Friday

April 18, 2014

April 18, 2014

Number of results: 77,085

**Physics - acceleration..need to find velocity**

If v=10 when t= -2, and you have negative acceleration, v is decreasing. How can it increase to 44.7? Is there a typo in here somewhere?
*Friday, October 21, 2011 at 11:22am by Steve*

**college physics**

A cylindrical stone column of diameter 2R = 1.47 m and height H = 4.46 m is transported in standing position by a dolly. When the dolly accelerates or decelerates slowly enough, the column stands upright, but when the dolly’s acceleration magnitude exceed a critical value ac, ...
*Tuesday, April 13, 2010 at 6:22pm by eric*

**physics**

Vector A has a magnitude of 23 units and points in the positive y-direction. When vector B is added to A, the resultant vector A+B points in the negative y-direction with a magnitude of 15 units. Find the magnitude of B?
*Tuesday, September 21, 2010 at 6:41pm by jc*

**Physics**

Vector {A} points in the negative y direction and has a magnitude of 14 units. Vector {B} has twice the magnitude and points in the positive x direction. Find the direction and magnitude of {A}+{B} counterclockwise from the positive x axis.
*Saturday, February 4, 2012 at 4:44pm by Jan*

**Physics**

A small car (mass 380 ) is pushing a large truck (mass 1000 ) due east on a level road. The car exerts a horizontal force of 1580 on the truck. What is the magnitude of the force that the truck exerts on the car?
*Saturday, July 28, 2012 at 7:17am by anonymous*

**physics**

A car traveling 95 km/h slows down at a constant 0.80 m/s^2 just by "letting up on the gas. A) Calculate the distance it travels during the second second. B) Calculate the distance it travels during ninth second.
*Friday, July 8, 2011 at 5:48pm by mike*

**dynamics**

traveling with an initial speed of 70km/h. a car accelerates at 6000km/hr^2 along a straight road. how long will it take to reach a speed of 120km/hr? also, through what distance does the car travel during this time.?
*Wednesday, April 18, 2012 at 4:47am by chanz11*

**Algebra grade 7**

one day victor was riding in the car with his dad and saw a sign that read 500 km to Indianapolis. about how many hours did it take to get to Indianapolis if the car was traveling at 60 mph. 1 mi = 1.61 km
*Saturday, September 29, 2012 at 5:01pm by randomchik*

**Physics URGENT**

A speeder passes a parked car at 35.0 m/s. The police car starts from rest with a uniform acceleration of 2.41 m/s^2. A.) How much time passes before the speeder is overtaken by the police car? B.) How far does the speeder get before being overtaken by the police car?
*Monday, February 14, 2011 at 6:47pm by Shannon*

**chemistry**

All of these problems can be solved with the perfect gas law relationship P V/T = constant For example, in #3, T is constant so P*V = constant. Therefore P1*V1 = P2*V2, where "1" and "2" refer to initial and final conditions. 50 kPA*5.0 L = 125 kPa * P2 P2 = (50/125)*5.0 = 2.0...
*Friday, October 10, 2008 at 9:13am by drwls*

**physics**

A car makes a 60-km trip with an average velocity of 38.5-km/h in a direction due north. The trip consists of three parts. The car moves with a constant velocity of 25 km/h due north for the first 15 km and 62 km/h due north for the next 32 km. With what constant velocity does...
*Friday, September 17, 2010 at 6:09pm by Akruti*

**Physics**

A car drives straight off the edge of a cliff that is 58 m high. The police at the scene of the accident note that the point of impact is 126 m from the base of the cliff. How fast was the car traveling when it went over the cliff? Can someone please solve?
*Wednesday, October 20, 2010 at 7:16pm by Anonymous*

**Physics Really Need Help Please**

At time t=0 a grinding wheel has an angular velocity of 26.0 rad/s. It has a constant angular acceleration of 25.0 rad/s^2 until a circuit breaker trips at time t = 2.50 s. From then on, the wheel turns through an angle of 440 rad as it coasts to a stop at constant angular ...
*Friday, November 7, 2008 at 9:34pm by Samantha*

**Physics**

part 1 of 3: A hawk flies in a horizontal arc of radius 9.9 m at a constant speed of 4.8 m/s. Find its centripetal acceleration. Answer in units of m/s^2. part 2 of 3: It continues to fly along the same horizontal arc but increases its speed at the rate of 1 m/s^2. Find the ...
*Monday, November 19, 2012 at 3:50pm by Sarah*

**Physics**

part 1 of 3: A hawk flies in a horizontal arc of radius 9.9 m at a constant speed of 4.8 m/s. Find its centripetal acceleration. Answer in units of m/s^2. part 2 of 3: It continues to fly along the same horizontal arc but increases its speed at the rate of 1 m/s^2. Find the ...
*Monday, November 19, 2012 at 4:29pm by kate*

**Physics **

part 1 of 3: A hawk flies in a horizontal arc of radius 9.9 m at a constant speed of 4.8 m/s. Find its centripetal acceleration. Answer in units of m/s^2. part 2 of 3: It continues to fly along the same horizontal arc but increases its speed at the rate of 1 m/s^2. Find the ...
*Monday, November 19, 2012 at 5:12pm by kate*

**Physics **

part 1 of 3: A hawk flies in a horizontal arc of radius 9.9 m at a constant speed of 4.8 m/s. Find its centripetal acceleration. Answer in units of m/s^2. part 2 of 3: It continues to fly along the same horizontal arc but increases its speed at the rate of 1 m/s^2. Find the ...
*Monday, November 19, 2012 at 5:18pm by kate*

**PHYSICS**

A yo-yo-shaped device mounted on a horizontal frictionless axis is used to lift a 19-kg box. The outer radius R of the device is 0.50 m, and the radius r of the hub is 0.20 m. When a constant horizontal force Fapp of magnitude 154 N is applied to a rope wrapped around the ...
*Saturday, March 24, 2007 at 3:23pm by Calvin*

**physical science**

A small car with a weight of 2000 lb traveling at 30 mph can stop in about 100 ft. How far does it take for a large SUV weighing 8000 lb to stop if it is also traveling at 30 mph?
*Thursday, December 15, 2011 at 8:49pm by Fonda*

**chemistry**

A 2.30 mole quantity of NOCl was initially in a 1.50 L reaction chamber at 400°C. After equilibrium was established, it was found that 20.0 percent of the NOCl had dissociated: 2NOCl(g) 2NO(g) + Cl2(g) Calculate the equilibrium constant Kc for the reaction.
*Thursday, March 17, 2011 at 2:10am by Anonymous*

**physics**

A 3.1 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 19.5◦ with the horizontal. An average frictional force of 4.4×103 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 4.9 m/s. The acceleration...
*Thursday, October 17, 2013 at 5:26pm by Anonymous*

**Physics**

A 4.0 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 19.6◦ with the horizontal. An average frictional force of 4.0×103 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 4.9 m/s. The acceleration...
*Friday, December 6, 2013 at 7:54pm by Artemis*

**Physics**

Electrons are accelerated to reach a kinetic energy of 250 eV (= 4.0 x 10-17 J). If the acceleration is done in a distance of 0.20 m, what is the magnitude of the electric field causing the acceleration?
*Tuesday, March 12, 2013 at 3:47pm by Lauren*

**physics**

You are driving to the grocery store at 12.2 m/s. You are 193.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.790 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply...
*Tuesday, October 7, 2008 at 7:17pm by Deepa*

**Physics**

You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply...
*Tuesday, October 5, 2010 at 7:55pm by Emily*

**Physics**

You are driving to the grocery store at 18.2 m/s. You are 120.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.270 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply...
*Tuesday, October 5, 2010 at 8:28pm by Bala*

**Physics**

You are driving to the grocery store at 18.2 m/s. You are 120.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.270 s and that your car brakes with constant acceleration.How far are you from the intersection when you begin to apply ...
*Tuesday, October 5, 2010 at 8:37pm by Bala*

**ph**

You are driving to the grocery store at 18.2 m/s. You are 120.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.270 s and that your car brakes with constant acceleration.How far are you from the intersection when you begin to apply ...
*Tuesday, October 5, 2010 at 9:36pm by Bala*

**Physics**

You are driving to the grocery store at 18.2 m/s. You are 120.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.270 s and that your car brakes with constant acceleration.How far are you from the intersection when you begin to apply ...
*Tuesday, October 5, 2010 at 9:15pm by Bala*

**Physics**

You are driving to the grocery store at 18.2 m/s. You are 120.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.270 s and that your car brakes with constant acceleration.How far are you from the intersection when you begin to apply ...
*Tuesday, October 5, 2010 at 9:36pm by Bala*

**Physics**

You are driving to the grocery store at 18.2 m/s. You are 120.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.270 s and that your car brakes with constant acceleration.How far are you from the intersection when you begin to apply ...
*Tuesday, October 5, 2010 at 10:22pm by Bala*

**Physics**

You are driving to the grocery store at 12.7 m/s. You are 108.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.470 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply...
*Saturday, January 28, 2012 at 3:31pm by Dave*

**Algebra**

I'm having a little trouble with this problem... Please try and walk me through the problem, too: #1. A motorboat leaves a dock and travels at an average speed of 15 mi/h toward an island. The average speed on the return trip is 10 mi/h. How far is the island from the harbor ...
*Thursday, November 20, 2008 at 4:43pm by Celina*

**Physics**

Driving in your car with a constant speed of v=13.0 m/s, you encounter a bump in the road that has a circular cross section. If the radius of curvature of the bump is r=33.2 m, calculate the force the car sear exerts on a 72.7 kg person as the car passes over the top of the ...
*Saturday, October 13, 2007 at 4:49pm by Jack*

**physics**

Rocket-powered sleds are used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 444 m/s in 1.80 s and can be brought to a stop again in 2.15 s. (b) Find the acceleration of the sled as it is braking and compare it to the ...
*Friday, November 26, 2010 at 1:47am by javane*

**physics**

Two cars start from rest at the same location and at the same instant and race along a straight track. Car A accelerates at 6.6 fps2 to a speed of 90 mph and then runs at this constant speed. Car B accelerates at 4.4 fps2 to a speed of 96 mph and then runs a a constant speed...
*Saturday, January 22, 2011 at 2:06pm by David*

**PHY 131**

three forces act on a moving force object. one cforce has a magnitude of 80.O N and is directed due north. another has a magnitude of 60.0N and is due west. What must the magnitude and direction of the 3rd force, such that the object continues to move at a constant velocity.
*Tuesday, March 23, 2010 at 5:17pm by S.Strange*

**Physics**

A car of mass 900.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 49.7 km/hr (13.8 m/s), the net power which the engine supplies is 4300.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate ...
*Thursday, January 2, 2014 at 4:05pm by Sam*

**Physics**

A car of mass 900.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 49.7 km/hr (13.8 m/s), the net power which the engine supplies is 4300.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate ...
*Thursday, January 2, 2014 at 6:31pm by Adam*

**MATH Trouble HURRY!!!!**

If the scale factor from a small figure to a large figure is given as a percent, how can you find the side lengths of the large figure from the side lengths of the small figure? 34 percent is 34/100 Set that equal to small/large 34/100=small/large, and solve for large. Can you...
*Thursday, January 4, 2007 at 8:53pm by HelpMe*

**Chemistry**

3. 25.0 mL of a 0.50 M solution of acid HA was combined with 25.0 mL of a 0.50 solution of base MOH in a calorimeter with a calorimeter constant of 13.5 J/ C. The initial temperature of the solution was 23.3 C and the maximum temperature was 34.7 C. The resulting solution had ...
*Tuesday, April 16, 2013 at 6:26pm by Kim*

**Physics**

A horse pulls on a crate with a 1,000 N force, causing it to move at constant velocity. What is the acceleration of the cart? A 44-kg child steps onto a scale. What is the magnitude of the force that the scale exerts on the child
*Friday, July 15, 2011 at 12:41am by Kandi*

**Trigonometry**

The tires on a car have radius 14 inches. Find the angular speed of the car tire in revolutions per second when it is traveling 70 mph. Find the angular speed at 80 mph. The tires on a car are 15 inches. Find the linear speed of the car when the tires are rotating at 900 ...
*Saturday, January 21, 2012 at 3:03pm by Will*

**physics**

A cart of mass 340 g moving on a frictionless linear air track at an initial speed of 1.2 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision the first cart continues in its original direction at .66m/s. a) what is the mass...
*Sunday, March 4, 2007 at 9:28am by Chris*

**Physics**

A car of mass 1200kg starts from rest, accelerates uniformly to a speed of 4.0 meters per second in 2.0 seconds and continues moving at this constant speed in a horizontal straight line for an additional 10 seconds. the brakes are then applied and the car is brought to rest in...
*Tuesday, December 4, 2012 at 5:00am by Ken*

**Physics**

A driver of a car going 95.0 km/h suddenly sees the lights of a barrier 39.0 m ahead. It takes the driver 0.95 s before he applies the brakes, and the average acceleration during braking is -10.0 m/s2. What is the maximum speed at which the car could be moving and not hit the ...
*Tuesday, February 15, 2011 at 6:12pm by johnny*

**Physics**

A free electron and a free proton are exactly 0.70cm apart. Find the magnitude of the acceleration of the proton. Express your answer with the appropriate units. Find the direction of the acceleration of the proton. Find the magnitude of the acceleration of the electron. ...
*Friday, January 24, 2014 at 4:59pm by James*

**physics**

When four people with a combined mass of 320 kg sit down in a car, they find that the car drops .80 cm lower on its springs. THen they get out of the car and bounce it up and down. What is the frequency of the car's vibration if its mass (empty) is 2.0 X 10^3 kg? The spring ...
*Thursday, March 15, 2007 at 4:37pm by sam*

**physics**

A toy car rolls at a constant speed down a straight inclined track. When the car reaches the flat surface at the base of the inclined track, the speed of the car decreases.
*Wednesday, August 10, 2011 at 12:16pm by betsy*

**Algebra**

This is a quadratic, so we'll try to factor it into (x+a)(x+b). The constant term is positive, so we know that a and b have the same sign. The x term is negative, so we know a and b are both negative. We need to find two negative numbers, a and b, such that a*b = 35 and a+b...
*Sunday, December 7, 2008 at 8:34pm by Noether*

**physics**

A long uniform rod of length 4.76 m and mass 5.48 kg is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest in a vertical position as in the figure. (A) At the instant the rod is horizontal, find its angular speed. The acceleration of ...
*Friday, October 31, 2008 at 10:27am by Molly86*

**physics**

A long uniform rod of length 4.76 m and mass 5.48 kg is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest in a vertical position as in the figure. (A) At the instant the rod is horizontal, find its angular speed. The acceleration of ...
*Sunday, November 2, 2008 at 9:18pm by Anonymous*

**physics**

In a large hotel, a fast elevator takes you from the ground floor to the 21st floor. The elevator takes 17 s for this trip: 5 s at constant acceleration, 7 s at constant velocity, and 5 s at constant deceleration. Each floor in the hotel has a height of 2.5 m. Calculate the ...
*Monday, September 26, 2011 at 6:03pm by K*

**physics**

Question Part Points Submissions Used A thin cylindrical rod of length 3.00 m and mass 1.5 kg has two spheres attached on its ends. The centers of the spheres are 1.50 m from the center of the rod. The mass of each sphere is M = 0.72 kg. The rod and spheres are initially at ...
*Sunday, December 2, 2012 at 10:10pm by HALP!!!*

**Physics**

A 76.3-kN car is travelling at 68.7 mph when the driver decides to exit the freeway by going up a ramp. After coasting 355 m along the exit ramp the car\'s speed is 30.1 mph, and it is h = 14.3 m above the freeway. What is the magnitude of the average drag force exerted on the...
*Monday, April 29, 2013 at 9:25pm by Help*

**12th grade Physics**

In an experiment, a car taveling at 88m/s,west slams into a wall and comes to a halt in 0.75 seconds. What is the car's acceleration vector?
*Tuesday, October 7, 2008 at 6:45pm by Jane*

**physics**

5)As the traffic light becomes green, a car starts to travels with an acceleration of 2.5 m/s2. Calculate the velocity of this car in km/h after 12 seconds of acceleratio
*Tuesday, December 14, 2010 at 4:16pm by faisal*

**Physics**

A car of mass 1900kgs accelerates from rest to a speed of 27ms-1 in 8.1s.Calculate the average rate at which kinetic energy is supplied to the car during the acceleration.
*Saturday, March 15, 2014 at 8:28am by Gilbert*

**Physics**

Say the angular velocity of the wheel is w and the linear velocity of the car is v Say the angular acceleration of the wheel is alpha and the linear acceleration of the car is a Say radius of wheel is r Then for the no slip car: forward velocity of axle v = w r forward ...
*Saturday, April 5, 2008 at 3:35am by Damon*

**physics**

a car starts from rest and accelerates at in a straight line at a constant rate of 4.5m/s/s. How far will the car travel in 35 seconds.
*Tuesday, November 22, 2011 at 3:01pm by al*

**Physic**

They would accelerate initially at the same acceleration, a m/s/s. Total mass, M = m1+m2 = 5.91 + 7.67 kg Force, F = 5.09 N. Acceleration, a = F/M The contact force is the force required to set the farther block in motion at the calculated acceleration a. The force is in turn ...
*Tuesday, September 22, 2009 at 11:28am by MathMate*

**physics**

1. How far (in meters) must a 600 kg pile driver fall, if it is to do 14000 J of work? 2. A spring whose spring constant is 150 N/m is compressed 0.800 m. What speed (in meters/second) can it give to a 0.600 kg ball when released? 3. A 550 N crate rests on the floor. How much ...
*Wednesday, July 7, 2010 at 6:51pm by Ricky*

**physics**

1. How far (in meters) must a 600 kg pile driver fall, if it is to do 14000 J of work? 2. A spring whose spring constant is 150 N/m is compressed 0.800 m. What speed (in meters/second) can it give to a 0.600 kg ball when released? 3. A 550 N crate rests on the floor. How much ...
*Wednesday, July 7, 2010 at 6:53pm by Ricky*

**physics**

The magnitude of the vectors F is 20 N, the force on the right is applied at an angle 55◦ and the the mass of the block is 75 kg. If the surface is frictionless, what is the magnitude of the resulting acceleration? Answer in units of m/s2.
*Friday, February 12, 2010 at 10:56pm by sally*

**Physics**

In designing a velocity selector that uses uniform perpendicular electric and magnetic fields, you want to select positive ions of charge +5e that are traveling perpendicular to the fields at 8.75 km/s. The magnetic field availabe to you has a magnitude of 0.550 T. (a) What ...
*Monday, February 18, 2008 at 9:34pm by J*

**Physics **

A car with mass of 1875kg is traveling along a country road when the driver sees a deer dart out onto the road. The driver slams on the brakes manages to stop before hitting the deer. The driver of a second car with 2135kg is driving too close and does not see the deer. When ...
*Monday, October 4, 2010 at 8:41am by Shaila*

**Physics**

a jetliner traveling northward is landing with a speed of 80 m/s. Once the jet touches down, it has 800 m of runway in which to reduce its speed to 10 m/s. (a) Compute the average acceleration (magnitude and direction) of the plane during landing (take the direction of the ...
*Wednesday, December 8, 2010 at 11:21am by Geri*

**Physics**

what does it mean to have a constant acceleration does that mean that a= 0 or a=x? I particularly need help with::::>> Suppose the pilot, starting again from rest, opens the throttle only partway. At a constant acceleration, the airboat then covers a distance of 64.2 ...
*Saturday, October 24, 2009 at 8:19pm by Brit*

**Math-Algebra 1**

(x+4)(x+11) = 34 x^2 + 15 x + 44 = 34 x^2 + 15 x + 10 = 0 x = [ -15 + /- sqrt (225 -40)/2 x = [ -15 +/- 13.6 ] / 2 x = -14.3 or - .7 discard -14.3 because negative length and with would result so use x = -.7
*Monday, February 24, 2014 at 9:08pm by Damon*

**Physics**

A car makes a trip due north for three fourths of the time and due south one-fourth of the time. The average northward velocity has a magnitude of 27m/s, and the average southward velocity has a magnitude of 17m/s. What is the average velocity, magnitude and direction of the ...
*Sunday, September 14, 2008 at 1:45pm by DELLI*

**physics]**

a body moving along a straight line at 20 m/s undergoes an acceleration of 4 metre per second square.after two seconds what will be its speed? also, find the displacement .
*Saturday, May 14, 2011 at 4:16am by agasjh*

**PHYSICS**

A railroad diesel engine weighs 3.9 times as much as a freight car. The diesel engine coasts at 5.3 km/h into the freight car that is initially at rest. After they couple together, what is their speed?
*Monday, September 10, 2012 at 11:12am by Maggie*

**PHYSICS**

A railroad diesel engine weighs 3.9 times as much as a freight car. The diesel engine coasts at 5.3 km/h into the freight car that is initially at rest. After they couple together, what is their speed?
*Monday, September 10, 2012 at 11:13am by Maggie*

**geometry**

For problems 7 and 8, find the magnitude and direction angle of the given vector. 7. <3, 4> A magnitude: 5; direction angle: 53.13° B magnitude: √ 5; direction angle: 53.13° C magnitude: √5; direction angle: 3.40° D magnitude: √5; direction angle: 0.80...
*Wednesday, December 14, 2011 at 6:28pm by Cam*

**Physics**

Vector Aarrowbold points in the negative y direction and has a magnitude of 8 units. Vector Barrowbold has the same the magnitude and points in the positive x direction. Find the direction and magnitude of the following vectors. a) Aarrowbold + Barrowbold magnitude direction...
*Friday, October 12, 2012 at 1:28pm by HELP*

**physics**

a 20 g ball of clay traveling east at 2.0 m/s collides with a 30 g ball of clay traveling 30m degrees south of west at 1.0 m/s. what are the speed and direction of the resulting 50 g of clay?
*Monday, June 28, 2010 at 6:48pm by mary*

**Trig/Physics**

A car's wheel (with tire) is 26 inches in diameter and its center is 12 inches above the road. If the car is traveling at 60 feet per second, how fast is the highest point of the tire moving relative to the ground?
*Sunday, September 23, 2007 at 8:00pm by Vash*

**physics**

Approaching a flashing pedestrian activated traffic light, a driver must slow down to a speed of 30km/h. If the cross walk is 150m away and the vehicle's initial speed us 59km/h, what must be the magnitude of the car's acceleration to reach the speed limit? Answer is 0.41m/s^2...
*Wednesday, July 3, 2013 at 7:32pm by jason*

**PHYSICS**

Particles 1 and 2, each of mass m, are attached to the ends of a rigid massless rod of length L1 + L2, with L1 = 19 cm and L2 = 75 cm. The rod is held horizontally on the fulcrum and then released. What is the magnitude of the initial acceleration of particle 1? What is the ...
*Saturday, March 24, 2007 at 2:51pm by Calvin*

**physics**

Cora is a passenger in a car traveling east along a country highway that is parallel to a railroad track and clear of any traffic. Her friend Liz is driving. They come up behind the last car of a train on the track. Initially, the train is moving a little slower than they are...
*Monday, January 30, 2012 at 3:30pm by Kathy*

**Physics**

A 4.2 × 10^3 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 18.4◦ with the horizontal. An average frictional force of 4.1×10^3 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 4.9 m/s. The ...
*Wednesday, December 12, 2012 at 10:11pm by alice*

**Physics**

A 3.5 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.9◦ with the horizontal. An average frictional force of 4.1×103 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 4.2 m/s. The acceleration...
*Thursday, October 17, 2013 at 5:30pm by Willow*

**Physics**

A 3.5 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.9◦ with the horizontal. An average frictional force of 4.1×103 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 4.2 m/s. The acceleration...
*Thursday, October 17, 2013 at 5:36pm by Willow*

**Physics**

A 3.5 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.9◦ with the horizontal. An average frictional force of 4.1×103 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 4.2 m/s. The acceleration...
*Thursday, October 17, 2013 at 5:41pm by Willow*

**Math**

The depreciation rate, r, for a $50,000 news car is given by the function r = 1 - (V/50,000)^(1/5), where V is the value of the car when it is five years old. a) What is the depreciation rate for a $50,000 BMW that is worth $28,000 after 5 years? (I already found the answer to...
*Thursday, November 22, 2012 at 7:21pm by Kayla*

**physics**

A car of mass M = 800kg traveling at 40.0km/hour enters a banked turn covered with ice. The road is banked at an angle θ, and there is no friction between the road and the car's tires. (Figure 1) . Use g = 9.80m/s2 throughout this problem. Part A What is the radius r of ...
*Tuesday, October 15, 2013 at 2:52pm by Lidia*

**General Chemistry**

The correct word is photoelectric, not photogenic. You used the correct word later in the question. Photogenic means something else entirely. To solve this problem, set the photon energy requirement equal to the work function, 4.34 x 10^-19 J. Then set that equal to the photon...
*Sunday, January 13, 2008 at 4:54am by drwls*

**physics**

An electron has an initial speed of 178000 m/s. If it undergoes an acceleration of 4.8 x 1014 m/s2, how far has it traveled before reaching a speed of 789000 m/s? Answer in units of m.
*Wednesday, August 24, 2011 at 10:19am by Hannah*

**physics**

An electron has an initial speed of 178000 m/s. If it undergoes an acceleration of 4.8 x 1014 m/s2, how far has it traveled before reaching a speed of 789000 m/s? Answer in units of m.
*Wednesday, August 24, 2011 at 10:19am by Hannah*

**physics**

In many countries, automatic number plate recognition is used to catch speeders. The system takes a time-stamped license plate photo at one location (like an on-ramp to a freeway), and then takes a second time-stamped photo at a second location a known distance from the first ...
*Saturday, September 1, 2012 at 12:52pm by Natasha*

**physics**

The magnitude of vector A is 18 units at an angle of 90 degrees with the x-axis, and the magnitude of vector B is 12 units at an angle of 330 degrees with the x-axis. What vector C must be added to the vectors A and B so that the resultant of these three vectors points in the ...
*Saturday, March 31, 2012 at 10:38am by Ro2ita*

**Physics help please!!!**

A 2.10 kg frictionless block is attached to an ideal spring with force constant 315N/m . Initially the block has velocity -3.75m/s and displacement 0.270m . Find (a) the amplitude of the motion. (b) the maximum acceleration of the block. (c) the maximum force the spring exerts...
*Tuesday, March 27, 2012 at 1:29pm by john*

**physics**

(a) A car with a mass of 950 kg is moving to the right with a constant speed of 1.45 m/s. What is the total force on the car? (b) What is the total force on the car if it is moving to the left?
*Friday, February 21, 2014 at 10:58am by Anon*

**chemistry**

A fixed amount of gas initially at 100 K and pressure P1 is expanded from 1 L to 100 L in a piston. The temperature, T2, of the gas at this point is 50 K. The piston is then locked at constant volume V2=100 L and half the gas is pumped out at a constant temperature of T2 . The...
*Monday, December 5, 2011 at 6:51pm by laura *

**Physics-Charges**

A wall has a negative charge distribution producing a uniform horizontal electric field. A small plastic ball of mass 0.0261 kg, carrying charge of −102 μC, is suspended by an uncharged, nonconducting thread 0.369 m long. The thread is attached to the wall and the ...
*Wednesday, March 7, 2012 at 6:32pm by Joila*

**college physics**

Two blocks of masses m1 = 4.00 kg and m2 = 3.00 kg are placed in contact with each other on a frictionless horizontal surface. A constant force F = 9.00 N is applied to the block of mass m1. a) Determine the magnitude of the acceleration of the two-block system. b) Determine ...
*Saturday, February 11, 2012 at 12:56pm by lacrosse*

**Physics - Torque**

A particle is acted on by two torques about the origin: T1 has a magnitude of 4.3 N*m and is directed in the positive direction of the x axis, and T2 has a magnitude of 3.2 N*m and is directed in the negative direction of the y axis. What are the magnitude [in N*m] and ...
*Saturday, March 31, 2007 at 6:01am by COFFEE*

** scienc**

I'm driving my car of mass 1000 kg at 100 km/hr when I accidentally hit the rear end of a truck of mass 5000 kg traveling in the same direction at 90 km/hr. My car and the truck lock together and move as a single object. Let F1 be the force the truck exerts on my car and let ...
*Monday, March 18, 2013 at 12:33am by ayan*

**grade 11 physics**

(a) Your acceleration could have been computed more quickly as a = [v(2) - v(1)] = -5.0 / 25 = -0.2 m/s^2 Note that is it negative. (b) Force = ma = 1452*(-0.2) = -290 N (the minus sign means the force is backwards). (c) To decelerate a car in 3 s from a speed of 25 m/s, the ...
*Sunday, January 24, 2010 at 9:17am by drwls*

**physics**

A particle moves along the x axis. It is initially at the position 0.280 m, moving with velocity 0.080 m/s and acceleration -0.240 m/s2. Suppose it moves with constant acceleration for 3.10 s. (a) Find the position of the particle after this time. (b) Find its velocity at the ...
*Wednesday, May 18, 2011 at 7:59am by John*

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