Number of results: 63
Sunday, August 26, 2007 at 10:54pm by manny
Thursday, September 30, 2010 at 6:36pm by poop
V = Vo + gt = 0 + 9.8*4.5 = 44.1 m/s.
Saturday, January 5, 2013 at 1:45pm by Henry
:) gremlins inhabit my keyboard!
Saturday, March 17, 2012 at 9:11pm by Stephanie
What was the KE of an 8 kg mass at 11 m/s
Friday, February 25, 2011 at 2:06am by aleia
425g/ 22/g cm * 20cm* 5cm help
Monday, June 27, 2011 at 6:52pm by Liz
1/2 m v^2=1/2 k x^2 k= mv^2/x^2 be certain to change km/hr to m/s
Monday, October 12, 2009 at 6:26pm by bobpursley
425g / 22g cm * 22cm * 5cm = 2125cm.
Monday, June 27, 2011 at 6:52pm by Henry
12th grade PYSICS
A motiom of an objects along the circumference of a circle.
Sunday, November 7, 2010 at 6:57pm by Yuvraj s borkar
A ball is dropped from the roof of a building. How fast is it moving after 4.5 seconds? (Absolute value)
Saturday, January 5, 2013 at 1:45pm by meagan
if 15 grams of iron combines with 6.5 grams of oxygen, how much rust is formed
Tuesday, October 16, 2012 at 1:20am by dave
127*distance=49*7 solve for distance
Friday, December 7, 2012 at 7:32pm by bobpursley
What is derivation? How does derivation differe from an experiment or theory?
Sunday, August 26, 2007 at 10:54pm by Janie
what is the velocity of a 1,000 kg cannon that shoots 10 kg bullets at a speed of 380 m/s?
Sunday, January 27, 2013 at 1:52pm by raz
Find the acceleration of the block of mass M = 5.26 kg in the figure below. (Take m = 4.06 kg.)
Thursday, September 22, 2011 at 4:12pm by Quan Jones
a force of 4N at 30 degree from another force 5Nwk is pointing east. find the resistance of the two forces using parallelogram
Saturday, February 23, 2013 at 10:33am by stanley
principles of pysics
A cannon with a long barrel fires a shell faster because the shell experiences a greater ____________________. A) change in inertia. B) impulse. C) acceleration. D) None of these.
Sunday, February 19, 2012 at 3:57pm by Anonymous
What is the minimum work needed to push a 975 kg car 230 m up along a 17.5° incline? Assume the effective coefficient of friction retarding the car is 0.20?
Monday, October 12, 2009 at 6:28pm by Joe
a school bus takes 0.530 h to reach the school from your house. if the average velocity of the bus is 19.0 km/h to the east, what is the displacement?
Thursday, September 30, 2010 at 6:36pm by britt
Pysics Word Problem
Just the reverse of the way you converted 30 km/hr to m/s. 25.9 m/s(3600 s/hr)(1 km/1000m) = ??
Wednesday, August 29, 2007 at 4:20pm by DrBob222
the average speed of light slows to 0.75 when it refracts through a praticular piece of plastic. a. what change is there in the light's frequecny in the plastic? b. in its wavelength?
Tuesday, February 22, 2011 at 10:02am by Sarah
work needed= change of PE+work done on friction = m*g*230*sin17.5 + mg*mu*cos17.5*230 check that and think it out.
Monday, October 12, 2009 at 6:28pm by bobpursley
You must mean that the speed of light slows to 0.75c in the plastic, not 0.75 a) frequency does not change b) wavelength is shortened to 0.75 times the original wavelength (in air).
Tuesday, February 22, 2011 at 10:02am by drwls
A spring stretches 3.4-cm when a 7-g object is hung from it. The object is replaced with a block of mass 24 g that oscillates in simple harmonic motion. Calculate the period of motion
Thursday, January 6, 2011 at 4:44pm by sarah
12th grade PYSICS
A rock tied to a string is swung around in a circle with a radius of 10 ft. The centripetal acceleration is 16.9 ft/sec2. Calculate the speed of the rock.
Sunday, November 7, 2010 at 6:57pm by drake
weight of bucket=50g Now consider the crank and cylinder to be a lever. Force*Leverarm=weigh*cylinderradius force*.29=50g*.071 solve for force.
Friday, December 7, 2012 at 7:36pm by bobpursley
A hot-air balloon is descending at a rate of 1.5 when a passenger drops a camera.If the camera is 41 above the ground when it is dropped, how long does it take for the camera to reach the ground?
Friday, September 24, 2010 at 4:13pm by ju
Equate the heat loss of the coin and the heat gain of the water. Heat transfer is M*C*(delta T) Mcoin*387*80 = 0.112*4186*8.58 The only unknown is Mcoin. Solve for it.
Monday, December 17, 2012 at 12:20pm by drwls
derivation-- proving something that has already been proved experiment---- not a full proof derivation ( may need many trials) theory --- has been proved and takem as a given
Sunday, August 26, 2007 at 10:54pm by manny
a .15 kg ball is placed in a shallow wedge with an opening angle of 120 degrees. for each contatct point between the wedge and the ball, determine the force exerted on the ball. assume the system is frictionless.
Wednesday, November 3, 2010 at 6:20pm by stephanie
A small motor runs a lift that raises aload of bricks weighing 836N to a height of 10.7m in 23.2s. assuming that the bricks are lifted with constant speed, what is the minimum power the motor must produce?
Monday, March 15, 2010 at 5:30pm by Cody
You are walking on a moving walkway in the airport. The length of the walkway is 40.1 m. If your velocity relative to the walkway is 2.41 m/s, and the walkway moves with a velocity of 1.59 m/s, how long will it take you to reach the other end of the walkway?
Wednesday, February 22, 2012 at 2:17pm by jelena pleeease help
well, lets assume it is standing still and then shoots one round. The total momentum remains zero so 0 = 1000 v + 10 * 380 v = -3800/1000 v = - 3.8 m/s The negative sign means the cannon moves backwards if the bullet moves forwards (what else is new?)
Sunday, January 27, 2013 at 1:52pm by Damon
a piston-cylinder device initially contains 0.4m^3 of air at 100KPa and 80 degrees celcius. the air is now compressed to 0.1m^3 in such a way that the temperature inside the cylinder remains constant. determine the workdone by during this process.
Tuesday, October 25, 2011 at 11:03am by charlotte
Planet X has the same mass as earth, but its radius is only half as big. How does the gravity on this planet compare with the gravity on our planet earth?
Saturday, March 17, 2012 at 9:11pm by Stephanie
Brass is an alloy made from copper & zinc. A 0.55 kg brass sample at 96.7 C is dropped into 2.19kg of water at 4.4C. If the equilibrium temp is 7.0C, what isthe specific heat of wter is 4186 j/kg C. Answer in units of J/kg C
Monday, December 17, 2012 at 12:23pm by Anonymous
A mother and daughter are on a seesaw in the park. How far from the center must the 127 lb mother sit in order to balance the 49 lb daughter sitting 7 ft from the center?
Friday, December 7, 2012 at 7:32pm by joshua
A 900 kg car rolling on a horizontal surface has speed v = 60 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2 m. What is the spring stiffness constant of the spring? I solved this and i had 25826.44629, but i am being told i am wrong...
Monday, October 12, 2009 at 6:26pm by TC
A device for training astronauts and jet fighter pilots is designed to rotate a trainee in a horizontal circle of radius 12.0 m.If the force felt by the trainee on her back is 7.80 times her own weight, how fast is she rotating? Express your answer in m/s. Express your answer ...
Sunday, October 23, 2011 at 1:07pm by Mel
Find the velocity of (a) a cylinder and (b) a ring at the bottom of an inclined plane that is 1.55 m high. The cylinder and ring start from rest and roll down the plane. Hint: Carry out the calculation including the unknown parameters, and they may cancel out.
Monday, October 29, 2012 at 2:51pm by Demis
since mass and radius dont matter. Shouldnt the final velocities of a cylinder and a sphere at the bottom of the ramp be the same? No. You have to consider where the mass is. Calculate moment of inertia. See the problem you asked below. items dropped at different heights,do ...
Tuesday, December 12, 2006 at 3:24pm by NICOLE
12th grade PYSICS
A 45.7-kg boy on a swing moves in a circular arc of radius 3.80 m.At the lowest position, the child's speed reaches 2.78 m/s. Determine the magnitude of the tension in each of the two vertical support chains. i used mv^2/r, but i keep getting the answer wrong. the answer ...
Sunday, November 7, 2010 at 6:57pm by Samii
You are the lead scientist for a criminal investigation unit. Your team has found what might be the gun that caused the murder.Unfortunately the bullet that identifies the gun can not be found,but there is enough evidence that if you can figure out the speed of the bullet at a...
Wednesday, October 25, 2006 at 5:39pm by Keshia
A home run just clears a fence 105m from home plate. The fence is 4.00m higher than the height at which the batter struck the ball, and the ball left the bat at a 31.0 degree angle above the horizontal. At what speed did the ball leave the bat?
Tuesday, February 26, 2013 at 12:21am by Susan
one friend is riding his bicycle at the speed of 10m/sec and another friend is riding the bicycle from the opposite direction on same way at same speed and bug is in the middle.what is the distance the bug actually flies before squished.
Sunday, October 31, 2010 at 4:27pm by ganga
Simple. How long does it fly in the air? time= distance/combinedspeed= distance/20 You didn't say the distance, but put that in, and figure time. Now how far does the bug fly? distance=speedbug*timeflying you didn't put the speed of the bug in the problem either.
Sunday, October 31, 2010 at 4:27pm by bobpursley
A wooden bucket ﬁlled with water has a mass of 59 kg and is attached to a rope that is wound around a cylinder with a radius of 0.071 m. A crank with a turning radius of 0.29 m is attached to the end of the cylinder. What minimum force directed perpendicularly to ...
Friday, December 7, 2012 at 7:36pm by joshua
Displacement = velocity * time If the velocity is km/h, and the time is in hours, the displacement is in km.
Thursday, September 30, 2010 at 6:36pm by MathMate
To go straight across, you would have to paddle in an upstream direction with respect to the water. The velocity component across the river would then be sqrt(5^2 - 3^2) = 4 miles/h. The time to go across and back is then T1 = 2 mile/4 mph = 0.5 hours = 30 minutes To go 1 mile...
Thursday, January 26, 2012 at 2:33am by drwls
At the end of the spring term, a high school physics class celebrates by shooting a bundle of exam papers into the town landfill with a homemade catapult. They aim for a point that is 31.1 m away and at the same height from which the catapult releases the bundle. The initial ...
Wednesday, February 22, 2012 at 2:18pm by jelena pleeease help
A hot, just minted copper coin is placed in 112g of water to cool. The water temperature changes by 8.58 C and the temperature of the coin changes by 80.0 C. What is the mass of the coin? Disregard any energy trans to the waters surroundings and assume the specific heat of ...
Monday, December 17, 2012 at 12:20pm by Anonymous
The upward normal force exerted by the floor is 600 N on an elevator passenger who weighs 610 N. What is the reaction force to the upward normal force exerted by the floor? What is the reaction force to weight of the passenger? What is the magnitude of the acceleration?
Wednesday, October 19, 2011 at 4:51pm by Ruth
An aquarium filled with water has flat glass sides whose index of refraction is 1.48. A beam of light from outside the aquarium strikes the glass at a 43.5º angle to the perpendicular . The angle this light ray enters the glass is 27.7º, what is the angle of this ...
Sunday, April 15, 2012 at 8:13am by Charlie
A river is one mile wide and the water flows at the rate 3 miles/hour. If you can paddle a canoe 5 miles/hour in still water, then how long will it take you to paddle across the river and back? How long would it take you to travel one mile upstream (measured along the bank) ...
Thursday, January 26, 2012 at 2:33am by christine
You ride your bike along a straight line from your house to a store 1030 m away. On your way back, you stop at a friend's house which is halfway between your house and the store. a) What is your displacement? Tries 0/5 b) What is the total distance traveled? Tries 0/5 c) ...
Wednesday, February 22, 2012 at 2:13pm by jelena pleeease help
m₁ =0.55 kg,t₁ =96.7℃ c₂=4186 J/kg℃, m₂=2.19 kg, t₂=4.4℃ t= 7℃ Q₁=c₁m₁(t₁-t) Q₂=c₂m₂(t-t₂) Q&#...
Monday, December 17, 2012 at 12:23pm by Elena
Realizing that she often doesn't have her students' full attention during class, a professor devises an elaborate device on which to stand while she lectures. The pulley is placed so that the string makes a 45.0-degree angle with the beam. The beam is uniform, 5.00 ...
Thursday, January 5, 2012 at 5:23pm by Daniel
Pysics Word Problem
4. An automobile is traveling at 30 km/hr. It accelerates at 3 m/s2 until it has covered 100 meters.. What is its new velocity? I asked my teacher on what formula I should use and said I should use this one: V^2= Vo^2+2ax (V^2 is the velocit, Vo is the initial velocity, a is ...
Wednesday, August 29, 2007 at 4:20pm by Emma
ice skater world problem
I wonder what makes this a "world" problem. The same laws of pysics apply to the nationals and regional competitions, as well as practice sessions. Do you mean a WORD problem? When friction can be ignored, which is nearly true in figure skating if you are skating on ...
Monday, April 26, 2010 at 11:13pm by drwls
1. PE = mgh = 0.777 * 9.8 * 6.6 = 50.26J. PE = KE = 50.26, KE = 00.5*0.777V^2 = 50.26 0.389V^2 = 50.26, V^2 = 129.2, Vo = 11.37m/s. 2. h = (Vf^2 - Vo^2) / 2g, h = (0 - (11.37)^2) / -19.6 = 6.6m. 3. Vf^2 = Vo^2 + 2g*d, Vf^2 = 0 + 19.6*6.6 = 129.36, Vf = 11.37m/s. 4. tanA = Y/x...
Tuesday, October 4, 2011 at 11:25am by Henry
A projectile of mass 0.777 kg is shot from a cannon, at height 6.6 m, as shown in the ﬁgure, with an initial velocity vi having a horizontal component of 7.8m/s. The projectile rises to a maximum height of ∆y above the end of the cannons barrel and ...
Tuesday, October 4, 2011 at 11:25am by steve
I'm taking Electronics and Communication Engineering...Can you help me pls...this is my problem=First day of school the teacher ask why did you choose this course? thanks;-) Maybe you chose it because of a natural curiosity and mathematical and analytical skills you may ...
Tuesday, June 5, 2007 at 7:42am by James
help with my topic speech
hi, in my english class we are taking a presuation unit and the next week i must present and speech and give 5 reasons for why something is better than something. well i choosed counter strike becouse it will be easier Stick out tongue [:P] my work is almost done can anyone ...
Friday, March 16, 2007 at 6:39pm by Carlos
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