Tuesday

October 13, 2015
**physics **

A 3.90 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=14.1N at an angle theta=32.5degrees above the horizontal, as shown. a.) What is the magnitude of the acceleration of the block when the force is applied? b.) What is the ...
*Thursday, October 8, 2015 by Carly*

**Physics **

Three blocks are located on a horizontal frictionless table. They are connected by a massless cord, as shown in the figure, and pulled to the right. The masses of the three blocks are m1 = 38 kg, m2 = 37 kg, and m3 = 17 kg. a.) The pulling force is equal to T3 = 45 N. What is ...
*Thursday, October 8, 2015 by Carly*

**science- physics**

Find the x- and y-components of the vector d⃗ = (6.0 km , 31 ∘ left of +y-axis). I worked it out and got 5.14, 3.09 and apparently it's wrong, I don't know what I did wrong.
*Thursday, October 8, 2015 by Laura*

**Physics**

a soccer ball is kicked and given an initial velocity of 12m/s at an angle of 30 degrees from the ground what's the velocity of the ball in the x axis
*Thursday, October 8, 2015 by Raesha*

**physics**

Gayle runs at a speed of 3.80 m/s and dives on a sled, initially at rest on the top of a frictionless snow covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. ...
*Thursday, October 8, 2015 by jovelyn trocio*

**physics help**

A block of wood experiences a normal force of 32 N from a rough,flat surface.there is a rope tied to the block.the rope is pulled parallel to the surface and the tension in the rope can be increased to 8 N before the block starts to slide. Determine the coefficient of static ...
*Thursday, October 8, 2015 by john*

**physics help**

Three co-linear forces f1=45 N west,f2=63 N east and an unknown force f3 are applied to an object.The resultant force of the three forces is 12 N west determine the magnitude and direction of the force f3 using an algebric calculation(vector addition) answer fres=f1^2 f2^2 12=...
*Thursday, October 8, 2015 by melissa*

**physics**

a aircraft is flying to north with velocity of 350 m/s, aside wind of velocity 100m/s is blowing due to west. what is the resultant velocity ? what is the direction of resultant velocity? how far this aircraft travels during 1 hour?
*Thursday, October 8, 2015 by ne*

**Physics**

A Canon shoots an artillery shell towards a target 4.54 km distant, where it lands at the same level it was shot. It was noted that the elapsed time of the projectile was 27.5 seconds. What was the muzzle velocity of the shell? (there is a picture showing a canon shooting the ...
*Thursday, October 8, 2015 by Ronald*

**Physics**

A soccer ball is kicked with resultant velocity of 22.6 m/s at an angle of 60 degrees. What is the time to Apex, what is the range of the kick? r = 22.6 angle = 60 degrees 1)Vxi=sin(60)(22.6) = 19.57 Vyi=cos(60)(22.6) = 11.3 2)T= Vyf-Vyi/A 0-11.3/-9.81 = 1.1 sec time to apex ...
*Wednesday, October 7, 2015 by Sean*

**Physics**

A train accelerates from rest at a rate of 4m/s^2 for 5 minutes. Then it continues with constant velocity for 10 minutes. Then it slows down to a complete stop while traveling 200 meters. a. What was the total displacement of the train? b. What was the average velocity for the...
*Wednesday, October 7, 2015 by Pdriz*

**Physics**

The 1.1 kg physics book is connected by a string to a 250 g coffee cup. The book is given a push up the slope and released with a speed of 2.9 m/s . The coefficients of friction are μs =0.50 and μk =0.20. What Distance does it travel up the slope? I drew a free body ...
*Wednesday, October 7, 2015 by Zach*

**Physics**

A gun shoots a bullet at 1200 m/s at an angle of 600 above the horizontal. Neglecting air resistance, determine: a.) its time of flight b.) its range
*Wednesday, October 7, 2015 by Peter*

**Physics**

A helicopter is rising vertically at a uniform velocity of 14.7 m/s. When it is 196m from the ground, a ball is projected from it with a horizontal velocity of 8.5 m/s with respect to the helicopter. Calculate: a.) when the ball will reach the ground b.) where it will hit the ...
*Wednesday, October 7, 2015 by Eleanor*

**Physics **

While playing lawn darts with his friend, Jack notices that when he throws a dart up at 60 degrees it travels 11 meters. How high did the dart travel
*Wednesday, October 7, 2015 by Autumn *

**Physics**

A child rides a toboggan down a hill that descends at an angle of 26.6 degrees to the horizontal. The hill is 13.1 meters long. What is the vertical component of the child's displacement? Answer in units of meters.
*Wednesday, October 7, 2015 by Emily Peterson*

**Algebra**

A golf ball is hit with an initial velocity of 140 ft per second at an inclination of 45 degrees to the horizontal. In physics, it is established that the height h of the golf ball is given by the function h(x)=-32x^2/140^2+x, How far does the golf ball travel before it...
*Wednesday, October 7, 2015 by mu*

**physics**

A shopper pushing a cart through a store moves 30.0 m south down one aisle, then makes a 90◦ turn and moves 11.0 m. He then makes another 90◦ turn and moves 22.0 m. What is the magnitude of the smallest possible displacement the shopper could have? You are not ...
*Wednesday, October 7, 2015 by bianca*

**physics**

The steel I-beam in the drawing has a weight of 1.53 × 103 N and is being lifted at a constant velocity. What is the tension in each cable attached to its ends?
*Wednesday, October 7, 2015 by Anonymous*

**Physics**

How much work did the movers do to push a 49.0 kg crate 10.3 m across a rough floor at a speed of 2.9 m/s with a horizontal pushing force of 48 N ?
*Wednesday, October 7, 2015 by Help*

**Physics **

Draw a free body diagram and Apply Newton's 2nd law in both direction. 60 kg chair is pulled along a rough horizontal surface under the action of a 200N force 30 degrees up from horizontal, as shown the acceleration of the chair is 1.5 m/s^2. a) Determine the normal force ...
*Wednesday, October 7, 2015 by Matt*

**Physics**

A hot-air balloon is rising upward with a constant speed of 2.65 m/s. When the balloon is 3.40 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?
*Wednesday, October 7, 2015 by DJ*

**Physics**

In lacrosse, a ball is thrown from a net on the end of stick by rotating the stick and forearm about the elbow. If the angular velocity of the ball about the elbow joint is 26.5 rad / s and the ball is 1.35 m from the elbow joint, what is the velocity of the ball?
*Wednesday, October 7, 2015 by Nico *

**physics**

A skateboarder, with an initial speed of 3.2 m/s , rolls virtually friction free down a straight incline of length 16 m in 3.3 s. At what angle θ is the incline oriented above the horizontal?
*Wednesday, October 7, 2015 by gal*

**physics**

In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 43.7 m/s in a time of 6.50 s. The mass of the car and riders is 3.24 × 103 kg. Find the average net force exerted on the car and riders by the magnets.
*Wednesday, October 7, 2015 by sandra*

**Physics**

A boat moving at 5 mi/h is to cross a river in which the current is flowing at 3 mi/h. In what direction should the boat head to reach a point on the other bank of the river directly opposite the starting point?
*Wednesday, October 7, 2015 by J*

**Physics**

A block of mass 2.30kg is accelerated across a rough surface by a rope passing over a pulley. a) The tension in the rope is 12.4N, and the pulley is 11.2cm above the top of the block. The coefficient of kinetic friction is 0.415. Determine the acceleration of the block when x...
*Wednesday, October 7, 2015 by Presley*

**Physics**

An artillery crew demonstrates its skill by firing a shell at an angle of 69 deg and then lowering the gun barrel and firing a second shell at a smaller angle of 22 deg in such a way that the two shells collide in midair. The initial velocity of the shells is 900 m/s. Find the...
*Wednesday, October 7, 2015 by Madeleine*

**Physics**

A skier leaves the ramp of a ski jump with a velocity of 12.6m/s, 14.5° above the horizontal. The slope below is inclined downwards at 52.2°, and air resistance is negligible. a)Calculate the distance from the ramp to where the jumper lands. b) Calculate the velocity ...
*Wednesday, October 7, 2015 by Madie*

**Physics**

Suppose you have a stack of 9 identical oak planks, each of which have a mass of 8.0 kg. You are required to pull the seventh plank from the stack (counting from the top). If the coefficient of friction between oak and oak is 0.6, how hard do you have to pull?
*Wednesday, October 7, 2015 by Kristin*

**Physics**

A block of mass 8.60 kg is pulled along a horizontal frictionless surface by a cord that exerts a force of 33 N at an angle 29.40 degrees from the horizontal. What is the magnitude of the normal force exerted on the mass by the floor? I solved for the acceleration, which was 3...
*Wednesday, October 7, 2015 by Kristin*

**Physics**

Light in a vacuum is incident on a transparent glass slab. The angle of incidence is 35.1°. The slab is then immersed in a pool of liquid. When the angle of incidence for the light striking the slab is 21.1°, the angle of refraction for the light entering the slab is ...
*Tuesday, October 6, 2015 by Anonymous*

**Physics **

A car with a velocity of 21m/s is accelerated uniformly at arate of 1.6m/s for 6.8s. What is its final velocity?
*Tuesday, October 6, 2015 by Mike*

**Physics **

A ball of mass 0.6 kg, initially at rest, is kicked directly toward a fence from a point 20 m away. The velocity of the ball as it leaves the kicker's foot is 17 m/s at angle of 45 degrees above the horizontal. The top of the fence is 6m high. The ball hits nothing while ...
*Tuesday, October 6, 2015 by Sarah *

**Physics **

A stone is thrown from ground level at 72 m/s. Its speed when it reaches its highest point is 46 m/s. Find the angle, above the horizontal, of the stone's initial velocity. Answer in units of degree
*Tuesday, October 6, 2015 by Jordan *

**Physics**

A baseball is thrown at an angle of 29 degrees relative to the ground at a speed of 24.3 m/s. The ball is caught 51.0463 m from the thrower. The acceleration due to gravity is 9.81 m/s2 How high is the tallest spot in the ball's path? Answer in units of m
*Tuesday, October 6, 2015 by Jessica*

**Physics**

A 0.3 kg tennis ball is travelling west with a speed of 4 m/s and bounces off a wall. After bouncing, the ball is travelling east at 2 m/s. The tennis ball was in contact with the wall for 0.004 seconds. a) What is the initial and final momentum of the ball? b) What is the ...
*Tuesday, October 6, 2015 by Jasmine*

**Physics**

An object is thrown vertically up with a speed of 15m/s. How much time passes before it comes down at 15m/s? (air resistance is negligible)
*Tuesday, October 6, 2015 by Mahmoud*

**Physics**

A football is kicked at ground level with a speed of 15.0 m/s at an angle of 39.0° to the horizontal. How much later does it hit the ground?
*Tuesday, October 6, 2015 by Suhaila*

**Physics**

A 0.3 kg tennis ball is travelling west with a speed of 4 m/s and bounces off a wall. After bouncing, the ball is travelling east at 2 m/s. The tennis ball was in contact with the wall for 0.004 seconds. a) What is the initial and final momentum of the ball? b) What is the ...
*Tuesday, October 6, 2015 by Jasmine*

**physics**

A car travels in a straight line for 4.6 h at a constant speed of 95 km/h . What is its acceleration?
*Tuesday, October 6, 2015 by Anonymous *

**Physics**

A 61 - kg ice skater coasts with no effort for 61 m until she stops. If the coefficient of kinetic friction between her skates and the ice is μk=0.10, how fast was she moving at the start of her coast?
*Tuesday, October 6, 2015 by Angel*

**PHYSICS**

A mass of 100 gm is attached to the end of a rubber string 49 cm long n hving sn area of cross section 20 sqmm. The string is whirled around, horizontally at a cnstnt speed of 40 rps in a crcl of radius 51 cm. Find the young's modulus of rubber.
*Tuesday, October 6, 2015 by sanjay*

**Physics**

Horse canters away from its trainer in a straight line moving 130 m away in 16.0 s. It then turns abruptly and gallops halfway back in 4.3 s? (a) Calculate its average speed. (b) Calculate its average velocity for the entire trip, using "away from the trainer" as the...
*Tuesday, October 6, 2015 by Joshua*

**Physics**

A painter of weight 1000N stands 1.0m from the left-hand end of a uniform plank which is 5.0m long and weighs 800N. The plank is supported by two trestles each 0.5m from the opposite ends. Thre are two upward forces P and Q acting on the plank due to the trestles. By taking ...
*Tuesday, October 6, 2015 by Muhammad Asad*

**Physics**

A car starts from rest on a curve with a radius of 140 m and tangential acceleration of 1.2 m/s^2. Through what angle will the car have traveled when the magnitude of its total acceleration is 2.3 m/s^2?
*Tuesday, October 6, 2015 by Remy*

**University physics**

prove the following rules if True or False using Boolean algebra (a)A+AB = A+B (b)(A+B)(A+C) = A+BC
*Tuesday, October 6, 2015 by Megameno*

**physics**

A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 575 N. As the drawing shows, she is closer to the left cliff than to the right cliff, with the result that the tensions in the left and right sides of the rope are not the ...
*Tuesday, October 6, 2015 by Anonymous*

**Physics**

prove the following rules if true or false using Boolean algebra (a)A+AB = A+B (b)(A+B)(A+C) = A+BC
*Monday, October 5, 2015 by NONEE*

**physics**

A student is skateboarding down a ramp that is 5.79 m long and inclined at 17.6° with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp is 4.22 m/s. Neglect friction and find the speed at the bottom of the ramp.
*Monday, October 5, 2015 by Anonymous*

**physics**

A 57.5-kg runner has a speed of 5.80 m/s at one instant during a long-distance event. (a) What is the runner's kinetic energy at this instant? 967.15 J (b) If he doubles his speed to reach the finish line, by what factor does his kinetic energy change? im having trouble ...
*Monday, October 5, 2015 by zach*

**Physics **

Two 1kg blocks rest on opposite sides of the double inclined plane. One inclined planes makes an angle of 30 degrees and the other an angle of 60 degrees with horizontal. The masses are connected by a light cord passing over a friction less pulley. What is the largest value of...
*Monday, October 5, 2015 by Nicholle*

**Physics**

As an aid in working this problem, consult Interactive Solution 3.62. A ferryboat is traveling in a direction 32.0 ° north of east with a speed of 5.38 m/s relative to the water. A passenger is walking with a velocity of 1.50 m/s due east relative to the boat. What is (a) ...
*Monday, October 5, 2015 by Hannah*

**Physics**

In a marathon race Chad is out in front, running due north at a speed of 3.98 m/s. John is 95 m behind him, running due north at a speed of 4.52 m/s. How long does it take for John to pass Chad?
*Monday, October 5, 2015 by Hannah*

**Physics**

a missile is launched off a jet fighter travelling 300 meters per second. it accelerated with a constant acceleration of 100 meters per second. when it has traveled 5000 meters what will its velocity be?
*Monday, October 5, 2015 by Rachael*

**Physics**

An airplane with a speed of 82.2 m/s is climbing upward at an angle of 71.6 ° with respect to the horizontal. When the plane's altitude is 772 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
*Monday, October 5, 2015 by Hannah*

**physics**

A volleyball is spiked so that it has an initial velocity of 19.9 m/s directed downward at an angle of 55.8 ° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?
*Monday, October 5, 2015 by Hannah*

**Physics**

A race car moving at 35 m/s is uniformly slowed to a stop in 50 s. Find 1) acceleration, and 2) stopping distance.
*Monday, October 5, 2015 by Emily*

**Physics **

Q: A car travels in a straight line for 4.6 h at a constant speed of 95 km/h . What is its acceleration? Answer in units of m/s 2
*Monday, October 5, 2015 by anonymous*

**Physics**

You are standing on the roof of a building 300 m high, and throw a stone upward at 25 m/s. Find the speed of the stone as it strikes the ground.
*Monday, October 5, 2015 by Josh*

**Physics**

A girl hits a ball at an angle of arc tan3/8 to the horizontal from a point O which is O.5m above level ground.The initial speed of the ball is 15m/s at the height of 18m from the girl,find the time taken for the ball to reach the fence and the height of the fence.
*Monday, October 5, 2015 by Enimatique Alogorithm MM*

**physics**

A kayaker paddles at 4.0 m/s in a direction 30° south of west. He then turns and paddles at 3.7 m/s in a direction 20° west of south. I know the formulas but having trouble figuring out the degree of angle. Ax=4(cos30)= 3.4641 Ay=4(sin30)= 2 Bx=3.7(cos20)= 3.477 By=3.7...
*Monday, October 5, 2015 by Lou*

**physics**

1) A T-shirt cannon at a basketball game launches shirts to the upper level at 55 m/s with an angle of 52 degrees. Find the height (dy) of the seats if it takes 4.5 seconds to land in the seats. 2) A soccer ball is kicked on a flat field by the goalie at an initial velocity of...
*Monday, October 5, 2015 by Keke*

**Physics**

Two loudspeakers are mounted on a merry-go-round whose radius is 9.68 m. When stationary, the speakers both play a tone whose frequency is 132 Hz. As the drawing illustrates, they are situated at opposite ends of a diameter. The speed of sound is 343.00 m/s, and the merry-go-...
*Monday, October 5, 2015 by Anonymous*

**Physics**

Two sources of sound are located on the x axis, and each emits power uniformly in all directions. There are no reflections. One source is positioned at the origin and the other at x = +153 m. The source at the origin emits four times as much power as the other source. Where on...
*Monday, October 5, 2015 by Anonymous*

**Physics**

A boy walks 10 m due west and 10m due south.What is the displacement.[2]a girl walks 12m northwards,5m eastwards and 7m southwards.Calculate her total displacement[3]a man walks 5km south and 3km in the direction 60 degree west of south.Calculate his distance from starting point.
*Monday, October 5, 2015 by Moyosoreoluwa*

**Physics**

Two blocks connected by a rope of negligible mass are being dragged by a horizontal force F (Fig. P5.45). Suppose that F = 75.0 N, m1 = 14.0 kg, m2 = 19.0 kg, and the coefficient of kinetic friction between each block and the surface is 0.098. a)Determine the tension T. b)...
*Monday, October 5, 2015 by Ali *

**Physics**

A 15.0-g metal cylinder is placed on a turntable, with its center 73 cm from the turntable's center. The coefficient of static friction between the cylinder and the turntable's surface is μs = 0.79. A thin, massless string of length 73 cm connects the center of ...
*Monday, October 5, 2015 by Erin*

**physics**

In lacrosse, a ball is thrown from a net on the end of stick by rotating the stick and forearm about the elbow. If the angular velocity of the ball about the elbow joint is 30.3 rad / s and the ball is 1.35 m from the elbow joint, what is the velocity of the ball?
*Monday, October 5, 2015 by jordan*

**Physics**

The following circuits represent a logarithm amplifier The output voltage for a log amp with a diode can be determined by the formula below Vout = -(.025V)ln(Vin/IR*R1) , the ln is the natural logarithm of a number. Calculate in a table and sketch the output voltage versus the...
*Monday, October 5, 2015 by Megameno*

**physics**

Two capacitors of capacities c1=3uf and c2=6uf arranged in series are connected in a parallel with third capacitor c3=4uf. The arrangement is connected to a 6.0 V battery. Calculate the total energy stored in the capacitors.
*Monday, October 5, 2015 by shahbaz ahmad pala*

**Physics**

Differentiate between an integrator and differentiator
*Monday, October 5, 2015 by NONEE*

**Physics **

Let your car have a mass of 825 kg. Your car is moving at a speed of 3.08 m/s when it strikes a parked car and stops in 0.21 s. What force did the parked car exert on it to stop it that quickly?
*Monday, October 5, 2015 by Michael*

**Physics**

An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of +16 m/s and measures a time of 23.2 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due to ...
*Monday, October 5, 2015 by Ramen Noods*

**PHYSICS**

A 1420-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16930 N on the submarine, as well as a downward resistive force of 1030 N. What is the submarine's acceleration?
*Monday, October 5, 2015 by Anonymous*

**Physics**

A plane head north with an airspeed of 420 km/h. However, relative to the ground, it travels in a direction 7.0 west of north. if the wind's direction is towards the southwest (45.0 south of west), what is the wind speed?
*Sunday, October 4, 2015 by JHM*

**PHYSICS**

Three forces act on a moving object. One force has a magnitude of 81.2 N and is directed due north. Another has a magnitude of 47.9 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object continues to move with ...
*Sunday, October 4, 2015 by Anonymous*

**PHYSICS**

A 103-kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is μk = 0.555. (a) What is the magnitude of the frictional force? (b) If the player comes to rest after 1.05 s, what is his initial speed?
*Sunday, October 4, 2015 by Anonymous*

**PHYSICS**

A car is traveling up a hill that is inclined at an angle θ above the horizontal. Determine the ratio of the magnitude of the normal force to the weight of the car when (a) θ = 15o and (b) θ = 32o.
*Sunday, October 4, 2015 by Anonymous*

**PHYSICS**

A 50.5-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.624 and 0.364, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?
*Sunday, October 4, 2015 by Anonymous*

**physics**

a rocket launched off a cliff is represented by the equation h(t)= -16t^2+100t+140. when will this rocket reach 200 feet? I tried to factor it, i'm confused.
*Sunday, October 4, 2015 by angel*

**physics**

A rock is dropped from a tree of height 22 m into a lake (depth 4.0 m) below. After entering the water, the rock floats gently down through the water at a constant speed of 1.4 m/s to the bottom of the lake. What is the total elapsed time?
*Sunday, October 4, 2015 by julia*

**Physics**

A small plane aims to fly directly east at 120. km/h, but a headwind is blowing 50. km/h at 22 degrees south of west, slowing the plane down. Find the plane's actual ground speed and direction.
*Sunday, October 4, 2015 by brooklyn*

**Physics**

If you kick a football at 64.7 m/s at 49 degrees? a) How long is the ball in the air? b) Where does the ball land horizontally? c) What is the balls vertical acceleration at the top of its flight?
*Sunday, October 4, 2015 by Ghazi*

**Physics**

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.890 m/s at an angle of 36.0° above the table, and it lands on the magazine 0.0660 s after leaving the table. Ignore air resistance. How thick is the magazine? ...
*Sunday, October 4, 2015 by Hannah*

**PHYSICS**

Two skaters, a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. The mass of the man is 88 kg, and the mass of the woman is 58 kg. The woman pushes on the man with a force of 56 N due east. Determine the acceleration (magnitude ...
*Sunday, October 4, 2015 by Anonymous*

**Physics**

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 660 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.027 m below the center. What is the horizontal distance between the end of the rifle...
*Sunday, October 4, 2015 by Hannah*

**Physics**

A quarterback throws a pass at an angle of 40 degrees above the horizontal with an initial speed of 20 m/s. The ball is caught by the receiver 2.55 seconds later. Determine horizontal velocity, vertical initial velocity, the distance ball was thrown, and maximum height of the ...
*Sunday, October 4, 2015 by Jose Luis*

**PHYSICS**

The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of time with the ...
*Sunday, October 4, 2015 by Anonymous*

**Physics**

A sports car skids to a stop, leaving skid marks 290 m long. If the coefficient of kinetic friction between tires and pavement is 0.80, how fast was the car going before the skid?
*Sunday, October 4, 2015 by Luis*

**Physics**

A person 1.90 m tall walks on a horizontal icy surface. The coefficient of friction between the surface of the ice and the person's shoe sole is μ = 0.33 and the length of the person's legs are 1/2 of the person's height. Determine the maximum step length the ...
*Sunday, October 4, 2015 by Jacob*

**physics**

A curved road is banked at an angle such that friction is not necessary for a car to stay on the road. a 2500 kg car is traveling at a speed of 25 ms and the road has a radius of curvature equal to 40 m. calculate the magnitude of force that the road exerts on the car? I think...
*Sunday, October 4, 2015 by amelia*

**physics**

I need help understanding these, please. Thanks! 1. A 2 kg body moves with constant velocity when a force of 10 N is applied. What is the coefficient of kinetic friction between the table and the body? (Would I use F=m*g for this??) 2. Which of the following statements is ...
*Sunday, October 4, 2015 by Ellie*

**Physics **

An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man if a) the elevator is stationary? b) the elevator accelerates upward at 2 m/s2? c) the elevator rises with constant velocity 4 m/s? d) while rising, the elevator decelerates at 1.5 m...
*Sunday, October 4, 2015 by John Scott*

**Physics **

A boy throws a ball straight up into the air so that it leaves his hand at 11 m/s. If the ball has mass 0.15 kg and the boy's arm moved through 1.5 m as he threw the ball, then what average force did he exert on the ball? I'm completely confused. I looked over my notes...
*Sunday, October 4, 2015 by John Scott*

**Physics**

A stone is thrown up and returns to it's starting point 6 second later. Find the stone's initial speed.
*Sunday, October 4, 2015 by Mike*

**Physics**

A plane can travel with a speed of 80 mi/hr with respect to the air. Determine the resultant velocity of the plane (magnitude only) if it encounters a: 10 mi/hr cross wind; 60 mi/hr cross wind; 10 mi/hr tailwind; 10 mi/hr headwind. I have no idea what equation to use to solve ...
*Sunday, October 4, 2015 by Oleg*

**physics**

A 3000-kg truck needs a propeling steady force of 1400 N to travel at a speed of 40 mpg. What is the MPG for the truck if its engine efficiency is 27%? Heat released from one gallon=136,500,000 J and 1 m= 1609 m.
*Sunday, October 4, 2015 by Penny*

**Physics**

A quarterback throws a pass at an angle of 40 degrees above the horizontal with an initial speed of 20 m/s. The ball is caught by the receiver 2.55 seconds later. Determine horizontal velocity, vertical initial velocity, the distance ball was thrown, and maximum height of the ...
*Sunday, October 4, 2015 by JoseF3*

**Physics**

A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.4 m/s and the tension in the rope is T = 15.5 N. A peg is placed 4/5 of the way down the pendulum’...
*Sunday, October 4, 2015 by Hannah*