Thursday

May 28, 2015

May 28, 2015

Number of results: 27,727

**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.
*November 20, 2011 by Byron*

**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 ...
*November 7, 2010 by Lily*

**Math**

Suppose the speedometer of your car reads 90 km/ hr. If you are driving in the united states where the maximum speed is posted as 50 mi/ hr By how much are you exceeding the speed limit.
*April 14, 2015 by Jen*

**Physics**

A projectile is launched from the earth’s surface at initial speed v0 at angle θ0 with the horizontal. When the projectile is at its maximum height h, it has half the speed it had when it was at half its maximum height (h/2). At what angle was the projectile launched?
*September 13, 2014 by M*

**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 ...
*April 21, 2008 by Oscillations*

**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
*February 3, 2013 by Preston*

**physics**

a typical automobile has a maximum deceleration of about 7m/s2, the typical reaction time to engage the brakes is 0.50s. A school board sets the speed limit in a school zone to meet the condition that all cars should be able to stop in a distance of 4 m. a) what maximum speed ...
*September 12, 2012 by amanda and leah*

**physics**

Atoms in a solid are not stationary, but vibrate about their equilibrium positions. Typically, the frequency of vibration is about f = 4.55 x 1012 Hz, and the amplitude is about 2.69 x 10-11 m. For a typical atom, what is its (a) maximum speed and (b) maximum acceleration?
*November 30, 2014 by Nick*

**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 ...
*December 3, 2013 by Angie Need Help ASAP*

**Math**

Suppose the speedometer of your car reads 90km/hr. If you are driving in the United States where the maximum speed is posted as 50 mi/hr by how much are you exceeding the speed limit.
*April 13, 2015 by Sharon*

**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)
*July 14, 2011 by Noemi*

**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)
*June 6, 2013 by Anonymous*

**Physics**

Two blocks, each with a mass = 0.168 kg, can slide without friction on a horizontal surface. Initially, block 1 is in motion with a speed = 1.28 m/s; block 2 is at rest. When block 1 collides with block 2, a spring bumper on block 1 is compressed. Maximum compression of the ...
*March 5, 2012 by Lilly *

**physics**

Two blocks, each with a mass m = 0.400 kg, can slide without friction on a horizontal surface. Initially, block 1 is in motion with a speed $v$ = 1.20 m/s; block 2 is at rest. When block 1 collides with block 2, a spring bumper on block 1 is compressed. Maximum compression of ...
*March 5, 2014 by Ted*

**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 ...
*December 4, 2013 by Angie Need Help ASAP*

**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 ...
*December 4, 2013 by Angie Need Help ASAP NOW*

**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!)
*February 25, 2013 by Kirsty Williams*

**Physics 4a**

A stone is thrown vertically upward. On its way up it passes point A with speed v, and point B, 7.85 m higher than A, with speed v. Calculate (a) the speed v and (b) the maximum height reached by the stone above point B.
*September 10, 2010 by Antonio*

**physics**

A stone is thrown vertically upward. On its way up it passes point A with speed v, and point B, 7.85 m higher than A, with speed v/2. Calculate (a) the speed v and (b) the maximum height reached by the stone above point B.
*September 10, 2010 by Antonio*

**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
*April 9, 2011 by Simran*

**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?
*March 7, 2010 by John*

**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 ...
*November 13, 2008 by Samantha*

**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 ...
*October 16, 2013 by Anonymous*

**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 ...
*February 19, 2008 by Anonymous*

**Physics**

Analyzing Roller Coaster Performance Using Conservation of Mechanical Energy 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 ...
*November 30, 2013 by Angie*

**Physics**

This speed is the maximum possible speed attained by the roller coaster, or the “theoretical speed”. Roller coasters are carefully designed to minimize frictional forces so that they approach these theoretical speeds. The efficiency of a roller coaster design can be found by ...
*December 3, 2013 by Angie Need Help ASAP*

**Physics**

This speed is the maximum possible speed attained by the roller coaster, or the “theoretical speed”. Roller coasters are carefully designed to minimize frictional forces so that they approach these theoretical speeds. The efficiency of a roller coaster design can be found by ...
*December 4, 2013 by Angie Need Help ASAP*

**Physics**

This speed is the maximum possible speed attained by the roller coaster, or the “theoretical speed”. Roller coasters are carefully designed to minimize frictional forces so that they approach these theoretical speeds. The efficiency of a roller coaster design can be found by ...
*December 4, 2013 by Angie Need Help ASAP NOW*

**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 ...
*November 19, 2010 by Dwight*

**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 ...
*December 18, 2011 by Dia*

**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 ...
*March 2, 2014 by Yera*

**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...
*March 11, 2014 by Viking*

**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 ...
*September 28, 2007 by Dustin*

**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...
*December 5, 2011 by Lisa*

**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. ...
*November 12, 2012 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...
*February 4, 2013 by Aubree*

**physics**

A particle with a mass of 3.00 10-20 kg is oscillating with simple harmonic motion with a period of 7.00 10-5 s and a maximum speed of 4.50 103 m/s. (a) Calculate the angular frequency of the particle. rad/s (b) Calculate the maximum displacement of the particle. m
*November 19, 2012 by Pipsy*

**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
*May 26, 2011 by Katie*

**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?
*December 17, 2010 by Cassaundra*

**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 ...
*October 23, 2012 by Sam*

**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 ...
*October 2, 2012 by Lindsay*

**Physics**

A car is safely negotiating an unbanked circular turn at a speed of 18 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 ...
*September 25, 2014 by Anon*

**physics**

. A car is safely negotiating an unbanked circular turn at a speed of 19 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 third of its dry-road value. If ...
*October 22, 2014 by vik*

**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
*February 8, 2013 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.
*November 14, 2013 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.
*November 14, 2013 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.
*November 14, 2013 by Vinny*

**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?
*October 23, 2010 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?
*October 23, 2010 by Maddy*

**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.
*February 3, 2013 by Julia *

**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 ...
*March 6, 2010 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.
*September 8, 2013 by chris*

**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 ...
*April 9, 2011 by deepti*

**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...
*September 8, 2010 by Brantley*

**Physics**

A Chinook Salmon has a maximum underwater speed of 3.58 m/s, but it can jump out of water with a speed of 6.68 m/s. to move upstream past a waterfall, the salmon does not need to jump to the top of the fall, but only to a point in the fall where the water speed is less than 3....
*September 24, 2006 by JIll*

**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
*October 27, 2010 by Petrik*

**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...
*February 28, 2013 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...
*March 4, 2013 by Dee*

**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 ...
*November 12, 2013 by Joey*

**physics**

When responding to sound, the human eardrum vibrates about its equilibrium position. Suppose an eardrum is vibrating with an amplitude of 6.7 x10-7 m and a maximum speed of 3.9 x10-3 m/s. (a) What is the frequency (in Hz) of the eardrum's vibrations? (b) What is the maximum ...
*April 15, 2015 by Anonymous*

**Physics**

You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.5 m above the ground, and it is moving at a speed of 8.0 m/s. (a) How much time does it take for the tennis ball to reach its maximum height? (b) What is the maximum height above ...
*September 6, 2014 by John*

**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...
*July 31, 2012 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.
*October 6, 2013 by Anonymous*

**Physics**

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

**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?
*October 6, 2011 by Reven*

**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!
*November 7, 2007 by Lindsay*

**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 ...
*September 13, 2011 by a*

**PHYSICS HELP!!**

A motorised gearbox has a reduction ratio of 50:1. The power input to the gearbox is 5 kW at 1440 RPM. The gearbox efficiency is 85% under maximum load conditions. The output shaft of the gearbox is attached to a winch drum of pitch diameter 220 mm and is used to hoist a load...
*May 12, 2015 by baz*

**PHYSICS HELP!!**

A motorised gearbox has a reduction ratio of 50:1. The power input to the gearbox is 5 kW at 1440 RPM. The gearbox efficiency is 85% under maximum load conditions. The output shaft of the gearbox is attached to a winch drum of pitch diameter 220 mm and is used to hoist a load...
*May 11, 2015 by baz*

**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.
*November 3, 2011 by pakilina*

**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 ...
*December 24, 2010 by Matt*

**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
*December 8, 2008 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
*December 11, 2008 by johnny*

**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.
*October 4, 2008 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.
*October 13, 2010 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.
*March 9, 2011 by Allie*

**simple harmonic motion**

A 50-g mass is attached to a spring and undergoes simple harmonic motion. Its maximum acceleration is 15m/s2 and its maximum speed is 3.5m/s .
*December 4, 2014 by little wayne*

**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/...
*November 17, 2013 by jim_segs*

**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...
*October 7, 2010 by Preetha*

**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
*September 15, 2013 by Jason*

**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 ...
*December 7, 2011 by bella*

**Caluclus**

Find the absolute maximum and absolute minimum of f on the interval (-1,2]: f(x)=(-x^3+x^2+3x+1)/(x+1) A. Maximum: (1, -2); Minimum: (-1, 2) B. Maximum: (1, -2); Minimum: None C. Maximum: None; Minimum: None D. Maximum: None; Minimum: (-1, 2) E. None of these I got to my ...
*January 11, 2015 by Anonymous*

**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.
*October 14, 2010 by blake *

**Physics**

A hunter wishes to cross a river that is 1.6 km wide and that flows with a speed of 4.8 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.6 km/h with respect to the water. What is the minimum time necessary for crossing?
*January 19, 2012 by Emily*

**physics**

A hunter wishes to cross a river that is 2.5 km wide and that flows with a speed of 6.0 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.8 km/h with respect to the water. What is the minimum time necessary for crossing?
*December 13, 2012 by Anonymous*

**physics **

A hunter wishes to cross a river that is 2.0 km wide and that flows with a speed of 5.1 km/h. The hunter uses a small powerboat that moves at a maximum speed of 12.3 km/h with respect to the water. What is the minimum time necessary for crossing?
*December 17, 2012 by Anonymous*

**physics**

A hunter wishes to cross a river that is 1.0 km wide and that flows with a speed of 4.9 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.6 km/h with respect to the water. What is the minimum time necessary for crossing?
*September 28, 2014 by jo*

**Physics HELP!**

A 50-g mass is attached to a spring and undergoes simple harmonic motion. Its maximum acceleration is 15m/s2 and its maximum speed is 3.5m/s . Determine the angular frequency. Determine the spring constant. Determine the amplitude of the motion. how do I find these things?
*December 9, 2014 by Jane*

**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 ...
*September 22, 2013 by lanaaaaaa*

**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
*September 23, 2012 by tiffany*

**Physics**

The maximum speed of a 3.68-kg mass attached to a spring is 0.688 m/s, and the maximum force exerted on the mass is 11.6 N. What is the amplitude of motion for this mass? (in m) What is the force constant of the spring? (in N/m) What is the frequency of this system? (in Hz)
*April 26, 2015 by Madison*

**physics**

a 60.00-kg athlete leaps straight up into the air from a trampoline with an intial speed of 9.0 m/s. The goal of this problem is to find the maxiumum height she attains and her speed at half maximum height. what are the interacting objects and how do they interact?
*November 3, 2012 by yue xing lu*

**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...
*October 22, 2012 by Sam*

**physics**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.50 x 104 rad/s to an angular speed of 3.76 x 104 rad/s. In the process, the bit turns through 3.13 x 104 rad. Assuming a constant angular acceleration, how long would it take the bit to ...
*April 9, 2014 by Anonymous*

**Physics**

A coiled Hookean spring is stretched 10 cm when a 1.5kg mass is hung from it. Suppose a 4 kg mass hangs from the spring and is set into vibration with an amplitude of 12 cm. A. Find the force constant of the spring. B. Find the Maximum restoring force acting on the vibrating ...
*February 16, 2011 by Kristin*

**Physics**

A cheetah starting form rest can reach a maximum speed of 28m.s in 2s and it can maintain this maxium speed for 15s after this it must rest. suppose an antelope and a cheetah initially at rest are seperated by a displcament of magnitude 100m.The antelope and cheetah see each ...
*November 11, 2011 by Sivashen*

**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 ...
*July 26, 2011 by noah*

**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?
*November 20, 2011 by shaz*

**maths**

Given p(x)=x^4+ax^3+bx^2+cx+d,such that x=0 is the only real root of p'(x)=0.If p(-1)<p(1),then in the interval [-1,1],which is maximum and minimum of p(-1) and p(1)?: a)p(-1) is minimum and p(1) is maximum. b)p(-1) is not minimum and p(1) is maximum. c)neither p(-1) is ...
*August 17, 2014 by Gunjan*

**maths**

Given p(x)=x^4+ax^3+bx^2+cx+d,such that x=0 is the only real root of p'(x)=0.If p(-1)<p(1),then in the interval [-1,1],which is maximum and minimum of p(-1) and p(1)?: a)p(-1) is minimum and p(1) is maximum. b)p(-1) is not minimum and p(1) is maximum. c)neither p(-1) is ...
*August 17, 2014 by Gunjan*