Sunday
February 14, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

AP Physics 1
In the javelin throw at a track-and-field event, the javelin is launched at a speed of 33 m/s at an angle of 32° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is ...
Wednesday, October 14, 2015 by Anonymous

physics
Why is voltmeter made of high resistance?
Wednesday, October 14, 2015 by sujal

physics
Why is voltmeter connected in parallel in electric circuit?
Wednesday, October 14, 2015 by sujal

physics
Sound wave with greater amplitude travels farther than that with smaller amplitude?
Wednesday, October 14, 2015 by sujal

Physics
A man exerts an effort of 250 Newtons through a distance of 4 meters to lift a load of 1000 Newtons through a height of 0.75 meters. Calculate the velocity ratio. I'm thinking i divide the 4 meters(displacement of effort)/0.75 meters (displacement of load)
Wednesday, October 14, 2015 by Cortney

Physics
Gun fires at 400m /sec.What is the range of the gun shen elevated at an angle of 30 degrees.
Wednesday, October 14, 2015 by Carlene

physics
Suppose that a net force F gives an object with a mass of m an acceleration of 9.65 m/s/s. Suppose that the net force were increased by a factor of 4.7, and the mass were increased by a factor of 3.0. What would be the new acceleration (in m/s/s)? Please help, for I do not ...
Wednesday, October 14, 2015 by Janice

Physics
Remember the Poynting vector? The magnitude of this vector gives the amount of energy per second that flows through a unit area (in the direction it gives) because of the presence of a combination of electric and magnetic field, like in an electro-magnetic wave. The units for ...
Wednesday, October 14, 2015 by Ryan

Physics
If there was a way to accelerate a spaceship close to the speed of light to go visit some neighboring star system, one would still face the problem that every particle the spaceship finds on its way will be a projectile hitting it with almost the speed of light, causing ...
Wednesday, October 14, 2015 by Ryan

Physics
A permanent magnet creates a homogenous magnetic field B~ inside a rectangular region. The magnet is moving with a velocity ~v ⊥ B~ . A particle at rest with mass m and charge Q is on the path of the magnet. Assume that the magnet has a mass much larger than the particle...
Wednesday, October 14, 2015 by Ryan

PHYSICS
On a banked race track, the smallest circular path on which cars can move has a radius of 114 m, while the largest has a radius of 170 m, as the drawing illustrates. The height of the outer wall is 17.5 m. Find (a) the smallest and (b) the largest speed at which cars can move ...
Wednesday, October 14, 2015 by Anonymous

physics
6. Calculate the gravitational force between you (weight: 140 lb) and your classmate (125 lb) sitting 20 inches apart on a bench. Answer must be in standard metric units. I dont want the answer can you just explain how to put it together and how do I add G Which is 6.67x10^-11
Wednesday, October 14, 2015 by Anonymous

physics
Suppose the stone is thrown at an angle of 30.0 degrees below the horizontal. If it strikes the ground 57.0 m away, find (a) the time of flight, (b) the initial speed, and (c) the speed and the angle of the velocity vector with respect to the horizontal at impact. (Hint: ...
Wednesday, October 14, 2015 by Adam

Physics
On a banked race track, the smallest circular path on which cars can move has a radius of 114 m, while the largest has a radius of 170 m, as the drawing illustrates. The height of the outer wall is 17.5 m. Find (a) the smallest and (b) the largest speed at which cars can move ...
Wednesday, October 14, 2015 by Anonymous

Physics
A uniform 4m plank with a mass of 45 kg is supported at its ends by two ladders. Two 75 kg men are standing on the plank. One is 1 m from one end and the other is 1.5 m from the other end. Determine the forces exerted by the ladders.
Wednesday, October 14, 2015 by Maya

Physics
A block of mass m = 5.0 kg is pulled along a rough horizontal surface by a rope as sketched in the figure below. ( rope is at a 30 degree angle from the horizontal) The tension in the rope is 50 N, and the coefficient of kinetic friction between the block and the surface is &#...
Wednesday, October 14, 2015 by Wrenn

physics
a force of 100.0N act in a direction at an angle of 45 degrees with the x axis. What is the magnitude of the x component of force. I got 70.7 but I think I am wrong can you tell me
Wednesday, October 14, 2015 by cody

PHYSICS
Car A uses tires for which the coefficient of static friction is 0.399 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 10.4 m/s. Car B uses tires for which the coefficient of static friction is 0.831 on the same curve. What is ...
Wednesday, October 14, 2015 by Anonymous

Physics
Resolve a force of 23 N at 180 degrees and a force of 47 N at 270 degrees.
Wednesday, October 14, 2015 by Jason

Physics
A 75 kg man sits at one end of a uniform seesaw pivoted at its center, and his 24 kg son at the other end. Where would his 55kg wife have to sit to balance the seesaw?
Wednesday, October 14, 2015 by Maya

PHYSICS
At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.78 m/s, and an 63.5-kg person feels a 528-N ...
Wednesday, October 14, 2015 by Anonymous

Physics
Two particles of mass 5 g and 10 g respectively are joined by a light string which passes through a small hole on a smooth table. The smaller particle describes a circle of radius R on the table at a rate of 4 revolutions per second while the heavier particle hangs at rest ...
Wednesday, October 14, 2015 by an

Physics
a student performing the centripetal force experiment added some mass to the 25.0g acceleration block. when he did the experiment, he found that the speed at which the accelerated block separate from the magnet was 102 m/s^2. The radius of the circular motion before breakaway ...
Wednesday, October 14, 2015 by Layla Smith

Physics
a student performing the centripetal force experiment added some mass to the 25.0g acceleration block. when he did the experiment, he found that the speed at which the accelerated block separate from the magnet was 102 m/s^2. The radius of the circular motion before breakaway ...
Wednesday, October 14, 2015 by parna deljo

Physics
A golf ball strikes a hard, smooth floor at an angle of 20.7 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.0528 kg, and its speed is 40.2 m/s just before and after striking the floor. What is the magnitude of the impulse applied to the ...
Wednesday, October 14, 2015 by John

Physics
Two blocks M1 and M2 are connected by a massless string that passes over a massless pulley as shown in the figure. M1 has a mass of 8.25 kg and rests on an incline of 73.5°. M2 rests on an incline of 15.5°. Find the mass of block M2 so that the system is in equilibrium...
Wednesday, October 14, 2015 by meg

PHYSICS
A skier is gliding along at 2.0 m/s on horizontal, frictionless snow. He suddenly starts down a 10 ∘ incline. His speed at the bottom is 15 m/s . a).What is the length of the incline? b).How long does it take him to reach the bottom? (Please show work)
Tuesday, October 13, 2015 by Meg

Physics
When it comes to a ballistic pendulum, why would it be justified to say that the momentum in the horizontal direction is conserved over the collision interval? I think it's because of the law of conservation of linear momentum, but I feel like there is more to it than that...
Tuesday, October 13, 2015 by Stevie

physics
a 2.00 * 10^5 kg lunar landing craft is about to touch down on the surface of the moon
Tuesday, October 13, 2015 by ali

Physics
A cargo plane is moving with a horizontal velocity of vx = +223 m/s at a height of y = 980 m above level ground as shown in the figure below when it releases a package. Ignoring air resistance, how much time will it take the package to reach the ground? (Express your answer to...
Tuesday, October 13, 2015 by Mariah

Physics
The Asian Silver Carp is an invasive species of fish which has infested a number of American rivers. The disturbance of passing boats has been known to make these fish leap large distances out of the water. One such fish leaps with an initial velocity at the water's ...
Tuesday, October 13, 2015 by Mariah

Physics
The place kicker on a football team kicks a ball from ground level with an initial speed of 22.40 m/s at an angle of 15.0° above the horizontal. How far does the ball travel in the x-direction before it lands on the ground again? You may neglect air resistance.
Tuesday, October 13, 2015 by Mariah

physics
While John is traveling along a straight interstate highway, he notices that the mile marker reads 256 km. John travels until he reaches the 144 km marker and then retraces his path to the 173 km marker. What is John’s resultant displacement from the 256 km marker? How ...
Tuesday, October 13, 2015 by eric

Revolution and frequency i need help physics
A spring makes 60 revolution in 15mins calculate the period and the frequency of the revolution??
Tuesday, October 13, 2015 by Collins

physics
A person pushes a 16.5-kg shopping cart at a constant velocity for a distance of 36.6 m on a flat horizontal surface. She pushes in a direction 27.9 ° below the horizontal. A 48.1-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force ...
Tuesday, October 13, 2015 by Kim

physics
A pendulum bob of mass 100g is pulled to a vertical height of 5m from the horizontal and released.calculate th maximum potiential energy. 2.The maximum speed of the bob
Tuesday, October 13, 2015 by kayumba

physics
a stone is dropped from the top of a cliff. it is seen to hit the ground 3.5 seconds later. how high is the cliff
Tuesday, October 13, 2015 by Anonymous

physics
The ball is in the pool (point A) to the edge of which is an observer (point B). A minimum distance ball from the edge of the pool is 36 m (point C), and an observer to that point has to walk along the edge of 42 m. a) If the speed of walking along the edge of the pool of 1.5 ...
Tuesday, October 13, 2015 by ruza

physics
A softball having a mass of 0.25 kg is pitched at 95 km/h. By the time it reaches the plate it may have slowed 10%. neglecting gravity, estimate the average force of air resistance during a pitch. if the distance between the plate and the pitcher is about 15 m.
Tuesday, October 13, 2015 by joyce

Physics
A car is traveling around a horizontal circular track with radius r = 270 m as shown. It takes the car t = 66 s to go around the track once. The angle θA = 19° above the x axis, and the angle θB = 56° below the x axis. 1What is the magnitude of the car’s...
Tuesday, October 13, 2015 by Harman Preet

physics
If 200 cm3 of tea at 95°C is poured into a 150-g glass cup initially at 25°C, what will be the common final temperature T of the tea and cup when equilibrium is reached, assuming no heat flows to the surroundings
Tuesday, October 13, 2015 by jay

Physics
A baseball is hit off the edge of a cliff horizontally at a speed of 30 m/s. It takes the ball 3 seconds to reach the ground, with no air resistance. How high is the cliff wall?
Monday, October 12, 2015 by Francesca

physics
if you use a horizontal force of 30 N to slide a 12 kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor?
Monday, October 12, 2015 by carly

physics
A 25-kg bullet traveling shoots into a physics textbook that is 3.5 cm wide, and exits the textbook traveling 40 m/s. Poor defenseless textbook! (A) What was the magnitude of the average deceleration of the bullet while it was penetrating through the textbook? (B) What was the...
Monday, October 12, 2015 by Tiara

urgent physics help
when the full moon directly overhead the angle from one edge of the moon to the other is measured to be 0.6970 if the diameter of the moon is 3650 km how far is it from the moon
Monday, October 12, 2015 by Anonyomous

Physics
An Object of mass 7 kg is pushed along a surface up to a velocity of + 10 m/s before it is let go. It then slows to a stop due to an 11-N frictional force. How long until it comes to a stop?
Monday, October 12, 2015 by Erin

Physics
A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +3.2. What is the magnification when the convex side is used as a mirror, the object remaining the same distance from the mirror? If the object is inverted, then enter...
Monday, October 12, 2015 by Anonymous

Physics
An object is placed to the left of a lens, and a real image is formed to the right of the lens. The image is inverted relative to the object and is one-half the size of the object. The distance between the object and the image is 95 cm. (a) How far from the lens is the object...
Monday, October 12, 2015 by Anonymous

Physics
Can anyone help me here? I have no idea where to start! Light in a vacuum is incident on a transparent glass slab. The angle of incidence is 35.1°. The slab is then immersed in a pool of liquid. When the angle of incidence for the light striking the slab is 21.1°, the ...
Monday, October 12, 2015 by Anonymous

Physics
A bird wants to rech its nest that is located 53 meters (35 degrees south of west) from where it is perched. If the maximum speed that the bird can fly with respect to the air is 12m/s and there is a wind blowing from a direction of east 35 degrees south at a speed of 8.1 ...
Monday, October 12, 2015 by Carla

Physics
A car traveling at 40 m/s runs out of gas while traveling up a 7.0 ∘ slope How far will it coast before starting to roll back down?
Monday, October 12, 2015 by raquel

Science - Physics
Find the x-component of vector v⃗ = (310 m/s , 45 ∘ above +x-axis).
Monday, October 12, 2015 by Shiv

Physics
A particle rotates in a circle with centripetal acceleration a = 8.8 m/s2 . What is a if the radius is doubled without changing the particle's speed? What is a if the speed is doubled without changing the circle's radius?
Monday, October 12, 2015 by Shiv

physics
A 56-kg rollerblader skates across a skating rink floor. The graph below shows the net external force component F cos è along the displacement as a function of the magnitude of the displacement d. Determine the Following: (a) work done by the net force component F cos &...
Monday, October 12, 2015 by John

Physics
Determine the stopping distances for a car with an initial speed of 93 km/h & human reaction time of 0.80 s, for an acceleration a=−4.0m/s2.?
Monday, October 12, 2015 by Kelly

Physics
A 1300 kg El Camino is parked on a 20 degree hill.(20 degrees above x axis)The driver of the El Camino returns, starts the car, and accelerates up the hill at 2 m/s^2. Find Sigma-Fx and Sigma-Fy. What is the normal Force acting on the car, and what is the force being supplied ...
Monday, October 12, 2015 by Jose Luis

Physics
A colony of troglodytes has been in a lengthy feud with its neighbors on the adjacent cliff. Colony A finally develops an important military breakthrough: it rolls bombs off its cliff at known rates of speed, thus gaining pinpoint accuracy in its attacks. If the cliffs are ...
Monday, October 12, 2015 by Luma

Physics
A fireman, 43.7 m away from a burning building, directs a stream jet of water from a ground level fire hose at an angle of 31.3 degree above the horizontal. If the speed of the stream as it leaves the hose is 44.1 m/s, at what height will the stream of water strike the ...
Monday, October 12, 2015 by Luma

Physics
One of the fastest recorded pitches in major-league baseball, thrown by Nolan Ryan in 1974, was clocked at 96.8 mi/h. The acceleration of gravity is 32 ft/s^. If a pitch were thrown horizontally witha velocity of 96.8 mi/h, how far would the ball fall vertically by the time it...
Monday, October 12, 2015 by Luma

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 4.8 m waterfall. The spy's speed is 13 m/s and the officials' speed is 25 ...
Monday, October 12, 2015 by Luma

Physics
A pelican flying along a horizontal path drops a fish from a height of 3.3 m. The fish travels 8.2 m horizontally before it hits the water below. What was the pelican's initial speed? The acceleration of gravity is 9.81 m/s^. Answer in units of m/s. If the pelican was ...
Monday, October 12, 2015 by Luma

Physics
A body moving with uniform acceleration has a velocity of 16.9 cm/s when its x coordinate is 3.1 cm. If its x coordinate 3.18 s later is -4.72 cm, what is the x-component of its acceleration?
Monday, October 12, 2015 by Destiny

Physics
An autographed baseball rolls off of a 0.59 m high desk and strikes the floor 0.10 m away from the desk. How fast was it rolling on the desk before it fell off? The acceleration of gravity is 9.81 m/s^ Answer in units of m/s.
Monday, October 12, 2015 by Luma

Physics
An artillery shell is fired at an angle of 26.8 degree above the horizontal ground with an initial speed of 1720 m/s. The acceleration of gravity is 9.8 m/s^. Find the total time of flight of the shell, neglecting air resistance. Answer in units of min. Find its horizontal ...
Monday, October 12, 2015 by Luma

Physics
A ball of mass 0.4 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker's foot is 17 m/s at angle of 35 degree above the horizontal. The top of the fence is 3 m high. The ball hits...
Monday, October 12, 2015 by Luma

Physics
A 64-kg boy and a 49-kg girl use an elastic rope while engaged in a tug-of-war on an icy frictionless surface. If the acceleration of the girl toward the boy is 3.8 m/s2, determine the magnitude of the acceleration of the boy toward the girl.
Monday, October 12, 2015 by Chuck

PHYSICS
A car travels at a constant speed around a circular track whose radius is 2.82 km. The car goes once around the track in 364 s. What is the magnitude of the centripetal acceleration of the car?
Monday, October 12, 2015 by Anonymous

Physics
Tammy leaves the office, drives 21 Km due north, then turns onto a second highway and continues in a direction of 31 degree north of east for 87 Km. What is her total displacement from the office? Answer in units of Km.
Monday, October 12, 2015 by Luma

Mabel hill, physics
Two force,3N and 4N act on a body in the direction due north and east respectively. Calculate their equilibrium?
Monday, October 12, 2015 by Gift

Physics
A girl delivering newspapers travels 3 blocks west, 3 blocks north, then 6 blocks east. What is the magnitude of her resultant displacement? Answer in units of blocks.
Monday, October 12, 2015 by Luma

Physics
What is the magnitude of the vertical component of velocity of the plane? Answer in units Km/h
Monday, October 12, 2015 by Luma

Physics
A truck travels beneath an airplane that is moving 140 Km/h at an angle of 15 degree to the ground. How fast must the truck travel to stay beneath the airplane? Answer in units of Km/h.
Monday, October 12, 2015 by Luma

physics help
The distance between the midponts of two metal balls.P and Q,respectively of masses 55 kg and 70 kg is 80 cm calculate the gravitational force that P exerts on Q7 (b)give only the magnitude of the force that Q exerts on P (c)if Q Is now replaced by a ball that 1/2 its ...
Monday, October 12, 2015 by kem

physics
WHat is the displacement of a car that starts at 10m/s east and accelerates at 3m/s west for 2s
Monday, October 12, 2015 by jolie

Physics
A 60 kg is pushed 12m across a horizontal floor by a horizontal force of 200N. The coefficient of kinetic friction is 0.3. How much work went into overcoming friction and how much work went into accelerating the box.
Monday, October 12, 2015 by Ali

Physics
An Object moves along x-axis such that its position varies with time according to the relation x=50t-5t^2.Here x is in meters and t in seconds.Average Speed between t=0 to t=6s.
Monday, October 12, 2015 by Jeet Shah

physics
A container holds 1.9 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 8.0x10-3 kg bullet with a speed of 960 m/s. What is the Kelvin temperature of the gas? do I use the formula? T= (mv^2)/u No 3k
Monday, October 12, 2015 by james

Physics
The filament in an incandescent light bulb is made from tungsten (resistivity 5.6 x 10-8 Ù·m). The light bulb is plugged into a 120-V outlet and draws a current of 2.36 A. If the radius of the tungsten wire is 0.00464 mm, how long must the wire be? restivity of ...
Monday, October 12, 2015 by james check please

Physics
Identical +2.83 μC charges are fixed to adjacent corners of a square. What charge (magnitude and algebraic sign) should be fixed to one of the empty corners, so that the total potential at the remaining empty corner is 0 V? φ =k•q/r φ1+ φ2 + φ3 =0...
Monday, October 12, 2015 by james

Ap physics
A ball rolls down an incline with an acceleration of 10 cm/s^2. If it starts with an initial velocity of 0 cm/s and has a velocy of 50 cm/s when it reaches the bottom of the ramp, how long is the ramp?
Sunday, October 11, 2015 by Jasmine

physics
A dart leaves the barrel of a blowgun at a speed v. The length of the blowgun barrel is L. Assume that the acceleration of the dart in the barrel is uniform. If the darts exit speed is 17 m/s and the length of the blowgun is 1.10 m, find the time the dart is in the barrel.
Sunday, October 11, 2015 by nancy

Physics
An Earth satellite moves in a circular orbit 765 km above the Earth's surface. The period of the motion is 99.9 min. (a) What is the speed of the satellite? ______ m/s (b) What is the magnitude of the centripetal acceleration of the satellite? ______m/s^2
Sunday, October 11, 2015 by Corey

physics
A ball is projected upward at time t = 0 s, from a point on a flat roof 10 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground. The initial velocity of the ball is Consider all quantities as positive in ...
Sunday, October 11, 2015 by jose

Physics
When the Sun is directly overhead, a hawk dives toward the ground at a speed of 2.18 m/s. If the direction of his motion is at an angle of 25.1◦below the horizontal, calculate the speed of his shadow along the ground. Answer in units of m/s
Sunday, October 11, 2015 by Natasha

Physics
A factory worker pushes a 32.0 kg crate a distance of 4.9 m along a level floor at constant velocity by pushing downward at an angle of 32 ∘ below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.25. What magnitude of force must the ...
Sunday, October 11, 2015 by octavio

physics
"A 3.5 kg monket is suspended motionless 35 meter above the ground by holding two vines (a vertical vine and a diagonal vine)" We need to find the tension force in the diagonal vine as well as the angle of the diagonal vine with respect to the y axis. I'm having ...
Sunday, October 11, 2015 by ana

Physics
An explorer is stranded in the desert. A rescue service has located him using GPS, but can reach him only by plane. A supply package is kicked out the door of the plane while while it is flying at a speed of 61.7 m/s at an altitude of 35 m. Does the package fall straight down?
Sunday, October 11, 2015 by Lindsey

physics
The problem propmpts us with the info: "Two friends play with a card-board box on a grassy hill side. The boy in the box has a mass of 50.0 kg and the box has a mass of 5.00 kg. The incline of the hill is 44° and its height is 10 meter. Assume that friction plays a ...
Sunday, October 11, 2015 by ana

physics
A person takes a trip, driving with a constant speed of 93.5 km/h except for a 21.0 min rest stop. If the person's average speed is 69.8 km/h, how much time is spent on the trip and how far does the person travel?
Sunday, October 11, 2015 by Emma

Physics
A rocket has put your spacecraft in a circular orbit around Earth at an altitude of 350 km. Calculate the force due to gravitational between the Earth and the spacecraft in N if the mass of the spacecraft is 2450 kg.
Sunday, October 11, 2015 by Kay

Physics
A knight sits on a castle wall during a siege. To while away the time, he notes that boul- ders catapulted from below land on the top of his wall with a vertical velocity of 8.3 m/s. If he is 41 m above the catapult, what is the initial velocity of the boulders? The ...
Sunday, October 11, 2015 by Chanelle

Physics
A box has a weight of 120 N and is being pulled across a horizontal floor by a force that has a magnitude of 100 N. The pulling force can point horizontally, or it can point above the horizontal at an angle θ. When the pulling force points horizontally, the kinetic ...
Sunday, October 11, 2015 by Erne

physics
The driver of a car wishes to pass a truck that is traveling at a constant speed of 19.0 m/s . Initially, the car is also traveling at a speed 19.0 m/s and its front bumper is a distance 24.3 m behind the truck's rear bumper. The car begins accelerating at a constant ...
Sunday, October 11, 2015 by elif

Physics
A simple pendulum has a bob of mass M. The bob is on a light string of length l. The string is fixed at C. At position A, the string if horizontal and the bob is at rest. The bob is released from A and swings to B, where the string is vertical. The tension in the string when ...
Sunday, October 11, 2015 by Kyle

Physics
A 45 kg girl is sitting on one end of a see-saw, 0.6 m away from the the pivot pt. How far away form the pivot pt must a 60 kg boy sit on the other side in order for the see saw o be balanced?
Sunday, October 11, 2015 by Hannah

Physics
a uniform meter stick is at rotational equilibrium when 220 g is suspended at 5 com, 120 g is suspended at 90, and the support stand is placed at the 40 cm mark what is the mass of the meter stick?
Sunday, October 11, 2015 by Hannah

physics help
The distance between the midponts of two metal balls.P and Q,respectively of masses 55 kg and 70 kg is 80 cm calculate the gravitational force that P exerts on Q answer F=Gm1m2/r^2 F=(6,67x10^-11)(55kg)(70kg)/(80cm) F=4.01x10^-11..... Is it correct is correct (b)give only the ...
Sunday, October 11, 2015 by angel

physics help
A block of mass 5 kg is place on a table top.it is attached to a mass piece of 2kg by a light string that passes over a frictionless pulley.the table top exerts a frictional force of 7 N on the block. calculate the tension in the string.
Sunday, October 11, 2015 by happy

Physics
A child climbs up a set of stairs and reaches a height of 2.5m what is the child's gain I potential energy ?
Sunday, October 11, 2015 by Caroline

Physics (Thin Film Interference)
A layer of transparent plastic (n=1.61) on glass (n=1.52) looks dark when viewed in reflected light whose wavelength is 589 nanometers in vacuum. Find the two smallest possible nonzero values for the thickness of the layer. Answers are 183 nm and 366 but I don't understand...
Sunday, October 11, 2015 by Richard

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