Wednesday

January 18, 2017
Number of results: 15,118

**Physics**

A hollow sphere starts from rest and rolls down a hill without sliding. At the bottom of the hill, it has a linear velocity of 5 m/s. What was the height of the hill the sphere rolled down (in meters)?

*July 27, 2016 by Rebecca*

**8th grade**

A JetBlue flight from Jacksonville, FL to San Diego is flying at 500 km per hour west. It encounters a head wind that is moving at 300 km per hour in an easterly direction towards the east. What is the net velocity of the plane, include directions?

*September 23, 2009 by enrique*

**physics**

three parachutist have reached terminal velocity at the same distance above the ground below. One at 50kg anoher at 40 kg an 75kg from fastest to slowest what is there total terminal velocities.Then from longest to shortest time rank their order in reaching the ground.

*September 16, 2010 by ayssa*

**Science Physics**

A pitched ball is hit by a batter at a 50° angle and just clears the outfield fence, 97 m away. Assume that the fence is at the same height as the pitch and find the velocity of the ball when it left the bat. Neglect air resistance. whats the answer m/s at 50 degrees

*December 29, 2010 by Gogol*

**Physics Honors**

A bullet is fired from a rifle, emerging at 340 m/s. It strikes a sandbag some distance away, having lost 10% of its velocity due to air resistance. if it penetrates the sandbag to a depth of 12 meters, how long did it take for the bullet to come to rest in the bag?

*October 23, 2011 by Allison*

**Physics Honors**

A bullet is fired from a rifle, emerging at 340 m/s. It strikes a sandbag some distance away, having lost 10% of its velocity due to air resistance. if it penetrates the sandbag to a depth of 12 meters, how long did it take for the bullet to come to rest in the bag?

*October 23, 2011 by Allison*

**Physics**

A particle is projected vertically upwards from ground level with an initial velocity of 34.94m/s. Neglecting air resistance, calculate the total time taken, in seconds, for the particle to hit the ground again. Take the magnitude of the acceleration due to gravity to by 9.81m...

*March 6, 2012 by Annoymous*

**College Physics**

A proton moves with a velocity of vector v = (6ihat - 1jhat + khat) m/s in a region in which the magnetic field is vector B = (ihat + 2jhat - 3khat) T. What is the magnitude of the magnetic force this charge experiences? answer in Newtons. I tried F=qvb but the vectors are ...

*March 10, 2012 by Anand*

**Physics**

A high diver of mass 68.2 kg jumps off a board 10.4 m above the water. The acceleration of gravity is 9.8 m/s2 . If his downward motion is stopped 3.58 s after he enters the water, what average upward force did the water exert on him? I already calculated that his velocity ...

*December 5, 2012 by Khan*

**Integral Calculus**

A jeepney's velocity over time in ft/sec as it moves along the x-axis is governed by the function v(t)=3t^2-10t+15. If the jeep's position at t= 1 second is 8ft, what is the total displacement made by the jeepney from t=0 to t=5sec? please I need help, i just need the idea on ...

*January 12, 2014 by Lisa*

**Physics**

A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 21.0 m/s. Assuming a uniform rate of increase in angular velocity and a radius of 0.80 m, calculate the angle of this force with respect to the...

*February 2, 2014 by Liam*

**physics**

A helicopter is flying with a constant horizontal velocity of 144.2 kmph and is directly above the point A when a loose part begins to fall. The part lands 6.5seconds later at point B on an inclined surface. Determine (a) The distance 'd' between points A and B. (b) the ...

*April 16, 2015 by Anonymous*

**Physics **

An airplane with a velocity of 50m/s comes in to land at the start of the runway and brakes at -5m/s. Will it be able to stop in time if the runway is 275m long? I'm not sure which formula to use since the ones I have used give me very small answers in comparison to the 275m

*November 4, 2015 by Masha*

**calc**

A pitcher throws a baseball straight into the air with a velocity of 72 feet/sec. If acceleration due to gravity is -32 ft/sec2, how many seconds after it leaves the pitcher's hand will it take the ball to reach its highest point? Assume the position at time t = 0 is 0 feet.

*November 25, 2015 by ANONYMOUS*

**Algebra 2**

Please help! I'm having the worst time figuring this out. 3. One of the fireworks is launched from the top of the building that is 70ft tall with an initial upward velocity of 150 ft/sec. a. What is the equation for this situation? b. When will the firework land if it does not...

*January 22, 2016 by S.Burris*

**Physics**

An elevator (cabin mass 600 kg) is designed for a maximum load of 2700 kg, and to reach a velocity of 3.4 m/s in 5 s. For this scenario, what is the tension the elevator rope has to withstand? I know I have to multiply the mass by the acceleration. I'm having a hard time ...

*February 16, 2016 by Emily*

**Physics **

A Sunway train starts from rest at a station and accelerates at a rate of 2.0 ms^-2 for 10 s. It runs for constant speed for 50 s and slows down at a rate of 3.5 ms^-2 until it stops at the next station. Find the total distance covered Draw the velocity vs time graph for the ...

*September 28, 2016 by Molly*

**physics**

an astronaut on the moon fires a projectile from a launcher on a level surface so as to get the maximum range. If the launcher gives the projectile a muzzle velocity of 25 m/s what is the range of the projectile?

*January 1, 2008 by melissa*

**physical science**

the wavelength of an electromagnetic wave is ____________. a. directly proportional to its frequency b.inversely proportional to its velocity c. inversely proportional to its frequency d. none of the above

*February 27, 2009 by layla*

**science**

a shell is fired from the cannon. the shell of mass 30kg is shot with an initial velocity of 30m/s. what is the momentum of the cannon just after the shell is shot ?

*April 14, 2010 by chiara*

**physics**

a 10.0-g object moving to the right at 20.0 cm/s makes a elastic head-on collision with a 15-g object moving in the opposite direction at 30.0 cm/s find the velocity of each object after the collision.

*January 10, 2011 by Lily*

**physics **

A 60 g golf ball leaves the face of a golf club with a velocity of 75 m/s. If the club exerted an average force of 3.0 x 10^4 N, what was the time of impact between the club and the ball?

*February 3, 2011 by Sumita*

**Physics**

A baseball pitcher can throw a baseball at a velocity of 44.5 m/s. If the mass of the ball is 0.12 kg and the pitcher has it in his hand over a distance of 1.79 m, what is the average force exerted by the pitcher on the ball?

*September 26, 2011 by Anon*

**physics**

When the string is pulled a distance of 40 cm in 2.50 s, the wheel turns though 5 revolutions. What is the average speed of the string, and what is the average angular velocity of the wheel? What is the radius of the wheel?

*March 6, 2012 by Amy*

**physics**

A rifle with a muzzle velocity of Vo shoots a bullet at a target R ft away. How high above the target must the rifle be aimed so that the bullet will hit the target?

*October 8, 2012 by ringo*

**Physics**

A 10.0 g object moving to the right at 19.0 cm/s makes an elastic head-on collision with a 15.0 g object moving in the opposite direction at 30.0 cm/s. Find the velocity of each object after the collision.

*November 7, 2012 by Corey*

**physics**

a soccer player kicks a ball into the air at an angle of 36.0 above the horizontal. the initial velocity of the ball is +30.0m/s. how long is the soccer ball in the air?

*December 2, 2012 by amy*

**physics**

A small fish is dropped by a pelican that is rising steadily at 0.60 m/s. After 2.8 s, what is the velocity of the fish? The acceleration of gravity is 9.81 m/s2. How far below the pelican is the fish after the 2.8 s?

*October 7, 2013 by Anonymous*

**physics**

a .025kg bullet is fired upward through a .36kg block. the block goes .17meters and the bullet goes up 24 m in the air. what is the initial velocity of the bullet?

*October 9, 2013 by Sara*

**math alegebra**

A satellite's escape velocity is 6.mi./sec, the radius of the earth is 3960 mi, and the earth's gravitational constant (g) is 32.2 ft./sec^2. How far is the satellite from the surface of the earth?

*December 8, 2013 by Ernie*

**classical mechanics**

th a hole (14 points possible) A cylindrical bucket has a small hole at the bottom. The water exiting the hole has velocity . What is the depth, , of the water in the bucket?

*December 10, 2013 by socorro*

**chemistry**

The tomato is dropped. What is the velocity, v , of the tomato when it hits the ground? Assume 91.9% of the work done in Part A is transferred to kinetic energy, E , by the time the tomato hits the ground.

*November 15, 2014 by maxime Jones*

**Chemistry**

The tomato is dropped. What is the velocity, v, of the tomato when it hits the ground? Assume 94.7% of the work done in Part A is transferred to kinetic energy, E, by the time the tomato hits the ground.

*December 7, 2014 by Caitlin*

**Physics**

A car is at mile marker 132 on the highway heading North. Of the car is traveling with a velocity of 24 mi/hr, what mile marker will the car be at after 150 minutes

*September 12, 2015 by Michael*

**Science**

An object is moving with uniform acceleration and it's velocity after 5 second is 25m/s after 8 second it is 34m/s find distance travelled by object in 12 second

*June 16, 2016 by Harsh*

**physics**

A rotating wheel requires 7.00 s to rotate 28.0 revolutions. Its angular velocity at the end of the 7.00-s interval is 97.0 rad/s. What is the constant angular acceleration (in rad/s) of the wheel? rad/s2

*October 17, 2016 by amy*

**physics**

A train moving at a constant speed of 68.0 km/h moves east for 33.0 min, then in a direction 40.0° east of due north for 30.0 min, and then west for 59.0 min. What is the average velocity of the train during this run? Magnitude km/h

*December 16, 2008 by help*

**physics**

A sled is pulled at a constant velocity across a horizontal snow surface. If a force of 100 N is applied to the sled at an angle of 40 degrees to the ground, what is the force of friction between the sled and the snow?

*October 26, 2009 by Brittany*

**physics**

An astronaut whose mass is 80. kg carries an empty oxygen tank with a mass of 10. kg. The astronaut throws the tank away with a speed of 2.0 m/s. With what velocity does the astronaut start to move off into space?

*December 7, 2009 by Cory *

**physics**

A 20.0kg mass is placed a the top of a 3.5m long, 15degree ramp. When released from rest, the mass accelerates down the ramp. The frictional force acting on the mass is 11.0 N. What is the velocity of the mass at the bottom of the ramp.

*December 9, 2009 by Alexandra*

**physics**

A bullet leaves a rifle with a muzzle velocity of 521 m/s. While accelerating through the barrel of the rifle, the bullet moves a distance of 0.840 m. Determine the acceleration of the bullet (uniform acceleration)

*November 1, 2010 by Cassie*

**chem, help please**

A 0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. The velocity of the rock is 4.50 m/s. What is the centripetal force acting on the rock? how do i find centripetal force??

*November 19, 2010 by Jon*

**calculus - integration**

A baseball is thrown upward from a height of 2m with an initial velocity of 10m/s. Determine its maximum height. S(0) = 2m S'(0) = 10m/s S'(t) = -32t + 10 S(t) = -16t^2 + 10t + 2 I know that if you equal s(t) = 0 you get time, but how do I get maximum height? Thanx in advanced!

*February 1, 2011 by Gabriel*

**Physics**

A ball dropped from rest on to horizontal ground 20m between rebounds with 3/4 of the velocity with which it hits the ground find time that elapses between the first and second in part of the ball with the ground

*October 2, 2011 by Anonymous*

**physics**

A dog with a mass of 15kg jumps forward at 0.50m/s to catch a frisbee coming in the opposite direction at 5m/s. the dog catches the frisbee in its mouth and in doing so its velocity drops to 0.45m/s. What was the mass of the frisbee?

*October 12, 2011 by Robert*

**physics**

If you were standing in an enclosed car moving at constant velocity, would you have learned in some special way to compensate for the car’s motion? What if the car were moving with constant acceleration? Explain.

*December 8, 2011 by erwin*

**physics**

A boy is swinging a toy on a piece of string in a vertical circle. The toy has a mass of 150g & the radius of the circle is 0.8m. A. he swings the toy with a linear velocity of 2m/s will the toy move in a circle? Explain your answer.

*December 22, 2011 by biruk*

**physics**

A hockey puck, mass 0.130 kg, moving at 40.0 m/s, strikes an octopus thrown on the ice by a fan. The octopus has a mass of 0.270 kg. The puck and octopus slide off together. Find their velocity.

*January 9, 2012 by Anonymous*

**physics**

A stone is catapulted at time t = 0, with an initial velocity of magnitude 20.2 m/s and at an angle of 39.1° above the horizontal. What are the magnitudes of the (a) horizontal and (b) vertical components of its displacement from the catapult site at t = 1.10 s? Repeat for ...

*February 8, 2012 by Rachel M*

**Physics**

A flywheel accelerates from rest to an angular velocity of 10.44rad/s at an angular acceleration of 51.57rad/s^2. The diameter of the flywheel is 1.16m. At this instant, calculate the resultant linear acceleration, in m/s^2, of a point on the circumference of the flywheel.

*April 18, 2012 by Anonymous*

**AP Physics C**

A stone is catapulted at time t = 0, with an initial velocity of magnitude 21.5 m/s and at an angle of 35.3° above the horizontal. What are the magnitudes of the (a) horizontal and (b) vertical components of its displacement from the catapult site at t = 1.06 s? Repeat for ...

*September 17, 2012 by Shane*

**Physics **

A toy plane of mass 0.624 kg is flown in a circle when attached to a string. The plane moves around the circle with a rotational speed of 8.09 rpm. The length of the string is 2.60 m. What is the tangential velocity, v, of the plane? .

*January 3, 2013 by Alex*

**Physics **

A toy plane of mass 0.624 kg is flown in a circle when attached to a string. The plane moves around the circle with a rotational speed of 8.09 rpm. The length of the string is 2.60 m. What is the tangential velocity, v, of the plane? .

*January 3, 2013 by Alex*

**physics**

In her physics lab, Jessica rolls a 11-g marble down a ramp and off the table with a horizontal velocity of 1.38 m/s. The marble falls in a cup placed 0.45 m from the table's edge. Find the table's height.

*February 6, 2013 by ronnie*

**Physics**

A child throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. The ball leaves her hand 1.00 m above the ground. What is the magnitude of the ball's velocity just before it hits the ground?

*February 24, 2013 by Joe*

**Physics**

150kg cart is traveling right 3m/s. a 20kg block of coal comes from the cart at 38degrees below the horizontal. The new velocity of the cart with the block is 3.95m/s. What is the initial speed of the coal.

*April 14, 2013 by Frustrated*

**Physics**

A golf club is swung with an average angular acceleration of 1.7 rad/s^2. If thee time from start of the swing until the club hits the ball is .7 s, what is the angular velocity of the club when it strikes the ball?

*November 7, 2013 by Caitlin*

**Physics **

Problem 1- A 0.5 kg ball is moving to the right at 5 m/s when it is suddenly collide by a wall that exerts on it a horizontal force of 2.5 N for a period of 0.8 s. a) What is the impulse does the force of the wall exert on the ball? b) What is the velocity of the ball after ...

*January 12, 2014 by Mariam*

**phisecs**

.: A 5.0 kg block is moving with constant velocity down a rough incline plane. The coefficients of static and kinetic friction between the block and the incline are 0.25 and 0.20, respectively. What is the inclination angle of the incline plane?

*March 24, 2014 by w*

**physics**

a car is moving foward at 15.7m/s. a person in the bus throws a ball horizontally toward the front of the car at 17.5 m/s from your perspective as an observer outside the car the tennis ball appears to moving at what velocity?

*July 28, 2014 by alysssa*

**physics**

Moving fast proton of 4x106 m / s through a 1.7 T magnetic field experiences a force 8x10-13N magnetic. What is the angle between the velocity vector associated with the proton and the magnetic field?

*November 23, 2014 by daniel*

**physics**

A child on a barber shop spins on a stool. If the child turns counterclockwise through 8.0 radians at a certain time and with an angular velocity of 2.56 rad/s. What is the time interval in minutes when the child turns?

*December 1, 2014 by Ana*

**physics**

Given a velocity time graph how do you determine when the object is moving at the lowest speed is it when V=O or when the gradient is the less steepest? Do the terms "moving at lowest speed" and "moving slowest" mean the same

*March 30, 2016 by Anonymous*

**Quadratic Functions Applications**

1. The distance, d(t), fallen by a free-falling body is represented by d(t)+vt-0.5gt^2, where v is initial velocity and g is acceleration due to gravity. The acceleration due to gravity is 9.8 m/s^2. If a rock is thrown downward with an initial velocity of 4 m/s from the edge ...

*November 15, 2015 by cierra*

**Physics**

A flowerpot falls from a window sill 37.6 m above the sidewalk.? A) What is the velocity of the flowerpot when it strikes the ground? The acceleration of gravity is 9.81 m/s2 ? B) How much time does a passerby on the side-walk below have to move out of the way before the ...

*September 7, 2011 by Stephen*

**physics**

A riﬂe ﬁres a(n) 3 g bullet with a muzzle velocity of 370 m/s into a block of wood. The bullet comes to rest after it has made a(n) 17 cm deep hole in the wood. v a What is the magnitude of the average frictional force slowed the bullet? Answer in units of N

*December 21, 2012 by Anonymous*

**physics**

A rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 16 m/s at an angle of 55° above the horizontal. The kit is caught right at the peak of the its trajectory. What is the vertical height between the ...

*October 14, 2013 by Bonnie*

**science**

A vehicle starts from rest and accelerates with a constant acceleration, covering 200m in 5s. it then continues at a constant velocity for 300m before decelerating with a constant 2m/s^2 deceleration to a stop. what is the maximum speed attained, total time traveled, total ...

*September 9, 2014 by annie*

**trigonometry**

please help me to solve this problem: calculate the angular velocity of a point for the given number of revolutions and time. express the answer on in radians per minute. 1.θ=1/2;t=2min. 2.θ=1/4;t=5min. 3.θ=2/3;t=10min. 4.θ=3/5;t=12min. 5.θ=5/6;t=15min...

*November 30, 2014 by deyanz*

**maths**

a car weighing 1600kg moving with a velocity of 30 meter per second retarded uniformly coming to rest in 20 seconds calculate 1, initial momentum 2, final momentum 3, rate of change of momentum 4,acceleration of the car 5, magnitude of the force apply

*January 28, 2016 by mike *

**physics**

A hose ejects water at a speed of 2m/s through a hole of area 0.01m2.if the water strikes a wall normally,calculate the force on the wall in Newtons,assuming the velocity of water nomal to wall is zero after collision.

*February 16, 2012 by mariam*

**physics**

A block having mass 90 kg.just contact the top of the free end of spring. (1) find the maximum deflection of spring if the block is released instantaneously with zero initial velocity. (2) if the block is very gradually lowered on the spring.

*October 23, 2013 by Sarsi*

**physical science**

A 200.0 kg astronaut and equipment move with a velocity of 2.00 m/s toward an orbiting spacecraft. How long will the astronaut need to fire a 100.0 N rocket backpack to stop the motion relative to the spacecraft? 100*timefiring= mass*changevelocity

*August 30, 2006 by Amie*

**math,correction**

can someone correct this for me thanks A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s. Use this information for exercises 35 to 38. Science and medicine. When will the ball reach a height of 80 m? h = -5t^2+20t+100 My answer: ...

*April 5, 2007 by jasmin20*

**Physics**

A ball is thrown horizontally from a height of 16.01 m and hits the ground with a speed that is 5.0 times its initial speed. What was the initial speed? Ok so I got a vertical final velocity of 17.714 m/s. Now I need to find the horizontal speed, correct? Which equation can I ...

*November 4, 2007 by Lindsay*

**physics**

for a free throw in basketball,find an equation for the final angle to go into the hoop in terms of y and x to the hoop and the initial angle. I can't seem to get an equation with only those variables. I always get stuck with others like time and velocity. how do i do this?

*February 3, 2008 by Mischa*

**Physics**

A man stands on the roof of a 10.0 -tall building and throws a rock with a velocity of magnitude 30.0 at an angle of 38.0 above the horizontal. You can ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock strikes ...

*February 6, 2008 by Ava*

**science (motion)**

You are walking toward the back of a bus that is moving forward with a constant velocity. Describe your motion relative to the bus and relative to a point on the ground. A car travels at an average speed of 30 m/s for .8 h. Find the total distance traveled in km.

*April 29, 2009 by lol*

**Physics**

In an elastic collision: mass a is 1kg, and is moving at 100ms^1 in the +ve x direction when it hits mass b, 10kgs at rest. Given: mass a moves off at 80 ms^1 in the -ve x direction. What's the final velocity of mass b. Using cons of momentum, i say 2 ms^1 in the +ve x ...

*June 16, 2009 by charlie*

**PHysics**

A ballplayer standing at home plate hits a baseball that is caught by another player at the same height above the ground from which it is hit. The ball is hit with an initial velocity of 20.6 m/s at an angle of 58.9 degrees above the horizontal. How high will the ball rise?

*November 5, 2009 by Anonymous*

**physics**

skydiver not in freefall because wind resistance prevents her from accelerating indefinitely. If skydiver weighs 750N whats the force due to wind resistance after reaches terminal velocity but before her parachute opens traveling at 200 km.hr

*March 7, 2010 by jco*

**college algebra**

When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -5t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in feet (as if you were on...

*March 29, 2010 by renee*

**math**

When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in feet (as if you were ...

*May 5, 2010 by casey*

**math**

When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in feet (as if you were ...

*May 5, 2010 by casey*

**Physics**

A football player punts the football so that it will have a hang time of 4.5s and land 46m away. If the ball leaves the player's foot 1.5m above the ground, what must be (a) the magnitude and (b) angle (relative to the horizontal) of the ball's initial velocity?

*June 28, 2010 by Pat*

**physics**

A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x value does the tennis ...

*November 20, 2010 by sandhu*

**physics**

A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x value does the tennis ...

*November 21, 2010 by sandhu*

**physics**

A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x value does the tennis ...

*November 21, 2010 by sandhu*

**Calculus**

a rifle aimed horizontally and 5 feet above level ground fires a bullet with a muzzle velocity of 3000 ft/sec. How far does the bullet travel from the end of the muzzle before it strikes the ground? (Ignore air resistance)

*February 16, 2011 by Jr*

**Calculus**

a rifle aimed horizontally and 5 feet above level ground fires a bullet with a muzzle velocity of 3000 ft/sec. How far does the bullet travel from the end of the muzzle before it strikes the ground? (Ignore air resistance)

*February 16, 2011 by Jr*

**PHYSICS**

An object undergoes simple harmonic motion. During that motion the object needs 1.1 seconds to reach one point of zero velocity from the previous such point. If the distance between those points is 0.3 m, calculate the period.

*April 7, 2011 by Unknown*

**trig**

An aifplane is flying on a compass heading (bearing) of 170* at 460 mph. A wind is blowing with the bearing 200* at 80mph. a) Find the component form of the velocity of the airplane. b) Find the actual ground speed and direction of the airplane.

*May 25, 2011 by ale*

**physics**

an 80 kg boy holding on to a helium balloon jumps off of a 20m tall building and floats to the ground. If the boant force of the balloon is 750 N upward, what is the boy's acceleration and final velocity just before he touches the ground?

*October 4, 2011 by zahid*

**Physics**

Cheryl runs a race on a 400.0 m circular track. She starts running east of the starting line and then circles the track and falls, stopping 1.00 m west of the starting line. Her time is 80.0 s. What was her average velocity? I believe that it would be -1.25 x 10^-2 m/s, is ...

*October 12, 2011 by Mishaka*

**physics**

a cannon fire a bullet into a castle. leave the gun with velocity of 110 with an angle of 20. the bullet reaches highest point at P when it is 1 m above the castle. What is the height of the top of the castle? and waht is the horizontal distamce between the accnon and the castle

*February 5, 2012 by Elise*

**physics**

The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.41 rad/s2. It accelerates for 25.5 s, then maintains a constant angular velocity. Calculate the total angle through which the wheel has turned 65.5 s after it begins rotating.

*February 10, 2012 by qwertzuiop*

**physics**

A man stands on the roof of a 10.0 -tall building and throws a rock with a velocity of magnitude 30.0 at an angle of 34.0 above the horizontal. You can ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock strikes ...

*February 21, 2012 by Rei*

**physics**

A man stands on the roof of a 10.0 -tall building and throws a rock with a velocity of magnitude 30.0 at an angle of 34.0 above the horizontal. You can ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock strikes ...

*February 21, 2012 by Rei*

**Physics (Mechanics)**

An electron of mass 9.1E-31 kg is released from rest at a distance of 7.1 E-10 m from a fixed electron. The force on the movable electron is given by the function F = 2.3E-28/r^2, where r is the distance between the electrons. Find the maximum velocity (in meters/second) of ...

*April 12, 2012 by andrew*

**Physics**

A baseball teams ace pitcher throws fast balls at a velocity of 160kmh, the balls are released at a height of 1.6m from the ground, given that the distance between pitcher and plate is 18.4m how far has the ball dropped when it passes over the plate?

*July 29, 2012 by Alex*