Friday

October 31, 2014

October 31, 2014

Number of results: 21,665

**Physics**

A ball is fastened to one en of a 28 cm string, and the other end is held fixed to a support. The ball whirls in a horizontal circle. Find the speed of the ball in its circular path if the string makes an angle of 35 degrees to the vertical.
*May 16, 2013 by Andrea*

**physics**

When rolling along the felt on the billiard table, the ball experiences a frictional force of 0.2 N. a. What is the deceleration of the ball on the felt? b. How far will the ball roll before stopping? c. Explain this in terms of Newtons first law of motion.
*March 14, 2014 by Swastika*

**Physics**

A 47.0-g Super Ball traveling at 29.5 m/s bounces off a brick wall and rebounds at 15.5 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 5.00 ms, what is the magnitude of the average acceleration of the ball during this time interval?
*September 14, 2014 by Rin*

**Physics**

A 47.0-g Super Ball traveling at 29.5 m/s bounces off a brick wall and rebounds at 15.5 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 5.00 ms, what is the magnitude of the average acceleration of the ball during this time interval?
*September 14, 2014 by Anonymous*

**PHYSICS Urgent help please**

A red ball is thrown up off the edge of a building 10 m tall with an initial speed of 4 m/s. A) how long does it take for the red ball to strike the ground below? B) If a black ball is dropped off the edge of the same building, how many seconds after the release of the red ...
*November 15, 2012 by Dave*

**College Physics**

A positively charged rubber rod is moved close to a neutral copper ball that is resting on a nonconducting sheet of plastic. a) Sketch the distribution of the charges on the ball. b) With the rod still close to the ball, a metal wire is briefly connected from the ball to the ...
*January 21, 2008 by Jen*

**physics**

In order to convert a tough split in bowling, it is necessary to strike the pin a glancing blow as shown in the figure. Assume that the bowling ball, initially traveling at 15.0 m/s, has four times the mass of a pin and that the pin goes off at 75° from the original direction ...
*October 20, 2011 by kago*

**physics**

A red ball is thrown up off the edge of a building 10 m tall with an initial speed of 4 m/s. A) how long does it take for the red ball to strike the ground below? B) If a black ball is dropped off the edge of the same building, how many seconds after the release of the red ...
*November 14, 2012 by Matt*

**physics**

I need help with an equation for: Find the force of attraction between a bowling ball of mass 7.26 kg and the earth if the bowling ball was located at sea level. How does this compare to the weight of the bowling ball as calculated by Fg = mg? Thank you
*December 12, 2010 by anonymous*

**Physics**

a 0.2kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30 m/s and rebounds up at 25 m/s. If the ball is in contact with the sidewalk for 0.025s, what is the magnitude of the average force applied by the sidewalk on the ball?
*October 21, 2012 by Jazmin*

**Physics**

A golfer drives a golf ball with a velocity of 100 ft/sec and an angle of 45 degrees. A. find the time of travel for the ball. B. Find the balls range. C. Find the maximum height of the ball
*November 5, 2012 by Alfred*

**physics**

A ball is rolling on a table and leaves the end side of the table with a velocity of 1.5 m/s. The table is 0.70 m high and the ball has a mass of 0.850 kg. What's the speed of the ball when it hits the ground? What equation should I use?
*October 12, 2014 by Richard*

**fizik**

A 2kg ball,A moves to the right with velocity 4 m/s collides with another 1kg ball,B moving in the opposite way with velocity 0.5m/s. after the collision, both ball move at 30 degree and 15 degree from horizontal. calculate the final velocity of each ball after the collision. ...
*April 6, 2011 by alya*

**physics**

A 2.00 kg ball is attached to a ceiling by a 1.40 m long string. The height of the room is 3 m. What is the gravitational potential energy of the ball relative to the ceiling? What is the gravitational potential energy of the ball relative to the floor? (c) What is the ...
*November 7, 2009 by Anonymous*

**Physics**

A 3.23 kg ball is attached to a ceiling by a 1.31 m long string. The height of the room is 5.75 m. What is the gravitational potential energy of the ball relative to the ceiling? What is the gravitational potential energy of the ball relative to the floor? What is the ...
*March 9, 2013 by Anonymous*

**Physics**

A ball is thrown straight upward (along the y-axis) with an initial velocity of 16 m/s from the top of a building located 20 m above ground. Find the maximum height of the ball. In other words, find the ball's maximum distance from the ground. Be aware that once you find the ...
*June 20, 2011 by Promise*

**Phy**

A 2.0 kg ball is placed against a spring of force constant 750N/m, which has been compressed 0.28m. The spring is released and the ball moves along a horizontal frictionless surface and up a ramp. Calculate the... a) maximum elastic potential energy of the spring (could it be ...
*January 14, 2013 by Shanelle*

**physical science**

A soccer player applies a force of 51.5 N to a soccer ball while kicking it. If the ball has a mass of 0.46 kg, what is the acceleration of the soccer ball?
*March 29, 2012 by Tityana*

**science proyect**

Which type of ball will bounce highest when dropped from a height of 48 inches, a 8 inches ball(small) or a 12 inches ball(big)?
*December 1, 2013 by kamaaya*

**Physics**

A golfer has to hit a ball over a tree that is 12.0 meters high from 40.0 meters away. The ball is hit with speed v at an angle (-) to the horizontal. Neglect any effect due to air. The golfer hits the ball with an initial velocity 30 degrees to the horizontal. Calculate the ...
*February 7, 2013 by Emilea*

**physics**

A 2.99 kg ball is dropped from the roof of a building 161.9 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 12.3 N on the ball. How long does it take to hit the ground> The acceleration of gravity is 9.81 m/s2. Answer the units in s...
*November 7, 2010 by brian*

**College Physics**

A ball of mass 620 g hangs from a spring whose stiffness is 195 newtons per meter. A string is attached to the ball and you are pulling the string to the right, so that the ball hangs motionless, as shown in the figure. In this situation the spring is stretched, and its length...
*October 5, 2012 by Anabel*

**Physics**

On a distant planet, golf is just as popular as it is on earth. A golfer tees off and drives the ball 4.3 times as far as he would have on earth, given the same initial velocities on both planets. The ball is launched at a speed of 40 m/s at an angle of 46° above the ...
*September 19, 2011 by Kendra*

**Physics**

In the figure, two balls are located in deep space. The black ball has mass 56kg and the red ball has mass 17kg. The distance between the two balls is r=24cm. (a) Find the magnitude of the acceleration of the red ball. m/s2 (b) If r is 5 times larger, with what factor will the...
*March 8, 2012 by Sarah*

**Physics**

Ok, so this probem is kinda complicated, so ask me if you need clarification. This problem deals with Impulse and Momentum. There are two balls hanging vertically from a horizontal plane. Ball A is pulled back and is set up to strike ball B. Given for ball A - mass = 1.5 kg. ...
*November 29, 2006 by Jared*

**Physics**

A bowling ball weighing 71.2 is attached to the ceiling by a 3.50 rope. The ball is pulled to one side and released; it then swings back and forth like a pendulum. As the rope swings through its lowest point, the speed of the bowling ball is measured at 4.20. 1)At that instant...
*June 27, 2010 by Madeline*

**algebra**

A baseball player hits a ball toward the outfield. The height h of the ball in feet is modeled by h(t) = -16t2 + 22t + 3, where t is the time in seconds. If no one catches the ball, how long will it stay in the air? (Round to the nearest tenth of a second and enter only the ...
*February 13, 2014 by Ashlee*

**Physics**

Regading my question yesterday about the ball being caught by the man on the scales (Sun. 3:47), I'm now wondering if, to get the final weight on the scales I need to add the actual ball's mass of .50 kg AS WELL AS the force of the ball on the man to his original weight in ...
*March 23, 2009 by Brigid*

**Thermochemistry**

Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial speed of 4.5 m/s. As it travels, it loses some of its energy as heat. The ball slows down to 3.5 m/s and then collides straight-on with a second billiard ball of equal mass. The first billiard ball ...
*October 30, 2009 by Kyle*

**physics**

A bowling ball weighing 71.8 N is attached to the ceiling by a rope of length 3.83 m. The ball is pulled to one side and released; it then swings back and forth as a pendulum. As the rope swings through the vertical, the speed of the bowling ball is 4.50 m/s. What is the ...
*September 23, 2010 by ami*

**algebra**

A student threw a ball directly upward from the balcony of a building. The height of the ball as measured from the ground "t" seconds after it was thrown, is given by the expression h= -16t(2nd power) + 64t + 768 When does the ball reach the ground?
*September 14, 2009 by Pat*

**physics 101**

A 51.5-g Super Ball traveling at 29.0 m/s bounces off a brick wall and rebounds at 19.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.60 ms, what is the magnitude of the average acceleration of the ball during this time interval?
*September 7, 2011 by Anonymous*

**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*

**physics**

When serving a tennis ball, the player hits it when its velocity is zero (at the highest point of a vertical toss). The racket exerts a force of 560 N on the ball for 5.00 ms, giving it a final velocity of 45.0 m/s. Using these data, find the mass of the ball.
*December 19, 2011 by Amelia*

**physics**

When serving a tennis ball, the player hits it when its velocity is zero (at the highest point of a vertical toss). The racket exerts a force of 560 N on the ball for 5.00 ms, giving it a final velocity of 45.0 m/s. Using these data, find the mass of the ball.
*December 19, 2011 by Amelia*

**Calculus (Vector-Valued Functions)**

"a ball is thrown horizontally from the top of a cliff 256 ft high with an intial speed of 50 ft/sec. find the time of flight of the ball and the distance from thr base of the cliff to the point where the ball lands"
*January 27, 2012 by TheThinker*

**physics**

A large air-filled rubber ball is tethered to the bottom of a swimming pool. The tension in the tether is 100N. The mass of the rubber in the ball itself is 2kg while pwater=1000kgm(-3) and pair=1.2 kgm(-3). What is the volume of the ball?
*September 27, 2012 by brenda*

**Physics**

A football player throws a ball with a horizontal distance of 31.0 m so that the other player catches it at the exact height it was initially thrown. If the ball rises and falls by 1.8 m in its trajectory, what is the initial velocity of the ball? Please give the speed and ...
*October 13, 2012 by Darrell*

**Physics**

A soccer ball kicked on a level field has an initial vertical velocity component of 15 meters per second. Assuming the ball lands at the same height from which it was kicked, what is the total time the ball is in the air? [Neglect friction.]
*November 14, 2012 by Shannon *

**Physics**

A 50.0 g Super Ball traveling at 27.0 m/s bounces off a brick wall and rebounds at 17.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 4.00 ms, what is the magnitude of the average acceleration of the ball during this time interval? (...
*January 24, 2013 by Robert *

**physics**

A 52.5g super ball traveling at 28.0m/s bounces off a brick wall and rebounds at 18.5m/s. A high speed camera records this event. If the ball is in contact with the wall for 4.10ms, what is the magnitude of the average acceleration of the ball during this time interval?
*February 4, 2013 by george*

**physics**

A small plastic ball of mass m = 1.50 g is suspended by a string of length L = 15.5 cm in a uniform electric field, as shown in the figure below. If the ball is in equilibrium when the string makes a θ = 19.0° angle with the vertical as indicated, what is the net charge ...
*March 15, 2013 by bob*

**PHYSICS**

Max is throwing a 57g tennis ball upward and hitting it (with a racket) when it reaches the top of its flight. If the racket exerts an average force of 440N on the ball, find the speed of the ball after the collision (if they are in contact for 4.5ms)
*April 5, 2013 by R*

**Physics**

A steel ball hangs in a 147cm thread which is dragged right and then let go. Velocityh of the ball is 2,44m/s when it goes through the middle position. I dont have any mass given up. How many degrees to the side had the ball been dragged?
*March 31, 2014 by Paul*

**physics**

The velocity of a ball changes from ‹ 8, −5, 0 › m/s to ‹ 7.88, −5.28, 0 › m/s in 0.04 s, due to the gravitational attraction of the Earth and to air resistance. The mass of the ball is 140 grams. I calculated the acceleration and got <-3,-7,0> what is the ...
*June 28, 2014 by sam*

**physics**

a baseball (m = 153 g) approaches a bat horizontally at a speed of 41.0 m/s (92 mi/h) and is hit straight back at a speed of 45.8 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.05 ms, what is the average force exerted on the ball by the bat? Neglect the...
*November 9, 2011 by Kelsey*

**physics**

A baseball (m = 151 g) approaches a bat horizontally at a speed of 39.8 m/s (89 mi/h) and is hit straight back at a speed of 45.7 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.05 ms, what is the average force exerted on the ball by the bat? Neglect the...
*March 12, 2012 by Natasha*

**physics**

A baseball (m = 135 g) approaches a bat horizontally at a speed of 40.4 m/s (90 mi/h) and is hit straight back at a speed of 45.7 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.00 ms, what is the average force exerted on the ball by the bat? Neglect the...
*November 12, 2012 by Anonymous*

**Physics**

A baseball (m = 135 g) approaches a bat horizontally at a speed of 40.4 m/s (90 mi/h) and is hit straight back at a speed of 45.7 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.00 ms, what is the average force exerted on the ball by the bat? Neglect the...
*November 18, 2012 by D*

**Physics**

A baseball (m = 149 g) approaches a bat horizontally at a speed of 42.2 m/s (94 mi/h) and is hit straight back at a speed of 48.1 m/s (108 mi/h). If the ball is in contact with the bat for a time of 1.10 ms, what is the average force exerted on the ball by the bat? Neglect the...
*October 23, 2014 by Cammy*

**physics **

A tennis ball with a speed of 12.5 m/s is moving perpendicular to a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 11.4 m/s. If the ball is in contact with the wall for 0.0139 s, what is the average acceleration of the ball while it ...
*May 20, 2013 by john *

**physics**

a tennis player swings her 1000g racket with a speed of 6.00 m/s. she hits a 60g tennis ball that was approaching her at a speed of 18.0 m/s . the ball rebounds at 43.0 m/s. a)how fast is her racket moving immediately after the impact? you can ignor the interaction of the ...
*November 29, 2010 by Anonymous*

**physics**

Ball 1, with a mass of 180 g and traveling at 18 m/s, collides head on with ball 2, which has a mass of 370 g and is initially at rest (a) What are the final velocities of each ball if the collision is perfectly elastic? (b) What are the final velocities of each ball if the ...
*October 26, 2010 by Lucy*

**math**

a ball has a volume of 45. the radius of the larger ball is 3 times the small ball what is the volume?
*February 6, 2012 by tl*

**physics**

A solid sphere is released from the top of a ramp that is at a height h1 = 1.95 m. It goes down the ramp, the bottom of which is at a height of h2 = 1.38 m above the floor. The edge of the ramp is a short horizontal section from which the ball leaves to land on the floor. The ...
*November 30, 2012 by RagingRice*

**chemistry**

Are my answers correct? Identify each energy exchange as primarily heat or work and determine weather the sign of ΔE is positive or negative for the system. A. A rolling billiard ball collides with another billiard ball. The first ball (system) stops rolling after the ...
*April 8, 2014 by Justin*

**chemistry**

Are my answers correct? Identify each energy exchange as primarily heat or work and determine weather the sign of ΔE is positive or negative for the system. A. A rolling billiard ball collides with another billiard ball. The first ball (system) stops rolling after the ...
*April 8, 2014 by Justin*

**physics**

A ballplayer standing at homeplate hits a baseball that is caught by another player at the same height above the ground from which it was hit. The ball is hit with an initial velocity of 23.0 m/s at an angle of 58.0° above the horizontal. (a) How high will the ball rise? (b) ...
*February 14, 2010 by candace*

**Physics**

A tennis ball with a speed of 14m/s is moving perpendicular to a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 11.41m/s. If the ball is in contact with the wall for 0.0112s, what is the average acceleration of the ball while it is ...
*September 14, 2012 by sam*

**physics**

Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 12 m/s at an angle 35 degrees; with respect to the horizontal. Sarah catches the ball 1.5 meters above the ground. 1)What is the horizontal ...
*September 17, 2011 by aaa*

**Physics**

A ball is thrown straight up from the ground with speed v_0. At the same instant, a second ball is dropped from rest from a height H, directly above the point where the first ball was thrown upward. There is no air resistance. Find the value of H in terms of v_0 and g so that ...
*May 28, 2010 by Anonymous*

**Math**

A ball is dropped from a height of 36 feet. The quadratic equation d=1/2 gt^2 is used to calculate the distance (d) the ball has fallen after t seconds. The constant g is the acceleration of gravity, 9.8m/s^2. How long does it take the ball to hit the ground? A ball in problem...
*November 19, 2012 by Lux*

**Algebra 1**

A ball is thrown upward with an initial velocity of 35 meters per second from a cliff that is 80 meters high. The height of the ball is given by the quadratic equation h = -49t^2 + 35t + 140 where h is in meters and t is the time in seconds since the ball was thrown. Find the ...
*March 7, 2013 by Sherry*

**Physics**

A golfer hits a ball from the origin with an initial speed of 35 m/s at an angle of 44 degrees above the horizontal axis. The ball is moving down when it lands on a green that is 3.00 m above the level where it was struck. Neglect air resistance. 1. How long is the ball in the...
*May 25, 2011 by Lynn*

**loyla**

A bag contains one black ball and one white ball. Another black ball is put into the same bag and bag is shuffled. The first ball pulled out the bag is a black one. What are the chances of the next ball to be pulled out to be black?
*August 15, 2014 by rajshekar*

**physics**

A trained dolphin leaps from the water with an initial speed of 12 m/s. It jumps directly towards a ball held by the trainer a horizontal distance of 5.50 m away and a vertical distance of 4.10 m above the water. In the absence of gravity the dolphin would move in a straight ...
*May 20, 2012 by Tom*

**College Mathematics**

(odds) Playing Bingo:When playing bingo, 75 balls are placed in a bin and balls are selected at random. Each ball is marked with a letter and a number as indicated in the following chart: B: 1-15 I: 16-30 N:31-45 G:46-60 O:61-75. For example there are balls marked B1,B2 up to ...
*March 11, 2013 by slomomo*

**Physics **

At the 2014 ALCS game 2, the Royals started their right-handed pitcher Wade Davis whose fastball typically reaches 94 mph. if his throwing motion covers 2.8m from the position where his arm starts to make forward motion to release position, and the mass of the ball is 0.5lbs...
*October 19, 2014 by Sarah*

**Physics**

A child's game consists of a block that attaches to a table with a suction cup, a spring connected to that block, a ball, and a launching ramp. By compressing the spring, the child can launch the ball up the ramp. The spring has a spring constant k, the ball has a mass m, and ...
*November 7, 2008 by rachel*

**physics!**

A place kicker must kick a football from a point 36 m from the goal, and the ball must clear the crossbar, which is 3.05m high. When kicked, the ball leaves the ground with a speed of 20.0m/s at an angle of 53 degrees to the horizontal. a. by how much does the ball clear or ...
*December 9, 2008 by emily*

**Calculus**

A ball is thrown upward with an initial velocity of 96 feet per second from the top of a 100 foot building. (a) When well the ball attain its maximum height? (b) When will the ball hit the ground? Give a decimal answers correct to 2 decimal places.
*March 28, 2011 by Anonymous*

**Calculus**

A ball is thrown upward with an initial velocity of 96 feet per second from the top of a 100 foot building. (a) When will the ball attain its maximum height? (b) When will the ball hit the ground? Give a decimal answers correct to 2 decimal places.
*March 28, 2011 by Anonymous*

**calculus**

A ball is thrown upward with an initial velocity of 96 feet per second from the top of a 100 foot building. (a) When well the ball attain its maximum height? (b) When will the ball hit the ground? Give a decimal answers correct to 2 decimal places
*March 25, 2011 by Anonymous*

**Physics**

Would someone please show me a way to work this out A ball is dropped from the top of a building 150 m high. (Ignore air resistance) A. How long does it take the ball to hit the ground? B. What is the speed of the ball when it hits the ground?
*September 13, 2011 by missy*

**Calculus 3**

A ball is thrown at an angle of 45 degrees to the ground. If the ball lands 90m away, what is the initial speed of the ball? I know you use x(t)=(v*cos(alpha))t and y(t)=(v*sin(alpha))t-g/2t^2 but I'm still really confused about what to do. Please show all work. Thank you.
*February 26, 2012 by Anonymous*

**physics**

A tennis ball (m 57 g) is projected vertically with an initial speed of 8.8 m/s. (a) If the ball rises to a maximum height of 3.7 m, how much kinetic energy was dissipated by the drag force of air resistance? (b) How much higher would the ball have gone in a vacuum?
*October 24, 2012 by bee-z*

**Physics**

Place a small rubber ball on top of a basketball or soccer ball and then drop them together. If vertical alignment nicely remains as they fall to the floor, you’ll see that the small ball bounces unusually high. Can you reconcile this with energy conservation?
*September 22, 2013 by Miss Angie*

**Physics**

Place a small rubber ball on top of a basketball or soccer ball and then drop them together. If vertical alignment nicely remains as they fall to the floor, you’ll see that the small ball bounces unusually high. Can you reconcile this with energy conservation?
*December 8, 2013 by George*

**Physics (Rolling)**

In Fig. 11-35, a solid brass ball of mass m will roll smoothly along a loop-the-loop track when released from rest along the straight section. The circular loop has radius R, and the ball has radius r << R. (a) What is h if the ball is on the verge of leaving the track ...
*March 16, 2012 by M*

**Physics**

Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is unable to catch the ball anymore since the ...
*June 17, 2013 by Abhishek Ranjan*

**physics**

Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is unable to catch the ball anymore since the ...
*June 17, 2013 by Anonymous*

**physics**

Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is unable to catch the ball anymore since the ...
*June 18, 2013 by jack *

**physics(help!!!!!!!!!!!)**

A small ball of mass m=0.60 kg hangs from a massless string of length l=0.9 m. The ball travels in a vertical circle and its speed at the bottom is v0=6.0 m/s (see figure). Neglect all friction and air drag, and use g=10m/s^2 for the gravitational acceleration. The ball is so ...
*November 2, 2013 by Anonymous*

**physics ( help)**

Hypothetically, if you were standing on the balcony of an apartment on the 10th level of building and you throw a ball at 30° above the horizontal away from the building at 4.5m/s, how far from the building would the ball land?. The height from which the ball is thrown is ...
*April 25, 2011 by H.T*

**physics**

Croquet ball A moving at 8.0m/s makes a head on collision with ball B of equal mass and initially at rest. Immediately after the collision ball B moves forward at 7.1m/s . What fraction of the initial kinetic energy is lost in the collision?
*March 14, 2014 by Ina*

**PHYSICS**

Two balls collide on a horizontal, frictionless table. Ball A has a mass of 0.175 kg and travelling at 1.20 m/s [E 40o S]. Ball B has a mass of 0.225 kg and is travelling at 0.68 m/s [E]. The velocity of ball B after collision is 0.93 m/s [E 23o S]. What is the velocity of ...
*May 10, 2012 by myra*

**physics**

A ball of mass 0.1 kg is dropped from a height of 2 m onto a hard surface. If rebounds to a height of 1.5 m and it is in contact with the surface for 0.05s. Calculate the: (a) speed with which it strikes the surface. (b) speed with which it leaves the surface. (c) change in ...
*March 15, 2014 by waslat *

**physics**

A car P is moving with uniform speed of 5m/s towards a carriage of mass 9kg at rest kept on the rails at point B. the height of AC is 120m.cannon balls of 1kg are fired from the car with an initial velocity of 100m/s at an angle 30 degree with the horizontal.the first cannon ...
*January 16, 2011 by sreeram*

**Physics**

If we examine a ball in free fall, we find that the momentum of the ball is not constant. This is not a violation of the law of conservation of momentum because A) the force of gravity acts on the ball. B) the ball experiences an external force. C) the system is not closed. D...
*November 29, 2011 by Crystal*

**Physics**

Can someone please answer my question on this paragraph from my physics book regarding basic aerodynamics: "Now we consider a spinning baseball moving through the still air. As the ball spins, it tends to drag air around with it. If the streamlines are curved, there are ...
*October 20, 2009 by Sean*

**Physics-Intro**

A 0.600-kg ball traveling 4.00 m/s to the right collides with a 1.00-kg ball traveling 5.00 m/s to the left. After the collision, the lighter ball is traveling 7.25 m/s to the left. What is the velocity of the heavier ball after the collision?
*October 7, 2014 by Tommy*

**math/physics**

A 0.600-kg ball traveling 4.00 m/s to the right collides with a 1.00-kg ball traveling 5.00 m/s to the left. After the collision, the lighter ball is traveling 7.25 m/s to the left. What is the velocity of the heavier ball after the collision?
*October 7, 2014 by Jay*

**physics**

Suppose that you lob the ball with an initial speed of v = 16.1 m/s, at an angle of θ = 51.9° above the horizontal. At this instant your opponent is d = 11.2 m away from the ball. He begins moving away from you 0.400 s later, hoping to reach the ball and hit it back at ...
*October 19, 2011 by obinna*

**Physics **

A small lead ball, attached to a 1.50-m rope, is being whirled in a circle that lies in the vertical plane. The ball is whirled at a constant rate of three revolutions per second and is released on the upward part of the circular motion when it is 0.75 m above the ground. The ...
*February 26, 2013 by Randy*

**Physics**

A tennis ball is thrown vertically upward with an initial velocity of +8.0 m/s. a. what will the ball's speed be when it returns to its starting point? b. how long will the ball take to reach its starting point?
*September 24, 2008 by Eli*

**physics**

spherical aluminum ball of mass 1.22 kg contains an empty spherical cavity that is concentric with the ball. The ball just barely floats in water.Calculate the radius of the cavity.
*October 5, 2010 by jenna*

**Physics**

A soccer ball is kicked off a bridge with a height of 36 m. The ball travels 25 m horizontally before it hits the pavement below. What was the soccer ball’s speed when it was first kicked?
*October 19, 2011 by PIE*

**science**

Ball 2 with a mass of 30 kg, is moving left at 10 m/s. At what velocity should ball 1, with a mass of 10 kg, move to the right and collide with 2, so that ball 1 rebounds with a velocity of 10 m/s. assume that the collision is perfectly elastic.
*February 21, 2012 by Milli*

**Physics**

A tennis ball is thrown vertically upward with an initial velocity of 8.0 m/s. a) what will the ball's speed be when it returns to its starting point. b) how long will the ball take to reach it's starting point?
*September 15, 2012 by Anonymous*

**Physics**

A golfer tees off on level ground, giving the ball an initial speed of 46.5 m/s and an initial direction of 37.5 above the horizontal. a) how far from the golfer does the ball land? b) the next golfer in the group hits a ball with the same initial speed but at an angle above ...
*September 18, 2013 by Gabby*

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