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April 18, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics.
see the problem about the dike. use cross-sectional area 1m^2 in your calcs.
Thursday, March 27, 2014 at 3:54pm

Physics.
Your teach is too easy. What is the weight of a column of water of area .6cm^2 1.4 meters high? Weight= volume*density*g = .60cm(1m/100cm)^2* 1.4m*1E6kg/m^3*9.8N/kg= =.6*EE-4*1.4*1EE6*9.8
Thursday, March 27, 2014 at 3:53pm

Physics.
A dike in Holland springs a leak through a hole of area 0.60cm2 at a depth of 1.4m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak? Express your answer to two significant figures and include the appropriate units.
Thursday, March 27, 2014 at 3:33pm

Physics
Calculate the average force per nail when Sarah (following figure), who weighs 130 pounds, lies on a bed of nails and is supported by 600 nails. Express your answer using two significant figures.
Thursday, March 27, 2014 at 3:32pm

Physics.
The top floor of a building is 40m above the basement. Calculate how much greater the water pressure is in the basement than on the top floor. Express your answer to two significant figures and include the appropriate units.
Thursday, March 27, 2014 at 3:31pm

Physics.
Calculate the water pressure at the base of the Hoover Dam. The depth of water behind the dam is 220m . Express your answer to two significant figures and include the appropriate units.
Thursday, March 27, 2014 at 3:30pm

Physics
Pressure = weight density × depth Calculate the water pressure at the bottom of the 50-m-high water tower shown in the photo. Express your answer to two significant figures and include the appropriate units
Thursday, March 27, 2014 at 3:29pm

physics
m1 = 40.4 x1 = 0.00 y1 = .403 m2 = 15.2 x2 = .158 y2 = 0.00 m3 = 9.49 x3 = 0.48 y3 = -.210 m = 65.09 kg x cg = [40.4*0+15.2*.158+9.49*.48]/65.09 = 0.107 m y cg =[40.4*.403+15.2*0+9.49*-.21]/65.09 = 0.22 m
Thursday, March 27, 2014 at 2:21pm

physics
m=M/10^30 4.19*1.75 = m*(7.78-1.75) = m * 6.03 so m = 1.22 so m = 1.22 * 10^30 kg
Thursday, March 27, 2014 at 2:10pm

physics
For the purposes of this problem, there are three parts to the figure, and the center of mass of each one is shown in the drawing. These parts are: (1) the torso, neck, and head (total mass = 40.4 kg) with a center of mass located on the y axis at a point 0.403 m above the ...
Thursday, March 27, 2014 at 2:00pm

physics
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.78x1011 m apart. The larger of the two stars has a mass of 4.19x1030 kg, and its center is 1.75x1011 m from the system's center of mass. What is the mass of the smaller star?
Thursday, March 27, 2014 at 1:58pm

physics
77.1 v = .0593 (.263) v = .000202 m/s better look fast because that blood circles around again in the body, reversing momentum :)
Thursday, March 27, 2014 at 1:52pm

physics
initial momentum = .00626*344 = 2.15 2.15 = .00626 Vb1 + 1.205*.673 Vb1 = 214 m/s exiting first block bullet momentum entering second = .00626*214 = 1.34 1.34 = 1.584 v v = .846 m/s (a) (b)final = (1/2)(1.584)(.846^2) = .567 Joules initial = (1/2)(.00626)(344)^2 =370 ratio = ....
Thursday, March 27, 2014 at 1:47pm

physics
A 6.26-g bullet is moving horizontally with a velocity of +344 m/s, where the sign + indicates that it is moving to the right (see part a of the drawing). The bullet is approaching two blocks resting on a horizontal frictionless surface. Air resistance is negligible. The ...
Thursday, March 27, 2014 at 1:35pm

physics
The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.0430 kg and is moving along the x axis with a velocity of +5.41 m/s. It makes a collision with puck B, which has a mass of 0.0860 kg and is initially at rest. The collision is not ...
Thursday, March 27, 2014 at 1:32pm

physics
For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air Because of the air jets, the friction impeding the horizontal motion of the platform is negligible. Each time the heart beats, blood is pushed out of the heart in a ...
Thursday, March 27, 2014 at 1:31pm

physics
ggg
Thursday, March 27, 2014 at 1:25pm

Physics
negligible :) F = G M1 M2 / d^2 F = 6.67 * 10^-11 * 443 * 356 /11.56 F = 91,000 *10^-11 = 9.1 *10^-7 Newtons
Thursday, March 27, 2014 at 1:15pm

Physics
Object A has a mass of 443 kg. Object B has a mass of 356 kg. If they are separated by 3.4 m, what is the magnitude of the gravitational force between them?
Thursday, March 27, 2014 at 12:39pm

physics
A weight oscillates in a vertical motion according to the position function y(t)=-5cos t. Assuming t>=0 (greater than or equal to), when will the acceleration of the weight be zero for the first time?
Thursday, March 27, 2014 at 12:13pm

physics
F = 9*10^9 Q1 Q2 /.16
Thursday, March 27, 2014 at 12:00pm

physics
calculate the magnitude of the electrical force between object a with a chaarge of 15mc and object b with a charge of 3mcc. they are located 0.4m apart.
Thursday, March 27, 2014 at 11:57am

physics
1760
Thursday, March 27, 2014 at 9:44am

physics
v = Vi -7.1 t 0 = 43 - 7.1 t t = 43/7.1 = 6.06 s average speed during stop = 7.1 /2 =3.55 m/s d = 3.55 * 6.06 = 21.5 m
Thursday, March 27, 2014 at 3:36am

physics
potential energy of each at start = k q^2/r at large distance that energy is kinetic so (1/2)m v^2 = k q^2/r
Thursday, March 27, 2014 at 3:32am

Physics Help
Pairs of forces probably refers to Newton's third law, for every force there is an equal and opposite force.
Thursday, March 27, 2014 at 3:27am

Physics Help
Impulse is mass times change in velocity because Force * time = change of momentum = change of m v = m * change of v if m is constant
Thursday, March 27, 2014 at 3:26am

physics
a car traveling at 43m/s decelerates at a rate of 7.1 m/s squared. how long did it take the car to stop? what distance did the car travel while stopping?
Thursday, March 27, 2014 at 2:29am

Physics Help
It starts saying that impulse is related to velocity in a certain way. What is that relationship? I just said impulse = force x time and momentum = mass x velocity So would that be a correct answer to what they're wanting? Also, it says there is a relationship to be found ...
Thursday, March 27, 2014 at 1:28am

physics
Ingrid: 2h, 21min, 06s = Blake-: 2h, 06min, 50s = 2h, 20min, 66s 2h, 06min, 50s Diff. = 14min, 16s. = = 14.267min = Blake's winning margin. Tb = 120 + 6 + 50/60 = 126.833min = Blake's time. Vb = d/Tb = 42,195m/126.833min = 332.681 m/min = Blake's speed. d = 332....
Thursday, March 27, 2014 at 12:27am

physics
Two electrons start at rest with a seperation of 5e-12 metres. Once released, the electrons accerelate away from each other. Calculate the speed of each electron when they are a very large distance apart.
Thursday, March 27, 2014 at 12:25am

science- Physics
Two electrons start at rest with a seperation of 5e-12 metres. Once released, the electrons accerelate away from each other. Calculate the speed of each electron when they are a very large distance apart.
Thursday, March 27, 2014 at 12:24am

physics
At some point in the combustion cycle of an engine, the temperature of a combusted air-fuel mixture is 582 degrees Celsius. Given that the pressure in the mixture is 6.2 bar, determine the density of the mixture (in kilogram per cubic metre).
Thursday, March 27, 2014 at 12:10am

physics
First you need to figure how much helium is the balloons. Each balloon's lift is reduced by the weight of the helium inside. Once you know how much each balloon weighs, subtract that from the lifting power of the displaced air, which is 1.225kg * .01716 * 9.8N/kg, since ...
Thursday, March 27, 2014 at 12:08am

physics
A typical volume of a modern hot air balloon is 2500 cubic metres, and a typical maximum temperature of the hot air is 120 degrees Celsius. Given these figures, and an outside air temperature and density of 15 \(^{\circ}C\) and 1.225 \(kg/m^3\) respectively, compute the ...
Thursday, March 27, 2014 at 12:04am

physics
Suppose that, on a day when the outside temperature is 15 degrees Celsius, we fill a balloon with pure nitrogen gas, of which the molar mass is 28 grams per mole. Now suppose that we want to heat up a second (equally large) balloon containing air, such that it generates the ...
Thursday, March 27, 2014 at 12:02am

physics
Some say that the hot air balloons with which the Montgolfier brothers performed their first flight had a volume of 1700 cubic metres and could lift 780 kilograms (that includes the balloon, basket and payload). Assume that the balloon took off on a day when the sea level ...
Thursday, March 27, 2014 at 12:00am

physics
Suppose that a party balloon is spherical, has a radius of 16 centimetres and is filled with helium. Furthermore suppose that we do our experiment under standard atmospheric conditions, when the air density is \(\rho = 1.225 kg/m^3\). How many of these balloons should a 75 ...
Wednesday, March 26, 2014 at 11:59pm

physics
Others say that the balloon was 23 metres high and 14 metres wide. Calculate the temperature of the air in the balloon (in degrees Celsius) for this situation as well
Wednesday, March 26, 2014 at 11:56pm

physics
what is the final temperature when 3 pound of water at 100 degree fahrenheit is added to 500 lb at 40 degree fahrenheit
Wednesday, March 26, 2014 at 10:19pm

physics
See Related Questions: Fri,3-21-14,8:55 PM.
Wednesday, March 26, 2014 at 10:10pm

Physics
m*g = 115 * 9.8 = 1127 N. = Wt. of box. Fn = 1127*cos46 = 782.9 N. = Normal force.
Wednesday, March 26, 2014 at 10:05pm

Physics
Correction: F*cosA-Fp = m*a F*cos46-810.7 = m*0 = 0 F*cos46 = 810.7 F = 1167 N.
Wednesday, March 26, 2014 at 9:48pm

physics
force to move block=mu*m2*g force*time=massball(2v) v=force*time/2*massball= = mu*m2*g*t/2m1
Wednesday, March 26, 2014 at 9:19pm

physics
A baseball of mass m1 = 0.32 kg is thrown at a concrete block m2 = 6.25 kg. The block has a coefficient of static friction of μs = 0.71 between it and the floor. The ball is in contact with the block for t = 0.195 s while it collides elastically. What is the minimum ...
Wednesday, March 26, 2014 at 9:00pm

physics
96ft/s
Wednesday, March 26, 2014 at 8:46pm

physics
Circumference = pi*D = 3.14 * 0.7m = 2.20 m. b. Va = 2m/s * 6.28rad/2.20m=5.71 rad/s = Angular velocity.
Wednesday, March 26, 2014 at 8:41pm

Physics
a.) P=P initial + pgh 101,000 Pa + (1000)(9.8)(2.5) P=125500Pa. P=F/A 125500=F/50 6.3*10^6N
Wednesday, March 26, 2014 at 8:01pm

physics
h = (V^2-Vo^2)/2g = (0-(8^2))/-19.6 = 3.27 m.
Wednesday, March 26, 2014 at 7:57pm

physics
A car moving with an initial speed v collides with a second stationary car that is 50.7 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 33.2 percent of the original speed. Calculate the final speed of the second ...
Wednesday, March 26, 2014 at 7:48pm

physics
d = 0.5g*t^2 = 20-12 = 8 m. 4.9t^2 = 8 t^2 = 1.63 t = 1.28 s. = Fall time. Range = V*t = 4m/s * 1.28s = 5.12 m. 5.12m > 5 m. Therefore, he will make it.
Wednesday, March 26, 2014 at 7:34pm

physics
Cock
Wednesday, March 26, 2014 at 6:14pm

physics
weightlarge/areaLarge=weightsmall/areaSm​all weght small= forcesmall=weightlarge*areaSmall/areaLar​ge
Wednesday, March 26, 2014 at 6:07pm

physics
21.74
Wednesday, March 26, 2014 at 5:51pm

physics
The small piston of a hydraulic lift has an area of 0.10 m2. A car weighing 2.0 x 104 N sits on a rack mounted on the large piston. The large piston has an area of 0.50 m2. How large a force must be applied to the small piston to support the car?
Wednesday, March 26, 2014 at 5:31pm

Physics
D(mercury)*P(mercury)=D(liquid)*h(liquid​) a)13.5*38=1*h do rest like this to
Wednesday, March 26, 2014 at 5:01pm

Physics 121 HW
0.283
Wednesday, March 26, 2014 at 3:34pm

physics
not sure just what you're after, but current in a conductor can cause it to heat, changing the resistance. Ohm's Law says I = E/R, and assumes a constant value for R. Heating may alter this, though at any instant the relation still holds, if the changing R is taken ...
Wednesday, March 26, 2014 at 1:39pm

physics
A simple pendulum consists of a small object of mass 1.2 kg hanging at the end of a 2.07 m long light string that is connected to a pivot point. Calculate the magnitude of the torque (due to the force of gravity) about this pivot point when the string makes an angle of 6.59 ...
Wednesday, March 26, 2014 at 1:35pm

I need help with Physics
A baseball of mass m1 = 0.46 kg is thrown at a concrete block m2 = 8.25 kg. The block has a coefficient of static friction of μs = 0.81 between it and the floor. The ball is in contact with the block for t = 0.165 s while it collides elastically. m1 = 0.46 kg m2 = 8.25 ...
Wednesday, March 26, 2014 at 1:18pm

physics
f u
Wednesday, March 26, 2014 at 1:08pm

physics
fff
Wednesday, March 26, 2014 at 1:08pm

Physics
suppose that you drop the ball from a height of about 2m above the floor, releasing it from rest. on the axes that follow, sketch your predictions for the velocity-time and acceleration-time graphs of the ball's motion. assume that the positive y direction is upward
Wednesday, March 26, 2014 at 12:14pm

AP Physics
The answer is 5
Wednesday, March 26, 2014 at 11:36am

AP Physics
5
Wednesday, March 26, 2014 at 11:35am

physics!!!!!
Ac = v^2/R at bottom T = tension in rope T = m g + m v^2/R 28 = 1.8(9.81) + 1.8 v^2/1.55 10.34 = 1.16 v^2 v = 2.98 m/s at top if T = 0 then g = v^2/R 9.81 = v^2/1.55 v = 3.9 m/s
Wednesday, March 26, 2014 at 10:48am

physics
h = (1/2) g t^2
Wednesday, March 26, 2014 at 10:30am

physics
How long will it take a watch dropped from a bridge (20.3 meters above the water) to hit the water?
Wednesday, March 26, 2014 at 9:58am

MOUAU(physics)
F̶̲̥̅̊o̲&#​803;̥я̲̣̥ a metallic conductor,Ohm's law holds provided
Wednesday, March 26, 2014 at 9:48am

physics
no motion in direction of force ----> no work done
Wednesday, March 26, 2014 at 6:31am

Physics
A 20kg box is pulled by a horizontal wire on a circle on rough horizontal for which the coefficient on the kinetic is 0.350.calculate the work down by friction during one complete circle trip if the radiudis 3m.
Wednesday, March 26, 2014 at 5:42am

physics
A stone of mass m kg is held h metres above the floor 50s.The workdone in joules over this period is
Wednesday, March 26, 2014 at 5:39am

physics
839
Wednesday, March 26, 2014 at 4:13am

Physics
,,,,,,
Wednesday, March 26, 2014 at 3:43am

college physics
A 0.240-kg billiard ball that is moving at 3.00 m/s strikes the bumper of a pool table and bounces straight back at 2.40 m/s (80% of its original speed). The collision lasts 0.0150 s. (a) Calculate the average force exerted on the ball by the bumper. (b) How much kinetic ...
Wednesday, March 26, 2014 at 2:32am

college physics
Competitive divers pull their limbs in and curl up their bodies when they do flips. Just before entering the water, they fully extend their limbs to enter straight down. Explain the effect of both actions on their angular velocities. Also explain the effect on their angular ...
Wednesday, March 26, 2014 at 1:48am

physics
What force should the woman in Figure 9.45 exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed.
Wednesday, March 26, 2014 at 12:38am

Physics
23
Tuesday, March 25, 2014 at 11:54pm

Physics
6.0 N = (0.00,6.00) 4.0 NE = (2.83,2.83) 2.0 N25E = (0.85,1.81) 4.0 E = (4.00,0.00) Now just add 'em up and convert back to distance and heading
Tuesday, March 25, 2014 at 11:40pm

Physics
Add the vectors 1. 6.0m N and 4.0 NE 2. 6.0m N25E and 4.0 E
Tuesday, March 25, 2014 at 10:53pm

Physics
A car moving at a constant speed of 50km/h turns a corner, changing it's direction from north to west. What is it's change in velocity. What was the acceleration if the then took 5s
Tuesday, March 25, 2014 at 10:51pm

physics!!!!!
A bucket of mass 1.80kg is whirled in a vertical circle of radius 1.55m . At the lowest point of its motion the tension in the rope supporting the bucket is 28.0N. A-find the speed of the bucket. B-How fast must the bucket move at the top of the circle so that the rope does ...
Tuesday, March 25, 2014 at 10:35pm

Physics
Thanks for taking a look! A baseball of mass m1 = 0.46 kg is thrown at a concrete block m2 = 8.25 kg. The block has a coefficient of static friction of μs = 0.81 between it and the floor. The ball is in contact with the block for t = 0.165 s while it collides elastically...
Tuesday, March 25, 2014 at 10:32pm

physics
hey stfu drwls answer the f u cking question you d ip shi t
Tuesday, March 25, 2014 at 10:26pm

physics
you need a longer schlong pls
Tuesday, March 25, 2014 at 10:26pm

physics
See Related Questions:Fri,3-21-14,8:55PM
Tuesday, March 25, 2014 at 10:02pm

Physics
Vo = 50m/s[37o] Xo = 50*cos37 = 39.93 m/s. Yo = 50*sin37 = 30.09 m/s. Tr = (Y-Yo)/g = (0-30.09)/-9.8 = 3.07 s = Rise time. Tf = Tr = 3.07 s. = Fall time. T = Tr+Tf = 3.07 + 3.07 = 6.14 s. = Time in air. d = Xo*T = 39.93m/s * 6.14s = 245.2 m. = Total dist. traveled.
Tuesday, March 25, 2014 at 9:51pm

Physics
1. A car decelerates at -3.8 without skidding when coming to rest on a level road. What would be its deceleration if the road is inclined at 9.3° and the car moves uphill? (Asume the same static friction coefficient and the car is on the verge of skidding)
Tuesday, March 25, 2014 at 9:47pm

Physics Please help!
Using the parallel axis theorem, we know that I = I_cm + mr^2, where r is the amount of displacement from the symmetry axis. And we know that for a solid cylinder, I_cm = 1/2(mr^2); Further, for a solid sphere I_cm = 2/5(mr^2) (a) ==> I = 1/2(mr^2) + mr^2 = 3/2(mr^2) = 3/2(...
Tuesday, March 25, 2014 at 9:27pm

Physics
h=(V^2-Vo^2)/2g = (0-(8^2))/-19.6=3.27 m
Tuesday, March 25, 2014 at 8:56pm

Physics
The bulk modulus of a liquid is 4.0 10^10 N/m2. Suppose a volume of 0.6 m3 of the liquid is taken from the surface where the pressure is approximately that of the atmosphere (1.00 10^5 N/m2) and is lowered into a pool of liquid to a depth where the pressure is 2.00 10^7 N/m2. ...
Tuesday, March 25, 2014 at 8:38pm

physics
What is the pressure that is exerted by a box tjat has a dimension of 12cm long and 14cm wide and has a force of gravity on the box of 40N?
Tuesday, March 25, 2014 at 8:36pm

physics
vf^2=vi^2 + 2gd g=-9.8m/s^2, d=.180 m, vi given. mass is not needed.
Tuesday, March 25, 2014 at 8:35pm

Physics
A 150g piece of copper is heated to 100oC. It is then held in the open air for 2 minutes and 31 seconds, and then dropped into a 100g copper calorimeter containing 200g of water at 17oC. If the rate of loss of heat of the copper piece while held in the air is 12.6J/sec, ...
Tuesday, March 25, 2014 at 8:34pm

Physics
Ok, but then how do you find Tf?
Tuesday, March 25, 2014 at 8:34pm

physics
A 100-g toy car is propelled by a compressed spring that starts it moving. The car follows the curved track Show that the final speed of the toy car is 0.687 m/s if its initial speed is 2.00 m/s and it coasts up the frictionless slope, gaining 0.180 m in altitude
Tuesday, March 25, 2014 at 8:33pm

Physics
The sum of the heats gained is zero. heatgainedwater+heatgainedAl=0 86.8*cwater*( Tf-90 )+60*calum*(Tf-25)=0
Tuesday, March 25, 2014 at 8:31pm

Physics
An aluminum calorimeter has a mass of 60g and an initial temperature of 25oC. What is the final temperature attained when 86.8g of water at 90oC is poured into it?
Tuesday, March 25, 2014 at 8:24pm

physics
V = d/t = (t^3-3t^2+2)/4=(4^3-3*4^2+2)/4 = 4.5 m/s.
Tuesday, March 25, 2014 at 8:08pm

Physics
Been there, done that scroll down .
Tuesday, March 25, 2014 at 7:59pm

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