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Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
What is the angle of refraction of a light ray that enters the surface of a calm lake from air at an angle of 45 degrees to the normal? The refractive index of water is 1.333. 32.04 45.00 59.99 33.76 I was thinking A or D
Wednesday, October 31, 2012 at 11:24am

Physics
Which of the following statements is not true about refraction? Refraction occurs when light's velocity changes. The angle between the refracted ray and the normal is called the angle of refraction. When light moves from a rarer to a denser medium, it bends toward the ...
Wednesday, October 31, 2012 at 11:17am

Physics
Light cannot be linearly polarized by: transmission reflection diffraction diffraction I would think reflection...?
Wednesday, October 31, 2012 at 11:16am

Physics
An object is dropped from a cliff thatis 256 m above the sea. just prior to splashing into the water, how fast is it going? How long did it take to fall?
Wednesday, October 31, 2012 at 10:44am

physics
State keplers law of planetary motion
Wednesday, October 31, 2012 at 10:33am

physics
State law of orbit?
Wednesday, October 31, 2012 at 10:32am

Intergated chemistry/physics
Draw a setup containing 3 gears. For every turn of the input gear, you need the output gear to spin 9 times. The drawing doesn't have to be perfect, but make sure to label the input gear, the output gear, and the number of teeth on each gear. Please E-mail me the picture ...
Wednesday, October 31, 2012 at 9:59am

physics ..PLEASE HELP ASSIGN DUE SOON :(
an object on an inclined ramp of mass 1.39kg. The angle of the inclined surface is 29deg with the horizontal. The object on the ramp is connected to a second object of mass 2.17kg on a horizontal surface below an overhang that is formed by the inclined surface. Further, an ...
Wednesday, October 31, 2012 at 9:42am

physics
An object with a mass of 3.4 kg is originally at rest on a horizontal, frictionless surface frictionless which is at the top of a frictionless incline with a length of 6 meters which is inclined at 28.9 degrees. Someone's hand applies a force to the object over some ...
Wednesday, October 31, 2012 at 9:26am

physics
A mass of 2.9 kg is hanging vertically from a string with a length of 2.4 meters. It is then raised to an angle of 50 degrees with the vertical and given some velocity, v. If the string breaks at a tension of 163.8 Newtons, what is the maximum value for v such that the string ...
Wednesday, October 31, 2012 at 9:23am

physics
An object of mass 26 kg is thrown straight upwards from the ground at 27 m/s. Due to air resistance (a non-conservative force), the object loses some of its initial energy during its trip to reach maximum height and only travels to a height above the ground of 16.3 meters. ...
Wednesday, October 31, 2012 at 9:22am

Physics HELP!!
A 7.37kg fish is held by a taut string. If the fish is accelerated upward at a rate of 3.62m/s^2, what would be the tension in the string?
Wednesday, October 31, 2012 at 8:29am

Physics HELP!!
two horizontal forces F1 and F2, acting on an object of mass 1.11kg. The magnitude of F1 is 27.56N. The object moves strictly along the horizontal x-axis, which we choose as positive to the right. Find the magnitude of F2 if the object has a horizontal acceleration of 8.4m/s^2...
Wednesday, October 31, 2012 at 8:28am

physics
A spherical generator is used to produce a -15.00D surface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens?
Wednesday, October 31, 2012 at 5:40am

PHYSICS
A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. The combined mass swings up to a height of 10.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision? The Ans is 0.707 kg m/sec I do not know how ...
Wednesday, October 31, 2012 at 2:48am

PHYSICS
A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. The combined mass swings up to a height of 10.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision?
Wednesday, October 31, 2012 at 2:40am

Physics
A 46.4-N force is applied to the outer edge of a door of width 1.26 m in such a way that it acts (a) perpendicular to the door (b) at an angle of 43.0 degrees with respect to the door surface, (c) so that the line of action of the force passes through the axis of the door ...
Tuesday, October 30, 2012 at 11:16pm

Physics
What would be the final temperature of a mixture of 80 g of 25 c water and 150 g of water at 75 c?
Tuesday, October 30, 2012 at 10:55pm

Physics
A ball rolls off a tabletop 0.900 m above the floor and lands on the floor 2.60 m away from a point that is directly under the edge of the table. At what speed did the ball roll off of the table? I would really appreciate it if someone could explain to me how the problem is ...
Tuesday, October 30, 2012 at 10:50pm

physics
If a cat chases a mouse for 1.15 s whail covering a distance of 19.6 m, what is the velocity?
Tuesday, October 30, 2012 at 10:12pm

Physics
Traveling at a speed of 15.9 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 0.700. What is the speed of the automobile after 2.00 s have elapsed? Ignore the effects of ...
Tuesday, October 30, 2012 at 10:02pm

Intro to Physics
A uniform hoop and a disk, having the same mass and the same radius, are released simultaneously from rest at the top of a ramp. Which object reaches the bottom of the ramp first? The ramp is 1.0meter high. The incline of the plane is 30 degrees. Assume no friction. Show ...
Tuesday, October 30, 2012 at 9:41pm

Physics
If a disk and hoop are released simutaneously 1.0m above the ground at a 30 degree incline which one will reach the bottom faster? Show mathematically.
Tuesday, October 30, 2012 at 9:33pm

Physics
A bicycle has wheels of radius 0.32 m. Each wheel has a roatational inertia of 0.080 kg•m^2 about its axle. The total mass of the bicycle including the wheels and the rider is 79 kg. When coasting at constant speed, what fraction of the total kinetic energy of the bicycle...
Tuesday, October 30, 2012 at 8:17pm

Physics
A(n) 95.7 kg boxer has his first match in the Canal Zone with gravitational acceler- ation 9.782 m/s2 and his second match at the North Pole with gravitational accelera- tion 9.832 m/s2. a) What is his mass in the Canal Zone? Answer in units of kg b) What is his weight in the ...
Tuesday, October 30, 2012 at 7:40pm

Physics
The block pictured below is sliding upward on the incline with theta=25. the coefficient of friction between the block and the incline is 0.15. of the block has a speed of 5 m/s at the bottom of the incline, how far upward will it slide before it stops? I've got a few ...
Tuesday, October 30, 2012 at 7:39pm

Physics
A(n) 95.7 kg boxer has his first match in the Canal Zone with gravitational acceler-ation 9.782 m/s2 and his second match at the North Pole with gravitational accelera- tion 9.832 m/s2.
Tuesday, October 30, 2012 at 7:35pm

Physics
A person is riding a bicycle, and its wheels have an angular velocity of 17.7 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is 12.4 revolutions. (a) How much time does it take for the bike ...
Tuesday, October 30, 2012 at 7:18pm

Physics
An object m is released from the top of an inclined, frictionless plane that is inclined at angle theta with the horizontal. The top of the ramp has height h. Which of the following would change the acceleration of the object if it were released from the top of the ramp? a) ...
Tuesday, October 30, 2012 at 7:06pm

Physics
An object turns without changing its speed. Which of the following is true? a) No net force was necessarily acting on the object b) A new force must have been acting on the object. c) Both of the answers above are possible I'm thinking that the answer is b) because of the ...
Tuesday, October 30, 2012 at 6:57pm

Physics
At planet X, there is another planet called Y about 34 million light years away. The radius of planet X is 1 * 10^9 m. How far away from the center of the planet X is the planet Y in meters?
Tuesday, October 30, 2012 at 6:36pm

Physics
A boy wishes to throw a rock into the river below the cliff where he is standing. The cliff is 50 M high and he can throw with a horizontal velocity of 30 m/s. how long does it take for the rock to reach the water? How far, in the horizontal direction, does the rock land?
Tuesday, October 30, 2012 at 6:00pm

Physics
A star rotates in a circular orbit about the center of its galaxy. The radius of the orbit is 6.2 x 1020 m, and the angular speed of the star is 4.3 x 10-15 rad/s. How long (in years) does it take for the star to make one revolution around the center?
Tuesday, October 30, 2012 at 5:54pm

college physics
A cruise ship of seniors is moving due west with an engine speed of 60km/hr when it encounters a current from the North at 20Km/hr. What is its relative velocity due to this current? (speed and angle) What course correction does it need to continue due west? (new angle and ...
Tuesday, October 30, 2012 at 5:42pm

college physics
A cannonball shot at an angle of 60 Degrees had a range of 196m. What was its initial speed?
Tuesday, October 30, 2012 at 5:39pm

college physics
A 3rd baseman is throwing a ball to 1st base which is 39.0m away. It leaves his hand at 38.0m/s at a height of 1.50m from the ground and makes an angle of 20 Degrees. How high will it be when it gets to 1st base.
Tuesday, October 30, 2012 at 5:38pm

college physics
A ball is thrown from a 20.0m high building and hits the ground 6.0m from the building. With what horizontal velocity was it thrown?
Tuesday, October 30, 2012 at 5:35pm

physics
Use energy methods to find the speed of a 2.0-kg block just before it hits the flor if the coefficent of kinetic energy of the 3.0-kg block and the table is 0.15m
Tuesday, October 30, 2012 at 5:21pm

physics
A 67.5 kg hoop rolls along a horizontal floor so that its center of mass has a speed of 0.090 m/s. How much work must be done to stop it?
Tuesday, October 30, 2012 at 4:50pm

Physics
The escape velocity on Planet X is the speed the rocket needs in order to never fall back down again in a universe in which X is the only object. In order for the rocket to not fall back down, its velocity to never become negative, how far away does the rocket have to be when ...
Tuesday, October 30, 2012 at 4:38pm

Physics
Supposed that you are on a planet, which has an average radius 1*10^9m and average density 7.4kg/m^3. Assuming that it's a perfect sphere, find the mass of the planet.
Tuesday, October 30, 2012 at 4:01pm

Physics- Elena please help!
A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 21.0° with the horizontal. A 37.0 kg piece of luggage is placed on the ...
Tuesday, October 30, 2012 at 3:56pm

physics
A spherical generator is used to produce a -15.00D surface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens?
Tuesday, October 30, 2012 at 3:05pm

Physics Inertia!
Rank from fastest to slowest. a)a solid ball rolling down a ramp without slipping b)a cylinder rolling down the same ramp without slipping. c)a block sliding down a firctionless ramp with the same height and slope. Select all that apply. The ball is fastest The cylinder is ...
Tuesday, October 30, 2012 at 2:45pm

physics
Starting from rest, a 75 kg skier slides down a 17.0° slope. If the coefficient of kinetic friction between the skis and snow is 0.120 and it takes 16.9 s to get to the bottom, how long is the ski trail? (Use g = 9.8 m/s2.)
Tuesday, October 30, 2012 at 1:48pm

Physics
You are working out on a rowing machine. Each time you pull the rowing bar (which simulates the oars) toward you, it moves a distance of 1.2 m in a time of 1.4 s. The readout on the display indicates that the average power you are producing is 78 W. What is the magnitude of ...
Tuesday, October 30, 2012 at 1:42pm

Physics
Which of the following statements are true? Select all that apply. Impulse has units of mass times velocity. During a collision, an object's linear momentum is equal to the magnitude of the impulse. The impulse of a collision is equal to the duration of the collision ...
Tuesday, October 30, 2012 at 1:41pm

physics
An object's velocity vector and linear momentum vector are always... a)parallel b)anti-parallel c)perpendicular d)none of the above
Tuesday, October 30, 2012 at 1:39pm

College Physics
At t=0 the current to a dc electric motor is reversed, resulting in an angular displacement of the motor shaft given by theta(t)= 258t - 20.4t^2 - 1.47t^3 How many revolutions does the motor shaft turn through between the time when the current is reversed and the instant when ...
Tuesday, October 30, 2012 at 1:24pm

college physics
When the displacement of a mass on a spring is one half of the amplitude of its oscillation, what fraction of the total energy is kinetic energy?
Tuesday, October 30, 2012 at 1:22pm

Physics- Can someone please help me!!!
A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 21.0° with the horizontal. A 37.0 kg piece of luggage is placed on the ...
Tuesday, October 30, 2012 at 12:34pm

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
Tuesday, October 30, 2012 at 12:25pm

physics
A uniform rod of mass M = 0.245kg and length L = 0.49m stands vertically on a horizontal table. It is released from rest to fall. (a) Calculate the angular speed of the rod, the vertical acceleration of the moving end of the rod, and the normal force exerted by the table on ...
Tuesday, October 30, 2012 at 11:30am

Nuclear Physics
Consider an alpha particle with kinetic energy E_ (alpha) which is incident on a material. Show that the distance traveled, ∆x, by the alpha particle after it has lost an amount of energy ∆E, in the material, can be found by the following equation: ∆x=Range (...
Tuesday, October 30, 2012 at 11:17am

Nuclear Physics
Consider an alpha particle with kinetic energy E_ (alpha) which is incident on a material. Show that the distance traveled, ∆x, by the alpha particle after it has lost an amount of energy ∆E, in the material, can be found by the following equation: ∆x=Range (...
Tuesday, October 30, 2012 at 11:15am

Physics
During a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward force of 148 N on the wire. The left section of the wire makes an angle of 12° relative to the ...
Tuesday, October 30, 2012 at 2:36am

Physics
"A slinky that satisfies v = sqrt(T/_mu) is stretched 12m. The mass of the slinky is 0.8kg. The tension on the slinky is 4N. What is the expected wave speed?" To get mu, I divided the mass by the length then plugged that into the equal and solved for v but I'm ...
Tuesday, October 30, 2012 at 1:53am

Physics
The drawing shows three particles far away from any other objects and located on a straight line. The masses of these particles are mA = 363 kg, mB = 517 kg, and mC = 154 kg. Find the magnitude and direction of the net gravitational force acting on each of the three particles...
Tuesday, October 30, 2012 at 1:50am

physics
The space probe Deep Space I was launched on October 24, 1998. It's mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of time with the ...
Tuesday, October 30, 2012 at 1:35am

physics
Child X throws 0.5 kg of Play Dough at Child Y at 0.40 m/s at the same time that Child Y throws 0.8 kg of Play Dough at Child X at 0.20 m/s. The two masses of Play Dough collide and stick. What is the resulting speed and direction of the Play Dough? What are the kinetic ...
Tuesday, October 30, 2012 at 1:15am

Physics
Consider a stainless steel annular disk with an outer radius 68mm and inner radius7.4mm. The mass of the disk is 1349 grams. The stainless steel annular disk is allowed to rotate on a frictionless table with the rotation axis at its center. The disk has a small cylinder ...
Tuesday, October 30, 2012 at 12:45am

Physics
Consider a stainless steel annular disk with an outer radius 68mm and inner radius7.4mm. The mass of the disk is 1349 grams. The stainless steel annular disk is allowed to rotate on a frictionless table with the rotation axis at its center. The disk has a small cylinder ...
Tuesday, October 30, 2012 at 12:45am

Physics- Someone Please Help!!!
A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 21.0° with the horizontal. A 37.0 kg piece of luggage is placed on the ...
Monday, October 29, 2012 at 11:31pm

Physics
An electric motor is used to pull a 125 kg box across a floor using a long cable. the tension in the cable is 350N and the box accelerates at 1.2m/s^2[forward] for 5.0s. The cable breaks and the box slows down and stops. How far does the box travel from the moment the cable ...
Monday, October 29, 2012 at 10:43pm

Physics
An electric motor is used to pull a 125 kg box across a floor using a long cable. the tension in the cable is 350N and the box accelerates at 1.2m/s^2[forward] for 5.0s. The cable breaks and the box slows down and stops. How far does the box travel from the moment the cable ...
Monday, October 29, 2012 at 10:43pm

physics
Jeff of the Jungle swings on a vine that is r = 6.40 m long. At the bottom of the swing, just before hitting a tree, Jeff's linear speed is 7.10 m/s.
Monday, October 29, 2012 at 10:20pm

AP Physics
A 1200 kg car is moving at 33 m/s then has the brakes applied at a deceleration of 6.1 m/s. How far will it move before stopping?
Monday, October 29, 2012 at 10:09pm

physics
12.5 kg wooden crate with an initial velocity of 2.5 m/s slides across a rough cement floor for 1.7 m before coming to rest. Calculate the coefficient of kinetic friction
Monday, October 29, 2012 at 9:32pm

physics
A 1500-N uniform boom at = 61.0° to the horizontal is supported by a cable at an angle θ = 29.0° to the horizontal as shown in the figure below. The boom is pivoted at the bottom, and an object of weight w = 2350 N hangs from its top.
Monday, October 29, 2012 at 9:30pm

physics
A traffic light hangs from a pole as shown in the figure(Figure 1) . The uniform aluminum pole AB is 7.50 long and has a mass of 15.0 . The mass of the traffic light is 23.5 . Determine the tension in the horizontal massless cable CD. Determine the vertical and horizontal ...
Monday, October 29, 2012 at 9:30pm

Physics ~ A 2.0-kg ball is
A 2.0-kg ball is travelling east at 8.0 m/s when it has a perfectly elastic head-on collision with a 3.0-kg ball traveling west at 10.0 m/s. What are the final velocities of the two balls?
Monday, October 29, 2012 at 8:59pm

AP Physics C
An electron follows a helical path in a uniform mag-netic field of magnitude 0.300 T. The pitch of the path is 6.00 um, and the magnitude of the magnetic force on the elec-tron is 2.00x10^-15 N. What is the electron's speed?
Monday, October 29, 2012 at 8:44pm

Momentum ~ Physics
A 25-g bullet is fired at 150 m/s into a 2.0-kg block of wood hanging from a string 3.0 m long. The bullet becomes imbedded in the block. To what height do the bullet and block swing?
Monday, October 29, 2012 at 7:54pm

physics
brakes are applied in bringing in a 1200-kg car moving at 25 m/s to rest in 20.0 s. show that the amount of braking force is 1500n.
Monday, October 29, 2012 at 7:30pm

PHYSICS
A woman whose weight is 530 Newtons is standing on the outer edge (right) of a diving board of 3.9 meters length. She is over the water of the pool. The left edge of the board is bolted down to the concrete. A support spring (shown as a fulcrum) is centered 1.4 meters from the...
Monday, October 29, 2012 at 7:30pm

physics
brakes are applied in bringing in a 1200-kg car moving at 25 m/s to rest in 20.0 s. show that the amount of braking force is 1500n.
Monday, October 29, 2012 at 7:29pm

Physics, newtons laws
A 50kg block is being pulled up a 13 degree slope by a force directed 30 degrees above the slope.? The coeffcienct of kinetic friction between the block and the slope is 0.200. What is the minimum force required for the block to continue to slide up the plane with no ...
Monday, October 29, 2012 at 7:20pm

Physics
How much higher must your blood pressure get to compensate for a 5% narrowing in your blood vessels? Using Bernoulli's fluid laws can someone explain this to me "The pressure difference across your blood vessels is essentially equal to your blood pressure" Po = &...
Monday, October 29, 2012 at 7:11pm

physics
A freight train has a mass of 1.6 × 10 7 kg. If the locomotive can exert a constant pull of 8.0 × 10 5 N, how long would it take to increase the speed of the train from rest to 80.3 km/h? Disregard friction
Monday, October 29, 2012 at 7:06pm

Physics
1. If a bar magnet is broken into two pieces, how many magnetic poles are there? 2. A long straight wire carries a current in the direction shown in the following figure. At the point labeled A, is the direction of the magnetic field left, right, up. Down, into the page, or ...
Monday, October 29, 2012 at 7:03pm

Physics- Elena please help! I'm so confused!!
A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 21.0° with the horizontal. A 37.0 kg piece of luggage is placed on the ...
Monday, October 29, 2012 at 6:34pm

physics
A satellite has a mass of 5910 kg and is in a circular orbit 4.69 × 105 m above the surface of a planet. The period of the orbit is 2.1 hours. The radius of the planet is 4.44 × 106 m. What would be the true weight of the satellite if it were at rest on the planet...
Monday, October 29, 2012 at 6:33pm

Physics- Elena please help!
Assume you are agile enough to run across a horizontal surface at 11.60 m/s on an airless spherical asteroid of uniform density 1.0x103 kg/m3, independently of the value of the gravitational field. To launch yourself into orbit by running, what would be (a) the radius? (b) the...
Monday, October 29, 2012 at 6:32pm

physics
One billiard ball is shot east at 2.1 . A second, identical billiard ball is shot west at 0.80 . The balls have a glancing collision, not a head-on collision, deflecting the second ball by 90 and sending it north at 1.47 .
Monday, October 29, 2012 at 6:20pm

Physics- Elena please help!
A coin rests 18.0 cm from the center of a turntable. The coefficient of static friction between the coin and turntable surface is 0.420. The turntable starts from rest at t = 0 and rotates with a constant angular acceleration of 0.650 rad/s2. (a) After 3.00 s, what is the ...
Monday, October 29, 2012 at 6:13pm

Physics- Elena please help!
A digital audio compact disc carries data along a continuous spiral track from the inner circumference of the disc to the outside edge. Each bit occupies 0.60 mm of the track. A CD player turns the disc to carry the track counter-clockwise above a lens at a constant speed of ...
Monday, October 29, 2012 at 6:13pm

Physics- Elena please help!
A digital audio compact disc carries data along a continuous spiral track from the inner circumference of the disc to the outside edge. Each bit occupies 0.60 mm of the track. A CD player turns the disc to carry the track counter-clockwise above a lens at a constant speed of ...
Monday, October 29, 2012 at 5:45pm

Physics, newtons laws
A bullet is fired with a certain velocity at an angle above the horizontal at a location where g= 10.0 m/s^2. The initial x any components of its velocity are 86.6 m/s and 50 m/s respectively. How long does it take before the bullet hits the ground?
Monday, October 29, 2012 at 5:42pm

Physics, newtons laws
A 20.0 gram mass is attached to a 120 com long string. It moves in a horizontal circle with a constant speed of 1.50 m/s. What is the degree is angle between the pole and the string?
Monday, October 29, 2012 at 5:38pm

Physics, newtons laws
A 50kg block is being pulled up a 13 degree slope by a force directed 30 degrees above the slope. The coeffcienct of kinetic friction between the block and the slope is 0.200. What is the minimum force required for the block to continue to slide up the plane with no ...
Monday, October 29, 2012 at 5:33pm

Physics- Elena please help!
A coin rests 18.0 cm from the center of a turntable. The coefficient of static friction between the coin and turntable surface is 0.420. The turntable starts from rest at t = 0 and rotates with a constant angular acceleration of 0.650 rad/s2. (a) After 3.00 s, what is the ...
Monday, October 29, 2012 at 5:31pm

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
Monday, October 29, 2012 at 5:24pm

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
Monday, October 29, 2012 at 5:22pm

Physics- Elena please help!!!!
A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/ min. When switched off, it rotates through 41.0 revolutions before coming to rest. (a) Find the angular speed in rad/s. (b) Find the displacement in radians. (c) Find the constant angular ...
Monday, October 29, 2012 at 5:14pm

physics
What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
Monday, October 29, 2012 at 4:51pm

Physics- Elena please help!
A massless spring of constant k =84.8 N/m is fixed on the left side of a level track. A block of mass m = 0.5 kg is pressed against the spring and compresses it a distance d, as in the figure below. The block (initially at rest) is then released and travels toward a circular ...
Monday, October 29, 2012 at 4:23pm

physics
A 4.20-kg watermelon is dropped from rest from the roof of a 28.0-m -tall building and feels no appreciable air resistance. Calculate the work done by gravity on the watermelon during its displacement from the roof to the ground. Just before it strikes the ground, what is the ...
Monday, October 29, 2012 at 3:42pm

Physics
Two blocks of masses m1 = 2.00 kg and m2 = 3.70 kg are each released from rest at a height of h = 5.60 m on a frictionless track, as shown in the figure below, and undergo an elastic head-on collision. (Let the positive direction point to the right. Indicate the direction with...
Monday, October 29, 2012 at 3:35pm

Physics
Two blocks of masses m1 = 2.00 kg and m2 = 3.70 kg are each released from rest at a height of h = 5.60 m on a frictionless track, as shown in the figure below, and undergo an elastic head-on collision. (Let the positive direction point to the right. Indicate the direction with...
Monday, October 29, 2012 at 3:32pm

Physics
A square loop 10cm on a side carries a current I' = 1A, and is placed 10cm away from a long,straight wire of current I = 10A, which is in the plane of the loop. Calculate the net force on the loop (in Newtons). Is the loop attracted to or repelled from the straight wire?
Monday, October 29, 2012 at 3:31pm

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