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April 18, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
OK, thank you, I understand :)
Monday, February 3, 2014 at 2:08pm

Physics
north momentum = 10 m east momentum = 15 m final mass = 2 m final north v = 10 m/2 m = 5 m/s final east v = 15 m/2 m = 7.5 m/s |v| = sqrt(25+56.25) = 9.1 so yes
Monday, February 3, 2014 at 2:07pm

physics
j
Monday, February 3, 2014 at 2:06pm

Physics
Once again, it is true again and again: Momentum before = momentum after if no EXTERNAL force on system, like here: 0 = 5 v + 3 * 3 v = -9/5 = -1.8
Monday, February 3, 2014 at 2:04pm

Physics
You are welcome.
Monday, February 3, 2014 at 2:01pm

Physics Please check my answers
3. I would say yes assuming g constant, p = rho g h Of course it also depends on velocity and acceleration 4. That is ARCHIMEDES !!!!!!! 5. Pascal did lots of things, but not Archimede's Principle 6, No, no, no !! look up "Bernoulli's principle. 7. is TRUE !!!! ...
Monday, February 3, 2014 at 2:00pm

Physics
Am I correct? Two carts have a compressed spring between them and are initially at rest. One of the carts has total mass, including its contents, of 5.0 kg, and the other has total mass of 3.0 kg. If the 3.0 kg cart is moving at 3.0 m/s after the spring is allowed to push the ...
Monday, February 3, 2014 at 1:58pm

physics help please
o
Monday, February 3, 2014 at 1:56pm

Physics
An aluminum calorimetry cup [mc = 0.6 kg, cc = 0.22 kcal/(kgC)] is filled with water [mw = 2.4 kg, cw = 1 kcal/(kgC)]. It is at a temperature of 30C. A sample of an unknown substance with mass mm = 2.34 kg, originally at a temperature of 210C, is added. After a while, the ...
Monday, February 3, 2014 at 1:54pm

Physics
Thank You :)
Monday, February 3, 2014 at 1:52pm

Physics
momentum before = momentum after 1300 * 2 + 400 * 0 = 1700 v v = 1300 * 2 / 1700 v = 1.5 m/s
Monday, February 3, 2014 at 1:50pm

Physics Please check my answers
1. A fluid can only be a liquid. True << False 2. One atmosphere is equal to 14.7 psi. True << False 3. In a fluid, pressure depends on the density of the fluid and the depth. True False << 4. Pascal's Principle says that the buoyant force on an object ...
Monday, February 3, 2014 at 1:46pm

Physics
Guide me through this plz. A single 1,300 kg cargo train car is rolling along a train track at 2.0 m/s when 400 kg of coal is dropped vertically into it. What is its velocity right afterward? Assume a closed system. (Points : 1) 1.5 m/s 2.0 m/s 6.5 m/s 0.0011 m/s
Monday, February 3, 2014 at 1:42pm

physics
1.10 m - 0.98m = .12 m = 12 cm
Monday, February 3, 2014 at 1:23pm

Physics Please check my answers
Gulp - re-read chapter ! 1. right sure, rolling ball 2. wrong, m r^2 does not change on Moon 3. wrong true, Moment = I alpha is F = m A 4. No, false , cross product perpendicular to both 5. right, vector 6. wrong, true, hinge works on torque (unless the latch is stuck :) 7. ...
Monday, February 3, 2014 at 1:20pm

physics
a year ago she measured 98cm from her tree . now it 1.1m tall how much has it grown
Monday, February 3, 2014 at 1:20pm

physics
TWO BOXES A AND B ARE LYING ON THE TABLE AND ARE CONNECTED BY A PIECE OF STRING. THE MASS OF BOX A IS 3KG AND B IS 2KG. A 10N PULLING FORCE, POINTING TO THE RIGHT IS APPLIED TO BOX X CAUSING THE TWO BOXES TO MOVE TOGETHER AT CONSTA SPEED. a) determine the net force on A & B b...
Monday, February 3, 2014 at 1:12pm

Physics
120
Monday, February 3, 2014 at 1:09pm

Physics
You are welcome. Nasty questions !
Monday, February 3, 2014 at 1:04pm

Physics Please check my answers
It's possible for a body to have both rotational and translational motion at the same time. True. << False. 2. The moment of inertia of an object would be different on the surface of the earth than on the surface of the moon. True. << False. 3. The moment of ...
Monday, February 3, 2014 at 1:01pm

Physics
thanks a lot!
Monday, February 3, 2014 at 12:57pm

physics 1
at t = 0 Vx = 3.5 and Ax = 5.8 so at t = .5 Vx = 3.5 + 5.8*.5 = 6.4 Vy = 2.8 and Ay = -2 so at t = .5 Vy = 2.8 -2*.5 = 1.8 |v| = sqt(6.4^2 + 1.8^2) = 6.65 m/s tan theta = 1.8/6.4 so theta = 15.7 degrees north of east
Monday, February 3, 2014 at 12:39pm

Physics
2. What is the speed of a 0.25kg ball if its kinetic energy is 15 J? my answer: 11m/s (1/2)(.25) * v^2 = 15 v = Yes, about 11 m/s 3. A ball is dropped off a high cliff. What quantity increases as the ball gets closer to the ground? my answer: I'm not too sure. It's ...
Monday, February 3, 2014 at 12:30pm

Physics
I was wondering if my answers are correct. Thanks in advance. 1. A boy pushes down on a car rolling horizontally down the road. The boy pushes down vertically with 10N of force as the car rolls 3.0m horizontally. What work is done? my answer: 30 N•m (or would it be -30N&#...
Monday, February 3, 2014 at 12:16pm

physics 1
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 = +3.5 m/s and ax = +5.8 m/s2. The y components of the puck's initial velocity and acceleration are ...
Monday, February 3, 2014 at 12:14pm

Physics
The acceleration of a particle moving only on a horizontal xy plane is given by , where is in meters per second-squared and t is in seconds. At t = 0, the position vector locates the paticle, which then has the velocity vector . At t = 3.60 s, what are (a) its position vector ...
Monday, February 3, 2014 at 12:10pm

physics
On a calm, bright day, you're scuba diving in a deep lake (n = 1.33), 6.30 m away from your sailboat in the horizontal direction. When you are 2.70 m below the surface, the top of the sailboat mast appears to you to be in a direction 31.0° from vertical...
Monday, February 3, 2014 at 11:30am

physics
On a calm, bright day, you're scuba diving in a deep lake (n = 1.33), 6.30 m away from your sailboat in the horizontal direction. When you are 2.70 m below the surface, the top of the sailboat mast appears to you to be in a direction 31.0° from vertical...
Monday, February 3, 2014 at 11:28am

physics
Two speakers, one directly behind the other, are each generating a 579-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Take the speed of sound to be 344 m/s.
Monday, February 3, 2014 at 11:28am

physics
Suppose that a public address system emits sound uniformly in all directions and that there are no reflections. The intensity at a location 20 m away from the sound source is 3.0 × 10-4 W/m2. What is the intensity at a spot that is 87 m away?
Monday, February 3, 2014 at 11:13am

physics
2sec
Monday, February 3, 2014 at 10:50am

physics?
.
Monday, February 3, 2014 at 10:30am

physics
You are driving down the road and hit a bump which causes your fishing tackle box to bounce out of the bed of your pickup. The box decelerates at a rate of 3 m/s¶ and skids 24 meters before coming to a stop. How fast were you traveling when the box fell out?
Monday, February 3, 2014 at 9:43am

physics
I'm driving along at a constant speed in my 3 metre long car when I notice that I am accidentally driving through a red light. If the rear of my car passes under the light 0.3 seconds after the front of my car, how fast am I driving in m/s?
Monday, February 3, 2014 at 8:16am

physics
need five differences between compounds and molecules...... got only one that is ;A molecule is formed when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements.
Monday, February 3, 2014 at 7:02am

Physics
An alloy of mass 225g is heated to 550C. It is quickly placed in 450g of water at 12C. The water is contained in an aluminum calorimeter cup of mass 210g. The final temperature of mixture is 31.7C. Specific heat of aluminum is 0.215 cal/gC. Find the specific heat of alloy.
Monday, February 3, 2014 at 6:59am

PHYSICS
AGLASS BLOCK WEIGHS 2.5N IN AIR WHEN USUALLY IMMERSED IN WATER THE WEIGHS 15N.CALCULATE APPARENTLOSS IN WATER.
Monday, February 3, 2014 at 5:51am

physics
104 = (1/2)(9.8)t^2 t^2 = 208/9.8 = 21.2 t = 4.67 seconds
Monday, February 3, 2014 at 2:40am

physics
jjj
Monday, February 3, 2014 at 1:14am

physics
so far i have 4.47m distance boat travels y=1/2 at^2 t= /2(-104m)|(-___m/s^2)=? trying to find the time it takes the stone to fall
Sunday, February 2, 2014 at 11:46pm

physics
1
Sunday, February 2, 2014 at 11:42pm

physics
A woman on a bridge 104 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 9.78 m more to travel before passing under the bridge. The stone hits the water 5.31 m...
Sunday, February 2, 2014 at 11:41pm

Physics
A test rocket is launched by accelerating it along a 200.0-m incline at 1.25m/s2 starting from rest at point A (the figure (Figure 1) .) The incline rises at 35.0 ∘ above the horizontal, and at the instant the rocket leaves it, its engines turn off and it is subject only...
Sunday, February 2, 2014 at 11:38pm

Physics
A student drops a rock from a bridge to the water 10.1 m below. The acceleration of gravity is 9.8 m/s^2. With what speed does the rock strike the water? Answer in units of m/s.
Sunday, February 2, 2014 at 11:02pm

Physics
A man at point A directs his rowboat due north toward point B, straight across a river of width 100 m. The river current is due east. The man starts across, rowing steadily at 2.50 m/s and reaches the other side of the river at point C, 150 m downstream from his starting point...
Sunday, February 2, 2014 at 10:54pm

physics
Fn = -4100 + 8000 + 1200 = 5100 N., Due East. = Net force. a = Fn/m = 5100/6800 = 0.75 m/s^2, Due East.
Sunday, February 2, 2014 at 10:17pm

Physics
Time is extraneous in this problem. Mass = Volume x Density Volume = [35 x 1000 x 1000 m^2] [2.4 x 2.54 / 100 m] = 2,133,600 m^3 Density = 103 kg / m^3 --------------------------------------- Mass of rain that fell = 2,133,600 m^3 x 103 kg / m^3 = 219,760,800 kg
Sunday, February 2, 2014 at 9:50pm

Physics
V = Vo + a*t = 0 43 + a*0.28 = 0 0.28a = -43 a = -153.6 m/s^2
Sunday, February 2, 2014 at 9:35pm

URGENT PHYSICS
A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 21.0 m/s. Assuming a uniform rate of increase in angular velocity and a radius of 0.80 m, calculate the angle of this force with respect to the...
Sunday, February 2, 2014 at 8:59pm

Physics
A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 21.0 m/s. Assuming a uniform rate of increase in angular velocity and a radius of 0.80 m, calculate the angle of this force with respect to the...
Sunday, February 2, 2014 at 8:50pm

physics - electric field
f u
Sunday, February 2, 2014 at 8:39pm

physics
the barge is like a carrier that is used on rivers to ship things.
Sunday, February 2, 2014 at 8:29pm

Physics
A severe thunderstorm dumped 2.4 in of rain in 30 min on a town of area 35 km2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.
Sunday, February 2, 2014 at 8:20pm

Physics
Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.4 × 103 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual ...
Sunday, February 2, 2014 at 8:20pm

Physics
The 66 kg man's hands in Figure 9-56 are 36 cm apart. His CG is located 85% of the distance from his right hand toward his left. Find the force on each hand due to the ground.
Sunday, February 2, 2014 at 8:15pm

Physics
Is actualy A 6 kg grinding wheel of radius 0.2 m rotates at a constant rotational frequency of 4(pi) rad/s when an object makes contact with the outer edge of the wheel. Friction causes the wheel to stop in 2 seconds. What is the average torque on the wheel by the frictional ...
Sunday, February 2, 2014 at 8:12pm

Physics
The 66 kg man's hands in Figure 9-56 are 36 cm apart. His CG is located 85% of the distance from his right hand toward his left. Find the force on each hand due to the ground.
Sunday, February 2, 2014 at 7:51pm

physics
Vo*t + 0.5g*t^2 = 100-50 = 50 0 + 4.9t^2 = 50 t^2 = 10.20 t = 3.19 s. V = Vo + g*t = 0 + 9.8*3.19 = 31.3 m/s = The velocity after the 1st 50 m drop = The initial velocity (Vo) for the 2nd 50 m drop. 31.3*t + 4.9t^2 = 50 4.9t^2 + 31.3t - 50 = 0 t = 1.32 s.(Use Quad. Formula).
Sunday, February 2, 2014 at 7:44pm

Physics
The 66 kg man's hands in Figure 9-56 are 36 cm apart. His CG is located 85% of the distance from his right hand toward his left. Find the force on each hand due to the ground.
Sunday, February 2, 2014 at 7:40pm

Physics
The 66 kg man's hands in Figure 9-56 are 36 cm apart. His CG is located 85% of the distance from his right hand toward his left. Find the force on each hand due to the ground.
Sunday, February 2, 2014 at 7:35pm

Physics
A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 22.9 m/s, from a height of 0.8 meters above the ground. The force of ...
Sunday, February 2, 2014 at 6:25pm

college physics
Suppose a 200-kg motorcycle is heading toward a hill at a speed of 30.0 m/s. The two wheels are approximately annular rings with an inner radius of 28.0 cm and an outer radius of 33.0 cm. The mass of one wheel is 12 kg.What is the initial rotational kinetic energy
Sunday, February 2, 2014 at 5:23pm

Physics
Hey bobpursley! ITS 3.09!! YAYY thanks lot!
Sunday, February 2, 2014 at 5:12pm

Physics
Wind is blowing toward south at 8m/s, a runner jogs west at 7 m/s. What is the velocity (speed and direction) of the air relative to the runner?
Sunday, February 2, 2014 at 4:55pm

physics
800+x-1300-400=0 800+x-1700=0 x=900
Sunday, February 2, 2014 at 4:46pm

Physics
heightblue=.5+19.6t-4.9t^2 heightred=+22.1 -7.9(t-2.4)-4.9(t-2.4)^2 set these heights equal, solve for t. Have fun.
Sunday, February 2, 2014 at 4:39pm

Physics
A blue ball is thrown upward with an initial speed of 19.6 m/s, from a height of 0.5 meters above the ground. 2.4 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 7.9 m/s from a height of 22.1 meters above the ground. The force of ...
Sunday, February 2, 2014 at 4:35pm

physics
what is the barge?
Sunday, February 2, 2014 at 4:26pm

Physics
distance covered by behind runner: 3*t distance by starter: 1/2 a t^2 these times have to be equal, so 3t-25=1/2(.1)t^2 multiply by 20, put in quadratic form t^2-60t-500=0 t= (30-+ sqrt(3600/4 +500)) = 30 +- 10 sqrt (9+5) now for an engneering check: let sqrt (15) appx=4 t=70...
Sunday, February 2, 2014 at 4:26pm

physics
A horizontal spring has a spring constant k = 23.2 N/m. A 0.165 kg mass is attached to the spring and is free to slide on a frictionless surface. The mass is pulled 26.2 cm from the equilibrium point. What is the speed (m/s) of the mass as it passes the equilibrium point?
Sunday, February 2, 2014 at 4:17pm

physics
a crew member is walking on a tugboat that is pulling a barge. the tugboat is moving at a constant speed upstream in a river that has a constant downstream current. In the situation above, what is at rest relative to the tugboat?
Sunday, February 2, 2014 at 4:16pm

Physics
In a relay race, runner A is carrying a baton and has a speed of 3.0 m/s . When he is 25M behind the starting line, runner B starts from rest and accelerates at .10 m/s^2. How long afterwards will A catch up with B to pass the baton to B?
Sunday, February 2, 2014 at 3:48pm

Physics
45
Sunday, February 2, 2014 at 3:44pm

physics
ind the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×10^23kg), when Mars is at its closest to Earth (distance = 5.6×10^10m).
Sunday, February 2, 2014 at 3:04pm

physics
Find the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×1023kg), when Mars is at its closest to Earth (distance = 5.6×1010m).
Sunday, February 2, 2014 at 3:01pm

Physics
sorry. (1/2) 2 = 1 meter
Sunday, February 2, 2014 at 2:58pm

Physics
2/1 = 1 meter
Sunday, February 2, 2014 at 2:56pm

Chemistry? Physics? What??
.
Sunday, February 2, 2014 at 2:36pm

Physics
A man 2m tall whose eye level is 1.84m above the ground looks at his image in a vertical mirror. If the man is to be above to see the whole of his body, determine the minimum length of the vertical mirror
Sunday, February 2, 2014 at 12:54pm

physics
A 31-m/s velocity vector that makes an angle of 44° counterclockwise from the -x direction. x: y:
Sunday, February 2, 2014 at 12:40pm

physics
vertical: v = at = -9.8(1) = -9.8 horizontal: constant at 100
Sunday, February 2, 2014 at 11:32am

physics
A rifle bullet is shot horizontally at a velocity of 100 m/s. What is it's vertical velocity after 1 sec? Horizontal velocity after 1 sec?
Sunday, February 2, 2014 at 9:48am

Physics
A 100W incandescent lamp of filament area 45 mm^2, emits all its energy by radiation into the surrounding space of room at 22C. If the filament emissivity is 0.32, find the temperature of the filament?
Sunday, February 2, 2014 at 8:31am

Physics
In a physics experiment, 250g of water is placed in a 50g calorimeter cup made of aluminum when both are at 15C. Steam at 100C is completely absorbed by passing it through the water, raising the temperature of water and cup to 45C. Find the mass of steam absorbed. Specific ...
Sunday, February 2, 2014 at 7:57am

Physics Help
Yes, assuming your vector is 10 degrees above the x axis in the first quadrant your answer is correct. Be sure you have it to 3 significant figures since both 1.00 and 10.00 are three significant figures. 1.00 cos 10.0 = 0.985 1.00 sin 10.0 = 0.174
Sunday, February 2, 2014 at 5:22am

physics
East: 5 - 2 /sqrt 2 = 3.5858 North: 2 + 2/sqrt 2 = 3.414 d^2 = 3.5858^2 + 3.414^2 d = 4.95 km
Sunday, February 2, 2014 at 5:08am

physics
3. A man leaves his home by car and travels 5 km on a road running due East. The driver then turns left and travels 2 km due north to a junction where he joins a road that goes North West and drives a further 2 km. Find his displacement from home by then.
Sunday, February 2, 2014 at 2:28am

physics
tuttjjtjt
Sunday, February 2, 2014 at 12:37am

Physics
B) LOST 63% of its initial energy. I just saw this on my webassign
Sunday, February 2, 2014 at 12:11am

Physics Help
x = 19.4 cos 235° y = 19.4 sin 235° multiply by -2 to get the x,y of -2r. multiply 19.4 by 2 to get the magnitude
Saturday, February 1, 2014 at 11:40pm

physics
just add up the distances: 255 m mighty slow walkin', I must say...
Saturday, February 1, 2014 at 11:38pm

Physics Help
Find components of vector -2r
Saturday, February 1, 2014 at 11:30pm

Physics Help
Find the components of the vector A⃗ with length a = 1.00 and angle α=10.0∘ with respect to the x axis as shown. I can't display the figure obviously, but I figured 1 x cos(10) and 1 x sin(10) would give the two components I need, but I'm still getting...
Saturday, February 1, 2014 at 10:46pm

Physics Help
Position vector r⃗ has magnitude of 19.4m and direction angle 235 degrees What are the x and y components? (x,y) Find the components of the vector −2r⃗ and the magnitude of the vector?
Saturday, February 1, 2014 at 10:27pm

Physics
4.79 m/s/s
Saturday, February 1, 2014 at 10:24pm

physics
8.31 m/s^2
Saturday, February 1, 2014 at 10:20pm

Physics
1. If the angle of the boat is 150 degrees, v' = 3 m/s, and v0 = 3.0 m/s, how far do you drift downstream before you arrive at the other side of the river? (HINT: read the x axis.) 2. If the river flow rate (v0) = 3.0 m/s, and the angle (è, or “theta”) is ...
Saturday, February 1, 2014 at 10:17pm

physics
a=(V^2-Vo^2)/2d = (640^2-0)/2.4=170,667 m/s^2. V = Vo + a*t t=(V-Vo)/a = (640-0)/170,667=0.00375 s. = 3.75 ms.
Saturday, February 1, 2014 at 9:33pm

physics
Dc = Dt 0.5a*t^2 = 9.5*t 1.1t^2 = 9.5t 1.1t^2 - 9.5t = 0 t = 8.64 s. (Use Quad. formula). D = 9.5 * 8.64 = 82.1 m. V = Vo + a*t = 0 + 2.2*8.64 = 19.0 m/s.
Saturday, February 1, 2014 at 9:03pm

Physics
so basically 39%?
Saturday, February 1, 2014 at 8:15pm

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