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October 1, 2014

Search: A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 0.9 s. Find the time it takes for the ball to fall from rest all the way to the ground

Number of results: 40,513

physics
A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway is 1.6 seconds. Find the time it takes for the ball to fall from rest all the way to the ground.
September 16, 2008 by nj

physics
A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fail halfway to the ground is 1.2s. Find the time it takes for the ball to fall from rest all the way to the ground. Can anyone give me some hints to do this? ...
October 6, 2007 by ajo

physics
A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 4.36 s. Find the time it takes for the ball to fall from rest all the way to the ground.
February 7, 2011 by shaknocka

physics
A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 1.4 s. Find the time it takes for the ball to fall from rest all the way to the ground.
October 3, 2011 by Anonymous

physics
A 6840 N wrecking ball hangs from the end of a steel cable. What is the net force acting on the wrecking ball if the cable snaps? equation please and explain
October 13, 2010 by Bansnoob

Physics
A 1200 wrecking ball hangs from a 20 -long cable. The ball is pulled back until the cable makes an angle of 30.0 with the vertical.By how much has the gravitational potential energy of the ball changed?
April 16, 2011 by Mike aloe

physics
A 1100 wrecking ball hangs from a 10 -long cable. The ball is pulled back until the cable makes an angle of 28.0 with the vertical.By how much has the gravitational potential energy of the ball changed?
January 28, 2013 by Mak

physics
a 1100 kg wrecking ball hangs from a16m long cable. the ball is pulled back until the cable makes an angle of 17 with the vertical. By how much has the gravitational potential energy of the ball changed?
November 26, 2012 by kelly

Pre-Calc
A wrecking ball attached to a crane swings back and forth. The distance that the ball moves to the left and right of its resting position with respect to time is represented by the following graph.
November 15, 2013 by lisa

college physics
A 1100 kg wrecking ball hangs from a 14m-long cable. The ball is pulled back until the cable makes an angle of 17.0 degrees with the vertical.By how much has the gravitational potential energy of the ball changed?
June 22, 2011 by Bethany

college physics
A 1500 wrecking ball hangs from a 16 -long cable. The ball is pulled back until the cable makes an angle of 23.0 with the vertical.
February 16, 2012 by stew

Physics
A crane with a movable pulley system on a horizontal arm is moving a large container. The 355 kg container is hanging from a cable that is 6.15 m out on the 7.50 m arm. The arm has a mass of 345 kg. A cable that is attached to its end makes and angle 32.0 degrees with the ...
April 7, 2013 by Bella

physics
A 25 ft long crane supported at its lower end by a pin is elevated by a horizontal cable. A 250 lb load is suspended from the outer end of the crane. The center of gravity of the crane is 10 ft from the pin and the crane weighs 200 lb. What is the tension in the horizontal ...
December 3, 2009 by sandhya

Physics
A 1,500 kg crate hangs motionless from a crane cable. What is the tension in the cable? Ignore the mass of the cable. Suppose the crane accelerates the crate upward at 1.2 m/s2. What is the tension in the cable now?
October 5, 2010 by Anonymous

Science
A crate of mass 2000 kg is hanging from a crane at the end of a cable 12 m long. If we attach a horizontal rope to this crate and gradually apply a pull of 1800 N, what angle will the cable finally make with the vertical?
September 29, 2011 by May

physics
A wrecking ball (weight 4140 N) is supported by a boom, which may be assumed to be uniform and has a weight of 2550 N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is 32 degrees, and ...
June 9, 2007 by annie

Physics
An electric motor is used to pull a 125 kg box across a floor using a long cable. the tension in the cable is 350N and the box accelerates at 1.2m/s^2[forward] for 5.0s. The cable breaks and the box slows down and stops. b) How far does the box travel up to the moment the ...
October 11, 2011 by Ivo

Physics
an electric motor is used to pull a 125 kg box across a floor using a long cable. the tension in the cable is 350 N amd the box accelerates at 1.2 m/s^2 [forward] for 5 seconds. the cable breaks and the box slows down and stops. calculate the coefficient of kinetic friction? ...
October 9, 2011 by marr

Physics
A crane is holding a bloc of metal of 10 000kg. If the crane's arm weights 1000kg and is 10,0m long, what is the tension in cable a and how big is the force exerted on the pivot of the cranes arm. the cable passes through the top of the cranes arm and then is vertical whilst ...
February 20, 2012 by Raf

Physics
A crane is holding a bloc of metal of 10 000kg. If the crane's arm weights 1000kg and is 10,0m long, what is the tension in cable a and how big is the force exerted on the pivot of the cranes arm. the cable passes through the top of the cranes arm and then is vertical whilst ...
February 21, 2012 by Raf

Physics(2)
A crane is holding a bloc of metal of 10 000kg. If the crane's arm weights 1000kg and is 10,0m long, what is the tension in cable a and how big is the force exerted on the pivot of the cranes arm. the cable passes through the top of the cranes arm and then is vertical whilst ...
February 22, 2012 by Raf

Physics
An electric motor is used to pull a 125 kg box across a floor using a long cable. the tension in the cable is 350N and the box accelerates at 1.2m/s^2[forward] for 5.0s. The cable breaks and the box slows down and stops. How far does the box travel from the moment the cable ...
October 29, 2012 by Lala

Physics
An electric motor is used to pull a 125 kg box across a floor using a long cable. the tension in the cable is 350N and the box accelerates at 1.2m/s^2[forward] for 5.0s. The cable breaks and the box slows down and stops. How far does the box travel from the moment the cable ...
October 29, 2012 by Lala

physics
A heavy piece of equipment(85kg) is being moved by elevator between floors in a building. Two identical small cranes are used. A cable connecting each crane to a mounting hook on the top of the piece of equipment.The cable from one crane is at an angle of 22 degree below the ...
September 5, 2012 by Emily

Phsyics
In a shipping yard, a crane operator attaches a cable to a 1130-kg shipping container and then uses the crane to lift the container vertically at a constant velocity for a distance of 30 m. Determine the amount of work done by each of the following. (a) the tension in the ...
March 26, 2014 by ANdy

trigo
a crane at the edge of a dock is supported by a cable 15 meters long, attached to the dock 9 meters long from the base of the crane. if the crane is 6 meters long, what is the acute angle that the crane arm forms with the horizontal?
August 14, 2014 by layton

physics
A wrecking ball (weight = 4880 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3520 N. As the drawing below shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is θ1...
November 17, 2013 by ERsa

Physics
A crane is lifting a 500kg payload straight up at a constant speed of 0.7ms-1. (a)What is the power output of the crane. (ignoring losses)? (b)If it takes the cran2 2 minutes to raise the payload to its final height, how far above the ground is this? (c)If the cable were to ...
September 21, 2012 by Ellie

Physics
An 1567 kg car, being lifted at a steady speed by a crane, hangs at the end of a cable whos radius is .0084. The cable is 5m in length and stretches by .0081 becuase of the weight of the car. What is young's modulus for the cable?
March 31, 2008 by Erich

physics, torque
A crane shown in the drawing is lifting a 170-kg crate upward with an acceleration of 1.8 m/s2. The cable from the crate passes over a solid cylindrical pulley at the top of the boom. The pulley has a mass of 130 kg. The cable is then wound onto a hollow cylindrical drum that ...
June 4, 2007 by Marigold

Physics
A sign is supported by a cable and a horizontal beam.The beam has a length 1.4 m and a uniform mass of12 kg.a) If the cable is attached to the beam at a distance of 1.0 m from the hinge, what is the tension in the cable? (b) If the cable breaks, what is the net torque on the ...
October 24, 2009 by Sandhu

Physics, please help
Hello, I don't know how about to answering this question: work out the problem of a ball of mass m that falls a distance h from rest. It hits the floor and rebounds to its starting height. (a) What total time ie required for the motion? (Neglect the time of contact with the ...
October 31, 2006 by amber

physics
A mass m1 = 10 kg on top of a rough horizontal table surface is connected by a massless cable over a frictionless wheel to a hanging mass m2 = 5 kg, as shown in the previous problem. In m2 falls 1 m from rest in 1.2 seconds, find the co-efficient of kinetic friction between m1...
October 8, 2012 by kim

Physics: Buoyancy
A crane lifts the 23000 kg steel hull of a ship out of the water. Determine the following. (a) the tension in the crane's cable when the hull is submerged in the water
January 27, 2013 by Seth

Physics: Buoyancy
A crane lifts the 23000 kg steel hull of a ship out of the water. Determine the following. (a) the tension in the crane's cable when the hull is submerged in the water
January 27, 2013 by Seth

Physics
After an unfortunate accident at a local warehouse you have been contracted to determine the cause. A jib crane collapsed and injured a worker. The horizontal steel beam had a mass of 88.50 kg per meter of length and the tension in the cable was T = 11.78 kN. The crane was ...
November 15, 2011 by Morgan

Physics Classical Mechanics
A crane is configured as below, with the beam suspended at two points l1 and l2 by each end of a cable passing over a frictionless pulley. The two ends of the cable each make an angle θ with the beam. A counterbalance object C with mass mC is fixed at one end of the beam...
November 26, 2013 by A

Math
Two cranes can unload a ship together in 15 hours. The faster crane takes 16 hours less than the slower crane, if each were to unload the same ship alone. How long does it take for each crane to unload a ship
May 21, 2012 by Jasmine

Physics
An electrical cable is atteched to the electrical pole 25m apart. The cable weighs 2.5N/m and can resist a pull of 300N . assuming that the cable takes a parabolic shape, detrmine the smallest value of sag in the cable
April 1, 2013 by Nirpendra

physics
A strip of rubber originally 75 mm long is stretched until it is 100 mm long. a.What is the tensile strain b.Why has the answer no units? c.The greatest tensile stress which steel of a particular sort of a particular sort can withstand without breaking is about 10>9 N m>...
December 27, 2013 by farid

Physics
It takes 2.5 s for a small ball released from rest from a tall building to reach the ground. The mass of the ball is 0.05 kg. Calculate the height from which the ball is released. Ok so I have the time, initial velocity, and the acceleration. But the mass totally throws me off...
October 9, 2007 by Lindsay

physics
A ball starts at the origin from rest rolling down a hill. It takes seven seconds for the ball to reach point ďAĒ, which is 25 meters from the origin. At point ďBĒ, the ballís velocity is 15 m/s. You may assume constant acceleration. a. What is the acceleration of the ball? [2...
September 24, 2013 by Sue

physics
an electric motor is used to pull a 125 kg box across a floor using a long cable. the tension in the cable is 350 N amd the box accelerates at 1.2 m/s^2 [forward] for 5 seconds. the cable breaks and the box slows down and stops. calculate the coefficient of kinetic friction?
October 9, 2011 by marr

physics
a 10kg wood ball hangs from a 1.1 m long wire. The maximum tension the wire can withstand without breaking is 600N. a .9 kg projectile traveling horizontally hits and embeds itself in the wood ball. What is the largest speed the the projectile can have before the cable breaks
October 2, 2011 by Sandra

physics
You stand at the top of a cliff while your friend stands on the ground below you. You drop a ball from rest and see that it takes 0.90 for the ball to hit the ground below. Your friend then picks up the ball and throws it up to you, such that it just comes to rest in your hand...
January 30, 2011 by SAM

PHYSICS!!
A ball on the end of a string is whirled around in a horizontal circle of radius 0.386 m. The plane of the circle is 1.10 m above the ground. The string breaks and the ball lands 2.00 m (horizontally) away from the point on the ground directly beneath the ball's location when ...
November 1, 2008 by mike

Physics
A ball is released from rest 5.1 metre above a 26.0 metre tank of water. In the water the ball experiences a bouyant force of 53 N and takes 4.70 seconds from the time it is released to reach the bottom of the tank. What is the mass of the ball?
November 12, 2012 by Montana

physics
A 2940 kg demolition ball swings at the end of a 16.9 m cable on the arc of a vertical circle. At the lowest point of the swing, the ball is moving at a speed of 8.28 m/s. Determine the tension in the cable.
February 24, 2011 by thaokieu

physcis
A 2520 kg demolition ball swings at the end of a 23.9 m cable on the arc of a vertical circle. At the lowest point of the swing, the ball is moving at a speed of 8.97 m/s. Determine the tension in the cable.
February 19, 2012 by KayLyn

physics
A 2490 kg demolition ball swings at the end of a 35.9 m cable on the arc of a vertical circle. At the lowest point of the swing, the ball is moving at a speed of 7.26 m/s. Determine the tension in the cable.
February 19, 2012 by Shelby

Physics
A ball on the end of a string is whirled around in a horizontal circle of radius 0.486 m. The plane of the circle is 1.83 m above the ground. The string breaks and the ball lands 2.39 m away from the point on the ground directly beneath the ballís location when the string ...
January 28, 2013 by Emily

Physics
A ball on the end of a string is whirled around in a horizontal circle of radius 0.486 m. The plane of the circle is 1.83 m above the ground. The string breaks and the ball lands 2.39 m away from the point on the ground directly beneath the ballís location when the string ...
January 28, 2013 by Allisa

Physics
A ball on the end of a string is whirled around in a horizontal circle of radius 0.33 m. The plane of the circle is 1.21 m above the ground. The string breaks and the ball lands 2.22 m away from the point on the ground directly beneath the ballís location when the string ...
March 12, 2013 by Mike Undi

Science
WHen a wrecking ball hits a wall, it is usually moving at about 10 km/h, which is not very fast. How can this ball knock down a solid wall?
January 19, 2012 by Micheal

Algebra 1 Answer Evaluation
The height of a soccer ball kicked from the ground can be approximated by the function h = =16t^2 + 64t, where he is the height in feet and t is the time in seconds. Find the time it takes for the ball to return to the ground. A: It takes the ball 2 seconds to return to the ...
May 13, 2014 by Victoria

Physics
A ball is sitting in a child's wagon and a child is holding the wagon's handle. The ball then rolls to the back of the wagon without anyone touching the ball directly. Which of the following statements according to Newton's first law of motion could describe the motion of the ...
June 8, 2014 by Sam

Physics(Please respond)
1) A 1320 kg demolition ball swings at the end of a 34.3 m cable on the arc of a vertical circle. At the lowest point of the swing, the ball is moving at a speed of 3.32 m/s. Determine the tension in the cable. F=ma (34.3)(3.32) = 113.87 Ia this correct?
May 29, 2012 by Hannah

Physics
A 1.4 kg ball is thrown upwards off the side of a building with a spped of 5.8 m/s and falls into an ocean 16 meters below. Once the ball hits the water it travels a depth of 1.4m then floats to the surface. Assuming the acceleration of the ball when it hits the water is ...
August 29, 2010 by Kaye

physics
The single cable supporting an unoccupied elevator breaks when the elevator is at rest at the top of a 155 m high building. With what speed does the elevator hit the ground?
December 4, 2010 by Brittany

Science
A ball is thrown vertically into the air and takes 5s to return to the thrower, from time of projection. What is the time it takes to reach maximum height ?
January 31, 2011 by Christopher

Engineering Science
A ball is thrown vertically into the air and takes 5s to return to the thrower, from time of projection. What is the time it takes to reach maximum height ?
January 31, 2011 by Christopher

physics
A ball on the end of a string is whirled around in a horizontal circle of radius 0.22 m. The plane of the circle is 1.69 m above the ground. The string breaks and the ball lands 2.68 m away from the point on the ground directly beneath the ballís location when the string ...
September 9, 2011 by squires

physics
Q. A 200 kg load is suspended by a cable from a crane . Two ropes are attached to the load , acting at 90 deg to each other. One rope exerts a pull of 220 N , at 10 deg below horizontal, the other rope exerts a force of 360 N at 15 deg below horizontal. Calculate 1)tension in ...
February 7, 2014 by john

Physics
a driver of a car going 95.0km/h suddenly sees the lights of a barrier 35.0 m aheadd. It takes the driver 95 s before he applies the breaks, and the average acceleraion during breaking is -10.om/s/s does the car hit the barrier?
March 16, 2011 by Jerry

physics
A ball bearing is dropped from rest at a point A. At the instant it passes a mark 4.5 m below A, another ball bearing is released from rest from a position 5.5 m below A. 1) At what time after its release will the second ball bearing be overtaken by the first? 2) How far does ...
June 7, 2011 by tank

Phsyicssss PLease helppp ASAP
A helicopter is lifting two crates simultaneously. One crate with a mass of 151 kg is attached to the helicopter by cable A. The second crate with a mass of 79 kg is hanging below the first crate and attached to the first crate by cable B. As the helicopter accelerates upward ...
February 12, 2012 by Anonymous

Physicsss helppp pleaseee
A helicopter is lifting two crates simultaneously. One crate with a mass of 151 kg is attached to the helicopter by cable A. The second crate with a mass of 79 kg is hanging below the first crate and attached to the first crate by cable B. As the helicopter accelerates upward ...
February 12, 2012 by Anonymous

Physicssss please help
A helicopter is lifting two crates simultaneously. One crate with a mass of 151 kg is attached to the helicopter by cable A. The second crate with a mass of 79 kg is hanging below the first crate and attached to the first crate by cable B. As the helicopter accelerates upward ...
February 12, 2012 by Anonymous

PHYSICS
The boom crane in the diagram is in static equilibrium and weighs 2000 N with its center of gravity in the middle of its length. It is supported by a frictionless pivot at the left end and a cable connected to the center of the boom and is supporting a load of 5000N at the ...
December 11, 2006 by JENNY

physics
1.In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.56 x 10*-17 N during the first 1.87 cm of tube's length; then they move at essentially constant velocity another 45.0 cm before hitting the screen. Find the speed of the ...
September 24, 2008 by Sandhya

momentun
A small steel ball B is at rest on the edge of a table of height h=1m. Another steel ball A, used as the bob of a simple pendulum also of length h=1m, is released from rest with the pendulum suspension horizontal, and swings against B as shown in the diagram.The masses of the ...
April 22, 2013 by Anonymous

physics
determine the tension in each cable below. draw a force diagram for the system before solving the problem. Case A- ball suspended on one cable Case B- ball suspended on by two cables
October 11, 2012 by Madison

Honors Physics
A mass, m1 = 5.00 kg, resting on a frictionless horizontal table is connected to a cable that passes over a pulley and then is fastened to a hanging mass, m2 = 9.0 kg. Find the acceleration of each mass and the tension in the cable. PLEASE HELP!
September 21, 2010 by Chubba

college physics
a 1.0 N-weight is hanging at rest as shown. In each case, write in the magnitude of the unknown force. a) chain with a weight of 2.5 N has a 1.0 N hanging weight b) chain with a weight of .5 N has a 1.0 N hanging weight c) stretched elastic band with negligible weight has a 1....
March 8, 2012 by Amber

Physics
a 1.0 N-weight is hanging at rest as shown. In each case, write in the magnitude of the unknown force. a) chain with a weight of 2.5 N has a 1.0 N hanging weight b) chain with a weight of .5 N has a 1.0 N hanging weight c) stretched elastic band with negligible weight has a 1....
March 11, 2012 by Brandon

Physics
A crane lifts the 22000kg steel hull of a ship out of the water. Determine the tension in the crane's cable when the hull is submerged in the water. Determine the tension when the hull is completely out of the water.
November 3, 2012 by Sarah

algebra 1 NEED NOW!!! PLEASE HELPPP
The height of a soccer ball that is kicked from the ground can be approximated by the function: y = -12⋅x2 + 48⋅x where y is the height of the soccer ball in feet x seconds after it is kicked. Find the time it takes the soccer ball to reach its maximum height: ...
July 1, 2013 by lisa

algebra 1 NEED NOW!!! PLEASE HELPPP
The height of a soccer ball that is kicked from the ground can be approximated by the function: y = -12⋅x^2 + 48⋅x where y is the height of the soccer ball in feet x seconds after it is kicked. Find the time it takes the soccer ball to reach its maximum height: ...
July 1, 2013 by lisa

Physics.. please help!!!!!
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 kickerís foot is 16 m/s at angle of 46◦ above the horizontal. The top of the fence is 4 m high. The ball hits ...
October 20, 2011 by Elle

Physics ~IMPULSE~
a) A tennis racket a 450 N force on a 0.05 kg tennis ball over a 0.006 s time period. What is the impulse applied to the ball? b) A ball (0.5 kg) is thrown with a velocity of 15 m/s. A receiver catches the ball and brings it to rest is 0.02 s. a) What is the change in momentum...
February 16, 2013 by Isis

Algebra 1
The height in feet of a baseball after it is hit can be modeled by the function f(x) =-16x^2 + 100x, where x is the time in seconds after the ball is hit. Find the ball's maximum height and the time it takes the ball to reach this height. Then find how long the ball is in the ...
April 17, 2014 by Victoria

Cranes
08/09/2005 Physics A crane is lifting a 200 pound object. The crane boom is 50 ft long. The boom forms an 85 degree angle with the horizontal. What is the torque applied to the crane boom?
October 23, 2011 by Jerry

physics
A ball is thrown horizontally at 10.0 m/s from the top of a hill 50.0 m high. How far from the base of the hill would the ball hit the ground? I don't understand the following explained by Quittich (sp)? "Since there is no vertical component, the time to hit the ground is the ...
April 2, 2008 by Jon

physics
A 5.6-kg bowling ball is accelerated from rest to a velocity of 17 m/s as the bowler covers 5.0 m of approach before releasing the ball. What force is exerted on the ball during this time?
November 1, 2011 by Eddie

physics
An object with mass m1=5.00 kg rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2= 10.0 kg. Find the acceleration of each object and the tension in the cable.
September 26, 2011 by Dee

physics
An object with mass m1=5.00 kg rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2= 10.0 kg. Find the acceleration of each object and the tension in the cable.
September 26, 2011 by Dee

physics
a crane drops a .3 kg steel ball onto a steel plate. the ball's speeds just before impact and after are 4.5 m/s and 4.2 m/s respectively. If the ball is in contact with the plate for .03 s, what is the magnitude of the average force that the ball exerts on the plate during ...
December 4, 2008 by jason

science
what must the crane work against in order to lift the box upward? . wind . friction . gravity . cable tension
February 6, 2013 by ninel

Physics
The arm of a crane at a construction site is 13.1 m long, and it makes an angle of 20į with the horizontal. Assume that the maximum load the crane can handle is limited by the amount of torque the load produces at the base of the arm. (a) What is the magnitude of the maximum ...
March 21, 2011 by Krista

physic
An object with mass m1 = 5.00 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2 = 10.0 kg, as shown in the figure below. Find the acceleration of each object and the tension ...
October 15, 2009 by Chan

physic
An object with mass m1 = 5.00 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2 = 10.0 kg, as shown in the figure below. Find the acceleration of each object and the tension ...
October 16, 2009 by Chan

Physics
An object with mass m1 = 6.00 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2 = 8.0 kg, as shown in the figure below. Find the acceleration of each object and the tension ...
October 20, 2010 by Diana

algebra
a ball is thrown straight up into the air with an initial velocity of 128 ft/sec, the total amount of time in seconds that it takes the object to return to the earth can be calculated by using the quadratic, 128t-16t^2=0. Determine the "flight time," t, of the ball.
December 12, 2011 by Shelly

physics
Consider a ball of mass m1 moving with a velocity u1 collides elastically with a ball of mass m2 at rest.Show that the maximum energy transfer takes place when m1=m2.
September 2, 2011 by Nantu

momentum/impulse
The following data concerns a tennis ball at a given instant before it is struck by a tennis racket; horizontal momentum of tennis ball= 2.4Ns kinetic energy of ball= 45J a) why is correct to give the direction of the momentum but not the kinetic energy b) write down in terms ...
October 15, 2006 by Kim

Calculus
An electric elevator cable with a motor at the top has a multistrand cable weighing 4.5lb/ft. When the car is at the first floor, 180ft of cable are pulled out, and effectively 0ft are out when the car is at the top floor. How much work does the motor do just lifting the cable...
May 2, 2014 by Mason

physics
just a couple more questions 1.) The power needed to accelerate a projectile from rest to is launch speed v in a time t is 43.0 W. How much power is needed to accelerate the same projectile from rest to launch speed of 2v in a time of 1/2t? 2.)A ball is fixed to the end of a ...
October 20, 2010 by jo

physics
just a couple more questions 1.) The power needed to accelerate a projectile from rest to is launch speed v in a time t is 43.0 W. How much power is needed to accelerate the same projectile from rest to launch speed of 2v in a time of 1/2t? 2.)A ball is fixed to the end of a ...
October 20, 2010 by jo

physics
just a couple more questions 1.) The power needed to accelerate a projectile from rest to is launch speed v in a time t is 43.0 W. How much power is needed to accelerate the same projectile from rest to launch speed of 2v in a time of 1/2t? 2.)A ball is fixed to the end of a ...
October 21, 2010 by jo

physics
a person throws a ball upward into the air with an initial velocity of 15 m/s calculate a)how high it goes? b)how long the ball is in the air before it comes back ? c)how much time it takes for the ball to reach the maximum height?
November 19, 2011 by nour

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