far could you throw it horizontally over level ground? Assume the same throwing speed and optimum launch angle.
Wednesday, February 5, 2014 at 4:50pm

Physics
LOL f = 1/T
Wednesday, February 5, 2014 at 4:49pm

physics
T = 1/f
Wednesday, February 5, 2014 at 4:49pm

Physics
If the period of a transducer is 0.83msec, what is the HZ?
Wednesday, February 5, 2014 at 4:48pm

physics
If the frequency of a transducer is 5MHz, what is the period?
Wednesday, February 5, 2014 at 4:47pm

physics
T = 2 pi sqrt(L/g) 5 = 2 pi sqrt(L/9.81) L/9.81 = .63326 L = 6.21 meters
Wednesday, February 5, 2014 at 4:47pm

physics
Find the length of a simple pendulum that has a period of 5.00s . Assume g = 9.81 m/s2. Express your answer to three significant figures and include the appropriate units.
Wednesday, February 5, 2014 at 4:41pm

Physics
If the period of the moon were 31 days while its orbit radius 3.8x10^8m, what would the mass of the Earth be?
Wednesday, February 5, 2014 at 3:21pm

physics
PE = F*h = mg*h = 98*10 = 980 Joules.
Wednesday, February 5, 2014 at 3:11pm

Physics 1
d = Vo*t + 0.5g*t^2 = 2 m. 0 + 4.9t^2 = 2 t^2 = 0.408 Tf = 0.639 s. = Fall time. D = 5.0m/s * 0.639s = 3.19 m.
Wednesday, February 5, 2014 at 3:03pm

Physics
Two trains, each having a speed of s, are headed at each other on the same straight track. A bird that can fly at speed 2s flies off the front of one train when they are d apart and heads directly for the other train. On reaching the other train it flies directly back to the ...
Wednesday, February 5, 2014 at 2:10pm

Physics
A particle starts from the origin at t = 0 and moves along the positive x axis. A graph of the velocity of the particle as a function of the time is shown in the figure; the v-axis scale is set by vs = 7.0 m/s. (a) What is the coordinate of the particle at t = 5.0 s? (b) What ...
Wednesday, February 5, 2014 at 2:09pm

physics
A red ball of mass 0,6 kg,travelling at 5 m.s^-1 on a frictionless surface ,stikes a stationary green ball of mass 0,3 kg.after the collision,the red ball continues to move in its original direction at 2m.s^-1,while the green ball moves in front of the red ball. Determine the ...
Wednesday, February 5, 2014 at 1:52pm

physics
thanks for the answer but can i get more explanation
Wednesday, February 5, 2014 at 12:40pm

Physics
thanks for the answer but can i get more explanation
Wednesday, February 5, 2014 at 12:39pm

Physics
thanks for the answer but can i get more explanation
Wednesday, February 5, 2014 at 12:39pm

Physics
thanks for the answer but can i get more explanation
Wednesday, February 5, 2014 at 12:38pm

Physics
thanks for the answer but can i get more explanation
Wednesday, February 5, 2014 at 12:38pm

Physics
thanks for the answer but can i get more explanation
Wednesday, February 5, 2014 at 12:38pm

physics
Bxbd
Wednesday, February 5, 2014 at 10:26am

physics
Dumbass
Wednesday, February 5, 2014 at 10:21am

Physics
How much energy (in MeV) is released in the reaction proton + deuteron goes to 3He + gamma? (You may ignore the initial kinetic energy of the reactants.) For the purposes of this problem, use the following masses (in MeV/c2): Proton: 938.783263054 Neutron: 939.5657182828 ...
Wednesday, February 5, 2014 at 9:58am

Physics
How much energy (in MeV) is released in the reaction proton + deuteron goes to 3He + gamma? (You may ignore the initial kinetic energy of the reactants.) For the purposes of this problem, use the following masses (in MeV/c2): Proton: 938.783263054 Neutron: 939.5657182828 ...
Wednesday, February 5, 2014 at 9:26am

Physics
Consider an interstellar spaceship powered by matter-antimatter reactions. The energy resulting from the matter-antimatter reactions is ejected from the exhaust as electromagnetic radiation producing thrust. The design goal is to have the thrust produce an acceleration equal ...
Wednesday, February 5, 2014 at 9:25am

physics
7/8 part of a substance decays in 45 days what is its half life
Wednesday, February 5, 2014 at 7:44am

Physics
That is an ellipse. I do not know why you are interested in its length along the x axis but ok. x^2/p^2 = (1 - y^2/q^2) p^2 = x^2/(1 - y^2/q^2) p = +/- x / (1-y^2/q^2)^.5 note if y = 0 then x = +/- p =the semi axis of the ellipse
Wednesday, February 5, 2014 at 6:16am

Physics
we have to transpose the following equation to find p, but I dont quite understand how to come up with the correct answer: x^2/p^2 + y^2/q^2 = 1 Appreciate help, thanks
Wednesday, February 5, 2014 at 6:04am

Physics
-0
Wednesday, February 5, 2014 at 5:24am

Physics
A source traveling at 100m/s emits sound waves of frquency 900hz ..what is the velocity of the sound ?
Tuesday, February 4, 2014 at 11:46pm

physics
A constant force of 900 N pushes a 100 kg mass up the inclined plane shown above at a uniform speed of 5 m/s. ( hight= 1m) The power developed by the 900 N force is most nearly: 400 W 800 W 900 W 1000 W 4500 W
Tuesday, February 4, 2014 at 11:46pm

physics
The cart of mass 10 kg shown above moves without frictional loss on a level table. A 30 N force pulls on the cart horizontally to the right. At the same time, a 10 N force at an angle of 60° above the horizontal pulls on the cart to the left. What is the magnitude of the ...
Tuesday, February 4, 2014 at 11:44pm

physics
The two blocks of masses M and 2M shown above initially travel at the same speed v but in opposite directions. They collide and stick together. What is the final velocity of the mass M after the collision? negative one sixth v. negative one third v. Zero one sixth v. one third...
Tuesday, February 4, 2014 at 11:35pm

physics
Two trains face each other on adjacent tracks. They are initially at rest, and their front ends are 34 m apart. The train on the left accelerates rightward at 1.18 m/s2. The train on the right accelerates leftward at 1.19 m/s2. (a) How far does the train on the left travel ...
Tuesday, February 4, 2014 at 11:31pm

physics
The figure above shows an object of mass 0.5 kg that is suspended from a scale and submerged in a liquid. If the reading on the scale is 4 N, then the buoyant force that the fluid exerts on the object is most nearly: 1.3 N 1.0 N 0.75 N 0.33 N 0.25 N
Tuesday, February 4, 2014 at 11:30pm

physics
For which of the following motions of an object must the acceleration always be zero? I. Any motion in a straight line II. Any free fall motion III. Any motion in a circle it can be more than one :P
Tuesday, February 4, 2014 at 11:28pm

physics
If the field strength is E = 9 V/m a distance of 1 m from the charge, what is the field strength E a distance of 3 m from the charge?
Tuesday, February 4, 2014 at 11:13pm

physics
What must the charge (sign and magnitude) of a particle of mass 1.47g be for it to remain stationary when placed in a downward-directed electric field of magnitude 690N/C ? Use 9.81m/s2 for the magnitude of the acceleration due to gravity. PART B What is the magnitude of an ...
Tuesday, February 4, 2014 at 11:13pm

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