Thursday

April 2, 2015

April 2, 2015

Number of results: 21,483

**Algebra**

I am reposting to correct a mistake. I forgot to add a decimal point. An object is fired vertically upward with an initial speed of 68.6 meters/second. After t seconds, the height is shown by y = -4.9 t^2 + 68.6 t meters. Given that this object has an initial speed of 68.6 m/s...
*May 19, 2013 by Amy*

**physics**

using a powerful air gun, a steel ball is shot vertically upward with a velocity of 80 m/s, followed by another shot after 5 seconds. find the initial velocity of the second ball to meet the first ball 150 m from the ground.
*January 25, 2014 by Astro*

**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*

**Algebra 2**

If an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s(where h and s are in ft, t is in seconds and v is in ft/sec) A package is thrown downward with an initial velocity of -...
*April 29, 2012 by Kelsey*

**Physic**

a bullet is fired from at a shooting range. The bullet hits the ground after .32 seconds. How far did it travel horizontally and vertically in this time if it was fired at a velocity of 1100 m/s?
*February 11, 2014 by Marie*

**physics**

A man fires a rock of a slingshot directly upward.The rock has an initial velocity of 15m/s.How long will it take for the rock to return to the level he fired it at?
*April 4, 2013 by Shazz*

**PHYSICS!**

A projectile is fired with an initial speed of 32.5 m/s at an angle of 61.4° above the horizontal. The object hits the ground 7.55 s later. What is the absolute value of the difference in height between the launch point and the point where the projectile hits the ground?
*February 14, 2009 by JJ*

**PHYSICS!**

A projectile is fired with an initial speed of 32.5 m/s at an angle of 61.4° above the horizontal. The object hits the ground 7.55 s later. What is the absolute value of the difference in height between the launch point and the point where the projectile hits the ground?
*February 14, 2009 by JJ*

**Physics**

A ball is thrown vertically upward and comes back down. Total time of 7.95 s in air. What is its initial velocity? Neglect air resistance.
*September 19, 2012 by Jack Li*

**physics**

A projectile is shot from the edge of a cliff h = 125 m above ground level with an initial speed of v0 = 145 m/s at an angle of 37.0° with the horizontal. (a) Determine the time taken by the projectile to hit point P at ground level. b) Determine the range X of the projectile ...
*October 16, 2014 by zg*

**physical science**

A tennis ball is thrown vertically upward wih an initial velocity of 8.0m/s. A) What will its speed be wheen it returns to its tarting point? B) How long will it take for it to reach its starting poing?
*April 16, 2009 by Taylor*

**physics**

A projectile is launched with an initial speed of 70 m/s at an angle of 35° above the horizontal on flat ground. Neglect air friction. A)What is the projectile's velocity at the highest point of its trajectory?
*September 17, 2012 by Cyrus*

**physics**

Your projectile launching system is partially jammed. It can only launch objects with an initial vertical velocity of 42.0 m/s, though the horizontal component of the velocity can vary. You need your projectile to land 214 m from its launch point. What horizontal velocity do ...
*October 22, 2012 by Lopez*

**College Algebra**

Show all work. A projectile is fired from a cliff 100 ft above the water at an inclination of 45 degrees to the horizontal, with a muzzle velocity of 260 ft/second. The height of the projectile above the water is given by h(x)= ((-32x^2)/(260)^2)+x+100, where x is the ...
*October 24, 2011 by Anonymous*

**Physics (projectile motion)**

Projectile fired in earths gravitational field at a height of of 0.90m above ground level, with a horizontal velocity of 9m/s. How far will the ball fly before hitting the ground? How long will the ball stay in the air?
*November 2, 2014 by Darrien*

**physics**

Assume a projectile is launched from ground height over a flat plane, at an angle of 50 degrees above the horizontal with an initial speed of 100 m/s. What is the initial velocity of the projectile parallel to the ground (in the x direction) and perpendicular to the ground (in...
*September 8, 2014 by john*

**Physics**

the acceleration due to gravity on the moon is 1/6 that on earth. For a projectile with an initial velocity of 15m/s upward what would be the maximum height and total time of flight on the moon and on the earth?
*September 18, 2014 by Angie *

**Physics**

Maria throws an apple vertically upward from a height of 1.3m unit an initial velocity of velocity of 12.4m/s 1. will the apple reach a friend in a tree house 5.3m above the ground. 2. If the apple is not caught, how long will the apple be in the air before it hits the ground.
*February 6, 2013 by Jessica*

**physics**

two balls of different masses are thrown vertically upward with same initial velocity .calculate the ratio of ratio of maximum height attained by them
*May 22, 2012 by monica*

**science**

A rock is thrown vertically upward with an initial speed of 100 ft/s. At the same instant another rock is thrown vertically downward from the top of a 280 ft cliff with an initial speed of 40 ft/s. Neglecting air friction,
*January 9, 2013 by Anonymous*

**physics**

A 5.88 g bullet is fired vertically into a 0.9 kg block of wood. The bullet gets stuck in the block, and the impact lifts the block 0.87 m up. (That is, the block — with the bullet stuck in it — rises 0.87 m up above its initial position, and then falls back down.) Given g = 9...
*August 9, 2011 by James*

**Dynamics**

A French artillerist, Captain A. Le Duc, developed an empirical formula for the velocity of a projectile in terms of the distance traveled by the projectile in the bore. For a 155-mm gun this equation is v = 3309s /(70 + s) where s is the distance traveled in the bore in ...
*January 19, 2011 by stan*

**physics i really need help :(**

A projectile is fired with an initial speed of 61.3m/s at an angle of 31.5° above the horizontal on a long flat firing range. a)Determine the maximum height reached by the projectile. b)Determine the total time in the air. c)Determine the total horizontal distance covered (...
*November 24, 2012 by juanita*

**physics**

A bomb is dropped from a height of 40m.simultaneously and vertically below it,a second bomb is fired vertically with a velocity of 20m/s.At what distance from the ground do they collide
*January 30, 2012 by ceasar*

**Calculus**

Use a(t)=-32 ft/second squared as the acceleration due to gravity. A ball is thrown vertically upward from the ground with an initial velocity of 96 feet per second. How high will it go?
*February 9, 2015 by Anonymous*

**Physics**

Your projectile launching system is partially jammed. It can only launch objects with an initial vertical velocity of 42.0 m/s, though the horizontal component of the velocity can vary. You need your projectile to land 211 m from its launch point. What horizontal velocity do ...
*September 13, 2014 by Alexandra *

**physics**

A body is thrown vertically upward from the top of the cliff 50m high. Has the body reaches the ground in 10. What is the initial velocity of body?
*August 21, 2010 by Anonymous*

**physics**

A body is thrown vertically upward from the top of the cliff 50m high. Has the body reaches the ground in 10. What is the initial velocity of body?
*August 21, 2010 by Anonymous*

**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*

**Quantative Reasoning College Freshman**

Using the formula y=-16t^2+vt+h help me with this word problem : A firework rocket is fired straight up into the air with an initial velocity of v=192ft/sec From the top of an apartment building h=48ft off the ground. The firework will explode when it reaches the peak (maximum...
*April 5, 2013 by Bonni*

**calculus**

if a ball is thrown vertically upward with an initial velocity of 48 ft/s, then its height, s, after t seconds is given by s(t)= 48t-16t^2. a) what is the velocity of the ball after 1 second? b) when does the ball hit the ground? c) with what velocity does the ball hit the ...
*April 8, 2013 by moises*

**physics 203**

a projectile is thrown with initial speed v0=25.0m/2 at an initial angle with the horizontal ANGLE=45 degrees. a. find the time when the projectile is at the maximum height. b. find the position(x,y) at the maximum height. c. at time T, find the components of the acceleration ...
*February 22, 2013 by ash*

**physics**

Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are different. Suppose that the...
*August 26, 2012 by Anonymous*

**Physics**

Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are different. Suppose that the...
*August 31, 2012 by Marissa*

**physics**

Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are different. Suppose that the...
*September 5, 2012 by Tracie *

**Physics**

A ball thrown vertically upward is caught by the thrower after 20.0 s. FInd (a)the initial velocity and (b) the maximum height it reaches. All I am given is time. How am I suppose to find (a) and (b)?
*September 12, 2007 by Anonymous*

**algebra word problem**

A projectile is launched upward from a height of 960 feet with an initial velocity of 64 ft/s. The equation gives the height h after t seconds. Find the number of seconds until it returns to the ground.
*January 3, 2015 by ljpoole*

**algebra word problem**

A projectile is launched upward from a height of 960 feet with an initial velocity of 64 ft/s. The equation gives the height h after t seconds. Find the number of seconds until it returns to the ground.
*January 3, 2015 by ljpoole*

**Physics**

A. Consider the motion of a projectile. It is fired at t= 0. Its initial speed is 12 m/s and its initial projection angle is 50◦ from the horizontal. The acceleration of gravity is 9.8 m/s^2. What is the maximum height,h, of its trajectory? Answer in units of m. B. ...
*February 19, 2014 by Fabricus*

**physics**

A ball thrown vertically upward is caught by the thrower after 2 seconds. Find the initial velocity of the ball and the maximum height the ball reaches???!!
*September 18, 2008 by mb*

**physics**

a body is thrown vertically upward return to the earth in 3sec. (a)what was the initial velocity of the body (b)what height did the body reach? neglect the resistance of air.
*June 14, 2011 by pavatharani*

**physics**

A tennis ball is hit vertically upward and returns 6 sec later calculate. A) the greatest height reached by the ball. B) the initial velocity of the ball .
*October 2, 2011 by Anonymous*

**physics**

a projectile is thrown from the ground with an initial velocity of 20.0m/s at an angle of 40 degrees above the horizontal, find the maximum height,the time required to reach its maximum height,c) it velocity at the top of the trajectory.d) the range of the projectile,e) the ...
*February 19, 2015 by daniel*

**Phsyics**

A projectile is fired with an initial speed of 61.3m/s at an angle of 44.2∘ above the horizontal on a long flat firing range. (a) Determine the maximum height reached by the projectile. (b) Determine the total time in the air. (c) Determine the total horizontal distance ...
*September 15, 2013 by Tucker*

**algebra**

The height in feet of a projectile with an initial velocity of 32 feet per second and an initial height of 48 feet is a function of time in seconds given by h(t) = −16t2 + 32t + 48. (a) Find the maximum height of the projectile. ft (b) Find the time t when the projectile...
*December 12, 2014 by Barb*

**physics**

A bullet fired vertically upwards from a gun held 2m above the ground reaches its maximum height in 4sec, calculate its initial velocity and the total distance the bullet travels by the time it hits the ground
*December 9, 2010 by Saul*

**science**

A projectile is fired with an initial speed of 120m.s' at an angle of 60' above the horizontal from the top of a 50m high cliff. (a) determine the maximum height(above the cliff) reached by the projectile (b) how long it takes to fall to the ground from the max. height?. ...
*February 9, 2011 by Mykmoloko*

**science**

A projectile is fired with an initial speed of 120m.s' at an angle of 60' above the horizontal from the top of a 50m high cliff. (a) determine the maximum height(above the cliff) reached by the projectile (b) how long it takes to fall to the ground from the max. height?. ...
*February 9, 2011 by Mykmoloko*

**physics**

A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
*September 16, 2008 by Derek*

**physics**

A cannon sends a projectile towards a target 1390m away. The initial velocity makes an angel of 39 degrees with the horizontal. The target is hit. The acceleration of gravity is 9.8m/s^2. what is the magnitude of the initial velocity?
*September 19, 2011 by Anonymous*

**physics**

A projectile is fired horizontally from a gun that is 97.0 m above flat ground, emerging from the gun with a speed of 250 m/s. (a) How long does the projectile remain in the air? s (b) At what horizontal distance from the firing point does it strike the ground? m (c) What is ...
*December 13, 2008 by johnny*

**physics **

a ufo is trying to escape by flying at the constant velocity of 70m/s at an upward angle of 2 degrees. it passes directly over you at a height of 40 m. at the instant it is directly above you you attempt to shoot it down by launching a projectile. what is the lowest launch ...
*September 19, 2013 by mary*

**Physics**

A projectile is launched upward at 26m/s at 30 degrees from the horizontal. The whole path of the projectile takes place over level ground. How much time will the projectile be in the air?
*September 28, 2014 by Chelsea*

**Physics 221**

1. throughout a time interval, while the speed of a particle increases as it moves along the x axis, its velocity and acceleration might be: A. positive and negative, respectively B. negative and positive, respectively C. negativa and negative, respectively D. negative and ...
*August 26, 2007 by Joshua*

**physics**

A projectile is fired with an initial speed of 26.0 m/s at an angle of 30.0 above the horizontal. the object hits the ground 9.00 s later
*October 5, 2011 by Anonymous*

**physics**

a low velocity mortar round is fired upward at an angle of 50° from the horizontal with a launch velocity of 40 m/s
*October 3, 2011 by jared*

**math**

A soccer player kicks a ball and gives it an initial upward velocity of 47 feet per second. If everyone waits for the ball to bounce, how long will it be in the air? (Use the vertical motion formula, h= -16tsquared + vt + c, where h is the height of the ball will be at time t...
*April 29, 2013 by kelly*

**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*

**Math**

Fireworks are fired at an angle of 82degrees with the horizontal. They are expected to explode about 100 m in the air, 4.8 secs after they are fired. What is the initial velocity of a shell fired from ground level. I think I have to find the vertical and horizontal components ...
*November 1, 2010 by KC*

**projectile motion**

a bullet is fired horizontally with an initial velocity of 600 m/s at a target located 300 m from the rifle. how much time is required for the bullet to reach the target? (B) using the approximate value of g=10 m/s squared how far does the bullet fall in this time?
*September 21, 2012 by us*

**Physics **

A projectile is fired from ground level with a speed of 40 m/s at an angle of 30 degrees and hits a building 100m away. What is the time of flight of the projectile? How high above ground does the projectile hit the building? What is the speed of the projectile just before it ...
*February 5, 2012 by Krystal*

**mit physics**

A spherical non-rotating planet (with no atmosphere) has mass m 1= 6 ×10 24 kg and radius r 1= 9000 km. A projectile of mass m 2≪ m 1 is fired from the surface of the planet at a point A with a speed v A at an angle α=30 ∘ with respect to the radial direction...
*December 6, 2013 by juanpro*

**phisics**

A projectile is fired horizontally from a gun that is 45m above flat ground, emerging from the gun with speed 250m/s How long does the projectile remain in the air? At what horizontal distance from the firing point does it strike the ground?.What is the magnitude of the ...
*October 10, 2011 by Shanice*

**Physics**

A. 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 at an angle θ with respect to the horizontal. Let the building be 50.0...
*September 9, 2011 by Awonah*

**physics**

a stone is from the top of a tower 300m high and at the same time another stone is projected vertically upward with initial velocity 75m/s. calculate when and where the two stone meet
*April 21, 2011 by irna*

**physics**

a stone is from the top of a tower 300m high and at the same time another stone is projected vertically upward with initial velocity 75m/s. calculate when and where the two stone meet
*April 23, 2011 by irna*

**Physics**

A ball is thrown vertically upward from a window with an initial velocity of 10m/s. if it hits the ground below the window 5.0s later, what is the height of the window...can you tell me the steps on how to do this please...
*January 19, 2013 by Luellen*

**Physics**

Someone posted the question below, stating that they knew the answer to part A but needed help with part B. Well even with the answer for A, I can't figure it out! Can you take a step back from the question below to show me the steps for solving part A? I've been working on ...
*October 14, 2008 by Anna*

**college algebra**

a rocket is fired upward from some initial distance above the ground. Its height in feet, h,above the ground, t seconds after it is fired, is given by h=-16t^2+32t+560.
*April 13, 2014 by Davone *

**physics help**

A spherical non-rotating planet (with no atmosphere) has mass m1= 5 ×1024 kg and radius r1= 8000 km. A projectile of mass m2≪m1 is fired from the surface of the planet at a point A with a speed vA at an angle α=30∘ with respect to the radial direction. In its ...
*December 8, 2013 by Anonymous*

**Physics**

A ship maneuvers to within 2500 m of an island's 1800 m high mountain peak and fires a projectile at an enemy ship 610 m on the other side of the peak, as illustrated in Figure 3-29. If the ship shoots the projectile with an initial velocity of v = 256 m/s at an angle of θ...
*February 27, 2012 by Shawn*

**physics**

a projectile is fired at an angle of 60 degrees with the horizontal and with the initital velocity of 80 m/s. What is the time of flight?
*April 12, 2012 by Anonymous*

**physics**

A projectile is fired at an upward angle of 45 degrees from the top of a 265 m cliff with a speed of 350 m/s. What will be it's speed when it strikes the ground below?
*October 26, 2010 by jessica*

**Math**

11. A rocket is fired upward from some initial height above the ground. Its height h in feet above the ground t seconds after it is fired is given by h = -16t2 + 48t +448. (i) What is its initial height? __________ ft. (ii) What is its maximum height? ___________ ft. (iii) How...
*October 3, 2011 by Alyson*

**physics**

A rifle allowed a bullet fired with an initial horizontal velocity to travel 76.0 m while only falling a distance of 0.40 m. What was the initial x-velocity of the bullet? Round your answer to 2 decimal places.
*November 11, 2012 by Sara*

**physical**

Baseball of 0.15 kg is thrown upward at an initial velocity of 35 m/s. tow second later a 20 g bullet is fired at 250 m/s into the rising baseball . how high will the combined bullet and baseball rise.
*December 6, 2014 by mohamed*

**Science**

Baseball of 0.15 kg is thrown upward at an initial velocity of 35 m/s . tow seconds later a 20 g bullet is fired at 250 m/s into the rising baseball . How high will the combined bullet and baseball rise.
*December 6, 2014 by Ssn*

**science**

Baseball of 0.15 kg is thrown upward at an initial velocity of 35 m/s . tow seconds later a 20 g bullet is fired at 250 m/s into the rising baseball . How high will the combined bullet and baseball rise
*December 7, 2014 by ssn*

**phys**

a projectile is launched at 35 degrees above the horizontal with an initial velocity of 120m/s. What is the projectile's speed 3 seconds later? Figure the new vertical velocity at t=3. then the speed as equal to sqrt(Vv^2+ Vh^2) The other way to do this is figure how high it ...
*June 19, 2006 by slien*

**Physics**

An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object?
*September 15, 2008 by Eve*

**Physics**

An object is thrown vertically and has an upward velocity of 5 m/s when it reaches three fourths of its maximum height above its launch point. What is the initial (launch) speed of the object?
*May 18, 2012 by James*

**Physics**

An object is thrown vertically and has an upward velocity of 5 m/s when it reaches three fourths of its maximum height above its launch point. What is the initial (launch) speed of the object?
*May 18, 2012 by James*

**Classical Mechanics Physics**

A spherical non-rotating planet (with no atmosphere) has mass m1= 3 ×1024 kg and radius r1= 8000 km. A projectile of mass m2≪m1 is fired from the surface of the planet at a point A with a speed vA at an angle α=30∘ with respect to the radial direction. In its ...
*December 6, 2013 by Anonymous*

**Physics Classical Mechanics**

A spherical non-rotating planet (with no atmosphere) has mass m1= 4 ×1024 kg and radius r1= 5000 km. A projectile of mass m2≪m1 is fired from the surface of the planet at a point A with a speed vA at an angle α=30∘ with respect to the radial direction. In its ...
*December 8, 2013 by Mary*

**Physics**

The launching mechanism of a toy gun consists of a spring of unknown spring constant, as shown in Figure P5.33a. If its spring is compressed a distance of 0.140 m and the gun fired vertically as shown, the gun can launch a 24.0 g projectile to a maximum height of 26.0 m above ...
*June 16, 2011 by Sarah*

**math**

If a projectile is launched from a platform 30 feet high with an initial velocity of 128 feet per second, then the height of the projectile at t seconds is given by s(t) = –16t2 + 128t + 30 feet. (a) At what time does the projectile attain its maximum height? Show some work. (...
*November 9, 2010 by Math is HARD*

**College Math**

An object is projected vertically upward with an initial velocity of v0 ft/sec, and its distance s(t) in feet above the ground after t seconds is given by the formula s(t) = −16t^2 + v0t. (a) If the object hits the ground after 8 seconds, find its initial velocity v0. v0...
*November 10, 2014 by Kyle *

**physics**

The launching mechanism of a toy gun consists of a spring of unknown spring constant, as shown in the figure below. If the spring is compressed a distance of 0.160 m and the gun fired vertically as shown, the gun can launch a 21.0-g projectile from rest to a maximum height of ...
*March 21, 2013 by Anonymous*

**science**

The projectile is fired at an angle of 45 degree to the horizontal with an initial speed of 100 feet per second. Show work.
*March 14, 2011 by kasey kim*

**Physics**

A projectile of mass 0.377 kg is shot from a cannon, at height 6.6 m, as shown in the figure, with an initial velocity vi having a horizontal component of 6.1 m/s. The projectile rises to a maximum height of y above the end of the cannon’s barrel and strikes the ground a ...
*September 23, 2014 by Bob*

**Physics**

A ship maneuvers to within 2500 m of an island's 1800 m high mountain peak and fires a projectile at an enemy ship 610 m on the other side of the peak, as illustrated in Figure 3-29. If the ship shoots the projectile with an initial velocity of v = 248 m/s at an angle of θ...
*March 22, 2013 by Nicola*

**Physics**

A ship maneuvers to within 2500 m of an island's 1800 m high mountain peak and fires a projectile at an enemy ship 610 m on the other side of the peak, as illustrated in Figure 3-29. If the ship shoots the projectile with an initial velocity of v = 248 m/s at an angle of θ...
*March 22, 2013 by Nicola*

**MATH**

A projectile is launched vertically upward from the top of a 240-foot building. This translate to the model y = -16t^2 + 32t + 240 where y is the height in feet and t is the time in seconds after it was launched. When will he projectile hit the ground? would i divide both ...
*September 27, 2008 by jennifer*

**math**

A projectile is launched vertically upward from the top of a 240-foot building. This translate to the model y = -16t^2 + 32t + 240 where y is the height in feet and t is the time in seconds after it was launched. When will he projectile hit the ground? would i divide both ...
*September 27, 2008 by Anonymous*

**Physics**

An arrow was shot vertically upward at a velocity of 50.0 m/s. What was its velocity after 2.00 seconds?
*January 5, 2013 by Sam*

**Intermediate algebra**

If a ball is thrown vertically upward from the ground, with an initial velocity of 64 ft/s, it's height h after t seconds is given by h=-16t^2+64t how long does it take the ball to return to the ground?
*October 23, 2012 by Help now!!*

**physics**

At time t=0 a projectile passes through the point (0,0,192) with a velocity v=10i-2j+16k. Because of spin and gravity, the projectile experiences an acceleration given by a=2i-32k. a. Find the velocity v(t) and position vector R(t) at time t>0. b. At what time t does the ...
*February 23, 2011 by nicole*

**Physics**

Take into account the Earth's rotational speed (1 rev/day) and use 5 significant figures. (a) Determine the necessary speed, with respect to Earth, for a rocket to escape if fired from the Earth at the equator in a direction eastward. (The escape velocity from the surface of ...
*February 26, 2014 by Anonymous*

**physics**

A ball is thrown vertically upward, which is the positive direction. A little later it returns to its point of release. The ball is in the air for a total time of 7.84 s. What is its initial velocity? Neglect air resistance.
*September 18, 2012 by gary*

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