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October 24, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted?
Tuesday, September 23, 2014 at 9:24pm

physics
A person in a kayak starts paddling, and it accelerates from 0 to 0.577 m/s in a distance of 0.565 m. If the combined mass of the person and the kayak is 60.6 kg, what is the magnitude of the net force acting on the kayak?
Tuesday, September 23, 2014 at 9:23pm

Physics
White dwarf stars have been observed with a surface temperature as hot as 200,000 o C. What is the wavelength of the maximum intensity produced by this star? help please don't know what to do
Tuesday, September 23, 2014 at 9:18pm

Physics
A crate of mass 54 kg is attached to one end of a string, and the other end of the string runs over a pulley and is held by a person as in the figure below. If the person pulls with a force of 93 N, what is the crate's acceleration? (Assume that upward is the positive ...
Tuesday, September 23, 2014 at 9:11pm

Physics
Your friend is an environmentalist who is living in a tree for the summer. You are helping provide her with food, and you do so by throwing small packages up to her tree house. If her tree house is 21 m above the ground, what is the minimum (initial) speed you must use when ...
Tuesday, September 23, 2014 at 9:10pm

Physics
Two children are playing on a 147-m-tall bridge. One child drops a rock (initial velocity zero) at t = 0. The other waits 1.2 s and then throws a rock downward with an initial speed v0. If the two rocks hit the ground at the same time, what is v0?
Tuesday, September 23, 2014 at 9:06pm

Physics
Calculate the gravitational potential energy of the water in a lake of volume 100km^3 (mass=1.0x10^14kg). The lake has an average height of 50m above the hydroelectric generators at the base of the dam holding the water back.
Tuesday, September 23, 2014 at 9:01pm

physics
A rock dropped into a pond produces a wave that takes 15.7 s to reach the opposite shore, 24.3 m away. The distance between consecutive crests of the wave is 3.5 m. What is the frequency of the wave?
Tuesday, September 23, 2014 at 8:58pm

Physics
A hockey puck slides with an initial speed of 48 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.030, what is the speed of the puck after 11 s?
Tuesday, September 23, 2014 at 8:25pm

Physics
A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.
Tuesday, September 23, 2014 at 8:21pm

Physics
If a 6.0keV photon scatters from a fee proton at rest, what is the change in the photon's wavelength if the photon recoils at 90 degrees?
Tuesday, September 23, 2014 at 8:20pm

Physics
A television tube operates at 20,000V. What is min wavelength for the continuous x-ray spectrum produced when the electrons hit the phosphor?
Tuesday, September 23, 2014 at 8:19pm

Physics
The Stanford Linear Accelerator can accelerate electrons to 50GeV (50x10^9eV). What is the minimum wavelength of photon it can produce by bremsstrahlung? Is this photon still called an x-ray?
Tuesday, September 23, 2014 at 8:18pm

Physics
An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm. Her experiment will require photo-electrons of maximum kinetic energy 2.0eV. what frequency of light should be used to illuminate the tungsten?
Tuesday, September 23, 2014 at 8:18pm

Physics
What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?
Tuesday, September 23, 2014 at 8:17pm

Physics
An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted?
Tuesday, September 23, 2014 at 8:16pm

Physics
White dwarf stars have been observed with a surface temperature as hot as 200,000 o C. What is the wavelength of the maximum intensity produced by this star?
Tuesday, September 23, 2014 at 8:16pm

Physics
A body's temperature is increased from 900K to 1900K. By what factor does the total power radiated per unit area increase?
Tuesday, September 23, 2014 at 8:15pm

physics
An airport has runways only 196 m long. A small plane must reach a ground speed of 38 m/s before it can become airborne. What average acceleration must the plane’s engines provide if it is to take off safely from its airport? Answer in units of m/s 2
Tuesday, September 23, 2014 at 7:50pm

Physics
A projectile of mass 0.377 kg is shot from a cannon, at height 6.6 m, as shown in the figure, with an initial velocity vi having a horizontal component of 6.1 m/s. The projectile rises to a maximum height of y above the end of the cannon’s barrel and strikes the ...
Tuesday, September 23, 2014 at 7:44pm

Physics
Starting from rest, Mr.M's bus achieves a velocity of 25 m/s in a distance of 1.0 km. Find the time and the acceleration. I don't know which formula to use. Delta T = Vf - Vi / Aavg ?
Tuesday, September 23, 2014 at 7:19pm

Physics
A car is traveling at 72 km/hr. The driver begins to apply the brakes and the begins to slow with a constant acceleration (a). After the brakes are applied, the car stops in a distance of 100 m. What is the acceleration? My teacher gave the class a list of formulas but didn&#...
Tuesday, September 23, 2014 at 6:50pm

Physics
A motorcyclist traveling 35.0 m/s realizes suddenly that he is headed straight for the edge of the Grand Canyon 50.0 m away. He immediately begins to brake, decreasing his speed at a rate of 7.00 m/s^2. With what velocity will he fly off into the canyon?
Tuesday, September 23, 2014 at 6:35pm

Physics
A car enters the freeway with a speed of 7.2 m/s south and accelerates uniformly for 4.2 km in 4.0 min. How fast (in m/s) is the car moving after this time? I only need the formula. My teacher gave us a list but did not tell the class which equation is for which. Help please.
Tuesday, September 23, 2014 at 6:15pm

Physics
As you hurry to catch your flight at the local airport, you encounter a moving walkway that is 85 m long and has a speed of 2.2 m/s relative to the ground. If it takes you 68 s to cover 85 m when walking on the ground, how long will it take you to cover the same distance on ...
Tuesday, September 23, 2014 at 4:35pm

Physics
This is a vector problem. A man starts at home and runs 5 miles north and then 5 miles in a direction 23 degrees south of west. Now he wants to go back home in a straight line. How far does he need to go and in what direction? so i found that the hypotenuse equals 5.4 miles ...
Tuesday, September 23, 2014 at 4:19pm

Physics
A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.
Tuesday, September 23, 2014 at 1:16pm

Physics
If a 6.0keV photon scatters from a fee proton at rest, what is the change in the photon's wavelength if the photon recoils at 90 degrees?
Tuesday, September 23, 2014 at 1:15pm

Physics
A television tube operates at 20,000V. What is min wavelength for the continuous x-ray spectrum produced when the electrons hit the phosphor?
Tuesday, September 23, 2014 at 1:14pm

Physics
The Stanford Linear Accelerator can accelerate electrons to 50GeV (50x10^9eV). What is the minimum wavelength of photon it can produce by bremsstrahlung? Is this photon still called an x-ray?
Tuesday, September 23, 2014 at 1:12pm

Physics
An experimenter finds that no photoelectrons are emitted from tungsten unless the wavelength of light is less than 270nm. Her experiment will require photoelectrons of maximum kinetic energy 2.0eV. what frequency of light should be used to illuminate the tungsten?
Tuesday, September 23, 2014 at 1:10pm

Physics
An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm.
Tuesday, September 23, 2014 at 1:08pm

Physics
What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?
Tuesday, September 23, 2014 at 1:06pm

Physics
An FM radio station of frequency 107.7MHz puts out a signal of 50,000 W.How many photons/s are emitted?
Tuesday, September 23, 2014 at 1:02pm

Physics
White dwarf stars have been observed with a surface temperature as hot as 200,000 o C. What is the wavelength of the maximum intensity produced by this star?
Tuesday, September 23, 2014 at 1:01pm

Physics
A body's temperature is increased from 900K to 1900K. By what factor does the total power radiated per unit area increase?
Tuesday, September 23, 2014 at 12:59pm

Physics
Q1-a stone is thrown upwards into the what is the magnitude and direction of its acceleration ? Q2-if a ball is thrown horizontally from a top of a cliff and takes 3 seconds to reach the beach below. Calculate the height if the cliff by considering the vertical motion only
Tuesday, September 23, 2014 at 12:00pm

Physics
Consider a wet roadway banked as in the following figure, where there is a coefficient of static friction of 0.30 and a coefficient of kinetic friction of 0.25 between the tires and the roadway. The radius of the curve is R = 50 m. (a) If the banking angle is 25o, what is the ...
Tuesday, September 23, 2014 at 11:34am

physics
What's the momentum of a 3.5-kg boulder rolling downhill at 5 m/s?
Tuesday, September 23, 2014 at 9:55am

physics
a 700 newton man is able to climb up 4.5 meters on a 6 meters ladder before it slips. What must be the coefficient of friction be if the ladder is arranged so that it makes an angle 50 degrees with the ground? Assume the ladder to be uniform and weighing 450 newtons.
Tuesday, September 23, 2014 at 9:35am

physics
A piston of a car engine executes a simple harmonic motion. the acceleration a of the piston is related to its displacement x by the equation: a = -6.4*10^5x a) Calculate the frequency of motion b) The piston has a mass of 700 gms & a max displacement of 8 cm. Calculate the ...
Tuesday, September 23, 2014 at 9:16am

physics
From a 5 metre high smooth hill a 6 kg block slides down and stops somewhere on the horizontal ground. Effect of turning part is negligible. Find the work done while the block is pulled back from this position to the top of the hill.
Tuesday, September 23, 2014 at 4:46am

Physics
A golfball comes to rest 1.9 seconds after hitting a net. The force of the net slowed down at a rate of 56.3 m/s2. What was the velocity of the ball when it first hit the net??
Tuesday, September 23, 2014 at 2:50am

Physics
Two friends, Barbara and Neil, are out rollerblading. With respect to the ground, Barbara is skating due south at a speed of 5.2 m/s. Neil is in front of her. With respect to the ground, Neil is skating due west at a speed of 3.2 m/s. Find Neil's velocity ((a) magnitude ...
Tuesday, September 23, 2014 at 2:21am

Physics
An object is thrown upward from the top of a 10.0m high building at a speed of 10.0m/s. How fast is the object moving when it reaches the bottom of the building? The answer is 17.2 m/s but how?
Monday, September 22, 2014 at 11:29pm

physics
You are riding in the back of an open pick-up truck in the snow as you pass your friend's house. Despite the fact that it is snowing you know that he has a habit of being in his bedroom with the light on and his bedroom window open. Being as you are riding in an open truck...
Monday, September 22, 2014 at 11:24pm

physics
One of the methods used to train astronauts for the effects of "zero gravity" in space is to put them in a specially equipped plane which has been stripped of seats and fitted with padded walls. The pilot then takes the plane up to an altitude of typically 8600 ...
Monday, September 22, 2014 at 11:23pm

physics
Your opponent, in a desperate attempt to return your wicked serve, makes a high lob of the tennis ball that causes it to land out of bounds on the asphalt course behind you. It then bounces so that it just barely clears a 3.90 m wall that is 2.32 m from where the ball hit the ...
Monday, September 22, 2014 at 11:22pm

physics
In the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between station stops. The more stops there are, the slower the train's average speed. To get an idea of this problem, calculate the time it takes a train ...
Monday, September 22, 2014 at 11:21pm

physics
At serve, a tennis player aims to hit the ball horizontally. The height of the net is h=0.960 m, and server launches the ball from a height of H=2.20 m and a distance L=15.6 m from the net
Monday, September 22, 2014 at 11:07pm

Physics Help Please!!!!
a pitcher throws a softball horizontally from a height of 1.25 m and notes that it strikes the ground a distance of 15 m from the point where it was thrown. how long did it take the ball to reach the ground? what was the velocity at which the ball was thrown? what was the ...
Monday, September 22, 2014 at 11:03pm

physics
In a 100m race, Maggie and Judy cross the finish line in a dead heat, both taking 11.4s. Accelerating uniformly, Maggie took 1.80s and Judy 2.95s to attain maximum speed, which they maintained for the rest of the race. What was Maggie's acceleration?
Monday, September 22, 2014 at 10:26pm

physics
In the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between station stops. The more stops there are, the slower the train's average speed. To get an idea of this problem, calculate the time it takes a train ...
Monday, September 22, 2014 at 9:32pm

physics
Instructions for finding a buried treasure include the following: Go 73.0 paces at 234°, turn to 135° and walk 122 paces, then travel 120 paces at 167°. The angles are measured counterclockwise from an axis pointing to the east, the + x direction. Determine the ...
Monday, September 22, 2014 at 9:10pm

Physics
An ice skater skates 13.3 m southwest, then 26.6 m east, and finally 39.9 m in a direction 51.5◦ north of east. Find the magnitude of the displacement required to bring the skater back to her starting point. Answer in units of m
Monday, September 22, 2014 at 9:09pm

physics
What is the linear speed of Saturn in its orbit about the sun? Give your answer in meters per second. (Consider the orbit of Saturn to be a circle of radius 1.43×1012 m and that it takes 29.50 yr for one orbit around the sun.)
Monday, September 22, 2014 at 9:03pm

physics
As it passes over Grand Bahama Island, the eye of a hurricane is moving in a direction 60.7° north of west with a speed of 37.4km/hr. Two hours later, the course of the hurricane suddenly shifts due north and its speed slows to 21.0km/hr. How far from Grand Bahama is the ...
Monday, September 22, 2014 at 8:37pm

physics
A boy uses a slingshot to launch a pebble straight up into the air. The pebble reaches a height of 29.0 m above the launch point 3.3 seconds later. Assume air resistance is negligible.
Monday, September 22, 2014 at 5:55pm

physics
A ball is thrown directly downward with an initial speed of 3.08 m/s from a height of 14.6 m. After what interval does the ball strike the ground? The acceleration of gravity is 9.8 m/s 2
Monday, September 22, 2014 at 5:00pm

physics
A speeder passes a parked police car at a constant speed of 39.2 m/s. At that instant, the police car starts from rest with a uniform 2 is overtaken by the police car? Answer in units of s acceleration of 2.77 m/s . How much time passes before the speeder
Monday, September 22, 2014 at 2:39pm

physics
what is efficiency of carnot engine between the temperature of 100 degree centigrade and 60 degree centigrade
Monday, September 22, 2014 at 2:10pm

Physics
a frictionless mass1(1kg) is accelerated by mass two(1kg). The two masses are conceted by inextensible,flexible string. calculate the acceleration of the system of the two masses.
Monday, September 22, 2014 at 2:09pm

college physics
A 52.2 kg parachutist lands moving straight downward with a speed of 3.75 m/s. If the parachutist comes to rest with constant acceleration over a distance of 0.794 m, what force does the ground exert on her?
Monday, September 22, 2014 at 1:23pm

physics
The masses of these particles are mA = 374 kg, mB = 516 kg, and mC = 155 kg. d1 = 0.414 m and d2 = 0.207 m. Calculate the magnitude of the net gravitational force acting on particle A.
Monday, September 22, 2014 at 12:49pm

physics
A car has a mass of 1500 kg. If the driver applies the brakes while on a gravel road, the maximum friction force that the tires can provide without skidding is about 7000 N. If the car is moving at 18 m/s, what is the shortest distance in which the car can stop safely?
Monday, September 22, 2014 at 12:24pm

physics
A stone is dropped from peak of the hill. It covers a distance of 30 metres in the last second of its motion. Find the height of the peak?
Monday, September 22, 2014 at 8:36am

physics
if the coeffiecient of friction between a 32kg metal plate and the floor is 0.16, what force is required to roll this metal plate across the floor at a uniform speed? how much work is done if the metal plate is rolled to a distance of 15m? Please response i need your help.
Monday, September 22, 2014 at 7:18am

Physics
Find the pressure exerted by a waterbed with dimensions of 2 m x 2 m which is 30 cm thick. (hint: use density of water)
Monday, September 22, 2014 at 6:34am

Physics
An 80.0 kg rollerblader is at rest at the top of a 100 m hill at a 7o incline. The coefficient of friction on the hill is 0.110. What is the roller blader's kinetic energy at the bottom of the hill?
Monday, September 22, 2014 at 2:29am

physics
A football is thrown with an initial upward velocity component of 15.0m/s and a horizontal velocity component of 17.0m/s . a:How much time is required for the football to reach the highest point in its trajectory? b:How high does it get above the ground? c:How much time after ...
Monday, September 22, 2014 at 12:49am

physics
A military helicopter on a training mission is flying horizontally at a speed of 75.0m/s when it accidentally drops a bomb (fortunately, not armed) at an elevation of 310m . You can ignore air resistance. a:How much time is required for the bomb to reach the earth? b:How far ...
Monday, September 22, 2014 at 12:46am

college physics
tennis ball rolls off the edge of a tabletop 0.900m above the floor and strikes the floor at a point 1.60m horizontally from the edge of the table. A: Find the time of flight of the ball B: Find the magnitude of the initial velocity of the ball. C: Find the magnitude of the ...
Monday, September 22, 2014 at 12:44am

Physics
In order to qualify for the finals in a racing event, a race car must achieve an average speed of 230 km/h on a track with a total length of 1810 m. If a particular car covers the first half of the track at an average speed of 245 km/h, what minimum average speed must it have ...
Monday, September 22, 2014 at 12:20am

physics
A speedy tortoise can run at 0.08 m/s, and a hare can run 15 times as fast. In a race, they start at the same time, but the hare stops to rest for 1.8 min, so the tortoise wins by a shell (20 cm). How long does the race take? Answer in units of s What is the length of the race...
Monday, September 22, 2014 at 12:04am

physics
In order to qualify for the finals in a racing event, a race car must achieve an average speed of 276km/h on a track with a total length of 1520m. If a particular car covers the first half of the track at an average speed of 246km/h, what minimum average speed must it have in ...
Sunday, September 21, 2014 at 11:35pm

physics
A ball is thrown straight upward. At 4.36 m above its launch point, the ball's speed is one-half its launch speed. What maximum height above its launch point does the ball attain?
Sunday, September 21, 2014 at 11:21pm

Physics
How long does it take a vehicle with 40hp to achieve 25m/s(meters per second)?
Sunday, September 21, 2014 at 10:45pm

Physics
The velocity of the transverse waves produced by an earthquake is 6.13 km/s, while that of the longitudinal waves is 9.9919km/s. A seismograph records the arrival of the transverse waves 61.5 seconds after that of the longitudinal waves. How far away was the earthquake? ...
Sunday, September 21, 2014 at 10:34pm

Physics
What is the coefficient of friction between a sled and a plane inclined 30 degrees from the horizontal if the sled just slides without accelerating when given an initial push?
Sunday, September 21, 2014 at 10:28pm

physics
i'm having a lot of trouble with these and can't seem to figure them out no matter how many times i replace variables in my equations and write down what i know and need and i don't know what to do about it anymore. The speed of a boat undergoing constant ...
Sunday, September 21, 2014 at 10:24pm

physics
traveling 7.7 meters per second, decelerate at 1.5 meters per second squared, how long til get back to starting point.
Sunday, September 21, 2014 at 10:22pm

physics
A speedy tortoise can run at 0.08 m/s, and a hare can run 16 times as fast. In a race, they start at the same time, but the hare stops to rest for 2 min, so the tortoise wins by a shells(20cm). How long does the race take? Answer in units of s
Sunday, September 21, 2014 at 10:09pm

physics
In the figure, a ball is thrown leftward from the left edge of the roof, at height h above the ground. The ball hits the ground 1.52 s. later, at distance d = 30.5 m from the building and at angle θ = 61° with the horizontal.
Sunday, September 21, 2014 at 9:46pm

Physics
Obi-Wan lands his spacecraft on an unknown planet. Visibility is poor, so he isn't able to exactly determine on which planet he has landed. He finds someone on a local communications channel and asks for directions to Earth. "You are already on Earth," is the ...
Sunday, September 21, 2014 at 9:42pm

Physics
The two masses shown in the figure are each initially 1.80 m above the ground, and the massless frictionless pulley is fixed 4.8 m above the ground. (mA = 1.5 kg and mB = 3.4 kg.) What maximum height does the lighter object reach after the system is released? [Hint: First ...
Sunday, September 21, 2014 at 9:40pm

Physics Help Please!!!!
a pitcher throws a softball horizontally from a height of 1.25 m and notes that it strikes the ground a distance of 15 m from the point where it was thrown. how long did it take the ball to reach the ground? what was the velocity at which the ball was thrown? what was the ...
Sunday, September 21, 2014 at 9:35pm

Physics
A baseball is hit with a velocity of 30 m/s at an angle of 38.2 degrees above the horizontal. An outfielder, who happens to be very good at 2D Kinematics, figures out exactly where its going to land.Knowing he is exactly 8 meters away from the landing point, and that his ...
Sunday, September 21, 2014 at 9:25pm

Physics
The mass of the Earth=Mg=5.97x10^24 kg. The radius of the Earth=RE= 6.38 x10^6 m. A) What is the weight of the 75 kg person? B) Determine the acceleration due to gravity aboard a space shuttle at an altitude of 400km.
Sunday, September 21, 2014 at 9:25pm

Physics
If a block of mass 10.0 kg rests on a horizontal surface, and the coefficient of static friction is 0.300, what is the maximum static friction that can act on the block? If you could walk me step by step on completing this problem, I would be extremely grateful and it would be...
Sunday, September 21, 2014 at 8:46pm

College Physics
A Balloon carrying a basket is descending at a constant velocity of 20.0 m/s. A person in the basket throws a stone with an initial velocity of 15.0 m/s horizontally perpendicular to the path of descending balloon and 4.00 (s) later this person sees the stone strike the ground...
Sunday, September 21, 2014 at 8:45pm

Physics
The nozzle of a fountain jet sits in the center of a circular pool of radius 3.50 m. If the nozzle shoots water at an angle of 65 degrees. A) What is the maximum speed of the water at the nozzle that will allow it to land within the pool?
Sunday, September 21, 2014 at 8:17pm

Physics
As two boats approach the marina, the velocity of boat 1 relative to boat 2 is 2.20m/s in a direction 47.0 ∘ East of North. If boat 1 has a velocity that is 0.745m/s due North, what is the(magnitude and direction) of boat 2?
Sunday, September 21, 2014 at 8:04pm

PHYSICS
Use dimensional analysis to determine the pressure, P, in the pipe to within a dimen- sionless multiplicative constant of order 1.(Hint: P may depend on another physical variable besides A and R.) Using your result from part (a), reexpress your answer in a form that involves v...
Sunday, September 21, 2014 at 7:56pm

Physics I
A ball has been thrown upward. Which of the following is true while the ball is on the way up, after the ball has been released, assuming no air resistance? a. The acceleration is upward. b. The acceleration is zero. c. The ball's speed increases by 9.81 m/s each second. d...
Sunday, September 21, 2014 at 7:49pm

Physics
A Balloon carrying a basket is descending at a constant velocity of 20.0 m/s. A person in the basket throws a stone with an initial velocity of 15.0 m/s horizontally perpendicular to the path of descending balloon and 4.00 (s) later this person sees the stone strike the ground...
Sunday, September 21, 2014 at 7:42pm

physics
A baseball hit just above the ground leaves the bat at 22 m/s, at 53.6° above the horizontal. What is the maximum height of the ball above the ground? Help!!!
Sunday, September 21, 2014 at 7:36pm

physics
"A projectile is fired horizontally at 14.9 m/s from the edge of a 7.05-m-high cliff and strikes the ground. Find the horizontal distance the projectile traveled." I have no work cause I have no idea how to do this...
Sunday, September 21, 2014 at 7:30pm

physics
a bus travels 280 km south along a straight path with an avg velocity of 88 km/h to the south. then it travels 210 km south with an avg velocity of 75 km/h to the south. a) how long does the 1st trip last? b) how long does the 2nd trip last? c) what is the avg velocity for the...
Sunday, September 21, 2014 at 7:28pm

physics
Initially, a particle is moving at 4.20m/s at an angle of 34.5∘ above the horizontal. Two seconds later, its velocity is 6.50m/s at an angle of 50.0∘ below the horizontal. What was the particle's average acceleration during these 2.00 seconds?
Sunday, September 21, 2014 at 7:28pm

physics
an automobile with an initial speed of 43 cm/s (accelerates uniformly at the rate of 3m/s^2). what is the final speed and the displacement after 5 sec?
Sunday, September 21, 2014 at 7:24pm

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