Saturday

April 19, 2014

April 19, 2014

Number of results: 37,593

**physics**

A tennis player standing 9.7 m from the net hits the ball at 3.42° above the horizontal. To clear the net, the ball must rise at least 0.291 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the racquet?
*Tuesday, February 18, 2014 at 9:57pm by hatend*

**physics**

Ted Williams hits a baseball with an initial velocity of 120 miles per hour (176 ft/s) at an angle of è = 35 degrees to the horizontal. The ball is struck 3 feet above home plate. You watch as the ball goes over the outfield wall 420 feet away and lands in the bleachers. After...
*Saturday, September 17, 2011 at 1:12pm by aaa*

**physics**

Ted Williams hits a baseball with an initial velocity of 120 miles per hour (176 ft/s) at an angle of è = 35 degrees to the horizontal. The ball is struck 3 feet above home plate. You watch as the ball goes over the outfield wall 420 feet away and lands in the bleachers. ...
*Monday, September 19, 2011 at 2:07am by aaa*

**Physics**

A shell of a gun has a initial speed of 1700 m/s at initial inclination of 55◦ above the horiztontal. Ignore air resistance and other effects. a) what is the maximum height? B) what is the total time of the shell's flight? c) how far away did the shell hit?
*Friday, October 14, 2011 at 1:31am by Lala*

**ap physics**

Mass * (34.7 + 4.5) kg*m/s 4.5 m/s is an extremely slow speed for the thrown ball (16.2 mph) . I doubt if it would reach home plate if thrown horizontally from the pitcher's mound. Are you sure the speed was not 24.50 m/s?
*Saturday, January 7, 2012 at 8:14pm by drwls*

**Physics**

A solid ball and a hollow ball, each with a mass of 2 kg and radius of 0.1 m, start from rest and roll down a ramp of length 2 m at an incline of 34°. An ice cube of the same mass slides without friction down the same ramp. What is the speed of the solid ball at the bottom of ...
*Monday, June 18, 2012 at 6:39pm by James*

**physics**

Two stones, A and B, are thrown horizontally from the top of a cliff. Stone A has an initial speed of 15 meters per second and stone B has an initial speed of 30 meters per second. Compared to the time it takes stone A to reach the ground, the time it takes stone B to reach ...
*Monday, November 18, 2013 at 2:12pm by Anonymous*

**physics**

Part 2 You are a pirate working for Dread Pirate Roberts. You are in charge of a cannon that exerts a force 20000 N on a cannon ball while the ball is in the barrel of the cannon. The length of the cannon barrel is 2.19 m and the cannon is aimed at a 32◦ angle from the ...
*Friday, February 25, 2011 at 8:03pm by ally*

**Physics**

A girl notices a ball moving straight upward just outside her window. The ball is visible for 0.25 seconds as it moves a distance of 1.05m from the bottom to the top of the window. How long does it take before the ball reappears? What is the greatest height of the ball above ...
*Saturday, September 18, 2010 at 3:45pm by Jon*

**Science**

A golf ball and a ping-pong ball are dropped in a vacuum chamber. When they have fallen halfway down, they have the same... A.speed B.potential energy C.kinetic energy D.Rest Energy my thought is that its c, kinetic energy...but i'm not 100% sure
*Tuesday, January 23, 2007 at 6:32pm by Tammy*

**physics**

A billiard ball of mass 0.16 kg has a speed of 1.80 m/s and collides with the side of the billiard table at an angle of 34.6°. For this collision, the coefficient of restitution is 0.841. What is the angle relative to the side (in degrees) at which the ball moves away from the...
*Thursday, February 9, 2012 at 9:48pm by sara*

**physics**

In an elastic collision, both kinetic energy and momentum are conserved. Let m1=mass of red superball=1 m2=mass of blue superball=4 v11=initial velocity of red ball=5 v12=final velocity of red ball v21=initial velocity of blue ball=0 v22=final velocity of blue ball For ...
*Friday, November 20, 2009 at 2:13pm by MathMate*

**Physics ~Work Kinetic Energy~**

1.)A ball (m 0.5 kg) starts from rest and has 300 J(joule) of work applied to it. a) what is the initial kinetic energy of the ball? b) what is the final kinetic of the ball? c) what is the final velocity of the ball? 2.)A boy is doing chin-up. If the boy does 450 N of work to...
*Wednesday, January 30, 2013 at 5:50pm by Isis*

**physics help ! **

a baseball pitcher throws a baseball with a speed of 38m/s. estimate the average acceleration of the ball during the throwing motion,. in throwing the baseball, the pitcher accelerates the ball through a displacement of about 3.5 m from behind the body to hthe point where it ...
*Sunday, April 15, 2012 at 4:34pm by JACK 33*

**Physics**

A rubber ball weighs 95 N a. what is the mass of the ball ? b.what is the acceleration of the ball if an upward force of 69N is applied
*Sunday, November 29, 2009 at 2:12am by Anonymous*

**Physics Part 1**

since it hit head-on, the balls travel in exactly opposite directions, or in the same direction. Aside from that, since the balls are of almost identical mass, do you really expect one of them to take off at 3 times the original speed? to conserve momentum, .17(2.4) = .17v + ....
*Saturday, November 9, 2013 at 7:27pm by Steve*

**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?
*Tuesday, May 29, 2012 at 7:28pm by Hannah*

**Physics**

A small ball rolls horizontally off the edge of a tabletop of height h. It strikes the floor a distance x horizontally away from the edge of the table. (Use any variable or symbol stated above along with the following as necessary: g.) (a) How long is the ball in the air? t...
*Monday, February 4, 2013 at 8:12pm by Rachel*

**Physics (quick check)**

A football is kicked at ground level with a speed of 20.8m/s at an angle of 23.3 degress to the horizontal. How much later, in seconds, does it hit the ground? Tf =(-20.8m/s x Sin 23.3)/-9.80m/s^2 =0.839s this doesn't sound right to me
*Thursday, October 1, 2009 at 4:42pm by Mo*

**Pre-Calculus**

Phil Dawson is a professional place kicker for the Cleveland Browns. On average, he kicks the ball at a 41 degree angle with an initial speed of 70 feet per second. For future reference, goal posts are 10 feet high in the NFL. a) Write parametric equations to model Dawson's ...
*Friday, February 28, 2014 at 8:56pm by Alexis*

**Pre-Calculus**

Phil Dawson is a professional place kicker for the Cleveland Browns. On average, he kicks the ball at a 41 degree angle and with an initial speed of 70 feet per second. For future reference, goal posts are 10 feet high in the NFL. a) Write parametric equations to model Dawson'...
*Monday, March 3, 2014 at 6:12pm by Alexis*

**Gravitation help..........thanks**

A projectile is shot directly away from Earth's surface. Neglect the rotation of Earth. (a) As a multiple of Earth's radius RE, what is the radial distance a projectile reaches if its initial speed is one-fifth of the escape speed from Earth? ____ times RE (b) As a multiple of...
*Sunday, January 14, 2007 at 9:46pm by Jessy*

**physics**

A tennis player standing 11.0 m from the net hits the ball at 3.34° above the horizontal. To clear the net, the ball must rise at least 0.320 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the racquet?
*Tuesday, February 9, 2010 at 7:32pm by mel*

**physics**

A tennis player standing 11.5 m from the net hits the ball at 2.60° above the horizontal. To clear the net, the ball must rise at least 0.252 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the racquet?
*Sunday, September 19, 2010 at 7:58pm by nate*

**projectile physics**

im a bit puzzled, please help me gain the sanity required for this confusion... suppose a ball is thrown from the top of a cliff, and i am supposed to get its final velocity; since when the ball reaches it maximum height, the vf which becomes the vi or initial velocity upon ...
*Thursday, May 5, 2011 at 6:33am by cheerie*

**physics**

To enter the main pool at an amusement part, a swimmer uses a water slide which has a vertical height of 2.65 m. Find her speed at the bottom of the slide if she starts with an initial speed of 0.950 m/s.
*Thursday, November 10, 2011 at 7:23pm by Jonathan*

**physics**

A ball is thrown vertically upward with a speed of +13.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...
*Thursday, September 15, 2011 at 10:47pm by ashley*

**physics**

A ball is thrown vertically upward with a speed of +10.0 m/s. (a) How high does it rise? m (b) How long does it take to reach its highest point? s (c) How long does the ball take to hit the ground after it reaches its highest point? s (d) What is its velocity when it returns ...
*Sunday, January 22, 2012 at 11:25pm by seanso*

**physics**

A ball is thrown vertically upward with a speed of +10.0 m/s. (a) How high does it rise? m (b) How long does it take to reach its highest point? s (c) How long does the ball take to hit the ground after it reaches its highest point? s (d) What is its velocity when it returns ...
*Monday, January 23, 2012 at 12:22am by seanso*

**physics**

A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? m (b) How long does it take to reach its highest point? s (c) How long does the ball take to hit the ground after it reaches its highest point? s (d) What is its velocity when it returns to...
*Thursday, August 30, 2012 at 12:30am by roger*

**Physics**

A ball is thrown vertically upward with a speed of 15.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...
*Friday, September 21, 2012 at 6:44pm by Kelly*

**Physics **

I'm super confused about how to approach this problem. Please help. A ball of Styrofoam (ρ = 100 kg/m3) is totally submerged in water. The ball has a mass of 300.0 g What is the volume of the ball? If a string holds the ball when it’s in the water, what’s the tension in ...
*Friday, January 17, 2014 at 1:03pm by Sandy *

**Physics**

HELP! I'm doing a webassign, and am completley lost on these problems. If you could help with any, that would be great. A crate weighing 9.40 103 N is pulled up a 36° incline by a force parallel to the plane. If the coefficient of kinetic friction between the crate and the ...
*Wednesday, September 22, 2010 at 5:14am by Tom*

**physics**

A ball is thrown at a rate of 25m/s. The ball travels 138 meters. How long does it take the ball from start to end?
*Monday, February 20, 2012 at 9:26pm by jorge*

**Physics**

A quarterback makes a pass, throwing the ball at 21 m/s and an angle of 60° above the horizontal. A) What is the maximum height of the ball in flight? B) How long does it take to complete the pass? C) How many yards (yd) does he manage to throw the ball? (1 yard = 0.9144 ...
*Sunday, September 16, 2012 at 5:33pm by Katharine*

**Physics**

A quarterback makes a pass, throwing the ball at 21 m/s and an angle of 60° above the horizontal. A) What is the maximum height of the ball in flight? B) How long does it take to complete the pass? C) How many yards (yd) does he manage to throw the ball? (1 yard = 0.9144 ...
*Sunday, September 16, 2012 at 5:33pm by Katharine*

**physics **

A shell fired from the ground with an initial speed of 1.70 x 10^3 m/s at an initial angle of 55 degrees to the horizontal. neglecting air resistance, find a) the shell's horizontal range b)the amount of time the shell is in motion.
*Saturday, November 6, 2010 at 8:22am by luke*

**physics**

Problem 21.10 A proton with an initial speed of 800000 m/s is brought to rest by an electric field. Part B - What was the potential difference that stopped the proton? = Part C - What was the initial kinetic energy of the proton, in electron volts?
*Wednesday, September 14, 2011 at 12:56pm by Paige*

**COLLEGE PHYSICS**

A rocket is launched at an angle of 60.0° above the horizontal with an initial speed of 99 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 32.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile.
*Friday, September 10, 2010 at 8:09pm by CARY*

**Physics**

Suppose you throw a 0.054-kg ball with a speed of 11.5 m/s and at an angle of 31.8° above the horizontal from a building 13.1 m high. (a) What will be its kinetic energy when it hits the ground? (b) What will be its speed when it hits the ground?
*Friday, June 1, 2012 at 10:11pm by James*

**Physics**

Suppose you throw a 0.058-kg ball with a speed of 11.0 m/s and at an angle of 31.5° above the horizontal from a building 12.3 m high. (a) What will be its kinetic energy when it hits the ground? (b) What will be its speed when it hits the ground?
*Wednesday, September 26, 2012 at 4:00pm by Ray*

**Physics**

A 1.5 kg ball strikes a wall with a velocity of 7.9 m/s to the left. The ball bounces off with a velocity of 6.7 m/s to the right. If the ball is in contact with the wall for 0.21 s, what is the constant force exerted on the ball by the wall?
*Thursday, December 8, 2011 at 7:13pm by Henry*

**Physics**

A 1.5 kg ball strikes a wall with a velocity of 7.9 m/s to the left. The ball bounces off with a velocity of 6.7 m/s to the right. If the ball is in contact with the wall for 0.21 s, what is the constant force exerted on the ball by the wall?
*Thursday, December 8, 2011 at 7:13pm by Henry*

**physics**

A 2.7 kg ball strikes a wall with a velocity of 7.8 m/s to the left. The ball bounces off with a velocity of 6.6 m/s to the right. If the ball is in contact with the wall for 0.19 s, what is the constant force exerted on the ball by the wall?
*Thursday, November 8, 2012 at 10:31pm by Brandon*

**Physics**

A 3.6 kg ball strikes a wall with a velocity of 9.3 m/s. The ball bounces off with a velocity of 7.9 m/s in the opposite direction. If the ball is in contact with the wall for 0.4 seconds, what is the constant force exerted on the ball by the wall?
*Monday, March 25, 2013 at 3:38pm by Sam*

**Physics**

A 1.7 kg ball strikes a wall with a velocity of 7.7 m/s to the left. The ball bounces off with a velocity of 6.5 m/s to the right. If the ball is in contact with the wall for 0.17 s, what is the constant force exerted on the ball by the wall?
*Monday, December 16, 2013 at 10:02pm by Anonymous*

**physics**

1. Calculate the frequency (Hz) and energy (eV) of green photons with wavelength of 555nm. Photon energy = hν, where ν = frequency in Hz and h = 6.626x10-34 joule-sec, the Planck’s constant. Keep in mind that: wavelengthxfrequency = speed. 2. Andy Ruddick can serve ...
*Sunday, March 1, 2009 at 2:44pm by JeFF*

**physics**

Calculate the maximum height using the initial speed, half-time, and angle. The initial speeed is 18m/s, half time is 1.8, and the angle is 75. And how is this written out to solve.
*Sunday, January 23, 2011 at 11:51am by Anonymous*

**physics**

A particle has an initial horizontal velocity of 2.9 m/s and an initial upward velocity of 4.5 m/s. It is then given a horizontal accelera- tion of 1.2 m/s2 and a downward acceleration of 1.2 m/s2. What is its speed after 4.9 s? Answer in units of m/s
*Thursday, October 25, 2012 at 7:09pm by Sonia*

**Physics w/ Calc**

A baseball approaches home plate at a speed of 43.0 m/s, moving horizontally just before being hit by a bat. The batter hits a pop-up such that after hitting the bat, the baseball is moving at 54.0 m/s straight up. The ball has a mass of 145 g and is in contact with the bat ...
*Sunday, October 16, 2011 at 8:08pm by Lauren*

**Physics**

A 2.7 kg ball strikes a wall with a velocity of 7.6 m/s to the left. The ball bounces oﬀ with a velocity of 5.2 m/s to the right. If the ball is in contact with the wall for 0.23 s, what is the constant force exerted on the ball by the wall? Answer in units of N
*Sunday, January 22, 2012 at 3:55pm by Angel*

**physics **

A 3.3 kg ball strikes a wall with a velocity of 8.4 m/s to the left. The ball bounces oﬀ with a velocity of 6.8 m/s to the right. If the ball is in contact with the wall for 0.27 s, what is the constant force exerted on the ball by the wall? Answer in units of N
*Sunday, February 23, 2014 at 9:13pm by michael*

**statistics**

Downs and Abwender (2002) found neurological deficits in soccer players who are routinely hit on the head with soccer balls compared to swimmers, who are also athletes but who are not regularly hit in the head. Is this an example of an experimental or a non-experimental study...
*Wednesday, June 22, 2011 at 12:43am by Liz *

**Physics**

A ball is rolled off a table that is 0.481 m above the floor. The ball is rolling with a velocity if 1.8 m/s as it goes off the edge of the table. At the exact instant the first ball rolls off the table a second ball is dropped from the same height. A.) How long does it take ...
*Monday, July 22, 2013 at 8:20pm by Jason*

**physics**

A billiard ball rolling across a table to the right at 2.2 m/s makes a head-on elastic collision with an identical ball. The mass of a billiard ball is 32 g. If the second ball is initially at rest, what is the velocity of the first ball after the collision? If the second ball...
*Tuesday, February 22, 2011 at 1:28pm by micha*

**physics**

A billiard ball rolling across a table to the right at 2.2 m/s makes a head-on elastic collision with an identical ball. The mass of a billiard ball is 36 g. If the second ball is initially at rest, what is the velocity of the first ball after the collision? If the second ball...
*Wednesday, October 12, 2011 at 1:07am by sidney*

**child developement**

A child throws a ball with speed and accuracy when he throws a ball to his teacher but his throws are slower and less accurate when plays with a group of friends. This difference is explained by A. classical stage theory B. probility theory C. locomotion-x theory D, Piaget,s ...
*Saturday, April 28, 2012 at 4:57pm by jane*

**The defects of ball mill**

The Ball Mill faults: (1) work efficiency is low, the power consumption unit. (2) the ball mill barrel rotational speed is low (about 15 ~ 27 r/min), if you use ordinary motor that. The average all need equipped with expensive reducer. (3) grinding medium in the impact and ...
*Thursday, August 30, 2012 at 9:36pm by jiandan*

**physics**

The initial vertical component of the velocity is: Vyo = (35.5m/s)(sin49.9) = _____ m/s The vertical distance can be described by: y = (Vyo)t + (1/2)(-9.8m/s^2)t^2 At the time the ball was caught: 0.877m = (Vyo)t + (1/2)(-9.8m/s^2)t^2 Substitute the value for Vyo and rearrange...
*Friday, September 12, 2008 at 8:19pm by GK*

**Physics**

A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 27 m high. When it hits the ground at the base of the cliff the rock has a speed of 24 m/s. (a) Assuming that air resistance can be ignored, find the initial speed of the rock. (b) Find the greatest ...
*Monday, March 29, 2010 at 8:03pm by Carden*

**Physics**

Hillary kicks a ball so that it is in the air for 3.2 s. The ball lands down field 56 m from its starting point. a. Determine the x and y velocities of the ball.
*Sunday, October 10, 2010 at 10:47am by katelyn*

**Physics**

A ball rolls down a hill with a constant acceleration of 2.0 m/s2. If the ball starts from rest, (a) what is its velocity and the end of 4.0 s? (b) How far did the ball move?
*Monday, September 26, 2011 at 10:53pm by Me*

**Physics**

A ball rolls down a hill with a constant acceleration of 2.0 m/s2. If the ball starts from rest, (a) what is its velocity and the end of 4.0 s? (b) How far did the ball move?
*Monday, September 26, 2011 at 10:56pm by Me*

**physics**

A baseball player throws a ball. While the 700.0-g ball is in the pitchers hand, there os a force of 125N in it. What is the accerleration of the ball?
*Wednesday, December 14, 2011 at 2:27pm by Amber*

**physics**

If the mass of ball A is 5kg and ball B is 75kg, how high should ball B be dropped from so that when B collides with A they stick together and travel to point X?
*Thursday, January 19, 2012 at 11:46am by Andy*

**physics**

A baseball pitcher throws a ball with a maximum speed of 150. km/h. If the ball is thrown horizontally, how far does it fall vertically by the time it reaches the catcher's glove 20. m away? Give your answer numerically in meters using decimal notation (omit the units). Use ...
*Saturday, September 19, 2009 at 6:42pm by Michael*

**Physics**

Problem 21.10 A proton with an initial speed of 800000 m/s2 is brought to rest by an electric field. Part B - What was the potential difference that stopped the proton? Part C - What was the initial kinetic energy of the proton, in electron volts?
*Friday, September 9, 2011 at 5:50pm by Paige*

**Calculus**

If a ball is thrown straight up into the air with an initial velocity of 95 ft/s, its height in feet after t seconds is given by f(t)=95t−16t^2 Find the average velocity for the time period beginning when t=1 and lasting (i) 0.5 seconds (ii) 0.1 seconds (iii) 0.01 ...
*Friday, May 31, 2013 at 12:53am by Abby*

**algebra 2 homework check**

Ruth is scheduling a soccer tournament in which 64 teams will participate. After each round of soccer games, half the teams advance to the next round of the tournament. After all the rounds are played, how many total games are in the tournament? Is it 48?
*Saturday, May 19, 2012 at 11:27pm by Anonymous*

**algebra 2 homework check**

Ruth is scheduling a soccer tournament in which 64 teams will participate. After each round of soccer games, half the teams advance to the next round of the tournament. After all the rounds are played, how many total games are in the tournament? Is it 48?
*Saturday, May 19, 2012 at 11:27pm by Anonymous*

**physics**

A football is thrown from the edge of a cliff from a height of 22 m at a velocity of 18 m/s [39degrees above the horizontal]. A player at the bottom of the cliff is 12 m away from the base of the cliff and runs at a maximum speed of 6.0 m/s to catch the ball. Is it possible ...
*Sunday, February 23, 2014 at 8:39pm by Louis*

**science**

A small ball with a mass of 30.0 g and a charge of −0.200 μC is suspended from the ceiling by a string. The ball hangs at a distance of 5.00 cm above an insulating floor. If a second small ball with a mass of 50.0 g and a charge of 0.400 μC is rolled directly ...
*Monday, September 17, 2012 at 1:39pm by alia*

**physics**

A small ball with a mass of 30.0 g and a charge of −0.200 μC is suspended from the ceiling by a string. The ball hangs at a distance of 5.00 cm above an insulating floor. If a second small ball with a mass of 50.0 g and a charge of 0.400 μC is rolled directly ...
*Monday, September 17, 2012 at 2:32pm by alia*

**Science Physics**

A rubber ball of mass m1= 10kg is moving to the right with speed v1= 10m/s. it collides elastically with another ball of mass m2= 50kg, which is sitting at rest. m2 is larger than m1, what are the speeds of the balls, v1 and v2 after the collision?
*Thursday, February 3, 2011 at 9:29pm by Alan*

**physics**

three dimensional identical balls 1,2 and 3 are placed on a straight line at a separation of 10m between balls . initially they are at rest. ball 1 is given a velocity of 10m/s towards ball 2. collision between ball 1 and 2 is inelastic with e=0.5 . but collision between ball ...
*Sunday, January 16, 2011 at 7:49am by sreeram*

**physics**

three dimensional identical balls 1,2 and 3 are placed on a straight line at a separation of 10m between balls . initially they are at rest. ball 1 is given a velocity of 10m/s towards ball 2. collision between ball 1 and 2 is inelastic with e=0.5 . but collision between ball ...
*Sunday, January 16, 2011 at 8:43pm by mackson*

**Physics**

I just want to be sure if my answers make any sense! A kid throws a ball in the air and catches it 5 seconds later a) What is the initial velocity of the ball? No air friction. b) What is the maximum height which the ball has reached above its departure point? c) If this kid ...
*Friday, November 18, 2011 at 2:43pm by Tommy*

**physics**

A 0.50 kg ball that is tied to the end of a 1.4 m light cord is revolved in a horizontal plane with the cord making a 30° angle with the vertical. (b) If the ball is revolved so that its speed is 4.0 m/s, what angle does the cord make with the vertical?
*Monday, December 6, 2010 at 9:21pm by kaitlyn*

**physics**

A 0.50 kg ball that is tied to the end of a 1.4 m light cord is revolved in a horizontal plane with the cord making a 30° angle with the vertical. (b) If the ball is revolved so that its speed is 4.0 m/s, what angle does the cord make with the vertical?
*Monday, December 6, 2010 at 9:23pm by kaitlyn*

**The defects of ball mill**

The Ball Mill faults: (1) work efficiency is low, the power consumption unit. (2) the ball mill barrel rotational speed is low (about 15 ~ 27 r/min), if you use ordinary motor that. The average all need equipped with expensive reducer. (3) grinding medium in the impact and ...
*Thursday, June 13, 2013 at 4:55am by selina*

**SCIENCE**

When you drop a bowling ball & a tennis ball they hit the floor at the same time but when they hit the floor they have the same what? A. speed B. force C. momentum D. all of the above. I think it is D but I can't find anywhere what they have the same. Thanks
*Friday, September 7, 2012 at 9:33pm by SUE*

**English**

1. Our team practiced soccer every day. 2. Our team practiced the soccer every day. (Which one is OK? Are both grammatical? Do we have to eliminate 'the'?)
*Thursday, December 9, 2010 at 9:01pm by rfvv*

**physics**

Assume: 1. no air resistance 2. initial speed (Vi) = "average speed" = 6000 mph Change in vertical altitude after time t =Vi*sin(θ)t - (1/2)gt² Vi = initial velocity = 6000 mph = 8800 ft/s t=time since launch = 120 s. θ=launch angle above horizontal = 26.5°...
*Saturday, June 23, 2012 at 10:30pm by MathMate*

**Physics 141**

speed of rock = 15.5 , mass = .32 speed of wagon = v , mass = 92.7 initial momentum = 93 * .52 = 48.4 final momentum = initial momentum so 48.4 = .32*15.5 + 92.7*v solve for v if backward 48.4 = -.32*15.5 + 92.7*v
*Tuesday, March 11, 2014 at 9:51pm by Damon*

**Math**

a special rubber ball is dropped from the top of a wall that is 64 feet high. each time the ball bounces it rises half as high as the distance it fell. The ball is caught when it bounces 1foot high. how many times did the ball bounce?
*Monday, February 20, 2012 at 12:33pm by Jewell*

**Physics**

A thing rod of length L and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass 5.00kg is attached to the other end. The rod is pulled aside through an angle 30.0 degrees and released. What is the speed of the ball at the lowest ...
*Thursday, December 9, 2010 at 3:01pm by Andrea*

**physics**

when babe ruth hit a homer over the 7.5-m-high right field fence 95 m from home plate, roughly what wa the minimum speed of the ball when it left the bat? Assume the ball wa hit 1.0 m above the ground and it path initially made a 38 degree angle with the ground.
*Thursday, January 5, 2012 at 4:50pm by taylor*

**Physics Circular Motion**

A 0.40-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 2.0 m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 75 N, what is the maximum speed the ball can have? May someone please walk me through ...
*Saturday, June 16, 2012 at 5:13pm by Mike Joseph*

**Physics**

A shell is fired from the ground with an initial speed of 1.72 103 m/s at an initial angle of 40° to the horizontal. a) Neglecting air resistance find the horizontal range b) Find the amount of time the shell is in motion
*Wednesday, November 14, 2012 at 8:03pm by Jacob*

**Math**

Jim has a difficult golf shot to make. His ball is 100m from the hole. He wants the ball to land 5m in front of the hole, so it can role to the hole. A 20m tree is between his ball and the hole, 40m from the hole and 60m from Jim's ball. With the base of the tree as the origin...
*Sunday, October 18, 2009 at 5:47pm by Samantha*

**physics**

the coefficient of restitution between the ball and the floor is 0.60 If the ball is drop from rest at the height of 6.6 m from the floor. Find a) what is the maximum height will the ball attain after the first bounce. b) how much kinetic energy is lost duirng the impact if ...
*Monday, February 21, 2011 at 7:25am by robert*

**kvb**

Sam hits a golf ball with a five-iron a distance of 120 m horizontally. A tree 45 m high and 35 m in front of Sam is directly in the path of the ball. Will the ball clear the tree if the ball makes a parabolic curve and has maximum height of 80 m?
*Tuesday, October 11, 2011 at 7:56am by veera*

**Physics - Mechanics and Ocsillatory Motion**

The force shown in the figure acts on a 1.7-kg object whose initial speed is 0.44 m/s and initial position is x = 0.27 m. the figure can be found at: [[webassign dot net forwardslash walker forwardslash 07-16 dot gif]] (a) Find the speed of the object when it is at the ...
*Saturday, October 30, 2010 at 6:42pm by Sara*

**Physic**

Me and my friend are playing on a Ferris wheel which has Radius of 20 Meter and had an constant angular velocity of 0.2 rad/s . Then, When I'm at the very top of the Ferris wheel i'm going to drop a tennis ball( dropping without initial velocity). How far around the Ferris ...
*Saturday, June 15, 2013 at 1:44pm by Dave*

**physics**

A 1.4-kg copper block is given an initial speed of 2.0 m/s on a rough horizontal surface. Because of friction, the block finally comes to rest. (a) If the block absorbs 85% of its initial kinetic energy as internal energy, calculate its increase in temperature.
*Wednesday, April 11, 2012 at 9:56pm by Anonymous*

**Physics**

A ball is rolling on a track with an intial velocity of 2.0m/s, E. If the acceleration is 1.5 m/s2, write a sentence that describes the ball's motion, i.e, what does the ball do each second?
*Thursday, September 30, 2010 at 5:56pm by Jane*

**Physics**

A golf ball is hit with a velocity of 24.5 m/s at 35.0 degrees above the horizontal. Find a) the range of the ball, and b) the maximum height of the ball
*Monday, October 10, 2011 at 9:09pm by Joy*

**physics**

If the green ball bounces upward from the ground with a speed of 20 m/s (immediately after it hit the ground), calculate the momentum of the ball as it goes upward immediately after hitting the ground
*Tuesday, September 28, 2010 at 6:07pm by becky*

**Physics**

A neutral ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. Why is this? 1. The ball becomes negatively charged by induction. 2. The string is not a perfect conductor. 3. The number of ...
*Tuesday, July 23, 2013 at 2:00pm by Lynn*

**Trig. **

A preseason game Tennessee Titans punter A.J. Trapasso hit the giant HD TV screen suspended above the field at the new Cowboys stadium. At the time of the punt A.J. was 30 yards away from the edge of the tv screen (the tv screen starts at the 40 yard line, and AJ was at the 10...
*Saturday, January 23, 2010 at 12:00pm by Anonymous*

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