Saturday

December 20, 2014

December 20, 2014

Number of results: 29,595

**physics**

A merry-go-round starts from rest and accelerates uniformly over 26.0 s to a final angular velocity of 5.50 rev/min. (a) Find the maximum linear speed of a person sitting on the merry-go-round 4.25 m from the center. (b) Find the person's maximum radial acceleration. (c) Find ...
*March 14, 2012 by John*

**Physics**

A car is traveling around a horizontal circular track with radius r = 240 m at a constant speed v = 25 m/s as shown. The angle èA = 34° above the x axis, and the angle èB = 65° below the x axis. I found the car's acceleration to be 2.6 m/s^2 (a=v^2/r). Now I need to know the x...
*September 11, 2010 by Joy*

**college physics**

Car A accelerates from rest at 2m/s2. It passes Car B, which is at rest. Thirty (30) seconds later, the latter follows with a constant speed of 10m/s. Determine the distance in order to overtake the other.
*July 29, 2012 by Anonymous*

**Physics**

A car is traveling over the top of a hill, which we will model to be a piece of a circular arc of radius R. For each case below, draw careful to-scale motion maps and use them to construct the velocity vectors at the following three points: the top of the hill; equal time ...
*September 19, 2009 by Sonya*

**Physics**

A train travels between stations 1 and 2. The engineer of the train is instructed to start from rest at station 1 and accelerate uniformly between points A and B, then coast with a uniform velocity between points B and C, and finally accelerate uniformly between points C and D...
*September 17, 2006 by Becca*

**Physics**

A train travels between stations 1 and 2. The engineer of the train is instructed to start from rest at station 1 and accelerate uniformly between points A and B, then coast with a uniform velocity between points B and C, and finally accelerate uniformly between points C and D...
*October 6, 2011 by Elee*

**physics**

A mechanic pushes a 2.50 x 10^3 kg car from the rest to a speed of v, doing 5000J of work in the process. During this time, the car moves 25.0 m. Neglecting friction between car and road, find (a) v and (b) the horizontal force exerted on the car.
*October 22, 2007 by Anonymous*

**physics**

A compact car, mass 730 kg, is moving at 1.00 ✕ 102 km/h toward the east. The driver of the compact car suddenly applies the brakes hard for 1.9 s. As a result, an average force of 4.8 ✕ 103 N is exerted on the car to slow it down. What is the momentum now?
*October 26, 2014 by sarah*

**Physics**

A wheel of radius R starts from rest and accelerates with a constant angular acceleration alpha about a fixed axis. At what time t, will the centripetal and tangential accelerations of a point on the rim have the same magnitude?
*October 23, 2011 by Jc*

**physics-3**

A golf ball at a mini golf course travels 4.2 m along a carpeted green. When the ball reaches the hole 3.0 s later, its speed is 1.3 m/s. Assuming the ball undergoes constant uniform acceleration, what is the ball's initial speed?
*September 16, 2009 by NoNo100*

**Physics **

**I JUST NEED THE STEPS ON HOW TO SOLVE THE PROBLEMS** An object experiences an acceleration of 6.8m/s^2. As a result, it accelerates from rest to 24m/s. How much distance did it travel during that acceleration? A car which is traveling at a velocity of 15m/s undergoes an ...
*November 8, 2012 by Elyssa*

**Math**

Please help me! I don't even know where to start :( my teacher took this question up on friday but i was sick, and we have a test tomorrow! -Car A travels from Barrie to Subuiry at an average speed of 90km/h -Car B travels from Subury to Barrie at an average speed of 80km/h -...
*March 7, 2010 by Dawn*

**physics**

what net force is required to bring a 1500kg car to rest from a speed of 100kph within a distance of acceleration.
*August 2, 2012 by zianna*

**physics**

what net force is required to bring a 1500kg car to rest from a speed of 100kph within a distance of acceleration.
*August 2, 2012 by zianna*

**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 motorist travels at a constant speed of 34.0 m/s through a school zone; exceeding the posted speed limit. A policeman, waits 7.0 s before giving chase at an acceleration of 3.9 m/s2. (a) Find the time required to catch the car, from the instant the car passes the policeman...
*October 10, 2009 by Erin*

**Physics (Help Please)**

Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this? Many people imagine that the collision force exerted on the car is much greater than that experienced by...
*April 8, 2014 by Christian*

**College Physics **

Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this? Many people imagine that the collision force exerted on the car is much greater than that experienced by...
*April 10, 2014 by Christian*

**physics**

I have a question based off of the response to the question I posted below. Sorry, i wanted to make sure that i clearly understood,so My question about the third solution is: Is the horizontal force zero N? or is it 721.3N? A dragster and driver together have mass 918.8 kg. ...
*July 3, 2011 by alexa*

**Physics**

Car A is moving at a constant speed of 10.0 m/s and passes Car B which is at rest. 10 seconds after, the latter follows with an acceleration of 0.5 m/s2. Determine the distance that the latter has to travel before it overtakes the former. does it require quadratic formula? Oh ...
*August 12, 2012 by Anna*

**math**

The diagram below shows the speed time graph for a train travelling between two stations. The train starts from rest and accelerates uniformly for 150 seconds. It then travels at a constant speed for 300 seconds and finally decelerates uniformly for 200 seconds. Fig. Given ...
*June 2, 2012 by Anonymous*

**physics**

a car is traveling 20.0 m/s when the driver sees a child standing in the road. he takes 0.80 seconds to react, then steps on the brakes and slows at -7.0 m/s squared. how far does the car go before it stops?
*February 27, 2012 by allison*

**Mechanics**

a driver of a 1200-kg car notices that the car slows from 20 m/s to 15 m/s as it coasts a distance of 130 m along level ground. How large a force opposes the motion? Show the solution
*September 14, 2013 by Jason *

**Physics**

A car traveling at 20m/s when the driver sees a child standing in the road. He takes 0.80s to react, then steps on the brakes and slows at 7.0m/s^2. How far does the car go before it stops?
*January 22, 2014 by Sandara*

**physics**

a car traveled at uniform velocity of 20m/sec for 5 sec the brakes are applied and car retards uniformly and come to rest in further 8 sec.find a)distance traveled in first five sec b)distance traveled after breaks are applied c)total displacement during this period and its ...
*May 28, 2012 by parul*

**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.
*October 25, 2008 by Lucy*

**Physics**

A block slides down a frictionless plane having an inclination of 13.0°. If the block starts from rest at the top and the length of this incline is 1.62 m, find the acceleration of the block.
*October 31, 2010 by Bala*

**Physics**

A car is traveling along a straight road at a velocity of +31.0 m/s when its engine cuts out. For the next ten seconds, the car slows down further, and its average acceleration is a1. For the next five seconds, the car slows down further, and its average acceleration is a2. ...
*November 30, 2008 by Sara*

**physics**

Using your knowledge of the concept of inertia and Newton’s three laws of motion, recount what happens to: a) cars and b) passenger from the moment the car starts to slow down until it is brought to rest by a collision with a solid object.
*June 25, 2011 by kashish khatri*

**physics**

You are driving a car 35mi/h down the road. The stoplight in front of you suddenly turns red and you slam on the brakes, skidding to a halt. You get out of the car and measure the skid marks made by your tires to be 28.5m meters. (Assume positive x to be in the forward ...
*September 1, 2013 by JIll*

**physic**

A mechanic pushes a 2,500 kg car from rest to a speed v, with 5000J of work. During this process the car moves 25m. Neglecting friction, calculate: a) the final velocity of car b) The horizontal force exerted on the car
*November 7, 2010 by Luz*

**physics**

A car passes a policeman at speed v, well above the speed limit. The policeman accelerates his motorcycle at the time the car passes with constant acceleration a. In the graphs below, the two lines correspond to the motion of the cop and the motion of the speeder from the ...
*September 17, 2013 by Sue*

**physics **

A car has a maximum acceleration of 4.6m/s2 . What will the maximum acceleration be if the car is towing another car of the same mass?
*October 19, 2013 by Anonymous*

**physics **

A car has a maximum acceleration of 4.6m/s2 . What will the maximum acceleration be if the car is towing another car of the same mass?
*October 20, 2013 by Anonymous*

**PHYSICS**

A woman goes out running. She first travels 5.2km north. She then turns and travels 3.6km west. Finally, she turns again and travels 2.6km south. We are assuming a flat rectangular world. If a bird were to start out from the origin (where the woman starts) and fly directly (in...
*September 17, 2013 by Kaitlyn*

**physics**

A speeder passes a police car while traveling 130km/h. the police car imediently starts to accelerate at 10m/s^2 until the police car catches up to the speeder. how long does it take the police car to catch up?
*February 23, 2011 by Ty*

**physics**

A curve of radius 60m is banked so that a car traveling with uniform speed 70km/hr can round the curve without relying on friction to keep it from slipping to its left or right. The acceleration of gravity is 9.8m/s^2. What the the Angle of the curve? im using a=v^2/r, but ...
*September 17, 2006 by puff puff*

**Physics**

A car, starting from rest, accelerates down a hill reaching 30.0 m/s in 6.00 s. During this time, the driver notices that the fuzzy dice hanging by a string from the ceiling is perpendicular to the ceiling. Find (a) the angle θ of the hill and (b) the tension in the string.
*July 24, 2012 by Chad*

**physics**

suppose you want to design an air bag system that can protect the driver at a speed of 100 km/h if the car hits a brik wall estimate how fast the air bag must inflate to effectively protect the driver ?
*November 19, 2011 by nour*

**Math**

A vehicle starts w/ a full tank of gasoline and travels 150 miles. While refilling the tank, the driver notes that the vehicle used (1/4) tank of gasoline in traveling the 150 miles. Assuming the vehicle averages 25 miles per gallon, approximately how many gallons of gasoline ...
*April 21, 2009 by Helen*

**physics**

You are driving a car 33 down the road. The stoplight in front of you suddenly turns red and you slam on the brakes, skidding to a halt. You get out of the car and measure the skid marks made by your tires to be 23.5 meters (Assume positive x to be in the forward direction) ...
*January 11, 2013 by Ashley*

**honors physics**

A car is traveling on an interstate highway: a) Can the car have a negative velocity and a positive acceleration at the same time? Explain. b) Can the car's velocity change signs while it is traveling with constant acceleration? Explain.
*September 10, 2012 by sarah*

**physics.**

A car travels forward with constant velocity. It goes over a small stone, which gets stuck in the groove of a tire. The initial acceleration of the stone, as it leaves the surface of the road is, a)vertically up b)horizontally forward c)horizontally backwards d) zero e)greater...
*December 28, 2006 by me*

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 10.8 revolutions in 8.48 s before reaching its final angular speed. Calculate its angular acceleration.
*March 14, 2011 by Emily*

**Physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.71 revolutions in 1.29 s before reaching its final angular speed. Calculate its angular acceleration.
*September 30, 2012 by Arthur*

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration.
*October 4, 2012 by Emily *

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration.
*October 4, 2012 by Emily *

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration
*October 7, 2012 by Emily *

**Operations Management**

When you put the key in the ignition in your car and turn it, the car starts. Use your imagination in outlining the steps/processes/operations that must take place in order for the car to start.
*April 3, 2010 by Lazy Guy*

**physics**

A car speed up from 18m/s to 34 m/s in 2 seconds A) find the cars acceleration must write down all given information and show the work B) What does this acceleration tell us about the motion of the car?
*May 3, 2012 by lisa*

**Physics**

An object initially at rest experiences an acceleration of 1.4m/s2 for 8.0s and then travels at that constant velocity for another 6.0s . What is the object’s average velocity over the 14s interval?
*February 18, 2014 by Sherri*

**physics**

A car traveling at 150 miles/hour strikes a wall and bounces backwards at 30 miles/hour. If the car is in contact with the wall for 0.1 seconds, what is the force that the car exerts on the driver.
*March 24, 2013 by robert*

**physics**

A vehicle with a mass of 2 tons travels on a horizontal road at a speed of 126km/h.The driver notices a donkey at the side of the road and decides to reduce speed. The brakes are applied and the vehicle slows down to 72km/h after 5 seconds. Calculate the distance travelled ...
*March 6, 2013 by leslie*

**physics**

A motorcycle officer hidden at an intersection observes a car driven by an oblivious driver who ignores a stop sign and continues through the intersection at constant speed. The police officer takes off in pursuit 1.98 s after the car has passed the stop sign. She accelerates ...
*August 18, 2011 by laura*

**physics**

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

**physics**

A car is traveling 20m/s when the driver sees a child standing in the road. He takes 0.8s to react, then steps on the brakes and slows at 7.0m/s^2. How far does the car go before it stops? i dont know where to start.
*December 6, 2007 by Anonymous*

**physics**

A driver in a car traveling at a speed of 79 km/h sees a cat 107 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 103 m? Answer in units of s
*October 13, 2011 by Asdfghjkl*

**physics**

A driver in a car traveling at a speed of 70 km/h sees a cat 129 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 125 m? Answer in units of s
*December 14, 2011 by Anonymous*

**Physics**

Givent the initial velocity of the car, the driver's reaction time, and the coefficient of friction,find the total distance required far a car to stop. <------ What is the formula that I need to solve this?
*February 23, 2012 by TC*

**physics**

A driver in a car traveling at a speed of 66 km/h sees a cat 118 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 114 m? Answer in units of s
*September 25, 2012 by gabbie*

**physics**

A driver in a car traveling at a speed of 70 km/h sees a cat 129 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 125 m? answer in units of s
*September 30, 2013 by alex*

**physics**

A driver in a car traveling at a speed of 70 km/h sees a cat 129 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 125 m? answer in units of s
*September 30, 2013 by alex*

**physics**

You testify as an expert witness in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill (see the figure). You find that the slope of the hill is θ = 14.0°, that the cars were separated ...
*October 9, 2013 by kristy*

**physics**

You are driving to the grocery store at 20 m/s. You are 110 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.70 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply the ...
*September 15, 2014 by chidimma*

**algebra **

starting from 1.5 miles away, a car drives toward a speed checkpoint and then passes it. The car travels at a constant rate of 53 miles per hour. The distance of the car from the checkpoint is give by d=|1.5-53t|. At what time if the car o.1 miles from the checkpoint? Answer ...
*October 22, 2014 by Madison*

**Algebra**

A car travels West for 79 miles before turning at an angle of 22° North of East. The car continues on this path for 63 miles and stops. How far is the car from its starting point? Round your answer to the nearest tenth.
*February 13, 2012 by Katy*

**College Physics**

An object initially at rest experiences an acceleration of 1.4 m/s^2 for 5.0s and then travels at that constant velocity for another 7.0s. What is the object's average velocity over the 12s interval?
*December 11, 2010 by Kelly*

**Velocity and Acceleration**

A car is travelling on a highway Can it have a negative velocity & a positive acceleration at the same time? Can the car change d direction of its velocity when travelling with constant acceleration?
*October 5, 2011 by -Untamed-*

**physics**

A roller-coaster car with a mass of 550 kg starts at rest from a point 46 m above the ground. At point B, it is 23 m above the ground. [Express your answers in kilojoules (kJ).] (a) What is the initial potential energy of the car? Incorrect: Your answer is incorrect. . kJ (b) ...
*September 28, 2013 by Tammy*

**physics**

A car moving 17 m/s slows down at a uniform rate of 2.6 m/s2. How far does the car travel in 3.3 seconds?
*October 5, 2011 by Anonymous*

**Physics**

At an antique car rally, a Stanley Steamer automobile travels north at 38 km/h and a Pierce Arrow automobile travels east at 51 km/h. Relative to an observer riding in the Stanley Steamer, what are the x- and y-components of the velocity of the Pierce Arrow car?
*February 8, 2010 by Max*

**Physics**

At an antique car rally, a Stanley Steamer automobile travels north at 38 km/h and a Pierce Arrow automobile travels east at 51 km/h. Relative to an observer riding in the Stanley Steamer, what are the x- and y-components of the velocity of the Pierce Arrow car?
*February 9, 2010 by Max*

**physics**

An antique carousel that’s powered by a large electric motor undergoes constant angular acceleration from rest to full rotational speed in 6 seconds. When the ride ends, a brake causes it to decelerate steadily from full rotational speed to rest in 8.9 seconds. Compare the ...
*February 16, 2011 by olivia*

**physics**

a 70 kg rope climber starts from rest, moves with constant acceleration, and climbs 9 meters up a rope having a maximum strength of 840 N. What is the greatest possible speed she can have afte climbing 9m?
*November 27, 2007 by bex*

**physics**

A skier is accelerating down a 30.0° hill at a = 4.10 m/s2 a) What is the vertical component of her acceleration? b) How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if the elevation change is 340 m?
*October 31, 2010 by Haley*

**physics**

A skateboarder starts from rest at the top and skates down a slope as shown. After 2.5 seconds, the skateboarder has reaches a speed of 10 metres per second. What is the skateboarder's acceleration?
*February 25, 2013 by Kirsty Williams*

**physics**

A homogeneous ball with mass m=1 g and total charge q=10^−3 C (uniformly distributed) is placed on a horizontal xy plane. The balls starts rolling without slipping under the influence of a uniform electrostatic field E(vector) =(E,0,0) with E=1 V/m. Find the acceleration...
*May 27, 2013 by ss*

**physics/algebra**

A 74.0kN kN spaceship comes in for a vertical landing. From an initial speed of 1.00 km/s {\rm km/s}, it comes to rest in 2.40min min with uniform acceleration. What braking force must its rockets provide? Ignore air resistance.
*October 6, 2013 by deb*

**Physics**

The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 46 m in a straight line, reaching a final speed of 83 km/h. (a) Determine the cheetah's average acceleration during the short sprint. (b) Find...
*September 14, 2012 by Claire*

**Physics**

A girl starts from rest and reaches a walking speed of 1.4 m/s in 3.0 s. She walks at this speed for 6.0 s. Girl then slows down and comes to a stop during a 10.0 -s period. What was her acceleration during each of the 3 time periods? Her acdeleration entire trip!? Ok so i ...
*March 25, 2013 by Ariel*

**College Physics**

A 1200-kg car going 30 m/s applies its brakes and skids to rest. If the friction force between the sliding tires and the pavement is 6000 N, how far does the car skid before coming to rest? Can you help me get the formula to use . Thanks
*February 11, 2010 by edwin*

**physics**

An airplane starts from rest at the end of a runway and accelerates at a constant rate. In the first second, the airplane travels 1.11 m. What is the speed of the airplane at the end of the second second?
*February 19, 2012 by suri*

**Physics**

a car travels at 20km/h for 1.5h, at 30km/h for 2.0h, and at 40kmh for 0.75 h. What is the car average velocity
*August 1, 2011 by Jazz*

**physics**

The car has a mass of 1200kg Calculate the kinetic of the car when it travels at a speed of 12 m/s.
*February 16, 2012 by Dan*

**physics**

a car is moving with a uniform speed of 15.0 m/s along a straight path. what is the difference covered by the car in 12.0 minutes?
*October 5, 2009 by jasmine*

**Physics**

A driver in a car traveling at a speed of 76 km/h sees a cat 109 m away on the road. How long will it take for the car to acceler- ate uniformly to a stop in exactly 106 m? Answer in units of s
*September 25, 2012 by Lily*

**physics**

A car accelerates from 80 to 90 , while a moped accelerates from 0 to 20 in twice the time. Which of the following is true? they both have the same magnitude of acceleration the moped has the greater acceleration the car has the greater acceleration
*September 23, 2011 by raheema*

**Business Law**

Miguel buys a truck in Texas and then moves to Washington. A year later, he is driving his truck in Oklahoma, and causes an accident by running into another car, whose driver is from Florida. In what states will the other driver be able to sue Miguel? State the reasons for ...
*February 16, 2010 by Micky*

**Business Law**

Miguel buys a truck in Texas, then moves to Washington. A year later, he is driving his truck in Oklahoma, and causes an accident by running into another car, whose driver is from Florida. In what states will the other driver be able to sue Miguel? State the reasons for your ...
*May 24, 2010 by Britney*

**business law**

Miguel buys a truck in Texas, then moves to Washington. A year later, he is driving his truck in Oklahoma, and causes an accident by running into another car, whose driver is from Florida. In what states will the other driver be able to sue Miguel? State the reasons for your ...
*September 25, 2010 by Anonymous*

**business law**

Miguel buys a truck in Texas, then moves to Washington. A year later, he is driving his truck in Oklahoma, and causes an accident by trning into another car, whose driver is from Florida. In what states will the other driver be able to sue Miguel? State the reasons for your ...
*April 26, 2012 by Ann*

**physics**

a 1300 kg car starts from rest at A , coasts 170m through a dip and comes to stop at B after coasting a distance d on level ground . if the rolling resistance is a constant force of 220N , determine the distance d .
*February 25, 2012 by Anonymous*

**Physics**

a 981 kg test car travels around a circular track with a radius of 0.625 km. if the magnitude of centripetal force is 2433, what is the cars speed? what is the cars centripetal acceleration?
*November 25, 2014 by Alejandro*

**Physics**

Rona is driving a car, she travels a 40-90 km/hr and accelerates at 2m/s. How long will take for her to stop the car?
*January 2, 2011 by DAnielle*

**Physics**

a car traveling at 13 m/s^2 for 8.00 seconds. what is the distance the car travels? show all work
*December 8, 2011 by Anonymous*

**math**

a car travels at an average speed of 100 km/hr. how many km will the car travel in 2 hours, 15 min?
*February 13, 2013 by Lori*

**mathematics**

If a car travels at a constant speed of 112 km/h, How far will the car travel in 15 minutes.
*March 6, 2014 by melony henry*

**Physics**

A car travels east at 82 km/h for 1.5 h. It then travels 30.0° east of north at 113 km/h for 1.6 h. What is the average velocity for the trip? (Magnitude and Direction)
*August 28, 2009 by A*

**Physics**

A race car driver drives her 1500 kg car around a circular turn, which is banked at an angle of 20 degrees to the horizontal. If the car is traveling around the frictionless curve of radius 100m, a) What is providing the center-seeking force on the car? (ie. centripetal force...
*December 1, 2009 by Anonymous*

**physics**

A stone is suspended from the free end of a wire that is wrapped around the outer rim of a pulley, as shown in the figure (see the figure ). The pulley is a uniform disk with mass 10.4 and radius 51.0 and turns on frictionless bearings. You measure that the stone travels a ...
*May 13, 2012 by Anonymous*

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