Thursday

July 31, 2014

July 31, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

A small rocket is fired in a test range. It rises high into the air and soon runs out of fuel. On the way down it passes near an observer (sitting in a 22.5-m-high tower) who sees the rocket traveling at a speed of 37.9 m/s and moving in a vertical plane at an angle of 50.8&...
*Tuesday, January 28, 2014 at 12:00am*

**Physics**

A baggage carousel at an airport is rotating with an angular speed of 0.397 rad/s when the baggage begins to be loaded onto it. The moment of inertia of the carousel is 2440 kg·m2. Ten pieces of baggage with an average mass of 16.5 kg each are dropped vertically onto ...
*Monday, January 27, 2014 at 10:40pm*

**Physics**

A train moving at a constant speed of 61.0 km/h moves east for 35.0 min, then in a direction 50.0° east of due north for 10.0 min, and then west for 49.0 min. What is the average velocity of the train during this run? What is the magnitude of that velocity? What is the ...
*Monday, January 27, 2014 at 10:39pm*

**Physics**

A baggage carousel at an airport is rotating with an angular speed of 0.397 rad/s when the baggage begins to be loaded onto it. The moment of inertia of the carousel is 2440 kg·m2. Ten pieces of baggage with an average mass of 16.5 kg each are dropped vertically onto ...
*Monday, January 27, 2014 at 10:10pm*

**Physics**

A stationary bicycle is raised off the ground, and its front wheel (m = 1.70 kg) is rotating at an angular velocity of 21.9 rad/s (see the figure). The front brake is then applied for 1.35 s, and the wheel slows down to 4.47 rad/s. Assume that all the mass of the wheel is ...
*Monday, January 27, 2014 at 10:10pm*

**Physics**

An alpine rescue team is using a slingshot to send an emergency medical packet to climbers stranded on a ledge. (height=252 m, horizontal distance=416 m, landing angle= 75° below the horizontal). What should be the launch speed from the slingshot? What is the launch angle...
*Monday, January 27, 2014 at 10:04pm*

**physics**

according to recent typical test data, a Ford Focus travels 0.23 mi in 19 seconds, starting from rest. The same car, when braking from 59.0mph on dry pavement, stops in 141 ft. Assume constant acceleration in each part of its motion, but not necessarily the same acceleration ...
*Monday, January 27, 2014 at 9:50pm*

**PHYSICS**

Two identical teflon rods are 10 centimeters long and rubbed with fur so that they each have a total negative charge of 20 microCoulombs that is uniformly distributed along their length. They are arranged along the same axis, with their ends 5 centimeters apart. What is the ...
*Monday, January 27, 2014 at 9:41pm*

**Physics**

An alpine rescue team is using a slingshot to send an emergency medical packet to climbers stranded on a ledge. (height=252 m, horizontal distance=416 m, landing angle= 75° below the horizontal).
*Monday, January 27, 2014 at 9:26pm*

**physics**

Vector has a magnitude of 122 units and points 37.0 ° north of west. Vector points 64.0 ° east of north. Vector points 17.0 ° west of south. These three vectors add to give a resultant vector that is zero. Using components, find the magnitudes of (a) vector and (b...
*Monday, January 27, 2014 at 8:57pm*

**physics**

A jogger travels a route that has two parts. The first is a displacement of 2.15 km due south, and the second involves a displacement that points due east. The resultant displacement + has a magnitude of 3.95 km. (a) What is the magnitude of , and what is the direction of + as...
*Monday, January 27, 2014 at 8:46pm*

**physics**

A car is being pulled out of the mud by two forces that are applied by the two ropes shown in the drawing. The dashed line in the drawing bisects the 30.0° angle. The magnitude of the force applied by each rope is 2900 newtons (N). (a) How much force would a single rope ...
*Monday, January 27, 2014 at 8:38pm*

**physics**

Three deer, A, B, and C, are grazing in a field. Deer B is located 63.4 m from deer A at an angle of 50.8 ° north of west. Deer C is located 76.7 ° north of east relative to deer A. The distance between deer B and C is 96.7 m. What is the distance between deer A and C?
*Monday, January 27, 2014 at 8:36pm*

**Physics**

A meter stick balances at the 50.0-cm mark. You tie a 20N weight at the 20cm mark. Where should a 30N weight be placed so the meter stick will again be balanced?
*Monday, January 27, 2014 at 8:24pm*

**Physics**

In Cambridge, England, a seconds pendulum is 0.9942 m long. What is the free-fall acceleration in Cambridge? (Use 4 significant figures in your answer.)
*Monday, January 27, 2014 at 8:19pm*

**Physics**

A pilot flies a plane at a speed of 600 km/h with respect to the surrounding air. A wind is blowing to the northeast at a speed of 100 km/h. In what direction must the plane be aimed so that the resulting direction of the plane is due north?
*Monday, January 27, 2014 at 7:59pm*

**physics**

A 6.30kg block is pushed 9.50m up a smooth 35.0∘ inclined plane by a horizontal force of 77.0N . If the initial speed of the block is 3.15m/s up the plane. What is the initial kinetic energy of the block, the work done by the 77.0N force, the work done by gravity, the ...
*Monday, January 27, 2014 at 7:46pm*

**physics **

Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 5.5 m/s2 for 4.9 seconds. It then continues at a constant speed for 6.7 seconds, before applying the brakes such that the car...
*Monday, January 27, 2014 at 7:25pm*

**Physics**

Find the length of a pendulum that oscillates with a frequency of 0.37 Hz.
*Monday, January 27, 2014 at 6:54pm*

**physics**

a projectile is ejected from a 25 m high tower with a velocity of 40 m/s at an angle of 30 degrees to the horizontal first on Earth and then on Mars. What is the ratio of the time taken to hit the ground on Mars compared to Earth? (Assume gravity on mars = .38gEarth) The ...
*Monday, January 27, 2014 at 6:49pm*

**PHYSICS**

Two identical teflon rods are 10 centimeters long and rubbed with fur so that they each have a total negative charge of 20 microCoulombs that is uniformly distributed along their length. They are arranged along the same axis, with their ends 5 centimeters apart. What is the ...
*Monday, January 27, 2014 at 5:12pm*

**physics**

An electric heater used to boil small amounts of water consists of a 25-Ω coil that is immersed directly in the water. It operates from a 60-V socket. How much time is required for this heater to raise the temperature of 0.50 kg of water from 29° C to the normal ...
*Monday, January 27, 2014 at 4:56pm*

**physics (clear answer)**

A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. The ball leaves the club at a speed of 16.0 m/s at an angle of 38.5° above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
*Monday, January 27, 2014 at 4:37pm*

**physics**

A tungsten wire has a radius of 0.077 mm and is heated from 20.0 to 1205 °C. The temperature coefficient of resistivity is α = 4.5 10-3 (C°)−1. When 110 V is applied across the ends of the hot wire, a current of 1.3 A is produced. How long is the wire? ...
*Monday, January 27, 2014 at 4:36pm*

**Please help with Physics Quickly**

1. How are impulse and momentum related? (Points : 1) Impulse is the change in momentum of an object. Momentum is the change in impulse acting on an object. Impulse and momentum are always equal in magnitude. Impulse and momentum are the same thing. Question 2. 2. Which of ...
*Monday, January 27, 2014 at 2:32pm*

**URGENT Physics PLEASE help**

5. A 1,600 kg car is moving south at 24 m/s. What is its momentum? (Points : 1) 66 kgm/s south 66 kgm/s north 38,000 kgm/s north 38,000 kgm/s south Question 6. 6. The velocity of a 150 kg cart changes from 6.0 m/s to 14.0 m/s. What is the magnitude of the impulse that acted on...
*Monday, January 27, 2014 at 2:31pm*

**Physics**

A diver springs upward from a board that is 3.20 m above the water. At the instant she contacts the water her speed is 11.4 m/s and her body makes an angle of 68.7 ° with respect to the horizontal surface of the water. Determine her initial velocity, both (a) magnitude and...
*Monday, January 27, 2014 at 2:09pm*

**physics**

a block with a velocity 4m/s slides 8m across a rough horizontal floor before coming to rest.the coefficient of friction is.
*Monday, January 27, 2014 at 1:23pm*

**physics**

If the total positive charge is Q = 1.62×10−6C , what is the magnitude of the electric field caused by this charge at point P, a distance d = 1.53m from the charge? (Figure 1) Enter your answer numerically in newtons per coulomb.
*Monday, January 27, 2014 at 1:22pm*

**physics**

What is the magnitude of the electric field a distance 3.0mm from an electron? Express your answer to two significant figures and include the appropriate units
*Monday, January 27, 2014 at 1:15pm*

**physics**

Two small charged balls have a repulsive force of 0.20N when they are separated by a distance of 0.90m . The balls are moved closer together, until the repulsive force is 0.58N . How far apart are they now? Express your answer to two significant figures and include the ...
*Monday, January 27, 2014 at 1:12pm*

**physics**

Three charges are fixed in the x−y plane as follows: 1.5nC at the origin (0, 0); 2.6nC at (0.65m , 0); –1.8nC nC at (0, 1.50m ). Find the force acting on the charge at the origin. Express your answers using two significant figures. Enter the x and y components of ...
*Monday, January 27, 2014 at 1:10pm*

**physics**

Three charges are fixed in the x−y plane as follows: 1.7nC at the origin (0, 0); 2.3nC at (0.60m , 0); –2.0nC at (0, 1.20m ). Find the force acting on the negative charge. Express your answer using two significant figures. Enter the x and y components of the force ...
*Monday, January 27, 2014 at 1:10pm*

**Physics**

What is the net force exerted by these two charges on a third charge q 3 = 45.0nC placed between q 1 and q 2 at x 3 = -1.145m ? Your answer may be positive or negative, depending on the direction of the force. Express your answer numerically in newtons to three significant ...
*Monday, January 27, 2014 at 1:08pm*

**physics PLEASE HELP**

1.state the mathematical relationship between the net force acting on an object and the object's change in momentum. 2state the mathematical relationship between the net force acting on an object and the time taken to change the object's momentum
*Monday, January 27, 2014 at 9:17am*

**Physics**

A single electron orbits a lithium nucleus that contains three protons (+3e). The radius of the orbit is 1.76*10^-11m. Determine the kinetic energy of the electron.
*Monday, January 27, 2014 at 12:16am*

**Physics**

What is the frequency of a blue light with a wavelength of 489 nm
*Sunday, January 26, 2014 at 11:29pm*

**physics**

A girl coasts down a hill on a sled, reaching level ground at the bottom with a speed of 7.0 m/s. The coeﬃcient of kinetic friction between the sled’s runners and the hard, icy snow is 0.054, and the girl and sled together weigh 749 N. The acceleration of gravity ...
*Sunday, January 26, 2014 at 11:21pm*

**physics**

A girl coasts down a hill on a sled, reaching level ground at the bottom with a speed of 7.0 m/s. The coeﬃcient of kinetic friction between the sled’s runners and the hard, icy snow is 0.054, and the girl and sled together weigh 749 N. The acceleration of gravity ...
*Sunday, January 26, 2014 at 10:31pm*

**Physics**

A stone is thrown directly upward from rest from ground level with initial speed 20.0 m/s; 1.50 s after that, a second stone is thrown directly upward from ground level with initial speed 18.0 m/s. (a) When are the stones at the same height? (b) What are the velocities of the ...
*Sunday, January 26, 2014 at 10:31pm*

**Physics**

Two copper cylinders, immersed in a water tank at 46.3°C contain helium and nitrogen, respectively. The helium-filled cylinder has a volume twice as large as the nitrogen-filled cylinder. a) Calculate the average kinetic energy of a helium molecule at 46.3°C. b) ...
*Sunday, January 26, 2014 at 10:24pm*

**Physics**

Consider hydrogen gas, H2, at 24.3°C. What percentage of hydrogen molecules have a speed within 1.00 m/s of the most probable speed?
*Sunday, January 26, 2014 at 10:19pm*

**physics**

An ambulance is traveling east at 60.7 m/s. Behind it there is a car traveling along the same direction at 32.3 m/s. The ambulance driver hears his siren at a frequency of 521 Hz. At what frequency does the driver of the car hear the ambulance’s siren? The velocity of ...
*Sunday, January 26, 2014 at 9:41pm*

**physics**

A train is moving parallel and adjacent to a highway with a constant speed of 23 m/s. A car is traveling in the same direction as the train at 46 m/s. The car’s horn sounds at 550 Hz and the train’s whistle sounds at 360 Hz. When the car is behind the train what fre...
*Sunday, January 26, 2014 at 9:40pm*

**physics**

A train is moving parallel and adjacent to a highway with a constant speed of 23 m/s. A car is traveling in the same direction as the train at 46 m/s. The car’s horn sounds at 550 Hz and the train’s whistle sounds at 360 Hz. When the car is behind the train what fre...
*Sunday, January 26, 2014 at 9:37pm*

**physics**

What is the expected period of beats formed when two tuning forks sound simultaneously and have the frequencies f1= 250Hz and 242Hz?
*Sunday, January 26, 2014 at 9:01pm*

**physics**

You are a Middle Ages cannonball scientist attacking a castle a distance D away. Your job is to get a cannonball of mass m over the walls, which are a height H above the top of the cannonball launcher. At the instant when the cannonball leaves the launcher it will be traveling...
*Sunday, January 26, 2014 at 6:05pm*

**physics**

While working on your physics homework in your dorm room you notice a flowerpot fall past your window because someone has carelessly knocked it off the roof. Fortunately, you computer¡¯s video camera captured the whole thing so you can measure the total time the pot...
*Sunday, January 26, 2014 at 6:03pm*

**physics**

A barefoot ﬁeld-goal kicker imparts a speed of 33 m/s to a football initially at rest. If the football has a mass of 0.75 kg and the time of contact with the ball is 0.015 s, what is the force exerted by the ball on the kicker’s foot?
*Sunday, January 26, 2014 at 4:08pm*

**physics**

A barefoot ﬁeld-goal kicker imparts a speed of 33 m/s to a football initially at rest. If the football has a mass of 0.75 kg and the time of contact with the ball is 0.015 s, what is the force exerted by the ball on the kicker’s foot?
*Sunday, January 26, 2014 at 4:07pm*

**physics**

Voltage=12V. R1=2.0ohms and R2=4.0ohms. Find the power used by R2.
*Sunday, January 26, 2014 at 3:17pm*

**physics**

How do I find the magnitude from this data: theta_1 = 44.9 theta_2 = 146.1 A = 4.8 cm B = 8.7 cm
*Sunday, January 26, 2014 at 2:11pm*

**Physics**

A cannon ball is fired horizontally with a velocity of 50m/s from the top of a cliff 90m high,after how many seconds will it strike the plane at the foot of the cliff.at what distance from the foot of the cliff will it strike and with what velocity will it strike the ground.
*Sunday, January 26, 2014 at 9:59am*

**Physics**

A cannon ball is fired horizontally with a velocity of 50m/s from the top of a cliff 90m high,after how many seconds will it strike the plane at the foot of the cliff.at what distance from the foot of the cliff will it strike and with what velocity will it strike the ground.
*Sunday, January 26, 2014 at 9:59am*

**physics**

a bullet of mass 40g strikes a stationary wooden block of mass 6kg horizontally at 500m per second.the bullet goes through the block,and emerges from the other side at 200m per second.a)Calculate the velosity of the block once the bullet emerges from it?
*Sunday, January 26, 2014 at 8:48am*

**physics**

the resultant force due to action of four forces is f1 which is 100N, along the negative y-axis.three of the force are 250N,320 above the x-axis,100N,60 above the x-axis, 200N, 140 above the x-axis find the fourth force
*Sunday, January 26, 2014 at 7:15am*

**Physics**

What is the speed of a proton whose kinetic energy is 12.9 keV?
*Sunday, January 26, 2014 at 3:37am*

**PHYSICS PLEASE HELP**

A fire hose held near the ground shoots water at a speed of 6.5 m/s 1. At what angle(s) should the nozzle point in order that the water land 2.5 m away? -I believe the answer is 18,72 2. Sketch the trajectory for the 18; angle -Please give me exact (x,y coordinates) -I believe...
*Sunday, January 26, 2014 at 1:05am*

**physics**

An express subway train passes through an underground station. It enters at t = 0 with an initial velocity of 23.0 m/s and decelerates at a rate of 0.150 m/s2 as it goes through. The station in 210 m long. (a) How long is the nose of the train in the station? (b) How fast is ...
*Sunday, January 26, 2014 at 1:04am*

**physics**

using a powerful air gun, a steel ball is shot vertically upward with a velocity of 80 m/s, followed by another shot after 5 seconds. find the initial velocity of the second ball to meet the first ball 150 m from the ground.
*Saturday, January 25, 2014 at 6:41pm*

**physics**

A pilot wants the heading of an airplane to be 45º east of north. The wind is from 270º at 32 km/h, and the speed of the airplane through the air is 320 km/h. The pilot should maintain a heading of approximately?
*Saturday, January 25, 2014 at 5:29pm*

**physics**

A train, starting from rest, accelerates along the platform at a uniform rate of 0.6 m/s2. A passenger standing on the platform is 5 m away from the door when the train starts to pull away and heads toward the door at acceleration of 1.2 m/s2. How far away from the door is the...
*Saturday, January 25, 2014 at 5:26pm*

**physics**

A figure skater pushes off from rest and glides along a circular path, the radius of which is 3 times her height. What must be her minimum initial velocity in order to come full circle without having to push off a second time?
*Saturday, January 25, 2014 at 4:04pm*

**physics**

why is the pressure different in different areas of the chamber
*Saturday, January 25, 2014 at 1:37pm*

**Physics**

The internal energy of a gas is 585 J. The gas is compressed adiabatically, and its volume decreases by 137 cm3. If the pressure applied on the gas during compression is 2.65 atm, what is the internal energy of the gas after the adiabatic compression?
*Saturday, January 25, 2014 at 1:04pm*

**physics**

A)A model rocket is launched straight upward with an initial speed of 47.7 m/s. It accelerates with a constant upward acceleration of 2.02 m/s2 until its engines stop at an altitude of 157 m. What is the maximum height reached by the rocket? B)How long after lift off does the ...
*Saturday, January 25, 2014 at 12:00pm*

**physics**

A lighthouse that rises h1 = 47.0 ft above the surface of the water sits on a rocky cliff that extends d = 17.4 ft from its base, as shown in the figure below. A sailor on the deck of a ship sights the top of the lighthouse at an angle of theta = 29.3 degree above the ...
*Saturday, January 25, 2014 at 11:39am*

**physics**

A 0.20-kg object is attached to the end of an ideal horizontal spring that has a spring constant of 120 N/m. The simple harmonic motion that occurs has a maximum speed of 2.0 m/s. Determine the amplitude A of the motion.
*Saturday, January 25, 2014 at 11:23am*

**physics**

A bullet travelling with velocity of 100 ms-1 pierces a block of wood and moves with a velocity of 10 ms-1 . If the thickness of the block reduces to one half of the previous value, what wiil be the emerging velocity of the bullet?
*Saturday, January 25, 2014 at 11:01am*

**physics**

Data: theta_1 = 44.9 theta_2 = 146.1 A = 4.8 cm B = 8.7 cm A)What is the x component of vector A? B)What is the y component of vector A? C)What is the x component of vector B? D)What is the y component of vector B? E)What is the magnitude of vector (A + B)?
*Saturday, January 25, 2014 at 10:46am*

**physics**

Starting from the constant-acceleration kinematic equations, write a formula that gives xf in terms of t, xi, vf, and a.
*Saturday, January 25, 2014 at 10:31am*

**physics**

A) A hot air balloon has just lifted off and is rising at the constant rate of 1.70 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 10.4 m/s. If the passenger is 3....
*Saturday, January 25, 2014 at 10:08am*

**physics**

A 3 kg ball is traveling in a circle of radius 2 meters with a tangential velocity of 2 meters/second. Find the centripetal of the ball and the centripetal force acting on it.
*Saturday, January 25, 2014 at 10:05am*

**college physics**

a) A light-rail commuter train accelerates at a rate of 1.25 m/s2. How long does it take it to reach its top speed of 80.0 km/h starting from rest? (b) The same train ordinarily decelerates at a rate of 1.75 m/s2. How long does it take to come to a stop from its top speed? (c...
*Saturday, January 25, 2014 at 2:15am*

**college physics**

A bicycle racer sprints at the end of a race to clinch a victory. The racer has an initial velocity of 10.0 m/s and accelerates at the rate of 0.600 m/s2 for 7.00 s. (a) What is his final velocity? (b) The racer continues at this velocity to the finish line. If he was 300 m ...
*Saturday, January 25, 2014 at 2:14am*

**college physics**

A bicycle racer sprints at the end of a race to clinch a victory. The racer has an initial velocity of 10.0 m/s and accelerates at the rate of 0.600 m/s2 for 7.00 s. (a) What is his final velocity? (b) The racer continues at this velocity to the finish line. If he was 300 m ...
*Saturday, January 25, 2014 at 2:14am*

**college physics**

An express subway train passes through an underground station. It enters at t = 0 with an initial velocity of 23.0 m/s and decelerates at a rate of 0.150 m/s2 as it goes through. The station in 210 m long. (a) How long is the nose of the train in the station? (b) How fast is ...
*Saturday, January 25, 2014 at 2:10am*

**physics**

The coeﬃcient of linear expansion for a silver strip is 1.9 × 10−5 / ◦C. What is its length on a hot day when the temperature is 32◦C if the strip is 1.4 m long when it is −15◦C? Answer in units of m Your answer must be within ±...
*Friday, January 24, 2014 at 11:18pm*

**Physics**

A ball is thrown straight upward and rises to a maximum height of 20 m above its launch point. At what height above its launch point has the speed of the ball decreased to one-half of its initial value?
*Friday, January 24, 2014 at 7:23pm*

**Physics**

A hot-air balloon is rising upward with a constant speed of 2.20 m/s. When the balloon is 2.50 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?
*Friday, January 24, 2014 at 7:03pm*

**Physics**

A car is traveling at 16.0 m/s, and the driver sees a traffic light turn red. After 0.500 s (the reaction time), the driver applies the brakes, and the car decelerates at 8.00 m/s2. What is the stopping distance of the car, as measured from the point where the driver first ...
*Friday, January 24, 2014 at 6:46pm*

**Physics**

A jetliner, traveling northward, is landing with a speed of 60 m/s. Once the jet touches down, it has 795 m of runway in which to reduce its speed to 5.6 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the positive direction to...
*Friday, January 24, 2014 at 6:39pm*

**Physics 212**

Styrofoam has a density of 300kg/m3. What is the maximum mass that can hang without sinking from a 40.0cm -diameter Styrofoam sphere in water? Please help!
*Friday, January 24, 2014 at 5:16pm*

**Physics**

Two Ping-Pong balls each have a mass of 2.6g and carry a net charge of 0.500ìC . One ball is held fixed. At what height should the second ball be placed directly above the fixed ball if it is to remain at rest there? Express your answer to two significant figures and ...
*Friday, January 24, 2014 at 5:00pm*

**Physics**

A free electron and a free proton are exactly 0.70cm apart. Find the magnitude of the acceleration of the proton. Express your answer with the appropriate units. Find the direction of the acceleration of the proton. Find the magnitude of the acceleration of the electron. ...
*Friday, January 24, 2014 at 4:59pm*

**Physics**

Two small spheres spaced 20.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10 −21 newtons?
*Friday, January 24, 2014 at 4:57pm*

**Physics**

How much charge is contained in 9kg of protons? Express your answer to two significant figures and include the appropriate units.
*Friday, January 24, 2014 at 4:56pm*

**Physics**

How much charge is contained in 9kg of electrons? Express your answer to two significant figures and include the appropriate units.
*Friday, January 24, 2014 at 4:56pm*

**Physics**

An egg is thrown nearly vertically upward from a point near the cornice of a tall building. It just misses the cornice on the way down and passes a point a distance 37.0m below its starting point at a time 5.00 s after it leaves the thrower's hand. Air resistance may be ...
*Friday, January 24, 2014 at 4:49pm*

**physics**

In a certain right triangle, the two sides that are perpendicular to each other are 3.80 m and 8.10 m long. What is the length of the third side of the triangle?
*Friday, January 24, 2014 at 4:13pm*

**physics**

1. The acceleration due to gravity calculated this way works well for objects near the Earth’s surface. How would you have to change the above equation if the object was 100,000 meters above the ground? (Note: this question refers to Newton’s equation for the force ...
*Friday, January 24, 2014 at 2:54pm*

**Physics**

The figure gives the acceleration a versus time t for a particle moving along an x axis. The a-axis scale is set by as = 14.0 m/s2. At t = -2.0 s, the particle's velocity is 11.0 m/s. What is its velocity at t = 6.0 s?
*Friday, January 24, 2014 at 2:38pm*

**Physics**

You're an investigator for the National Transportation Safety Board, examining a subway accident in which a train going at 88km/h km/h collided with a slower train traveling in the same direction at 25km/h km/h . Your job is to determine the relative speed of the collision...
*Friday, January 24, 2014 at 12:28pm*

**AP Physics C**

One dimension. In the figure, two point particles are fixed on an x axis separated by distance d. Particle A has mass mA and particle B has mass 5.00 mA. A third particle C, of mass 62.0 mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at ...
*Friday, January 24, 2014 at 11:51am*

**physics**

A 76-cd point source of light is 3.2 m above the surface of a desk. What is the illumination on the desk's surface in lux?
*Thursday, January 23, 2014 at 11:32pm*

**physics**

A student wants to compare the luminous flux of a light bulb with that of a 1675 lm lamp. The light bulb and the lamp illuminate a sheet of paper equally. The 1675 lm lamp is 1.28 m away from the sheet of paper; the light bulb is 1.08 m away. What is the light bulb's ...
*Thursday, January 23, 2014 at 11:19pm*

**physics**

A load of 100 lb is hung from the middle of a rope, which is stretched between two rigid walls 30 ft apart. Due to the load, the rope sags 4 feet in the middle. Determine the tension on the rope.
*Thursday, January 23, 2014 at 10:24pm*

**Physics**

A 1.25kg book in space has a weight of 8.35N. What is the value of the gravitational field at that location ?
*Thursday, January 23, 2014 at 9:50pm*

**physics**

A girl with a mass of 83 kg is climbing in a tree 20 m above the ground. If she lands on a trampoline with a constant of 312 N/m, how far will the trampoline stretch and how fast will she be moving just prior to landing on it?
*Thursday, January 23, 2014 at 9:31pm*

**Physics**

As a baseball is being caught, it's speed goes from 30.0m/s to 0m/s in about 0.0050s. The mass of the baseball is 0.145kg A) what is the baseballs acceleration B) what are the magnitude and direction of the force acting on it? C) what is the magnitude and direction of the ...
*Thursday, January 23, 2014 at 9:30pm*

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