Thursday

April 17, 2014

April 17, 2014

Number of results: 24,541

**physics**

If you are in a smooth riding bus that is going 50 km/hr and you flip a coin vertically, what is the horizontal velocity of the coin in midair relative to the ground?
*Saturday, August 14, 2010 at 7:28pm by Anonymous*

**Statistics**

The time required to make 900 gallons of synthetic rubber at a plant in South America in a recent year was normally distributed with a mean of 15 hours and a standard deviation of 2.5 hours. What is the probability that it will take more than 17 hours to make 900 gallons of ...
*Friday, February 25, 2011 at 6:37pm by Clyde*

**physics**

According to the Guinness Book of World Records, the longest home run ever measured was hit by Roy Dizzy Carlyle in a minor league game. The ball traveled 188 {\rm m} (618 {\rm ft}) before landing on the ground outside the ballpark part a Assuming the ball's initial velocity...
*Friday, June 14, 2013 at 2:09am by Bob*

**Physics**

A ball rolls off a 3.5 m high box with a velocity of 4m/s. How long does it take to reach the floor and how far from the box does it land?
*Sunday, January 9, 2011 at 4:37pm by Mary*

**IPC (different one)**

Select all that apply. A 0.200-kilogram ball sits on a shelf 2.00 meters from the floor and then falls to a point 1.00 meter from the floor. Ignoring any affects due to friction, at this position _____. 1) its mechanical energy is 3.92 J 2) its potential energy is 3.92 J 3) ...
*Monday, January 3, 2011 at 11:30am by Prue*

**physics**

A 0.01-kg baseball traveling in a horizontal direction with a speed of 12 m/s hits a bat and is popped straight up with a speed of 15 m/s. (a) What is the change in momentum (magnitude and direction) of the baseball? (b) If the bat was in contact with the ball for 26 ms, what ...
*Tuesday, November 9, 2010 at 10:45am by tim*

**Physics**

A cue ball (mass = 0.150 kg) is at rest on a frictionless pool table. The ball is hit dead center by a pool stick which applies an impulse of +1.45 Ns to the ball. The ball then slides along the table and makes an elastic head-on collision with a second ball of equal mass ...
*Sunday, October 24, 2010 at 4:48pm by Xavier*

**physics**

A cue ball (mass = 0.140 kg) is at rest on a frictionless pool table. The ball is hit dead center by a pool stick which applies an impulse of +1.60 Ns to the ball. The ball then slides along the table and makes an elastic head-on collision with a second ball of equal mass ...
*Wednesday, December 7, 2011 at 8:34pm by Anonymous*

**Calculus - Dot Product**

A crate is dragged 3m along a smooth level floor by a 30n force applied at 25deg to the floor. Then it is pulled 4m up a ramp inclined at 20deg to the horizontal, using the same force. Then, the crate is dragged a further 5m along a level platform using the same force. ...
*Monday, August 9, 2010 at 11:35am by Shaila*

**pre calc**

the graph of y=-1/2 x+5 +3 can be obtained from the graph of y= x by which transformations what is the horizontal shift by what factor is the graph stretched or shrunk vertically and how is it reflected
*Tuesday, September 11, 2012 at 11:54pm by si*

**Physics**

A cart loaded with bricks has a total mass of 28.5 kg and is pulled at constant speed by a rope. The rope is inclined at 28.1 ◦ above the horizontal and the cart moves 13.9 m on a horizontal floor. The coefficient of kinetic friction between ground and cart is 0.4 . The ...
*Tuesday, November 9, 2010 at 10:05pm by Shakib*

**math**

a. The sales representative informs you that there is a total of 96 houses for sale. Of these 96, some have one floor plan while the others have a different floor plan. Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the ...
*Tuesday, March 29, 2011 at 11:59pm by valerie*

**math**

a. The sales representative informs you that there is a total of 96 houses for sale. Of these 96, some have one floor plan while the others have a different floor plan. Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the ...
*Tuesday, March 29, 2011 at 11:59pm by valerie*

**Physics**

a. V^2 = Vo^2 + 2g*h. V^2 = 0 + 19.6*1.8 = 35.28 V = 5.94 m/s. b. V^2 = Vo^2 + 2g*d. V^2 = 0 + 19.6*1m = 19.6 V = 4.43 m/s. = Velocity with which it hits gnd. after it bounces. = Velocity with which it leaves gnd after it bounces.
*Monday, October 15, 2012 at 5:02pm by Henry*

**physics**

A 0.700-kg ball is on the end of a rope that is 2.20 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0 with respect to the vertical as shown. What is the ...
*Tuesday, May 22, 2012 at 6:32pm by Adam*

**physics**

A 0.700-kg ball is on the end of a rope that is 2.20 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0 with respect to the vertical as shown. What is the ...
*Tuesday, May 22, 2012 at 10:34pm by Adam*

**physics**

A man drags a 71.5-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The crate is tilted 24.5 above the horizontal, and the strap is inclined 63.0 above the horizontal. The center of gravity of the crate coincides ...
*Thursday, March 21, 2013 at 4:24pm by A*

**Physics**

A man drags a 71.5-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The crate is tilted 24.5 above the horizontal, and the strap is inclined 63.0 above the horizontal. The center of gravity of the crate coincides ...
*Thursday, March 21, 2013 at 4:36pm by A*

**physics**

A ball has a mass of 0.14 kg and is pitched w/ velocity of 38 m/s. The batter hits the ball & departs w/ a velocity of 58 m/s. Contact time b/w the bat and ball is 4.0 x 10-3seconds. What is avg force exerted on ball?
*Saturday, December 11, 2010 at 12:45pm by jennifer*

**Physics**

A stone is dropped into a deep well and is heard to hit the water 2.95 s after being dropped. Determine the depth of the well.
*Friday, October 8, 2010 at 8:59am by Eli*

**English**

3. Robert announced that he was dropped out of college. (Thank you for your help. Is this sentence right in grammar? What other expressions can we use instead of 'dropped'?)
*Thursday, July 19, 2012 at 4:23pm by rfvv*

**Physics**

Two boys standing on carts that move along a horizontal frictionless surface. The mass of each boy-cart combination is 100 kg, and each moves initially with the velocities of: Boy A 7cm/sec and Boy B: 10cm/sec. The boy on cart A throws a 2kg ball to the boy on Cart B (assume ...
*Thursday, April 11, 2013 at 5:56pm by Danisha*

**physics**

A tennis ball of 60g is dropped from a height of 2.0m,It rebounds but loses 25% of its kintic energy as thermal energy.Ignoring air resistance,calculate
*Wednesday, April 6, 2011 at 7:06am by Physics,help.*

**physics**

suppose a ball thrown downward with initial velocity 3 m/s instead of being dropped a)what then would be its position after 1s and 2s ? b)what would its speed be after 1 s and 2 s ?
*Saturday, November 19, 2011 at 1:17pm by nour*

**physics**

A box is pushed without acceleration 9.0m along a horizontal floor against a frictional force of 100N. How much work is done?
*Tuesday, August 24, 2010 at 11:48pm by nahum*

**physics**

a block with a velocity 4m/s slides 8m across a rough horizontal floor before coming to rest.the coefficient of friction is.
*Monday, January 27, 2014 at 1:23pm by kelly*

**Physics**

Are you supposed to estimate aerodynamic drag? When dropped from that that altitude, it will definitely not be negligible. Both the horizontal and vertical drag will be appreciable. I would complain to the teacher
*Friday, December 3, 2010 at 11:14pm by drwls*

**algebra**

a single ball is drawn from an urn containing 4 balls numbered 1 through 4. find the probability that the ball chosen is as follows: an even numbered ball or an odd numbered ball
*Friday, July 5, 2013 at 9:30pm by Sandi*

**physics**

The force of friction between a crate and the floor it is sliding over depends on? a. the speed the crate is moving over the floor with b. the surface area of the crate in contact with the floor c. how much force you are exerting on the crate parallel to the crate's motion d. ...
*Friday, November 2, 2012 at 3:34pm by ashley*

**physics**

A soccer ball with mass 0.410 kg is initially moving with speed 4.30 m/s. A soccer player kicks the ball, exerting a constant force of magnitude 44.0 N in the same direction as the ball's motion. Over what distance must the player's foot be in contact with the ball to increase...
*Wednesday, February 25, 2009 at 8:07pm by nikki*

**Physics**

A crate (weight 381 N) is lowered vertically a distance of 3.0 m by two ropes at a constant speed of 1.2 m/s. The tension in rope A is TA = 248 N; the rope makes an angle of A = 63 with the horizontal. Rope B makes an angle of B = 55 with the horizontal. What is the ...
*Saturday, October 27, 2007 at 7:01pm by Monica*

**Math**

A person standing close to the edge on the top of a 160-foot building throws a baseball vertically upward. The quadratic function s(t) = -16t^2 +64t + 160 models the ball's height above the ground, s(t), in feet, t seconds after it was thrown. After how many seconds does the ...
*Tuesday, October 18, 2011 at 2:43pm by Nicole *

**Pre-Calculus**

74. Road Grade When driving down a mountain road, you notice warning signs indicating that it is a "12% grade." This means that the slope of the road is -12/100. Approximate the amount of horizontal change in your position if you note from elevation markers that you have ...
*Thursday, February 3, 2011 at 4:48pm by Sam*

**general physics**

The height of the ball is y = x tanθ - g/2(v cosθ)^2 x^2 so, we have y = 1.19x - .0527x^2 Now, we want x when y=2.10 1.19x - .0527x^2 = 2.10 x = 20.651 Now, since the ball's horizontal speed is 15 cosθ = 9.642 m/s, that means that it takes 2.14 seconds for the ...
*Thursday, July 25, 2013 at 7:06pm by Steve*

**Physics (Rotational Kinetic Energy)**

Hello, The question is: A solid ball rolls along the floor with a constant linear speed v. Find the fraction of its total kinetic energy that is in the form of rotational kinetic energy about the center of the ball. Krot/Ktotal = ? The answer I keep getting is 3/1, but the ...
*Wednesday, October 21, 2009 at 9:29pm by Ben*

**physics**

1. A baseball rolls off a 0.80 m high desk and strikes the floor 0.25 m away from the base of the desk. How fast was the ball rolling?
*Wednesday, August 31, 2011 at 8:22pm by viyanah*

**Physics**

A 50g tennis ball is thrown with a velocity of 12 m/s. It strikes a wall and rebounds with a velocity of 10 m/s. a) What is the ball's initial and final momentum? b) what is the impulse on the ball? c) Thje ball is in contact with the wall for .10 second. with what force did ...
*Monday, April 15, 2013 at 3:46pm by Jack*

**physical science**

19. (2 points) Ball 2, with a mass of 30kg, is moving to the left at 10m/s. With what velocity should Ball 1, with a mass of 10kg, move to the right and collide with Ball 2, so that Ball 1 rebounds with a velocity of 30m/s, and Ball 2 with a velocity of 10 m/s, after the ...
*Thursday, February 13, 2014 at 8:33pm by anonymous *

**phyics**

i need help setting it up to find the answers. (answers included) two masses are connected together by a string which is then hung over a pulley. m1= 7.50 kg and m2= 6.50 kg. before they are released m1 is suspended h= 135cm above the floor while m2 is sitting on the floor. a....
*Monday, November 1, 2010 at 11:04pm by danielle*

**Physics**

a ball is thrown vertically upward from the ground with the velocity of 30m/s. a) how long will it take to rise to its highest poitn? b) how high does the ball rise? c) how long after projection will the ball have a velocity of 10m/s? d) what is the total time of flight? From ...
*Monday, July 19, 2010 at 7:22am by tchrwill*

**Science**

Fred and Joe are moving identical boxes across a floor where there is friction present. Fred pushes his box with a force that is directed 20 degrees below the horizontal, while Joe pulls his box using a rope that is angled 20 degrees above horizontal. Who must use the greater ...
*Wednesday, September 15, 2010 at 3:33pm by Cassy*

**physics**

jane hits a golf ball on a flat fairway. The ball leaves the ground at a 14.5 degree angle and lands 193 meters away. How long was the ball in the air? How fast was the ball moving when it left the ground?
*Thursday, September 25, 2008 at 7:31pm by shan*

**Physics**

A woman, driving a golf ball off a tee, gives the ball a velocity of 28.0 m/s. The mass of the ball is 0.045 kg, and the duration of the impact with the golf club is 6 x 10-3 s. 3a. What is the change in momentum of the ball
*Tuesday, April 13, 2010 at 8:37am by Arnold Manguy*

**physics**

Candace threw a 0.09 kg ball at an angle such that the downwards initial velocity is 15.00 m/s and the horizontal initial velocity is 18.00 m/s. What is in m/s the vertical component of the velocity of the ball 0.20 seconds after she threw it? (Do not include units in your ...
*Wednesday, September 28, 2011 at 7:28pm by Elisabeth*

**MATH HELP!**

Help with any of these would be greatly appreciated! THANK YOU! 2. How would i determine the values of 'k' if the graph y=2x^2-2x+3k intersects the x-axis at two distinct points? 3. The path of a basketball can be modeled by the equation h(d)=-0.13d^2+d+2. where h(d) is the ...
*Thursday, July 24, 2008 at 12:36am by Rachel*

**math**

Concrete can be purchased by the cubic yard. How much will it cost to pour a slab that is 17 ft by 17 ft by 2 ft if the concrete costs $40.00 per cubic yard?
*Sunday, December 17, 2006 at 5:28pm by travis*

**Calculus (Vector-Valued Functions)**

Good grief, feet and pounds? Well, just for now g = 32 ft/s^2 The horizontal speed is 50 feet/seconds until the ball hits the ground since there are no horizontal components of force. 256 = (1/2) g t^2 = 16 t^2 t = 4 seconds d = u t = 50 * 4 = 200 feet
*Friday, January 27, 2012 at 10:13pm by Damon*

**physics**

2. A horizontal force of 100 N is required to push a piece of furniture across a floor at a constant velocity. (a) What is the net force acting on the furniture? (b) How much is the friction force that acts on the sliding furniture? (c) How much friction acts on the ...
*Tuesday, August 10, 2010 at 2:11pm by Anonymous*

**Physics**

A 19 kg wooden crate is dragged across the driveway. The coefficient of kinetic friction between the wood and concrete is 0.64. A. What is the horizontal force needed to drag the crate uniformly? B. Give a possible value for the coefficient of state friction.
*Tuesday, November 24, 2009 at 10:21am by Jessica*

**Pre-calculus**

A golf ball is hit with an initial velocity of 135 feet per second at an angle of 22 degrees above the horizontal. Will the ball clear a 25 foot wide sand trap whose nearest edge is 300 feet from the golfer? Will be through with all the word problems soon. I have managed to ...
*Sunday, October 19, 2008 at 11:16am by Lucy*

**physics**

A horizontal force of 100 N is required to push a piece of furniture across a floor at a constant velocity. what is the net force acting on the furniture? How much is the friction force that acts on the sliding furniture? How much friction acts on the furniture when it is at ...
*Tuesday, September 21, 2010 at 6:20pm by m*

**physics help!!!**

particle 1 of mass m1 = 0.29 kg slides rightward along an x axis on a frictionless floor with a speed of 1.8 m/s. When it reaches x = 0, it undergoes a one-dimensional elastic collision with stationary particle 2 of mass m2 = 0.40 kg. When particle 2 then reaches a wall at xw...
*Saturday, March 27, 2010 at 1:07pm by beav*

**Physics**

A man drags a 71.5-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The crate is tilted 27.0 above the horizontal, and the strap is inclined 66.5 above the horizontal. The center of gravity of the crate coincides ...
*Monday, October 29, 2012 at 12:22pm by Sam*

**General Science**

Get a strong rubber band. Hold it between your two hands. Now have someone pluck it. Stretch and repeat the pull. Which frequency is higher. Repeat with a shorter portion of the rubber band. Then you can answers this question. The idea in this type question is to make you ...
*Tuesday, May 19, 2009 at 11:26am by DrBob222*

**physics**

a ball roles off a horizontal table at 0.30 m/s and strikes the ground 0.15m horizontally from the base of the table. (a) how high is the table (b) if another ball roles off the same table at 0.60 m/s how far from the base of the table does it hit.
*Saturday, February 9, 2013 at 5:39pm by zeinab*

**physics**

a ball roles off a horizontal table at 0.30 m/s and strikes the ground 0.15m horizontally from the base of the table. (a) how high is the table (b) if another ball roles off the same table at 0.60 m/s how far from the base of the table does it hit.
*Saturday, February 9, 2013 at 5:43pm by zeinab*

**11th grade**

A flight attendant pulls her 70.0 N flight bag a distance of 263 m along a level airport floor at a constant speed. The force she exerts is 41.0 N at an angle of 52.0 above the horizontal. (a) Find the work she does on the flight bag. (b) Find the work done by the force of ...
*Thursday, April 15, 2010 at 2:51pm by brittany*

**Physics- Work**

A worker pushes a 1.50*10^3 N crate with a horizontal force of 345 N a distance of 24.0 m. Assume the coefficient of kinetic friction between the crate and the floor is 0.220. a. How much work is done by the worker on the crate? b. How much work is done by the floor on the ...
*Wednesday, October 27, 2010 at 11:31pm by Pablo*

**Physics**

A bowling ball rolls without slipping up a ramp that slopes upward at an angle (beta) to the horizontal. Treat the ball as a uniform, solid sphere, ignoring the finger holes. What is the acceleration of the center of mass of the ball? Express your answer in terms of the ...
*Tuesday, April 3, 2012 at 6:34pm by Joe*

**physics**

a .140 kg baseball is dropped from rest from a height of 2.2m above the ground. it rebounds to a height of 1.6 m. what change in the balls momentum occurs when the ball hits the ground?
*Tuesday, February 22, 2011 at 12:10pm by vicki *

**physics**

a .140 kg baseball is dropped from rest from a height of 2.2m above the ground. it rebounds to a height of 1.6 m. what change in the balls momentum occurs when the ball hits the ground
*Wednesday, February 23, 2011 at 7:36am by vicki *

**Physics**

WOMAN IN ELEVATOR A woman weighs Fg= 650 N when standing on a stationary scale. Now, the woman is riding an elevator from the 1st floor to the 10th floor. As the elevator approaches the 10th floor, it decreases its upward speed from 8 m/s to 1 m/s in a time interval of 1 s. ...
*Saturday, November 2, 2013 at 12:42pm by Mary*

**Physics**

the velocity when the ball first contacts the floor is: V1 = sqrt(2*g*s) V1= sqrt(2 * 9.8(m/s^s) * 1.8m) The velocity when the ball just leaves (rebounds) works the same way except for the distance sign V2 = sqrt(2 * 9.8(m/s^2) * (-1.06m)) V1 - V2= delta V (you will be ...
*Thursday, October 4, 2007 at 6:47pm by Quidditch*

**Physics**

compression distance = (column length)*strain Strain = Stress/(Young's modulus) Stress = (load)/(area) = M*g/[(pi/4)D^2] Look up Young's modulus for concrete and do the numbers. The modulus might be dfferrnt if the concrete is reinforced with steel, as most is.
*Sunday, April 10, 2011 at 3:49pm by drwls*

**Pre calc**

Alice throws a ball straight up with an initial speed of 40 feet per second from a height of 5 feet? a) Find parametric equations that model the motion of the ball as a function of time. b) How long is the ball in the air? c) When is the ball at its maximum height? Determine ...
*Monday, May 6, 2013 at 9:07pm by Rebekah*

**Pre Calc**

Alice throws a ball straight up with an initial speed of 40 feet per second from a height of 5 feet? a) Find parametric equations that model the motion of the ball as a function of time. b) How long is the ball in the air? c) When is the ball at its maximum height? Determine ...
*Tuesday, May 7, 2013 at 7:01am by Rebekah*

**Physics(Please respond)**

A golfer hits a shot to a green that is elevated 3.0 m above the point where the ball is struck. The ball leaves the club at a speed of 17.4 m/s at an angle of 35.0 above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air resistance...
*Monday, May 28, 2012 at 1:40pm by Hannah*

**Physics(Please respond)**

A golfer hits a shot to a green that is elevated 3.0 m above the point where the ball is struck. The ball leaves the club at a speed of 17.4 m/s at an angle of 35.0 above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air resistance...
*Monday, May 28, 2012 at 8:07pm by Hannah*

**Physics**

A warehouse employee used a cable to pull a 125 kg crate across the floor. the angle between the cable and the floor was 25. The magnitude of the pulling force was 185 N. The coefficient of kinetic friction between the crate and the floor was 0.27. A)What was the weight of ...
*Tuesday, November 27, 2012 at 3:57pm by Kevin*

**Need direction**

Was the ball thrown up, down, at an angle from horizontal?
*Sunday, July 10, 2011 at 1:40pm by Damon*

**Physics**

Write an ideal (zero resistance) equation for vertical height vs time and compute the time and location where the ball lands (Z = 0). Compare that with the actual distance where it lands. Is that ball speed really miles per hour or meters per second? If it is mph, convert the ...
*Friday, September 10, 2010 at 3:11am by drwls*

**physics **

A 0.700-kg ball is on the end of a rope that is 2.20 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0 with respect to the vertical as shown. What is the ...
*Wednesday, May 23, 2012 at 11:45am by Adam*

**Creative Writing**

The description moves from the broad category of transportation to a concrete, detailed image. The underlined words show how the image moves from the broadest category to the concrete, detailed image.
*Tuesday, June 30, 2009 at 4:29pm by Fats*

**Physics**

In moving a 35.0 kg desk from one side of a classroom to the other, a professor finds that a horizontal force of 300 N is necessary to set the desk in motion, and a force of 185 N is necessary to keep it in motion at a constant speed. (a) What is the coefficient of static ...
*Wednesday, September 22, 2010 at 1:10am by Greg*

**physics**

A spring is resting vertically on a table. A small box is dropped onto the top of the spring and compresses it. Suppose the spring has a spring constant of 450 N/m and the box has a mass of 1.5 kg. The speed of the box just before it makes contact with the spring is 0.49 m/s...
*Sunday, June 19, 2011 at 10:23pm by Anonymous*

**Algebra**

A brick is dropped from the Empire State Building at a height of 324 meters. If you neglect any type of air resistance, what is the distance in meters that the ball falls during the interval between the 8th and 9th second?
*Sunday, September 21, 2008 at 4:08pm by Mary*

**college physics**

During a circus act, an elderly performer thrills the crowd by catching a cannon ball shot at him. The cannon ball has a mass of 10.0 kg and the horizontal component of its velocity is 8.00 m/s when the 65.0-kg performer catches it. If the performer is on nearly frictionless ...
*Monday, March 24, 2014 at 12:10am by Mohanad*

**Physics**

A place kicker must kick the football from a point 34.2 m from the goal and clear a bar 3.00 m above the ground. The ball leaves the ground with a speed of 20.0 m/s at an angle of 53.0 degrees above the horizontal. (a) By how much (m) does the ball clear (positive value) or ...
*Saturday, August 6, 2011 at 7:30am by waqas*

**Physics **

A woman weighs Fg= 600 N when standing on a stationary scale. Now, the woman is riding an elevator from the 1st floor to the 10th floor. As the elevator approaches the 10th floor, it decreases its upward speed from 7 m/s to 1 m/s in a time interval of 1 s. What is the average ...
*Saturday, November 2, 2013 at 12:09am by Phy*

**Math**

Suppose you drop a ball from the top of a five-story building onto the sidewalk 70 ft below. a. What is the initial velocity of the ball? b. Determine a function for the height of the ball t seconds after it's released. c. How long will the ball be in the air before it hits ...
*Tuesday, March 24, 2009 at 9:46am by SC*

**physics**

at a ball game consider a baseball of mass m=0.15 that falls directly downward at a speed v=40m/s into the hands of a fan. what impulseft must be supplied to bring the ball to rest? if the ball is stopped in 0.3s, what is the average force of the ball on the catchers hand?
*Thursday, October 15, 2009 at 7:52pm by saba*

**physics**

at a ball game consider a baseball of mass m=0.15 that falls directly downward at a speed v=40m/s into the hands of a fan. what impulseft must be supplied to bring the ball to rest? if the ball is stopped in 0.3s, what is the average force of the ball on the catchers hand?
*Thursday, October 15, 2009 at 7:55pm by Anonymous*

**physics**

at a ball game consider a baseball of mass m=0.15 that falls directly downward at a speed v=40m/s into the hands of a fan. what impulseft must be supplied to bring the ball to rest? if the ball is stopped in 0.3s, what is the average force of the ball on the catchers hand?
*Thursday, October 15, 2009 at 7:57pm by saba*

**math**

Suppose you drop a ball from the top of a five-story building onto the sidewalk 70 feet below. a. What is the initial velocity of the ball? b.Determine a function for the height of the ball t seconds after it's released. c. How long will the ball be in the air before it hits ...
*Wednesday, October 13, 2010 at 12:34am by Sally*

**PHYSICS!!!**

A 0.30-kg softball has a velocity of 12 m/s at an angle of 30 below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while it is in contact with the bat if the ball leaves the bat with a velocity of 17 m/s, ...
*Saturday, February 24, 2007 at 7:36pm by winterWX*

**physics.**

A 20.0 kg cannon ball is fired from a cannnon with muzzle speed of 1000 m/s at an angle of 37.0 with the horizontal. A second ball is fired at an angle of 90.0. Use the conservation of energy principle to find a] the maximum height reached by each ball and b] the total ...
*Thursday, March 15, 2007 at 5:38am by Jean*

**english**

True or False: To talk in an abstract manner is to use easily understandable, concrete terms. I think it is false? I think so, too. I think Writeteacher answered this below, but yes, I think it's false too. The words abstract and concrete are generally considered antonyms, so ...
*Wednesday, September 13, 2006 at 10:40pm by anonymous*

**Math( please help)**

a ball is kicked in the air from the top of a cliff. the path the ball travels is given by the equation h(t)=-5t^2+17t+22 where h(t) is the height in metres and t is the time in seconds a) what is the maximum height that the ball reaches b)when will the ball hit the ground
*Sunday, October 16, 2011 at 1:11am by Julie*

**Math( please help)**

a ball is kicked in the air from the top of a cliff. the path the ball travels is given by the equation h(t)=-5t^2+17t+22 where h(t) is the height in metres and t is the time in seconds a) what is the maximum height that the ball reaches b)when will the ball hit the ground
*Sunday, October 16, 2011 at 3:29pm by Julie*

**physics**

Divide the kinetic energy of the ball at release (1/2 m V^2)by the "time to swing" the ball. m = ball mass = (weight)/g V = (lane length)/(time to roll) There is some additional power associated with the bowler accelerating himself while swinging the ball.
*Sunday, March 24, 2013 at 5:02am by drwls*

**physics**

a woman weighs Fg=650 when standing on a stationary scale. The woman is riding an elevator from the 1st floor to the 10th floor. As the elevator approaches the 10th floor, it decreases its upward speed from 9 m/s to 1 m/s in a time interval of 1 second. What is the average ...
*Saturday, November 2, 2013 at 1:21pm by D*

**physics**

Calculate the time it takes to fall H = 1.3 m. t = sqrt (2H/g) = 0.515 s Vx = 0.74 m/0.515s = ___ Vx does not change as the ball falls to the floor
*Friday, November 26, 2010 at 8:37pm by drwls*

**Physics**

A basketball is rolled across a gym floor, making 17 revolutions in 3.0 seconds. If the diameter of a basketball is 24 centimeters, the ball rolls approximately
*Wednesday, November 30, 2011 at 1:19pm by ML*

**physics**

a student is riding in an elevator moving vertically down at a constant speed V. If the mass of the student is M, the power delivered to the student by the normal force of the elevator floor is: +MgV zero -MgV MgV^2
*Friday, December 6, 2013 at 8:29pm by sttslt*

**physics**

1)A hiker throws a ball at an angle of 21.0 above the horizontal from a hill 21.0 m high. The hiker's height is 1.750 m. The magnitudes of the horizontal and vertical components are 14.004 m/s and 5.376 m/s, respectivley. Find the distance between the base of the hill and the ...
*Wednesday, April 16, 2008 at 1:10pm by Anonymous*

**physics**

A desk weighing 80 N rests on the floor. The coefficient of friction between the floor and the desk is 0.25. What is the frictional force between yhe desk and the surface of the floor?
*Thursday, December 1, 2011 at 9:46am by maria*

**Math**

a building with 143 windows has more than two floors; each floor has the same number of windows as every other floor. If there are less than a dozen floors how many windows are on each floor.
*Wednesday, January 16, 2013 at 5:39pm by Anonymous*

**Math**

a building with 143 windows has more than two floors; each floor has the same number of windows as every other floor. If there are less than a dozen floors how many windows are on each floor.
*Wednesday, January 16, 2013 at 5:39pm by Anonymous*

**physics**

A stationary billiard ball, mass 0.17 kg, is struck by an identical ball moving at 4.8 m/s. After the collision, the second ball moves off at 60 to the left of its original direction. The stationary ball moves off at 30 to the right of the moving ball's original direction. ...
*Thursday, January 24, 2013 at 3:19pm by Anonymous*

**Physics**

a ball of mass 0.2 kg, initially at rest, is kicked directly toward a fence from a point 20m away. The velocity of the ball as it leaves the kicker's foot is 20m/s at angle of 40 above the horizontal ground. The top of the fence is 4m high. THe kicker's foot is in contact ...
*Sunday, September 17, 2006 at 2:13pm by puff puff*

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