Friday

April 18, 2014

April 18, 2014

Number of results: 31,282

**Physics**

The maximum speed of a 3.1-{\rm kg} mass attached to a spring is 0.70 m/s, and the maximum force exerted on the mass is 12 N. What is the amplitude of motion for this mass? Express your answer using two significant figures.
*Sunday, November 20, 2011 at 3:01pm by Byron*

**Phyics**

Sitting besides a friend on a park bench, you grab her hat and start running in a straight line away from her. Over the first 15.0, you accelerate at 1 m/s^2 up to your maximum running speed. You then continue at your maximum running speed for 15 s more before your friend ...
*Monday, November 18, 2013 at 3:23pm by Brandon*

**Physics**

Sitting besides a friend on a park bench, you grab her hat and start running in a straight line away from her. Over the first 15.0, you accelerate at 1 m/s^2 up to your maximum running speed. You then continue at your maximum running speed for 15 s more before your friend ...
*Monday, November 18, 2013 at 3:23pm by Brandon*

**Physics**

An object is thrown vertically upward such that it has a speed of 32 m/s when it reaches two thirds of its maximum height above the launch point. Find the maximum height h. The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m
*Sunday, February 3, 2013 at 12:19am by Preston*

**physics**

Orange light with a wavelength of 6.00x102nm is directed at a metallic surface with a work function of 1.60eV. Calculate: a) The maximum kinetic energy of the emitted electrons b) Their maximum speed c) The cutoff potential necessary to stop these electrons (V=Ek/e)
*Thursday, June 6, 2013 at 12:25am by Anonymous*

**Physics**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.20x10^4 rad/s to an angular speed of 3.14x10^4 rad/s. In the process, the bit turns through 1.92x10^4 rad. Assuming a constant angular acceleration, how long would it take the bit to reach ...
*Tuesday, October 23, 2012 at 8:38am by Sam*

**physics **

A negative acceleration is sometimes called a deceleration. What is the acceleration of a water rocket launched at 25m/s if it reaches its maximum height at 2.5s? (Note its speed at maximum height is zero!)
*Monday, February 25, 2013 at 11:57am by Kirsty Williams*

**Physics**

Derive a formula for the maximum speed v of a simple pendulum bob in terms of g, the length L, and the maximum angle of swing theta. I don't know how to go about this, I thought to use T = 2pi*sqr(L/g) and since F=MA, I divide A by time and . . . but I know this is completely ...
*Monday, April 21, 2008 at 6:15pm by Oscillations*

**math**

When an F14 fighter jet takes off, its wings are 110 degrees from the line of flight. To reach its maximum speed, the wings pull to a back position that cretes an angle from the line of flight that is 22 degrees less than a straight angle. Moving at 0.5 degrees per second, how...
*Tuesday, March 11, 2014 at 7:01am by Viking*

**Physics**

A 0.097 kg cup falls from the kitchen shelf and shatters on the ceramic tile floor. Assume that the maximum kinetic energy obtained by the cup is 2.6 J and that air resistance is negligible. Calculate the cup's maximum speed
*Saturday, April 9, 2011 at 4:45am by Simran*

**physics**

The launching speed of a certain projectile is 3.0 times the speed it has at its maximum height. Calculate the elevation angle at launching
*Friday, February 8, 2013 at 8:43am by julia*

**Physics**

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Thursday, November 14, 2013 at 8:45pm by Vinny*

**Physics**

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Thursday, November 14, 2013 at 8:45pm by Vinny*

**Physics**

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Thursday, November 14, 2013 at 8:54pm by Vinny*

**Physics- Mechanics**

Before throwing a 0.821 kg discus, an athlete rotates it along a circular path of radius 1.19 m. The maximum speed of the discus is 18.7 m/s. Determine the magnitude of its maximum radial acceleration. Answer in units of m/s2.
*Friday, September 17, 2010 at 5:28pm by Genevieve*

**Physics please help!!**

The launching speed of a certain projectile is 9.0 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Sunday, February 3, 2013 at 12:42pm by Julia *

**Physics**

Suppose that one oscillation of a swinging lamp takes 5.5s. What maximum speed does the lamp have if its maximum angle from vertical is 3.0degrees? I first found L to be 7.51m. That was right. Now, I calculated the angular frequency of the pendulum to be 1.14. I'm pretty sure ...
*Thursday, November 13, 2008 at 10:31pm by Samantha*

**physics**

A block of mass m=.75kg is fastened to an unstrained horizontal springwhose spring constant is 82 N/m. The block is given a displacement of +.12m, where + sign indicates that the displacement is along the +x axis, and then released from rest. Find the angular frequency w of ...
*Tuesday, February 19, 2008 at 1:05pm by Anonymous*

**Physics**

A person swings a 0.33 kg tether ball tied to a 5.4 m rope in an approximately horizontal circle. (a) If the maximum tension the rope can withstand before breaking is 11 N, what is the maximum angular speed of the ball?
*Sunday, March 7, 2010 at 7:01pm by John*

**physics**

if the maximum safe breaking acceleration of a navy fighter is 15m/s^2 and an aircraft carrier's deck is 100m long, with what maximum speed can a fighter safely land on the deck and still stop completely on the ship?
*Sunday, March 27, 2011 at 6:45pm by mike*

**Physics**

The position of a body moving in simple harmonic motion is given by m t x ï£· ï£¸ ï£¶ ï£¬ ï£ ï£« + = 4 9 cos 3 Ï€ . For this motion, what are the (a) amplitude, period, phase constant, frequency, and angular frequency? Determine the bodyâ€™s (b) maximum speed and maximum ...
*Sunday, December 18, 2011 at 8:43am by Dia*

**physics**

An elavater m=800kg has a maximum load of 8 people of 600kg. The elevatorgoes up to 10 stories = 30m at a costant speed of 4m/s. what is the average power output of the elevater motor if the elevater is fully loaded with its maximum weight? (neglect friction)
*Thursday, July 14, 2011 at 9:19pm by Noemi*

**physics**

A daredevil leaves the end of a ramp with a speed of 32.0 m/s if his speed is 29.8 m/s when he reaches the peak of the path, what is the maximum height that he reaches? how do i do thiss?
*Saturday, October 23, 2010 at 3:45pm by Maddy*

**physics**

A daredevil leaves the end of a ramp with a speed of 32.0 m/s if his speed is 29.8 m/s when he reaches the peak of the path, what is the maximum height that he reaches? how do i do thiss?
*Saturday, October 23, 2010 at 3:45pm by Maddy*

**physics**

A mass m is attached to the end of a spring (constant k). The mass is given an initial displacement x0 from equilibrium, and an initial speed v0. Ignoring friction and the mass of the spring, use energy methods to find the following in terms of the given quantities. (Use x_0 ...
*Sunday, November 7, 2010 at 5:08pm by Lily*

**physics**

A mass M of 2.95 kg is attached to the end of a string whose length is 0.420 m. The mass slides without friction on a horizontal surface as indicated in the diagram. If the string can withstand a maximum tension of 127.5 N, what is the maximum tangential speed the ball can ...
*Wednesday, October 16, 2013 at 8:48pm by Anonymous*

**PHYSICS **

A car is safely negotiating an unbanked circular turn at a speed of 29 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one-ninth of its dry-road value. If ...
*Tuesday, October 2, 2012 at 9:18pm by Lindsay*

**physical science**

a yo-yo is swung in a vertical circle in such a way that its total energy KE and PE is constant. At what point in the circle is this speed maximum? A minumum? why? (b) if the yo-yo has a speed of 3 m/s at the top of the circl, whose radius is 80 cm, what is tis speed at the ...
*Wednesday, September 19, 2012 at 4:50pm by tracey*

**Physics ( Calculus & Mecahnics ) **

A proton with mass m moves in one dimension.The potential-energy function is where and are positive constants. The proton is released from rest a x0 = a/b. (a) Show that can be written as U(x) = a --- [ ( x0/x )^2 - x0/x ] x0^2 Graph U(x). Calculate U(x0) and thereby locate ...
*Sunday, January 23, 2011 at 10:26pm by Clark*

**Physics**

1) The initial speed is V = sqrt(18^2 + 18^2) 2) µ = arctan(1.0) = 45º 3) The maximum height reached derives from h = V^2(sin^2(µ))/2g. 4) The distance traveled by the ball derives from d = V^2(sin(2µ))/g. 5) From Vf = Vo + gt, the time to reach the maximum height derives from...
*Thursday, September 29, 2011 at 12:04am by tchrwill*

**physics**

Surely you can do (a) yourself. For (b), consider if the average speed could ever exceed the maximum speed, and in what situation they could be the same. For (c), the average speed during acceleration is Vmax/2 and the total distance travelled is (Vmax/2)*4.86 s + Vmax*5.00 s...
*Monday, September 24, 2007 at 7:05pm by drwls*

**physics**

In the absence of air resistance two balls are thrown upward from the same launch point. Ball A rises to a maximum height above the launch point that is four times greater than that of ball B. The launch speed of ball A is _______ times greater than that of ball B. a)2 b)4 c)8...
*Wednesday, September 8, 2010 at 11:00am by Brantley*

**Physics**

Can someone help me find Delta Time for the first 150 meters of this question. Everytime I try and get it by using the quadratic formula I get two negative numbers which I don't think is right. A model rocket is launched straight upward with an initial speed of 50.0m/s. It ...
*Friday, September 28, 2007 at 3:43pm by Dustin*

**phy**

A blue ball is thrown upward with an initial speed of 20.6 m/s, from a height of 0.8 meters above the ground. 2.5 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.2 m/s from a height of 23.7 meters above the ground. The force of ...
*Tuesday, September 13, 2011 at 12:22am by a*

**Physics**

At the beginning of a roller coaster ride, the car is lifted to the top of a large hill and released. The speed of the car at the top of the hill is small, so we will assume it to be zero. The car rolls freely down this hill and reaches its maximum speed at the bottom. If the ...
*Tuesday, December 3, 2013 at 10:36pm by Angie Need Help ASAP*

**Physics**

A 0.77 kg mass, attached to the end of a 0.86 m string, is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 683 N, then what maximum speed can the mass have if the string is not to break?
*Friday, December 17, 2010 at 8:01pm by Cassaundra*

**Physics**

A driver approaches an intersection at a speed of 50km/h, when the light turns amber. The driver applies brakes to get the maximum stopping force without skidding. The car has a mass of 1500kg and the force of static friction between the tires and the road is 1.1*10^4N. ...
*Monday, November 12, 2012 at 5:30pm by ashley*

**Physics**

Light-rail passenger trains that provide transportation within and between cities are capable of modest accelerations. The magnitude of the maximum acceleration is typically 1.3 m/s ^2, but the driver will usually maintain a constant acceleration that is less than the maximum...
*Monday, February 4, 2013 at 8:34pm by Aubree*

**Physics**

The launching speed of a certain projectile is 6.4 times the speed it has at its maximum height. Calculate the elevation angle at launching. I have noo idea how to start this one. Please help!
*Wednesday, November 7, 2007 at 9:09pm by Lindsay*

**physics**

A 60 kg skydiver moving at terminal speed falls 50 m in 1 sec. What power is the skydiver expending on the air? The terminal speed of the falling object is the maximum constant speed the object will reach due to the opposing force of air resistance.
*Thursday, November 3, 2011 at 10:55am by pakilina*

**Physics **

The maximum height is where V = 0. The acceleration rate is -g, in either direction. The initial speed is the same as the final speed (because of conservation of energy.) The time it takes to decelerate from initial speed V to 0 is V/g. The time it takes to accelerate from 0 ...
*Sunday, January 24, 2010 at 2:34pm by drwls*

**Physics**

An astronaut on the planet Vimrom IV finds that she can jump a maximum horizontal distance of 12.00 m if her initial speed is 4.90 m/s. What is the acceleration due to gravity on this planet? In the previous problem, what is the maximum height about the ground reached by the ...
*Sunday, March 2, 2014 at 2:59pm by Yera*

**physics**

The maximum static frioction force is the weight of the car (M g) multiplied by the static friction coefficient (0.7). Set that equal to the centripetal force (M V^2/R) to solve for the maximum speed. The car's mass M will cancel out
*Monday, October 29, 2007 at 3:11pm by drwls*

**Physics**

At the beginning of a roller coaster ride, the car is lifted to the top of a large hill and released. The speed of the car at the top of the hill is small, so we will assume it to be zero. The car rolls freely down this hill and reaches its maximum speed at the bottom. If the ...
*Wednesday, December 4, 2013 at 3:42pm by Angie Need Help ASAP*

**physics**

A 1.20 kg mass on a horizontal spring oscillates on a frictionless surface with a displacement as a function of time given by x(t) = 0.075cos(4.16t – 2.45). (Units are standard units.) a.) Find the time for one complete vibration. b.) Find the force constant of the spring. c...
*Tuesday, July 31, 2012 at 6:03pm by Lauren*

**physics**

Derive a formula for the maximum speed vmax of a simple pendulum bob in terms of g, the length ℓ, and the maximum angle of swing θmax. Express your answer in terms of the variables g, l, and θmax.
*Sunday, October 6, 2013 at 3:15am by Anonymous*

**phyics**

When responding to sound, the human eardrum vibrates about its equilibrium position. Suppose an eardrum is vibrating with an amplitude of 5.0 x10-7 m and a maximum speed of 3.3 x10-3 m/s. (a) What is the frequency (in Hz) of the eardrum's vibrations? (b) What is the maximum ...
*Tuesday, November 12, 2013 at 11:02am by Joey*

**Physics**

At the beginning of a roller coaster ride, the car is lifted to the top of a large hill and released. The speed of the car at the top of the hill is small, so we will assume it to be zero. The car rolls freely down this hill and reaches its maximum speed at the bottom. If the ...
*Wednesday, December 4, 2013 at 10:00pm by Angie Need Help ASAP NOW*

**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)
*Tuesday, November 16, 2010 at 9:21pm by Jess*

**Physics**

Initial kinetic energy = (1/2)kX^2 = 120*0.12^2 = 1.728 J Set that equal to the maximum kinetic energy, and solve for Vmax. (1/2)MVmax^2 = 1.728 J Maximum speed is attained when the spring is unstressed (equilibrium position).
*Tuesday, March 13, 2012 at 11:17pm by drwls*

**physics**

A person swings a 0.33 kg tether ball tied to a 5.4 m rope in an approximately horizontal circle. (a) If the maximum tension the rope can withstand before breaking is 11 N, what is the maximum angular speed of the ball? --I figured out the rest of the problem and i just need ...
*Saturday, March 6, 2010 at 9:07pm by John*

**physics**

You throw a baseball directly upward at time t = 0 at an initial speed of 12.5 m/s. What is the maximum height the ball reaches above where it leaves your hand? At what times does the ball pass through half the maximum height? Ignore air resistance and take g = 9.80 m/s2.
*Sunday, September 8, 2013 at 5:11pm by chris*

**Physics**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.20 104 rad/s to an angular speed of 3.14 104 rad/s. In the process, the bit turns through 1.92 104 rad. Assuming a constant angular acceleration, how long would it take the bit to reach its...
*Monday, October 22, 2012 at 1:34pm by Sam*

**physics**

Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle θ. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tires and the road is...
*Thursday, February 28, 2013 at 2:27pm by Dee*

**Physics**

Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle θ. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tires and the road is...
*Monday, March 4, 2013 at 7:05pm by Dee*

**physics**

A daredevil on a motorcycle leaves the end of a ramp with a speed of 29.0 m/s as in the figure below. If his speed is 26.7 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
*Saturday, October 4, 2008 at 5:52pm by Sandhya*

**Physics**

A daredevil on a motorcycle leaves the end of a ramp with a speed of 33.0 m/s as in the figure below. If his speed is 31.3 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
*Wednesday, October 13, 2010 at 1:57am by Abdullah*

**physics**

A daredevil on a motorcycle leaves the end of a ramp with a speed of 29.5 m/s as in the figure below. If his speed is 27.1 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
*Wednesday, March 9, 2011 at 4:20pm by Allie*

**Physics**

A 0.40-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3 m on a frictionless surface. If the cord will break when the tension in it exceeds 60 N, what is the maximum speed the ball can have? How would your answer be affected if there were ...
*Friday, December 24, 2010 at 11:32pm by Matt*

**physics**

The maximum speed of a 3.7-{\rm kg} mass attached to a spring is 0.66 m/s, and the maximum force exerted on the mass is 11 N. What is the amplitude of motion for this mass? What is the force constant of the spring? What is the frequency of this system?
*Sunday, November 20, 2011 at 8:43pm by shaz*

**Physics**

A 2.15 kg disc is attached to the end of a string whose length is 0.410 m. The disc slides without friction on a horizontal surface. If the string can withstand a maximum tension of 131.1 N, what is the maximum tangential speed the disc can have before the cord breaks?
*Thursday, October 6, 2011 at 12:29pm by Reven*

**physics**

1. A basketball player passes the ball to his teammate at an angle of 40degrees above the horizontal. The ball is released 1.5m above the floor at a speed of 5m/s. Find: a) the maximum height reached by the ball from the floor b) the horizontal required to reach the maximum ...
*Wednesday, December 7, 2011 at 12:33pm by bella*

**phy 111**

A daredevil on a motorcycle leaves the end of a ramp with a speed of 34.5 m/s as in the figure below. If his speed is 32.1 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
*Thursday, October 14, 2010 at 4:30pm by blake *

**Physics**

A runner travels 100 m in 10.9 s. Assume that it takes him 1.35 s to reach his top speed, which is then maintained for the rest of the race. Find the following values: a) acceleration during the first 1.35 s b) maximum speed
*Thursday, May 26, 2011 at 11:59am by Katie*

**Physics: urgent help needed**

i have a test on monday 1 A beach ball is thrown straight up with a speed of 10m/s from a point 2 m above the ground a) Assuming no air reistance, calculate how far up the ball will go b)At what speed will the ball eventually hit the ground? c) If the air resistance exerts a ...
*Saturday, April 9, 2011 at 9:08pm by deepti*

**physics**

A professional golfer can hit a ball with a speed of 70 m/s. What is the maximum distance a golf ball hit with this speed could travel on Mars, where the value of g is 3.71 m/s^2?
*Wednesday, September 18, 2013 at 12:01am by Anonymous*

**NWFSC**

A 277 oscillator has a speed of 122 when its displacement is 2.90 and 47.5 when its displacement is 6.80. What is the oscillator's maximum speed?
*Sunday, January 16, 2011 at 9:31pm by Tony Hart*

**Physics**

A small rocket is launched vertically, attaining a maximum speed at burnout of 1.0 102 m/s and thereafter coasting straight up to a maximum altitude of 1482 m. Assuming the rocket accelerated uniformly while the engine was on, how long did it fire and how high was it at engine...
*Thursday, October 7, 2010 at 11:01pm by Preetha*

**physics**

A ball is thrown straight downward from the surface of the moon. Is the maximum height it reaches less than, equal to, or greater than the maximum height reached by a ball thrown upwards on the earth with the same initial speed? Ignore air resistance in both cases
*Sunday, September 23, 2012 at 6:49pm by tiffany*

**PHYSICS**

An athlete on a trampoline leaps straight up into the air with an initial speed of 9.3 m/s. Find the following: (b) the speed of the athlete when she is halfway up to her maximum height
*Wednesday, October 27, 2010 at 5:12pm by Petrik*

**physics**

A certain truck can slow at a maximum rate of 4.6 m/s2 in an emergency. When traveling in this truck at a constant speed of 19 m/s the driver spots a large hole in the road 48.2 m in from of his position. The truck continues moving forward at a constant speed until the driver ...
*Sunday, September 22, 2013 at 10:57pm by lanaaaaaa*

**calculus**

The cost of running a ship at a constant speed of v km/h is 160 + 1/100*v^3 dollars per hour. a)Find the cost of a journey of 1000km at a speed of v km/h. b)Find the most economical speed for the journey, and the minimum cost. c)If the ship were to have maximum speed of 16 km/...
*Sunday, November 17, 2013 at 8:37am by jim_segs*

**college physic**

A 1.25kg mass stretches a vertical spring 0.215m.If the spring is stretches an additional 0.130m and released, (a)how long does it take to reach the equilibrium position again? (b)Write an equation giving its position y as a function of time t. (c)What will be its maximum ...
*Tuesday, July 26, 2011 at 10:47am by noah*

**Physics**

The pistons in an internal combustion engine undergo a motion that is approximately simple harmonic. If the amplitude of motion is 3.8cm , and the engine runs at 1500rpm , find the maximum acceleration of the pistons. Find their maximum speed.
*Wednesday, December 1, 2010 at 5:02am by Phy help!*

**Physics**

Find the speed, v, of a pendulum at the bottom of its swing (B), given that it has mass m and initial height at A is h (the difference in height from B to A). Your answer will be in terms of g as well. Included is a drawing of a pendulum at its maximum height (A), and at its ...
*Thursday, December 27, 2012 at 8:14pm by Dan*

**Physics AP**

A ball is thrown straight upward with a speed of +12 m/s. A) what's the ball's acceleration just after it is thrown? B) how much time does it take for the ball to rise to its maximum height? C) what's the approximate maximum height the ball reaches?
*Saturday, September 15, 2012 at 9:15pm by Anna*

**Physics**

In an electric shaver, the blade moves back and forth over a distance of 2.2 mm in simple harmonic motion, with frequency 116 Hz. Find (a) the amplitude (in mm), (b) the maximum blade speed, and (c) the magnitude of the maximum blade acceleration. I got that (a) is 1.1 mm, but...
*Monday, December 5, 2011 at 4:00pm by Lisa*

**Physics(Please help)**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.44 x 104 rad/s to an angular speed of 5.05 x 104 rad/s. In the process, the bit turns through 1.77 x 104 rad. Assuming a constant angular acceleration, how long would it take the bit to ...
*Thursday, June 7, 2012 at 4:57pm by Hannah*

**Physics**

A rope can withstand a maximum tension of 75 N before snapping . What maximum speed can you spin a 6.0 kg rock in a vertical circle of radius 1.5 m without breaking the rope? My answer: At the bottom of the spin: Fnet=ma Ft-Fg=m(v^2/r) 75-58.8=6(v^2/1.5) v=2.01m/s Is this ...
*Friday, November 19, 2010 at 7:35pm by Dwight*

**college physic SHM**

A 1.25kg mass stretches a vertical spring 0.215m.If the spring is stretches an additional 0.130m and released, (a)how long does it take to reach the equilibrium position again? (b)Write an equation giving its position y as a function of time t. (c)What will be its maximum ...
*Tuesday, July 26, 2011 at 11:22pm by noah*

**Physics**

Maximum acceleration is w^2 A, where A is the amplitude, and w is the angular frequency of motion, 2 pi f. The maximum velocity is wA. Note that the ratio of maximum acceleration to maximum velocity, both of which you know, equals w. Compute w and use the relation w = sqrt(k/m...
*Friday, December 4, 2009 at 3:41pm by drwls*

**AP Physics**

A pole-vaulter approaches the takeoff point at a speed of 9.50 m/s. Assuming that only this speed determines the height to which he can rise, find the maximum height at which the vaulter can clear the bar.
*Saturday, November 13, 2010 at 9:37am by Greg*

**Physics**

A object-spring system oscillates with an amplitude of 4.0 cm. If the spring constant is 210 N/m and object has a mass of 0.50 kg, determine each of the following values. (a) the mechanical energy of the system (b) the maximum speed of the object (c) the maximum acceleration ...
*Monday, December 6, 2010 at 11:11am by Anonymous*

**physics**

a ball is thrown at an initial angle of 37 and initail velocity of 23.0 m/s reaches a maximum height h, as shwon in the Figure. With what initial speed must a ball be thrown straight up to reach the same maximum height h?
*Monday, January 3, 2011 at 3:10pm by Anonymous*

**physics**

A sinusoidal transverse wave of amplitude ym = 3.2 cm and wavelength = 3.4 cm travels on a stretched cord. Find the ratio of the maximum particle speed (the speed with which a single particle in the cord moves transverse to the wave) to the wave speed.
*Friday, December 24, 2010 at 10:37am by Bashr*

**physics**

A sinusoidal transverse wave of amplitude ym = 6.4 cm and wavelength = 5.2 cm travels on a stretched cord. Find the ratio of the maximum particle speed (the speed with which a single particle in the cord moves transverse to the wave) to the wave speed.
*Sunday, December 26, 2010 at 2:31pm by john*

**physics**

Total energy (which is conserved) = (1/2)M*V^2 + (1/2)k X^2 = 1.5*0.55^2 + 150*0.02^2 = 0.5138 J (a) when V = 0 you get the maximum deflection Xmax. That is the amplitude. 0.5138 = (300/2)*Xmax^2 Xmax = 0.0585 m (b) when X = 0 you have maximum speed: 0.5138 = 1.5*Vmax^2 Vmax...
*Wednesday, March 7, 2012 at 11:47pm by drwls*

**Mechanics**

A 1000-kg car whose motor delivers a maximum power of 40.0 hp to its wheel can maintain a steady speed of 130 km/h on a horizontal roadway. How large is the friction force that impedes its motion at this speed? Show the solution and answer
*Sunday, September 15, 2013 at 12:37am by Jason*

**physics**

Why is it impossible for a skier to reach maximum speed that is physically possible by converting the change in height to speed? what is this question asking? Some of the potential energy available is lost due to friction. Friction on the skis, friction on the air.
*Thursday, May 31, 2007 at 10:09pm by Sam*

**Physics**

A object-spring system oscillates with an amplitude of 4.0 cm. If the spring constant is 210 N/m and object has a mass of 0.50 kg, determine each of the following values. (a) the mechanical energy of the system J (b) the maximum speed of the object m/s (c) the maximum ...
*Sunday, December 5, 2010 at 1:32pm by Josh*

**Physics **

Car A uses tires for which the coefficient of static friction is 0.357 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 27.7 m/s. Car B uses tires for which the coefficient of static friction is 0.737 on the same curve. What is the...
*Thursday, June 27, 2013 at 5:53pm by Justin S.*

**Physics help.**

First compute the "perfect bank" angle at the 72.4 km/h speed. Then require that the centripetal force at the higher speed be provided by the maximum friction force compatible with the static friction coefficient.
*Monday, March 5, 2012 at 6:55pm by drwls*

**physics**

Olympic champion Justin gaitlin set a new world record for 100.0 m sprint at the last lympics by clocking 9.86 s for the race.Calculate a)His average speed for the race b)Assuming that he accelerated uniformly for the first 4.86 s after taking off the blocks to reach a maximum...
*Monday, September 24, 2007 at 7:05pm by JohnX*

**physics**

Olympic champion Justin gaitlin set a new world record for 100.0 m sprint at the last lympics by clocking 9.86 s for the race.Calculate a)His average speed for the race b)Assuming that he accelerated uniformly for the first 4.86 s after taking off the blocks to reach a maximum...
*Monday, September 24, 2007 at 8:05pm by Sam*

**physics**

A 2000 kg car negotiates a curve of radius 40.0m on a level road. The static friction coefficient between the tires and the pavement is 0.7. Calculate the maximum force of static friction for the car and the maximum speed with which it will be able to negotiate the curve.
*Monday, October 29, 2007 at 3:11pm by johnny*

**Physics**

My question had 2 parts: a) A 2.0 kg object oscillates with simple harmonic motion on a spring of force constant 580.0 N/m. The maximum speed is 1.0 m/s. What is the total energy of the object and the spring? Answer: 1.0 J b) What is the maximum amplitude of the oscillation? ...
*Wednesday, April 30, 2008 at 4:55pm by Lindsay*

**physics**

A stone is thrown vertically upward. On its way up it passes point A with speed v, and point B, 6.2 m higher than A, with speed v/2. Calculate the maximum height reached by the stone above point B.
*Sunday, December 5, 2010 at 3:34pm by anna*

**physics**

In an electric shaver, the blade moves back and forth over a distance of 2.0 mm. The motion is simple harmonic, with frequency 118 Hz. (a) Find the amplitude. mm (b) Find the maximum blade speed. m/s (c) Find the magnitude of the maximum blade acceleration. m/s2
*Monday, December 8, 2008 at 9:08pm by johnny*

**physics**

In an electric shaver, the blade moves back and forth over a distance of 2.0 mm. The motion is simple harmonic, with frequency 118 Hz. (a) Find the amplitude. mm (b) Find the maximum blade speed. m/s (c) Find the magnitude of the maximum blade acceleration. m/s2
*Thursday, December 11, 2008 at 8:08pm by johnny*

**Physics**

A particle executes simple harmonic motion with an amplitude of 9.00 cm. At what positions does its speed equal two thirds of its maximum speed? I got: v2 +ω^2x^2 =ω^2A^2 vmax =ω A and v = ωA/2?
*Monday, January 4, 2010 at 11:41pm by Zoe*

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