Wednesday

October 1, 2014

October 1, 2014

Number of results: 46,429

**Chemistry**

A horizontal force is applied to a 2-kg ball on a smooth table. The ball's speed is 6 m/s when it has gone 3 m. The magnitude of the force is
*February 9, 2013 by Anonymous*

**math**

The height of a ball that was batted into the air at 150 feet per second is a function of t, the time in seconds after the ball was hit. The height is determined by subtracting 15 times the square of t from 150 times t. Which equation can be used to find t when the ball is 300...
*January 22, 2012 by Anonymous*

**calculus**

A light is attached to the wall of a building 64 feet above the ground. A ball is dropped from the same height, but 20 feet away from the side of the building. The height y of the ball at time t is given by y(t) = 64 − 16t 2 . How fast is the shadow of the ball moving ...
*February 27, 2012 by anonymous*

**Physics**

Concept Simulation 3.2 reviews the concepts that are important in this problem. A golfer imparts a speed of 32.9 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the...
*April 1, 2008 by Will*

**physics**

A ball rolls up a ramp which abruptly ends with the ramp dropping straight down. The ball launches off the end of the ramp while still traveling at an upward trajectory, goes through projectile motion, and returns to the same height as the base of the ramp. Ignoring any ...
*November 1, 2009 by Sandhu*

**Physics**

A rock (m = 1.5 kg) moving at 4.2 m/s north collides with a ball (m = 0.061 kg) that is initially at rest. What is the velocity of the rock after the collision if the velocity of the ball after the collision was 8.4 m/s north?
*January 15, 2012 by Zach*

**physics**

A spring gun (k = 27.1 N/m) is used to shoot a 51.1-g ball horizontally. Initially the spring is compressed by 16.5 cm. The ball loses contact with the spring and leaves the gun when the spring is still compressed by 11.5 cm. What is the speed of the ball when it hits the ...
*October 10, 2012 by Liz*

**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 spring gun launches a ball horizontally from 1.3 m above the floor. the ball strikes the floor 2.2m away, measured horizontally. Calculate A .. the time the ball is flight B... the vertical component of its velocity at the time it strikes the floor C.... the initial ...
*October 9, 2010 by Phanel*

**physical scinsce**

A cannon that is 10m long is designed to launch a 10kg ball over a castle wall. In order to do this the ball must have a speed of at least 50m/s as it exits the cannon. For every 10kg of explosives used, the force on the ball in the cannon increases by 1000N. How many kg of ...
*September 27, 2012 by Christian*

**physical scinsce**

A cannon that is 10m long is designed to launch a 10kg ball over a castle wall. In order to do this the ball must have a speed of at least 50m/s as it exits the cannon. For every 10kg of explosives used, the force on the ball in the cannon increases by 1000N. How many kg of ...
*May 9, 2013 by Help*

**physics**

a soccer player kicks the ball exerting a force 45N on the ball.During the kick .a)Exactly 45N of force on the player;s foot b)More 45N of force on the player;s foot c)Less than 45N of force on the player;s foot d)No force on the player's foot
*September 23, 2010 by Anonymous*

**physics**

A 20 g bullet moving horizontally with a speed v hits a 2-kg block of wood resting on a table. After hitting the block the bullet is embedded in the block of wood and the block and the bullet moves a distance of 40 cm before it stops. If the coefficient of friction between the...
*July 23, 2012 by Edward*

**physics help**

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 ball 2 (b) ...
*November 9, 2010 by david*

**Physics (please check!)**

A positively charged light metal ball is suspended between two oppositely charged metal plates on an insulating thread as shown below. After being charged once, the plates are disconnected from the battery. Describe the behavior of the ball. Would the ball remain in the center?
*May 19, 2008 by BAdams*

**physics**

A .4 kg ball is attached to a spring with spring constant 12 N/m. If the ball is pulled down .2m from the equilibriu, and released, what is its maximum speed while it oscilates?
*September 16, 2010 by Willie*

**physics**

A football punter accelerates a 0.58 kg foot- ball from rest to a speed of 7.0 m/s in 0.25 s.What constant force does the punter exert on the ball? Answer in units of
*September 30, 2010 by nafta herrera*

**physics**

A football punter accelerates a 0.54 kg foot- ball from rest to a speed of 8.7 m/s in 0.24 s. What constant force does the punter exert on the ball? Answer in units of N
*October 21, 2010 by C K*

**Physics**

From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 9.40 m/s and angle of 23.0° below the horizontal. It strikes the ground 5.00 s later. By how much does the ball clear or fall short (vertically) of clearing the ...
*October 12, 2012 by Bill*

**Physics**

From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 9.40 m/s and angle of 23.0° below the horizontal. It strikes the ground 5.00 s later. By how much does the ball clear or fall short (vertically) of clearing the ...
*October 12, 2012 by Bill*

**physics**

After fixing a flat tire on a bicycle you give the wheel a spin. (a) If its initial angular speed was 5.41 rad/s and it rotated 13.7 revolutions before coming to rest, what was its average angular acceleration?
*November 5, 2010 by aok*

**physics, bike**

After fixing a flat tire on a bicycle you give the wheel a spin. Its initial angular speed was 6.50 and it rotated 15.2 revolutions before coming to rest.What was its average angular acceleration?
*January 13, 2011 by john*

**physics**

Calculate the distance traveled by the concrete brick after 0.5 s if it moves with an initial speed of 5 ft/s up the incline whose angle of inclination with the horizontal is 300. Given, coefficient of friction of the incline is 0.144 and g = 32 ft/s2
*April 6, 2012 by ajay*

**Physics**

A boy kicks a football with an initial velocity of 20 m/s at an angle of 30 above the horizontal. What is the vertical component of it's velocity at the highest point of it's trajectory?
*November 6, 2011 by Jj*

**physics**

A ball of mass 200 grams is whirled in a circle at the end of a strong 100 cm long rope whose breaking strength is 10 N. Neglecting gravity, the maximum speed of the ball is approximately.
*September 11, 2010 by Brittany*

**science**

A golfer tees off and hits a golf ball at a speed of 31 m/s and at an angle of 35 degrees. How far did the ball travel before hitting the ground? Round the answer to the nearest tenth of a meter.
*October 9, 2012 by Miguel Hernandez*

**Physics please help!!**

A person who is 1.4 m tall throws a ball with a speed of 4.2 m/s at an angle of 25 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground? The acceleration due to gravity is 10 m/s2
*February 3, 2013 by Julia *

**Physics please help!!**

A person who is 1.4 m tall throws a ball with a speed of 4.2 m/s at an angle of 25 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground? The acceleration due to gravity is 10 m/s2
*February 5, 2013 by Julia *

**Physics question**

Students decide to measure a projectile's range for an initial projectile angle of 45°. This angle has many advantages, not the least being that since the expression for the range is proportional to the sine of twice this angle, errors in determining the angle do not ...
*June 19, 2012 by Anonymous*

**Physics HW Help, Please**

seasoned mini golfer is trying to make par on a tricky hole #5. The golfer can complete the hole by hitting the ball from the flat section it lays on, up a 45° ramp launching the ball into the hole which is d = 1.60 m away from the end of the ramp. If the opening of the hole ...
*November 12, 2012 by Michael*

**Physics HW, Please Help**

A seasoned mini golfer is trying to make par on a tricky hole #5. The golfer can complete the hole by hitting the ball from the flat section it lays on, up a 45° ramp launching the ball into the hole which is d = 1.60 m away from the end of the ramp. If the opening of the hole...
*December 4, 2012 by Michael*

**English**

1. Mt. McKinley is the highest. 2. Mt. McKinley is highest. 3. Mt. McKinley is higher than any other mounttain in the USA. 4. Mt. McKinley is the highest of all the mountains in the USA. 5. Mt. McKinley is highest of all the mountains in the USA. 6. Mt. McKinley is the highest...
*December 3, 2012 by rfvv*

**algebra**

The question I have is to solve the problem. A model rocket is launched from the ground with an initial speed of 50 feet per second. The equation that models its height, h feet, off the ground t seconds after it was fired is h=-16ft^2+50t a)How high is the rocket 1 seconds ...
*May 21, 2013 by Ressie*

**math**

A ball is thrown straight up. Its height, h(in metres), after t seconds is given by h=-5t^2+10t+2. To the nearest tenth of a second, when is the ball 6m above the ground? Explain why there are two answers. I don't get how to calculate it. Please help.
*January 18, 2007 by Shay*

**Physics help!!**

An archer shoots an arrow with a velocity of 45 m/s at an angle of 50 degrees with the horizontal.An assistant standing on the level ground 150m downrange from the launch point throws an apple straight up with the minimum intial speed necessary to meet the path of the arrow. (...
*February 18, 2013 by Sammie*

**science**

a ball is thrown vertically upwards from the top of a tower with a speed of 100 ms-1. it strikes the pond near the base of the tower after 25 seconds. the height of the tower is? a)500m b)125m c)625m
*September 21, 2014 by user001*

**chemistry**

what are the valences expected in unuhexium? the outer is 7s2 7p4 The valency is 6 how do i find the highest hydride and highest fluoride of ununhexium as i have to give an empirical formulae one confused student thank you but could you please explain how you achieve that with...
*January 31, 2007 by bobpursley*

**Physics**

A juggler throws a ball with an initial horizontal velocity of +1.1 m/s and an initial vertical velocity of +5.7 m/s. What is its acceleration at the top of its flight path? Make sure to consider the sign when responding. Consider the upward direction as positive. What ...
*September 13, 2014 by Alexandra *

**AP Physics**

I have two problems i don't understand if you could solve and show me what you did I would appreciate it :) 1.A 62.0-kg person, running horizontally with a velocity of +3.54 m/s, jumps onto a 13.4-kg sled that is initially at rest. (a) Ignoring the effects of friction during ...
*December 5, 2010 by Deanna*

**physics**

A child is twirling a 0.0100 kg ball on a string in a horizontal circle whose radius is 0.118 m. The ball travels once around the circle in 0.460 s. (a) Determine the centripetal force acting on the ball. (b) If the speed is doubled, does the centripetal force double? (yes or ...
*October 23, 2010 by Fred*

**Calculus**

A ball is dropped from a height of 10 feet and bounces. Each bounce is ¨ú of the height of the bounce before. Thus, after the ball hits the floor for the first time, the ball rises to a height of 10(¨ú ) = 7.5 feet, and after it hits the second floor for the second time, it ...
*April 15, 2009 by Sandy*

**Physics**

A ball is thrown straight up into the air with a velocity of +20.5 m/s. Find the velocity of the ball after 2.5 s.
*June 19, 2011 by Leasha*

**physics**

A ball is dropped from a height of 168 m. What is the ball height from ground after 2.24 sec of falling?
*September 28, 2013 by Anonymous*

**physics**

A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 9.50 m/s at an angle of 24.0° below the horizontal. It strikes the ground 5.00 s later. (a) How far horizontally from the base of the building does the ball strike the ground? ...
*May 16, 2007 by micole*

**Physics**

A 500 g metal ball is whirled in a vertical circle. What is the centripetal force which draws it toward the center of the circle as it passes through the highest point?
*December 30, 2012 by Jem*

**physics**

A football is thrown horizontally with an initial velocity of (16.5 m/s). Ignoring air resistance, the average acceleration of the football over any period of time is (-9.81 m/s2). (a) Find the velocity vector of the ball 1.62 s after it is thrown. (b) Find the magnitude and ...
*May 14, 2007 by micole*

**physics**

Your friend has climbed a tree to a height of 6.00 m. You throw a ball vertically up to her and it is traveling at 5.00 m/s when it reaches her. What was the speed of the ball when it left your hand if you released it at a height of 1.10 m?
*December 20, 2010 by sabeen*

**physics**

A ball is shot horizontally at a speed of 10 m/s from a height of 2 meters. How long is the ball in the air and how far horizontally does it travel before it hits the ground?
*June 22, 2011 by Anonymous*

**physics**

A small steel ball rolls off a table (1 meter high) with a speed of 2 m/s. Where should they place a can (15 cm high; diameter 10 cm) to catch the ball?
*October 18, 2011 by mimi*

**physics**

A ball moving at a speed of 2.0 m/s rolls off a horizontal table. If the table is 1.2 m high, how far does the ball travel horizontally in m when it strikes the floor
*September 25, 2012 by flip*

**physics**

A small steel ball rolls off a table (1 meter high) with a speed of 2 m/s. Where should they place a can (15 cm high; diameter 10 cm) to catch the ball?
*October 17, 2013 by Anonymous*

**Physics**

A 0.2kg ball is attached to a rope and is whirled in a horizontal circle. Calculate the maximum speed of the ball if the length of the rope is 0.8m and its breaking strength is 0.9N
*June 14, 2014 by alice*

**math**

For every 3 boys at soccer camp there are 2 girls. If there are 20 children at soccer camp.How many are girls?
*January 7, 2013 by jessica*

**Relative Uncertainty**

As before, they make measurements to determine the initial speed. This time they find the initial speed to be 3.26 m/s with a relative uncertainty of 2.5% What is predicted range? I got that it's 108.444 What is the uncertainty in the predicted range? This is whats getting me.
*September 23, 2009 by Sarah*

**12th grade - Advanced Functions**

the height, h, in meters, of a gold ball t seconds after is is hit can be modelled by the function: h (t) = 4.9t^2 + 32t + 0.2. When is the height of the ball 15 m?
*July 19, 2010 by Nish*

**physics**

a ball rolling on oa inclined plane dors so with constant acceleration. One ball, A, is released from rest on th etop of an inclined plane 18m long to reach the bottom 3s later. At the same time as A is released, another ball, B, is projected up the same plane with a certain ...
*March 24, 2013 by edward *

**physical**

A cannon that is 10m long is designed to launch a 10kg ball over a castle wall. In order to do this the ball must have a speed of at least 50m/s as it exits the cannon. For every 10kg of explosives used, the force on the ball in the cannon increases by 1000N. How many kg of ...
*September 27, 2012 by Christian*

**Physics**

I have some questions regarding motion problems. If I have a ball at initial velocity of 50m/s at 35 degree angle, to find horizontal and vertical components, I do the following: Vertical is 50(sin35)=28.68-rounded to 29 Horizontal = 50 (cos 35)=40.96-rounded to 42 Maximum ...
*October 8, 2010 by Katherine*

**calculus HELP!**

A person stands on a bridge that is 100 feet above a river. If she drops a pebble how fast is it moving after 2 seconds? How long does it take the pebble to reach the river below? She has another pebble that she tosses up with initial speed of 8 feet per second. It goes up, ...
*November 6, 2013 by Danielle*

**business math**

Of the 4800 students at Medium Suburban College (MSC), 50 play collegiate soccer, 60 play collegiate lacrosse, and 96 play collegiate football. Only 6 students play both collegiate soccer and lacrosse, 6 play collegiate soccer and football, and 16 play collegiate lacrosse and ...
*November 14, 2010 by liz c *

**science**

A ball hit by a player too 2.4s to reach the short stop from home plate. If the short stop threw the ball to first base at a speed of 20m/s, a distance of 30m, how long would the runner have to make it to first base and arrive at the same time as the ball. (the answer is in ...
*June 9, 2012 by amy*

**physics**

Two golf balls are thrown with the same speed off the top of a large bridge at the same time. Ball A is thrown straight downward, and Ball B is thrown horizontally off the bridge. Which ball hits the ground first?
*July 29, 2013 by cammi*

**physics**

the speed of the fastest pitched baseball was 45 m/s, and the ball's mass was 145 g. (a) What was the magnitude of the momentum of this ball, and how many joules of kinetic energy did it have? (b) How fast would a 57 gram ball have to travel to have the same amount of (i) ...
*October 28, 2009 by sarah*

**physics**

A little red wagon with mass 8.00 moves in a straight line on a frictionless horizontal surface. It has an initial speed of 3.80 and then is pushed 4.7 in the direction of the initial velocity by a force with a magnitude of 10.0 .
*April 11, 2013 by Anonymous*

**Physic assignment**

A 1.5okg ball whose velocity is 8mls southward collides with a 2kg ball traveling along the same path with a velocity of 3mls southward.if the velocity of the 2kg ball is 7.29mls southward after impact.what is the velocity of the 1.50kgball?
*March 5, 2014 by Anonymous*

**Physics**

A ball is thrown at an angle of 37.1degrees above the horizontal from a point on the top of a building and 60m from the edge of the building. It just misses the edge of the building and continues on towards the ground. The building is 50m high. At what speed was the ball ...
*March 13, 2008 by Anonymous*

**Physics**

A 15500 N automobile travels at a speed of 41 km/h northward along a street, and a 7000 N sports car travels at a speed of 65 km/h eastward along an intersecting street. a)If neither driver brakes and the cars collide at the intersection and lock bumpers, what will the ...
*December 11, 2010 by Kelsey*

**Physics urgent**

An archer shoots an arrow with a velocity of 45.0m/s at an angle of 50.0degrees with the horizontal.An assistant standing on the level ground 150m downrange from the launch point throws an apple straight up with the minimum intial speed necessary to meet the path of the arrow...
*February 22, 2013 by Sammie*

**Physics- hard problem**

A 14000 N automobile travels at a speed of 40 km/h northward along a street, and a 7000 N sports car travels at a speed of 62 km/h eastward along an intersecting street.(a) If neither driver brakes and the cars collide at the intersection and lock bumpers, what will the ...
*December 19, 2013 by Bryan*

**algebra**

A ball falls from the top of a roof 320 feet above the ground. The formula h = -16t2 + 16t + 320 described the height of the ball above the ground, h, in feet, t seconds after the fall begins. How long will it take the ball to strike the ground?
*May 16, 2010 by Anonymous*

**Help Please! Science**

Stomach acid (1.5) is 750 times for acidic than tomatoes (4.0). Can you explain to me why it is 750 times?
*January 27, 2013 by Anonymous*

**Physics**

A ball is fired from a height of 3.0 m above the ground,with a speed of 13 m/s and an angle of 22 degrees below the horizontal.(a) At what time does the ball hit the ground? (b) What is the impact velocity?
*October 4, 2009 by Sandhu*

**physics**

A 8.5-kg bowling ball is rolling down the alley with a velocity of 3.5 m/s. For each impulse, a and b, as shown below, find the resulting speed and direction of motion of the bowling ball.
*December 6, 2010 by lets go*

**physics**

A cannon tilted up at a 26.0 degree angle fires a cannon ball at 78.0 m/s from atop a 12.0 m-high fortress wall. What is the ball's impact speed on the ground below?
*March 21, 2011 by duke*

**physics**

A ball is thrown from a cliff upward with a speed of 20 m/s, the angle is 33 degrees and the ball hits the ground 9.2 seconds later, how high is the cliff to the nearest meter?
*January 19, 2012 by Jason*

**Physics**

A cannon tilted up at a 34.0^\circ angle fires a cannon ball at 69.0 m/s from atop a 23.0 m-high fortress wall. What is the ball's impact speed on the ground below?
*March 29, 2012 by Cody*

**kctcs**

the ball thrown the brick wall bounces directly back with the same speed it had when it struck the wall . has the velocity of the ball change explain ?
*February 5, 2013 by sahar *

**Physics**

A 50 kg skater at rest on a frictionless rink throws a 2 kg ball, giving the ball a velocity of 10 m/s. Which statement describes the skaters subsequent motion? Explain please. a. 0.4 m/s in the same direction as the ball. b. 0.4 m/s in the opposite direction of the ball. c. 2...
*December 2, 2012 by Alexa*

**PHYSÝCS**

The figure shows the paths of a golf ball your friend drops from the window of her apartment and of the rock you throw from the ground at the same instant. The rock and the ball collide at x = 34.14 m, y = 17.75 m, and t = 2.71 s. If the ball was dropped from a height of h = ...
*February 27, 2012 by please please please helpppp*

**Physics**

A diver performing a double somersault spins at an angular speed of 4.5 π rad/s precisely 0.70s after leaving the platform. Assuming the diver begins with zero initial angular speed and accelerates at a constant rate, what is the diver’s angular acceleration during the ...
*March 28, 2012 by Ethan*

**Physics**

An 893 kg car passes over a bump in a road that follows the arc of a circle of radius 14.3 meters. A) What force does the road exert on the car as the car passes the highest point of the bump if the car travels 7.53 m/s. B) What is the max speed the car can have as it passes ...
*December 4, 2011 by Ryan*

**chemistry final-urgent**

Choose the element with the highest ionization energy element: Na, Mg, Al, P, S In my book: ionization energy increase from left to right and bottom to top. Na<Mg<Al<P<S S is highest ionization energy? my instructor review this problem and his answer is P is a ...
*December 14, 2010 by lianne*

**physics**

A basketball player 1.9 m tall wants to make a basket from a distance of 7.8 m. The hoop is at a height of 3.05 m.If he shoots the ball (from a height of 1.9 m) at a 23.5 angle, at what initial speed must he shoot the basketball so that it goes through the hoop without ...
*October 16, 2012 by scott*

**intermediate algebra**

A projectile is launched directly upward from the top of a 112 - foot building with an initial velocity (speed) of 96 feet per second. This translates to the h(t) = -16t^2 + 96t + 112 where h(t) is the height of the projectile in feet and t is the time in seconds after it is ...
*November 6, 2008 by jennifer*

**calculus**

If a ball is thrown vertically upward with a velocity of 160 ft/s, then its height after t seconds is s = 160t - 16t^2 What is the velocity of the ball when it is 96 ft above the ground on its way up?
*November 14, 2008 by fred*

**URGENT MATH HELP!**

When a ball is thrown upward, its height, h, in metres, is given by h=1.5 +19.6t -4.9t², where t is the number of seconds after it is thrown. For what length of time is the ball above the ground?
*March 27, 2012 by lost*

**math ms sue please help, PLEASE!!!!**

the giants and the redskins played in Sunday night football. the giants kicked 2 field goals and the redskins kicked 5 field goals. write a ratio that describes the number of giant field goals to redskin field goals.
*December 11, 2013 by math help*

**algebra**

In a real-life situation, to model the distance x and the height of hitting a baseball y as in: y = ax^2 + bx + c 1. When dealing with the initial height of the ball, what is happening when x = 0? Is it that the ball has not yet traveled any distance? 2. What are the possible ...
*October 8, 2011 by Anil*

**Physics **

A ball is thrown horizontally from the top of a 65 m building and lands 105 m from the base of the building. Ignore air resistance, and use a coordinate system whose origin is at the top of the building, with positive y upwards and positive x in the direction of the throw. 1...
*September 11, 2014 by Lauren HELP *

**Physics**

A juggler performs in a room with a ceiling 2m abouve hand level. A. what is the maximum upward speed she can give the ball without hitting the celing. B. what is the time spent in the air before the ball is caught?
*October 22, 2009 by Anonymous*

**physics**

A baseball is thrown at an angle of 23◦ relative to the ground at a speed of 22.3 m/s. The ball is caught 36.4649 m from the thrower. The acceleration due to gravity is 9.81 m/s2 . How long is it in the air? How high is the tallest spot in the ball’s path?
*November 26, 2010 by john*

**Physics(Please check, thanks)**

A football player kicks a ball with a speed of 25m/s at an angle of 40 degrees relative to the horizontal. Ignore air resistance. 1) What is the ball's range? R= V0^2 sin Q / g Is this the correct equation to use?
*June 20, 2012 by Hannah*

**physics**

two balls are dropped to the ground from different heights. one ball is dropped 2s after the other but they both strike the ground at the same time, 5s after the first is dropped. what is the difference in height from which they are dropped? from what height was the first ball...
*June 14, 2011 by pavatharani*

**physics**

An outfielder throws a baseball from the outfield to the third baseman. In flight, the ball reaches a height of 25 ft above the ground. The outfielder releases the ball from a height of 6 ft above the ground with a speed of 124 ft/sec. The ball is caught 6 ft above the ground ...
*November 22, 2010 by sandhu*

**math calculus**

A person stands on a bridge that is 100 feet above a river. If she drops a pebble how fast is it moving after 2 seconds? How long does it take the pebble to reach the river below? She has another pebble that she tosses up with initial speed of 8 feet per second. It goes up, ...
*November 6, 2013 by Kimmie*

**physics**

A 5.00 g bullet moving with an initial speed of 340 m/s is fired into and passes through a 1.00 kg block. The block, initially at rest on a frictionless, horizontal surface, is connected to a spring of force constant 860 N/m. (a) If the block moves 5.50 cm to the right after ...
*March 23, 2009 by Jennifer*

**Physics**

A projectile is shot from the ground at an angle of 60 degrees with respect to the horizontal, and it lands on the ground 5 seconds later. Find: a. the horizontal component of initial velocity b. the vertical component of initial velocity c. initial speed
*November 22, 2011 by nam maurer*

**Physics**

A projectile is shot from the ground at an angle of 60 degrees with respect to the horizontal, and it lands on the ground 5 seconds later. Find: a. the horizontal component of initial velocity b. the vertical component of initial velocity c. initial speed
*November 23, 2011 by nam maurer*

**physics**

umm i need help...which equation would i use to solve the probnlem and how do i go about finding the answer? Here it is: Sam tosses a ball horizontally off a footbridge at 3.1 m/s. How much time passes after he releases it until its speed doubles?
*December 20, 2010 by tj*

**chemistry**

Which has the highest boiling point and lowest freezing point? (a) 0.4 m NaCl 0.3 m Na2SO4 0.5 m sucrose (nonelectrolyte) (b)0.2 m HCl 0.2 m acetic acid 0.3 m KOH (weak electrolyte) (c) 0.5 m ethylene glycol (nonelectrolyte) 0.4 m glucose (nonelectrolyte) 0.3 m BaCl2 ...
*January 22, 2009 by Sarah*

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