Thursday

June 30, 2016
**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 by Dee*

**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 by Anna*

**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 by Anon*

**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 by Bee*

**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 by kelly*

**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 by James*

**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 by James*

**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 by James*

**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 by James*

**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 by James*

**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 by James*

**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 by OwamIII *

**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 by Anji*

**Physics**

What is the frequency of a blue light with a wavelength of 489 nm
*Sunday, January 26, 2014 by Bob*

**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 by christopher*

**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 by Anonymous*

**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 by Nick*

**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 by Lyra*

**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 by Kimmy*

**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 by Need answer by 10pm*

**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 by Need answer by 10pm*

**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 by anonumous*

**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 by g*

**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 by Henry*

**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 by Henry*

**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 by gdx*

**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 by gdx*

**physics**

Voltage=12V. R1=2.0ohms and R2=4.0ohms. Find the power used by R2.
*Sunday, January 26, 2014 by Robert*

**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 by Tsion*

**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 by Temi*

**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 by Temi*

**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 by omphile*

**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 by Anonymous*

**Physics**

What is the speed of a proton whose kinetic energy is 12.9 keV?
*Sunday, January 26, 2014 by Anonymous*

**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 by PHYSICS*

**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 by Melissa*

**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 by Astro*

**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 by kjean*

**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 by kjean*

**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 by Shannon*

**physics**

why is the pressure different in different areas of the chamber
*Saturday, January 25, 2014 by Anonymous*

**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 by Kimmy*

**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 by Justin*

**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 by Sam*

**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 by Kate*

**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 by Ram*

**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 by Sam*

**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 by Ted*

**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 by Cat*

**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 by Anonymous*

**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 by Melissa*

**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 by Melissa*

**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 by Melissa*

**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 by Melissa*

**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 by chris*

**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 by Cara*

**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 by Sam*

**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 by Jon*

**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 by Maria*

**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 by Victoria*

**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 by James*

**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 by James*

**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 by James*

**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 by James*

**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 by James*

**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 by Hannah*

**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 by leslie*

**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 by Anika*

**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 by laken*

**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 by Tabitha*

**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 by Tabetha*

**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 by Felicia*

**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 by Felicia*

**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 by pinkmiming*

**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 by Sandara*

**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 by Marina*

**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 by Sandara*

**Physics**

Student A is on a 9m high bridge while Student B is on the ground. Student B throws an apple up to Student B with a velocity of 18m/s. How long does it take for the apple to reach student A's hand? if student A is unable to catch the apple, how long would it take for the ...
*Thursday, January 23, 2014 by Sandara*

**Physics**

Student A is on a 9m Hugh bridge while Student B is on the ground. Student B throws an apple up to Student B with a velocity of 18m/s. How long does it take for the apple to reach student A's hand? if student A is unable to catch the apple, how long would it take for the ...
*Thursday, January 23, 2014 by Sandara*

**physics**

A bomb is dropped out of a plane 100 m above the ground, how fast will it be moving when it hits the ground?
*Thursday, January 23, 2014 by Marina*

**physics**

a)Two cars are traveling along a straight line in the same direction, the lead car at 24.5m/s and the other car at 29.6m/s. At the moment the cars are 41.6m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.00m/s2. How long does it take ...
*Thursday, January 23, 2014 by Cat*

**physics**

A(n) 800 kg drag race car accelerates from rest to 103 km/h in 1.05 s. What average net force is exerted on the car?
*Thursday, January 23, 2014 by NADIA*

**physics**

The instant before a squishy ball of mass meets a horizontal floor and comes to rest in time ?t it has momentum p = p0 (ˆi −ˆj ) .What average force does the floor exert on the ball in order to stop it during this time interval?
*Thursday, January 23, 2014 by NADIA*

**Physics**

At time 9 s, a car with mass 1400 kg is lo- cated at <94m, 0 m, 30m> and has momentum <4500 kg · m/sec, 0 kg · m/sec,−3000 kg · m/sec> . The car’s momentum is not changing. At time 18 s, find the position of the car: ~d = <dx, dy...
*Thursday, January 23, 2014 by NADIA*

**Physics**

At time 9 s, a car with mass 1400 kg is lo- cated at <94m, 0 m, 30m> and has momentum <4500 kg · m/sec, 0 kg · m/sec,−3000 kg · m/sec> . The car’s momentum is not changing. At time 18 s, find the position of the car: ~d = <dx, dy...
*Thursday, January 23, 2014 by NADIA*

**physics**

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? How long after lift off does the ...
*Thursday, January 23, 2014 by cat*

**physics**

A 0.5 kg soccer ball is kicked with a force of 50 Newtons for 0.2 sec. The ball was at rest before the kick. What is the speed of the soccer ball after the kick?
*Thursday, January 23, 2014 by karen*

**physics**

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?
*Thursday, January 23, 2014 by sam*

**physics**

A 3kg ball is accelerated from rest to a speed of 10 m/s. What is the ball's change in momentum?
*Thursday, January 23, 2014 by karen*

**physics**

A net force of 100 newtons is applied to a 20 kg cart that is already moving at 3 meters per second. The final speed of the cart was 8 m/s. For how long was the force applied?
*Thursday, January 23, 2014 by karen*

**physics**

A 1,400kg car is traveling in a straight line. Its momentum is equal to 2,000 kg. What is the velocity of the car?
*Thursday, January 23, 2014 by karen*

**physics**

A beach ball rolling in a straight line toward you at a speed of 0.5 m/sec. Its momentum is 0.25kg m/sec. What is the mass of the beach ball?
*Thursday, January 23, 2014 by karen*

**physics**

A tennis ball has a mass of 0.057 kg. A professional tennis player hits the ball hard enough to give it a speed of 52 m/s (about 117 miles per hour.) The ball moves toward the left, hits a wall and bounces straight back to the right with almost the same speed (52 m/s). As ...
*Thursday, January 23, 2014 by Sandy*

**College Physics**

Assume that an MX missile goes from rest to a suborbital velocity of 4.50 km/s in 30.0 s (the actual speed and time are classified). What is its average acceleration in m/s2? What is its average acceleration in multiples of g?
*Thursday, January 23, 2014 by Melissa*

**college physics**

A commuter backs her car out of her garage with a constant acceleration of 1.20 m/s2. (a) How long does it take her to reach a speed of 1.60 m/s? s (b) If she then brakes to a stop in 0.8 s, what is her (constant) deceleration?
*Thursday, January 23, 2014 by Melissa*

**physics**

Water drips from a faucet into a flask at the rate of two drops every 3 seconds. A cubic centimeter contains 20 drops. What volume of water, in cubic decimeters will be collected in 1 hour?
*Thursday, January 23, 2014 by Sara*

**physics**

A baseball of mass 0.145 kg approaches a bat at 40.0 m/s. After it is hit, the ball leaves the bat at 50.0 m/s directly back. Find the impulse of the bat on the ball.
*Thursday, January 23, 2014 by Mackenzie*

**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 ...
*Thursday, January 23, 2014 by Leroy*

**physics**

A 0.55 kg block of ice is sliding by you on a very slippery floor at 4 m/s. As it goes by, you give it a kick perpendicular to its path. Your foot is in contact with the ice block for 0.0025 seconds. The block eventually slides at an angle of 23 degrees from its original ...
*Thursday, January 23, 2014 by Sandy*

**physics**

A 1.70 kg ball is attached to a ceiling by a 1.50 m long string. The height of the room is 3.36 m. The acceleration of gravity is 9.81 m/s2 . What is the gravitational potential energy associated with the ball relative to a) the ceiling? Answer in units of J b) the floor? ...
*Wednesday, January 22, 2014 by Jordan *