Thursday

May 26, 2016
Number of results: 14,275

**Math**

A model rocket is launched with an initial velocity of 164ft/sec. It's height h, in feet, after t seconds is given by the formula h=164t-16t^2. After how many seconds will the rocket first reach a height of 400ft?
*August 2, 2014 by Pam*

**physics**

A pot with a flower falls out of a window box in a tall apartment building. It passes the top of a particular window with a velocity of -1.7 m/s. It passes the bottom of this window 0.2800 s later? How tall is the window (watch sign)?
*September 27, 2014 by Jane*

**Physics**

A car travels 120 meters in one direction in 20 seconds. Then the car returns ¾ of the way back in 10 seconds. a) Calculate the average speed of the car for the first part of the trip. b) Find the average velocity of the car.
*September 27, 2014 by Iworlock*

**physics**

At what height above the ground must a body of mass 10kg be situated in order to have potential energy in value to the kinetic energy possessed by another body of mass 10kg moving with a velocity of 10m-s
*May 25, 2015 by sarah*

**Calculus**

The velocity of a ball that has been tossed vertically in the air is given by v(t) = 16 − 32t, where v is measured in feet per second, and t is measured in seconds. The ball is in the air from t = 0 until t = 2. Determine the value of v'(1). What are the units on the ...
*July 6, 2015 by George*

**Physics**

Lucky you have been commissioned to design a Bobsled Run for the new theme park Walrus of Fun going up in Anchorage, Alaska. You get a maximum of 1500 meters of track to work with. Except on the turns the coefficient of kinetic friction is .15. Here is what you need to have: ...
*March 17, 2008 by Ashley*

**Physics**

In 1998, NASA launched DS-1 (Deep Space 1). This spacecraft successfully flew by the asteroid 1992 KD. The propulsion system worked by ejecting argon ions at high speed. The propulsion system could increase the velocity by 7.2284x10^0 m/s per day. What was the average ...
*October 13, 2010 by shannon *

**Physics**

A figure skater spins on the ice, holding two weights a distance d from the axis about which he is rotating. At a certain time, he pulls these weights toward his body as shown, causing his rotational inertia to decrease by a factor of 2. How does this affect the maximum ...
*March 19, 2011 by John*

**Physics**

An airplane pilot sets a compass course due west and maintains an airspeed of 221km/h . After flying for a time of 0.490h, she finds herself over a town a distance 125km west and a distance 13km south of her starting point. FIND THE MAGNITUDE OF WIND VELOCITY. v = ___ km/h
*September 26, 2011 by Jenna*

**PHYSICS :(**

A helicopter is lifting off from the ground and is moving vertically upward. The graph shows its vertical velocity vy versus time. How high is the helicopter after 8 s have elapsed? ( WEBSITE WOULDNT LET ME POST THE PIC OF THE GRAPH) if you copy and paste the question into ...
*September 15, 2012 by Tayllor*

**physics**

A batted baseball, which leaves the bat at an angle 〖30〗^0 above the horizontal, is caught by an outfielder 120m from the plate. a.) What is the initiated velocity of the ball? b.) How high did it rise? c.) How long was it in the air? my friend asked that ...
*January 9, 2013 by kevin*

**physics**

A cargo plane is moving with a horizontal velocity of vx = +225 m/s at a height of y = 920 m above level ground as shown in the figure below when it releases a package. Ignoring air resistance, how much time will it take the package to reach the ground? (Express your answer to...
*March 26, 2013 by Dan*

**science**

which of the following examples does not demonstrate a change in velocity? an elevator coming to a stop as it reaches the top floor a cruise ship heading west at a constant speed a soccer ball passed across the field a train remains at a constant speed as it goes around a bend...
*April 4, 2014 by steve*

**physics**

A cargo plane is moving with a horizontal velocity of vx = +230 m/s at a height of y = 840 m above level ground as shown in the figure below when it releases a package. Ignoring air resistance, how much time will it take the package to reach the ground? (Express your answer to...
*January 12, 2015 by mathew*

**Physics **

A cargo plane is moving with a horizontal velocity of vx = +223 m/s at a height of y = 980 m above level ground as shown in the figure below when it releases a package. Ignoring air resistance, how much time will it take the package to reach the ground? (Express your answer to...
*October 13, 2015 by Mariah*

**Physics**

A student drops a lead ball 4" in diameter from the top of a large live oak tree. As the ball is falling, a bird flies under it, slowing the ball's velocity to 30 feet/sec. Two seconds later the ball strikes the ground. What is the coefficient of friction due to air resistance?
*January 23, 2016 by Johnny*

**Physics 101**

What is the net force of a 5.0 N force and an 7.0 N force acting on an object for each of the following conditions? (a) The forces act in opposite directions. ( )N (b) The forces act in the same direction.( )N ---------------------------------------------- A force of 2.4 N is ...
*January 24, 2013 by reda*

**Physics**

A novice pilot sets a plane's controls, thinking the plane will fly at 2.50 * 10*2 km/h to the north. If the wind blows at 75 km/h toward the southeast, what is the plane's resultant velocity? Use graphical techniques please show me how to solve this. the answer i need to come...
*January 31, 2009 by y912f*

**Physics**

A person walks 2.8597x10^1 m East, then turns around and walks 8.7898x10^1 m West. The total time to walk this distance was 4.4004x10^2 s. What is the velocity of the walker, expressed to 3 significant figures? Note: Your answer is assumed to be reduced to the highest power ...
*October 11, 2010 by annonomus*

**Physics**

A person walks 2.8597x10^1 m East, then turns around and walks 8.7898x10^1 m West. The total time to walk this distance was 4.4004x10^2 s. What is the velocity of the walker, expressed to 3 significant figures? Note: Your answer is assumed to be reduced to the highest power ...
*October 11, 2010 by christine*

**Physics**

A person walks 2.8597x10^1 m East, then turns around and walks 8.7898x10^1 m West. The total time to walk this distance was 4.4004x10^2 s. What is the velocity of the walker, expressed to 3 significant figures? Note: Your answer is assumed to be reduced to the highest power ...
*October 11, 2010 by christine*

**physics**

Your English teacher can swim with a constant speed of 0.67m/s. While facing south , he attempts to swim straight across the St. Lawrence River , which moves east at 1.4 m/s a) find his velocity as seen from the riverbank. B) if the river was 175m wide How long does it take ...
*June 14, 2012 by Melissa*

**Math**

In an experiment, a seabird was taken from its nest, flown a distance 5190 km away, and released. It found its way back to its nest a time 13.8 days after release. What was the bird's average velocity in m/s for the whole episode, from leaving the nest to returning? Would I ...
*June 30, 2011 by layla*

**Physics**

A person throws a ball upward into the air with an initial velocity of 15.0 m/s. Calculate the following: a.) how high it goes. b.) how long the ball is in the air before it comes back to his hand. c.) at what time(s) will the ball pass a point 8.00 m. If you got multiples ...
*September 26, 2011 by Jane*

**Physics**

A person throws a ball upward into the air with an initial velocity of 15.0 m/s. Calculate the following: a.) how high it goes. b.) how long the ball is in the air before it comes back to his hand. c.) at what time(s) will the ball pass a point 8.00 m. If you got multiples ...
*September 27, 2011 by Phil*

**physics**

a 75 kg person escapes from a burning building by jumping from a window 30 m above a catching net. Acceleration due to gravity is 9.81 m/s^2. Assuming air resistance is simply a constant 96 N force on the person during the fall, determine the person's velocity just before ...
*October 11, 2011 by Emily*

**Math**

A particle A of mass 2.11 kg collides with another particle B of mass 3.86 kg. Their initial velocities are u1 = 2.16i + 0.88j and u2 = 0.7i + 1.12j just before impact. After collision, they both merged and becomes a composite particle, which travel with a velocity of V. ...
*September 3, 2012 by Darren*

**physics**

A 83 kg person escapes from a burning building by jumping from a window 21 m above a catching net. The acceleration of gravity is 9.81 m/s 2 . Assuming that air resistance is simply a constant 92 N force on the person during the fall, determine the person’s velocity just ...
*December 18, 2012 by amir*

**Physics **

Student observed ten antinodes on a string of length 1.70 m under tension produced by a mass of 0.22 kg. The string linear density is 1.3 gram/meter. What is the difference between the transverse wave velocity calculated from the string material properties and the one ...
*October 25, 2013 by Amy*

**physics**

A block and tackle with a velocity of 5 is used to raise a mass of 25kg through a vertical distance of 40cm at a steady rate,if the effort is equal to 60N,determine the distance moved by effort, work done by the effort in lifting the load and the loss of energy involved in ...
*January 29, 2015 by happiness*

**physic**

Jules Verne in 1865 proposede sending men to the moon by firing a space capsule from a 220-m-long cannon with final velocity of 10.97 km/s. what would have beed the unrealistically large accelerationexperienced travels during launch? compare your answer with the free-fall ...
*September 7, 2009 by Laura*

**physics**

After 10.0 s, a spinning roulette wheel at a casino has slowed down to an angular velocity of +1.56 rad/s. During this time, the wheel has an angular acceleration of -5.45 rad/s2. Determine the angular displacement of the wheel.
*November 2, 2010 by Danica*

**physics**

After 10.0 s, a spinning roulette wheel at a casino has slowed down to an angular velocity of +1.74 rad/s. During this time, the wheel has an angular acceleration of -5.1 rad/s2. Determine the angular displacement of the wheel.
*November 18, 2010 by michelle*

**physics**

A stone with mass m = 2.3 kg is thrown vertically upward into the air with an initial kinetic energy of 190 J. The drag force acting on the stone throughout its flight is constant, independent of the velocity of the stone, and has a magnitude of 2.3 N. What is the maximum ...
*February 22, 2012 by Katie*

**Math**

A 15 ft ladder leans against a wall. The bottom of the ladder is 3 ft from the wall at time t=0 and slides away from the wall at a rate of 3ft/sec. Find the velocity of the top of the ladder at time t=3.
*October 14, 2007 by Anonymous*

**physics**

An elevator is initially moving upward at a speed of 12.84 m/s. The elevator experiences a constant downward acceleration of magnitude 3.80 m/s2 for 3.18 s. (a) Find the magnitude and direction of the elevator's final velocity. magnitude: direction:
*September 13, 2011 by Nour *

**physics**

A fox fleeing from a hunter encounters a 0.630 m tall fence and attempts to jump it. The fox jumps with an initial velocity of 7.20 m/s at an angle of 45.0°, beginning the jump 2.18 m from the fence. How far does the fox clear the fence
*October 16, 2012 by Anthony *

**Physics**

A charge of -5.02 μC is traveling at a speed of 8.86 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 54.6o. A force of magnitude7.85 × 10-3 N acts on the charge. What is the magnitude of the ...
*May 17, 2016 by Matthew*

**physics**

A charge of -5.02 μC is traveling at a speed of 8.86 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 54.6o. A force of magnitude7.85 × 10-3 N acts on the charge. What is the magnitude of the ...
*May 17, 2016 by Lily*

**Physics**

I just wanted to be sure if I got the answer right 1. Jenny (75 kg) goes on a ski trip. She goes down a slope that's inclined at 15*. Her drag coefficient is 0.300, the area of contact with the air is 0.750 m^2 and the air density is 1,31 kg/m^3. The coefficient of kinetic ...
*January 31, 2012 by Tom*

**geometry**

For problems 7 and 8, find the magnitude and direction angle of the given vector. 7. <3, 4> A magnitude: 5; direction angle: 53.13° B magnitude: √ 5; direction angle: 53.13° C magnitude: √5; direction angle: 3.40° D magnitude: √5; direction angle: 0.80...
*December 14, 2011 by Cam*

**Physics**

Im talking about the friction between a golf club and the air as the golf club is swinging towards the ball. how does the mass of the club, the velocity of the swing and the acceleration affect the friction acting on the club and how much will it slow down?
*April 26, 2009 by Lena*

**physics**

A 2.7-kg box is released on a horizontal surface with an initial speed of 2.9 m/s. It moves on the surface with a deceleration of 0.27 m/s^2. Calculate the kinetic friction force on the box. I couldn't find an example of this anywhere but...is it: {Friction Force} = m*a = (2.7...
*May 25, 2009 by Jamie*

**Physics**

A merry-go-round accelerates from est at .870 rad/sec^2. When the merry-go-round has made 4 complete revolutions, how much time has elapsed since the merry-go round started? What is the angular velocity of the merry-go round? Could someone help, please
*January 27, 2010 by help*

**Physics**

In the ideal apparatus shown in the diagram, m1 = 2.0 kg. What is m2 if both masses are at rest? How about if both masses are moving at constant velocity? Ideal aparatus is a pulley system with M1 on a 37 degree incline and m2 dangle on the other side of the incline
*April 7, 2010 by Anonymous*

**Physics**

In a cyclotron, an electromagnet exerts a force of 7.50x10-13N on a beam of protons. Each proton has a mass of 1.67x10-27kg. The electromagnet causes the protons to travel in a circular path of radius 1.20m. What is the velocity of the proton beam?
*May 3, 2010 by Elvia*

**Physics for Life science**

A boy climbs up an 8.00m high tree. To come back down, the boy slides down along a rope. The coefficient of friction between the rope and the boy is 0.40. What is the velocity with which the boy reaches ground?
*June 1, 2010 by TangenT*

**Physics**

A ball of mass m1= .250 kg and velocity v01 = + 5 m/s collides head-on with a ball of mass m2= .800 kg that is initially at rest (v02 = 0 m/s). No external forces act on the balls. If the collision is elastic, what are the velocities of the balls after the collision?
*September 16, 2010 by zevi*

**Physics**

A ball is thrown upwards on the moon with an initial speed of 35m/s. Calculate (a)the time taken to reach the maximum height. (b) the maximum height reached by the ball (c) Its velocity 3seconds after it has been thrown. (g=1.6ms^2)
*November 16, 2010 by Jess*

**Science**

My mother in law falls from a 200m cliff. Answer the following. a. What is her acceleration after 2 seconds? What is her acceleration after 3 sec? b. How long will it take her to hit the ground? c. What would be her velocity right before she hit the ground?
*December 2, 2010 by Robbi*

**physics**

The space shuttle has a mass of 2.0 × 106 kg. At lift-off the engines generate an upward force of 30 × 106 N. a. What is the weight of the shuttle? b. What is the acceleration of the shuttle when launched? c. The average acceleration of the shuttle during its 10 minute launch ...
*August 17, 2011 by Anonymous*

**physics**

A diver springs upward with an initial speed of 1.6 m/s from a 3.5-m board. (a) Find the velocity with which he strikes the water. [Hint: When the diver reaches the water, his displacement is y = -3.5 m (measured from the board), assuming that the downward direction is chosen ...
*September 29, 2011 by Anonymous*

**physics**

A person pushes a 11.3-kg shopping cart at a constant velocity for a distance of 19.4 m on a flat horizontal surface. She pushes in a direction 29.2 ° below the horizontal. A 44.6-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force that ...
*October 19, 2011 by mica*

**Physics**

A mortar shell is launched with a velocity of 100m/s at an angle of 30 degree above the horizontal from a point on a cliff 50m above a level plain below. How far from the base of the cliff does the mortar shell strike the ground?
*October 24, 2011 by Mark*

**Physics **

A rocket with initial mass of 7.50×103 kg is fired in the vertical direction. Its exhaust gases are ejected at the rate of 4.50×101 kg/s with a relative velocity of 2.200×103 m/s. What is the initial acceleration of the rocket? What is the acceleration after 20 s have elapsed?
*April 4, 2012 by Helen*

**Physics**

A mass of 1.0 kg is located at the end of a very light and rigid rod 44 cm in length. The rod is rotating about an axis at its opposite end with a rotational velocity of 3 rad/s. (a) What is the rotational inertia of the system? kg · m2 (b) What is the angular momentum of the ...
*April 6, 2012 by Jermaine*

**Physics**

A CD (radius 6.0 cm) is spinning freely with an angular velocity of 450 rpm when a bug drops onto the CD a distance 4.6 cm from the center. If the CD slows to 260 rpm, what is the ratio of the bug's mass to the mass of the CD? (Ignore the effect of the hole in the center of ...
*June 5, 2012 by Alex*

**physics**

A car starts from rest and moves along x-axis with constant acceleration (5m/secondsquare) fr 8 sec. If it then countinues with constant velocity. What distance will the car cover in 12 sec since it started frm rest. plz anybody explain me
*July 5, 2012 by Maihul*

**physics**

A 0.73 kg ball is thrown straight up with an initial velocity of 2.50 m/s. Taking the potential energy of gravity to be zero at the height from which the ball is thrown, determine its gravitational potential energy at the balls highest point. Ignore air resistance.
*October 5, 2012 by nate*

**Physics**

A train moving with constant velocity travels 190 north in 14s and an undetermined distance to the west. The speed of the train is 36m/s. Find the direction of the train's motion relative to north. How far west has the train traveled?
*February 7, 2013 by Chelsea*

**engineering**

a ship is 100km north west of cape town harbour and it sails directly north at a velocity of 30km/h in ei ght hours.calculate its resultant speed with reference to the cape town harbour in magnitude and direction
*February 20, 2013 by Anonymous*

**physics**

2 balls of clay , the first of mass 0.5kg,the other of mass 0.75kg approach each other ,each travels with a velocity of 0.5m\s,after the collision they stick together,what is the total energy after collision .Obtain the coefficient of restitution.
*June 3, 2013 by samuel*

**Physics **

How can you find the velocity of a bullet fired from a nerf gun the second it leaves the gun, if all you have is the angle it was shot at, and how far it traveled? (All in degrees) 0 degrees=2.54m 10=6.24m 30=6.54m 45=6.58m 60=1.6m 80=.94m
*September 26, 2013 by Tiana*

**Physic: Projectile Motion**

a soccer player shoots a soccer ball at the opposing goal from 15 m away. If the ball leaves his foot at an angle of 20(degree) with the ground, what must its initial velocity be if it enter the goal 2.0 m above the ground?
*November 26, 2013 by Zawng*

**Physic: Projectile Motion**

a soccer player shoots a soccer ball at the opposing goal from 15 m away. If the ball leaves his foot at an angle of 20(degree) with the ground, what must its initial velocity be if it enter the goal 2.0 m above the ground?
*November 26, 2013 by Zawng*

**Engineering science N4**

A ship is 100km north-west of cape town harbour and it sails directly north at a velocity of 30km/h in 8 hours.calculate its resultant speed with reference to the cape town harbour in magnitude and direction.
*January 30, 2014 by Mike*

**science**

A car with a mass of 2.000 kilograms is moving around a circular curve at a uniform velocity of 25 meters per second. The curve has a radius of 80 meters what is the centripetal force on the car A.625N B.703N c. 15,625N D.20,250N
*January 31, 2014 by Anonymous*

**physics**

A proton, initially traveling in the +x-direction with a speed of 6.00×105m/s , enters a uniform electric field directed vertically upward. After traveling in this field for 4.38×10−7s , the proton’s velocity is directed 45 ∘ above the +x-axis.
*February 6, 2014 by chris*

**physics**

A girl throws a water-filled balloon at an angle of 50.0∘^\circ above the horizontal with a speed of 12.0m/s{\rm m}/{\rm s} . The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of 8.00m/s{\rm m}/{\...
*May 17, 2014 by joe*

**physics**

A girl throws a water-filled balloon at an angle of 50.0∘^\circ above the horizontal with a speed of 12.0m/s{\rm m}/{\rm s} . The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of 8.00m/s{\rm m}/{\...
*May 17, 2014 by joe*

**physics**

A motor boat whose speed is 2.6 m/s in still water, needs to point upstream at an angle of 28.5 in order to travel straight across the river. Calculate the speed of the current and the resultant velocity of the boat across the river.
*June 24, 2014 by jane*

**Physics **

A 5.0kg box slides 8.0m down a ramp, inclined at 40degrees from the horizontal. If the box slides at constant velocity, the work done by gravity is? I used W=F*deltaX*costheta =(mg)*(deltaX)*(costheta) =(5.0)(9.8)*(8.0)* (cos50) Which I got 252 J. Is this correct?
*October 21, 2014 by Anonymous*

**Math**

If an object is propelled upward from ground level with initial velocity of 55 feet per second, it's height h in feet t seconds later is given by the equation H=-16t^2+55t. after how many seconds does the object hit ground?
*October 28, 2014 by Liz*

**physics**

A projectile is fired at 12.5 m/s at an angle of 53.1 with the horizontal from a point 75m above the ground. A) How long does it take to reach the ground? B)What max height does it reach? C) What horizontal distance does it travel before striking the ground? D) With what ...
*November 2, 2014 by Brooke*

**SCIENCE**

Joseph jogs from one end "A" to another end "B"of a straight road in 300 metre in 2 minutes 50 seconds and then turns around and jogs 100 metre back to point"c"in another 1 minute.What is the Joseph'S average speed and velocity from "A"to"B" "A"to"c"
*June 9, 2015 by RAI*

**Physics **

A projectile is fired at 12.5 m/s at an angle of 53.1 with the horizontal from a point 75m above the ground. A) How long does it take to reach the ground? B)What max height does it reach? C) What horizontal distance does it travel before striking the ground? D) With what ...
*September 27, 2015 by Kitty*

**Math**

a satellite traveling in a circular orbit 2000 kilometers above the earth completes one orbit every 3 hours. assume the earth is a sphere and its radius is 6400 kilometers. find the angular velocity of the satellite
*January 18, 2016 by Jade*

**Math**

a satellite traveling in a circular orbit 2000 kilometers above the earth completes one orbit every 3 hours. assume the earth is a sphere and its radius is 6400 kilometers. find the angular velocity of the satellite
*January 19, 2016 by Jade*

**PHYSICS**

At what height above the ground must a body of mass 10kg be situated inorder to have potential energy equal in value to the kinetic energy possessed by another body of mass 10kg moving with a velocity of 10m/s?
*January 30, 2016 by Anonymous*

**Physics **

A 56kg student runs at 5m/s, grabs a hanging rope and swings out over a lake. He releases the rope when his velocity is zero. The length of the rope is 10m, what is the angle when he releases the rope? (The person swings from the centre to the right).
*May 16, 2016 by Veronica*

**physics**

if a ship moving to South and wind is flowing due West(at given velocities),we can find the angle by which the ship is deviated.Does here the momenta of wind and ship matter?If it had been water at same velocity instead of wind, what would have happened?
*July 29, 2011 by ...........................*

**Physics**

A 2.6 kg block slides down a 25° inclined plane with constant acceleration. The block starts from rest at the top. At the bottom, its velocity is 0.80 m/s. The incline is 1.6 m long. (a) What is the acceleration of the block? m/s2 wb=m*g=2.6*9.8=25.48 fp=25.48sin25=10.77n Fn=...
*October 16, 2014 by Miah*

**Nm juniour clg,rkl**

A 20gm bullet collision is fired horizontaly into a 5kg block of wood.suspended by a long spring.The bullet gets embedded in the block and the block at the hole swing 15cm above in intial level.calculate the velocity of bullet?
*November 3, 2015 by Nikhil*

**Physics question bout falling**

Objects that are falling toward Earth in free fall move a)faster and faster. b)slower and slower. c)at a constant velocity. d)slower then faster.
*September 29, 2010 by Aisumi*

**multiple choices **

Which of the following is accelerating? An object moving with a constant velocity. An object moving along a curve. None An object moving on a straught line with a constant speed.
*November 6, 2010 by meera*

**Physics**

A ball rolls over the edge of a table with a horizontal velocity v m/s. the height of the table is 2.1m and the horizontal range of the ball from the base of the table is 16m. What is the initial speed of the ball?
*November 16, 2015 by DaiAna*

**physics**

A block with a mass of 126 kg is pulled with a horizontal fource of F_{applied} across a rough floor. The coefficent of friction between the floor and the block is 0.7. If the block is moving at a constant velocity, what is the magnitude of F_{applied}? F_{applied} =
*February 21, 2014 by sean*

**PHYSICS**

A block with a mass of 126 kg is pulled with a horizontal force of F applied across a rough floor. The coefficent of friction between the floor and the block is 0.7. If the block is moving at a constant velocity, what is the magnitude of F applied? F applied =
*February 23, 2014 by cris*

**physics**

compute the kinetic energy of an 1800 lb automobile traveling at 30 mi/hr. how many times as great is the kinetic energy if the velocity is doubled? compute the kinetic energy, in erg and in joules, of a 2 gram bullet travelling at 500 m/sec.
*April 17, 2014 by Anonymous*

**Physics**

The instruments attached to a balloon have a mass of 5kg. The balloon is released and exerts an upward force of 100 N. After the balloon has accelerated for 10s, the instruments are released. What is the velocity of the instruments at the moment of release?
*November 2, 2015 by Bill*

**physics**

A bullet has a mass of 5g leave a gun at a velocity of 100m/s. What is the kinetic energy of the bullet as it leave the gun? If the gun is fired vertically upwards, how high will the bullet go? (Ignore air resistance and assume g=10m/s2).
*February 17, 2016 by Anonymous*

**pHySiCs**

A 10 kg ball traveling at 5 m/s [S20E] has an elastic collision with a 15 kg ball traveling at 3 m/s [N50W]. If the first ball leaves the collision at 2 m/s [S40W] what is the second ball's velocity?
*November 2, 2008 by Bertrand*

**Physics**

Kyle is flying a helicopter and it is rising at 6.0 m/s when he releases a bag. After 2.0 s (a) what is the bag's velocity? -13.6 m/s (b) how far has the bag fallen? (c) how far below the helicopter is the bag?
*September 13, 2010 by Billy*

**chemistry**

If a skateboarder is going 40 meters per second after 3 seconds, what is the initial velocity of the skateboarder with an acceleration of 2.1 meters per second squared?
*February 8, 2011 by Anonymous*

**physics**

a wheel with an angular velocity of 300. rev/min increases to 500. rev/min in 10.0 sec. what is the angular acceleration the wheel is traveling?
*January 20, 2014 by sosa*

**physics**

a steel ball dropped from a tower strikes the ground in 3.0 seconds. Find the velocity with which the ball strikes the ground and the height of the tower in meters.
*June 20, 2014 by roger*

**Physics**

A 1450 kg car goes over a vertical hill with a radius of 64.7 m. What is the maximum velocity that will keep the car on the road as it goes over the hill?
*November 15, 2015 by Smit*

**physics**

A 10 kg mass moving at 6 m/s strikes a stationary 2 kg mass in an elastic collision. Determine the velocity of each after the collision. 10(6)+2(0)=(10)Vf1+(2)Vf2 60=(10)Vf1+(2)Vf2
*January 28, 2016 by alyssa*

**Chemistry**

What is the de Broglie wavelength of an oxygen molecule, O2 traveling at 521 m/s? Is the wavelength much smaller or much larger than the diameter of an atom. (on the order of 100 pm) De Broglie wavelength = h/mv h = Planck's constant in J*s. m is mass in kg. v is velocity in m...
*November 3, 2007 by Lauren*

**Physics**

A pitcher throws a curveball that reaches the catcher in 0.51 s. The ball curves because it is spinning at an average angular velocity of 345 rev/min (assumed constant) on its way to the catcher's mitt. What is the angular displacement of the baseball (in radians) as it ...
*March 24, 2008 by John*