Monday

March 30, 2015

March 30, 2015

Number of results: 31,196

**physics**

Q A man throws a ball weighing 500g vertically upwards witha speed of 10m/s. 1) what will be its initial momentum? 2) What would be its momentum at the highest point of his flight?
*November 11, 2011 by asd*

**Physics**

A ball of 0.5kg mass hits a wall at an angle of 30° and is then reflected making an angle of 90° with its original direction. if the duration of contact between the ball and the wall is 0.1s,calculate the force exerted on the wall. the initial and final velocities of ball are ...
*March 9, 2013 by Kinjal*

**Physics - momentum**

Two hockey pucks approach each other as shown in the figure below. Puck 1 has an initial speed of 22 m/s, and puck 2 has an initial speed of 14 m/s. They collide and stick together. Find the components along x and y of the initial velocities of both particles. v1xi = 19.1 m/s ...
*November 16, 2010 by J Velji*

**Physics**

A cannon ball is fired from ground level with a speed of 86.0 m/s at an angle of 32 deg. above the horizontal. A 8.5 m tall wall is located 265 m away from the cannon. By how much does the cannon ball clear the wall? In the previous problem, what is the speed of the cannon ...
*March 2, 2014 by Yarielis*

**Physics**

A(n) 0.42 kg softball is pitched at a speed of 12 m/s. The batter hits it back directly at the pitcher at a speed of 27 m/s. The bat acts on the ball for 0.016 s. What is the magnitude of the impulse imparted by the bat to the ball? Answer in units of N · s. What is the ...
*February 1, 2015 by Monica*

**Physics**

Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the collision?
*May 26, 2014 by Jojn*

**Physics**

Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the collision?
*May 27, 2014 by Abby*

**Physics**

Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the collision?
*May 27, 2014 by Abby*

**Physic **

A ball is thrown toward a cliff of height h with a speed of 28m/s and an angle of 60∘ above horizontal. It lands on the edge of the cliff 3.3s later. a) How high is the cliff? i got 26.7 m b) What was the maximum height of the ball? my answer here was 30 m C) What is the...
*October 22, 2014 by Please help me with the last question *

**math**

a ball is thrown vertically upward from the ground level with an initial velocity "Vo" - V sub zero a. derive a formula for the time at w/c the ball hit the ground b. use the formula to prove that the impact velocity by the ball is -Vo
*September 17, 2012 by justine*

**algebra math**

(QUEESTION 1) In view of the soccer fever, the PE department bought x identical soccer balls for $450.If the price of each ball was reduced by $3, they would have bought 5 more balls. (a) write down the price of each ball (b) write down the price of each ball if there was a ...
*May 21, 2012 by jackydrewls*

**physics**

A baseball (m = 148 g) approaches a bat horizontally at a speed of 43.8 m/s (98.0 mi/h) and is hit straight back at a speed of 48.4 m/s (108 mi/h). If the ball is in contact with the bat for a time of 1.08 ms, what is the average force exerted on the ball by the bat? Neglect ...
*July 25, 2013 by tcc*

**Physics**

A ball is thrown with initial velocity Vo=20.0 m/s from the top of a 50.0m tall building. Find the velocity Vg with which the ball strikes the ground. Find time Ttotal it takes for the ball to move to the ground.
*July 10, 2011 by Myyke*

**Physics AP**

A ball is thrown straight upward with a speed of +12 m/s. A) what's the ball's acceleration just after it is thrown? B) how much time does it take for the ball to rise to its maximum height? C) what's the approximate maximum height the ball reaches?
*September 15, 2012 by Anna*

**physics**

A 95 g tennis ball is traveling at 106 km/h when it bounces of a wall and travels in the opposite direction it came from at a speed of 88 km/h. a. Determine the impulse on the ball if the. (don’t forget that it is a vector) b. If the average force exerted on the ball by the ...
*January 22, 2012 by Fatima*

**physics**

A 95 g tennis ball is traveling at 106 km/h when it bounces of a wall and travels in the opposite direction it came from at a speed of 88 km/h. a. Determine the impulse on the ball if the. (don’t forget that it is a vector) b. If the average force exerted on the ball by the ...
*January 22, 2012 by Fatima*

**Physics (MOMENTUM)**

Please, help me answer this question. Two balls are moving in the same direction. Ball A has half the mass of ball B, and is moving at twice its speed. (a) Which ball has the greater momentum? (b) Which ball has greater kinetic energy? Thank you.
*May 2, 2013 by Kathy*

**Physics- Momentum**

A 170g cue ball is moving at 3.0 m/s when it strikes a 160g stationary numbered ball (object ball). After the collision the balls move off as shown. Determine the speed of the cue ball and the numbered (object) ball after the collision. The diagram illustrates the cue ball ...
*February 15, 2015 by Mysty*

**physics**

When a 58g tennis ball is served, it accelerates from rest to a speed of 45m/s. The impact with the racket gives the ball a constant acceleration over a distance of 44cm. What is the magnitude of the net force acting on the ball?
*February 12, 2012 by Natasha*

**Physics**

A bowling ball has a mass of 7 kg and a speed of 1.73 m/s. A baseball has a mass of 0.12 kg and a speed of 25.1 m/s. Which ball has the larger momentum? a. The bowling ball. b. More information needed c. The baseball. d. Both have the same momentum
*July 7, 2014 by Anonymous*

**algebra**

y=(v/u)x+(g)/(2(u^2))*x^2 where y is the object's vertical distance (in feet) above from where it was thrown x is the object's horizontal distance (in feet) away from where it was thrown and u is the objects' initial horizontal velocity v is the object's initial vertical ...
*July 19, 2013 by Geoff*

**Algebra 2**

a person throws a baseball into the air with an initial vertical velocity of 30 feet per second and then lets the ball hit the ground. The ball is released 5 feet above the ground. How long is the ball in the air?
*December 9, 2014 by Madison*

**Physics**

A 6.00 kg ball (ball 1), moving to the right at a velocity of +1.00 m/s on a frictionless table, collides head-on with a stationary 7.50 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 m/s ball 2 m/s...
*November 2, 2008 by Brandon*

**physics**

A(n) 0.42 kg softball is pitched at a speed of 12 m/s. The batter hits it back directly at the pitcher at a speed of 27 m/s. The bat acts on the ball for 0.016 s. What is the magnitude of the impulse imparted by the bat to the ball? Answer in units of N · s. 011 (part 2 of 2) ...
*February 1, 2015 by Kev*

**Health-Ms. Sue**

Coach Downey had his team practice bunting while working on basic fundamentals. Nearly all of the bunts were reaching the fielders so quickly that the base runners were easily thrown out before they could advance. Coach Downey emphasized better bunting fundamentals by having ...
*January 17, 2014 by Anonymous*

**Physics (ASAP PLEASE)**

Please, help me answer this question. Two balls are moving in the same direction. Ball A has half the mass of ball B, and is moving at twice its speed. (a) Which ball has the greater momentum? (b) Which ball has greater kinetic energy? Thank you
*May 3, 2013 by Kathy*

**physics**

a 7 kg ball is thrown into the air from ground level with an initial velocity of 24m/s. Determine the ball's maximum height. Use conservation of energy. help!!!
*November 16, 2014 by Isabelle*

**physics**

4. A ball is thrown so that it just clears a 3m fence 18m away. If it left the hand 1.5m above the ground and at an angle of 60° with the horizontal, what was the initial velocity of the ball?
*March 10, 2015 by steven*

**physics**

the tennis ball may leave the racquet on the serve with a speed of 65 m/s. If the ball's mass is 60 g, and it is in contact with the racquet for .030 s, what is the average force on the ball?
*January 31, 2011 by Sammy Palmisano*

**Physics**

A projectile is launched vertically from the surface of the Moon with an initial speed of 1130 m/s. At what altitude is the projectile's speed three-fourths its initial value?
*November 15, 2009 by Emily*

**Physics**

A projectile is launched vertically from the surface of the Moon with an initial speed of 1500. At what altitude is the projectile's speed one-half its initial value?
*April 28, 2012 by Turk*

**physics**

A projectile is launched vertically from the surface of the Moon with an initial speed of 1210 m/s. At what altitude is the projectile's speed two-fifths its initial value?
*April 25, 2014 by Cam*

**Physics**

A 0.0600 kg tennis ball, moving with a speed of 2.50 m/s, has a head-on collision with a 0.0900 kg ball initially moving away from it at a speed of 1.00 m/s. Assuming a perfectly elastic collision, what is the speed and direction of each ball after the collision? -I was given ...
*February 3, 2010 by Ashley*

**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 ...
*March 15, 2007 by Jean*

**phs**

a soccer player kicks a 0.5 kg stationary ball with a force of 50 newtons .what is the force on the players foot?
*December 18, 2012 by cheyanne*

**Physics**

What is the force at which a bowling ball when it sticks the pins given the final speed of the bowling ball. Now account for friction and angular rotation of the ball
*July 3, 2012 by Ron*

**Science, Physics, math, calculus**

Pool players often pride themselves on their ability to impart a large speed on a pool ball. In the sport of billiards, event organizers often remove one of the rails on a pool table to allow players to measure the speed of their break shots (the opening shot of a game in ...
*November 24, 2013 by James*

**Physics**

A tennis ball with a velocity of 24.4 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 16 m/s. If the ball is in contact with the wall for 0.013 s, what is the average acceleration of the ball while ...
*September 27, 2012 by Diego*

**Physics**

A child tosses a baseball to his siter, who is hanging out the window of an apartment building. The ball's initial velocity is 18 m/s upward. (Ignore any horizontal motion) 1. How long will it take for the ball to reach its maximum height? 2. The sister catches the ball 3.0 ...
*January 28, 2012 by DENISE*

**PHYSICS**

During a tennis match a player serves the ball at 23.6 m/s with the center of the ball leaving the raquet horizontally 2.37m abovet eht court surface. The net is 12m away and .9m high. When the ball reaches the net a) does the ball clear it and b) what is the distance between ...
*October 24, 2006 by Bobby*

**Math**

The horizontal range, R, is modeled by this formula: R(x)=(v^2*sin2(x))/32 The initial velocity (v) is 90ft per second. The ball is pitched at an angle of x degrees with the horizontal. When x=26 degrees, the ball travels 200ft. At what other value of x will the ball travel ...
*June 16, 2012 by Amber*

**physics**

You and a friend stand on a snow-covered roof. You both throw snowballs from an elevation of 18 m with the same initial speed of 11 m/s, but in different directions. You through your snowball downward, at 40° below the horizontal; your friend throws her snowball upward, at 40...
*September 28, 2014 by Dina*

**Physics**

A ball is thrown upward in two dimensions with an initial speed of 17 Zlugs per mega handle(made up) near the surface of the planet earth. What will be the y component of the balls velocity at the peak of its trajectory?
*February 17, 2014 by Michelle*

**Physics**

A ball is thrown upward in two dimensions with an initial speed of 17 Zlugs per mega handle(made up) near the surface of the planet earth. What will be the y component of the balls velocity at the peak of its trajectory?
*February 19, 2014 by Michelle*

**Physics**

A ball is thrown upward in two dimensions with an initial speed of 17 Zlugs per mega handle(made up) near the surface of the planet earth. What will be the y component of the balls velocity at the peak of its trajectory?
*February 20, 2014 by Michelle*

**physics please 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 2, 2010 by jason*

**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*

**physics**

You are playing right field for the baseball team. Your team is up by one run in the bottom of the last inning of the game when a ground ball slips through the infield and comes straight toward you. As you pick up the ball 62 m from home plate, you see a runner rounding third ...
*March 5, 2012 by Haley*

**physics!!****

In a typical golf swing, the club is in contact with the ball for about 0.0015 s. If the 45 g ball acquires a speed of 75 m/s, estimate the magnitude of the force exerted by the club on the ball.
*October 12, 2008 by kelsey*

**physics**

In a typical golf swing, the club is in contact with the ball for about 0.0010 . If the 45- ball acquires a speed of 57 , estimate the magnitude of the force exerted by the club on the ball.
*October 22, 2010 by Ashley*

**physics**

In hitting a stationary pool ball with the mass of 170 g, a billiards player gives the ball impulse of 6.0 N-s. At what speed will the pool ball move toward the hole?
*December 16, 2010 by Robert*

**physics**

In a typical golf swing, the club is in contact with the ball for about 0.0010s. If the 45-g ball acquires a speed of 41 m/s, estimate the magnitude of the force exerted by the club on the ball.
*March 29, 2011 by Jason*

**physics**

You throw a ball downwards with a speed of 10 m/s. It hits the ground 4 meters below from where you threw it. How long is the ball in the air and what is the ball’s velocity just before it hits?
*July 5, 2011 by Kate*

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

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

**algebra**

a ball is thrown downward from the too of 110 ft bldg with an initial velocity of 14ft per second. the height of ball h after t seconds is given by the equation h = -16t^2-14t +110. how long after ball is thrown will it hit the ground
*December 15, 2011 by kai*

**algebra**

a ball is thrown downward from the too of 110 ft bldg with an initial velocity of 14ft per second. the height of ball h after t seconds is given by the equation h = -16t^2-14t +110. how long after ball is thrown will it hit the ground
*December 15, 2011 by kai*

**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¢ª above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air resistance...
*May 28, 2012 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¢ª above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air resistance...
*May 28, 2012 by Hannah*

**calculus**

A ball is thrown vertically upwards from a height of 6 ft with an initial velocity of 60 ft per second. How high will the ball go? Note that the acceleration of the ball is given by a(t)= 32 feet per second per second.
*December 6, 2012 by miranda*

**AP Physics**

A person on a trampoline bounces straight upward with an initial speed of 4.7m/s . What is the magnitude of the person's speed when she returns to her initial height?
*August 17, 2011 by Vova*

**AP Physics**

A person on a trampoline bounces straight upward with an initial speed of 4.7m/s . What is the magnitude of the person's speed when she returns to her initial height?
*August 17, 2011 by Vova*

**AP Physics**

A person on a trampoline bounces straight upward with an initial speed of 4.7m/s . What is the magnitude of the person's speed when she returns to her initial height?
*August 17, 2011 by Vova*

**Physics**

A ball is thrown vertically upward with a speed of 48.5m/s. What is the ball's velocity after 1.50s? b) What is the ball's height after 1.5s?
*September 29, 2012 by joane *

**Physics**

A ball is thrown vertically upward with a speed of 48.5m/s. What is the ball's velocity after 1.50s? ** B). what is the ball's height after 1.5 s?
*September 30, 2012 by joane *

**Physics **

Suppose that the gravitational acceleration on a certain planet is only 3.1 m/s2. A space explorer standing on this planet throws a ball straight upward with an initial velocity of 25 m/s. (a) What is the velocity of the ball 4 seconds after it is thrown? m/s (b) How much time...
*February 13, 2013 by Jordan *

**Physics**

Suppose that the gravitational acceleration on a certain planet is only 3.1 m/s2. A space explorer standing on this planet throws a ball straight upward with an initial velocity of 35 m/s a) What is the velocity of the ball 4 seconds after it is thrown? m/s (b) How much time ...
*September 7, 2013 by Heather*

**physics**

I have a couple physics questions I need help with please! If you could show me step-by-step directions, I'd really appreciate it! A boat with a horizontal tow rope pulls a water skier. She skis off to the side, so the rope makes an angle of 15.0 degrees with the forward ...
*April 16, 2011 by physicsclass*

**physics**

2. A ball is thrown vertically upward from the 15m level in an elevator shaft with an initial velocity of 20 m/s. At the same instant an open-platform elevator passes the 6m level, moving upward with a constant velocity of 2 m/s. Determine a. When and where the ball will hit ...
*December 20, 2012 by anshuman kumar*

**Physics**

A baseball is projected horizontally from the top of a building with an initial speed of 15 m/s. The ball strikes the ground 25 m from the base of the building. a. How long will it be in the air? b. How tall is the building?
*November 2, 2013 by Tsunayoshi*

**physics**

A baseball is hit into the air at an initial speed of 35.5m/s at an angle of 49.9 degrees above the horizontal. At the same time the center fielder starts running away from the batter and catches the ball 0.877m above the level at which it was hit. If the center fielder is ...
*September 12, 2008 by steve*

**math**

after ploting graph for h = 1.1 + 7t - 5t^2 for interval t = 0 to t = 2. i catch a ball again when it is at height at 1.1m given the velocity of ball v in m/s given by v = 7 - 10t, find the speed of the ball when it reaches my hand.
*April 13, 2010 by dev*

**Physics**

A tennis ball may leave the racket on a serve by a top player with a speed of 45.0 m/s. If the ball's mass is 0.063 kg, and it is in contact with the racket for 0.030 s, what is the average force (in newtons) on the ball?
*July 12, 2013 by Zach*

**math**

The velocity(in feet per second) of a bouncing ball was recorded every second. The table shows the velocity for each second. Time(sec):|1|2|3|4|5| Velocity(ft/sec)|-15|-6|2|10|-11| What is the average velocity of the bouncing ball over 5 seconds? What is the highest record ...
*October 28, 2013 by Kai-Cin*

**Physics**

Paige and Julia are playing volleyball. Paige is in spiking position when Julia gives her the perfect set. The 0.226-kg volleyball is 2.29 m above the ground and has a speed of 1.06 m/s. Paige spikes the ball, doing 9.89 J of work on it. Determine a) the total mechanical ...
*September 13, 2013 by Madi*

**physics**

A 0.50 kg ball that is tied to the end of a 1.1 m light cord is revolved in a horizontal plane with the cord making a 30° angle, with the vertical (a) Determine the ball's speed. (b) If, instead, the ball is revolved so that its speed is 4.0 m/s, what angle does the cord make ...
*November 22, 2010 by tj*

**Physics**

You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.5 m above the ground, and it is moving at a speed of 8.0 m/s. (a) How much time does it take for the tennis ball to reach its maximum height? (b) What is the maximum height above ...
*September 6, 2014 by John*

**Physics**

a 1.5kg cannon is mounted on top of a 2.0kg cart and loaded with a 52.7 gram ball. The cannon, car, and ball are moving forward with a speed of 1.27m/s. The cannon is ignited and launches a 52.7 gram ball forward with a speed of 75m/s. Determine the post-explosion velocity of ...
*April 29, 2012 by Sarah*

**Physics**

a 1.5kg cannon is mounted on top of a 2.0kg cart and loaded with a 52.7 gram ball. The cannon, car, and ball are moving forward with a speed of 1.27m/s. The cannon is ignited and launches a 52.7 gram ball forward with a speed of 75m/s. Determine the post-explosion velocity of ...
*April 30, 2012 by Sarah*

**Physics**

5. The ball launcher in a pinball machine has a spring that has a force constant of 1.20 N/cm . The surface on which the ball moves is inclined 10.0° with respect to the horizontal. The spring is initially compressed 5.00 cm. Find (a) the launching speed of a 100-g ball when ...
*February 1, 2013 by John Tucker*

**mircoeconomic**

For each of the following situations, decide whether the bundle Lakshani is thinking about consuming is optimal or not. If it is not optimal, how could Lakshani improve her over-all level of utility? That is, determine which good she should spend more on and which good should ...
*November 18, 2008 by lisa*

**physics**

A ballplayer standing at homeplate hits a baseball that is caught by another player at the same height above the ground from which it was hit. The ball is hit with an initial velocity of 23.0 m/s at an angle of 54.0° above the horizontal. How high will the ball rise? . m ...
*February 3, 2013 by Abdul*

**Physics **

At serve, a tennis player aims to hit the ball horizontally. What minimum speed is required for the ball to clear the 0.91 m high net about L = 15.1 m from the server if the ball is "launched" from a height of H = 2.55 m? How far from the end of the service box (which is a ...
*February 5, 2012 by Andy*

**physics**

A baseball of mass 250g, pitched with a speed of 40m/s, is caught by a catcher, whose glove moves backward 0.25m while stopping the ball. a)what is the kenetic energy of the ball? b)how much work did the catcher's glove do on the ball? c) what was the average stopping force on...
*December 3, 2009 by Alemu*

**Physics**

A tennis ball is thrown horizontally from an elevation of 20.60 m above the ground with a speed of 19.0 m/s. (a) Where is the ball after 2.00 s for the horizontal and vertical position? (b) If the ball is still in the air, how long before it hits the ground? If the ball is ...
*September 13, 2012 by Drew*

**Physics**

Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and knows that the fastest he can ...
*February 13, 2015 by Breauna*

**physics**

A cannonball is fired horizontally from the top of a cliff. The cannon is at height = 70.0 above ground level, and the ball is fired with initial horizontal speed . Assume acceleration due to gravity to be = 9.80 .
*February 4, 2011 by Anonymous*

**Physics**

A ball is thrown straight up and reaches a maximum height of 6.71 m. What was its initial speed? The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m/s please give right answer and explain how you got it, thanks !
*September 20, 2012 by Melanie*

**physical**

Problem 1 A goalkeeper kicks a ball of mass 400 g in the air, and reaches a position of height 15.9 m above the ground corresponding to a horizontal distance 19.7 m from its initial position. During its flight, the ball experiences a horizontal friction force of 3 N from a ...
*December 8, 2011 by sumi*

**physical**

Problem 1 A goalkeeper kicks a ball of mass 400 g in the air, and reaches a position of height 15.9 m above the ground corresponding to a horizontal distance 19.7 m from its initial position. During its flight, the ball experiences a horizontal friction force of 3 N from a ...
*December 8, 2011 by sumi*

**physics**

A boy throws a ball up into the air with a speed of 12.3 m/s. The ball has a mass of 0.25 kg. How much gravitational potential energy will the ball have at the top of its flight? (Assume there is no air resistance.)
*May 29, 2013 by Anonymous*

**physics**

A frictionless plane is 15m long and inclined at 39.8 degrees. A sled starts at the bottom with an initial speed of 6.46m/s up the incline. When it reaches the point at which it momentarily stops, a second sled is released from the top of this incline with an initial speed vi...
*December 29, 2010 by sam*

**physics**

Imagine that you throw a ball vertically upwards from the rooftop of a building. The ball abandons your hand at a point that has the same height as the railway of the rooftop with an ascending speed of 15m/s, been left in free falling. Coming down the ball crosses the railway...
*October 10, 2014 by chantal*

**physics**

A 0.200 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. (a) What is the mass of the second ball? (b) What fraction of the original kinetic energy (KE/KE) gets ...
*November 9, 2006 by jim*

**Physics**

A batted baseball is hit with a velocity of 47.3 m/s, starting from an initial height of 8 m. Find how high the ball travels in two cases: (a) a ball hit directly upward and (b) a ball hit at an angle of 70° with respect to the horizontal. Also find how long the ball stays in ...
*September 12, 2011 by Need Help*

**Math**

A ball is thrown downward from the top of a 100-foot building with an initial velocity of 14 feet per second. The height of the ball h after t seconds is given by the equation h=-16t^2-14t+100. How long after the ball is thrown will it strike the ground?
*April 28, 2014 by Rachel*

**cpcc**

A frictionless plane is 10.0 m long and inclined at 33.0°. A sled starts at the bottom with an initial speed of 4.30 m/s up the incline. When the sled reaches the point at which it momentarily stops, a second sled is released from the top of the incline with an initial speed ...
*September 27, 2010 by thomas*

**College Physics**

Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and knows that the fastest he can ...
*September 18, 2011 by Nikki*

**physic**

A ball is thrown toward a cliff of height h with a speed of 28m/s and an angle of 60∘ above horizontal. It lands on the edge of the cliff 3.3s later. a) How high is the cliff? i got 26.7 m b) What was the maximum height of the ball? my answer here was 30 m C) What is the...
*October 21, 2014 by sara*

**physic**

A ball is thrown toward a cliff of height h with a speed of 28m/s and an angle of 60∘ above horizontal. It lands on the edge of the cliff 3.3s later. a) How high is the cliff? i got 26.7 m b) What was the maximum height of the ball? my answer here was 30 m C) What is the...
*October 21, 2014 by emily*

**Physics**

A uniform, spherical bowling ball of mass m and radius R is projected horizontally along the ﬂoor at an initial velocity v0 = 6.00 m/s. The ball is not rotating initially, so ω0 = 0. It picks up rotation due to (kinetic) friction as it initially slips along the &#...
*November 19, 2008 by Samantha*

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