Tuesday

October 21, 2014

October 21, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

A car travels along a straight stretch of road. It proceeds for 11.4 mi at 57 mi/h, then 21.8 mi at 43 mi/h, and finally 30.8 mi at 32.6 mi/h. What is the car’s average velocity during the entire trip?
*Saturday, September 20, 2014 at 9:03pm*

**physics**

A ball is thrown upward at a speed v0 at an angle of 59.0¢ª above the horizontal. It reaches a maximum height of 7.5 m. How high would this ball go if it were thrown straight upward at speed v0?
*Saturday, September 20, 2014 at 8:43pm*

**PHYSICS **

The weight of an object is the same on two different planets. The mass of planet A is only thirty-five percent that of planet B. Find the ratio rA/rB of the radii of the planets.
*Saturday, September 20, 2014 at 7:50pm*

**physics**

A horizontal pipe of uniform cross sectional area A empties into a bucket, filling it at a rate R (unit volume per unit time). Use dimensional analysis to determine the speed,v, of the fluid in the pipe to within a dimensionless multiplicative constant of order 1. What happens...
*Saturday, September 20, 2014 at 7:33pm*

**Physics **

An electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.06 105 m/s to a final velocity of +2.03 106 m/s while traveling a distance of 0.034 m. The electron'...
*Saturday, September 20, 2014 at 6:11pm*

**Physics**

A basketball is shot from an initial height of 2.4 m with an initial speed (v0 = 12 m/s) directed at an angle (35 degrees) above the horizontal. Additional information: Height of the basket is 3.05 m Find how far away the player is standing.
*Saturday, September 20, 2014 at 6:10pm*

**Physics**

In the lab, a relativistic proton has a momentum of 1.00 ×10^-19 kg ∙ m/s and a rest energy of 0.150 nJ. What is the speed of the proton in the lab? (c = 3.00 × 10^8 m/s, mass of proton = 1.67 ×10^-27 kg)
*Saturday, September 20, 2014 at 5:05pm*

**Physics**

A relativistic proton has a momentum of 1.0×10^-17 kg ∙ m/s and a rest energy of 0.15 nJ. What is the kinetic energy of this proton? (c = 3.00 × 108 m/s, mass of proton = 1.67 × 10-27 kg)
*Saturday, September 20, 2014 at 5:00pm*

**Physics**

A particle is moving at 0.75c relative to a lab on Earth. By what percentage is the Newtonian expression for its momentum in error, i.e., how wrong is the classical formula? (The percentage error is the difference between the erroneous and correct values, divided by the ...
*Saturday, September 20, 2014 at 4:58pm*

**Physics**

Assume that a certain city consumes electrical energy at an average rate of 2.0× 10^9 W. What would be the mass change in producing enough energy to keep this city running for 21 weeks?
*Saturday, September 20, 2014 at 4:57pm*

**physics**

A water slide launches a child horizontally above a swimming pool. The distance from the top of the slide to the launch point is 2.76 m. The point where the child is launched horizontally is 0.7 m above the water. How far from the launch point does the child land in the water?
*Saturday, September 20, 2014 at 4:25pm*

**Physics**

A ball moving with a speed of 9 m/s strikes an identical stationary ball such that after the collision the dierection of each ball makes an angle of 30° with the original line of motion. Find the speeds of the two balls after the collision.
*Saturday, September 20, 2014 at 2:10pm*

**physics**

A 25.0-g mass is tied at the end of a 1.50-m long string and is whirled in a horizontal circle. If the string makes an angle of 30.0o with the vertical, what is the frequency of revolution of the mass?
*Saturday, September 20, 2014 at 11:48am*

**physics**

1.) An 8 g bullet is fired into a 9 kg cube of wood, which is at rest, and sticks in it. The cube is free to move and has a speed of 40 cm/sec after impact. Find the initial velocity of the bullet.
*Saturday, September 20, 2014 at 8:50am*

**physics**

2.)A 16 g mass is moving in the +x direction at 30 cm/s while a 4 g mass is moving in the -x direction at 50 cm/s. They collide head on and stick together. Find their velocity after the collision
*Saturday, September 20, 2014 at 8:49am*

**physics**

please somebdy help me solveing this. Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 4.3 m/s2 for 3.3 seconds. It then continues at a constant speed for 14.4 seconds, ...
*Saturday, September 20, 2014 at 5:13am*

**physics**

9) A force in the +x-direction with magnitude F(x) = 18.0 N – (0.530 N/m) x is applied to a 6.00-kg box that is sitting on a frictionless surface. F(x) is the only horizontal force on the box. If the box is initially at rest at x = 0, what is its speed after it has ...
*Saturday, September 20, 2014 at 3:07am*

**physics**

8) A 6.0-kg block initially at rest is pulled to the right along a frictionless, horizontal surface by a constant horizontal force of 12 N. Use the work-kinetic energy theorem to find the block’s speed after it has moved 3.0 m.
*Saturday, September 20, 2014 at 3:03am*

**physics**

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 78 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m
*Saturday, September 20, 2014 at 12:12am*

**physics**

the angle between two forces of 32 AND (neutrons) and 47 N is 36 degrees. Find the magnitude of the resultant force
*Friday, September 19, 2014 at 9:11pm*

**physics**

determine the average acceleration of a slalom skier if she is moving at a velocity of 9.75 m/s[S25E] and then changes her velocity of 8.64 m/s [W35S] in a matter of 0.179sec.
*Friday, September 19, 2014 at 7:21pm*

**physics**

An airplane with a speed of 85.3 m/s is climbing upward at an angle of 45.0 ° with respect to the horizontal. When the plane's altitude is 587 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
*Friday, September 19, 2014 at 7:03pm*

**physics**

A third baseman makes a throw to first base 39.8 m away. The ball leaves his hand with a speed of 43.0 m/s at a height of 1.4 m from the ground and making an angle of 23.7 o with the horizontal. How high will the ball be when it gets to first base?
*Friday, September 19, 2014 at 5:47pm*

**physics**

a ball is thrown vertically upward with an initial velocity of 20 m/s? find the height attain by the ball?
*Friday, September 19, 2014 at 2:48pm*

**physics**

a car cover 100 m in 5th second and 120 m in 8th second during its motion ?calculate the acceleration and distance covered in 20th second?
*Friday, September 19, 2014 at 2:41pm*

**physics- HELP**

An airplane with a speed of 85.3 m/s is climbing upward at an angle of 45.0 ° with respect to the horizontal. When the plane's altitude is 587 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
*Friday, September 19, 2014 at 2:11pm*

**physics**

A particle of mass m1 is kept at x = 0 and another of mass m2 at x = d. When a third particle is kept at x = d/4, it experiences no net gravitational force due to the two particles. Find m2/m1.
*Friday, September 19, 2014 at 8:20am*

**physics**

an object has a weight of 5.10 Newtons at sea level, where the acceleration due to gravity is 9.81 m/s squared. What is the acceleration due to gravity on the object if it is placed in a spaceship 1,000 km above sea level which gravity exerts a force of 3.81 Newtons on the object
*Friday, September 19, 2014 at 8:08am*

**physics**

A ball is thrown horizontally from a building of height 80m. the kine joining the top of the building to the point where it hits the ground makes an angle of 45 degrees with the ground. what is the initial velocity of the ball?
*Friday, September 19, 2014 at 8:03am*

**Physics**

Three balls A, B and C are kept in a straight line. The separation between A and C is 1 m, and B is placed at the midpoint between them. The masses of A, B, C are 100 g, 200 g and 300 g respectively. Find the net gravitational force on (a) A, (b) B, and (c) C.
*Friday, September 19, 2014 at 6:04am*

**physics**

A particle of mass m1 is kept at x = 0 and another of mass m2 at x = d. When a third particle is kept at x = d/4, it experiences no net gravitational force due to the two particles. Find m2/m1.
*Friday, September 19, 2014 at 4:04am*

**physics**

Three balls A, B and C are kept in a straight line. The separation between A and C is 1 m, and B is placed at the midpoint between them. The masses of A, B, C are 100 g, 200 g and 300 g respectively. Find the net gravitational force on (a) A, (b) B, and (c) C.
*Friday, September 19, 2014 at 4:03am*

**physics**

An Olympic long jumper leaves the ground at an angle of 18.7 ° and travels through the air for a horizontal distance of 7.04 m before landing. What is the takeoff speed of the jumper?
*Friday, September 19, 2014 at 3:49am*

**physics**

An airplane with a speed of 85.3 m/s is climbing upward at an angle of 45.0 ° with respect to the horizontal. When the plane's altitude is 587 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
*Friday, September 19, 2014 at 3:00am*

**physics**

A cannon res a cannonball from ground level at an angle of 18 above the horizontal, and the cannonball lands on the ground some distance away. If the muzzle velocity of the cannon remains unchanged, at what angle should the cannon be red so that the cannonball travels ...
*Friday, September 19, 2014 at 1:26am*

**physics**

A non-conducting disk of radius 10cm lies in the x = 0 plane with its center at the origin. The disk is uniformly charged and has a total charge +30ìC. Find Ex on the x-axis at (a) x = 2 cm, (b) x = 5cm, (c) x = 10 cm, and (d) x = 20 cm.
*Friday, September 19, 2014 at 1:26am*

**physics**

A block with mass m = 16.3 kg slides down an inclined plane of slope angle 28.0 ° with a constant velocity. It is then projected up the same plane with an initial speed 1.80 m/s. How far up the incline will the block move before coming to rest?
*Friday, September 19, 2014 at 1:14am*

**physics**

4. A cheetah can run 12 km in 0.9 hrs. Calculate its velocity.
*Friday, September 19, 2014 at 12:34am*

**physics**

Two 2.5 kg physical science textbooks on a bookshelf are 0.25 m apart. What is the magnitude of the gravitational attraction between the books?
*Friday, September 19, 2014 at 12:06am*

**Physics**

An advertisement claims that a particular automobile can "stop on a dime". What net force would actually be necessary to stop an automobile of mass 850kg traveling initially at a speed of 38.0km/h in a distance equal to the diameter of a dime, which is 1.8cm ?
*Friday, September 19, 2014 at 12:05am*

**PHYSICS**

In Case A the mass of each block is 4.0 kg. In Case B the mass of block 1 (the block behind) is 8.0 kg, and the mass of block 2 is 4.0 kg. No frictional force acts on block 1 in either Case A or Case B. However, a kinetic frictional force of 7.8 N does act on block 2 in both ...
*Thursday, September 18, 2014 at 11:29pm*

**Physics**

the acceleration due to gravity on the moon is 1/6 that on earth. For a projectile with an initial velocity of 15m/s upward what would be the maximum height and total time of flight on the moon and on the earth?
*Thursday, September 18, 2014 at 10:31pm*

**Physics**

Calculate the dot product Ā·Ê(where Ê = Ē/E ~ is the unit vector in the direction of Ē ) and plot both Ā and Ê, showing how Ā·Ê is the projection of Ā on Ê. Ā= −4ˆi + 3ˆj Ē= 12...
*Thursday, September 18, 2014 at 10:23pm*

**physics**

A jogger jogs around a circular track with a diameter of 325 m in 10. minutes. What was the jogger's average speed in m/s?
*Thursday, September 18, 2014 at 10:16pm*

**physics**

A boy 14.0m above the ground in a tree throws a ball for his dog, who is standing right below the tree and starts running the instant the ball is thrown. If the boy throws the ball upward at 50.0∘ above the horizontal, at 8.00m/s .
*Thursday, September 18, 2014 at 9:59pm*

**physics**

A baseball is thrown vertically upward with a speed of 17.8 m/s from a height of 1.11 m. How high does the ball rise from its original position?
*Thursday, September 18, 2014 at 9:56pm*

**Physics**

A small plane moving at 207km/hr flying 50.0m above the ground chases a convertible moving at 105km/hr down a straight highway. The plane has a package to drop in the car’s back seat. Assuming the vehicles maintain their speed and altitude and there is no air resistance, ...
*Thursday, September 18, 2014 at 9:23pm*

**Physics**

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor on its way ...
*Thursday, September 18, 2014 at 9:21pm*

**Physics**

A tennis player stands 15.0m from the net. They hit a ball from a height of 2.50m above the ground so that initially it has a horizontal velocity directed parallel to the ground toward the net. What speed does the ball have to have to just clear the net (which is 0.9m high)? ...
*Thursday, September 18, 2014 at 9:20pm*

**physics**

Starting from rest, the car is going 29 ft/s (20 mi/h) at the end of 5.0 s. What is the car's average acceleration in ft/s2?
*Thursday, September 18, 2014 at 9:15pm*

**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*

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