Thursday

August 21, 2014

August 21, 2014

Number of results: 29,789

**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 rebounds to one quarter from which it was dropped. approximate the total vertical distance the ball after being dropped from 3ft above the ground ,until it comes to rest
*April 15, 2014 by anna*

**PHYSICS**

the speed of a bowling ball is 2.0m/s as it falls past a window of a tall building. using conservation of energy ,determine how fast it was going as it past another window 3.0m below.
*July 11, 2014 by EMMA*

**Algebra**

A rubber ball rebounds 3/5 of the height from which it falls. If it is initially dropped from a height of 30 ft. What total vertical distance does it travel before coming to rest?
*January 28, 2012 by PDF*

**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*

**Trig**

A 60 ft. antenna stands on top of a building, From a point on the ground, the angles of elevation to the top and bottom of the antenna measure 58 and 44 respectively. How tall is the building
*April 5, 2011 by John*

**Pre-Cal**

Angles of elevation to an airplane are measured from the top and the base of a building that is 40 m tall. The angle from the top of the building is 37°, and the angle from the base of the building is 40°. Find the altitude of the airplane. (Round your answer to two decimal ...
*November 28, 2012 by Kendall*

**trig**

angles of elevation to an airplane are measured from the top and the base of a building that is 40 m tall. The angle from the top of the building is 31°, and the angle from the base of the building is 40°. Find the altitude of the airplane. (Round your answer to two decimal ...
*November 28, 2012 by Barb*

**physics please help**

A soccer ball is kicked from the top of a 256 -foot building with an initial velocity of 6 ft/s. How far from the base of the building will the ball land?
*October 19, 2008 by carissa*

**Physics**

A soccer player kicks a 0.43 kg ball straight up to see how far it will rise. The ball starts with a velocity of 16m/s at a height of 0.85m above the ground. It rises then falls straight down to the ground. a) what is the total energy of the ball just after it is kicked? b) ...
*May 4, 2014 by cee*

**physics**

Standing on top of the science building, which is 48 m high, a group of students use a slingshot to shoot a steel ball bearing straight up into the air. The ball bearing passes the students on its way down to the ground 3.2 sec after it was shot. (once the ball bearing leaves ...
*September 27, 2010 by karla*

**physics **

If an object is dropped from a tall building and hits the ground 3.0 s later, what is the velocity of the object when it hits the ground? (Remember that the velocity is downward) i got -29m/s is this correct?
*November 7, 2012 by kathryn*

**physics**

Ball A is dropped from the top of a building of height h at the same instant that ball B is thrown vertically upward from the ground. When the balls collide, they are moving in opposite directions, and the speed of A is twice the speed of B. At what height does the collision ...
*August 9, 2014 by Danielle*

**math**

how do i work out the following word problem. a particular ball retains half of its heght on each bounce when dropped from a height of 80 m. give the height of the ball on the fifth bounce after being dropped?(will the ball comes to rest?)
*May 19, 2012 by ladane*

**science**

Two stones are launched from the top of a tall building. One stone is thrown in a direction 30.0degree above the horizontal with a speed of 10.0m/s ; the other is thrown in a direction 30.0degree below the horizontal with the same speed. Which stone lands farther away from the...
*September 8, 2008 by bob*

**calc**

A light is at the top of a pole 80ft high. A ball is dropped at the same height from a point 20ft from the light. If the ball falls according to 2=16t^2, how fast is the shadow of the ball moving along the ground 1 second later? please help!!! Let x be the distance of the ...
*November 9, 2006 by keneth*

**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**

You can use any coordinate system you like in order to solve a projectile motion problem. To demonstrate the truth of this statement, consider a ball thrown off the top of a building with a velocity v at an angle θ with respect to the horizontal. Let the building be 49.0 ...
*February 5, 2014 by Malorie*

**trig**

Question Part Points Submissions Used The angle of elevation to the top of a very tall Building is found to be 7° from the ground at a distance of 1 mi from the base of the building. Using this information, find the height of the building.
*October 2, 2011 by sanam*

**Physics **

A rock thrown straight up with a velocity of 29 m/s from the edge of a building just misses the building as it comes down. The rock is moving at 44 m/s when it strikes the ground. How tall was the building? The acceleration of gravity is 9.8 m/s Answer in units of m
*September 3, 2012 by Diane*

**Math - Trig**

From the foot of a building I have to look upwards at an angle of 22degrees to sight the top of a tree. From the top of a building, 150 meters above ground level, I have to look down at an angle of depression of 50degrees to look at the top of the tree. a. How tall is the tree...
*December 14, 2013 by McKenna Louise*

**science**

If we drilled a hole straight through the earth, and dropped a golf ball down the hole, starting initially at rest, how fast would the ball be traveling when it reached the center of the earth. The earth’s radius is 6378 km.
*February 6, 2014 by kristi*

**Trigonometry**

From the foot of a building I have to look upwards at an angle of 22degrees to sight the top of a tree. From the top of a building, 150 meters above ground level, I have to look down at an angle of depression of 50degrees to look at the top of the tree. a. How tall is the tree...
*December 15, 2013 by Marie Ashley*

**Science**

A ball dropped from the roof of a building take 4s to reach the street. How high is the building?
*September 21, 2011 by yolanda*

**physics**

a ball is dropped off a 20m high building, the ball weights 5 g. how long does it take to hit the ground and what is the instaneous speed of the the ball at each second of it's fall?
*October 17, 2010 by m,ary*

**Physics ?#2**

A ball is dropped from the top of a 53.0m high cliff. At the same time, a carefully aimed stone is thrown straight up from the bottom of the cliff with a speed of 25.0m/s The stone and ball collide part way up. How far above the base of the cliff does this happen in meters?
*September 8, 2009 by Cara*

**Physics**

A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
*November 19, 2012 by Joshua*

**Physics**

A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
*November 19, 2012 by Joshua*

**Physics**

A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
*November 19, 2012 by Joshua*

**Physics**

A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
*November 19, 2012 by Anonymous*

**Physics**

A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
*November 21, 2012 by Stan*

**Math - Trig**

From the foot of a building I have to look upwards at an angle of 22° to sight the top of a tree. From the top of a building, 150 meters above ground level, I have to look down at an angle of depression of 50° to look at the top of the tree. a. How tall is the tree? b. How far...
*December 12, 2013 by Shelley Nicole*

**AP Physics**

A rock thrown straight up with a velocity of 30 m/s from the edge of a building just misses the building as it comes down. The rock is moving at 47 m/s when it strikes the ground. How tall was the building? The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m.
*August 24, 2010 by Alex*

**trig**

At 2 points 95 ft apart on a horizontal line perpendicular to the front of a building, the angles of elevation of the top of the building are 25 degrees and 16 degrees. How tall is the building?
*February 14, 2011 by Greg*

**math**

From the foot of a building I have to look upwards at an angle of 22° to sight the top of a tree. From the top of a building, 150 meters above ground level, I have to look down at an angle of depression of 50° to look at the top of the tree. a. How tall is the tree? b. How far...
*February 11, 2014 by mackenzie*

**Physics**

A ball, dropped from rest, cover 2/7 of the distant to the ground in the last 2 seconds of its fall. From what height was the ball dropped? What was the total time of the fall?
*October 11, 2009 by Robert C*

**College Algebra**

How long would it take for a ball dropped from the top of a 400 foot building to hit the ground? Round your answer to two decimal places Use gravity formula
*January 25, 2012 by Heather *

**science**

a ball is dropped from the roof of a building. it takes 10 seconds to reach the ground. find the height of the building.(g=9.8/s square)
*August 8, 2013 by swagster*

**physics**

A stone is dropped from the roof of a tall building. A person measures the speed of hte stone to be 49 m/s when it hits the ground. What is the height of the building?
*September 18, 2011 by shannon*

**physics**

From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the drawing shows, the bullet puts a hole in a window of another building and hits the wall that faces the window. h is 0.54 m and d is 8.0 m. Assume ...
*October 24, 2010 by Gabbi*

**algebra 2**

if a rock is dropped from the top of a 200 ft building, solve for the time it takes for it to hit the ground. (when h=0) hint-initial velocity when dropped is 0
*May 26, 2013 by maddy*

**math**

Standing on the top of a building, Eric spots his friend's car at an angle of depression of 35°. The car is 360 feet from the base of the building. How tall is the building to the nearest hundredth of a foot?
*June 12, 2013 by Anonymous*

**physics**

A boy standing on top of a building throws a small ball from a height of H1 = 43.0 m. The ball leaves with a speed of 14.9 m/s, at an angle of 55.0 degrees from the horizontal, and lands on a building with a height of H2 = 14.0 m. Calculate for how long the ball is in the air...
*January 21, 2014 by John*

**Physics **

On a planet that has no atmosphere, a rocket 14.2 m tall is resting on its launch pad. Freefall acceleration on the planet is 4.45 m/s2. A ball is dropped from the top of the rocket with zero initial velocity. (a) How long does it take to reach the launch pad? (b) What is the ...
*October 20, 2010 by Maria *

**Physics**

Mass 1 with a mass of 28.5 kg starts at rest at the top of a frictionless from a height of 17 meters. It then slides down the incline and moves over a horizontal frictionless surface and collides inelastically (head on) with mass 2 which is of unknown mass. After the ...
*November 15, 2012 by Chelsea*

**Algebra I**

A 15 foot flagpole is mounted on top of a school building. If the top of the flagpole forms a 31° angle with the ground 50 ft from the base of the building, about how tall is the school building? 28 feet <-My answer 15 feet 30 feet <-second choice 11 feet
*September 10, 2012 by Panda*

**Physics**

A 2.98 kg ball is dropped from the roof of a building 158.3 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 13.1 N on the ball. A.)How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s^2. Answer in units of s ...
*January 29, 2013 by Big Poppa Smurf*

**Physics**

You can use any coordinate system you like in order to solve a projectile motion problem. To demonstrate the truth of this statement, consider a ball thrown off the top of a building with a velocity v at an angle è with respect to the horizontal. Let the building be 50.0 m ...
*August 30, 2009 by Annmay*

**math**

the angle of depression of the top and bottom of an 8m tall building from the top of a multi storyed buiding are 30degree and 45 degree respectively find the height of the multi storyed building and the distance between 2 buildings
*January 17, 2012 by rim*

**physics**

a ball is dropped from a tower 122.5meters tall. how long does it take the ball to reach the ground?
*October 5, 2011 by m kay*

**physics**

a ball dropped from a cliff falls with a constant acceleration of 10m/s*s . through how much distance the ball will fall in the 5th second
*August 29, 2009 by sara*

**Physics**

A solid brass ball of mass 9.5 g will roll smoothly along a loop-the-loop track when released from rest along the straight section. The circular loop has radius R = 4.2 m, and the ball has radius r << R. (a) What is h if the ball is on the verge of leaving the track when...
*November 17, 2011 by Bridgette*

**MATH**

A silver dollar is dropped from the top of a building that is 1398 feet tall. Use the position function below for free-falling objects. (Round your answers to 3 decimal places.) s(t) = -16t2 + v0t + s0 (a) Determine the position and velocity functions for the coin. s(t) = v(t) =
*February 15, 2012 by Anonymous*

**Math**

math word problem a building 240ft tall casts a 100 foot long shadow. If a person stands at the end of the shadow and looks up to the top of the building, what is the angle of the persons eyes to the top of the building(to the nearest hundredth of a degree)?(assume the persons...
*April 29, 2013 by Jay*

**Calc**

When a certain type of ball falls froma height of h onto a hard level surface, it bounce straight back up to a height of kh, where k is constant with 0<k<1. suppose this ball is dropped from an initial height h0 a) let the terms of the sequence {hn}from n=1 to infinity ...
*April 21, 2014 by Stuck in Math*

**trig**

From the foot of a building i have to look upwards at an angle of 22 degrees to sight the top of a tree. From the top of a building, 150 meters above ground level, I have to look down at an angle of depression of 50 degrees to look at the top of the tree. A) How tall is the ...
*February 27, 2014 by Jiskha*

**math**

The angle of depression of two points on opposite sides of a building are on the same horizontal level with the foot of the buiding are 58 and 49 respectively from the top of the building. If the building is 38m tall, calculate the distance between the points.
*July 15, 2010 by Daniel*

**Calculus**

A chain 64 meters long whose mass is 20 kilograms is hanging over the edge of a tall building and does not touch the ground. How much work is required to lift the top 3 meters of the chain to the top of the building?
*September 29, 2012 by Ryan*

**trigo**

the L and C State building is 1,250 m tall. What is the angle of elevation of the top from a point on the ground 1,760 m from the base of the building?
*July 31, 2010 by trigofunctions*

**trigo**

The L and C State Building is 1,250 m tall. What is the angle od elevation of the top from a point on the ground 1,760 m from the base of the building?
*August 1, 2010 by trigofunctions*

**physics**

metal ball and rubber ball dropped in the 20 ft building in the same time.
*February 7, 2010 by marvin*

**physics**

a ball is thrown vertically upward from the top of the building with a velocity 10m/s.it reaches the ground in 5 sec.Find the height of the building the ball strikes the ground?
*September 13, 2012 by p*

**physics**

A ball of volume V=8 L is full of air with pressure higher than atmospheric pressure by Δp=2×10^4 Pa. The total mass of the ball and the air inside is 200 g. The ball is tossed up to a height h=20 m, then it falls down, collides with the ground, and bounces back up. ...
*April 30, 2013 by jfchfrhrc*

**physics**

A ball of volume V=8 L is full of air with pressure higher than atmospheric pressure by Δp=2×10^4 Pa. The total mass of the ball and the air inside is 200 g. The ball is tossed up to a height h=20 m, then it falls down, collides with the ground, and bounces back up. ...
*April 30, 2013 by jfchfrhrc*

**Physics**

A 50-g ball collides elastically with a 290-g ball that is at rest. If the 50-g ball was traveling in the positive x-direction at 4.75 m/s before the collision, what are the velocities of the two balls after the collision? 290-g ball: magnitude m/s ? 50-g ball: magnitude m/s...
*March 17, 2012 by Angelina*

**calculus**

A ball is dropped from the top of a building. The height, , of the ball above the ground (in feet) is given as a function of time, , (in seconds) by y = 1640 - 16t^2 y'= -32t When does the ball hit the ground, and how fast is it going at that time? Give your answer in feet per...
*November 14, 2010 by Ashley*

**algebra**

The height of a ball dropped from a tall building is modeled by the equation d(t) = 16t2 where d equals the distance traveled at time t seconds and t equals the time in seconds. What does the average rate of change of d(t) from t = 2 to t = 5 represent?
*March 29, 2014 by Anonymous*

**physics**

A 3.60 kg ball is dropped from the roof of a building 184.8 m high. While the ball is falling to earth, a horizontal wind exerts a constant force of 12.1 N on the ball. How long does it take to hit the ground? (acceleration of gravity = 9.81 m/s^2)
*November 6, 2009 by Ash*

**physics**

A 4.05 kg ball is dropped from the roof of a building 171.4 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 12.5 N on the ball. How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s^2.
*November 6, 2010 by Harmonie*

**physics**

A 3.61 kg ball is dropped from the roof of a building 152.5 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 11.6 N on the ball. How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s^2
*December 17, 2010 by john*

**math**

a building casts a 25 foot shadow on a sunny day. If the angle of elevation from the tip of the shadow to the top of the building is 65 degrees, what is the height of the building to the nearest tenth of a foot? I did tan =x/25 x=25tan65 x=53.61267301 x=53.6 feet the height of...
*March 3, 2014 by diane*

**Calculus**

A ball is dropped from the top of a building. The height, , of the ball above the ground (in feet) is given as a function of time, , (in seconds) by y = 1640 - 16t^2 y'= -32t When does the ball hit the ground, and how fast is it going at that time? Give your answer in feet ...
*November 14, 2010 by Ashley*

**phy**

A ball of mass 0.540 kg moving east (+x direction) with a speed of 3.30 m/s collides head-on with a 0.740 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision? a)ball originally at rest m/s b)ball ...
*October 7, 2010 by ami*

**physics**

A ball falls from rest on another planet. It falls 30 m, reaching a velocity of 15m/s. Determine its acceleration.
*September 28, 2010 by katelyn*

**Physics**

A baseball is released at rest from the top of the washington Monument. It hits the ground after falling for 6.0 s. What was the height from which the ball was dropped? (g=9.8 m/s2 and assume air resistance is negligible)
*December 3, 2010 by Jesse*

**physics**

a projectile is fired from the top of a building with an initial velocity straight upward at 40m/sec. the top of the building is 50 meters above the ground? a) the maximun height of the projectile above the building b) the time for the projectile to reach the top c) the ...
*October 15, 2011 by daniel*

**physics**

A golf ball threw by a friend from a window of her apartment collides with a rock that you throw at the same moment at x=44.07m and y=13.63 m, and t=2.56 s. If the ball was dropped from a height of h=45.78 m, determine the initial velocity of the rock(write de x- and y- ...
*February 28, 2012 by abad*

**physic**

As you look out of your dorm window, a flower pot suddenly falls past. The pot is visible for a time t, and the vertical length of your window is Lw. Take down to be the positive direction, so that downward velocities are positive and the acceleration due to gravity is the ...
*September 29, 2013 by koler*

**physic**

As you look out of your dorm window, a flower pot suddenly falls past. The pot is visible for a time t, and the vertical length of your window is Lw. Take down to be the positive direction, so that downward velocities are positive and the acceleration due to gravity is the ...
*October 3, 2013 by koram*

**Physics. LAST PROBLEM!!**

A small metal ball with a mass of m = 82.5 g is attached to a string of length l = 1.72 m. It is held at an angle of θ = 58.5° with respect to the vertical. The ball is then released. When the rope is vertical, the ball collides head-on and perfectly elastically with an ...
*March 26, 2013 by Elena*

**Physics**

A 3.79 kg ball is dropped from the roof of a building 163.8 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 11.5 N on the ball. How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s2 . Answer in units of s.
*December 17, 2010 by Sangita*

**science math practice **

a 60.0-kg person walks from the ground to the roof of a 74.8-m-tall building. how much gravitational potential energy does she have at the top of the building?
*March 8, 2012 by celeste *

**Math**

Billy is standing 80 feet from the base of a building. The angle of elevation to the top of the building is 35 degrees. If the distance from Billy's eyes to the ground is five feet, how tall is the building?
*February 8, 2012 by Nikki*

**Algebra 2**

Can someone please explain how to do this problem? A 450 foot tall building is near a shorter building. A person on top of the shorter building finds the angle of elevation of the roof of the taller building to be 25 degrees and the angle of depression of its base to be 35 ...
*April 30, 2014 by Jane*

**college physics**

A small ball of mass m is aligned above a larger ball of mass M = 0.79 kg (with a slight separation), and the two are dropped simultaneously from height h = 2.0 m. (Assume the radius of each ball is negligible relative to h). (a) If the larger ball rebounds elastically from ...
*November 12, 2009 by Steve*

**math**

A 2 m tall person standing on the ground looks up at an angle of 34.0 o with the horizontal and sees the top of a tree and the top of a building aligned. The tree is 20 m away from the person, and the building is 51.0 m from the person
*January 15, 2013 by tim*

**math**

A 2 m tall person standing on the ground looks up at an angle of 34.0 o with the horizontal and sees the top of a tree and the top of a building aligned. The tree is 20 m away from the person, and the building is 51.0 m from the person
*January 15, 2013 by tim*

**physics**

A ball is thrown horizontally from the roof of a building 33.0 m tall and lands 20.5 m from the base. What was the ball's initial speed?
*September 21, 2010 by Jamie*

**physics**

A ball is thrown horizontally from the roof of a building 59.0 tall and lands 27.4 from the base. What was the ball's initial speed?
*September 21, 2011 by alexis*

**Physics**

A ball is thrown horizontally from the roof of a building 55 m tall and lands 50 m from the base. What was the ball's initial speed?
*October 13, 2011 by Millie*

**physics**

please help me with this question " king kong carries a Fay Wrap up the 321-m-tall empire state building. at the top of the shyscraper, Fay Wrap's shoe falls from her foot. how fast will the shoe be movinig when it hits the ground?"
*September 24, 2008 by lakesha*

**Physics**

A ball of mass 0.640 kg moving east (+x direction) with a speed of 3.10 m/s collides head-on with a 0.780 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision? 1. ball originally at rest 2. ball ...
*November 24, 2009 by Fred*

**Calculus**

A fence 3 feet tall runs parallel to a tall building at a distance of 3 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building. Answer the following: The distance along the ladder to the top ...
*June 18, 2013 by Morgan*

**geometry**

a ladder is placed next to a building to get to the top. the bottom of the ladder is placed 7 feet away from the building at an angle of 56 degrees.how tall is the building?
*January 29, 2013 by jenna*

**Physics**

A 57-kg lead ball is dropped from the leaning tower of Pisa. The tower is 56 m high. (b) What is the speed of the ball after it has traveled 2.5 m downward?
*January 22, 2012 by Anonymous*

**PHISIC help**

A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
*December 21, 2012 by zak*

**Physics/ Precalculus**

If a ball is thrown upward from a building 30 m tall and the ball has a vertical velocity of 25 m/s, then its approximate height above the ground t seconds later is given by h(t) = 30 + 25t - 5t^2 a. After how many seconds does the ball hit the ground? b. What is the domain of...
*February 2, 2009 by Gerrad*

**physics**

A ball is thrown horizontally from the roof of a building 60 m tall and lands 45 m from the base. What was the ball's initial speed? _______m/s
*September 21, 2010 by Andy*

**Physics**

A .5kg ball is dropped from a 30m high building is on the ground for 2ms then bounces up 20m. What avg force was exerted on the ball?
*August 23, 2012 by Jordan *

**Science**

a .5kg ball is dropped from a 30m high building is on the ground for 2ms then bounces up 20m. What avg force was exerted on the ball?
*August 23, 2012 by Jordan *

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