Sunday

April 20, 2014

April 20, 2014

Number of results: 37,950

**Physics**

A motorboat is traveling 5m/s East, and encounters a current traveling 2.5m/s, North. If the witdth of the river is 80m wide, how much time does it take the boat to reach the other shore. I understand how to calculate the resulatant velocity, but I dont understand why you use ...
*Wednesday, October 20, 2010 at 2:38pm by Jennifer *

**Math**

Although you could calculate the velocity for the return, there is no information to calculate the velocity for the trip from the nest. How fast did the plane fly?
*Thursday, June 30, 2011 at 5:14pm by PsyDAG*

**Physics**

A particle's initial velocity is given by vox = -1.0 m/s and voy = 3.0 m/s. Its acceleration is ax = 0.50 m/s^2 and ay = -0.90 m/s^2 (a) Calculate its velocity 2.0 s later. (b) Calculate its displacement at that time.
*Sunday, October 4, 2009 at 1:57pm by Sandhu*

**physics**

Use the potential energy e*V to calculate the velocity through the deflection plates. Call it v. The drift time through the plates is t = 0.061/v meters Calculate the lateral acceleration of the electron as it passes througn the plates, a = e*250/(0.012*m) Calculate the ...
*Tuesday, March 23, 2010 at 10:23am by drwls*

**physics**

initial velocity = 0 m/s final velocity = 4.92 m/s constant acceleration so, (a) average velocity = (initial velocity + final velocity)/2 (b) distance = average velocity x time substitute and calculate
*Wednesday, August 29, 2012 at 9:16pm by charrice*

**physics**

While sitting on a frozen pond, a 35kg child throws a 0.5kg ball horizontally at a velocity of +6m/s. Calculate the resulting velocity of the child across the ice.Suppose the child throws the ball upward instead, at a 25o angle above horizontal. a) Calculate the resulting ...
*Tuesday, October 2, 2012 at 4:59pm by taryn*

**physics**

First you have to calculate the time it takes for the block to hit the ground. y(t)=vit+(1/2)gt^2 y(t)=1+(1/2)(-9.80)t^2 Solve for t: t=0.45s With distance and time you can calculate velocity: d/t= 2.00/0.45= 4.44m/s Use this velocity in calculating the initial velocity of the...
*Tuesday, March 24, 2009 at 12:36pm by Courtney*

**Physics**

A ball, initially at y = 0, is thrown straight down and takes 1.50 s to move 15.5 m in the - y direction. Calculate the initial velocity of the ball. Calculate the velocity of the ball at t = 0.900s.
*Sunday, September 25, 2011 at 11:15pm by Fawad*

**physical science**

A frog jumps at the angle of 60% to horizontal with initial velocity of 10.0m/s 1. calculate velocity Voy of the frog 2 calculate acceleration ax of the frog
*Saturday, February 15, 2014 at 9:56am by lorrain*

**physical science**

A frog jumps at the angle of 60 degrees to horizontal with initial velocity of 10.0m/s 1. calculate velocity Voy of the frog 2 calculate acceleration ax of the frog
*Saturday, February 15, 2014 at 9:56am by lorrain*

**physics**

The position vector r of a particle moving in the xy plane is r=2ti+2sin[(pi/4)t]j , with is in meters and t in seconds. (a) Calculate the x and y components of the particle's position at , and 4.0 s and sketch the particle's path in the plane for the interval . (b) Calculate ...
*Sunday, March 10, 2013 at 3:34pm by Anonymous*

**Math**

An airplane is heading due south at a speed of 590km/h. If a wind begins blowing from the southwest at a speed of 65.0km/h (average). Calculate magnitude of the plane's velocity, relative to the ground. Calculate direction of the plane's velocity, relative to the ground. ...
*Saturday, September 12, 2009 at 1:15pm by Anne*

**Physics**

A stone that starts at rest is in free fall for 8.0 s. a.Calculate the stone's velocity after 8.0 s. b. What is the stone's displacement during this time? Given: t = 8.0 s a = 9.81 m/s^2 For a, in order to calculate the velocity, should i use d = vit + 1/2 at^2 and only use ...
*Friday, December 25, 2009 at 10:51pm by Priscilla*

**Science(applied physics)**

At time t=0,a 1kg ball is thrown up from the top of a tall tower with velocity Vo=18i+24j(m/s). a:calculate the components of th velocity at t=6s. b:Calculate the kinetic energy of the ball at t=6s.
*Sunday, February 17, 2013 at 6:20am by Bessy*

**Science(applied physics)**

At time t=0,a 1kg ball is thrown up from the top of a tall tower with velocity Vo=18i+24j(m/s). a:calculate the components of th velocity at t=6s. b:Calculate the kinetic energy of the ball at t=6s.
*Sunday, February 17, 2013 at 6:20am by Bessy*

**phys**

An airplane is heading due south at a speed of 590 km/h. If a wind begins blowing from the southwest at a speed of 65.0 km/h (average). Calculate magnitude of the plane's velocity, relative to the ground. Calculate direction of the plane's velocity, relative to the ground. ...
*Tuesday, September 15, 2009 at 4:18am by physics*

**6th grade**

Assume that the average speed of a moving object at 1 m was initial velocity and average spped of your cvart 5 m was its final velocity. calculate the change in velocity of your cart from 1 m to 5m. Show your work
*Friday, March 26, 2010 at 6:18am by Brittany*

**Physics**

A 8.00 multiplied by 107 kg battleship originally at rest fires a 1400 kg artillery shell horizontally with a velocity of +550 m/s. (a) If the shell is fired straight aft, there will be negligible friction opposing the ships recoil velocity. Calculate its recoil velocity. (b) ...
*Sunday, July 14, 2013 at 9:53pm by Amy*

**physics**

A bb player crouches lowering center of gravity 0.3m. when he jumps, center of gravity reaches 0.9m above normal. A. Calculate velocity when feet left ground. B. Calculate acceleration produced to achieve velocity. C. What force exerted on floor if mass is 110 kg?
*Monday, January 24, 2011 at 3:17pm by Scott*

**Science (Force and motion)**

Explain how acceleration can be slowing down. Calculate the impact force of a 50 kg object travelling at 100km/hr. (Momentum = mass x velocity) Calculate the momentum of a tennis ball of 50 g moving at a velocity of 25m/s.
*Tuesday, May 3, 2011 at 7:49am by maria*

**physics**

Conservation of linear momentum applies to the embedding process. Use that to calculate the velocity at impact, before swinging begins. Then use that velocity and conservation of energy to calculate how high it swings. V = sqrt (2 g H) and the height that is reaches is H = L (...
*Sunday, April 18, 2010 at 1:11am by drwls*

**physics**

A) Formula for average velocity for motion with constant acceleration. 1/2(initial velocity + final velocity) Therefore, 1/2(0 + 4.12) = 2.06 m/s B) Use the answer from above to calculate the total distance. 2.06 * 4.77 = 9.8262 meters.
*Thursday, November 17, 2011 at 5:35pm by Ronald*

**physics**

A cyclist is cycling at a uniform velocity of 8m/s for 8 seconds. He then stops paddling and the cycle comes to rest in next ten seconds. Draw the velocity-time graph and calculate: (i) the average retardation.(ii) the distance covered with uniform velocity.(iii) the distance ...
*Sunday, August 7, 2011 at 7:23am by aisha*

**Physics**

A car travels in a straight line with an average velocity of 80 km/hr for 2.5 hours and then with an average velocity of 40 km/hr for 1.5 hours. a. Calculate the largest displacement for the 4-hour trip. b. Calculate the largest average velocity for the total trip in ...
*Wednesday, August 28, 2013 at 9:54pm by K*

**physics!**

Calculate how long it takes for the ball to get to the goal post. Then calculate its vertical velocity component and elevation at that time. Compare the vertical position to 3.05 m to see if it cleared the bar. The sign of the vertical velocity component at that time will tell...
*Tuesday, December 9, 2008 at 9:49pm by drwls*

**Grade 11th Physics kinematics**

an aeroplane takes of at an angle of 45deg to the horizontal. If the vertical component of its velocity is 300kmph, Calculate its actual velocity. what is the horizontal component of it velocity?
*Friday, July 9, 2010 at 4:05pm by shruthi*

**11th matriculation physics kinematics**

an aeroplane takes of at an angle of 45deg to the horizontal. If the vertical component of its velocity is 300kmph, Calculate its actual velocity. what is the horizontal component of it velocity?
*Sunday, July 18, 2010 at 11:34am by shruthi*

**kinetics**

a ball of mass 200 g is thrown vertically upwards with a velocity of 20ms-1 ignoring air resistance. a) calculate the kinetic energy of the ball as it is released b)calculate the maximum height reached by the ball c) state the velocity of the ball when it returns to its ...
*Thursday, March 8, 2012 at 6:02pm by dmkp*

**kinetics**

a ball of mass 200 g is thrown vertically upwards with a velocity of 20ms-1 ignoring air resistance. a) calculate the kinetic energy of the ball as it is released b)calculate the maximum height reached by the ball c) state the velocity of the ball when it returns to its ...
*Friday, March 16, 2012 at 6:12am by dmkp*

**Astrology / Physics**

How do we calculate the radial velocity after the recession velocity is known?
*Monday, September 20, 2010 at 1:56pm by Alan*

**physics**

11) Correct 12) Separate the velocitie into vertical and horizontal components. Take the vertical velocity component and calculate how long the ball is in the air. Then, using that time and the horizontal component of the velocity, calculate the horizontal distance traveled. I...
*Tuesday, April 1, 2008 at 10:10pm by Quidditch*

**Physics**

How would someone calculate the average velocity of something from a velocity vs. time graph?
*Sunday, October 18, 2009 at 3:00pm by Phil*

**physics**

A train accelarates uniformly in a straight line at 0.3m/s^2 from rest. Calculate the velocity 15 seconds after its departure. Calculate time taken to reach 30km/h and calculate Distance covered by the train
*Sunday, April 7, 2013 at 10:16am by leslie*

**physics**

A 0.132kg baseball is dropped from rest. If the magnitude of the baseball's momentum is 0.811kg m/s just before it lands on the ground, from what height was it dropped? Calculate velocity from momentum. Then, knowing velocity at impact calculate height from v^2 = 2gh
*Tuesday, April 17, 2007 at 2:01am by Natash*

**Physics - Kinematics**

Need some help with my homework! Question 7 a) Acceleration is the rate of change of velocity Use your definition in (a) to show that v = u + at, where v is the final velocity, u is the initial velocity and a and t are the acceleration and the time interval respectively. State...
*Tuesday, April 17, 2012 at 4:01pm by Iman*

**Physics **

An electron with a horizontal speed of 4.0 * 10^6 m/s and no vertical component of velocity passes through two horizontal parallel plates. The magnitude of the electric field between the plates is 150 n/c the plates are 6.0 long A) calculate the vertical component of the ...
*Thursday, January 10, 2013 at 8:45am by Kara*

**Physics**

A cannon ball is fired with a velocity of 200 m\s2 at an < of 25° above ground. The total flight time is 45.6 seconds. (Neglect air resistance.) a. Calculate the initial horizontal\vertical components of the velocity b. Calculate maximum height of the cannon ball above ground
*Tuesday, October 23, 2012 at 7:23pm by Shannon*

**physics**

a 1600-kg vehicle moves with a velocity of 19.5 m/s. calculate the power required to reduce the velocity to 3.20 m/s in 11.0 s
*Monday, February 16, 2009 at 5:43pm by bob*

**physics**

A body strikes the ground vertically down wards with a velocity u and rebounds with the same speed.Calculate the change in velocity.
*Sunday, June 10, 2012 at 1:33am by Anonymous*

**Math**

The height (in feet) of a small weight oscillating at the end of a spring is h(t) = 0.5 cos(2t) where t is in seconds, 0 ≤ t ≤ 5. (This is calculus. Use radians!) (a)Calculate the weight’s average velocity over the time interval 1 ≤ t ≤ 3. Show clearly ...
*Wednesday, August 29, 2012 at 1:33pm by Dede*

**physics**

write down in terms of the mass m and the velocity v of the body, expressions for i) momentum ii) the kinetic energy use your answer to (b) to help calculate the mass and the velocity of the ball momentum is mass*velocity Kinetic energy is 1/2 mass*velocity squared.
*Monday, October 16, 2006 at 11:28am by Kim*

**physics**

a body moves with a uniform velocity of 2m/sec for 5 sec then velocity was uniformly accelerated and a velocity of 10m/sec was achieved in next 5 sec.then brakes were applied uniformly and body comes to rest in next 10 sec.calculate a)acceleration and retardation produced b)...
*Monday, May 28, 2012 at 2:35am by parul*

**physics**

Calculate how long it takes the block to reach the floor. 1.00 m = (g/2) t^2 t = 0.452 s Then calculate the horizontal velocity component as it leaves the edge of the table Vx = 1.8 m/0.452s = 3.98 m/s Then use conservation of momentum to get the velocity of the bullet, v. m v...
*Tuesday, November 23, 2010 at 11:32am by drwls*

**physics**

A leather ball of circumference 75.9 m and mass 557 g is forced to the bottom of a swimming pool and then released. After initially accelerating upward, it rises at a constant velocity. a) Calculate the buoyant force on the ball. b) Calculate the drag force the ball ...
*Monday, March 19, 2012 at 1:50pm by janny*

**Calculus**

Velocity is the derivative of y(t) V = dy/dt = 40 - 32 t Plug in t = 2 and calculate the velocity. It will be negative, meaning that the ball is on the way down at that tiome.
*Wednesday, June 30, 2010 at 8:12pm by drwls*

**science**

Motion and newton's laws. able to calculate acceleration rates. Distinguish Between speed and velocity. And why velocity is important. Help me please I'm not understanding this. Thank you
*Tuesday, January 24, 2012 at 11:52am by glenn help help help*

**Calculus - average velocity**

*VELOCITY OF A CAR* Suppose the distance s (in feet) covered by a car moving along a straight road after t sec is given by the function s = f(t) = 2t^2 + 48t. a. Calculate the average velocity of the car over the time intervals [20,21], [20, 20, 20.1], and [20, 20.01]. b. ...
*Sunday, September 21, 2008 at 4:07pm by B <3*

**physics**

A steel ball is dropped onto a hard floor from a height of 2.15 m and rebounds to a height of 2.09 m. (Assume that the positive direction is upward.) (a) Calculate its velocity just before it strikes the floor. -6.49 m/s (b) Calculate its velocity just after it leaves the ...
*Sunday, September 30, 2012 at 7:43pm by carlton*

**physics**

A man stands on the roof of a 19.0 m-tall building and throws a rock with a velocity of magnitude 30.0 m/sat an angle of 42.0 degrees above the horizontal. You can ignore air resistance. Calculate the maximum height above the roof reached by the rock. Calculate the magnitude ...
*Monday, September 14, 2009 at 11:06pm by lina*

**physics**

A 1600 kg vehicle moves with a velocity of 19.5 m/s. Calculate the power required to reduce the velocity to 3.20 m/s in 11.0 s. I don't know this one the only thing I know is p=w/t
*Thursday, April 3, 2008 at 5:27pm by Jon*

**Physics**

A car is stopped at a traffic light. It then travels along a straight road so that its distance from the light is given by x(t) = bt2 - ct3, where b = 2.60 m/s2 and c = 0.150 m/s3. (a) Calculate the average velocity of the car for the time interval t = 0 to t = 8.0 s. m/s (b) ...
*Friday, February 4, 2011 at 7:53pm by Anonymous*

**physics repost**

A 1600 kg vehicle moves with a velocity of 19.5 m/s. Calculate the power required to reduce the velocity to 3.20 m/s in 11.0 s. I don't know this one the only thing I know is p=w/t
*Friday, April 4, 2008 at 12:09pm by Jon*

**UST PHYSICE**

a body of mass 6kg is whirled in a horizontal circle of radios 1.5m with a uniform velocity 3m/s. calculate 1. the angular velocity 2. the centripetal acceleration.
*Tuesday, November 15, 2011 at 8:02am by Anaebo*

**Physics**

The function ax(t) describes the acceleration of a particle moving along the x-axis. At time t=0, the particle is located at the position x0 and the velocity of the particle is zero. ax(t)=a0e−bt The numerical values of all parameters are listed below: x0=980 m a0=500 ...
*Saturday, September 1, 2012 at 12:46pm by Natalie*

**physics**

The x-component of the velocity, Vx (0.57 m/s) will not change with time. The y-component: Use F=ma to calculate the acceleration in the y-direction. (F=0.31 N, m=4.1 kg) Initial velocity, v0=0 velocity Vy(t) as a function of time in seconds Vy(t) = v0.t + (1/2)at² ...
*Wednesday, September 23, 2009 at 6:06pm by MathMate*

**Physics**

A man stands on the roof of a 19.0 m-tall building and throws a rock with a velocity of magnitude 24.0 m/s at an angle of 38.0 degrees above the horizontal. You can ignore air resistance. Calculate the maximum height above the roof reached by the rock. got it.... 11.1 m ...
*Saturday, September 16, 2006 at 5:26pm by Josh*

**physics**

A basketball player crouches while waiting to jump for the ball. He lowers his center of gravity is 0.30 m. When he jumps for the ball, his center of gravity reaches a height of 0.90 m above its normal position.(a) Calculate the velocity of the player when his feet left the ...
*Sunday, January 23, 2011 at 2:43pm by Tezara *

**Math **

If we calculate using velocity, we have to establish a positive direction. If velocity is measured as positive downstream, then v = current velocity (downstream) and going upstream, the net velocity is v-16, and downstream the net velocity is v+16. Since the total distance ...
*Thursday, September 16, 2010 at 12:47am by MathMate*

**physics**

A car is stopped at a traffic light. It then travels along a straight road so that its distance from the light is given by x(t) = bt2 – ct3, where b = 2.40m/s2 and c = 0.120m/s3. (a) Calculate the average velocity of the car for the time interval t = 0 to t = 10.0 s. (b) ...
*Tuesday, October 12, 2010 at 1:34am by Anonymous*

**physics**

A cyclist is cycling at uniform velocity of 8m/sec for 8 sec then applies brakes and cycle come to rest in next 10 sec. calculate a)Distance traveled by uniform velocity. b)distance traveled by non-uniform velocity c)total distance traveled d)the average velocity in entire ...
*Sunday, May 27, 2012 at 10:23am by parul*

**physics**

calculate the velocity of the bullet/block combined mass with the conservation of momentum equation. Now, knowing the velocity, you can set finalPotentailEnergy=initialKineticenergy mgh=1/2 m v^2 and solve for height h.
*Monday, November 3, 2008 at 12:05am by bobpursley*

**Physics**

a) I cant sketch it. Uniform acceleration means a linear increase of velocity (slope=acceleration). brakes mean a decrease in velocity, again, slope= acceleration. b.calculate it. c. distance= average velocity*time d. steering wheel, accelerator, brakes,
*Saturday, October 23, 2010 at 8:58pm by bobpursley*

**Physics**

The issue is really direction. Find anagular displacement at those times theta=w*t=2PI/34 *t then, calculate each theta (radians), and velocity will be perpendicular to that angle. Angle for velocity=theta+PI/2 Acceleration will be at -theta, alwas inward. If you want velocity...
*Tuesday, December 17, 2013 at 7:26am by bobpursley*

**physics**

You need to know the velocity of the marble (horizontal), and the height of the table. From the height of the table, you calculate the time ittakes to fall that distance (H=1/2 g t^2), then use that time to calculate how far horizontally the marble went(distance=velocity*time)
*Saturday, January 8, 2011 at 9:20pm by bobpursley*

**physics**

a bullet of mass 30 g. is fired from a pistol of 2.1kg at a velocity of 300 m/s calculate the recoil velocity of the pistol
*Saturday, August 4, 2012 at 7:12am by sumit*

**Physics**

object A of mass 3g with a velocity of 12cm/s to the east, collides with stationary object B. After collision, object A rebounds with a velocity of 10cm/s to the west and object B has a velocity of 1.5cm/s to the east. Calculate the mass of obeject B
*Wednesday, May 9, 2012 at 9:08pm by Sarah*

**Physics**

Use bernoulli's equation to find the velocity of the water leaving when the depth is the full cup. From height of the hole (assume vertical free fall), and velocity, calculate horizontal distance.
*Sunday, July 1, 2012 at 4:58pm by bobpursley*

**Physics - Waves**

frequency=40/30 hz wave velocity= 4.25m/10 sec frequency*wavelength=wavevelocity calculate velocity
*Monday, January 26, 2009 at 8:50pm by bobpursley*

**Physics**

Calculate the power requirement , 57 * 745 Watts. That equals the resistance force times the velocity, if the velocity is in m/s. Solve for the force. It will be in Newtons.
*Thursday, October 18, 2012 at 9:36pm by drwls*

**Math**

Use the law of conservation of momentum to get the bullet velocity. You will need the velocity of the block after impact, before it swings upward. You need to be more specific about whether the 10 cm of motion is vertical or horizontal. If it moves H = 10 cm up, then you can ...
*Thursday, April 2, 2009 at 8:42pm by drwls*

**Physics**

Two cars are travelling in the same direction along a street. Car A collides with Car B and they lock together. Calculate tgeur velocity after the collision. Before: Car A: mass of 1001kg. Velocity of 12m/s Car B: mass of 1200kg Velocity of 10m/s After: V=?
*Sunday, February 13, 2011 at 7:32am by Laureen*

**physics**

1.A body with an initial velocity of 18km/hr accelerates uniformly at the rateof 9cm/sec2over a distance of 200m.Calculate, a)the acceleration in m/sec2 b)its final velocity in m/s 2.The distance travelled by a body moving with uniform acceleration in the nth second is given ...
*Saturday, May 19, 2012 at 1:32am by srikar*

**ALGEBRA - Proportional**

The velocity ( v meters per second ) of a body is known to be proportional to the sqaure root of it's kinetic energy ( e ejoules). When the velocity of a body is 120m/s it's kinetic energy is 1600J. Write down the relationship between v , e using k as the constant of varation...
*Monday, November 5, 2007 at 2:07pm by AMY*

**Physics**

You know displacement and final velocity of an object starting from rest. Use the relevant mechanics equations: s = (at^2)/2 v = at Where: s=0.015[m] and v=4100[m/s] Rearranging the velocity equation to give an expression for time taken (t). Use this to substitute for t into ...
*Saturday, September 7, 2013 at 12:56am by Graham*

**Physics**

If a bird moves with an initial velocity of 30secs and accelerates at the rate of 40m/s to cover a distance of 70km/hrs.Calculate the final velocity of the bird?
*Thursday, March 3, 2011 at 11:32pm by Phillip*

**physics**

A car starts from rest and accelerates uniformly along a straight horizontal road at 3 metres second squeared for 4 seconds,after which it continues with a constant velocity for a further 6 seconds.CALCULATE THE MAGNITUDE OF THE MAXIMUM VELOCITY OF THE CAR, THAT IS THE ...
*Saturday, September 3, 2011 at 9:56am by Anonymous*

**Physics**

A major leaguer hits a baseball so that it leaves the bat at a speed of 28.0 and at an angle of 36.9 above the horizontal. You can ignore air resistance. At what two times is the baseball at a height of 9.50 above the point at which it left the bat? Calculate the horizontal ...
*Monday, September 17, 2012 at 9:34pm by JACK - please HELP*

**Physics**

calculate velocity in the fifth second and the 8th second. veloicty(t=5)=25m/1sec velocity(t=8)=40m/s acceleration=changevelocity/time=15m/s/(3sec) =5m/s^2
*Wednesday, July 4, 2012 at 12:43pm by bobpursley*

**Physical science**

Try some of th following links for velocity-time graphs: http://search.yahoo.com/search?fr=mcafee&p=how+to+calculate+velocity-time+graph+of+a+falling+motion Sra
*Tuesday, January 18, 2011 at 12:54pm by SraJMcGin*

**Physics**

A ball is thrown vertically upward, starting at y = 0, with a velocity of 15.0 m/s. (a) Calculate the maximum vertical displacement of the ball. (b) Calculate the time required for the ball to reach its highest point. (c) What is the ball's acceleration when it is at its ...
*Sunday, September 25, 2011 at 11:17pm by Fawad*

**Physics**

A proton collides head on with a helium atom at rest. Their combined velocity after the collision is 8 x 10^5 ms^-1. Calculate the initial velocity of the proton. *** HELP PO PLEASE!!
*Thursday, January 31, 2013 at 1:26am by Carolyn Bautista*

**Physics**

A proton collides head on with a helium atom at rest. Their combined velocity after the collision is 8 x 10^5 ms^-1. Calculate the initial velocity of the proton. *** HELP PO PLEASE!!
*Thursday, January 31, 2013 at 1:27am by Carolyn Bautista*

**Physics**

A proton collides head on with a helium atom at rest. Their combined velocity after the collision is 8 x 10^5 ms^-1. Calculate the initial velocity of the proton. *** HELP PO PLEASE!!
*Thursday, January 31, 2013 at 1:28am by Carolyn Bautista*

**physics**

a motor car accelerate for 10sec to attain a velocity for 20msec it comtinue with uniform velocity for a further 20sec and then disccelerate so that it stop in 20sec,calculate.(1)acceleration,(2)deceleration
*Monday, October 21, 2013 at 2:10pm by ope*

**chemistry**

calculate r.m.s velocity of he molecule at 300k.also calculate the total k.e(in calories)of the molecules in one litre he at 300k & 1atm?
*Friday, July 6, 2012 at 1:58am by dip*

**physics**

A 2.0 kg particle is moving along the x axis to the left with a velocity of v= -6.0 m/s. Suddenly, between times t =0 and t = 4.0 x a net force = 3t^2 – 12t is applied to the particle, where F is in N and t is in s. Calculate the velocity of the particle at t=4.0 s. Is this ...
*Monday, November 23, 2009 at 10:39pm by Ashley*

**physics!**

Calculate how far he travels horizontally before falling 2.5 meters. If the result is 4.0 m or more, he survives the jump. The horizintal distance travelled equals the horizontal jumping velocity component (5.0 cos 15 m/s) times the time it takes to fall 2.5 m. To calculate ...
*Tuesday, December 9, 2008 at 9:51pm by drwls*

**science**

A man stands on the roof of a building of height 15.8m and throws a rock with a velocity of magnitude 25.2m/s at an angle of 32.7∘ above the horizontal. You can ignore air resistance. Part A Calculate the maximum height above the roof reached by the rock. y = 9....
*Sunday, March 2, 2014 at 5:20am by sanele*

**science**

At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by è = (198 rad/s)t – (24 rad/s2)t2 – (2 rad/s3)t3 (15 marks) a. At what time is the angular velocity of the motor shaft zero? b. Calculate the angular ...
*Saturday, April 27, 2013 at 11:56pm by bruce*

**physics**

2. At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by θ = (198 rad/s)t – (24 rad/s2)t2 – (2 rad/s3)t3 a. At what time is the angular velocity of the motor shaft zero? b. Calculate the angular ...
*Saturday, April 27, 2013 at 1:06am by bruce*

**projectiles**

a small brick mass 700 g is projected vertically downwards at a velocity of 1,25(m/s) from the top of a building of height 25m.calculate the magnitude of the velocity at which the brick hits the ground?
*Saturday, February 15, 2014 at 4:43am by Anonymous*

**physics**

4) An aircraft has a landing velocity of 50 ms-1 and decelerates uniformly at 10 ms-2 to rest . Calculate: (a) the time taken to slow down to this velocity (b) the distance covered during the deceleration
*Wednesday, February 8, 2012 at 4:41pm by CL*

**physical sciences**

a small brick mass 700 g is projected vertically downwards at a velocity of 1,25(m/s) from the top of a building of height 25m.calculate the magnitude of the velocity at which the brick hits the ground?
*Saturday, February 15, 2014 at 4:44am by Anonymous*

**physics**

A soccer ball is kicked with an initial speed of 10.8 m/s in a direction 24.9° above the horizontal. Calculate the magnitude of its velocity 0.310 s after being kicked. What was its direction? Calculate the magnitude of its velocity 0.620 s after being kicked. What was its ...
*Thursday, September 5, 2013 at 11:25am by Anonymous*

**physics**

A soccer ball is kicked with an initial speed of 10.8 m/s in a direction 24.9° above the horizontal. Calculate the magnitude of its velocity 0.310 s after being kicked. What was its direction? Calculate the magnitude of its velocity 0.620 s after being kicked. What was its ...
*Thursday, September 5, 2013 at 11:28am by Anonymous*

**PHYSICS**

Calculate the downward velocity V1 when it hits the floor: V1 = sqrt (2gH), where H = 1.25 m Then calculate the upward velocity after the bounce: V2 = sqrt (2gH'), where H' = 0.96 m The momentum change is M(V1 + V2), since the V's are in opposite directions. The momentum ...
*Saturday, March 29, 2008 at 4:39pm by drwls*

**Physical science**

A 50 kg pole vaulter falls from rest from a height of 5 meters onto a foam rubber pad. The pole vaulter comes to rest 0.22 seconds after landing on the pad. Calculate the athlete's velocity just before reaching the pad. Answer in m/s. I am so confused about which formula to ...
*Monday, February 25, 2008 at 10:01am by Anonymous*

**physics**

The vertical component of velocity when the rock is thrown is 30 sin 42 = 20.07 m/s Calculate the time T that it takes the rock to hit the ground using that initial velocity. Hint: 20.07 T - (g/2) T^2 + 19.0 = 0 I assume you know what g is, and how to solve that quadratic ...
*Monday, September 14, 2009 at 11:06pm by drwls*

**Help with Physics PLEASE**

A body of mass 2kg moving with a velocity of 6m/s collite with a stationary object of mass 500gm if the two bodies move together after Impact. Calculate their common velocity
*Wednesday, October 12, 2011 at 7:36pm by oluwashola*

**Physics**

A 0.255 kg ball was thrown vertically upward from a bridge 10.3 meters above the ground with an initial velocity if 31.7 meters/second. Calculate the balls velocity when it hits the water.
*Monday, February 18, 2013 at 6:46pm by Billy johnson*

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