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November 23, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
A body of mass 20 kg moving with a velocity of 80 m/s collied with another body mass of 5 kg moving with a velocity of 50 m/s. If they move together after colision. Find common velocity.
Wednesday, September 24, 2014 at 9:27am

physics
A soccer ball rolling across a field with an acceleration of -0.5m/s/s rolls 12.5 m and then comes to a stop after 8 seconds. What was the ball's initial speed?
Wednesday, September 24, 2014 at 9:18am

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.
Wednesday, September 24, 2014 at 8:42am

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?
Wednesday, September 24, 2014 at 8:41am

Physics
White dwarf stars have been observed with a surface temperature as hot as 200,000 degree C. What is the wavelength of the maximum intensity produced by this star?
Wednesday, September 24, 2014 at 8:41am

physics
If a stone is attached with a string and oscillates in to and fro motion then if the string cuts when the stone is at its highest position then what will be the path of the stone to be travelled
Wednesday, September 24, 2014 at 7:12am

Physics MCAT, Help please
A box of mass m = 6kg slides with speed v = 4 m/s across a frictionless floor. It suddenly explodes into two pieces. One piece, with mass m1 = 2kg moves in the same direction with speed v1 = 8m/s. Find the velocity of the second piece. Its answer is 2 m/s , but I dont know how...
Wednesday, September 24, 2014 at 3:54am

Physics
The biggest stuffed animal in the world is a snake 420 m long, constructed by Norwegian children. Suppose the snake is laid out in a park as shown in the figure below, forming two straight sides of a 114° angle, with one side 220 m long. Olaf and Inge run a race they ...
Wednesday, September 24, 2014 at 3:18am

Physics of Modern Technology
1) In a conventional explosion, when each molecule of high explosive chemically reacts, it produces about 4 x 10-18 J (joules) of energy. If each molecule of high explosive weighs as much as a single uranium 235 atom, and each uranium atom releases about 4 x 10-11 J in a ...
Wednesday, September 24, 2014 at 2:18am

physics
An airplane with a speed of 53.8 m/s is climbing upward at an angle of 42° with respect to the horizontal. When the plane's altitude is 840 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point of...
Wednesday, September 24, 2014 at 1:37am

physics
Two canoeists start paddling at the same time and head toward a small island in a lake. Canoeist 1 paddles with a speed of 1.40m/s at an angle of 45 degrees north of east. Canoeist 2 starts on the opposite shore of the lake, a distance of 1.5 km due east of canoeist 1. A) In ...
Wednesday, September 24, 2014 at 1:33am

physics
A book of mass 7 kg rests on a plank. You tilt one end of the plank and slowly increase the angle of the tilt. The coefficient of static friction between the book and the plank is 0.40. What is the maximum angle of tilt for which the book will remain stationary and not slide ...
Wednesday, September 24, 2014 at 1:16am

physics
A flatbed truck is supported by its four drive wheels, and is moving with an acceleration of 7.4 m/s2. For what value of the coefficient of static friction between the truck bed and a cabinet will the cabinet slip along the bed surface?
Wednesday, September 24, 2014 at 1:09am

physics
A spacecraft is traveling with a velocity of v0x = 5690 m/s along the +x direction. Two engines are turned on for a time of 845 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.35 m/s2, while the other gives it an acceleration in the +y ...
Wednesday, September 24, 2014 at 12:08am

physics
Two objects (53.0 and 16.0 kg) are connected by a massless string that passes over a massless, frictionless pulley. The pulley hangs from the ceiling. Find (a) the acceleration of the objects and (b) the tension in the string.
Tuesday, September 23, 2014 at 11:16pm

physics
A car is towing a boat on a trailer. The driver starts from rest and accelerates to a velocity of +11.4 m/s in a time of 29.2 s. The combined mass of the boat and trailer is 443 kg. The frictional force acting on the trailer can be ignored. What is the tension in the hitch ...
Tuesday, September 23, 2014 at 11:15pm

physics
A toboggan slides down a hill and has a constant velocity. The angle of the hill is 6.70° with respect to the horizontal. What is the coefficient of kinetic friction between the surface of the hill and the toboggan?
Tuesday, September 23, 2014 at 11:14pm

physics
worker stands still on a roof sloped at an angle of 30° above the horizontal. He is prevented from slipping by a static frictional force of 560 N. Find the mass of the worker.
Tuesday, September 23, 2014 at 11:13pm

physics
The longest pass in NFL history is approximately 83.7 m. Ignoring the effects of air resistance, calculate what must have been the initial speed of the football.
Tuesday, September 23, 2014 at 10:49pm

physics
If the earth doubled in mass but stayed the same size, what would be the acceleration due to gravity at the surface? m/s2 The dimensions of the earth as we currently know it are: Mass = 5.98E24 kg, Radius = 6.38E6 m and the universal gravitational constant = 6.67e-11 nm2/kg2
Tuesday, September 23, 2014 at 10:42pm

physics
If a ball hits a wall going 10 m/s, and bounces off going 7 m/s. What is the coefficient of restitution?
Tuesday, September 23, 2014 at 10:34pm

physics
You are riding a carousel that is turning at a constant angular velocity. You must pull toward the center with 100N of force to stay in place. You decide to move radially toward the center of the carousel to ride on a small animal figure that is at half the distance from the ...
Tuesday, September 23, 2014 at 10:32pm

physics
A spring with a spring constant of 53.0 N/m is attached to different masses, and the system is set in motion. What is its period for a mass of 2.7 kg?
Tuesday, September 23, 2014 at 10:10pm

physics
A basketball player throws the ball at a 60° angle above the horizontal to a hoop whose centre is located a horizontal distance L = 8.60 m from the point of release and at a height h = 0.80 m above it. What initial speed is required if the basketball is to reach the centre...
Tuesday, September 23, 2014 at 9:58pm

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 9:43pm

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 9:42pm

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 9:42pm

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 9:41pm

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 9:40pm

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 9:40pm

Physics
How long does it take an automobile traveling 68.5 km/h to become even with a car that is traveling in another lane at 56.5 km/h if the cars’ front bumpers are initially 145 m apart? Answer in units of s.
Tuesday, September 23, 2014 at 9:32pm

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

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