Friday

July 31, 2015

July 31, 2015

Number of results: 12,930

**physics**

car a with mass of 1250kg, is traveling at 30 m/s to the east. car b is a truck with mass of 2000kg, traveling to the west at 25m/s. assume these two vehicles experience an inelastic collision but do not stick together and car a goes off 10m/s to the west. what will be the ...
*January 18, 2013 by mauro dar*

**Physics**

A rescue helicopter is lifting a man (weight = 797 N) from a capsized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 0.711 m/s2? (b) What is the tension during the remainder of the rescue when ...
*March 20, 2013 by Kelly*

**Physics**

A rescue helicopter is lifting a man (weight = 797 N) from a capsized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 0.711 m/s2? (b) What is the tension during the remainder of the rescue when ...
*March 20, 2013 by Heather*

**Science - Please Check my Answer**

My problem: A swimmer travels from the south end to the north end of a 30.0 m pool in 15.0 s and makes the return trip to the starting position in 19.0 s. What is the average velocity for the second half of the swim? My answer: 1.60 m/s to the south Please check! I will really...
*February 27, 2014 by Brady*

**Physics**

A wheel of moment of inertia 0.136 kg · m2 is spinning with an angular speed of 5000 rad/s. A torque is applied about an axis perpendicular to the spin axis. If the applied torque has a magnitude of 67.8 N · m, the angular velocity of precession will be? Please help me solve ...
*March 28, 2014 by kjean*

**physics**

A jet plane is flying horizontally with a speed of 500 m/s over a hill that slopes upward with a 3% grade (i.e., the "rise" is 3% of the "run"). What is the component of the plane's velocity perpendicular to the ground? (Assume the +x-direction is up along the slope and the +y...
*May 24, 2014 by Soh*

**Physics**

A cord 0.65m long exerts a centripetal force of 23N on a whirling 2kg mass tied to the end of the cord. What is the velocity of the whirling mass? Round to nearest tenth. For this problem, I used to formula V = square root of f/rm. I did the square root of 23/0.65(2) = 8.4m/s^...
*October 31, 2014 by Rose*

**Physics**

A small bag of sand is released from an ascending hot-air balloon whose upward constant velocity is v0 = 1.45 m/s. Knowing that at the time of the release the balloon was 70.3 m above the ground, determine the time, τ, it takes the bag to reach the ground from the moment ...
*February 2, 2015 by Breauna*

**Physics**

A simple wheel and axle is used to life a bucket out of a well. The radii of the wheel and axle are 20 cm and 4 cm, respectively. Determine: 1. The velocity ratio (and so the IMA), 2. The thoretical effort required to life a load of 30 N assuming no energy loosses, 3. The ...
*March 5, 2015 by Eleni*

**physics**

Two 75.0 kg hockey players skating at 5.60 m/s collide and stick together. If the angle between their initial directions was 115°, what is their velocity after the collision? (Let the motion of player 1 be in the positive x-direction and the motion of player 2 be at an angle ...
*April 17, 2015 by alexa*

**physics**

a 2000kg car travelling west with a speed of 20m/s collides at an intersection with a 3000kg car travelling south at a speed of 20m/s. find the direction and magnitude of the velocity of the wreckage after the collision, assuming the collision was perfectly inelastic(that is, ...
*July 7, 2015 by Mostafa*

**Physics**

A cannon is mounted on a truck that moves forward at a speed of 5 m/s. The operator wants to launch a ball from a cannon so the ball goes as far as possible before hitting the level surface. The muzzle velocity of the cannon is 50 m/s. What angle from the horizontal should the...
*February 17, 2013 by Brian*

**PHYSICS**

A particle confined to motion along the x axis moves with constant acceleration from x = 2.0 m to x = 8.0 m during a 2.5-s time interval. The velocity of the particle at x = 8.0 m is 2.8 m/s. What is the acceleration during this time interval?
*September 15, 2008 by Ami*

**Science**

A car of mass m travelling at 20 m/s east on a straight level road and a truck of mass 2m travelling at 20 m/s west on the same road. What is the velocity of the car relative to the truck?
*February 7, 2013 by Melvin*

**physics**

A tallest vocano in the Solar System is the 24 km tall Martian volcano, Olympus Mons. Assume an astronaut drops a ball off the rim of the crater and that the free fall acceleration remains constant throughout the ball's 24 km fall at a value of 3.7m/s^2. Find (a) the time for ...
*September 15, 2007 by Anonymous*

**physics**

james made a very nice play on 13 hole on 2011 master's open. he made driver shot with initial velocity 200 m/s. the ball has a mass of 46g. its lunching angle is 28 degrees from the ground. draw the trajectory (x-y graph) with and without air resistance. the air resistance is...
*May 2, 2011 by sam*

**trigonometry**

4.if cotθ = -√15/7 , use the fundamental identities to find cosθ > 0 9.A projectile is fired with an initial velocity of 88 ft/sec at an angle of 35° to the horizontal. Neglecting air resistance, what is the time of impact? (Round to the nearest tenth of a...
*December 13, 2012 by Emily*

**physics**

A bicyclist moving at a constant speed takes 10.0 seconds to travel 500 meters down a path inclined 30.0° downward from the horizontal. What is the vertical velocity of this motion?Select one of the options below as your answer: A. 18.3 meters/second B. 43.3 meters/second C. ...
*May 25, 2012 by Anonymous*

**Physics**

If a rod is moving at a velocity equal to 1/2 the speed of light parallel to its length, what will a stationary observer observe about its length? The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the ...
*October 23, 2012 by Laurie*

**physical**

A 0.8 kg block of wood has an initial velocity of 0.25 m/s as it begins to slide across a table. The block comes to rest over a distance of 0.72m. a) what is the average frictional force on the block? b)How much work is done on the block by friction? c)How much work is done on...
*August 17, 2012 by sara*

**science**

a bicyclist and his bike have a combined mass of 105 kg. He is traveling at 15.0 m/s along the path when he sees a fallen tree 4 m in front of him. In order to stop before hits the tree, find the boy's minimum acceleration and the minimum force that must be applied. Thank You...
*December 30, 2006 by leafprincess*

**Physics**

A robot probe drops a camera off the rim of a 239 m high cliff on Mars, where the free-fall acceleration is -3.7 m/s^2. a) Find the velocity with which the camera hits the ground. b) Find the time required for it to hit the ground. Ok so I'm not even sure of which equation to ...
*September 25, 2007 by Lindsay*

**Physics**

(a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States in one year is about 9.33e9 Joules...
*November 2, 2008 by Kyle*

**Physics**

A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 3.9 s later. If the speed of sound is 340 m/s, how high is the cliff? i know you use the equation y=(initial velocity)(time) + (1/2)(acceleration)(time^2) but I'm having problems putting all the...
*July 2, 2012 by Marissa*

**PHYSICS 1 ..'''''''''''''''''''''''' helllpppppppp**

The “Vomit Comet.” In Zero-gravity astronaut training equipment testing, NASA ﬂies a KC135A aircraft along a parabolic ﬂight path. As shown in Figure P4.47, the air-craf climbs from 24000ft to 31000ft,where it enters a parabolic path with a velocity of 143m/s at ...
*January 9, 2013 by JORHO*

**Physics **

I need to determine maximum tension/down force with a pendulum. I need to use the lightest string possible to: -support a 16kg bob, with -a velocity of 4m/s -with a swing radius of 2m -at it's equilibrium (ie 0 degrees) -given standard gravity. using T=m(V^2/r)+(g*cos(x)) The ...
*October 7, 2014 by Matt*

**Physics**

A young girl (m= 30 kg) rides a skateboard (m= 3.2 kg) at a speed of 4.2 m/s. (a) How much work does the girl have to do to bring herself to a stop? (b) How far does she travel if it takes 6.0 s to stop? (c) What is the magnitude of the stopping force? So I know W=Fd but I am...
*October 9, 2014 by Marin*

**Physics**

Hi! i am going to apply for a medical study admission test and where just wondering if you guys could help me to come up with the formula for solving this problem. I am not looking for a answer, just the mathematical formula to solve theese kind of questions. The question is ...
*May 13, 2015 by Marius*

**Physics**

A model rocket is launched vertically upward from the ground. After 4.3s, its fuel is completely burned. Assume uniform acceleration of 3.0 m/s2 while the fuel is burning. What is the velocity of the rocket at the instant that the fuel is completely burned? What's the rocket's...
*January 4, 2012 by Leasha*

**Physics**

1. On a spacecraft, two engines are turned on for 648 s at a moment when the velocity of the craft has x and y components of v0x = 4360 m/s and v0y = 6270 m/s. While the engines are ﬁring the craft undergoes a displacement that has components of x = 4.11 × 106 m and y...
*October 1, 2012 by Thomas*

**math **

a rock is thrown straight up in the air from an initial height of ho, in metres, with the initial velocity vo, in metres per second. The height in metres above the ground after t seconds is given by h(t) = -4.9t^2 + vo + ho. Find an expression for the time it takes the rock to...
*November 29, 2013 by Kp*

**Physics**

What value of F can pull the 5.00 kg box at constant velocity up the incline plane if uk=0.25. uk is coefficient friction 5.00 is upward and the incline angle is 30 degrees Assume that the F force is applied parallel to the incline. F must equal the sum of the weight component...
*September 18, 2006 by Êæâù*

**Physics**

You are taking a road trip to the beach for Spring Break. You leave at 12:00 pm. At 12:30 you stop for lunch 10 miles down the roads. You get back on the road and travel 75 more miles and realize that you need to stop for gas. You notice that it is now 1:10 pm. At the point in...
*April 8, 2009 by Landon*

**Physics**

Cybertron, the home of the Transformers, is 4.3 light yeras away from Unicron, a transforming planet. Omega Supreme, an Autobot rocket ship, travels this distance with constant velocity of .6c relative to Cybertron. Compare the time it takes for the trip as seen by the ...
*May 6, 2009 by Anonymous*

**math**

a math professor is thrown off the matthews bridges, height 240ft, by a disgruntled calculus class with an intitial upward velocity of 10ft/s a) assumign the acceleration dude to gravity is -32ft/s^2,find the macimum height of the professor. b) find the time before the ...
*April 20, 2010 by miley*

**math**

a math professor is thrown off the matthews bridges, height 240ft, by a disgruntled calculus class with an intitial upward velocity of 10ft/s a) assumign the acceleration dude to gravity is -32ft/s^2,find the macimum height of the professor. b) find the time before the ...
*April 20, 2010 by piper*

**math**

math professor is thrown off the matthews bridges, height 240ft, by a disgruntled calculus class with an intitial upward velocity of 10ft/s a) assumign the acceleration dude to gravity is -32ft/s^2,find the macimum height of the professor. b) find the time before the ...
*April 20, 2010 by piper*

**Physics**

You toss a coin straight up into the air. Sketch the velocity-time and acceleration-time graphs of the coin from the instant it leaves your hand until the instant it returns to your hand. Assume that the positive y direction is upward. Indicate on your graph the moment when ...
*September 29, 2010 by Cristina*

**physics**

A ball is thrown up onto a roof, landing 4.50 s later at height h = 20.0 m above the release level. The ball's path just before landing is angled at θ = 54.0˚ with the roof. (a) Find the horizontal distance d it travels. What are the (b) magnitude and (c) angle (...
*February 23, 2011 by Bob*

**physics**

An object with mass 3.0 kg is attached to a spring with spring stiffness constant k = 300 N/m and is executing simple harmonic motion. When the object is 0.020 m from its equilibrium position, it is moving with a speed of 0.55 m/s. (a) Calculate the amplitude of the motion. m...
*March 7, 2012 by Nicole*

**Math**

13. A catapult launches a boulder with an upward velocity of 148 ft/s. The height of the boulder (h) in feet after t seconds is given by the function h = –16t² + 148t + 30. How long does it take the boulder to reach its maximum height? What is the boulder’s maximum height? ...
*March 11, 2013 by Jim*

**physics**

In an Atwood machine m1 = 2.00 kg and m2 = 6.50 kg. The masses of the pulley and string are negligible by comparison. The pulley turns without friction and the string does not stretch. The lighter object is released with a sharp push that sets it into motion at vi = 2.20 m/s ...
*October 21, 2009 by blair*

**physics**

A cart starts from position one with a velocity of 17.0 m/s. Find the speed of the cart at positions 2 and 3 ignoring friction. will the cart reach position four? position 2= 12.0 m high position 3= 2.0 m high 4= 20.m high
*October 26, 2010 by Ali*

**Physics**

Two balls (Ball 1 and Ball 2) are released from the top of a tower. Ball 2 is thrown 3.14 seconds after Ball 1 is dropped. Ball 2 is thrown downward with a velocity of 3.49 m/s. Determine how far Ball 1 has fallen (to two decimal points) by the time Ball 2 is thrown.
*September 12, 2012 by Ashley*

**Physics Gravitational Force**

Geosynchronous satellites orbit the Earth at a distance of 42000km from the Earth's center. Their angular velocity at this height is the same as the rotation of the Earth, so they appear stationary at certain locations in the sky. What is the force acting on a 1500kg satellite...
*November 20, 2008 by Angeline*

**physics**

A spring (k=80n/m) lies on a frictionless table, one end connected to the wall, the other to a 4kg block. The block is pulled, stretching the spring .5m. and then released. A) max elastic potential energy of system? b) total energy? C) what is the acceleration of the block at ...
*January 30, 2014 by Amina*

**physics**

Two forces, 1 = (3.85 − 2.85) N and 2 = (2.95 − 3.65) N, act on a particle of mass 2.10 kg that is initially at rest at coordinates (−2.30 m, −3.60 m). (a) What are the components of the particle's velocity at t = 11.8 s? = m/s (b) In what direction is ...
*March 7, 2014 by Anonymous*

**aeronautic**

A small wind tunnel is being built for studying insect flight. The first test section built has a uniform height h=0.1m and length ℓ=1m. During operation its walls are found to have boundary layers which effectively start at the inlet at x=0 (the BL growth is negligible ...
*April 15, 2014 by JuanPro*

**math**

If an object is fired upward from the top of a tower at a velocity of 80 feet per second, the tower is 200 ft high, the formula is h(t)=-16t^2+80t+200, t is time h is height, how long after it is fired does the object reach the max height? It is like a quadratic equation
*October 23, 2007 by shila*

**Physics**

A block slides down a frictionless plane having an inclination of 14.3°. If the block starts from rest at the top and the length of this incline is 1.77 m, find the acceleration of the block. b)What is the block's speed when it reaches the bottom of the incline? i found the ...
*October 26, 2008 by Anonymous*

**physics**

A 1.6 kg disk with radius 0.63 m is rotating freely at 55 rad/s around an axis perpendicular to its center. A second disk that is not rotating is dropped onto the first disk so that their centers align, and they stick together. The mass of the second disk is 0.45 kg and its ...
*June 9, 2010 by MD*

**phy**

A boat can travel 2.60 m/s in still water.If the boat points its prow directly across a stream whose current is 1.10 m/s, what is the velocity (magnitude and direction) of the boat relative to the shore? What will be the position of the boat, relative to its point of origin, ...
*September 5, 2010 by ami*

**Physics **

On a planet that has no atmosphere, a rocket 14.2 m tall is resting on its launch pad. Freefall acceleration on the planet is 4.45 m/s2. A ball is dropped from the top of the rocket with zero initial velocity. (a) How long does it take to reach the launch pad? (b) What is the ...
*October 20, 2010 by Maria *

**physics**

Miguel, the 72.0 kg bullfighter, runs toward an angry bull at a speed of 4.00 m/s. The 550 kg bull charges toward Miguel at 12.0 m/s amd Miguel must jump on the bull's back at the last minute to avoid being run over. What is the new velocity of Miguel and the bull as they move...
*October 31, 2010 by brent*

**Physics - momentum**

Two hockey players are traveling at velocities of v1 = 15 m/s and v2 = -16 m/s when they undergo a head-on collision. After the collision, they grab each other and slide away together with a velocity of -3.8 m/s. Hockey player 1 has a mass of 121 kg. What is the mass of the ...
*November 14, 2010 by J Velji*

**physics**

A parachutist with a camera, both descending at a speed of 13 m/s, releases the camera at an altitude of 57.8 m. What is the magitude of the velocity of the camera just before it hits the ground? The acceleration of gravity is 9.8 m/s 2 and air friction is negligible. Answer ...
*October 26, 2011 by asdfghjkl;*

**trig**

In a computer simulation, a satellite orbits around Earth at a distance from the Earth's surface of 2.1 X 104 miles. The orbit is circular, and one revolution around Earth takes 10.5 days. Assuming the radius of the Earth is 3960 miles, find the linear speed (velocity) of the ...
*March 17, 2012 by John*

**AP Physics**

A parachutist with a camera, both descending at a speed of 9.2 m/s, releases the camera at an altitude of 32.3 m. What is the magitude of the velocity of the camera just before it hits the ground? The acceleration of gravity is 9.8 m/s 2 and air friction is negligible. Answer ...
*September 11, 2012 by Noah*

**physics**

Car a with a mass of 1250kg is travelling at 30m/s to the east. Car b is a truck with a mass of 2000kg, travelling to the west at 25m/s. Assume these two vehicles experienc an inelastic collision but do not stick together and car a goes off 10m/s to the west what will be the ...
*October 3, 2013 by David*

**Math**

A projectile is launched from a cannon that sits 4 feet off the ground at an initial velocity of 120 ft/sec. Find the position function and how long is it before the projectile hits the ground? I got -16t^2 +120t+4 for my position function, but I'm not sure how to find the ...
*November 12, 2013 by Kristen*

**Physics**

Jeron has a tendency to drop his bowling ball upon release when bowling. Instead of having the ball on the floor at the completion of his swing, Jeron lets go of the ball 0.35m above the floor. If he throws the ball with a horizontal velocity of 5.3m/s, what distance does it ...
*October 31, 2014 by Taylor*

**physics**

A planet with a mass of (7*10^21) kg is in a circular orbit around a star with a mass of (2*10^30) kg. The planet has an orbital radius of (3*10^10) m. (a) What is the linear orbital velocity of the planet? (b) What is the period of the planet's orbit? (c) What is the total ...
*October 30, 2011 by mymi*

**Physics**

A 7.50 kg bowling ball strikes a stationary 4.50 kg bowling ball. After the collision, the 4.50 kg ball is traveling 8.50 m/s 30.0° east of north; the 7.50 kg ball is traveling 6.50 m/s 20.0° south of east. What was the initial velocity (magnitude and direction) of the 7.50 kg...
*June 12, 2014 by Anonymous*

**chemistry**

A starship is crusing the interstellar with a velocity of 2174.799173 miles per second. How far would the starship have traveled in 2 years, 9 days and 4.50 hours? I've spent several hours on this problem and still I cannot come up with the correct answer. So, how do I solve ...
*September 29, 2007 by pat*

**Physics - check my work**

A cannon is fired from a cliff 190 m high downward at an angle of 38o with respect to the horizontal. If the muzzle velocity is 41 m/s, what is its speed (in m/s) when it hits the ground? Please check my work. I think it’s wrong, but I don’t know where I’m messing up… Vx = 41 ...
*November 9, 2007 by Lindsay*

**Physics(check)**

11)A race car travels on a racetrack at 38 m/s and slows at a constant rate to a velocity of 20 m/s over 10 s. How far does it move during this time? I don't know 12)The speed of a body is the distance traveled per unit time. Which of the following would be SI units of speed? ...
*March 30, 2008 by Jon*

**Calculus/Physics**

A stone is thrown from a cliff top with an upward velocity of 20 m/s. It takes 7 seconds for the stone to hit the ground at the bottom of the cliff. How high is the cliff? I know you use the equation of motion S(t)= (So)+(Vo)t-(1/2)gt^2 S(20)= (So) + 140 - 240.1 (So) = -100.1 ...
*July 8, 2010 by Elisabeth*

**Physics**

Now assume that the pitcher in Part D throws a 0.145-kg baseball parallel to the ground with a speed of 32 m/s in the +x direction. The batter then hits the ball so it goes directly back to the pitcher along the same straight line. What is the ball's velocity just after ...
*October 24, 2010 by Eden*

**Calculus**

The position of a particle moving along the x-axis is given by s(t)=2t2+4. Use difference quotients to find the velocity v(t) and acceleration a(t), filling in the following expressions as you do so: v(t)=limh->0 [_____ / h ] = ____ a(t)=limh->0 [ ____ / h ] = _____ ok ...
*February 22, 2011 by Cecille*

**Calcuslus-Calculus-Calculus **

A rocket arises from its launching pad with a velocity given. By 0.1 h m/s ,where h m is the height reached by the rocket at that time.the rocket is obserrvved from 2000 m away from the launch pad.at. What rate is the distance of the roocket from observer channging when the ...
*March 16, 2011 by Mehak*

**Physics**

A football was thrown from the line of scrimmage with a velocity of 30 m/s at an angle of 30o above the horizontal. (a) Determine the time required by the ball to reach the maximum height of its flight path. (b)Determine the distance from the line of scrimmage that a receiver ...
*June 24, 2012 by Aria*

**Chemistry/Math**

I'm not sure how to approach this problem. The teacher wants volumetric flow rate (in cm). A commonly used rule of thumb is that average velocity in a pipe should be about 1 m/s or less for "thin"(viscosity about water). If a pipe needs to deliver 6,000 m^3 of water a day, ...
*August 31, 2012 by Angel*

**gas**

water shoots from the mouth of a tall gargoyle fountain straight into the air with an initial velocity of 37 feet per second. It take the water 5 seconds to travel through the air and actually falls past the point from which it came, splashing down onto the ground. how tall is...
*October 8, 2012 by qdhad*

**physics**

A firecracker explodes, sending pieces of equal mass in three directions as shown in the diagram. Angle θ is 14 degrees, and angle ϕ is 30 degrees. Assume that the firecracker is initially at rest, and take upward and rightward as the positive directions. What are ...
*July 4, 2014 by Anonymous*

**Physics**

A motorcyclist who is moving along an x-axis has an acceleration given by a=(6.47-2.15t) for 0 >= t <= 6.0 s, where a is in m/s2 and t is in seconds. At t = 0, the velocity and position of the cyclist are 3.20 m/s and 7.30 m. For the time interval from 0 >= t <= 6....
*June 29, 2015 by Jake*

**Physics**

An electron's position is given by r = 2.00t i - 7.00t2 j + 5.00 k, with t in seconds and r in meters. (a) In unit-vector notation, what is the electron's velocity v(t)? (Answer in terms of i, j, k, and t.) (b) What is v in unit-vector notation at t = 2.00 s? Ive tried about ...
*September 13, 2009 by Ryan*

**Calc3**

A particle initially at the origin travels in uniform motion with velocity v=2i-j-2k. Find position venctor vector r(t) of a particle at time t. Find equatio for the plane passing through the origin and perp. to the tragectory of the particle. And find when and where the ...
*September 18, 2012 by Margo*

**Physics**

1. Consider the two vectors P and Q. The definition of P is P = i × (i × j). The definition of Q is Q = (i × i) × j . a. The magnitude of P is equal to the magnitude of Q. b. The magnitude of P is greater than the ...
*December 27, 2011 by Sarah*

**Physics**

A ball is thrown towards a vertical wall from a point 2m above the ground and 3m from the wall. the initial velocity of the ball is 20m/s at an angle of 30deg above the horizontal. if the collision of the ball with the ball is perfectly elastic. how far behind the thrower does...
*April 12, 2012 by ridhi*

**Physics..=> drwls - I need your help**

I need help seeing if my thoughts are correct and how to do some things. Block 1 of mass 0.200 kg is sliding to the right over a frictionless elevated surface at a speed of 8.00 m / s. The block undergoes an elastic collision with stationary block 2, which is attached to a ...
*February 26, 2008 by ~christina~*

**physics**

an overhead view of the path taken by a 0.162 kg cue ball as it bounces from a rail of a pool table. The ball's initial speed is 1.11 m/s, and the angle è1 is 64.7°. The bounce reverses the y component of the ball's velocity but does not alter the x component. What are (a) ...
*July 7, 2008 by farah*

**Physics**

A ball of mass 0.4 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 16 m/s at angle of 46◦ above the horizontal. The top of the fence is 4 m high. The ball hits ...
*October 18, 2011 by Jem*

**Mathematics - Trigonometric**

An electric motor turns at 2400 revolutions per minute or 2400 r/m. Find the angular velocity, in radians per second, in exact form and in approximate form, to the nearest hundredth. -------- This is what I've done so far and I don't know what to do next ... 2400 r/m divided ...
*November 5, 2007 by Anonymous*

**MATH please help with this ?**

math professor is thrown off the matthews bridges, height 240ft, by a disgruntled calculus class with an intitial upward velocity of 10ft/s a) assumign the acceleration dude to gravity is -32ft/s^2,find the macimum height of the professor. b) find the time before the professor...
*April 21, 2010 by joelle*

**11th grade**

A flowerpot falls from a window sill 38.8 m above the sidewalk. What is the velocity of the flowerpot when it strikes the ground? The acceleration of gravity is 9.81 m/s2 . Answer in units of m/s. How much time does a passerby on the side- walk below have to move out of the ...
*September 20, 2010 by Taylor*

**physics**

Blocks A, B, and C are placed as in the figure and connected by ropes of negligible mass. Both A and B weigh 27.5 each, and the coefficient of kinetic friction between each block and the surface is 0.40. Block C descends with constant velocity. Find the tension in the rope ...
*November 19, 2011 by Abdulla*

**physics**

a car of mass 1600kg,travelling at a speed of 30ms to the left,collides head-on with 0ms to the right,the two vehicles move together as a unit in a straight line after the collision.calculate the velocity of the two vehicles after collision.2.do the necessary calculation to ...
*February 15, 2012 by phethile dlamini*

**Math**

The Height of a ski jumper, 'h' in meters is given by the equation h=-4.9t^(2)+0.5vt+8 where 't' is measured in seconds after leaping from the ramp and 'v' is his/her speed at the time of the jump. a)If the jumpers' maximum height is reached is 16 m, determine the initial ...
*November 5, 2012 by May*

**Physics **

Vanessa can swim 3.0 m/s in still water. While trying to swim directly across a river from west to east, Vanessa is pulled by a current flowing southward at 2.0 m/s. A) What is the magnitude of Vanessa’s resultant velocity? B) If Vanessa wants to end up exactly across stream ...
*October 20, 2013 by Kailey*

**Physics **

Vanessa can swim 3.0 m/s in still water. While trying to swim directly across a river from west to east, Vanessa is pulled by a current flowing southward at 2.0 m/s. A) What is the magnitude of Vanessa’s resultant velocity? B) If Vanessa wants to end up exactly across stream ...
*October 20, 2013 by Kailey*

**Physics**

A boat is to be used to cross a river of width w that is flowing with a speed v. The boat travels with a constant speed 2v relative to water. At what angle should the boat be directed in order to arrive at a point directly across from its starting point? (draw a diagram ...
*October 6, 2014 by Need help*

**Physics **

Two students (90.0 kg and 60.0 kg) on roller skates face-to-face push against each other. The 90.0 kg student moves at 5.0 m/s just after their hands lose contact. I figured out part A (final velocity of 60.0 kg student) to be 7.5 m/s backward. I need help with part B. (b) ...
*December 24, 2014 by Jason *

**math-urgent**

A ball with a mass 0.15kg is thrown upward with an initial velocity 20m/s from the roof of a building 30m high. Neglect air resistance. Find the max height above the ground that the ball reaches. Assuming the ball misses the building find the time that it hits the ground
*June 21, 2015 by Anonymous*

**Physics**

Pa and Oz start walking at the same corner of a field whose south- west is bounded by a straight wall. Pa walks alongside the wall at 5.5 km/h while Oz sets off at 6 km/h along a straight foot path across the field which makes an angle of 50 degrees with the wall. Find the ...
*February 5, 2011 by Joseph*

**physics**

a 1500 kg car travelling at 16.7 m/s to the south collides with a 6300 kg truck that is initially at rest at a stop light. the car and the truck sticks togetherand moves together after the collision. what is the final velocity of the two-vehicle mass? answer in units of m/s.. ...
*May 30, 2011 by OMAR*

**Physics**

From t = 0 to t = 5.00 min, a man stands still, and from t = 5.00 min to t = 10.0 min, he walks briskly in a straight line at a constant speed of 2.3 m/s. (a) What is his average velocity vavg in the interval 2.000 min to 7.90 min? I found this to be 1.15 m/s (b) What is his ...
*September 5, 2011 by Natalie*

**physics**

A car engine accelerates at a constant rate from 170 rpm to 3050 rpm in 7 seconds. I have found that at t=0, the angular velocity (omega)=17.8 rad/s, the angular acceleration (alpha)= 43.1 rad/s^2, the tangential acceleration = 7.76 m/s^2, and the centripetal acceleration is ...
*April 27, 2009 by Elle*

**Physics**

Two people push on a crate. Person 1 pushes in the positive X direction with a force of 25N. The second person pushes in the negative X direction at an angle of 15 degrees below the horizontal with a magnitude of 18.5N the box moves with uniform velocity. What is the force of ...
*November 17, 2009 by Scott*

**physics**

The displacement vector for a 15.0 second interval of a jet airplane's flight is (3150, −2430) m. (a) What is the magnitude of the average velocity? (b) At what angle, measured from the positive x axis, did the airplane fly during this time interval? Express the angle as...
*December 20, 2010 by calantha*

**Physics**

Two cars crash into each other at an intersection on a very icy road. One 3,000 lb car is traveling 45 mph NW. The other, weighing 2,000 lb, is traveling 30 mph E. After the collision, their bumpers lock together. What is the velocity of the wreck as it slides off the road ?
*March 20, 2011 by P.*