Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics help!!
An archer shoots an arrow with a velocity of 45 m/s at an angle of 50 degrees with the horizontal.An assistant standing on the level ground 150m downrange from the launch point throws an apple straight up with the minimum intial speed necessary to meet the path of the arrow. (...
Monday, February 18, 2013 at 12:49am

Physics help!!
A tire 0.500 m in radius at a constant rate of 200 rev/min.Find the speed and acceleration of a small stone lodged in the tread of the tire( on its outer edge).
Monday, February 18, 2013 at 12:38am

physics
The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. Suppose that a 62-gal (1.00 gal = 3.79 x 10-3 m3) unit starts with cold water at 11 °C and delivers hot water at 53 °C. The unit is electric and ...
Monday, February 18, 2013 at 12:30am

physics
(a) A defibrillator passes 11.0 A of current through the torso of a person for 0.0300 s. How much charge moves? C (b) How many electrons pass through the wires connected to the patient? electrons
Sunday, February 17, 2013 at 9:55pm

physics
Equal 0.400-kg mass of lead and tin at 60 degrees celsius are placed in 1kg of water at 20 degrees celsius. a) what is the equilibrium temperature of the system? b)if an alloy is half lead and half tin by mass, what specific heat would you anticipate for the alloy? c) how many...
Sunday, February 17, 2013 at 9:48pm

physics
In open heart surgery a much smaller amount of energy will defibrillate the heart. (a) What voltage is applied to the 5.00 µF capacitor of a heart defibrillator that stores 35.0 J of energy? kV (b) Find the amount of stored charge. mC
Sunday, February 17, 2013 at 9:47pm

physics
610 C passes through a flashlight in 0.510 h. What is the average current?
Sunday, February 17, 2013 at 9:40pm

physics
A 1.50-V battery supplies 0.244 W of power to a small flashlight. If the battery moves 2.53 1020 electrons between its terminals during the time the flashlight is in operation, how long was the flashlight used?
Sunday, February 17, 2013 at 9:40pm

physics
What voltage is applied to the 5.00 µF capacitor of a heart defibrillator that stores 35.0 J of energy? In kv.
Sunday, February 17, 2013 at 9:38pm

Physics
A bicycle wheel of radius 0.30 m is spinning at a rate of 60 revolutions per minute. What is the centripetal acceleration of a point that is 0.11 m from the outer edge of the wheel?
Sunday, February 17, 2013 at 8:43pm

Physics
A circular conducting coil with radius 3.40 cm is placed in a uniform magnetic field of 1.090 T with the plane of the coil perpendicular to the magnetic field. The coil is rotated 180° about the axis in 0.222 s. (a) What is the average induced emf in the coil during this ...
Sunday, February 17, 2013 at 8:38pm

physics
A 21.0-g metal cylinder is placed on a turntable, with its center 85 cm from the turntable's center. The coefficient of static friction between the cylinder and the turntable's surface is ìs = 0.83. A thin, massless string of length 85 cm connects the center of ...
Sunday, February 17, 2013 at 8:12pm

Physics
An elevator's cable can handle a tension of 95,500N. Assuming the car has a mass of 2950 kg and it is carrying a full load of passengers whose combined mass is 3750 kg, what is the minimum time required for the elevator to rise 50.0 m from rest? 4.74 s 2.65 s 3.35 s 5.96 s
Sunday, February 17, 2013 at 6:20pm

Chemistry/Physics
I'm not sure how to do this. Determine the actual ratio of 18O:16O for the following substances. a) Snow falling in Greenland at a temperature of -20 degrees C b) Water vapor in equilibrium with VSMOW c) Pore-water from sediments in the North Atlantic corresponding to the ...
Sunday, February 17, 2013 at 6:09pm

Physics
A block of mass 3 kg is at rest on an incline. The coefficient of state friction between the block and incline is 0.34. What is the maximum angle of the incline such that the block will not slide down the plane?
Sunday, February 17, 2013 at 4:35pm

Physics
What is the gravitational force between two 5.00 kg masses that are 10.0 cm apart from center to center? (G = 6.67 × 10-11 N m2/kg2)
Sunday, February 17, 2013 at 4:34pm

physics
Romeo takes a uniform 13.7-m ladder and leans it against the smooth (frictionless) wall of the Capulet residence. The ladder's mass is 23.2 kg and the bottom rests on the ground 3.43 m from the wall. When Romeo, whose mass is 70 kg, gets 88.3 percent of the way to the top...
Sunday, February 17, 2013 at 4:23pm

Quantum Physics
Suppose we have two qubits in the state α|00⟩+β|11⟩. (a) If we measure the fi rst qubit in the sign basis, what is the probability of seeing a +? (b) What is the resulting state of the second qubit in that case?
Sunday, February 17, 2013 at 4:18pm

Physics
A cannon is mounted on a truck that moves forward at a speed of 5 m/s. The operator wants to launch a ball from a cannon so the ball goes as far as possible before hitting the level surface. The muzzle velocity of the cannon is 50 m/s. What angle from the horizontal should the...
Sunday, February 17, 2013 at 4:11pm

Quantum Physics
Suppose that a qubit is in the state |ψ> = a |0> + √ (1-a^2)|1> where a [-1,1] . If we first perform a standard basis measurement on this qubit and then perform a |u>, |u⊥> -basis measurement where |u> = b |0> + √ (1-b^2)|1> for ...
Sunday, February 17, 2013 at 3:38pm

Physics
Work is done on an object of mass 2kg to increase its kenetic energy to 18J. Calculate the speed of the object.
Sunday, February 17, 2013 at 1:43pm

Physics
What is the inner product of 13√|0⟩+2√3√|1⟩ and |+⟩? Rewrite 13√|0⟩+2√3√|1⟩ in the sign basis.
Sunday, February 17, 2013 at 1:30pm

Physics
A two-qubit system was originally in the state 34|00⟩−5√4|01⟩+14|10⟩−14|11⟩, and then we measured the first qubit to be 0. Now, if we measure the second qubit in the standard basis, what is the probability that the outcome ...
Sunday, February 17, 2013 at 1:29pm

Physics
Suppose we have two qubits in the state α|00⟩+β|11⟩. (a) If we measure the first qubit in the sign basis, what is the probability of seeing a +? (b) What is the resulting state of the second qubit in that case? Use a and b to denote α and β ...
Sunday, February 17, 2013 at 1:29pm

Physics
Now note that the following becomes good approximations as θ→0: sinθ≈θ sin2(π4−θ)≈12ͨ2;c⋅θ (where c is some constant.) Use these approximations to estimate the probability of success of the two measurements...
Sunday, February 17, 2013 at 1:28pm

Physics
We have a qubit in the state |ϕ⟩=3√2|0⟩+12|1⟩, which we want to measure in the {cosθ|0⟩+sinθ|1⟩,sinθ|0⟩−cosθ|1⟩} basis. In order for the two possible outcomes to be ...
Sunday, February 17, 2013 at 1:27pm

Physics
A spring, (spring constant of 400 N/m) is displaced .75 m from its equilibrium position. An 8-kg mass is connected to the spring and it is allowed to oscillate horizontally with Simple Harmonic Motion. What is the Kinetic Energy of the mass?
Sunday, February 17, 2013 at 1:03pm

physics
the ends of a light string are tied to two hooks A and Bin are ceiling which 100 cm apart horizontally,so that the length of string of string between hooks is 140 cm.A 650 g of mass is then attached by a second length of string to a point C on the first.80 cm from A,and hanged...
Sunday, February 17, 2013 at 12:25pm

Physics
The Royal Gorge bridge over the Arkansas River is 310.0 m above the river. A 59.0-kg bungee jumper has an elastic cord with an unstressed length of 62.0 m attached to her feet. Assume that, like an ideal spring, the cord is massless and provides a linear restoring force when ...
Sunday, February 17, 2013 at 12:03pm

physics
A stone is thrown horizontally at 30.0 m/s from the top of a very tall cliff. (a) Calculate its horizontal position and vertical position at 2-s intervals for the first 10.0s. (b) Plot your positions from part (a) to scale. Then connect your points with a smooth curve to show ...
Sunday, February 17, 2013 at 11:28am

Physics
A small object of mass 2.60 g and charge -17 µC "floats" in a uniform electric field. What is the magnitude and direction of the electric field?
Sunday, February 17, 2013 at 10:48am

Physics
Calculate the net charge on a substance consisting of a combination of 7.5 multiplied by 1013 protons and 3.5 multiplied by 1013 electrons. Answer in units of C
Sunday, February 17, 2013 at 10:39am

physics
two slabs of thickness 10cm and 2ocm are made of rteel and copper respectively.they are in thermal contact with each oth.the far end of the steel is at 100 degrees celcius amd that of copper is at 0 degrees celcius.determine the temperature at the junction and the rate of the ...
Sunday, February 17, 2013 at 8:45am

Science(applied physics)
At time t=0,a 1kg ball is thrown up from the top of a tall tower with velocity Vo=18i+24j(m/s). a:calculate the components of th velocity at t=6s. b:Calculate the kinetic energy of the ball at t=6s.
Sunday, February 17, 2013 at 6:20am

Physics
A science student is riding on a flatcar of a train travelling along a straight horizontal track at a constant speed of 10.0 m/s.The student throws a ball into the air along a path that he judges to make an initial angle of 60.0 degrees with the horizontal and to be in line ...
Sunday, February 17, 2013 at 5:55am

physics
A pendulum bob of mass 50g hangs in a steady state by athread from the roof of a car as it accelerates horizontally.the angle between the thread and the vertical is 10 degrees. Find the acceleration of the car.
Sunday, February 17, 2013 at 5:03am

Physics ~IMPULSE~
a) A tennis racket a 450 N force on a 0.05 kg tennis ball over a 0.006 s time period. What is the impulse applied to the ball? b) A ball (0.5 kg) is thrown with a velocity of 15 m/s. A receiver catches the ball and brings it to rest is 0.02 s. a) What is the change in momentum...
Saturday, February 16, 2013 at 11:14pm

Physics ~MOMENTUM~
a) what is the momentum of a 4.6 kg baseball moving at 1.4 m/s? b) a child is running with a velocity of 4.5 m/s and has a momentum of 120 kgm/s. What is the child's mass? ~formula~ P=mv help please!!!
Saturday, February 16, 2013 at 11:03pm

Physics
A 100kg steel beam falls from rest from a height of 20m, Find its impact speed.
Saturday, February 16, 2013 at 10:37pm

Physics
A rowboat passenger uses an oar to push the boat off the dock by exerting a force of 40.0 N for 3.0 s. What impulse acts on the boat? What formula do I use?
Saturday, February 16, 2013 at 8:27pm

Physics
How much impulse is given to a 25 kg train car that is accelerated from rest to 12 m/s in 4 sec?
Saturday, February 16, 2013 at 7:20pm

Physics
In a common test for cardiac function (the "stress test"), the patient walks on an inclined treadmill (Figure 6-46). Estimate the power required from a 70 kg patient when the treadmill is sloping at an angle of 15° and the velocity is 3.10 km/h.
Saturday, February 16, 2013 at 6:52pm

Physics
A 0.565 kg wood block is firmly attached to a very light horizontal spring (k = 185 N/m) as shown in Fig. 6-40. It is noted that the block-spring system, when compressed 5.0 cm and released, stretches out 2.3 cm beyond the equilibrium position before stopping and turning back...
Saturday, February 16, 2013 at 6:47pm

Physics
A force of magnitude 7.50 {\rm N} pushes three boxes with masses m_1 = 1.30\,{\rm{kg}},m_2 = 3.20\,{\rm{kg}}, and m_3 = 4.90\,{\rm{kg}}, as shown in the figure(Figure 1) . (Ignore friction.) Find the magnitude of the contact force between boxes 1 and 2, and Find the magnitude ...
Saturday, February 16, 2013 at 5:54pm

Physics 1
A taut string connects a 5-kg crate to a 12-kg crate (see figure below). The coefficient of static friction between the smaller crate and the floor is 0.573; the coefficient of static friction between the larger crate and the floor is 0.443. Find the minimum horizontal force ...
Saturday, February 16, 2013 at 5:42pm

physics
A hang glider is travelling horizontally at 13 m/s and is located 326 m above the surface of the earth. Suddenly and accidentally a water bottle falls from it. How far will the water bottle travel horizontally?
Saturday, February 16, 2013 at 3:45pm

Physics
Factor 122√|00⟩−122√|01⟩+3√22√|10⟩−3√22√|11⟩ into (a|0⟩+b|1⟩)(c|0⟩+d|1⟩), where |a|2+|b|2=1 and |c|2+|d|2=1. What is the value of |a|?
Saturday, February 16, 2013 at 3:33pm

Physics
If the first qubit is in the state 13√|0⟩+2√3√|1⟩ and the second qubit is in the state 2√3√|0⟩+13√|1⟩, what is the state of the composite system?
Saturday, February 16, 2013 at 3:33pm

Physics
Rewrite 13√|0⟩+2√3√|1⟩ in the sign basis.
Saturday, February 16, 2013 at 3:32pm

Physics
What is the inner product of 13√|0⟩+2√3√|1⟩ and |+⟩?
Saturday, February 16, 2013 at 3:32pm

physics
A light spring with spring constant 1 200 N/m is hung from an elevated support. From its lower end hangs a second light spring, which has spring constant 1 800 N/m. An object of mass 1.50 kg is hung at rest from the lower end of the second spring. (a) Find the total extension...
Saturday, February 16, 2013 at 2:53pm

Physics
If a light bulb draws 60 watts and I leave it on for 5 hours, how much energy has been consumed?
Saturday, February 16, 2013 at 11:14am

physics
Two point charges have a total charge of 262 . When placed 1.96 apart, the force each exerts on the other is 18.3 and is repulsive. What is the charge on each
Saturday, February 16, 2013 at 10:46am

Physics
Suppose a 1,600 kg car is traveling at 20.0 m/s. What average force is needed to stop the car in 4.0 s? Can you explain to me how you got your answer, thank you.
Saturday, February 16, 2013 at 10:32am

Physics
A simple pendulum in a certain planet is found to vibrate 50 times in 100s. Find its (a) period, (b) its frequency. (c) When 1.5m of its length is cut, it vibrates 50 times in 50 s. Find the original length of the pendulum. thanks in advance
Saturday, February 16, 2013 at 7:16am

physics
a stone dropped from the top of a cliff received ground in 4 second and burries itself at 0.8 meter into mud.calculate height and retardation.
Saturday, February 16, 2013 at 7:04am

Physics
This is about Elastic Springs.. so far I've answered every question. This is the only one I don't get. It's so confusing for me.. In the laboratory, you attach 300 g mass to a spring of negligible mass and start oscillating it. The elapsed time from when the mass ...
Saturday, February 16, 2013 at 6:51am

physics
A cylindrical tube open at both ends is made of metal. The internal diameter of the tube is 11.2 cm and its length is 21 cm. The metal every where is 0.4 cm thick. Calculate the volume of the metal correct to 1 place of decimal
Saturday, February 16, 2013 at 6:14am

Physics
Two negative charges each of unit magnitude and a positive charge q are placed along a straight line. At what value of q will the system be in equilibrium? Check whether it is stable, unstable or neutral equilibrium.
Saturday, February 16, 2013 at 6:06am

physics
An object is dropped from a height of 49 meters. The object takes 3.2s to hit the ground. The final velocity of the object when it hits the ground is 31 m/s
Saturday, February 16, 2013 at 1:57am

Physics
In order to measure the length of a long flourescent ceiling lamp, a student makes a very small hole in a piece of paper, holds the paper above the floor, measures the distance between the hole and the floor, and finally measures the length of the light's image on the ...
Saturday, February 16, 2013 at 12:22am

Physics
A uniform ladder weighing 197 N is leaning against a wall. The ladder slips when θ = 63.0°. Assuming that the coefficients of static friction at the wall and the ground are the same, obtain a value for µs.
Friday, February 15, 2013 at 11:36pm

physics
The terminal speed of a sky diver is 157 km/h in the spread-eagle position and 330 km/h in the nosedive position. Assuming that the diver's drag coefficient C does not change from one position to the other, find the ratio of the effective cross-sectional area A in the ...
Friday, February 15, 2013 at 10:58pm

Physics
You testify as an "expert witness" in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill. You find that the slope of the hill is theta= 12.0°, that the cars were separated by ...
Friday, February 15, 2013 at 10:19pm

Physics
You're sailboarding at 7.0 m/s when a wind gust hits, lasting 6.8 s accelerating your board at 0.47 m/s2 at a 35 degrees to your original direction.
Friday, February 15, 2013 at 9:00pm

Physics (vectors)
I am stuck with this question.Please help. I have a triangle that is not a right triangle with sides A, B, and C.(no values).The arrow's heads of A and B are joined and the arrow's head of C is in the tail of B. If the resultant is A,what is the vector equation, and ...
Friday, February 15, 2013 at 8:25pm

physics
A 1,600 kg car traveling north at 10.0 m/s crashes into a 1,400 kg car traveling east at 15 m/s at an unexpectedly icy intersection. The cars lock together as they skid on the ice. What is their speed after the crash?
Friday, February 15, 2013 at 7:51pm

Physics or math (very simple terminology question)
"Describe the characteristics of each graph (for example, . . . ., zero or non-zero intercept value)." I guess a zero intercept value would be if the line is on the point (0,0)/the origin. But what if the line starts at (0,1) or (2,0). Because then the x intercept is...
Friday, February 15, 2013 at 6:55pm

Physics (vectors)
Please help me with this question. I have a triangle that is not a right triangle with sides A, B, and C.(no values).The arrow's heads of A and B are joined and the arrow's head of C is in the tail of B. How do you find the resultant, the vector equation, and the ...
Friday, February 15, 2013 at 6:48pm

Physics
A charge of 3.93 is placed at each corner of a square 0.470 on a side. Determine the magnitude of the force on each charge.
Friday, February 15, 2013 at 6:23pm

Physics
A charge of 3.93 is placed at each corner of a square 0.470 on a side. Determine the magnitude of the force on each charge.
Friday, February 15, 2013 at 6:21pm

Physics
The electric potential inside a charged spherical conductor of radius R is given by V = kQ/R, and the potential outside is given by V = kQ/r. Using Er = -dV/dr, derive the electric field inside and outside this charge distribution.
Friday, February 15, 2013 at 3:59pm

Physics 2 with calculus
The wires leading to and from a 0.12--diameter lightbulb filament are 1.5 in diameter. The wire to the filament carries a current with a current density of 4.0×105 . what is the current density in the filament?
Friday, February 15, 2013 at 3:27pm

physics
An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field. Find the ratio of the radii of their circular orbits when the electron and proton have A. the same momentum B. the same kinetic energy
Friday, February 15, 2013 at 3:21pm

Physics
Aaron (mass 60 kg) catches his running cat (mass 5 kg) moving horizontally at 1.5 m/s. What is the speed of Aaron and his cat after the catch?
Friday, February 15, 2013 at 3:04pm

Physics
At the low point in its swing, a pendulum bob with a mass of 0.2 kg has a velocity of 4 m/s What is the Kinetic at the low point? and Ignoring air resistance how high will the bob swing above the low point before reversing direction?
Friday, February 15, 2013 at 2:00pm

physics
calculate the momentum of an object if: a. its mass is 4kg and its velocity is 8m/s b. its mass is 500g and its velocity is 3m/s c. a force of 20N is applied to it for 6s and it moves from rest D. its mass is 2kg and it falls from rest for 10s (assume g = 10ms-2 or 10Nkg-1)
Friday, February 15, 2013 at 11:30am

Physics
A model rocket launches with an initial velocity of 6 m/s, at an angle of 90 degrees (with respect to the horizon). The rocket's engine provides an acceleration of 2.2 m/s2, acting in the same direction as the initial velocity. After 20 seconds, the rocket engine cuts out...
Friday, February 15, 2013 at 9:30am

physics
An artificial sattelite as a mars of 600 kg and moving towards moon.calculate its kinetic energy and potential energy in mJ relative to the earth when it is 50 km from launching and moving at 2500 km/h take acceleration of earth gravitational field as 790 cm/s*s
Friday, February 15, 2013 at 5:46am

physics
A 60W light bulb is connected to a 120V outlet. How long in seconds does it take for 1 billion (109) electrons to pass through the light bulb?
Friday, February 15, 2013 at 2:18am

physics
Three charges are located on a horizontal axis. 12 µC −0.8 µC 12 µC p 1.69656 m 2.9 m 2.9 m Determine the magnitude of the electric ﬁeld at p, vertically above the charge −0.8 µC as shown in the ﬁgure. Let up be the positive ...
Friday, February 15, 2013 at 12:30am

physics
A body moves in a straight line with initial velocity and uniform acceleration. Find how far it travels in 12s, giving that it travels 246m in the first 6seconds and 69m in the last 3seconds. Find also the initial velocity.
Friday, February 15, 2013 at 12:21am

physics
A particle is travelling on a straight line with constant acceleration. It covers 6m in the 4th second and 7m in the 5th second. Fine its acceleration and initial speed.
Friday, February 15, 2013 at 12:01am

physics..............
If you ever watch track and field at the Olympics, you'll notice that the starting points of the runners are not even if the race is run on a curve and the runners have to run in lanes. This is to offset the fact that the distances along each lane are unequal on a curve. ...
Thursday, February 14, 2013 at 11:30pm

physics.........
The waterfall "Angel Falls" in Venezuela is the world's tallest at h=979 m. Assume that the water's velocity on the top of the falls and on the bottom of the falls (after it hits the ground and begins to flow away) is equal, and that no total energy is lost ...
Thursday, February 14, 2013 at 11:29pm

physics!
In order to measure the length of a long flourescent ceiling lamp, a student makes a very small hole in a piece of paper, holds the paper above the floor, measures the distance between the hole and the floor, and finally measures the length of the light's image on the ...
Thursday, February 14, 2013 at 11:29pm

Physics
A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V. (C is the capacitance and U is the stored energy.) Answer the following questions regarding the capacitor charged by a battery. For ...
Thursday, February 14, 2013 at 10:07pm

physics
The two masses on either side of the pulley, 2.2 kg and 3.6 kg, are each initially 1.8 m above the ground, and the massless frictionless pulley is 4.8m above the ground.What maximum height does the lighter object reach after the system is released? [Hint: First determine the ...
Thursday, February 14, 2013 at 10:07pm

physics
A pulley is suspended by a Cord (C). on one end of the pulley there is a 1.2 kg block and on the other is a 3.2 kg block.Determine the tension in this cord after the masses are released and before one hits the ground. Ignore the mass of the pulley and cords
Thursday, February 14, 2013 at 10:05pm

physics
Mass m_a rests on a smooth horizontal surface,m_b hangs vertically.If m_a=15.0kg and m_b=8.0kg, determine the magnitude of the acceleration of each block.
Thursday, February 14, 2013 at 10:03pm

physics
An object is hanging by a string from your rearview mirror.While you are accelerating at a constant rate from rest to 30m/s in 5.5s , what angle theta does the string make with the vertical?
Thursday, February 14, 2013 at 9:53pm

physics
A skateboarder, with an initial speed of 2.4m/s , rolls virtually friction free down a straight incline of length 19m in 3.5m/s .At what angle theta is the incline oriented above the horizontal?
Thursday, February 14, 2013 at 9:51pm

physics
For a simple 15 upward ramp, what length would be needed for a runaway truck traveling 140 ?
Thursday, February 14, 2013 at 9:49pm

physics
A child on a sled reaches the bottom of a hill with a velocity of 10.0 and travels 23.0 along a horizontal straightaway to a stop.If the child and sled together have a mass of 58.0 , what is the magnitude of the average retarding force on the sled on the horizontal straightaway?
Thursday, February 14, 2013 at 9:47pm

Physics
A certain substance has a dielectric constant of 2.8 and a dielectric strength of 18.0 MV/m. If it is used as the dielectric material in a parallel-plate capacitor, what minimum area should the plates of the capacitor have to obtain a capacitance of 7.00×10-8 F and to ...
Thursday, February 14, 2013 at 9:44pm

Physics
The stored electrical energy of a 350-μ F capacitor charged to 1.20×104 Volts is converted to thermal energy by discharging the capacitor through a heating element submerged in 548.0 g of water in an insulating cup. What is the increase in temperature of the water ...
Thursday, February 14, 2013 at 9:44pm

Physics 212
Three equal point charges, each with charge 1.50\mu C , are placed at the vertices of an equilateral triangle whose sides are of length 0.300m . What is the electric potential energy U of the system? (Take as zero the potential energy of the three charges when they are ...
Thursday, February 14, 2013 at 7:49pm

physics
Two spherical objects are separated by a distance of 1.41 × 10^-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result, each...
Thursday, February 14, 2013 at 5:21pm

physics
An electrically neutral model airplane is flying in a horizontal circle on a 2.0-m guideline, which is nearly parallel to the ground. The line breaks when the kinetic energy of the plane is 50 J. Reconsider the same situation, except that now there is a point charge of +q on ...
Thursday, February 14, 2013 at 5:21pm

physics
An electric field of 210000 N/C points due west at a certain spot. What is the magnitude of the force that acts on a charge of -6.2C at this spot?
Thursday, February 14, 2013 at 5:20pm

physics
Two point charges of the same magnitude but opposite signs are fixed to either end of the base of an isosceles triangle. The electric field at the midpoint M between the charges has a magnitude EM. The field directly above the midpoint at point P has a magnitude EP. The ratio ...
Thursday, February 14, 2013 at 5:19pm

physics
A 50.0-kg box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at one instant the box is sliding to the right at 1.5 m/s and that it stops in 2.5 s with uniform acceleration. What magnitude force does friction ...
Thursday, February 14, 2013 at 4:34pm

physics
Now note that the following becomes good approximations as θ→0: sinθ≈θ sin2(π4−θ)≈12ͨ2;c⋅θ (where c is some constant.) Use these approximations to estimate the probability of success of the two measurements...
Thursday, February 14, 2013 at 4:30pm

physics
A particle moving in a straight line with constant acceleration passing over a distance x,y,z in equal consecutive intervals of time (t). find the relations between x,y,z. Find the acceleration of the particle.
Thursday, February 14, 2013 at 4:29pm

Physics
We have a qubit in the state |ψ>= √3/2 |0>+ 1/2 |1>, which we want to measure in the {Cos θ |0> + Sin θ |1>, Sin θ |0> - Cos θ |1>} basis. In order for the two possible outcomes to be equiprobable, what should be the value of...
Thursday, February 14, 2013 at 4:25pm

Physics
Two particles each have a mass of 5.5 10-3 kg. One has a charge of +4.8 10-6 C, and the other has a charge of -4.8 10-6 C. They are initially held at rest at a distance of 0.88 m apart. Both are then released and accelerate toward each other. How fast is each particle moving ...
Thursday, February 14, 2013 at 4:14pm

Physics
Joanne drives her car with a mass of 1000 {\rm kg} at a speed of 23m/s . Find a road friction force that is need to bring her car to a halt in 14s .
Thursday, February 14, 2013 at 4:13pm

college physics 1
The coefficient of static friction between a block of wood of mass 29.2-kg and a rough table is 0.51. The table is slowly tilted until the block of wood starts to slide down the surface. At what angle of the table with respect to the horizontal does the wood start to slide? ...
Thursday, February 14, 2013 at 3:21pm

physics
at birth,baby jordaan weighed 3kg and his length was measured to 0.40m.after a few months,baby's mass doubled.determine the new length
Thursday, February 14, 2013 at 3:14pm

physics
at birth,baby jordaan weighed 3kg and his lengh was measured to 0.40m.after a few months,baby's mass doubled.determine the nwe lengh
Thursday, February 14, 2013 at 3:11pm

physics
A moving particle encounters an external electric field that decreases its kinetic energy from 10360 eV to 7680 eV as the particle moves from position A to position B. The electric potential at A is -52.5 V, and the electric potential at B is +29.7 V. Determine the charge of ...
Thursday, February 14, 2013 at 2:50pm

Physics
If the force of the road on the car's wheels, pushing it forward, is a constant 3.5 kN, and the car's mass is 2 kg, then how long will the car take to go from 15 m/s to 50 m/s?
Thursday, February 14, 2013 at 2:33pm

Mechanics _ physics
A uniform bar 1m long is pivoted at the centre has a mass of 3kg. It is acted upon by a conquer which cause to possess an angular acceleration of 6rad/sec^2; calculate a. The moment of inertia of the bar b. The torque on the bar
Thursday, February 14, 2013 at 2:07pm

Mechanics _ physics
A wheel rotating with an angular velocity of 16rad/sec is slowed to an angular velocity of 4rad/sec by an angular acceleration of 2rad/sec^2.find a. The angle turned in the process of slowing down b. The time required
Thursday, February 14, 2013 at 2:03pm

physics
If a protonand an electron are released when they 2.0X10^-10m apart, find the initial accelerationof each of them. I know a=ke^2/mr^2 k = 8.99 x 10^9 e = 1.6 x 10^-19 r = 2.0x 10^-10 so what is the m ????
Thursday, February 14, 2013 at 10:19am

physics
charge q1=+4.00nc is located at x=0.200m, and q2 =+5.00nc is at x=-0.300 m. what are the magnitude and directionof the net force exerted by these two charges ona negative point charge q3 = -0.600 nc placed at the origin ? I think I need to find the F of q1q3 then find the F of...
Thursday, February 14, 2013 at 10:15am

Physics
You drop an object from atop a building and it takes 7.20-sec before it hits the ground. Assume that there is no air resistance, how tall is this building?
Thursday, February 14, 2013 at 9:28am

physics
Each of the four circuits in the drawing consists of a single resistor whose resistance is either R or 2R, and a single battery whose voltage is either V or 2V. The unit of voltage in each circuit is V = 10 V and the unit of resistance is R = 8 Ω. Determine (a) the power ...
Thursday, February 14, 2013 at 6:02am

physics
You are lying on the beach on a tropical island on the equator, watching the Sun set - what a beautiful scene! Immediately after the top of the Sun disappears, you stand up to watch the Sun set again. After the amount of time t=10 s the top of the Sun disappears again. Given ...
Thursday, February 14, 2013 at 2:21am

Physics
A 0.03-kg bullet is fired vertically at 200m/s into a 0.15-kg baseball that is initially at rest. The bullet lodges in the baseball and, after the collision, the baseball/bullet rise to a height of 37m. (a). What was the speed of the baseball/bullet right after the collision...
Thursday, February 14, 2013 at 1:48am

Physics
Jo student undertakes a unique experiment with his calculator. He goes to the school roof that is 18.0 m above the ground. He throws the poor calculator upward with a velocity of 42 m/s. Assume that the calculator goes straight up and just misses the roof on its way to the ...
Thursday, February 14, 2013 at 1:33am

Physics
If a small planet were located 7 times as far as the Earth's distance from the Sun, it period is ___ earth years?
Thursday, February 14, 2013 at 12:20am

Physics
Calculate the average speed of the car in km/h, it can accelerate from 96.56 km/hr in 4.3 seconds. Distance is not provided
Wednesday, February 13, 2013 at 11:04pm

Physics (Formula)
A string requires a 191.0 N force in order to break. A 1.75 kg mass is tied to this string and whirled in a vertical circle with a radius of 1.92 m. The maximum speed that this mass can be whirled without breaking the string is Again I just need the formula!
Wednesday, February 13, 2013 at 10:24pm

Physics (Formula)
I just need the formula. A 2.5 kg object is whirled in a vertical circle whose radius is 0.89 m. If the time of one revolution is 0.94 s, the magnitude of the tension in the string (assuming uniform speed) when it is at the top is
Wednesday, February 13, 2013 at 10:23pm

Physics
A 9.3 kg mass is attached to a hanging vertical spring with k=49 N/m. If the mass is released when the spring is unstretched, how fast will it be moving as it falls past the equilibrium point?
Wednesday, February 13, 2013 at 10:06pm

Physics
7. A formula 1 racecar is capable of very quick starts (with a launch control system, that prevents the wheels from spinning during rapid acceleration)). A 2011 Ferrari (driven by none other than Agent 001) is initially at rest, and undergoes a constant acceleration of 14 m/s^...
Wednesday, February 13, 2013 at 9:43pm

Physics
In his car, a driver tosses an egg vertically from chest height so that the peak of its path is just below the ceiling of the passenger compartment, which is 56 cm above his release point. He catches the egg at the same height at which he released it. (a) If you are a roadside...
Wednesday, February 13, 2013 at 9:34pm

Physics
An elevator (cabin mass 600 kg) is designed for a maximum load of 2800 kg, and to reach a velocity of 3.6 m/s in 5 s. For this scenario, what is the tension the elevator rope has to withstand?
Wednesday, February 13, 2013 at 8:21pm

Physics
"A jogger runs with a velocity of 6.0 km/h [25° N of W] for 35 min and then changes direction, jogging for 20 min at 4.5 km/h [65° E of N]. Using a vector diagram, determine the jogger's total displacement and his average velocity for the workout." I know...
Wednesday, February 13, 2013 at 8:08pm

Physics
Traveling at a speed of 15.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.640. What is the speed of the automobile after 1.45 s have elapsed? Ignore the effects of ...
Wednesday, February 13, 2013 at 8:00pm

Physics
A 4.51-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.382. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an ...
Wednesday, February 13, 2013 at 8:00pm

Physics
A rocket blasts off from rest and attains a speed of 30.4 m/s in 10.3 s. An astronaut has a mass of 60.1 kg. What is the astronaut's apparent weight during takeoff?
Wednesday, February 13, 2013 at 7:59pm

Physics
The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on the earth? Give your answer by determining the ratio Fsun/Fmoon of the magnitudes of the gravitational forces. Use the data on ...
Wednesday, February 13, 2013 at 7:59pm

Physics
A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe, starting from rest, takes...
Wednesday, February 13, 2013 at 7:59pm

Physics
At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 940 m/s2 and the vertical or y component of its acceleration is 710 m/s2. The ball's mass is 0.35 kg. What is the ...
Wednesday, February 13, 2013 at 7:58pm

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