Monday
November 24, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
A(n) 1949.1 kg car is coasting along a level road at 22.9 m/s. A constant braking force is applied, such that the car is stopped in a distance of 74.6 m. What is the magnitude of the braking force? Answer in units of N
Sunday, November 23, 2014 at 11:53pm

physics
A(n) 1949.1 kg car is coasting along a level road at 22.9 m/s. A constant braking force is applied, such that the car is stopped in a distance of 74.6 m. What is the magnitude of the braking force? Answer in units of N
Sunday, November 23, 2014 at 11:52pm

physics
A 4.40kg block hangs from a spring with spring constant 2160N/m . The block is pulled down 4.60cm from the equilibrium position and given an initial velocity of 1.40m/s back toward equilibrium. What is the frequency of motion? What is the amplitude? What is the total ...
Sunday, November 23, 2014 at 11:08pm

physics
A 0.500kg ball is tied to the end of a 1.50m string and revolved so its andle thata is 35 degrees. a.) find the velocity of the ball (ans 2.43)
Sunday, November 23, 2014 at 10:13pm

physics
A 1.2kg lead ball is launched off a cliff top at 16m/s at an angle of 20 degrees above the horizontal. The height of the horizontal is 15m. Determine the net force acting on the lead ball that caused the ball to drop 4.0m from point P.
Sunday, November 23, 2014 at 9:54pm

Physics
An 8.00g bullet is fired at 220m/s into a 250g wooden block that is initially at rest. The bullet remains in the block and after the collision the two slide up a 30 degree incline. a) Solve for the velocity of the bullet block after the collision. b) Determine the distance ...
Sunday, November 23, 2014 at 9:36pm

Physics
A lathe, initially at rest, accelerates at .60 rad/s^2 for 10s, then runs at a constant angular velocity for 20s, and finally decelerates uniformly for 10s to come to a complete stop. What is its average angular velocity?
Sunday, November 23, 2014 at 9:24pm

Physics
The angular velocity of a wheel is given by w(t) = (2.00 rad/s^2)t + (1.00 rad/s^4)t^3. A. What is the angular displacement of the wheel from time t=0.00s to time t=T? B.What is the angular acceleration of the wheel as a function of time?
Sunday, November 23, 2014 at 9:22pm

College Physics
A thin rod (uniform density & thickness) has mass M and length L. It is attached to the floor at a fixed location by a friction-less hinge. The rod start at rest, balanced vertically on its hinge end. ______________________________________ 1) While balanced vertically, the ...
Sunday, November 23, 2014 at 9:18pm

physics please help
On the surface of a planet an object is thrown vertically upward with an initial speed of 60 m/s. use a conservation of energy approach to determine the object's speed when the object is at a quarter of it's maximum height. (assume the planet has no atmosphere) PLEASE ...
Sunday, November 23, 2014 at 8:53pm

physics please help
a 65 kg bag is dragged along a 12m ramp in order to get from the ground to the floor of the loading dock 2m above the ground. determine the efficiency of of the ramp. The frictional force acting on the bag is 50N due to the ramp. I don't understand how to the find the ...
Sunday, November 23, 2014 at 8:43pm

Physics
A thin rod (uniform density & thickness) has mass M and length L. It is attached to the floor at a fixed location by a friction-less hinge. The rod start at rest, balanced vertically on its hinge end. ______________________________________ 1) While balanced vertically, the ...
Sunday, November 23, 2014 at 8:21pm

physics
When a wave crosses a boundary between a thin and a thick rope, its frequency changes, but its wavelength and speed do not. True or false I think the answer is True
Sunday, November 23, 2014 at 7:48pm

physics
An object of mass 1.5 kg rests on a shelf where it has a gravitational potential energy of 7 joules. An object of mass 4.5 kg is placed on the same shelf. What is the gravitational potential energy of this second object?
Sunday, November 23, 2014 at 7:38pm

PLEASE HELP PHYSICS
True or False 1. The frequency of the wave can be changed by changing the frequency at which the waves are generated 2. Two crests are out of phase with each other. A crest and a trough are in phase with eachother 3. When a wave reaches the boundary of a new medium, part of ...
Sunday, November 23, 2014 at 7:37pm

Physics
A roll of toilet paper (a partially hollow cylinder with R_2 = 7.5cm, M = 300g, and I = 9.0 x 10^-4 kg m^2) is mounted on a mass-less axle along its central axis. Te roll is initially at rest. Then, at t=0, a child grabs the end of the roll and starts running, pulling the ...
Sunday, November 23, 2014 at 7:29pm

physics
a 65 kg bag is dragged along a 12m ramp in order to get from the ground to the floor of the loading dock 2m above the ground. determine the efficiency of of the ramp. The frictional force acting on the bag is 50N due to the ramp. I don't understand how to the find the ...
Sunday, November 23, 2014 at 7:19pm

Physics
True or false Wavelength is the distance between two adjacent points on a wave that are in phase My work I think it is false
Sunday, November 23, 2014 at 6:54pm

Probability
You have a blind date with a physics major. From your social networking experience, you know that 10% of physics majors are immature, 50% are narcissistic, and 90% are boring. Assume that immaturity, narcissism, and boringness are independent events. Calculate the probability ...
Sunday, November 23, 2014 at 6:47pm

Physics
A 0.118 kg baseball traveling with a horizontal speed of 3.14 m/s is hit by a bat and then moves with a speed of 33.7 m/s in the opposite direction. What is the magnitude of the change in the ball's momentum?
Sunday, November 23, 2014 at 6:40pm

physics
a 65 kg bag is dragged along a 12m ramp in order to get from the ground to the floor of the loading dock 2m above the ground. determine the efficiency of of the ramp. I don't understand how to the find the energy output and input.
Sunday, November 23, 2014 at 6:30pm

Physics
a projectile is fired at such an angel from the horizontal that the vertical componet of its velocity is 49m/s. the horizontal componet of its velocity is 61 m/s. what is the initial velocity of the projectile?
Sunday, November 23, 2014 at 5:35pm

physics
A sled on ice moves in the ways described in the questions below. Friction is so small that it can be ignored. A person wearing spiked shoes standing on the ice can apply a force to the sled and push it along the ice.Which force would keep the sled moving toward the right and ...
Sunday, November 23, 2014 at 5:24pm

Physics
True or false 1. When a wave reaches the boundary of a new medium,part of the wave can be reflected and part of the wave can be transmitted into the new medium. 2. When a wave crosses a boundary between a thin and a thick rope its frequency changes, but its wavelength and ...
Sunday, November 23, 2014 at 5:10pm

Physics
The frequency of the wave can be changed by changing the frequency at which the waves are generated. True or false My work I think the answer is false
Sunday, November 23, 2014 at 4:41pm

physics
Air at 1 atm is inside a cylinder 17.9 cm in radius and 17.9 cm in length that sits on a table. The top of the cylinder is sealed with a movable piston. A 24.1-kg block is dropped onto the piston. a) From what height above the piston must the block be dropped to compress the ...
Sunday, November 23, 2014 at 4:27pm

Physics
A projectile of mass 0.99 kg is shot from a cannon. The end of the cannon’s barrel is at height 6.6 m, as shown in the figure. The initial velocity of the projectile is 9.2 m/s. The projectile rises to a maximum height of ∆y above the end of the cannon’s barrel...
Sunday, November 23, 2014 at 4:09pm

physics
A proton moves with a velocity V (2i - 4 j + k) m / s in a region where the field is given by B = (i + 2 j -3k) T . What is the magnitude of the magnetic force experienced by the load?
Sunday, November 23, 2014 at 3:53pm

physics
Moving fast proton of 4x106 m / s through a 1.7 T magnetic field experiences a force 8x10-13N magnetic. What is the angle between the velocity vector associated with the proton and the magnetic field?
Sunday, November 23, 2014 at 3:48pm

Physics
A 4.40kg block hangs from a spring with spring constant 2160N/m . The block is pulled down 4.60cm from the equilibrium position and given an initial velocity of 1.40m/s back toward equilibrium. What is the frequency of motion? What is the amplitude? What is the total ...
Sunday, November 23, 2014 at 3:45pm

Physics
A piece of aluminum has a volume of 1.55 x 10-3 m3. The coefficient of volume expansion for aluminum is = 69 x 10-6(C°)-1. The temperature of this object is raised from 25.9 to 406 oC. How much work is done by the expanding aluminum if the air pressure is 1.01 x 105 Pa?
Sunday, November 23, 2014 at 2:47pm

Physics
A pond is 12 metres across. The crests of two successive waves are 60.0 cm apart and they each move across the pond in 15 seconds. a)What is the velocity of the waves? b)What is the frequency of the waves? c)What is the period of the waves?
Sunday, November 23, 2014 at 2:12pm

Physics
An aircraft landing on an aircrafts carrier is brought to a complete stop from an initial of 215km/h in 2.7 seconds. What is its acceleration in m/s2?
Sunday, November 23, 2014 at 1:57pm

physics. I waited over two days for response
An 800kg police boat slows down uniformly from 50km/h (E) to 20km/h(E) as it enters a harbour. If the boat slows down over a 30m distance, what is the force of friction of the boat? (Hint: you will need to convert the velocities into m/s) please show your work.
Sunday, November 23, 2014 at 1:54pm

physics help please!!!!!!!!!
An 800kg police boat slows down uniformly from 50km/h (E) to 20km/h(E) as it enters a harbour. If the boat slows down over a 30m distance, what is the force of friction of the boat? (Hint: you will need to convert the velocities into m/s) please show your work.
Sunday, November 23, 2014 at 1:50pm

Physics
A boy wants to throw a ball into his friend’s window 16.0 m above. Assuming it just reaches the window, he throws the ball at 55.0° to the ground. At what velocity should he throw the ball?
Sunday, November 23, 2014 at 1:46pm

Physics help. please
An 800kg police boat slows down uniformly from 50km/h (E) to 20km/h(E) as it enters a harbour. If the boat slows down over a 30m distance, what is the force of friction of the boat? (Hint: you will need to convert the velocities into m/s) please show your work.
Sunday, November 23, 2014 at 1:21pm

Physics help. pls
An 800kg police boat slows down uniformly from 50km/h (E) to 20km/h(E) as it enters a harbour. If the boat slows down over a 30m distance, what is the force of friction of the boat? (Hint: you will need to convert the velocities into m/s) please show your work.
Sunday, November 23, 2014 at 1:21pm

physics
An 800kg police boat slows down uniformly from 50km/h (E) to 20km/h(E) as it enters a harbour. If the boat slows down over a 30m distance, what is the force of friction of the boat? (Hint: you will need to convert the velocities into m/s) please show your work.
Sunday, November 23, 2014 at 1:06pm

physics
it takes about 560 kilowatts to run a diesel locomotive at speed around 180km/h.Magnetically levitated trains(mag levs) on the other hand require less power because the magnetic levitation eliminates energy loss to friction.The worst maglev system requires 270 watts to ...
Sunday, November 23, 2014 at 12:19pm

Physics
In a running event, a sprinter does 4.1 ✕ 105 J of work and her internal energy decreases by 8.1 ✕ 105 J.
Sunday, November 23, 2014 at 12:07pm

Physics
A certain car has an acceleration of 2.4m/s2.Assume that its acceleration remains constant. Starting from rest,how long does the car require to reach a velocity of 90km/h? How far does it travel while reaching that velocity?
Sunday, November 23, 2014 at 11:39am

Physics
An aircraft landing on an aircrafts carrier is brought to a complete stop from an initial of 215km/h in 2.7 seconds. What is its acceleration in m/s2?
Sunday, November 23, 2014 at 11:31am

Physics
A car accelerates from rest to 90km/h in 10 seconds.What is its acceleration in m/s2?
Sunday, November 23, 2014 at 11:28am

physics
a concrete slab of mass 400 kg accelerates down a concrete slope inclined at 35 degrees. the coefficient of kinetic friction between the slab and slope is 0.60. determine the acceleration of the block
Sunday, November 23, 2014 at 10:48am

physics
A ball thrown vertically upwards from ground level hits the ground after 4 seconds.Calculate the maximum height it reached during its journey.
Sunday, November 23, 2014 at 10:34am

Physics
An 800kg police boat slows down uniformly from 50km/h (E) to 20km/h(E) as it enters a harbour. If the boat slows down over a 30m distance, what is the force of friction of the boat? (Hint: you will need to convert the velocities into m/s) please show your work.
Sunday, November 23, 2014 at 12:48am

Physics
What is the vector product of A=2i + 3j + 1k and B=1i - 3j - 2k?
Sunday, November 23, 2014 at 12:31am

Physics
A person pushes on a doorknob with a force of 5N. The direction of the force is at an angle of 20 degrees from the perpendicular to the surface of the door. The doorknob is located .800m from axis of the hinges of the door. The door begins to rotate with an angular ...
Sunday, November 23, 2014 at 12:29am

Physics
A two dimensional object placed in the xy plane has three forces acting on it: a force of 3N along the x axis acting at a point (3m, 4m); A force of 2N along the y axis acting at (-2, 5m); and a force of 5N in the negative x direction acting at (-2m, -3m). What is the net ...
Sunday, November 23, 2014 at 12:23am

Physics
A man is holding an 8.00kg vacuum cleaner at arm's length, a distance of .550m from his shoulder. What is the torque on the shoulder joint if the arm is held at 30degrees below the horizontal?
Sunday, November 23, 2014 at 12:16am

physics
In an effort to loosen the bolt on the wheel of a car, a man with a mass of 70kg steps on the end of a 50cm tire iron which is extending horizontally from the bolt. How much torque is he applying to the bolt?
Sunday, November 23, 2014 at 12:12am

Physics
A lathe, initially at rest, accelerates at .60 rad/s^2 for 10s, then runs at a constant angular velocity for 20s, and finally decelerates uniformly for 10s to come to a complete stop. What is its average angular velocity?
Sunday, November 23, 2014 at 12:08am

Physics
The angular velocity of a wheel is given by w(t) = (2.00 rad/s^2)t + (1.00 rad/s^4)t^3. A. What is the angular displacement of the wheel from time t=0.00s to time t=T? B.What is the angular acceleration of the wheel as a function of time?
Sunday, November 23, 2014 at 12:04am

physics
A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials’ boat pulls up next to the spy’s boat, both boats reach the edge of a 4.5m waterfall. The spy’s speed is 16 m/s and the officials’ speed is ...
Saturday, November 22, 2014 at 11:46pm

physics
Consider a very small hole in the bottom of a tank that is 17.0 cm in diameter and filled with water to a height of 90.0 cm. Find the speed at which the water exits the tank through the hole. A) 48.3 m/s B) 44.1 m/s C) 17.64 m/s D) 4.20 m/s
Saturday, November 22, 2014 at 10:00pm

physics
A skier of mass 70.4 kg, starting from rest, slides down a slope at an angle $\theta$ of 36.8° with the horizontal. The coefficient of kinetic friction is 0.14. What is the net work, i.e. net gain in kinetic energy, (in J) done on the skier in the first 8.4 s of descent?
Saturday, November 22, 2014 at 9:54pm

physics
A skier of mass 70.4 kg, starting from rest, slides down a slope at an angle $\theta$ of 36.8° with the horizontal. The coefficient of kinetic friction is 0.14. What is the net work, i.e. net gain in kinetic energy, (in J) done on the skier in the first 8.4 s of descent?
Saturday, November 22, 2014 at 9:54pm

physics
A skier of mass 70.4 kg, starting from rest, slides down a slope at an angle $\theta$ of 36.8° with the horizontal. The coefficient of kinetic friction is 0.14. What is the net work, i.e. net gain in kinetic energy, (in J) done on the skier in the first 8.4 s of descent?
Saturday, November 22, 2014 at 9:53pm

Physics
A roll of toilet paper (a partially hollow cylinder with R_2 = 7.5cm, M = 300g, and I = 9.0 x 10^-4 kg m^2) is mounted on a mass-less axle along its central axis. Te roll is initially at rest. Then, at t=0, a child grabs the end of the roll and starts running, pulling the ...
Saturday, November 22, 2014 at 9:35pm

physics
The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the total force on a(n) 75 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 66 m/s in 4.5 s? Answer in units of kN
Saturday, November 22, 2014 at 8:20pm

physics
When a container of water is placed on a laboratory scale, the scale reads 120 g. Now a 20-g piece of copper (of density 8.9 g/cm3) is suspended from a thread and lowered into the water, not touching the bottom of the container. What will the scale now read? The density of ...
Saturday, November 22, 2014 at 7:43pm

Physics
Aqua dude can swim at a speed of 2.0m/s in still water. A river is 48 m wide and has a current of 1.5 m/s [E]. He starts at the Southbank and swims so that he is always headed directly across the river. A) what is Aqua dudes velocity relative to the shore? B) how long does it ...
Saturday, November 22, 2014 at 7:34pm

physics
A Venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at speed v2 through a horizontal section of pipe whose cross-sectional area is A2 = 0.0769 m2. The gas has a density of ρ = 1.30 kg/m3. The Venturi meter has a ...
Saturday, November 22, 2014 at 4:21pm

physics
A square with side lengths of 1.05 m has a charge of 8.00 mC at each corner. Calculate the magnitude and direction of the force on each charge
Saturday, November 22, 2014 at 3:58pm

physics Pls help
A piece of glass has a temperature of 87.0 °C. Liquid that has a temperature of 32.0 °C is poured over the glass, completely covering it, and the temperature at equilibrium is 57.0 °C. The mass of the glass and the liquid is the same. Ignoring the container that ...
Saturday, November 22, 2014 at 3:49pm

Physics
A 4.0-kg cylinder of solid iron is supported by a string while submerged in water. What is the tension in the string? The density of iron is 7860 kg/m3 and that of water is 1000 kg/m3. A) 34 N B) 2.5 N C) 24 N D) 40 N E) 20 N
Saturday, November 22, 2014 at 3:46pm

Physics
A water tank is filled to a depth of 10 m, and the bottom of the tank is 20 m above ground. A water-filled hose that is 2.0 cm in diameter extends from the bottom of the tank to the ground, but no water is flowing in this hose. The water pressure at ground level in the hose is...
Saturday, November 22, 2014 at 1:19pm

Physics
A 4 kg bundle starts up a 30o incline with 128 J of kinetic energy. How far will it slide up the incline if the coefficient of friction between bundle and incline is 0.30? Pls help me solve this, I dont know what formula to use...
Saturday, November 22, 2014 at 6:54am

physics
an ice skater applies a horizontal force to a 20 kg block on frictionless, level ice causing the block to accelerate uniformly at 1.4 m/s^2 to the right. after the skater stops pushing the block it slides onto a region of ice that is covered with a thin layer of sand. the ...
Friday, November 21, 2014 at 10:31pm

Physics
1. A student lifts his 2.0-kg pet rock 2.8m straight up. He then lets it drop to the ground. Use the Law of Conservation of Energy to calculate how fast the rock will be moving ..... a. half way down b. just before it hits the ground 2. A 65-kg girl is running with a speed of ...
Friday, November 21, 2014 at 10:23pm

Physics
1. Determine the specific heat of a certain metal if a 450-g sample of it loses 34,500 joules of heat as its temperature drops by 97degC. 2. The temperature of a 55-g sample of a certain metal drops by 113degC as it losses 3,500 J of heat. What is the specific heat of the ...
Friday, November 21, 2014 at 10:22pm

physics
The position versus time for a certain object moving along the x-axis is shown. The object’s initial position is −2 m. Find the instantaneous velocity at 6 s. Answer in units of m/s
Friday, November 21, 2014 at 9:47pm

Physics
Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.1 kg · m2 and an angular velocity of +8.0 rad/s. Disk B is rotating with an angular velocity of -10.2 rad/s. The two disks are then linked together without the aid of any external torques, ...
Friday, November 21, 2014 at 8:51pm

Physics
Starting from rest, a basketball rolls from the top of a hill to the bottom, reaching a translational speed of 3.83 m/s. Ignore frictional losses. (a) What is the height of the hill? I've tried to use the mgh=1/2mv^2. I think it's because it's translational speed. ...
Friday, November 21, 2014 at 8:23pm

Physics
A wheel starts from rest and rotates about its axis with constant angular acceleration. After 8.7s have elapsed, it has rotated through an angle of 20 radians. What is the angular acceleration of the wheel? What is the angular velocity when the time t = 8.7 s? I got the answer...
Friday, November 21, 2014 at 6:11pm

Physics
A marble rolls down an incline of 30 degrees. If the marble is initally at rest at the top of the incline of length 2.0 meters what will the speed of the marble be at the bottom of the incline (a) if the incline is rough enough to prevent any slipping [ it rolls],then (b) if ...
Friday, November 21, 2014 at 6:08pm

Physics
An airplane flies at a constant speed in a straight line. A bale of hay is dropped from the bottom of the plane to some cattle in a snowstorm. When the bale hits the ground, where is the plane? (Ignore air resistance) Explain your answer!
Friday, November 21, 2014 at 6:01pm

physics
A launching mechanism consists of an arm (uniform rod with mass 250. g and length 75.0 cm) with a holder (negligible mass) at one end mounted to a hub of radius 3.00 cm and negligible mass at the other end. A string is wrapped around the hub and passes to a spring of constant ...
Friday, November 21, 2014 at 4:52pm

Physics
A volleyball court is 18 m long from baseline to baseline and the net is 2.24 m high. A volleyball player serves the ball from the baseline by hitting it at a height of 2 m above the floor at an angle of 10 degrees above the horizontal. A.) If the ball is in the air for 1.05 s...
Friday, November 21, 2014 at 4:16pm

Physics
A wheel starts from rest and rotates about its axis with constant angular acceleration. After 8.7s have elapsed, it has rotated through an angle of 20 radians. What is the angular acceleration of the wheel? What is the angular velocity when the time t = 8.7 s? I got the answer...
Friday, November 21, 2014 at 3:52pm

Physics
An iron disk has a radius of 0.625 m and a mass of 217 kg. The disk is mounted on its axis so that it is free to spin. How much force is required if the force is applied at a distance 19.5 cm from the axis of rotation?
Friday, November 21, 2014 at 3:27pm

physics
A bowling ball of mass 9 kg hits a wall going 11 m/s and rebounds at a speed of 8 m/s. What was the impulse applied to the bowling ball?
Friday, November 21, 2014 at 3:27pm

physics
A clock has a second hand whose tip rubs against the inside of the glass cover. If the frictional force between the glass cover and the tip of the second hand is 0.0010 N and the length of the hand is 6.5 cm, what is the minimum torque that must be applied to the second hand ...
Friday, November 21, 2014 at 3:21pm

physics
A 30-caliber rifle with a mass of 2.80 kg fires a 9.84- g bullet with a speed of 726 m/s with respect to the ground. What kinetic energy is released by the explosion of the gunpowder that fires the bullet?
Friday, November 21, 2014 at 2:25pm

Physics
A 24.5-kg child is standing on the outer edge of a merry-go-round which has moment of inertia 989 kg • m2 and radius 2.40 m. The entire system is initially rotating at 0.180 rev/s. Find the angular velocity if the child moves to a final position 1.10 m from the center of ...
Friday, November 21, 2014 at 1:45pm

Physics
A wheel starts from rest and rotates about its axis with constant angular acceleration. After 8.7 s have elapsed, it has rotated through an angle of 20 radians. I found that the angular velocity at 8.7 s is 4.60 rad/s. What is the angular acceleration of the wheel? What is the...
Friday, November 21, 2014 at 1:21pm

Physics
A clock has a second hand whose tip rubs against the inside of the glass cover. If the frictional force between the glass cover and the tip of the second hand is 0.0020 N and the length of the hand is 9.5 cm, what is the minimum torque that must be applied to the second hand ...
Friday, November 21, 2014 at 1:19pm

Physics
A 30-caliber rifle with a mass of 3.54 kg fires a 7.33- g bullet with a speed of 596 m/s with respect to the ground. What kinetic energy is released by the explosion of the gunpowder that fires the bullet? (Note there is a tolerance 0.1 percent for the answer)
Friday, November 21, 2014 at 1:19pm

physics
A dog sled team is pulling a sled across a flat patch of snow. The total force exerted by the four dogs is 475 N (applied horizontally). The sled (with driver on it) weighs 350 kg. and the coefficient of kinetic friction between the sled and the ground is (a) What is the ...
Friday, November 21, 2014 at 11:44am

Physics
A distant planet has a mass of 0.6400 ME and a radius of 0.9000 RE. What is the ratio of the escape speed from this planet to the escape speed from the earth?
Friday, November 21, 2014 at 11:20am

Physics
2 vectors have same magnitude.The magnitude of the resultant vector of these 2 vectors are same as either of both vectors.What is the angle between 2 vectors?
Friday, November 21, 2014 at 7:18am

physics
If the athlete lies down on the ground on his back,his weight is spread over an area of 0.75 meter square. How much pressure does he exert on the ground in this position?
Friday, November 21, 2014 at 6:06am

physics
A particle of mass and initial velocity strikes a stationary particle of mass . The collision is elastic. It is observed that after the collision the particles have equal and opposite velocities: Find (a) the ratio ; (b) the velocity of the CM (before and after the collision...
Friday, November 21, 2014 at 5:57am

physics
A car of mass 200g moving at 15.0m/s is accelerated to 25.0m/s in a time of 10.0 seconds determine the accelerating force and calculate the work done on the body
Friday, November 21, 2014 at 4:18am

physics
A 5 ft chain is sitting on a table with 2 ft hanging off (3 ft sitting on table). The table is 4 ft high, and the chain slides frictionless off the table. The chain weighs 15 lb. What is the velocity of the chain when it first hits the ground.
Friday, November 21, 2014 at 12:51am

physics
a race car starts from rest on a circular track.the car increases its speed at constant rate at as it goes 2.75 times around the track.find the angle that the total acceleration of the car makes with the radius connecting the centre of the track and the car at the moment the ...
Friday, November 21, 2014 at 12:05am

Physics
Two workers are sliding 310kg crate across the floor. One worker pushes forward on the crate with a force of 440N while the other pulls in the same direction with a force of 230N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a ...
Friday, November 21, 2014 at 12:03am

Physics
A chair of weight 85.0N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0N directed at an angle of 34.0∘ below the horizontal and the chair slides along the floor. Using Newton's laws, calculate n, the ...
Thursday, November 20, 2014 at 11:35pm

physics
A motorcross racer covers one lap of a 1200 meter track on his motorcycle at a speed of 27 meters per second. How long does it take to ride one lap: A. In seconds? B. In minutes?
Thursday, November 20, 2014 at 11:34pm

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