Sunday

December 21, 2014

December 21, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

A automobile travels at a speed of northward along a street, and a 7000-N sports car travels at a speed of eastward along an intersecting street. (a) If neither driver brakes and the cars collide at the intersection and lock bumpers, what will the velocity of the cars be ...
*Thursday, December 19, 2013 at 7:25pm*

**physics**

If an oxygen atom is 16 times more massive than an hydrogen atom, how much more massive is the "amount" of oxygen separated from any amount of water than the "amount" of hydrogen?
*Thursday, December 19, 2013 at 7:14pm*

**Physics 11 Forces Unit**

I'm not sure if my answers are correct. Your help will be greatly appreciated. Thanks in advanced! 1. two very large cruise ships each have a mass of 415000 tonnes. If they were docked side by side, 1.0m apart, their centres would be 60m apart. What is the force of ...
*Thursday, December 19, 2013 at 2:44pm*

**Physics AP**

A conical pendulum is formed by attaching a 50 g mass to a 1.2m string. The mass swings around a circle of radius 25cm. A claculate the speed of the mass. B Calculate the acceleration of the mass. C calculate the tension in the string
*Thursday, December 19, 2013 at 9:16am*

**physics**

1. Calculate the de Broglie wavelength in picometers (1 picometer =10^−12 meters) of an electron that has kinetic energy of 10 keV. The mass of an electron is 9.11 x 10^−31 kg 2. Winter is coming, so I want to make a 1500 W heating coil which will plug into a 120 V...
*Thursday, December 19, 2013 at 2:45am*

**physics**

A car accelerates from 0m/s to 51m/s with a displacement of 75 m. What is the car's acceleration
*Wednesday, December 18, 2013 at 11:57pm*

**physics**

A car accelerates from 0m/s to 51m/s with a displacement of 75 m. What is the car's acceleration
*Wednesday, December 18, 2013 at 11:56pm*

**physics**

A rock is moving through interstellar space towards a snow ball. Describe the motion of the rock until it hits the snow ball (in terms of Newton’s First Law). According to Newton’s 3rd Law, what will be the reaction to the force of the rock on the snow ball? How ...
*Wednesday, December 18, 2013 at 10:05pm*

**physics**

A straight copper wire that is 1 milimeter in diameter carries a current of 20 miliamps. Whas the magnitude of the largest magnetic field created by this wire in Tesla?
*Wednesday, December 18, 2013 at 9:26pm*

**PHYSICS**

A crate is pushed horizontally with a force. The acceleration of gravity is 9.8 m/s2 . Calculate the acceleration of the crate. Answer in units of m/s2 1570 N 198 kg μ = 0.44
*Wednesday, December 18, 2013 at 4:33pm*

**physics**

A 1900 kg car moves along a horizontal road at speed v0 = 26.4 m/s. The road is wet, so the static friction coefficient between the tires and the road is only μs = 0.17 and the kinetic friction coefficient is even lower, μk = 0.119. The acceleration of gravity is 9.8...
*Wednesday, December 18, 2013 at 4:23pm*

**physics**

A 61.3 kg astronaut is on a space walk when the tether line to the shuttle breaks. The astronaut is able to throw a 11.0 kg oxygen tank in a direction away from the shuttle with a speed of 10.6 m/s, propelling the astronaut back to the shuttle. Assuming that the astronaut ...
*Wednesday, December 18, 2013 at 4:00pm*

**physics**

A man of mass 60kg standing inside a lift with an acceleration of 2m/s(square).Find the apparent weight that a man feels(g is 10).
*Wednesday, December 18, 2013 at 2:49pm*

**PHYSICS URGENT HELP **

a charges electric potential energy within an electric field is calculated as the product of the ____ of it's position times the magnitude of it's charge
*Wednesday, December 18, 2013 at 10:49am*

**physics**

A thick metal slab carries a current I A uniform magnetic field B points perpendicular to the slab (and into the page). If point P on the slab is at a higher potential than point Q , what can we say about the charge carriers that produce the current in the slab? Need some help...
*Wednesday, December 18, 2013 at 7:06am*

**Physics and magnets**

A rectangular loop of wire of mass m and resistance R slides on a friction-free horizontal table. There is a region of uniform magnetic field perpendicular to the table. What type of graph best describes the speed v of the loop as a function of time?
*Wednesday, December 18, 2013 at 7:00am*

**physics and magnets**

A circular wire loop of mass M and radius R carries a current I . It hangs from a hinge that allows it to swing in the direction perpendicular to the plane of the loop. A uniform magnetic field B exists everywhere in space pointing upwards. What angle theta does the plane of ...
*Wednesday, December 18, 2013 at 6:54am*

**Physics**

When a given object moves a circular path, the centripetal force varies directly as the square of the velocity and inversely as the radius of the curve. If the force is 640lb for a velocity of 20mi/h and a radius of 5m, find the force for the velocity of 30mi/h and a radius of...
*Wednesday, December 18, 2013 at 4:14am*

**Physics**

A man stands on the roof of a building that is 50 m tall and throws a rock with a velocity of 35 m/s at an angle of 50 degrees above the horizontal (a) What is the total time in the air (b) What is the horizontal distance from the base of the building to the point where the ...
*Wednesday, December 18, 2013 at 3:50am*

**Physics**

A man stands on the roof of a building that is 50 m tall and throws a rock with a velocity of 35 m/s at an angle of 50 degrees above the horizontal (a) What is the total time in the air (b) What is the horizontal distance from the base of the building to the point where the ...
*Wednesday, December 18, 2013 at 3:47am*

**Physics**

When a given object moves a circular path, the centripetal force varies directly as the square of the velocity and inversely as the radius of the curve. If the force is 640lb for a velocity of 20mi/h and a radius of 5m, find the force for the velocity of 30mi/h and a radius of...
*Wednesday, December 18, 2013 at 1:56am*

**PHYSICS**

An electron is initially at rest in, but not on the axis of, a solenoid that is carrying a steady current I directed as shown in the cross section below (counterclockwise). The electron is initially at rest on the -x axis. The current in the solenoid is suddenly increased to ...
*Tuesday, December 17, 2013 at 9:51pm*

**physics**

As a projectile shot at an upward angle rises and falls what happens to its horizontal component of its velocity if we neglect air resistance?
*Tuesday, December 17, 2013 at 6:58pm*

**physics**

A 5g bullet is fired from a 5000g gun. If the bullet leaves the gun going +800m/s, with what speed does the gun recoil?
*Tuesday, December 17, 2013 at 6:36pm*

**PHYSICS**

A circular wire loop of mass M and radius R carries a current I . It hangs from a hinge that allows it to swing in the direction perpendicular to the plane of the loop. A uniform magnetic field B exists everywhere in space pointing upwards. What angle THETA does the plane of ...
*Tuesday, December 17, 2013 at 4:32pm*

**physics**

A circular wire loop of mass M and radius R carries a current I . It hangs from a hinge that allows it to swing in the direction perpendicular to the plane of the loop. A uniform magnetic field B exists everywhere in space pointing upwards. What angle THETA does the plane of ...
*Tuesday, December 17, 2013 at 3:57pm*

**Physics**

Mutiple choice: A car travelling at 10 m/s accelerates at 3 m/s^2. Its new velocity is A.) 12 m/s B.) 22m/s C.) 17 m/s D.) Can not be determined. Which of the following is not acceleration? A.) rate of change of speed in a particular direction B.) rate of change of motion in a...
*Tuesday, December 17, 2013 at 3:20pm*

**Physics multiple choice**

1. The normal force is always less than or equal to force of gravity a) True b) False 2. What is the value of the normal force? (there is an image of a box with a mass of 10kg and it is sitting on a flat horizontal surface) a) 98 N [up] b) 98 N [down] c) 10 N [up] d) 10 N [...
*Tuesday, December 17, 2013 at 12:36pm*

**Physics**

A stone is thrown vertically upward at a speed of 27.70 m/s at time t=0. A second stone is thrown upward with the same speed 2.140 seconds later. At what time are the two stones at the same height? At what height do the two stones pass each other? What is the downward speed of...
*Tuesday, December 17, 2013 at 11:57am*

**Physics**

A cork gun contains a spring whose spring constant is 18.0 N/m. The spring is compressed by a distance ∆X = 6.0 cm and used to propel a cork of mass 7.66 g from the gun. Assuming the cork is released when the spring passes through its equilibrium position (Xeq), what is ...
*Tuesday, December 17, 2013 at 11:56am*

**Physics**

A particle P travels with constant speed in a circle of radius 7.3 m and completes one revolution in 34.0 s (see Figure). The particle passes through O at t = 0 s. What is the magnitude of the average velocity during the interval from t = 11.9 s and t = 16.9 s. The answer here...
*Tuesday, December 17, 2013 at 11:55am*

**PHYSICS PLS HELP**

A circular wire loop of mass M and radius R carries a current I . It hangs from a hinge that allows it to swing in the direction perpendicular to the plane of the loop. A uniform magnetic field B exists everywhere in space pointing upwards. What angle theta does the plane of ...
*Tuesday, December 17, 2013 at 11:29am*

**Physics**

ANY ANSWERS WILL HELP! THANKS! 1. Isolated points of electric charge are called ____. 4b. ____ was the American physicist who first measured this fundamental unit of charge. 5. This type of electrification occurs when the charging rod touches an electroscope. 6. This type of ...
*Tuesday, December 17, 2013 at 11:22am*

**Physics**

an object at rest explodes into three pieces of equal mass. one moves east at 20 m/s a second moves southeast at 30 m/s what is the velocity of the third piece??
*Tuesday, December 17, 2013 at 8:39am*

**Physics**

A particle P travels with constant speed in a circle of radius 7.3 m and completes one revolution in 34.0 s (see Figure). The particle passes through O at t = 0 s. What is the magnitude of the average velocity during the interval from t = 11.9 s and t = 16.9 s. The answer here...
*Tuesday, December 17, 2013 at 7:26am*

**Physics**

A cork gun contains a spring whose spring constant is 18.0 N/m. The spring is compressed by a distance ∆X = 6.0 cm and used to propel a cork of mass 7.66 g from the gun. Assuming the cork is released when the spring passes through its equilibrium position (Xeq), what is ...
*Tuesday, December 17, 2013 at 7:23am*

**Physics**

A stone is thrown vertically upward at a speed of 27.70 m/s at time t=0. A second stone is thrown upward with the same speed 2.140 seconds later. At what time are the two stones at the same height? At what height do the two stones pass each other? What is the downward speed of...
*Tuesday, December 17, 2013 at 7:22am*

**physics**

plz help Two particles of mass m and M Undergo uniform circular motion about each other at a seperation R under the influence of an attractive force F . The angular velocity is w (Omega) radians per second. Show that R=(F/w)(1/m+ 1/M).
*Tuesday, December 17, 2013 at 7:02am*

**Physics**

The innerspring mattress on your grand- mother’s bed is held up by 23 vertical springs, each having a spring constant of 6000 N/m. A 43 kg person jumps from a 1.93 m platform onto the innersprings. The acceleration of gravity is 9.8 m/s2 . Assume: The springs were ...
*Monday, December 16, 2013 at 11:57pm*

**Physics**

An electron is released between two metal plates 40.0mm apart experiences an acceleration of 1x10^12m/s^2. Determine the potential difference across the plates.
*Monday, December 16, 2013 at 11:18pm*

**physics- multiple choice**

1. The normal force is always less than or equal to force of gravity a) True b) False 2. What is the value of the normal force? (there is an image of a box with a mass of 10kg and it is sitting on a flat horizontal surface) a) 98 N [up] b) 98 N [down] c) 10 N [up] d) 10 N [...
*Monday, December 16, 2013 at 11:14pm*

**Physics**

A thick metal slab carries a current I as shown. A uniform magnetic field B points perpendicular to the slab (and into the page). If point P on the slab is at a higher potential than point Q , what can we say about the charge carriers that produce the current in the slab? a....
*Monday, December 16, 2013 at 11:10pm*

**PHYSICS**

A circular wire loop of mass and radius carries a current . It hangs from a hinge that allows it to swing in the direction perpendicular to the plane of the loop. A uniform magnetic field exists everywhere in space pointing upwards. What angle does the plane of the loop make ...
*Monday, December 16, 2013 at 10:46pm*

**Physics**

A 68.0 kg ice skater moving to the right with a velocity of 2.55 m/s throws a 0.16 kg snowball to the right with a velocity of 27.5 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*Monday, December 16, 2013 at 10:39pm*

**Physics pls help**

Consider two single turn coils labeled 1 and 2 that are positioned close to each other. The switch S has been open for a long time. If the switch is now closed and the current through coil 1 is in the direction shown and increasing, which of the following statements is true? a...
*Monday, December 16, 2013 at 10:21pm*

**HO Physics**

A 68.0 kg ice skater moving to the right with a velocity of 2.55 m/s throws a 0.16 kg snowball to the right with a velocity of 27.5 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*Monday, December 16, 2013 at 10:18pm*

**Physics**

A 1.7 kg ball strikes a wall with a velocity of 7.7 m/s to the left. The ball bounces off with a velocity of 6.5 m/s to the right. If the ball is in contact with the wall for 0.17 s, what is the constant force exerted on the ball by the wall?
*Monday, December 16, 2013 at 10:02pm*

**physics**

A 68.0 kg ice skater moving to the right with a velocity of 2.55 m/s throws a 0.16 kg snowball to the right with a velocity of 27.5 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*Monday, December 16, 2013 at 10:02pm*

**physics. HELP**

A water balloon is thrown into the air and lands 30.0 meters away 1.8 seconds later. a. What was the speed of the balloon thrown (on the diagonal) b. At what angle was the balloon thrown with respect to the ground?
*Monday, December 16, 2013 at 8:14pm*

**physics. HELP**

A person has the ability to jump with an initial speed of 6.0 m/s at an angle of 35 degree with the ground. a. How long will the person be in the air? b. How far horizontally will the person travel?
*Monday, December 16, 2013 at 8:13pm*

**physics. HELP**

An athlete executing a long jump, leaves the ground at a 30 degree angle with the ground and travels 8.90 meters horizontally in 1.1 seconds. What was the takeoff speed of the athlete along the diagonal?
*Monday, December 16, 2013 at 8:13pm*

**physics. HELP**

A projectile is launched horizontally with a speed of 80.0 m/s. If the projectiles is launched above the floor, how long does it take the projectile to hit the floor?
*Monday, December 16, 2013 at 8:13pm*

**physics. HELP**

A projectile is launched horizontally with a speed of 80.0 m/s. If the projectiles is launched above the floor, how long does it take the projectile to hit the floor?
*Monday, December 16, 2013 at 8:12pm*

**physics**

A water balloon is thrown into the air and lands 30.0 meters away 1.8 seconds later. a. What was the speed of the balloon thrown (on the diagonal) b. At what angle was the balloon thrown with respect to the ground?
*Monday, December 16, 2013 at 7:15pm*

**Physics Elena Help pls**

An infinitely long wire carries a current I=100amp . Below the wire a rod of length L=10cm is forced to move at a constant speed v=5m/s along horizontal conducting rails. The rod and rails form a conducting loop. The rod has resistance of R=0.4 ohms . The rails have neglibible...
*Monday, December 16, 2013 at 7:14pm*

**physics**

A person has the ability to jump with an initial speed of 6.0 m/s at an angle of 35 degree with the ground. a. How long will the person be in the air? b. How far horizontally will the person travel?
*Monday, December 16, 2013 at 7:13pm*

**physics**

An athlete executing a long jump, leaves the ground at a 30 degree angle with the ground and travels 8.90 meters horizontally in 1.1 seconds. What was the takeoff speed of the athlete along the diagonal?
*Monday, December 16, 2013 at 7:11pm*

**physics**

A hunter aims directly at a target (on the same level) 170 meters away. If the bullet leaves the gun with a speed of 40 m/s, by how much will it miss the target? i.e. What is the vertical drop of the bullet?
*Monday, December 16, 2013 at 7:09pm*

**Physics PLs DAMON HELP**

A thick metal slab carries a current I as shown. A uniform magnetic field B points perpendicular to the slab (and into the page). If point P on the slab is at a higher potential than point Q , what can we say about the charge carriers that produce the current in the slab? a....
*Monday, December 16, 2013 at 5:26pm*

**physics/precalculus**

3) A wind with a speed of 60 km/h is directed TOWARDS the SE. A plane, flying due NORTH has an airspeed of 280 m/s. What is the speed (in compass notation) the plane is actually travelling as seen by an air traffic controller on the ground?
*Monday, December 16, 2013 at 5:06pm*

**physics/precalculus**

Starting from the drop off point, you hike in the woods 1.20 km due EAST. You then continue 3.0 km S 30° E. Finally, you head 2.0 km S 20° W. From the drop off point, where (in Compass notation) are you?
*Monday, December 16, 2013 at 5:03pm*

**Physics Help pls**

Consider two single turn coils labeled 1 and 2 that are positioned close to each other. The switch S has been open for a long time. If the switch is now closed and the current through coil 1 is in the direction shown and increasing, which of the following statements is true? a...
*Monday, December 16, 2013 at 4:35pm*

**physics**

A 2.0 kg rock is dropped from the top of a building. I lands 14.0 seconds later. How tall was the building?
*Monday, December 16, 2013 at 1:09pm*

**Check Answers Quick -Physics**

What causes the centripetal acceleration of an electron in a hydrogen atom? electrical attraction gravity friction <-- tension Question 2. Which of the following terms might a jet pilot use to describe a force that presses him against his seat during a high-speed turn? ...
*Monday, December 16, 2013 at 12:37pm*

**physics**

a worker pushes a 1420 N crate with a horizontal force of 420 N a distance of 27m. assume the coefficient between the crate and the floor is 0.22. what is the net force done on the crate?
*Monday, December 16, 2013 at 11:08am*

**physics**

An automobile moving at a constant velocity of 15 m/s passes a gasoline station. Two seconds later, another automobile leaves the station and accelerates at a constant rate of 2 m/s^2 in the same direction as the 1st automobile. How soon does the 2nd automobile overtake the ...
*Monday, December 16, 2013 at 4:36am*

**Physics**

Two thin, infinitely long, parallel wires are lying on the ground a distance d=3cm apart. They carry a current I_0=200A going into the page. A third thin, infinitely long wire with mass per unit length lambda=5g/m carries current I going out of the page. What is the value of ...
*Monday, December 16, 2013 at 1:21am*

**Physics**

A villain is knocked out of a low-flying aircraft by a heroic scientist-adventurer at an altitude of 370 m. After falling for 120 m the villain reaches terminal velocity. 7.16 seconds after reaching terminal velocity, the villain crash lands in a river full of piranha. If the ...
*Sunday, December 15, 2013 at 11:02pm*

**Physics**

A spring (k=302 N/m) placed vertically on a surface has a 548 g ball placed on top of it. How far must the spring be compressed in order for the ball to be traveling at a speed of 2.8 m/s when it is located 438 cm above its initial position?
*Sunday, December 15, 2013 at 11:01pm*

**Physics**

A spring (k=302 N/m) placed vertically on a surface has a 548 g ball placed on top of it. How far must the spring be compressed in order for the ball to be traveling at a speed of 2.8 m/s when it is located 438 cm above its initial position?
*Sunday, December 15, 2013 at 10:58pm*

**PHYSICS**

Consider two single turn coils labeled 1 and 2 that are positioned close to each other. The switch S has been open for a long time. If the switch is now closed and the current through coil 1 is in the direction shown and increasing, which of the following statements is true? a...
*Sunday, December 15, 2013 at 10:01pm*

**PHYSICS**

Two thin, infinitely long, parallel wires are lying on the ground a distance d=3cm apart. They carry a current I_0=200A going into the page. A third thin, infinitely long wire with mass per unit length lambda=5g/m carries current I going out of the page. What is the value of ...
*Sunday, December 15, 2013 at 5:35pm*

**physics**

A neutron star and a black hole are 5.650e+12 m from each other at a certain point in their orbit. The neutron star has a mass of 2.78×1030 kg and the black hole has a mass of 9.94×1030 kg.
*Sunday, December 15, 2013 at 5:21pm*

**PHYSICS**

An electron is initially at rest in, but not on the axis of, a solenoid that is carrying a steady current I directed as shown in the cross section below. The electron is initially at rest on the -x axis. The current in the solenoid is suddenly increaed to 2I. In what direction...
*Sunday, December 15, 2013 at 5:11pm*

**physics**

A neutron star and a black hole are 5.650e+12 m from each other at a certain point in their orbit. The neutron star has a mass of 2.78×1030 kg and the black hole has a mass of 9.94×1030 kg. What is the magnitude of the gravitational attraction between the two?
*Sunday, December 15, 2013 at 5:06pm*

**physics**

A stone is thrown vertically upward at a speed of 27.70 m/s at time t=0. A second stone is thrown upward with the same speed 2.140 seconds later. At what time are the two stones at the same height? At what height do the two stones pass each other? What is the downward speed of...
*Sunday, December 15, 2013 at 4:44pm*

**physics**

a camera drops off a 350m high cliff on mars where the acceleration is -3.7m/s^2. how fast is the camera going when it hits the ground?
*Sunday, December 15, 2013 at 4:29pm*

**Physics**

A person is standing at the top of a 58.0m tall hill. He stumbles and falls.As he rolls down the hill, magically friction has no effect on him! When he is still 25.0m above the base of the hill determine how fast he is moving.
*Sunday, December 15, 2013 at 3:21pm*

**physics**

rectangular loop of wire of mass and resistance slides on a friction-free horizontal table. There is a region of uniform magnetic field perpendicular to the table as shown. what type of graph will descfibe the speed of the loop as a function of time?
*Sunday, December 15, 2013 at 3:10pm*

**Physics/Calculus**

A spherical oil tank with a radius of 10 feet is half full of oil that weighs 60 pounds per cubic foot. Its top is 6 feet underground. How much work is needed to pump the oil out of the tank through a hole in its top? How do I solve this? Does the fact that it its top is 6 ...
*Sunday, December 15, 2013 at 12:24pm*

**Physics**

A children merry go round in the consist of 300 kg solid horizontal disk of radius 8.5 m. It rotates at a speed of .25 revolution per second while a person of mass 150 km takes a ride at the edge of the disk. How fast will the disk be rotating if the person walks 4m along the ...
*Saturday, December 14, 2013 at 11:16pm*

**PHYSICS**

A closed loop carrying a current I lies in the xy plane. A uniform magnetic field is directed along the positive y axis. Which of the following statements best describes the total magnetic force on the current loop? a)The total magnetic force is proportional to the area the ...
*Saturday, December 14, 2013 at 7:31pm*

**physics Classical Mechanics**

a) Two pendulums consist of a very thin string at the end of which hangs a mass which is much larger than the mass of the rod. In pendulum #1, the rod is made of copper. In pendulum #2, the rod is made of invar. What is the percentage in the period of the pendulums when the ...
*Saturday, December 14, 2013 at 12:09pm*

**physics**

Helium balloons are used regularly in scientific research. A typical balloon would reach an altitude of 45.0 km with an air density of 4.3×10−3 kg/m3. At this altitude the helium in the balloon would expand to 540000.0 m3. Take g=10 m/s2. Find the buoyant force on ...
*Saturday, December 14, 2013 at 6:40am*

**physics**

A cylindrical bucket has a small hole at the bottom. The water exiting the hole has velocity v. What is the depth, h, of the water in the bucket? h=
*Saturday, December 14, 2013 at 6:39am*

**physics**

A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 40.0 cm, and the constriction has a diameter of 10.0 cm. The two vertical pipes are open at the top, and the difference in water level between them is 2.0 m. Find ...
*Saturday, December 14, 2013 at 6:32am*

**physics**

Have a hoop (15kg) with a radius of 1.5m. Angular speed is 5 rad/s. What is the total KE possessed by the hoop? The hoop begins to climb an incline which is at a 15 degree angle. Measured along the incline, how far up the incline does it rool before stopping if the incline has...
*Saturday, December 14, 2013 at 12:51am*

**physics**

A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc and the floor. What ...
*Friday, December 13, 2013 at 7:06pm*

**physics**

A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc and the floor. What ...
*Friday, December 13, 2013 at 7:05pm*

**physics-important fast**

A 1532.9 kg car traveling with a speed of 12.7 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50.4 m?
*Friday, December 13, 2013 at 2:01pm*

**physics**

Suppose you are riding a stationary exercise bicycle, and the electronic meter indicates that the wheel is rotating at 9.1 rad/s and that you have been riding for a "distance" of 8.6 x 103m. The wheel has a radius of 0.45 m. For how many minutes have you been riding ...
*Friday, December 13, 2013 at 1:48pm*

**Physics-urgent**

A speeder is driving down the road at a constant 20 m/s, he passes a patrolman parked on the roadside. The patrolman waits 3 seconds, then pursues the speeder, accelerating at a constant 4.0 m/s. How long does it take the patrolman to catch the speeder? How far has he traveled...
*Friday, December 13, 2013 at 11:20am*

**physics**

A 1.13 kg skateboard is coasting along the pavement at a speed of 4.28 m/s when a 0.93 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination?
*Thursday, December 12, 2013 at 11:58pm*

**pHYSICS HELP!**

A tennis player places a 44 kg ball machine on a frictionless surface, as shown below. The machine fires a 0.064 kg tennis ball horizontally with a velocity of 35.2 m/s toward the north. What is the final velocity of the machine?
*Thursday, December 12, 2013 at 11:44pm*

**physics**

When the net force that acts on a hockey puck is 12 N, the puck accelerates at a rate of 48 m/s2. Determine the mass of the puck.
*Thursday, December 12, 2013 at 11:24pm*

**Physics**

A ball has an initial velocity of -23m/s. If the ball has a new velocity of 76m/s after 27 seconds, what is the ball acceleration
*Thursday, December 12, 2013 at 11:23pm*

**PHYSICS HELP!**

An 88.5 kg fullback moving east with a speed of 5.5 m/s is tackled by a 94.0 kg opponent running west at 2.90 m/s, and the collision is perfectly inelastic. (a) Calculate the velocity of the players just after the tackle. m/s (b) Calculate the decrease in kinetic energy during...
*Thursday, December 12, 2013 at 10:40pm*

**physics HELP!**

A 4.0 g coin sliding to the right at 26.0 cm/s makes an elastic head-on collision with a 12.0 g coin that is initially at rest. After the collision, the 4.0 g coin moves to the left at 13 cm/s. (a) Find the final velocity of the other coin. cm/s (b) Find the amount of kinetic ...
*Thursday, December 12, 2013 at 10:39pm*

**PHYSICS HELP!**

A 73.5 kg ice skater moving to the right with a velocity of 2.64 m/s throws a 0.18 kg snowball to the right with a velocity of 23.8 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*Thursday, December 12, 2013 at 10:38pm*

**physics**

A 0.20 kg baseball moving at +25.20 m/s is slowed to a stop by a catcher who exerts a constant force of -387 N. A)How long does it take this force to stop the ball? B)How far does the ball travel before stopping?
*Thursday, December 12, 2013 at 10:37pm*

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