Sunday
August 2, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 330 m/s.
Thursday, February 26, 2015 by Anonymous

physics
Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 21.0 m/s. Both screech, one emitting a frequency of 3200 Hz and the other one of 3800 Hz. What frequencies do they receive if the speed of sound is 330 m/s?
Thursday, February 26, 2015 by Anonymous

physics
Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 21.0 m/s. Both screech, one emitting a frequency of 3200 Hz and the other one of 3800 Hz. What frequencies do they receive if the speed of sound is 330 m/s?
Thursday, February 26, 2015 by Anonymous

physics
Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 21.0 m/s. Both screech, one emitting a frequency of 3200 Hz and the other one of 3800 Hz. What frequencies do they receive if the speed of sound is 330 m/s?
Thursday, February 26, 2015 by Anonymous

Physics mechanics
Car travelling speed 30 km/h stops after 8m distance through brakes.If same car moves at 60km/h. what is the stopping distance
Thursday, February 26, 2015 by Anonymous

physics
a thin rod of length 3l is bent at aright angle at adistance of l of on the x axis and at adistance of 2l on the y axis locate the center of mass with respect to the corner tale and l is1.2
Thursday, February 26, 2015 by bitsat

physics
As part of an exercise program, a woman walks south at a speed of 2.00 m/s for 60.0 minutes. Then she turns around and walks north a distance 3000 m in 25.0 minutes. (a) What is the woman's average velocity during her entire motion? (b) What is the woman's average ...
Thursday, February 26, 2015 by Anonymous

Physics
Two men of the same mass climb the same flight of stairs. The first man climbs the stairs for 25 seconds, while the seconds person takes 35 seconds. Which man does the most work?
Thursday, February 26, 2015 by Justin

Physics
The drawing shows six point charges arranged in a rectangle. The value of q is 3.15 μC, and the distance d is 0.321 m. Find the total electric potential at location P, which is at the center of the rectangle.
Thursday, February 26, 2015 by Anonymous

physics 100
An aluminum wing on a passenger jet is 30 m long when its temperature is 20°C. At what temperature would the wing be 5 cm (0.05 m) shorter?
Thursday, February 26, 2015 by jess

Physics
A uranium nucleus (mass 238 u, charge 92e) decays, emitting an alpha particle (mass 4 u, charge 2e) and leaving a thorium nucleus (mass 234 u, charge 90e). At the instant the alpha particle leaves the nucleus, the centers of the two are 5.5fm apart and essentially at rest. ...
Thursday, February 26, 2015 by Nguyen Nguyen

physics
A mass of 337 g connected to a light spring of force constant 19.4 N/m oscillates on a horizontal, frictionless track. The amplitude of the motion is 5.4 cm. Calculate the total energy of the system. Answer in units of J.
Thursday, February 26, 2015 by Bee

Physics
A parallel plate capacitor has a rectangular plates with length 5cm and width 3cm. They are separated by a distance 12m and hooked up to a 20V battery A.) what is the area of each plate in m^2 B.) assuming nothing else is present on the circuit what is the potential difference...
Wednesday, February 25, 2015 by Macy

Physics
An infinite,insulating sheet has a surface charge density 3.14C/m^2 the height is 12km A.) find the surface area of the Gaussian surface B.) find the total charge C.) find the total electric flux D.) use Guass's law to find the electric field at a height h=12km above the ...
Wednesday, February 25, 2015 by Macy

Physics
A long insulating wire has a uniform charge density 7nC/m and r=3m away from the wire A.) surface area of the side of the Gaussian surface B.) find total charge enclosed by the Gaussian surface C.) find total electric flux D.) use Guass's law to find the electric flux at r=3m
Wednesday, February 25, 2015 by Macy

physics
an astronaut is competing in mars olympic game her mass is 50 kg she will drive from tower 17 mm above a pool of water how much work in nj must she do to climb 17m
Wednesday, February 25, 2015 by Anonymous

physics
how much work is done by the upward force of your head on a 50 N rock that you carry horizontally across a 10 m room?
Wednesday, February 25, 2015 by Sophia

Physics
How much work does spike do when he pulls a 50 kg sled with a force of 200 N with a rope at an angle of 30 degrees above the horizontal, 20 m?
Wednesday, February 25, 2015 by Mireya

physics
A supertanker with the mass of 5.55 × 108 kg is moving with a constant velocity. Its engines generate a forward thrust of 4.55 × 105 N. Determine (a) the magnitude of the resistive force exerted on the tanker by the water and (b) the magnitude of the upward buoyant...
Wednesday, February 25, 2015 by Fahmi

Physics
A 58 kg woman is ice-skating toward the east on a frictionless frozen lake when she collides with a 94 kg man who is ice-skating toward the west. The maximum force exerted on the woman by the man during the collision is 210 N, west. Take east to be the positive direction of ...
Wednesday, February 25, 2015 by Kelvin

physics
A Navy jet (see the figure) with a weight of 219 kN requires an airspeed of 87 m/s for liftoff. The engine develops a maximum force of 100 kN, but that is insufficient for reaching takeoff speed in the 85 m runway available on an aircraft carrier. What minimum force (assumed ...
Wednesday, February 25, 2015 by John

physics
Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 23.0 m/s. Both screech, one emitting a frequency of 2600 Hz and the other one of 3800 Hz. What frequencies do they receive if the speed of sound is 330 m/s?
Wednesday, February 25, 2015 by Anonymous

Physics
An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender handrail of solid steel. The speeds of sound in air, water, and the handrail are 343, 1482, and 5040 m/s, respectively. The ...
Wednesday, February 25, 2015 by Anonymous

Physics
A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 332 m/s.
Wednesday, February 25, 2015 by Anonymous

Physics
The A string on a string bass is tuned to vibrate at a fundamental frequency of 59.0 Hz. If the tension in the string were increased by a factor of 4, what would be the new fundamental frequency?
Wednesday, February 25, 2015 by Anonymous

Physics
Pam has a mass of 35.5 kg and she is at rest on smooth, level, frictionless ice. Pam straps on a rocket pack. The rocket supplies a constant force for 29.2 m and Pam acquires a speed of 64.1 m/s. What is the magnitude of the force?
Wednesday, February 25, 2015 by Andres

Physics
A string of length 2.7 m is fixed at both ends. When the string vibrates at a frequency of 90.0 Hz, a standing wave with 5 loops is formed. What is the wavelength of the waves that travel on the string?
Wednesday, February 25, 2015 by Anonymous

Physics
A sound wave is incident on a pool of fresh water. The sound enters the water perpendicularly and travels a distance of 0.55 m before striking a 0.10-m-thick copper block lying on the bottom. The sound passes through the block, reflects from the bottom surface of the block, ...
Wednesday, February 25, 2015 by Anonymous

physics
The fundamental frequency of a string fixed at both ends is 384 Hz. How long does it take for a wave to travel the length of this string?
Wednesday, February 25, 2015 by Anonymous

physics
If micheal Jordan has a vertical leap of 1.29 m, what is his take off speed and his hang time(total time to move upwards to the peak and then return to the ground)?
Wednesday, February 25, 2015 by Terry

Physics
A block is released from rest at the top of an incline which makes a 30 degree angle with the horizontal. The incline is 12m long and it takes the block 25 seconds to reach the bottom. What is the coefficient of kinetic friction, µk, between the block and the incline?
Wednesday, February 25, 2015 by Nate

Physics
Speed: A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block, giving rise to an acceleration of 3 m/s2. What is the speed of the block after 10s? I think I would just multiple the two and put it in terms of speed but I am not sure.
Wednesday, February 25, 2015 by Rachel

physics
A fighter pilot is exposed to an acceleration of 3g in the horizontal direction during takeoff. Knowing that 1g=9.8 m/s2 and that the mass of the fighter pilot is 63.6 kg, what force (in Newtons) does the fighter pilot experience in the horizontal direction? This is the force ...
Wednesday, February 25, 2015 by Morgan

Physics
Calculate the size of the gravitational pull of a sphere of mass 10kg on a mass 2.0kg when their centres are 0.2m apart. What is the force of the 2.0kg mass on the 10kg mass?
Wednesday, February 25, 2015 by Nicole

physics
what is the magnitude kinetic frictional force between a 1500 kg car decelerating at a rate of 5.0m/s^2 skidding across a horizontal road.
Wednesday, February 25, 2015 by doc

Physics
Calculate the weight of an astronaut whose mass (including spacesuit)is 72kg on the surface of the moon? What is the astronauts weight on Earth? Comment on the difference
Wednesday, February 25, 2015 by Nicole

physics
what is the amount of force needed to move an object that has a mass of 2.0kg at an acceleration of 3.0m/s^2 with the force acting on the object at a 30 degree angle
Wednesday, February 25, 2015 by tom

physics
A person in a kayak starts paddling, and it accelerates from 0 to 0.63 m/s in a distance of 0.45 m. If the combined mass of the person and the kayak is 69 kg, what is the magnitude of the net force acting on the kayak?
Wednesday, February 25, 2015 by Anonymous

Physics
A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 28∘ above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down ...
Wednesday, February 25, 2015 by Navi

physics
The 1.1kg physics book in figure is connected by a string to a 250g coffee cup. The book is given a push up the slope and released with a speed of 2.5m/s . The coefficients of friction are μs =0.50 and μk =0.20. How far does the book slide?
Wednesday, February 25, 2015 by Anonymous

physics
A skateboarder in a death defying stunt decides to launch herself from a ramp on a hill. The skateboarder leaves the ramp at a height of 1.4m above the slope, traveling 15m/s and at an angle of 40 degrees to the horizontal. The slope is inclined at 45 degrees to the horizontal...
Wednesday, February 25, 2015 by carolyn

Physics
Six point charges of equal magnitude q are at the corners of a regular hexagon that has sides of length d. All the odd number charges are positive and all the even number charges are negative (so that there are three positive and three negative charges and there is a negative ...
Wednesday, February 25, 2015 by Anonymous

physics
Why is blood pressure called excess pressure? Use the term true pressure. Thank you for your help!
Wednesday, February 25, 2015 by Alicia

physics
What is the relationship between the coefficient of friction and the time that it takes the object to reach the bottom of the ramp?
Wednesday, February 25, 2015 by Steph

physics
An employer found out that his worker has been stealing money from his business for some time. though he has not caught him red handed, the overwhelming circumstantial evidences leaves no doubt at all about the theft. He is the only worker and the money gets missing only after...
Wednesday, February 25, 2015 by nabila

physics
Why do we measure blood pressure in mercury?
Wednesday, February 25, 2015 by Alicia

physics
A copper block of mass 500gm and spcific heat0.1cal/gm celcius is heated from30degrees to 290degrees celcius the thermal capacity of block is
Wednesday, February 25, 2015 by vishal

physics
Water flows over the edge of a waterfall at a rate of 1.2 x 106 kg/s. There are 50.0 m between the top and bottom of the waterfall. How much power is generated by the falling water by the time it reaches bottom?
Wednesday, February 25, 2015 by Anonymous

physics
A skateboarder in a death defying stunt decides to launch herself from a ramp on a hill. The skateboarder leaves the ramp at a height of 1.4m above the slope, traveling 15m/s and at an angle of 40 degrees to the horizontal. The slope is inclined at 45 degrees to the horizontal...
Wednesday, February 25, 2015 by carolyn

Physics
The HCl molecule consists of a hydrogen atom (mass 1u) and a chlorine atom (mass 35u). The centres of the two atoms are separated by 127pm (=1.27x10-10m). What is the moment of inertia, I, about an axis perpendicular to the line joining the two atoms which passes through the ...
Wednesday, February 25, 2015 by Akki

Physics
I have a resistor of 230 [Ohm] and apply a voltage across it of 9 [Volt]. What is the current through the resistor in milliAmp? [mA]
Wednesday, February 25, 2015 by Isa

Physics help
Describe each type of item tested in terms of its V vs I being "Ohmic" or not. Use one sentence per item-type tested. Item types tested are Resistors, Coil, Diode, Capacitors, and Light Bulb.
Wednesday, February 25, 2015 by Bri

Physics
Two blocks are connected by a string on a pulley. One block is on an incline, and the other is hanging. The smooth inclined surface makes an angle of 35 ∘ with the horizontal, and the block on the incline has a mass of 5.7 kg. The mass of the hanging block is m = 4.0kg...
Wednesday, February 25, 2015 by Natalie

Physics
two small spheres lie 1.5 meters apart and carry identical charges. How large is the charge on each if a sphere experiences a force of 2.0 N.
Tuesday, February 24, 2015 by Joe

physics
A 0.125 kg mass is attached to a spring and undergoes simple harmonic motion with a pe- riod of 0.41 s. The total energy of the system is 2.5 J. Find the amplitude of the motion. Answer in units of m.
Tuesday, February 24, 2015 by Anonymous

Physics
The bird perched on the swing shown below has a mass of 42.7 g, and the base of the swing, y = 7.54 cm below the hook, has a mass of 133 g. The swing and bird are originally at rest, and then the bird takes off horizontally at 2.04 m/s. How high will the base of the swing rise...
Tuesday, February 24, 2015 by Terence

Physics
A 2050 kg car traveling at 11.0 m/s collides with a 2780 kg car that is initially at rest at the stoplight. The cars stick together and move 3.10 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that ...
Tuesday, February 24, 2015 by Terence

physics
A block with a mass of 4.25 kg is placed at rest on a surface inclined at an angle of 44.8° above the horizontal. The coefficient of static friction between the block and the surface is 0.520, and a force of magnitude $F$ pushes upward on the block, parallel to the ...
Tuesday, February 24, 2015 by Brad

physics
The half-life of carbon-14 is 5730 years. How much of a 50 g sample of carbon-14 is present after 11,460 years?
Tuesday, February 24, 2015 by Kareem

Physics
The crane shown in the drawing is lifting a 170-kg crate upward with an acceleration of 1.1 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 ...
Tuesday, February 24, 2015 by John

Physics
at a drag race a jet car travels 1/4 miles in 5.2 seconds. what is the final speed of the car and its acceleration?
Tuesday, February 24, 2015 by Zara

physics
A golfer takes two putts to sink the ball, one is (81.6 ft, 31.7 degrees N of E) and the other is (3.20 ft, 53.4 degrees W of N). What is the displacement of the single putt that would sink the ball on the first try? Well, what I did was make a diagram of the two vectors, I ...
Tuesday, February 24, 2015 by Henry

Physics
A 5.0x10^-3 m^3 container holds 4.90 g gas when the pressure is 75.0 cm Hg and the temperature is 50.0 degrees C. What will be the pressure if 6.00 g of this gas is confined to a 2.0x10^-3 m^3 container at 0.0 degrees C? Do I simply need to use the combined gas law or does the...
Tuesday, February 24, 2015 by Help2

Physics
A charge of +444 μC is fixed at the center of a square that is 0.47 m on a side. How much work is done by the electric force as a charge of +5.8 μC is moved from one corner of the square to any other empty corner?
Tuesday, February 24, 2015 by John

Physics
An 80-ft-diameter Ferris wheel rotates once every 23s. What is the apparent weight of a 80kg passenger at the lowest point of the circle? Express your answer in SI units. I know to use the equation mg-N=m(v^(2)/r) but I can't figure out how to come away with the apparent ...
Tuesday, February 24, 2015 by Skyler

physics
A racing cyclist accelerates 5m/s² when she starts from rest. The total mass of the cyclist and her bicycle is 45kg. Calculate the resultant force that produces this acceleration
Tuesday, February 24, 2015 by help

physics
Tires on a car have a diameter of 2 ft and are warranted for 60 000 miles. a) Determine the angle (in radians) through which one of these tires will rotate during the warranty period. b) How m,any revolutions of the tire are equivalent to your answer in, part a)? i have drawn ...
Tuesday, February 24, 2015 by 7876

Physics
The HCl molecule consists of a hydrogen atom (mass 1u) and a chlorine atom (mass 35u). The centres of the two atoms are separated by 127pm (=1.27x10-10m). What is the moment of inertia, I, about an axis perpendicular to the line joining the two atoms which passes through the ...
Tuesday, February 24, 2015 by Akki

Physics
A flight controller determines that an airplane is 34.0mi south of him. Half an hour later, the same plane is 42.0mi northwest of him. The general direction of the airplane’s velocity is? If the plane is flying with constant velocity, what is the direction of its velocity...
Tuesday, February 24, 2015 by Michael

physics
when an aluminim is immersed in water it displaces 5 kg of water .how is the bouyant force acting on the aluminium object in newtons?(g=10m/s)
Tuesday, February 24, 2015 by junaid

Physics
A uniform 12 kg ladder 2.8 m long rests against a vertical frictionless wall with it's lower end 1.1 m from the wall, if the ladder is to stay in place. What must be minimum coefficient of friction between the bottom of the ladder and the ground
Tuesday, February 24, 2015 by Karar

Physics
A 2160 kg car traveling at 10.5 m/s collides with a 2740 kg car that is initially at rest at the stoplight. The cars stick together and move 4.00 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that ...
Tuesday, February 24, 2015 by John

physics
In an arcade game, a 0.18 kg disk is shot across a frictionless horizontal surface by being compressed against a spring and then released. If the spring has a spring constant of 237 N/m and is compressed from its equilibrium position by 6.6 cm, what is the magnitude of the ...
Tuesday, February 24, 2015 by Sarah

Physics
A thin insulating rod with charge density +5nC/m is arranged inside a thin conducting cylindrical shell of radius R=3cm. The rod and shell are on the same axis, and you can assume they are both infinite in length. What is the surface charge density induced on the outside of ...
Tuesday, February 24, 2015 by Help

physics
A 21.0-kg child descends a slide 2.20m high and reaches the bottom with a speed of 1.40m/s . How much thermal energy due to friction was generated in this process?
Monday, February 23, 2015 by Melissa

physics
The coefficients of static and kinetic friction between a 43 kg box and a horizontal surface are 0.72 and 0.20, respectively. (a) What is the acceleration of the object if a 135 N horizontal force is applied to the box? (b) What is the acceleration if the applied force is 480 N
Monday, February 23, 2015 by Bri

Physics
After a snowstorm a boy and girl decide to have a snowball fight. The girl uses a large slingshot to shoot snowballs at the boy. Assume that the girl fires each snowball at an angle 0 from the ground and that the snowball travel with an initial velocity of V0.. 1.in terms of ...
Monday, February 23, 2015 by JIm

Physics
Please help due in less than 2 hours!! A person whose mass is m = 86.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 21.3° with the horizontal. What is the reading on the scale? i've tried m*g*sin(21.3) and it still ...
Monday, February 23, 2015 by anon

Physics
A cube of mass m1 = 6.8 kg is sitting on top of another cube of the same size and mass m2 = 0.7 kg while they are both in free-fall. Ignoring any air resistance, what is the magnitude of the normal force with which the bottom cube is acting on the top cube? I've tried ...
Monday, February 23, 2015 by anon

physics
What is the force a rock exerts if it's mass is 36,000 kg and the acceleration due to Gravity is 9.8 m/s2
Monday, February 23, 2015 by Anonymous

physics
A piece of wire is wound exactly 100 times around a circular tube with a radius of 9.8 centimeters. Find the length of the piece of wire in meters.
Monday, February 23, 2015 by Killian

physics
In being served, a tennis ball is accelerated from rest to a speed of 25.5 m/s. The average power generated during the serve is 2920 W. Assuming that the acceleration of the ball is constant during the serve, find the force acting on the ball.
Monday, February 23, 2015 by Anonymous

Physics
A plane is flying 250 m/s west with a crosswind of 25 m/s north affecting the flight. What is the magnitude and direction of the plane?
Monday, February 23, 2015 by Madi

Physics
An object experiences a constant acceleration of 4.0 m/s2 along the −x axis for 4s, obtaining a velocity of 31 m/s in a direction 30° from the +x axis. Find the initial velocity vector of the object. (The angle of the object is measured counterclockwise from the +x-...
Monday, February 23, 2015 by Daniel

physics
In a region where the electric field is constant, as it is between two oppositely charged parallel plates, is the voltage also constant?
Monday, February 23, 2015 by moooose

physics
Two carts are involved in an elastic collision. Cart A with mass 0.55 kg is moving towards Cart B with mass 0.55 kg, which is initially at rest. Cart A stops after the collision and Cart B begins to move. What is the final kinetic energy of Cart B?
Monday, February 23, 2015 by please help me

physics
The Speed By Which A Sound Travels In A Water Of Depth 300m,is 216km/h.Calculate The Time Taken By The Sound At That Depth.
Monday, February 23, 2015 by oketunde olalekan

physics
Calculate the distance between the center of the earth and the center of the moon at which the gravitational force exerted by the earth on an object is equal in magnitude to the force exerted by the moon on the object.
Monday, February 23, 2015 by Cali

physics
A car traveling at 20 m/s stops in a distance of 50 m. Assume that the deceleration is constant. The coefficients of friction between a passenger and the seat are µs = 0.5 and µk = 0.03. Will a 70-kg passenger slide off the seat if not wearing a seat belt?
Monday, February 23, 2015 by Tommy

Physics
A garden roller is kept at rest on a slope that makes an angle of 30 degrees the horizontal by an upward force of 2 500N parallel to the slope. 1. Calculate the mass of the roller? 2. Determine the magnitude of the force exerted by the surface on the roller?
Monday, February 23, 2015 by Anelisa

Physics
A 5.5 kg block is released from rest on a frictionless inclined plane making an angle of 23.3° with the horizontal. Calculate the time it will take this block when released from rest to travel a distance of 0.7 m along the ramp.
Monday, February 23, 2015 by Anonymous

physics
A ball which is at rest is dropped from a hight h meter as it bound off the flour its speed is 80% of what it was just before touching the ground the ball will rise nearly to rise of
Monday, February 23, 2015 by faizi

physics
Water flows over the edge of a waterfall at a rate of 1.2 x 106 kg/s. There are 50.0 m between the top and bottom of the waterfall. How much power is generated by the falling water by the time it reaches bottom?
Monday, February 23, 2015 by Guy M.

Physics
The magnitude of the velocity of a projectile when it is at its maximum height above ground level is 12 m/s. (a) What is the magnitude of the velocity of the projectile 1.7 s before it achieves its maximum height? (b) What is the magnitude of the velocity of the projectile 1.7...
Monday, February 23, 2015 by Ludvig

physics
how much heat must be removed from 14 lbs of aluminum block in order to cool it from 80 degrees fahrenheit to 15 degrees fahrenheit?
Monday, February 23, 2015 by asap

physics
why we derive our hands upwards and backwards to catch the ball?
Monday, February 23, 2015 by Haya Khan

Physics
How to determine the work done on the object with a FCosTheta(Y axis)-Displacement(X axis) graph.
Monday, February 23, 2015 by Jennifer

physics
Stuck on solving for unknowns in part F and G help please? a) the upper loop 1 18I12+ 13I18=30 (b) the lower loop 2 =5.00I36 - 18I12= 24 (c) the node on the left side 3 I12+I36=I18 (d) Solve the node equation for I36. 4 I12 - I18 =I36 e) Using the equation found in (d), ...
Monday, February 23, 2015 by MIKE

physics(waves)
A wave has a speed of 340m/s and a period of 0.28ms. what's the wavelength? so I worked this and I got 95.2m but the answer to d question says 0.095m. period(T) = 1/F (since F = 1/T) therefore, F = 1/0.28 = 3.5714 wavelength = velocity/frequency w = 340/3.5714 = 95.2m (Isn...
Monday, February 23, 2015 by Francis

Physics
A bead slides without friction around a loopthe-loop. The bead is released from a height of 18.9 m from the bottom of the looptheloop which has a radius 7 m. The acceleration of gravity is 9.8 m/s^2. What is its speed at point A ? Answer in units of m/s.
Monday, February 23, 2015 by monica :)

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