Saturday

March 28, 2015

March 28, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

An object has a volume of 4.0m^3 and weighs 40,000 Newtons. What will be its weight in water?
*Tuesday, January 6, 2015 at 7:59pm*

**Physics**

What is the difference between scalar and vector quantities and what two methods are used to describe vectors? Answer: Scalar quantities measure only distance (speed) while vector quantities measure both distance and direction, ( which is specifically known s displacement?) I ...
*Tuesday, January 6, 2015 at 7:54pm*

**physics**

The small piston of a hydraulic lift has a diameter of 8 cm and its large piston has a diameter of 40cm. The lift raises a load of 15,000 Newtons. A. Determine the force that must be applied to the small piston. B. Determine the pressure applied to the fluid in the lift.
*Tuesday, January 6, 2015 at 7:54pm*

**Physics**

a rectangular box of negligible mass measures 5m long,1m wide and 0.5m high. How many kilograms of mass can be loaded into the box before it will sink in a freshwater lake?
*Tuesday, January 6, 2015 at 7:46pm*

**Physics**

A person weighing 900 Newtons is standing on snowshoes. Each snowshoe has an area of 2500cm^2. What is the pressure on the snow?
*Tuesday, January 6, 2015 at 7:37pm*

**physics**

A rock is given a KE of 2.00*10^4 J when it is launched vertically upward. If the rock reaches a height of 50m determine the mass of the rock.
*Tuesday, January 6, 2015 at 7:09pm*

**physics**

A tugboat pulls a ship with a constant net horizontal force of 5.72 × 103 N and causes the ship to move through a harbor. How much work does the tugboat do on the ship if each moves a distance of 3.11 km ? Answer in units of J.
*Tuesday, January 6, 2015 at 7:07pm*

**physics**

A 18.4 kg block is dragged over a rough, horizontal surface by a constant force of 126 N acting at an angle of 34.1 ◦ above the horizontal. The block is displaced 20 m, and the coefficient of kinetic friction is 0.123. The acceleration of gravity is 9.8 m/s 2 .Find the ...
*Tuesday, January 6, 2015 at 6:52pm*

**Physics**

tarzan, mass 85 kg, swings from a tree on the end of a 20. m vine his feet touch the ground 4.0m below the tree. how fats was he moving when he reaches the ground
*Tuesday, January 6, 2015 at 4:53pm*

**physics **

A race car moving at 157km/hr decelerates at -7.00 m/s^2 to a speed of 75.0km/hr A) how long did this take? B) how many meters did the car travel during this deceleration? I attempted this problem many times and i don't seem to get the correct answer please show all work ...
*Tuesday, January 6, 2015 at 3:49pm*

**physics **

Sally the bug has an initial speed of 20.0cm/s. She then accelerates at 8.00cm/s^2 for 5.00s. calculate sallys total displacement? which i did and got 200 cm Displacement during the 5th second? can you please help and show all work
*Tuesday, January 6, 2015 at 3:47pm*

**physics please help**

A student throws a baseball from the ground to the top of the flag pole. If returns to the ground in 4.00s what it the height of the flagpole? Please show all work need help have a test comine up
*Tuesday, January 6, 2015 at 3:44pm*

**Physics**

A lunar lander in powered descent at 100 m above the surface of the moon slows down from a velocity of 20 m/s to 0.5 m/s at constant acceleration. Assume that the lander has a mass of 20,000 kg and that burning the fuel does not change the mass. Answer the following questions...
*Tuesday, January 6, 2015 at 2:46pm*

**Physics**

A lunar lander in powered descent at 100 m above the surface of the moon slows down from a velocity of 20 m/s to 0.5 m/s at constant acceleration. Assume that the lander has a mass of 20,000 kg and that burning the fuel does not change the mass. Answer the following questions...
*Tuesday, January 6, 2015 at 2:42pm*

**Physics**

At time t = 0, a projectile is launched from ground level. At t = 2.00 s, it is displaced d = 53 m horizontally and h = 54 m vertically above the launch point. What are the (a) horizontal and (b) vertical components of the initial velocity of the projectile? (c) At the instant...
*Tuesday, January 6, 2015 at 11:55am*

**physics**

solve the magnitude of two force such that if any act at right angle resultant is 5kn while the act at angle60 their resultant is square 37
*Tuesday, January 6, 2015 at 1:43am*

**physics**

A 70 kg person is riding on a frictionless skateboard at 5 m/s. A friend facing him throws a 5 kg ball toward him at 20 m/s. What is his final speed after catching the ball?
*Tuesday, January 6, 2015 at 12:10am*

**Physic Worksheets?**

Hi! I have a few tests coming up and I need some practice Physics worksheet/tests. I have already done the worksheets and previous tests, but I still need more practice. Does anyone know a site that I can get some practise problems? Doing a google search only leads to higher ...
*Tuesday, January 6, 2015 at 12:05am*

**Physics**

A high fountain of water is located at the center of a circular pool as shown in the figure below. Not wishing to get his feet wet, a student walks around the pool and measures its circumference to be 18.0 m. Next, the student stands at the edge of the pool and uses a ...
*Monday, January 5, 2015 at 11:44pm*

**Physics**

A fallen tree if lifted 2.75m.What is the work done? W=Fd
*Monday, January 5, 2015 at 11:23pm*

**physics**

What is the distance from the earth's center to a point where your weight would be 1/25 of what you weigh at the surface?
*Monday, January 5, 2015 at 8:44pm*

**Physics**

Consider a ball at rest on the middle of a toy wagon. When a wagon is pulled forward, the ball rolls against the back of the wagon. Interpret this observation in terms of Newton's First Law of Motion. thanks ;)
*Monday, January 5, 2015 at 6:26pm*

**physics**

There are two pit balls equally charged and each with a mass of 1.5g. While one ball is suspended by a thread, the other is brought close to it and state of equilibrium is reached. In that situation,the two balls are seperated by 2.6cm and the thread attached to the suspended ...
*Monday, January 5, 2015 at 11:49am*

**physics**

What are the different physics application in the following sports: 1.baseball: 2.basketball: 3.bowling: 4.cycling: 5.golf: 6.gymnastics: 7.ice hockey 8.swimming Please help me , i really dont have any idea about this. Thank you !! :)
*Monday, January 5, 2015 at 5:35am*

**Physics**

A ball of mass 8 kg falls from rest from a height of 100 m. Neglecting air resistance, calculate its total energy after falling a distance of 40 m.
*Monday, January 5, 2015 at 4:40am*

**Physics**

A 70 kg person is riding on a frictionless skateboard at 5 m/s. A friend facing him throws a 5kg ball toward him at 20 m/s. What is his final speed after catch the ball?
*Monday, January 5, 2015 at 3:12am*

**Physics**

An aluminum measuring tape is correctly calibrated in metric units at exactly 0 degree Celsius. At is used to measure the distance between two lines on a floor, and the reading is 25.000 meters at a temperature of 30.000 degree Celsius. Determine the actual distance between ...
*Monday, January 5, 2015 at 12:47am*

**physics**

the speed of a wave in a 4 m rope is 3.2 m/s. what is the frequency of the vibration required to produce a standing wave pattern with 1 antinode? 2 antinodes? 4 antinodes? please help!!! i don't understand how to do this
*Monday, January 5, 2015 at 12:28am*

**physics**

a pendulum 3m long is displaced at an angle of 40 degrees. What will be the maximum velocity of the pendulum when it is released to oscillate?
*Sunday, January 4, 2015 at 9:57pm*

**physics**

a car rolls down a ramp 4m long that has angle of incline equal to 37 degrees. If the car starts from rest, what will be its velocity at the bottom of the ramp?
*Sunday, January 4, 2015 at 9:55pm*

**physics**

a toy car rolls horizontally on to ramp that has total height of 1.28m. What minimum velocity will aloow the car to reach the top of the ramp?
*Sunday, January 4, 2015 at 9:51pm*

**physics**

what is the power if it takes 11s to drag the sled 80m?
*Sunday, January 4, 2015 at 9:49pm*

**Physics**

how much work is done to drag a 25kg sled 80m?
*Sunday, January 4, 2015 at 9:48pm*

**physics**

The small piston of a hydraulic lift has a cross-sectional area of 3.6 cm2 and the large piston has an area of 86 cm2. What force F must be applied to the small piston to maintain the load of 52 kN at a constant elevation?
*Sunday, January 4, 2015 at 9:47pm*

**Physics**

a 4 kg object is taken to a planet that has 3 times the mass of earth and 1/2 the radius of earth. On this planet the mass of the object will be most nearly.. A. 12kg B. 3kg C. 48kg D. 4kg E. 24 kg
*Sunday, January 4, 2015 at 9:45pm*

**physics**

A 3kg mass is attached to end of a light rod and made to move clockwise in a vertical circle of radius 2m and speed of 6m/s. The tension in the rod at the lowest point is most nearly A. 54N B. 84N C. 30N D. 24N E. 39N
*Sunday, January 4, 2015 at 9:41pm*

**Physics**

A 2kg mass moving at 10m/s slows to speed of 4m/s while sliding across a rough horizontal surface. The work done by friction is most nearly A. 116j B -116J C. 84j D. -84j E. -16j
*Sunday, January 4, 2015 at 9:37pm*

**PHYSICS**

A uniform plank with mass 20kg and length 12m extends 2m over the edge of a building. A 40kg crate is slid out on the plank. how far can the crate be pushed without toppling the plank? A. 0.5m B. 1m C. 1.25m D. 1.5m E. 2m
*Sunday, January 4, 2015 at 9:35pm*

**Physics**

A 3kg mass is sliding across a horizontal surface at a constant speed while being pulled by rope with tension 20N held at a 53 degree angle above the horizontal. The force of friction is most nearly A. 30N B. 12N C. 16N D. 20N E. 1N
*Sunday, January 4, 2015 at 9:30pm*

**physics**

Now how far the will the ball in the problem below will hit the ground? a. 10m b. 6.4m c. 9.6m d. 20m e. 140m a ball rolls off the table top 2m tall. with a velocity of 10m/s. with what speed will it strike the ground? V^2 = Vo^2 + 2g*h V^2=0^2+2*9.8*2 V^2=39.2^2 v=6.3m/s
*Sunday, January 4, 2015 at 9:26pm*

**physics**

explain why carrots look orange?
*Sunday, January 4, 2015 at 7:40pm*

**physics**

explain why carrots look orange
*Sunday, January 4, 2015 at 7:31pm*

**physics**

explain why carrots look orange
*Sunday, January 4, 2015 at 6:30pm*

**Physics **

An optical fiber is made of a clear plastic with index of refraction n=1.6, For what angles with the surface the light remain contained within the plastic guide?
*Sunday, January 4, 2015 at 4:30pm*

**physics**

A bungee jumper of mass 75 kg uses a bungee cord with a relaxedlength of 50 m and jumps from a bridge that is 170 m above the ground. What elastic force constant is necessary for the bungee cord in order for him to jump safely. I have no idea what to do or even start this ...
*Sunday, January 4, 2015 at 4:26pm*

**physics**

A car moves from rest with a constant acceleration of 4m/s squared for 5s .IT then continues with the speed attained for10s and then accelerates at 2m/s squared for 10s.A/ SKETCH A SPEED TIME GRAPH FOR THE WHOLE MOTION GIVING YOUR VALUES ON BOTH AXES.B/CALCULATE THE AVERAGE ...
*Sunday, January 4, 2015 at 1:48pm*

**Physics 11**

A 1.00 x 10^4 W electric motor is used to lift a 955 kg object vertically 25.0 m at a constant velocity in 45.0 s. What is the efficiency of the motor? I did P=W/t (1.00x10^4 x 45 =W) And got 4.50 x 10^5 Then I did Ep' = Ek 955 x 9.81 x 25 = 234213.75 But I wasn't sure...
*Sunday, January 4, 2015 at 3:26am*

**physics**

a ball rolls off the table top 2m tall. with a velocity of 10m/s. with what speed will it strike the ground? A. 10m/s B. 6.3m/s C. 16.3m/s D. 11.8m/s E. 139m/s
*Sunday, January 4, 2015 at 12:35am*

**physics**

An acceptable unit for power would be A. kg-m/s B. kg-m-m/s/s/s C. N/s D. Kg-m-m/s/s E. J-s
*Sunday, January 4, 2015 at 12:32am*

**physics**

a wooden block of mass equal to 15kg is pressed against a spring. The spring has constant of 225N/m. If the spring is compressed 0.15m, how fast will the block travel when released?
*Sunday, January 4, 2015 at 12:15am*

**physics**

a toy car rolls horizontally on to a ramp that has a total height of 0.8m. what minimum velocity will allow the car to reach the top of the ramp/
*Saturday, January 3, 2015 at 8:05pm*

**Physics, Math, Aerospace, Engineering**

A de-orbit burn, similar (but not the same) to that presented in the previous math problem, has been performed. During this de-orbit burn a pre-calculated ∆V (delta V, change in velocity) of 99.1 meters per second will be used to decrease the Shuttle’s altitude from...
*Saturday, January 3, 2015 at 7:22pm*

**physics**

A 0.5 kg rock is projected from the edge of the top of a building with an initial velocity of 9.66 m/s at an angle of 41 degrees. The building is 10.1 m in height. At what horizontal distance, x, from the base of the building will the rock strike the ground? Assume the ground ...
*Saturday, January 3, 2015 at 4:49pm*

**Physics**

How much force is required to accelerate a 1500kg car to a speed of 17m/s in a distance of 45m? Thank you.
*Saturday, January 3, 2015 at 7:28am*

**Physics**

A mass of 25kg is acted on by a force of 56N. If a friction force of 12N exists, find the acceleration of the mass. I have worked the following: a=F/M = 44/25 = 1.76 m/s2 Am I correct? Thank you.
*Saturday, January 3, 2015 at 7:14am*

**physics**

Three vectors are specified as A is 5 m at 45o north of east, B is 7 m at 60o east of south, and C is 4 m at 30o west to south. Find the magnitude and direction of their sum.
*Saturday, January 3, 2015 at 6:11am*

**physics**

A man walks 5 m at 37 degree north of east then 10 m at 60 degree west of north.? calculate the magnitude and direction of his displacement.
*Saturday, January 3, 2015 at 6:10am*

**physics**

a car is traveling 25 ns^-1 around a level curve of radius 120 m. what is the minimum value of the coefficient of static friction µs between the tires and the road to prevent the car from skidding
*Saturday, January 3, 2015 at 5:44am*

**physics**

An object is thrown up from the top of building 50 m high. it rises to a maximum height of 20 m above the roof.? a) when does it land on the ground b) at what velocity does it land? c) what is its velocity 15m below the roof?
*Saturday, January 3, 2015 at 4:43am*

**physics**

Determine the x and y components of the following vectors? a) P of length 5 m directed at 150 degree counter clockwise from the positive x axis b) Q of length 3.6 m directed at 120 degree clockwise from the positive y axis
*Saturday, January 3, 2015 at 4:22am*

**physics**

a ship sails from a point at a distance of 4 km and a bearing of 40 degree noth of east relative to a lighthouse to a point 6 km from the lighthouse at 60 degree north to west. calculate a) the displacement b)the least distance between them
*Saturday, January 3, 2015 at 4:13am*

**physics**

Three vectors are specified as A is 5 m at 45o north of east, B is 7 m at 60o east of south, and C is 4 m at 30o west to south.?Find the magnitude and direction of their sum.
*Saturday, January 3, 2015 at 4:11am*

**physics**

A man walks 5 m at 37 degree north of east then 10 m at 60 degree west of north.? calculate the magnitude and direction of his displacement.
*Saturday, January 3, 2015 at 4:01am*

**Physics**

You are going diving in a pool of fresh water. Your body can only take a total pressure on it of 2.0 atmospheres. How deep can you dive before your body can no longer take the pressure?
*Friday, January 2, 2015 at 8:31pm*

**physics**

A toy boat has a volume of 0.0005m^3. It has a mass of 450 grams. How much of the boat is under fresh water?
*Friday, January 2, 2015 at 6:44pm*

**Physics**

A hot air balloon of radius 12 meters has been heated so that the air inside has a density of 1.05 kg/m^3. What can the total load of the balloon be (mass of balloon itself plus cargo) if you need the balloon to accelerate into the air with an acceleration of 4 m/s^2?
*Friday, January 2, 2015 at 6:16pm*

**Physics**

A place kicker must kick a football from a point 33.0 m (about 36 yd) from the goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 20.0 m/s at an angle of 48◦ to the horizontal. To...
*Friday, January 2, 2015 at 3:51pm*

**physics**

Explain why a minibus is more likely to topple over when the roof rack is heavily loaded than when the roof rack is empty.
*Friday, January 2, 2015 at 3:36pm*

**physics**

A ball is thrown horizontally from the top of a building 43.4 m high. The ball strikes the ground at a point 57.3 m from the base of the building. The acceleration of gravity is 9.8 m/s^2. a. Find the time the ball is in motion. Answer in units of s. b. Find the initial ...
*Friday, January 2, 2015 at 2:09pm*

**physics**

An insect walks 50 cm in a straight line along a wall. if its horizontal displacement is 25 cm,? calculate its vertical displacement.
*Friday, January 2, 2015 at 11:15am*

**physics**

a baseball is thrown at 30ms^-1. the batter hits it and gives it a velcoity of 40ms^-1 in the opposite direction. if the ball and bat are in contact for 0.04 s, what is the average acceleration of the ball during this interval?
*Friday, January 2, 2015 at 10:46am*

**Physics 1**

a piece of stone was dropped from the top of the building. the stone took 10 s to hit the ground. what is the veocity of the stone just before it hit the ground?
*Thursday, January 1, 2015 at 11:11pm*

**Physics**

A force of 270N acts on a mass of 13.5kg for 13sec. Calculate a) the acceleration b) the final velocity c) the distance covered. a)F=m*a, so 270=13.5*a/13, answer 260m/s b)Not sure which formula. c)Formula d=v*t, once velocity is worked out in question b). I am not sure with a...
*Thursday, January 1, 2015 at 10:21pm*

**physics**

A golfer takes two putts to get his ball into the hole once he is on the green. The ﬁrst putt displaces the ball 3.4 m east, and the second 6.55 m south. What displacement would have been needed to get the ball into the hole on the first putt. answer in units of m
*Thursday, January 1, 2015 at 8:26pm*

**Physics**

A 6kg mass is acted on by a force for 60sec and acquires a speed of 10m/s. What is the value of the force? I have calculated this as below: F = ma Therefore F = 6*10/60 F=1N Am I on the correct path? Thank you kindly
*Thursday, January 1, 2015 at 5:28pm*

**Physics**

A block and tackle with a velocity ratio of 5 is used to raise a mass of 25kg through a vertical distances of 40cm at a steady rate.if the effort is equal to 60N,determine.(a)The distance moved by the effort.(b)The workdone by the effort in lifting the load.(c)The loss in ...
*Thursday, January 1, 2015 at 10:54am*

**Physics**

What force is required to give a 1kg body a velocity of 5m/s after acting for 5sec? I know I can use F=mxa What do I do with the 5sec? Thanks
*Thursday, January 1, 2015 at 7:33am*

**physics**

A stone is thrown into water pond forming 10 waves in 5 seconds. The diameter of the first crest is 13 m and the diameter of the last crest is 4m. Find a.the periodic time b.the frequency c.the wave length d.the wave velocity
*Thursday, January 1, 2015 at 5:58am*

**physics**

A ball strikes against the floor and returns with double velocity.In which type of collision is it possible?
*Thursday, January 1, 2015 at 3:24am*

**physics**

A car moves at a constant speed of 60 km/hr for 1 km and 40 km/hr for next 1 km. What is the average speed of the car ?
*Thursday, January 1, 2015 at 3:09am*

**physics**

to view full image of an object 160 cm high, the minimum size of the plane mirror required is?
*Wednesday, December 31, 2014 at 7:34pm*

**Physics**

1) On the construction site an electric crane is used to lift materials to the 10th floor. A 180 kW motor requires 2.0 minutes to lift a 10500 kg load if bricks 218 m. How efficient is the crane? 2. Burning 1.0 kg of coal releases 33 MJ of energy. This energy is converted into...
*Wednesday, December 31, 2014 at 4:08pm*

**physics**

10. A 2-kg object is moving at 3m/s. A 4-N force is applied in the direction of motion and then removed after the object has traveled an additional 5m. The work done by this force is: A. 12 J B. 15 J C. 18 J D. 20 J E. 38 J ans: D 11. A sledge (including load) weighs 5000 N. ...
*Wednesday, December 31, 2014 at 2:09pm*

**Physics**

Starting from Newton’s law of universal gravitation, show how to find the speed of the moon in its orbit from the earth-moon distance of 3.9 × 108 m and the earth’s mass. Assume the orbit is a circle. So I calculated this and got 1.0 km/s, I was just wondering ...
*Wednesday, December 31, 2014 at 1:49pm*

**Physics**

What is the orbital velocity of the Earth around the Sun, assuming the Earth takes a perfectly circular orbit around the Sun? What would be the centripetal acceleration of the Earth around the Sun? (I have no clue :() From my textbook I found out that Earth has a mass of 5....
*Wednesday, December 31, 2014 at 1:09pm*

**physics**

a battery has an e.m.f of 6 volts and an internal resistance of 0.4 ohm.it is connected to a 2.6 ohm resistor through a SPST{single pole,single throw}switch.when the switch is closed,the potential difference between the terminals of the battery is,involts?
*Wednesday, December 31, 2014 at 7:15am*

**physics**

two forces of the same magnitude act at a point.the square of their resultant is 3 times the product of their magnitudes.the angle between them is?
*Wednesday, December 31, 2014 at 7:10am*

**physics**

2.4 ampere current is flowing in a wire .how many electrons pass a given point in the wire in one second if the charge on an electron is 1.6x10 power -19 couloms.
*Wednesday, December 31, 2014 at 7:07am*

**physics**

a toroid has 3000 turns. the inner and outer diameter are 22 cm and 26 cm. what is the flux density inside the core when there is a current of 5 amperes?
*Wednesday, December 31, 2014 at 7:02am*

**physics**

the resistance of a platinum resistance thermometer is 200.0 ohm at o degree centigrade and 257.6 ohm when immersed in hot bath,what is the temperature of the bath when 'alpha' for platinum is 0.00392degree centigrade inverse.
*Wednesday, December 31, 2014 at 6:57am*

**physics**

A locomotive is running at a constant speed of 100 km/ h. The diameter of driving wheels is 1.8 m. The stroke of the piston of the steam engine cylinder of the locomotive is 600 mm. Find the centripetal acceleration of the crank pin relative to the engine frame.
*Wednesday, December 31, 2014 at 5:52am*

**physics**

A flywheel is making 180 r.p.m. and after 20 seconds it is running at 140 r.p.m. How many revolutions will it make, and what time will elapse before it stops, if the retardation is uniform ?
*Wednesday, December 31, 2014 at 5:48am*

**physics**

what will be the centipetal acceleration on a man whose mass is 80 kg,when resting on a ground at the equator if the radius of the earth'R' is 6.4x10 power 6 meter.
*Wednesday, December 31, 2014 at 5:39am*

**physics**

the speed of an object at the end of 4 successive seconds is 20,25,30 and 35 meters per second,respectively.the acceleration of this object is?
*Wednesday, December 31, 2014 at 5:35am*

**physics**

a ball of weight 200 grams,is tied to the end of a cord and whirled in a horizontal circle of radius 0.6 m.if the ball makes five complete revolutions in 2 seconds,what will be the linear speed of the ball?
*Wednesday, December 31, 2014 at 5:32am*

**physics**

A cage descends a mine shaft with an acceleration of 0.5 m/s2. After the cage has travelled 25 metres, a stone is dropped from the top of the shaft. Determine : 1. the time taken by the stone to hit the cage, and 2. distance travelled by the cage before impact.
*Wednesday, December 31, 2014 at 5:30am*

**physics**

What is the mass if an elephant that has 45,000 J when it is moving 5.0 m/s
*Tuesday, December 30, 2014 at 8:28pm*

**Physics**

Initially sliding with a speed of 2.5 m/s, a 2.0 kg block collides with a spring and compresses it 0.35 m before coming to rest. What is the force constant of the spring?
*Tuesday, December 30, 2014 at 1:41pm*

**physics**

How much thrust is required to launch a 5 kg bottle rocket with an upward acceleration of 6.4 m/s2? I've gotten 32 because F=MA but I don't understand how to account for gravity. Please help!
*Tuesday, December 30, 2014 at 1:30pm*

**physics**

a rock is dropped from a high brige.at the end of 3 seconds of free fall the speed of the rock is:[in centimeters per second,g=10 m/second square]
*Tuesday, December 30, 2014 at 11:01am*

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