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November 26, 2014

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Recent Homework Questions About Physics

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physics
A 0.500 kg block is being slid, vertically up the chalkboard with an applied force of 6.00 N [upwards] and 2.00 N [inwards] (into the boards). If the coefficient of sliding friction is 0.400, calculate the accel of the block.
Monday, December 17, 2012 at 4:17pm

physics
A plane cruising at 251 m/s accelerates at25 m/s2 for 9 s.What is its final velocity?Answer in units of m/s
Monday, December 17, 2012 at 3:26pm

Physics
You throw a 6.2 bowling ball down a bowling alley. The ball is in your hand for a distance of 1.5 meters. Its speed increases from 0 to 16m/s(36mph). How much force did you apply?
Monday, December 17, 2012 at 2:27pm

Physics
An engine moves a motorboat through water at a constant velocity of 22 meters/second. If the force exerted by the motor on the boat is 5.75 × 103 newtons, what is the power of the motor?
Monday, December 17, 2012 at 2:26pm

physics
Brass is an alloy made from copper & zinc. A 0.55 kg brass sample at 96.7 C is dropped into 2.19kg of water at 4.4C. If the equilibrium temp is 7.0C, what isthe specific heat of wter is 4186 j/kg C. Answer in units of J/kg C
Monday, December 17, 2012 at 2:22pm

Physics
A plane is heading south with a velocity of 150 kilometers/hour. It experiences a tailwind with a velocity of 20 kilometers/hour. Find the resultant velocity of the plane
Monday, December 17, 2012 at 12:53pm

Physics
A hot, just minted copper coin is placed in 112g of water to cool. The water temperature changes by 8.58 C and the temperature of the coin changes by 80.0 C. What is the mass of the coin? Disregard any energy trans to the waters surroundings and assume the specific heat of ...
Monday, December 17, 2012 at 12:21pm

physics
A 608g sample of water at 77C is mixed w/429g of water at 23C. What is the final temp of the mixture? Assume no heat liss to the surroundings. Answer in units of C
Monday, December 17, 2012 at 12:17pm

physics
A hockey player makes a slap shot, exerting a constant force of 31.4 N on the hockey puck for 0.13 s. What is the magnitude of the impulse given to the puck?
Monday, December 17, 2012 at 12:14pm

physics
An Otto engine has a maximum efficiency of 33.1 %; find the compression ratio. Assume that the gas is diatomic.
Monday, December 17, 2012 at 12:01pm

physics
A heat pump has a coefficient of performance of 4.5. If the heat pump absorbs 46.1 cal of heat from the cold outdoors in each cycle, what is the amount of heat expelled to the warm indoors? (in cal) tried everything but got nothing.
Monday, December 17, 2012 at 12:00pm

physics
A 2.6kggold bar at 90C is dropped into a 0.21kg of water at 23C. What is the finl temperature? Assume the specific heat of gold is 129 J/kg C. Answer in units of C
Monday, December 17, 2012 at 11:47am

physics
An automobile of mass 1.46 E3 kg rounds a curve of radius 25.0 m with a velocity of 15.0 m/s. The centripetal force exerted on the automobile while rounding the curve is?
Monday, December 17, 2012 at 11:24am

physics
a 32g sample of copper is at 29C If 1502j of energy are added to the copper, what is the final temperature? Assume the specific heat of copper is 387J/KG C
Monday, December 17, 2012 at 10:58am

physics
Light is shone on a metal and photoelectrons are emitted. Can you tell me the three things from the listbelow which might cause the photoelectron emission to stop. Decreasing the intensity of the light Increasing the frequency of the light Decreasing the wavelength of the ...
Monday, December 17, 2012 at 10:02am

physics
In a circus performance, a monkey on a sled is given an initial speed of 3.9 m/s up a 17 ◦ incline. The combined mass of the monkey and the sled is 18.1 kg, and the coefficient of kinetic friction between the sled and the incline is 0.34. The acceleration of gravity...
Monday, December 17, 2012 at 4:17am

Physics
Could someone help me with this, please. Thanks. The tension in a rope attached to a boat is 27.5 lb. The rope is attached to the boat 6.0 ft below the level at which the boat is being drawn in. At the point where there is 18.0 ft of rope out, what force is bringing the boat ...
Monday, December 17, 2012 at 1:49am

physics
a bolwing ball of mass 2.00 kg strikes a stationary pin of mass 5.00 x 10^2 g. the collision lasts for .60s after which the pin moves off with a velocity of 12.0 m/s [w] a)accel of pin during the collision b)force exerted by bowling ball on the pin c)the accel of the bowling ...
Sunday, December 16, 2012 at 11:29pm

physics
Determine the net force needed to cause a 1310kg sports car to accelerate from 0 - 28.6m/s[fwd] in 5.6 s
Sunday, December 16, 2012 at 11:17pm

physics
5 kg of some liquid at 10 Celsius is mixed with 1 kg of the same liquid at 40 Celsius. What is the final equilibrium temperature? Ignore any heat flow with the containers and/or surroundings.
Sunday, December 16, 2012 at 11:11pm

physics
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.72 kg m-3. Under these conditions the total surface area of the balloon is 0.17 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Sunday, December 16, 2012 at 11:08pm

physics
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.72 kg m-3. Under these conditions the total surface area of the balloon is 0.17 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Sunday, December 16, 2012 at 11:08pm

physics
One strategy in a snowball fight is to throw a snowball at a high angle over level ground. While your opponent is watching this first snowball, you throw a second snowball at a low angle and time it to arrive at the same time as the first. Assume both ...
Sunday, December 16, 2012 at 10:30pm

Physics
A football is thrown toward a receiver with an initial speed of 17.5 m/s at an angle of 35.2◦ above the horizontal. At that instant, the receiver is 16.7 m from the quarterback. The acceleration of gravity is 9.81 m/s^2 With what constant speed should the receiver run to...
Sunday, December 16, 2012 at 9:49pm

physics
A particle travels horizontally between two parallel walls separated by 18.4 m. It moves toward the opposing wall at a constant rate of 9.4 m/s. Also, it has an acceleration in the direction parallel to the walls of 5.8 m/s^2 What will be its speed when it hits the opposing ...
Sunday, December 16, 2012 at 9:35pm

Physics
A spaceship at rest in a certain reference frame S is given a speed increment of 0.50c. Relative to its new rest frame, it is then given a further 0.50c increment. This process is continued until its speed with respect to its original frame S exceeds 0.999c. How many ...
Sunday, December 16, 2012 at 9:05pm

Physics
A index of certain type of glass has an an index of refraction of 1.66 for red light and 1.65 for violet light. If a beam of white in air approaches the glass with an angle of incidence of 49.0 degree, by what angle will the red light be separated from the violet light inside ...
Sunday, December 16, 2012 at 8:32pm

Physics
A candle flame is placed in front of a concave mirror on the principal axis such that is twice the size of the object and is inverted. If the sum of the object distance and the image distance is 72 cm, how far from the mirror is the image and what is the focal length of the ...
Sunday, December 16, 2012 at 8:25pm

physics
the muzzle velocity of a 50.0g shell leaving a 3.00kg rifle is 400 m/s what is the recoil velocity of the rifle
Sunday, December 16, 2012 at 8:06pm

physics
A 1.13 × 103 kg car accelerates uniformly from rest to 10.6 m/s in 3.22 s. What is the work done on the car in this time interval? Answer in units of J
Sunday, December 16, 2012 at 7:20pm

Physics
The tension in a rope attached to a boat is 27.5 lb. The rope is attached to the boat 6.0 ft below the level at which the boat is being drawn in. At the point where there is 18.0 ft of rope out, what force is bringing the boat towards the dock, and what force tends to raise ...
Sunday, December 16, 2012 at 6:56pm

physics
A uniform beam of length 7.60 m and weight 4.30 102 N is carried by two workers, Sam and Joe, as shown in the figure below. (a) Determine the forces that each person exerts on the beam. F_Sam = ___ N F_Joe = ___ N
Sunday, December 16, 2012 at 2:52pm

Physics
The weight of an object on Earth is 350 newtons. On Mars, the same object would weigh 134 newtons. What is the acceleration due to gravity on the surface of Mars, given that it is 9.8 meters/second2 on Earth?
Sunday, December 16, 2012 at 2:17pm

physics
The puck in the figure below has a mass of 0.160 kg. Its original distance from the center of rotation is 40.0 cm, and it moves with a speed of 60.0 cm/s. The string is pulled downward 15.0 cm through the hole in the frictionless table. Determine the work done on the puck. (...
Sunday, December 16, 2012 at 1:55pm

physics
the initial velocity of a 4 kg box is 11 m/s, due west. after the box slides 4 m horizontally its speed is 1.5 m/s. determine the magnitude and the direction of the non conservative force acting on the box as it slides.
Sunday, December 16, 2012 at 12:09pm

Physics
you weigh 120 lb at the sidewalk outside the world trade center. Suppose you ride from this level to the top of one of its 1350 ft tower. how much less would you weigh
Sunday, December 16, 2012 at 11:11am

Physics
An electronic motor is revolving at 2000rpm. After 3sec, it is moving at 150rpm. Determine the angular acceleration. What is angular momentum of the electric motor if the rotational inertia is 18.kg.square meter in initial velocity? In final velocity? What is the average ...
Sunday, December 16, 2012 at 11:05am

physics
Maxwell's equations proved that a. Light is a mechanical phenomena b. Light is a chemical phenomena c. Light is a phenomenal phenomena d. Light is an electromagnetic phenomena I think the answer is either a or d. But I'm pretty sure its d Thank you for any help and ...
Sunday, December 16, 2012 at 10:49am

physics
A block of weight 11 N is placed on a frictionless incline which makes an angle of 240 with the horizontal. Find the acceleration of the block as it slides down the incline.
Sunday, December 16, 2012 at 8:52am

physics
The gravitational field strength at the surface of a certain neutron star is 1.34*10^12 N/kg. What would be the theoretical maximum height of a cylindrical granite column which could support its own weight without crushing when exposed to a field of this magnitude? (density of...
Sunday, December 16, 2012 at 8:19am

physics
The gravitational field strength at the surface of a certain neutron star is 1.34*10^12 N/kg. What would be the theoretical maximum height of a cylindrical granite column which could support its own weight without crushing when exposed to a field of this magnitude? (density of...
Sunday, December 16, 2012 at 8:18am

Physics
A rubber ball is attached to a paddle by a rubber band. The ball is initially moving away from the paddle with a speed of 4.0 m/s. After 0.25 s, the ball is moving toward the paddle with a speed of 3.0 m/s. What is the average acceleration of the ball during that 0.25 s? Give ...
Sunday, December 16, 2012 at 4:22am

Calc and Physics
Damon and Reiny. Thanks for your quick and thorough responses.
Sunday, December 16, 2012 at 2:03am

physics
Each of the following objects has a radius of 0.180 m and a mass of 2.65 kg, and each rotates about an axis through its center (as in the table below) with an angular speed of 41.4 rad/s. Find the magnitude of the angular momentum of each object. a) a hoop ___ kg m/s b) a ...
Saturday, December 15, 2012 at 11:58pm

physics
Each of the following objects has a radius of 0.180 m and a mass of 2.65 kg, and each rotates about an axis through its center (as in the table below) with an angular speed of 41.4 rad/s. Find the magnitude of the angular momentum of each object. a) a hoop ___ kg m/s b) a ...
Saturday, December 15, 2012 at 11:56pm

Physics
A 5.00-grain aspirin tablet has a mass of 320 mg. For how many kilometers would the energy equivalent of this mass power an automobile? Assume 12.75 km/L and a heat of combustion of 3.65x10^7 J/L for the gasoline used in the automobile.
Saturday, December 15, 2012 at 10:42pm

Physics
mass of an unknown sample is 0.240 kg in air and 0.208 kg when in oil of density=800 kg/m^3. Determine volume and density. Is the density 0.240/800?
Saturday, December 15, 2012 at 10:29pm

physics
an empty rubber balloon has mass 0.0120kg, the balloon is filled with helium of density 0.181 kg/m^3. the balloon is spherical w/ radius 0.500m. if the balloon is ties to a vertical string, what is thw tension in the string? density of air 1.29 kg/m^3
Saturday, December 15, 2012 at 9:28pm

Physics
A spaceship at rest in a certain reference frame S is given a speed increment of 0.50c. Relative to its new rest frame, it is then given a further 0.50c increment. This process is continued until its speed with respect to its original frame S exceeds 0.999c. How many ...
Saturday, December 15, 2012 at 8:27pm

college physics
have a couple of questions about my homework and it's due at midnight tonight: 1. On a hot summer day, the temperature of air in Arizona reaches 115°F. What is the speed of sound in air at this temperature? (Enter your answer to four significant figures. The speed of ...
Saturday, December 15, 2012 at 8:11pm

Physics
A rogue chipmunk has been raiding the secrete acorn stash of 3 squirrels. On discovering the perpetrator in the very act they secure him with 3 ropes and attempt to pull him off the limb where he falls to his demise. The first squirrel pulls at an angle of 12 degrees with a ...
Saturday, December 15, 2012 at 7:58pm

Physics
a 4 kg block is being pulled by a string at a constant speed on a surface with coeficient of kinetic friction of .3. If the string is at an angle 45 degrees above the horizontal, what is the magnitude of the force F(also known as the string)?
Saturday, December 15, 2012 at 7:28pm

Physics
a 4 kg block is being pulled by a string at a constant speed on a surface with coeficient of kinetic friction of .3. If the string is at an angle 45 degrees above the horizontal, what is the magnitude of the force F(also known as the string)?
Saturday, December 15, 2012 at 7:24pm

Physics
a 4 kg block is being pulled by a string at a constant speed on a surface with coeficient of kinetic friction of .3. If the string is at an angle 45 degrees above the horizontal, what is the magnitude of the force F(also known as the string)?
Saturday, December 15, 2012 at 7:21pm

physics
a truck with a mass of 2100 kg travels at a constant speed of 75 km/h. (a) What is the magnitude of the truck’s linear momentum? kg·m/s (b) What average force would be required to stop the truck in 7.5 s? does this have to do with f=ma or not? help
Saturday, December 15, 2012 at 6:33pm

Physics
If we intercept an electron having total energy 1533 MeV that came from Vega, which is 26 ly from us, how far in light-years was the trip in the rest frame of the electron? (Answer: 8.7*10^-3 ly)
Saturday, December 15, 2012 at 6:12pm

physics
a girl throws a dart with a speed of 12.4 meters per second. the dart hits the board .32 meters below the height from which it was thrown. how far from the board was the girl?
Saturday, December 15, 2012 at 6:02pm

Physics
A 59-kg person on skis starts from rest down a hill sloped at 36° from the horizontal. The coefficient of friction between the skis and the snow is 0.16. After the skier had been moving for 5.0 s, the friction of the snow suddenly increased and made the net force on the ...
Saturday, December 15, 2012 at 4:59pm

Physics
Five forces act on an object. (1) 63 N at 90° (2) 40 N at 0° (3) 83 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?
Saturday, December 15, 2012 at 4:58pm

Physics
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.35 kg m-3. Under these conditions the total surface area of the balloon is 0.88 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 3:11pm

physics
is2A wedge of mass M fitted with a spring of stiftness k is kept on a smoth hrizontal surface. A rod of mass m is kept on the wedge as shown in the figure. System is in equilibrium. Assuming that all the surfaces are smooth, the potential energy stored in the spring: a) ...
Saturday, December 15, 2012 at 2:14pm

physics
Why might it be hard for the firefighter to hold the hose steady when the water gushes out of the hose? Think about the law of conservation of momentum.
Saturday, December 15, 2012 at 1:44pm

physics
You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 206.5 ppm and is initially uniform through the thickness of the steel. The atmosphere of...
Saturday, December 15, 2012 at 12:55pm

physics
hi every one i appreciate help as ineed answer as soon a jetplane discharges a jet at rate of 28kg/s with a velocity of 950 m/s relative to the plane if the forward speed of the plane is 875km/h what is the thrust developped on the plane and the power developed at the jet the ...
Saturday, December 15, 2012 at 11:53am

physics
an air craft of mass 5110 kg flying in level flight at speed of 398 knots air enters the engine is 65 kg/s and the jet speed relative to the air craft is 610 m/s if the lift drag ratio is 10 find accerlation and power and thrust thanks if any one can help i done it but i get a...
Saturday, December 15, 2012 at 11:19am

Physics
Hello I am trying to solve this physics problem related to effusion of gases. The following data is given and I am asked to calculate the rate of effusion The data given; depth/thickness (t) Surface area (A) diffusion coefficient (D) Can someone help me out? The only law ...
Saturday, December 15, 2012 at 7:42am

Physics
Amy age 8 27kg 127cm Bruce age 12 41kg 149cm Both Amy and Bruce are learning gymnastics and having trouble being able to get enough height and time in the air to do a back somersault without the coach spotting them. The coach gives them homework to just focus on jumping ...
Saturday, December 15, 2012 at 12:35am

physics
A 224 g particle is released from rest at point A along the diameter on the inside of a fric- tionless, hemispherical bowl of radius 44 cm. The acceleration of gravity is 9.8 m/s2 .
Friday, December 14, 2012 at 11:39pm

physics
An Alaskan rescue plane traveling 37 m/s drops a package of emergency rations from a height of 149 m to a stranded party of explorers. The acceleration of gravity is 9.8 m/s 2 . Where does the package strike the ground relative to the point directly below where it was released...
Friday, December 14, 2012 at 11:25pm

physics
Someone in a car going past you at the speed of 43 m/s drops a small rock from a height of 1.6 m. How far from the point of the drop will the rock hit the ground? The acceleration due to gravity is 9.8 m/s 2 . Answer in units of m
Friday, December 14, 2012 at 11:24pm

physics
During a baseball game, a batter hits a popup to a fielder 64 m away. The acceleration of gravity is 9.8 m/s 2 . If the ball remains in the air for 6.7 s, how high does it rise? Answer in units of m
Friday, December 14, 2012 at 11:23pm

Physics
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 3.82 x 105 N. In being launched from rest it moves through a distance of 57.2 m and has a kinetic energy of 5.71 x 107 J at lift-off. ...
Friday, December 14, 2012 at 9:43pm

Physics
A bead slides without friction around a loop- the-loop. The bead is released from a height of 12.9 m from the bottom of the loop-the- loop which has a radius 4 m. The acceleration of gravity is 9.8 m/s2 . A 4m 12.9 m What is its speed at point A ? Answer in units of m/s
Friday, December 14, 2012 at 9:02pm

Physics
Find the work done in stretching the spring. Answer in units of J
Friday, December 14, 2012 at 9:00pm

Physics
The force required to stretch a Hooke’s-law spring varies from 0 N to 70.4 N as we stretch the spring by moving one end 5.35 cm from its unstressed position. Find the force constant of the spring. Answer in units of N/m
Friday, December 14, 2012 at 9:00pm

physics
A 22 g bullet is accelerated in a rifle barrel 43.2 cm long to a speed of 907 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N
Friday, December 14, 2012 at 8:58pm

physics
Radio waves of frequency 30 kHz are received at a location 1500 km from a transmitter. The radio reception temporarily “fades” due to destructive interference between the waves travelling parallel to the ground and the waves reflected from a layer (ionosphere) of the...
Friday, December 14, 2012 at 7:07pm

Physics
The drawing shows a skateboarder moving at 6.41 m/s along a horizontal section of a track that is slanted upward by 47.4 ° above the horizontal at its end, which is 0.612 m above the ground. When she leaves the track, she follows the characteristic path of projectile ...
Friday, December 14, 2012 at 6:48pm

Physics
You are trying to lose weight by working out on a rowing machine. Each time you pull the rowing bar (which simulates the "oars") toward you, it moves a distance of 1.32 m in a time of 1.22 s. The readout on the display indicates that the average power you are ...
Friday, December 14, 2012 at 6:01pm

Physics
a 32 kg child stands at the edge of a circular platform that rotates at w=2rad/s about its center. Mass of platform=60kg, radius=2m. The child walks from the rim towards the center. Find the Angular speed when the child reaches a point 0.500 m from the center.
Friday, December 14, 2012 at 4:35pm

physics
The yellow line emitted by a helium discharge tube in the laboratory has a wavelength of 587 nm The same yellow line in the helium spectrum of a star has a measured wavelength of 590 nm. Calculate the speed of the moving star.
Friday, December 14, 2012 at 12:36pm

physics
An audio speaker at a concert emits sound uniformly in all directions at a rate of 100 W. (i) Calculate the sound intensity experienced by a listener at a distance of 8 m from the speaker. The listener moves back from the speaker to protect her hearing. (ii) At what distance ...
Friday, December 14, 2012 at 11:45am

physics
In the figure below, the scale on which the 63 kg physicist stands reads 236 N. How long will the cantaloupe take to reach the floor if the physicist drops it (from rest relative to himself) at a height of 2.1 m above the floor? How would you go about solving this?
Friday, December 14, 2012 at 11:42am

physics
The length of a pipe, closed at one end is is 90 cm. Calculate the frequency of the standing wave. What is the fundamental frequency of the pipe?
Friday, December 14, 2012 at 11:25am

physics
A horizontal slingshot consists of two light, identical springs (with spring constants of 37.7 N/m) and a light cup that holds a 1.37-kg stone. Each spring has an equilibrium length of 50 cm. When the springs are in equilibrium, they line up vertically. Suppose that the cup ...
Friday, December 14, 2012 at 10:27am

physics
A stretched string of length 80 cm has a fundamental frequency of vibration of 400 Hz. What is the speed of the sound wave in the stretched string?
Friday, December 14, 2012 at 9:05am

physics
The sound intensity level at a concert increases from 85 dB to 94 dB when the concert begins. By what factor has the sound intensity increased?
Friday, December 14, 2012 at 8:53am

Physics
Show or prove that tan(θ) = v2/rg
Friday, December 14, 2012 at 8:31am

Physics
the net external force of the propeller of a 4.0 kg model airplane is 9.5 N forward. What is the acceleration of the airplane? Answer in units of m/s^2
Thursday, December 13, 2012 at 10:36pm

physics
A machine part rotates at an angular speed of 0.77 rad/s; its speed is then increased to 1.76 rad/s using an angular acceleration of 0.29 rad/s 2 . Find the angle through which the part rotates before reaching this final speed. Answer in units of rad
Thursday, December 13, 2012 at 10:23pm

Physics
Two long, straight, parallel wires carry current in the same direction. If the wires are 24 cm apart and carry currents of 2.0 A and 4.0 A, respectively, find the force per unit length on each wire?
Thursday, December 13, 2012 at 10:02pm

physics
A 443 kg mass is brought close to a second mass of 181 kg on a frictional surface with coefficient of friction 0.5. At what distance will the second mass begin to slide toward the first mass? The acceleration of gravity is 9.8 m/s 2 and the value of the universal ...
Thursday, December 13, 2012 at 9:51pm

Fund of programming 1
Write a program that prints out your course schedule for a single week. Here's an example of the output for one day: Monday 9:00 Computer Science 101 Monday 11:00 Physics 201 Monday 2:00 Dance 153
Thursday, December 13, 2012 at 9:42pm

physics
An archer puts a 0.34 kg arrow to the bowstring. An average force of 213.1 N is exerted to draw the string back 1.48 m. The acceleration of gravity is 9.8 m/s 2 . Assuming no frictional loss, with what speed does the arrow leave the bow? Answer in units of m/s
Thursday, December 13, 2012 at 9:38pm

physics
How high does a rocket have to go above the Earth’s surface so that its weight is reduced to 33.7 % of its weight at the Earth’s surface? The radius of the Earth is 6380 km and the universal gravitational constant is 6.67 × 10 −11 N · m 2 /kg 2 . ...
Thursday, December 13, 2012 at 9:33pm

physics
Tom has a mass of 72.2 kg and Sally has a mass of 49.4 kg. Tom and Sally are standing 17.4 m apart on a massless dance floor. Sally looks up and she sees Tom. She feels an attraction. If the attraction is gravitation, find its magnitude. Assume both can be replaced...
Thursday, December 13, 2012 at 9:30pm

physics
A 443 kg mass is brought close to a second mass of 181 kg on a frictional surface with coefficient of friction 0.5. At what distance will the second mass begin to slide toward the first mass? The acceleration of gravity is 9.8 m/s 2 and the value of the universal ...
Thursday, December 13, 2012 at 9:29pm

current physics
3 kilo ohms ll 5 kilo ohms = 1.875 kilo ohms
Thursday, December 13, 2012 at 9:13pm

Physics
Two long, straight, parallel wires carry current in the same direction. If the wires are 24 cm apart and carry currents of 2.0 A and 4.0 A, respectively, find the force per unit length on each wire? I'm not really sure how to go about this. I must be spacing or something.
Thursday, December 13, 2012 at 8:53pm

physics
A person walks the path shown below. The total trip consists of four straight-line paths. Path 1 is 80.0 m due east. Path 2 is 250.0 m due south. Path 3 is 130.0 m 30.0° south of west. Path 4 is 190.0 m 60.0° north of west. At the end of the walk, what is the person&#...
Thursday, December 13, 2012 at 8:11pm

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