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October 25, 2014

October 25, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics **

A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +7.2 m/s and ax = +4.3 m/s2. The y components of the puck's initial velocity and acceleration are ...
*Thursday, September 18, 2014 at 9:08pm*

**Physics**

What is the centripetal force required to cause a 4000 lb car to go around a curve of 900 ft radius and a speed of 600 miles per hour?
*Thursday, September 18, 2014 at 8:23pm*

**physics**

A barge is hauled along a straight-line section of canal by two horses harnessed to tow ropes and walking along the tow paths on either side of the canal. Each horse pulls with a force of 403 N at an angle of 12.9° with the centerline of the canal. Find the sum of the two ...
*Thursday, September 18, 2014 at 8:09pm*

**Physics**

Two telescopes A and B spot a star. Telescope A reports the position of the star to be in the East 60 degrees above the horizontal line joining A and B. Telescope B, which is 500 km West of telescope A spots the star at 30 degrees above the horizontal line joining A and B. ...
*Thursday, September 18, 2014 at 7:56pm*

**physics**

The speed of all electromagnetic waves in empty space is 3.00 × 108 m/s. What isthe wavelengthofradio waves emit- ted at 97.9 MHz? Answer in units of m
*Thursday, September 18, 2014 at 7:13pm*

**Physics 12**

A sports car is travelling along a highway at a constant velocity of 36 m/s [N] exceeding the speed limit. It passes an unmarked police car parked on the shoulder of the highway. The police car accelerates from rest, 3.0 s after the sports car passed it, at the rate of 6.0 m/...
*Thursday, September 18, 2014 at 7:02pm*

**Physics**

A stone is thrown vertically upward at a speed of 27.00 m/s at time t=0. A second stone is thrown upward with the same speed 2.060 seconds later. At what time are the two stones at the same height?
*Thursday, September 18, 2014 at 6:57pm*

**physics**

A state trooper’s car sends out a radar signal at a frequency of 13.3 GHz. Find the wavelength of this signal. The wave speed is 2.998 × 108 m/s. Answer in units of m
*Thursday, September 18, 2014 at 6:42pm*

**Physics**

1.) What is the acceleration of a car that increases its velocity from 0 to +14m/s in 10s? 2.) What is the acceleration of a car that maintains a constant velocity of - 14m/s for 10s? 3.) Seagulls are often observed dropping clams and other shellfish from a height to the rocks...
*Thursday, September 18, 2014 at 6:30pm*

**physics**

A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force.If the stone leaves with a velocity of 4om/s,what is the value of force?
*Thursday, September 18, 2014 at 5:22pm*

**Physics**

A cat jumps on to a railing at a height of 1.20 m above the ground. He jumps at an angle of 70 degrees relative to the floor. How fast does he have to be moving when he leaves the floor in order for him to make it up to the railing?
*Thursday, September 18, 2014 at 4:55pm*

**Physics**

A basketball player shot a ball. It left his hand at a height of 2.05 m above the court at an angle of 40 degrees relative to horizontal, what initial speed did the ball have if it hit "nothing but net" at the basket 4.50 m away? Assume the rim is 3.05 m above the ...
*Thursday, September 18, 2014 at 4:51pm*

**Physics**

A ball leaves a kicker's foot with a velocity of 23.0 m/s and at an angle of 40 degrees up from the ground, how far did the ball travel before being caught by another player?
*Thursday, September 18, 2014 at 4:46pm*

**Physics**

The swim portion of a triathlon takes place in a river and is an out-and-back course. The river has a steady current that is 0.400 m/s and the athletes swim against the current for 750m before returning and swimming with the current for the second 750m. If one competitor can ...
*Thursday, September 18, 2014 at 3:30pm*

**Physics**

A Car moving North at 9 m/s strikes a stationary car of equal mass. The first car moves off after the collision at an angle of 30 degrees West of North, with a speed of 6 m/s. What is the speed of the second car after the collision? My resources have poor explanation of what ...
*Thursday, September 18, 2014 at 1:44pm*

**physics**

If a 2kg car with a momentum of 12kg m/s collides with a stationary 4kg car, the total momentum after the collision will be?
*Thursday, September 18, 2014 at 12:51pm*

**physics**

A stone is dropped from a height of 10 m on an unknown planet having g = 20 m/s2. Calculate the speed of the stone when it hits the surface of the planet. Also calculate the time it takes to fall through this height
*Thursday, September 18, 2014 at 11:39am*

**physics**

A glider of length 12.7 cm moves on an air track with constant acceleration. A time interval of 0.563 s elapses between the moment when its front end passes a fixed point circled A along the track and the moment when its back end passes this point. Next, a time interval of 1....
*Thursday, September 18, 2014 at 11:20am*

**physics**

a 60kg woman is a passenger in a car that is involved in a crash. she is wearing a seat belt that stops her in 0.1s. if the car gad been travelling at 12m/s before the crash calculate the deceleration and the force on her breastbone due to the seat belt? can you assume that v=...
*Thursday, September 18, 2014 at 10:06am*

**physics**

A circular disc of radius 'r' carries uniform charge distribution of surface charge density 'A'. If the disc lies on the z = 0 plane, with its axis along the z axis, find the electric field at a point P, along the z axis that passes through the center of the ...
*Thursday, September 18, 2014 at 9:05am*

**Physics**

1. A cannon mounted on the back of a ship fires a 50.0 kg cannonball in the horizontal direction at a speed of 150 m/s. If the cannon and ship to which it is firmly attached have a mass of 4.00 x 103 kg and are initially at rest, what is the speed of the ship just after ...
*Thursday, September 18, 2014 at 6:20am*

**physics**

The distance each floor of the office building is 3.0 m. Which table shows the total distance traveled and displacement of the elevator?
*Thursday, September 18, 2014 at 2:05am*

**physics**

A glider of length 12.7 cm moves on an air track with constant acceleration. A time interval of 0.563 s elapses between the moment when its front end passes a fixed point circled A along the track and the moment when its back end passes this point. Next, a time interval of 1....
*Wednesday, September 17, 2014 at 10:09pm*

**physics**

You're sailboarding at 6.1m/s when a wind gust hits, lasting 6.3s accelerating your board at 0.48m/s2 at a 35∘ to your original direction
*Wednesday, September 17, 2014 at 9:59pm*

**Physics- uncertainty**

Eileen, Jackie, and Kathryn needed to find the difference between two angles A1 and A2, that they had drawn on a diagram: B = A1+A2 They then had to find the cosine of B. Jackie measured A1 to be 50° and A2 to be 3°. But their pencil was kind of dull, so ...
*Wednesday, September 17, 2014 at 9:57pm*

**Physics Grade 12**

Heather is sitting on her car at a spotlight. At the instant light turns green, she starts accelerating at 2.2 m/s/s. At the same moment a truck rumbles past her car going a constant speed of 12.2 m/s. Heather is infuriated at being passed by a truck and she keeps accelerating...
*Wednesday, September 17, 2014 at 9:31pm*

**Grade 12 Physics**

Bredan is driving through town at 25m/s and begins to accelerate at a constant rate of -1.0m/s/s. Eventually Brendan comes to a complete stop. A) Represent Brendan's accelerated motion by sketching a velocity-time graph. B) Use the velocity-time graph to determine his ...
*Wednesday, September 17, 2014 at 9:27pm*

**Physics Help Please!!!!**

Human reaction times are worsened by alcohol. How much farther would a drunk driver's car travel before he hits the brakes than a sober driver's car? Assume both cars are initially traveling at 47.0 mi/h, the sober driver takes .33 s and the drunk driver takes 1.0 s to...
*Wednesday, September 17, 2014 at 9:17pm*

**physics**

Which way and by what angle does the accelerometer in the figure deflect under the following conditions?(Figure 1). The cart is moving toward the left with a constant speed of 5.00m/s .
*Wednesday, September 17, 2014 at 9:06pm*

**Physics**

Eileen, Jackie, and Kathryn needed to find the difference between two angles A1 and A2, that they had drawn on a diagram: B = A1+A2 They then had to find the cosine of B. Jackie measured A1 to be 50° and A2 to be 3°. But their pencil was kind of dull, so the lines they...
*Wednesday, September 17, 2014 at 9:01pm*

**physics**

crate weighing 6.90 x 10^3 N is pulled up a 46° incline by a force parallel to the plane. If the coefficient of kinetic friction between the crate and the surface of the plane is 0.750, what is the magnitude of the applied force required to move the crate at a constant ...
*Wednesday, September 17, 2014 at 8:43pm*

**Physics**

On Earth a fit astronaut without a space suit and life support pack can leap straight up and leave the ground with an initial vertical velocity of about v1y = 2.4 m/s and rise to a height of about h = 0.24 m above the point where he first loses contact with the ground. On the ...
*Wednesday, September 17, 2014 at 8:38pm*

**Physics**

state the assumptions that makes up the kinetic theory and evidence to prove sny two of these assumptions
*Wednesday, September 17, 2014 at 8:14pm*

**Physics**

An automobile with an initial speed of 6.12m/s accelerates uniformly at the rate of 4.4 m/s^2.Find the final speed of the car after 4.6 s. Answer in units of m/s
*Wednesday, September 17, 2014 at 7:53pm*

**physics really stuck**

A sprinter starts from rest and accelerates for 5s. He then travels at a constant velocity for 10s. Finally he slows down to a stop in 5s. Draw a distance time graph to represent his motion.
*Wednesday, September 17, 2014 at 6:45pm*

**Physics**

A steel ball is dropped onto a hard floor from a height of 1.80 m and rebounds to a height of 1.64 m. (Assume that the positive direction is upward.) (a) Calculate its velocity just before it strikes the floor. m/s (b) Calculate its velocity just after it leaves the floor on ...
*Wednesday, September 17, 2014 at 6:20pm*

**Physics **

A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 3.00 m/s, and her takeoff point is 1.10 m above the pool. (a) How long are her feet in the air? s (b) What is her highest point above the board? m (c) What is her ...
*Wednesday, September 17, 2014 at 6:18pm*

**physics**

A sprinter starts from rest and accelerates for 5s. He then travels at a constant velocity for 10s. Finally he slows down to a stop in 5s. Draw a distance time graph to represent his motion.
*Wednesday, September 17, 2014 at 4:54pm*

**physics**

You drop a rock from rest out of a window on the top floor of a building, 50.0 m above the ground. When the rock has fallen 3.80 m, your friend throws a second rock straight down from the same window. You notice that both rocks reach the ground at the exact same time. What was...
*Wednesday, September 17, 2014 at 4:12pm*

**physics**

You drop a rock from rest out of a window on the top floor of a building, 50.0 m above the ground. When the rock has fallen 3.80 m, your friend throws a second rock straight down from the same window. You notice that both rocks reach the ground at the exact same time. What was...
*Wednesday, September 17, 2014 at 4:10pm*

**physics first year**

The corners of a square lie on a circle of diameter 0.4 m. Each side of the square has length L. Find L.
*Wednesday, September 17, 2014 at 3:42pm*

**physics**

A car is traveling at 20.8 m/s when the driver sees a dog run out into the street. From the time the driver applies the brakes, it takes 3.58 s for the car to come to a stop. What is the average acceleration during that period?
*Wednesday, September 17, 2014 at 2:43pm*

**Physics**

(c) On Earth a fit astronaut without a space suit and life support pack can leap straight up and leave the ground with an initial vertical velocity of about v1y = 2.4 m/s and rise to a height of about h = 0.24 m above the point where he first loses contact with the ground. On ...
*Wednesday, September 17, 2014 at 1:09pm*

**Physics **

vector A has a magnitude of 45.0 cm and makes an angle of 125 degrees with positive a –axis. What are the x- and y- components of this vector?
*Wednesday, September 17, 2014 at 11:47am*

**PHYSICS PLEASE HELP QUICKLY**

If a person has more mass do they do more work or exert more power? (When walking up the stairs) (Compared to a person with less mass) Am I on the right track? This is what I have so far... The person with most mass does not necessarily do the most work. If two or more people ...
*Wednesday, September 17, 2014 at 11:09am*

**physics**

A uniform ladder, 3 m long and weighing 130 N, placed against a smooth wall, its lower end being 1.80 m from the wall. A 700N man stands on the upper most rung of the ladder located 0.45 m from the upper end of the ladder. a.) What are the vertical and horizontal forces ...
*Wednesday, September 17, 2014 at 10:50am*

**Physics**

A light plane is flying at 25 degrees east of due magnetic north, while ascending at 15 degrees above the horizon; the plane is flying at 40 m/s. Find the planes celocity true to the delta x, delta y, and delta z?
*Wednesday, September 17, 2014 at 9:36am*

**physics**

The resistivity of copper is 1.3×10^-9 ohms. What is the length of a wire whose resistance is 0.25 ohms, diameter 10^-8 m.
*Wednesday, September 17, 2014 at 6:53am*

**Physics**

1. A 0.50 kg ball is moving with a velocity of 8.0 m/s along a horizontal floor. It hits another ball with a mass of 0.80 kg and moving at 10.0 m/s in the opposite direction. If the first ball bounces back with a velocity of 12 m/s, with what velocity and in what direction ...
*Wednesday, September 17, 2014 at 4:32am*

**physics**

A motorist is driving at 20m/s{\rm m/s} when she sees that a traffic light 200m{\rm m} ahead has just turned red. She knows that this light stays red for 15s{\rm s} , and she wants to reach the light just as it turns green again. It takes her 1.0s{\rm s} to step on the brakes ...
*Wednesday, September 17, 2014 at 2:52am*

**physics**

When sand is poured on a rotating disc what happen to its angular velocity ? explain
*Wednesday, September 17, 2014 at 1:00am*

**physics**

A ball starts from rest and rolls down a hill with uniform acceleration, traveling 200m during the second 4.8s of its motion. How far did it travel the first 4.8 seconds
*Tuesday, September 16, 2014 at 11:58pm*

**physics**

A particle is traveling in a straight line at a constant speed of 27.3 m/s. Suddenly, a constant force of 14.3 N acts on it, bringing it to a stop in a distance of 56.4 m.
*Tuesday, September 16, 2014 at 10:38pm*

**College Physics**

An uncharged 3.20-μF capacitor is in series, through a switch, with a 5.55-M Ω resistor and a 36.0- V battery (with negligible internal resistance.) The switch is closed at t = 0 and a current of Ii immediately appears. Determine Ii. How long will it take for the ...
*Tuesday, September 16, 2014 at 10:20pm*

**College Physics**

What is the smallest capacitor needed in a computer power supply in order to supply at least 0.2 A of current for 0.35 s after the power goes off? (DATA: Assume that the resistance of all the components of the computer mother board is 5 Ω and it uses a 5 V supply.)
*Tuesday, September 16, 2014 at 10:19pm*

**College Physics**

After 2.5 time constants, what percentage of the final voltage, emf, is on an initially uncharged capacitor C, charged through a resistance R?
*Tuesday, September 16, 2014 at 10:18pm*

**College Physics**

A heart pacemaker fires 66 times a minute, each time a 27.0–nF capacitor is charged (by a battery in series with a resistor) to 0.632 of its full voltage. What is the value of the resistance?
*Tuesday, September 16, 2014 at 10:17pm*

**College Physics**

A circuit consists of 3 components connected between 2 terminals: A 6 V source, a 90 Ω resistor and a 0.01 F capacitor. The capacitor is initially uncharged. The voltage source is turned on. What is the voltage across the capacitor after a very long time? What is the ...
*Tuesday, September 16, 2014 at 10:16pm*

**College Physics**

What is the internal resistance of a 15.0 V car battery whose terminal voltage drops to 13.40 V when the starter draws 50.1 A? What is the resistance of the starter?
*Tuesday, September 16, 2014 at 10:15pm*

**Physics**

A glider of length 10.1 cm moves on an air track with constant acceleration. A time interval of 0.732 s elapses between the moment when its front end passes a fixed point circled A along the track and the moment when its back end passes this point. Next, a time interval of 1....
*Tuesday, September 16, 2014 at 9:47pm*

**Physics**

1. An 80.0-kg astronaut is floating at rest a distance of 10.0 m from a spaceship when she runs out of oxygen and fuel to power her back to the spaceship. She removes her oxygen tank (3.0 kg) and flings it into space away from the ship with a speed of 15 m/s. At what speed ...
*Tuesday, September 16, 2014 at 9:43pm*

**Physics**

A glider of length 10.1 cm moves on an air track with constant acceleration. A time interval of 0.732 s elapses between the moment when its front end passes a fixed point circled A along the track and the moment when its back end passes this point. Next, a time interval of 1....
*Tuesday, September 16, 2014 at 8:39pm*

**Physics please help**

How do I convert a distance time graph into a velocity time graph. I am given a distance time graph with three curves but i am not sure how to calcualte the area of them to get the velocity time graph.
*Tuesday, September 16, 2014 at 8:12pm*

**Physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 5.56 m/s. The car is a distance d away. The bear is 26.6 m behind the tourist and running at 7.69 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
*Tuesday, September 16, 2014 at 7:16pm*

**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 25 m/s, and the average southward velocity has a magnitude of 32 m/s. Taking northward to be the positive direction, what is the ...
*Tuesday, September 16, 2014 at 7:15pm*

**Physics**

Two cars cover the same distance in a straight line. Car A covers the distance at a constant velocity. Car B starts from rest and maintains a constant acceleration. Both cars cover a distance of 515 m in 229 s. Assume that they are moving in the +x direction. Determine (a) ...
*Tuesday, September 16, 2014 at 7:13pm*

**Physics**

A hot-air balloon is rising upward with a constant speed of 2.53 m/s. When the balloon is 5.82 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?
*Tuesday, September 16, 2014 at 7:12pm*

**physics**

A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 15m/s{\rm m}/{\rm s} when the hand is 2.0m{\rm m} above the ground.How long is the ball in the air before it hits the ground? (The student moves her hand out of ...
*Tuesday, September 16, 2014 at 6:59pm*

**physics**

What physics is involved for a passenger feeling pushed backward into the seat of an airplane when it accelerates along the runway during takeoff?
*Tuesday, September 16, 2014 at 6:52pm*

**Physics**

How do you convert a distance time graph to a velocity time graph. In my first distance time graph, i have 3 curves, two are above the x axis the the middle curve is under the x axis. i am confused on how to change this graph into a velocity time graph since i cant find the ...
*Tuesday, September 16, 2014 at 6:33pm*

**physics**

Question: The swim portion of a triathlon takes place in a river and is an out-and-back course. The river has a steady current that is 0.400m/s and the athletes swim against the current for 750m before turning and swimming with the current for the second 750m. If one ...
*Tuesday, September 16, 2014 at 4:07pm*

**physics**

A block of mass 4.69 kg is hanging from a rope. The tension in the rope is 33.8 N, pulling upward on the block. What is the magnitude and direction of the acceleration of the block?
*Tuesday, September 16, 2014 at 4:00pm*

**physics**

A block of weight 30.1 N is hanging from a rope. The tension in the rope is 18.8 N, pulling upward on the block. What is the magnitude and direction of the acceleration of the block?
*Tuesday, September 16, 2014 at 3:59pm*

**Physics**

A thin straight wire 20 cm in length carries a charge of one microcoulomb. Calculate the electric intensity and potential at a point P on the axis of the wire at a distance of 30 cm from the mid point of the wire.
*Tuesday, September 16, 2014 at 2:43pm*

**Physics**

1. An airplane is flying with the velocity of 459km/h [E40S], however its ground velocity is 498km/h [E24S]. Determine the velocity of the blowing wind. (Use the vector subtraction diagram and geometry to solve this question). I drew a diagram and tried solving this question ...
*Tuesday, September 16, 2014 at 12:03pm*

**physics**

what is the pressure exerted on the ground by a cube which has a weight of 600n and a side of 1m
*Tuesday, September 16, 2014 at 11:36am*

**Physics**

Force acting on conductor when placed in magnetic field from east to west horizontal component is 3.0 and current is 10A
*Tuesday, September 16, 2014 at 11:03am*

**physics**

A person of mass 60 kg is standing on a raft of mass 40kg in a lake. The distance of a person from bank is 30m. If a person starts running towards bank with velocity 10m/s then his distance from bank after 1s will be ?? And explain with diagram and proper steps
*Tuesday, September 16, 2014 at 10:28am*

**physics**

An electric motor runs at a constant rotational frequency of 3000 r/min and has the load of 75 Nm and a 5,0 Nm extra load of friction and gear. The efficiency of the motor is 78%. a) What is the input power of the motor? b) What is the work done by the motor in 24 hours and c...
*Tuesday, September 16, 2014 at 7:29am*

**physics**

A mortar fires a projectile at an angle of of 30 degrees above the horizontal with a velocity of 500 m/s. A soldier spots a tank to be travelling in the direction of the mortar at a constant the rate of 4 m/s. How far should the tank be from the mortar before the mortar is ...
*Tuesday, September 16, 2014 at 6:26am*

**Physics**

a football is kicked in 36 meter per second and 30 degree angle with land.After 1 second,how much it's velocity will ?
*Tuesday, September 16, 2014 at 2:02am*

**Physics**

Assume the length of an organ pipe is L=24cm. You have excited the wave in the tube, and you observe that it has displacement nodes at 4cm, 12cm, and 20cm measured from one end of the pipe. In which harmonic, n, is the air in the pipe oscillating? What is the frequency of the ...
*Tuesday, September 16, 2014 at 12:12am*

**physics**

A tennis ball is struck and departs from the racket horizontally with a speed of 26.4 m/s. The ball hits the court at a horizontal distance of 18.4 from the racket. How far above the court is the tennis ball when it leaves the racket?
*Monday, September 15, 2014 at 11:58pm*

**Physics**

Stephanie serves a volleyball from a height of 0.78 m and gives it a initial velocity of +6.6 m/s straight up. (1): How high will the volleyball go? The acceleration of gravity is 9.81 m/s^2. (2): How long will it take the ball to reach its maximum height? Answer in units of s
*Monday, September 15, 2014 at 11:46pm*

**Physics**

You snap your fingers at the open end of a 1 meter long tube that is closed at the other end. With a microphone at the open end, you determine that it takes 5.8msec between the time you snap your fingers and the echo from the closed end is detected. Based on this info, ...
*Monday, September 15, 2014 at 11:26pm*

**Physics Help**

An airport tram carries passengers between two terminal buildings 500 m apart. The tram starts from rest and accelerations at 1.5 m/s^2 for 20 m. It then travels at a constant velocity for 450 m. Finally, it slows down for 30 m at an acceleration of 1 m/s^2 and comes to rest. ...
*Monday, September 15, 2014 at 10:40pm*

**Physics Help Urgent Please!!!**

A crane is used to lift air conditioning units to the top of a 5-story building. Each story is 3.5 m high. The crane accelerates the units while lifting the units past the first story and then lifts them at a constant velocity past the second through fourth stories. it hen ...
*Monday, September 15, 2014 at 10:39pm*

**Physics **

A block of mass m is given an initial speed of v along a horizontal frictional track. It travels a distance d and comes to a rest. the coefficient of kinetic friction between the block and the track is ....
*Monday, September 15, 2014 at 10:30pm*

**Physics**

A projectile is launched with an initial speed of 80.0m/s at an angle of 40 degrees above the horizontal. The projectile lands on a hillside 3.80s later. Neglect air friction. What is the projectile's velocity at the highest point of its trajectory? What is the straight-...
*Monday, September 15, 2014 at 10:16pm*

**Physics**

A high fountain of water is located at the center of a circular pool as in Figure P1.41. Not wishing to get his feet wet, a student walks around the pool and measures its circumference to be 34.0 m. Next, the student stands at the edge of the pool and uses a protractor to ...
*Monday, September 15, 2014 at 10:01pm*

**Physics **

a 5 kg bucket is lowered by a rope in which there is 30 N of tension. What is the acceleration of the bucket?
*Monday, September 15, 2014 at 9:48pm*

**physics**

Olympic diver Matthew Mitcham springs upward from a diving board that is 3.20 m above the water. He enters the water at a 73.0 degree angle with respect to the water surface, at a speed of 9.36 m/s. Determine the magnitude of his initial velocity. Determine the direction of ...
*Monday, September 15, 2014 at 9:31pm*

**physics**

You stand at the edge of a cliff, holding a ball out over the edge. You give the ball an initial velocity of 7.00 m/s straight up, releasing the ball when it is 17.0 m above ground level (the level of the ground at the base of the cliff). Use g = 10.0 m/s2, and neglect air ...
*Monday, September 15, 2014 at 7:39pm*

**physics**

If a pull of 350 N accelerates a 38-kg child on ice skates at a rate of 7.3 \frac{m}{s^2}, what is the frictional force acting on the skate?
*Monday, September 15, 2014 at 7:37pm*

**Physics**

An attacker at the base of a castle wall 3.95 m high throws a rock straight up with speed 5.00 m/s from a height of 1.50 m above the ground. (a) Will the rock reach the top of the wall? (b) If so, what is its speed at the top? If not, what initial speed must it have to reach ...
*Monday, September 15, 2014 at 7:00pm*

**Physics**

What is the work needed to lift 15kg of water from well 12m deep. Assume the water has a constant upward acceleratin of 0.7m/s^2?
*Monday, September 15, 2014 at 6:12pm*

**Physics**

An electron has an initial speed of 2.24 × 10^5 m/s. If it undergoes an acceleration of 2.2 × 10^14 m/s^2, how long will it take to reach a speed of 5.37 × 10^5 m/s
*Monday, September 15, 2014 at 4:48pm*

**physics**

What is the ball's rebound speed on its first bounce?
*Monday, September 15, 2014 at 4:21pm*

**physics**

A tennis ball is struck and departs from the racket horizontally with a speed of 26.4 m/s. The ball hits the court at a horizontal distance of 18.4 from the racket. How far above the court is the tennis ball when it leaves the racket?
*Monday, September 15, 2014 at 3:38pm*

**Physics**

An industrial die machine is used to stamp out holes in pieces of sheet aluminum. the die strikes the surface of the street of metal at a speed of 10 m/s, passes through the 0.635 cm thick sheet, reverses its direction, and is again moving at 10 m/s as it passes the top ...
*Monday, September 15, 2014 at 3:37pm*

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