Wednesday

September 28, 2016
**physics**

You normally drive on the free way between kidapawan and davao at an average speed of 105km/hr (65mi/hr) and the trip takes 2hr and 20minutes on a friday afternoon,however heavy traffic slows you down and you drive the same distance an average speed of only 70km/hr (50mi/hr. ...

*Wednesday, September 14, 2016 by joan lozano*

**mathematical physics**

Out of 90 applicants for a job, 60 people get selected after the interview. If five applicants are selected at random,calculate the probability that 2 will get selected.

*Wednesday, September 14, 2016 by gourav bhardwaj*

**physics**

a rock is thrown straight up and reaches a height at 10 meters. 1.how long was the rock in the air 2.what is the initial vvelocity of the rock?

*Tuesday, September 13, 2016 by gheng*

**mathematical physics**

For a scaler field ϕ(x, y, z) = x^n+y^n+z^n, show that (🔻ϕ ).r = nϕ , where n is a non-zero real constant.

*Tuesday, September 13, 2016 by gourav bhardwaj*

**mathematical physics**

A metal sheet has ,on the average , 5 defects per 1.0 m^2. Assuming a poisson distribution , calculate the probability that a 1.5 m^2 piece of the metal sheet will have at least 4 defects.

*Tuesday, September 13, 2016 by gourav bhardwaj*

**mathematical physics**

An unbiased coin is tossed three times. If A is the event that a head appears on each of the first two tosses , B is the event that a tail occurs on the third toss and C is the event that exactly two tails appears in the three tosses, show that : i) Event A and B are ...

*Tuesday, September 13, 2016 by gourav bhardwaj*

**Science-Physics **

Why is it easier to float in the Dead sea than the Caribbean sea?

*Tuesday, September 13, 2016 by Anonymous*

**Physics **

A car is driving at a speed of 66.0 km/h toward an intersection just as the light changes from green to yellow. The driver has a reaction time of 0.750 s and the magnitude of the braking acceleration of the car is 5.50 m/s2.Find the minimum distance the car travels before ...

*Tuesday, September 13, 2016 by Alison Zook*

**Physics **

I'm having Sig fig troubles. What would 0.98*2040 be using Sig fig rules???

*Tuesday, September 13, 2016 by Stephen *

**Physics**

A drag racer starts her car from rest and accelerates at 4.8 m/s 2 for the entire distance of 409 m. How long did it take the car to travel this distance?

*Tuesday, September 13, 2016 by James*

**physics**

Sally travels by car from one city to another. She drives for 29.0 min at 63.0 km/h, 37.0 min at 32.0 km/h, and 14.0 min at 26.0 km/h, and she spends 14.0 min eating lunch and buying gas.

*Tuesday, September 13, 2016 by will*

**Physics**

An astronaut exerts a 190-N force pushing a beam into place on the International Space Station. The beam accelerates at 0.14 m/s2 .Determine the mass

*Tuesday, September 13, 2016 by Anonymous*

**Physics**

two pith balls each of mass 2 mg are suspended by very light thread of 20 cm long from a common pt. each ball has the same charge so that the threads form angles of 30° with the vertical. what is the charge on each ball?

*Tuesday, September 13, 2016 by Anonym*

**Physics**

Two pith balls each of mass 2 mg are suspended by very light thread of 20 cm long from a common pt. each ball has the same charge so that the threads form angles of 30° with the vertical. what is the charge on each ball?

*Tuesday, September 13, 2016 by Aayushi*

**Physics**

Two particles A and B,are of equal mass,and moving towards each other,with speeds of 3m/sand 2m/s respectively and collide.Particle B then strikes a plane surface,which is perpendicular to its direction of motion and the rebounce.If the coefficient of restitution between the ...

*Tuesday, September 13, 2016 by Mercypraise*

**Physics **

A body is moving with uniform acceleration describe 40m in first 5second and 65m in next 5second. It's initial velocity will be?

*Tuesday, September 13, 2016 by Ak!@#$%^&a *

**mathematical physics**

An unbiased coin is tossed three times. If A is the event that a head appears on each of the first two tosses , B is the event that a tail occurs on the third toss and C is the event that exactly two tails appears in the three tosses, show that : i) Event A and B are ...

*Tuesday, September 13, 2016 by gourav bhardwaj*

**physics**

a ball is thrown verrically upward. the speed of ball was 30m/s when it had reached ½ of its maximum height. 1) how high did the ball rise 2) find the velocity and acceleration 1 second after it is thrown

*Tuesday, September 13, 2016 by ayush*

**mathematical physics**

A metal sheet has ,on the average , 5 defects per 1.0 m^2. Assuming a poisson distribution , calculate the probability that a 1.5 m^2 piece of the metal sheet will have at least 4 defects.

*Tuesday, September 13, 2016 by gourav bhardwaj*

**mathematical physics**

Out of 90 applicants for a job, 60 people get selected after the interview. If five applicants are selected at random,calculate the probability that 2 will get selected.

*Tuesday, September 13, 2016 by gourav bhardwaj*

**mathematical physics**

Obtain the derivative and the unit tangent vector for a vector function a(t) = t i^+e^t^2 j^+ sin2t k^

*Tuesday, September 13, 2016 by gourav bhardwaj*

**science,physics**

a 5kg bomb exploded into two fragments .If one fragment with 3 kg moves in a direction with 5m/s then what is the velocity of the second fragment of mass 2kg

*Tuesday, September 13, 2016 by jhon*

**Physics**

If it takes 5 seconds for the baseball to fall, how far from the tower will it land? I used vertical distance formula dy=1/2(g)t^2 and got 122.5 but its one of the answers in the multiple choice. Please help.

*Tuesday, September 13, 2016 by Em*

**Physics **

A fire hose held near the ground shoots water at a speed of 13m/s.At what angle should the nozzle point in order that the water land 16m away?Why are there two different angles? Please show the all the work thank you very much.

*Tuesday, September 13, 2016 by Arman*

**Physics **

A ball thrown horizontally at 21m/s from the roof of a building lands 24m from the base of the building. Now high is the building?

*Tuesday, September 13, 2016 by Arman*

**AP physics **

A store is dropped from the top of a Cliff. It is seen to hit the ground below after 3.55s.How high is the cliff?

*Monday, September 12, 2016 by Susana *

**AP physics **

Two locomotives approach each other on parallel tracks. Each has and average spend of 150 km/h with respect to the ground. If they are initialy 8.5 km apart, how Long will it be before they reach each other?

*Monday, September 12, 2016 by Susana *

**Physics**

Each cubic centimeter of silver has a mass of 10.5 g. (a) What is the mass of 62.9 cm3 of silver? (b) When placed on a beam balance, the 62.9-cm3 piece of silver has a mass of only 612 g. What volume of the piece is hollow?

*Monday, September 12, 2016 by Anonymous*

**Physics**

Each cubic centimeter of silver has a mass of 10.5 g. (a) What is the mass of 62.9 cm3 of silver? (b) When placed on a beam balance, the 62.9-cm3 piece of silver has a mass of only 612 g. What volume of the piece is hollow?

*Monday, September 12, 2016 by Big Homie*

**Physics **

A child throws a rock vertically at 15.0 m/s. It lands on his roof 3.0m above the ground. How long was the rock in the air and what was its speed just before it hit the roof?

*Monday, September 12, 2016 by Vanessa*

**Physics**

If the sled in the the previous question weighs 530 newtons and the horse pulls it with a force of 140 newtons across level ground at a constant speed, what is the magnitude of the force of friction between the sled rails and the snow? Hide hint for Question 8 Hint 1: Remember...

*Monday, September 12, 2016 by Adam*

**Physics**

The captain of a plane wishes to proceed due west. The cruising speed of the plane is 255 m/s relative to the air. A weather report indicates that a 39.0-m/s wind is blowing from the south to the north. In what direction, measured with respect to due west, should the pilot ...

*Monday, September 12, 2016 by Shelby *

**Physics**

In the absence of air resistance, a projectile is launched from and returns to ground level. It follows a trajectory similar to that shown in Figure 3.10 and has a range of 29 m. Suppose the launch speed is doubled, and the projectile is fired at the same angle above the ...

*Monday, September 12, 2016 by Shelby *

**Physics**

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 640 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.028 m below the center. What is the horizontal distance between the end of the rifle...

*Monday, September 12, 2016 by Shelby *

**Physics**

A bird watcher meanders through the woods, walking 1.13 km due east, 1.01 km due south, and 3.95 km in a direction 49.8 ° north of west. The time required for this trip is 1.965 h. Determine the magnitudes of the bird watcher's (a) displacement and (b) average velocity.

*Monday, September 12, 2016 by Shelby *

**Physics**

A VW Beetle goes from 0 to 46.0 mi/h with an acceleration of +2.35 m/s2. (a) How much time does it take for the Beetle to reach this speed? (b) A top-fuel dragster can go from 0 to 46.0 mi/h in 0.750 s. Find the acceleration (in m/s2) of the dragster.

*Monday, September 12, 2016 by Shelby *

**physics**

Does drift velocity depend upon the area of conductor?

*Monday, September 12, 2016 by prashant*

**physics**

can someone else me solve this equation? E=mgh

*Monday, September 12, 2016 by sal*

**physics**

a 5kg bomb exploded into two fragments. if one fragment with 3kg moves in a direction with 5m/s then what is the velocity of the send fragment of mass 2kg?

*Monday, September 12, 2016 by Lakshmanarayana*

** physics**

What is the resultant displacement when a ship sail 200km north and then 150km west

*Monday, September 12, 2016 by Daniel*

**Physics **

A box is dragged across a floor by a rope which makes an angel 45 degree with the horizontal the tension in the rope is 100N ,while the box is dragged 10m the work done is?

*Monday, September 12, 2016 by Sangita*

**physics**

a force of 20 N acts toward the east. Another force of 27 N acts at the same point toward the west. what is the magnitude and direction of a third force that produces a resultant of 10 N toward the east?

*Monday, September 12, 2016 by Anonymous*

**Physics **

A car with an initial velocity of 8 m/s experiences a constant acceleration for 3 sec, after which the velocity is 17 m/s. a) What was the acceleration? b) How far did the car travel during that time interval? What would the equations be for each of these questions?

*Monday, September 12, 2016 by Anonymous *

**Physics**

When a jam occurs, the vehicle quickly piled up. For example, in highway vehicles drive at a rate of 80 km/h and the distance between the vehicles 80m. The distance here is between the rear end of the vehicle in front to the front end of the rear vehicle. Suppose the average ...

*Monday, September 12, 2016 by Husna*

**Physics**

A ball dropped without initial velocity at the edge of a cliff with a height of 24m. from the base of the cliff at the same time, the second ball is thrown vertically upward, with an initial velocity V_0. V_0 is exactly the same speed of the first ball when it reaches the base...

*Monday, September 12, 2016 by Husna*

**Physics: Conversions**

Naval Question: MIDN Rabbit recently completed the NAVY PFA last Friday. During the course of CRUSHING the run and setting a new PR of 7:55, he/she performed a total of 1.1 million ft-Ibf of work. 1). Convert 1.1 million ft-Ibf of work to BTUs 2). Assume MIDN Rabbit's ...

*Sunday, September 11, 2016 by John*

**Physics **

A car with an initial velocity of 8 m/s experiences a constant acceleration for 3 sec, after which the velocity is 17 m/s. a) What was the acceleration? b) How far did the car travel during that time interval? What would the equations be for each of these questions?

*Sunday, September 11, 2016 by Anonymous *

**Physics **

A speeder passes a parked police car at 30 m/s and continues on, obliviously maintaining a constant velocity. At that instant, the police car starts from rest with a uniform acceleration of 2.44 m/s2. a) How much time passes before the officer catches up to the speeder? b) How...

*Sunday, September 11, 2016 by Anonymous *

**Physics**

A photographer in a helicopter ascending vertically at a constant rate of 1.3 m/s accidentally drops a camera out the window when the helicopter is 40.0 m above the ground. How long will it take the camera to reach the ground? Which equation should I use? a) Y=Yo + Vo(t) + (1/...

*Sunday, September 11, 2016 by Bex*

**physics**

You are driving your car along a country road at a speed of 21.5 m/s. As you come over the crest of a hill, you notice a farm tractor 35.7 m ahead of you on the road, moving in the same direction as you at a speed of 10.0 m/s. You immediately slam on your brakes and slow down ...

*Sunday, September 11, 2016 by Anonymous*

**physics**

A soccer ball is kicked with an initial horizontal velocity of 16 m/s and an initial vertical velocity of 17 m/s. 1) What is the initial speed of the ball? 2) What is the initial angle θθ of the ball with respect to the ground? 3) What is the maximum height the ball ...

*Sunday, September 11, 2016 by Hallie*

**physics**

A soccer ball is kicked with an initial horizontal velocity of 16 m/s and an initial vertical velocity of 17 m/s. 3) What is the maximum height the ball goes above the ground? 4) How far from where it was kicked will the ball land?

*Sunday, September 11, 2016 by Hallie*

**physics**

the velocity of a body moving with uniform acceleration is 10m/s at a particular instant. its velocity after 5 sec is 20m/s. what was the velocity of the body 3 sec before that instant?

*Sunday, September 11, 2016 by Anonymous*

**physics**

A cylindrical glass is 15cm long its diameter is 7cm. what volume of milk can be poured in it without spilling

*Sunday, September 11, 2016 by vaibhav*

**physics**

What is the magnitude of tension on each cord 18 degrees 4.75 kg

*Sunday, September 11, 2016 by love*

**Physics**

A body is projected with an initial velocity 300m\s at an angle 60 with the vertical;determine :1.the velocity at the maximum height 2.The maximum height reached

*Sunday, September 11, 2016 by christian*

**Physics - URGENT **

Water moves through a constricted pipe in steady, ideal flow. At the lower point shown in the figure below, the pressure is 1.70 ✕ 105 Pa and the pipe radius is 2.50 cm. At the higher point located at y = 2.50 m, the pressure is 1.21 ✕ 105 Pa and the pipe radius ...

*Sunday, September 11, 2016 by Physics - URGENT *

**physics **

A particle is traveling counterclockwise in a circle of radius r = 2.30 m. At some instant in time, the particle is located by the angular coordinate α = 24.0°, the total acceleration has a magnitude of a = 15.0 m/s2 and is directed at an angle β = 20.0° with...

*Saturday, September 10, 2016 by bob*

**Physics**

Once all of the passengers aboard it a train leaves the station and it takes 30 minutes to reach its maximum velocity once at maximum velocity train travels the next 6.30×10^2 km for the next 12.6 hours what is the acceleration of the train leaving the station. Do we ...

*Saturday, September 10, 2016 by Luna*

**physics**

how much output I can get if a coil having 100000 turns moves pass a strong 3000 gauss neodymium magnet with 10 m/s velocity only once a time?

*Saturday, September 10, 2016 by vikram*

**physics**

how many meters does a car travel in 3 seconds at 75 mph

*Friday, September 9, 2016 by jw*

**Physics **

If a basketball player has a vertical leap of 1.29 m , then what is his takeoff speed and his hang time ( total time to move upwards to the peak and then return to the ground ) ?

*Friday, September 9, 2016 by Chloe *

**Physics**

The observation deck of tall skyscraper is 370. m above the time required for a penny to free fall from the deck to the street below and its velocity when it reaches the ground . Plzz help I know the t= .869 and the v= 85.2 and thank u :) have a good day plz answer this is a ...

*Friday, September 9, 2016 by Dyla*

**Physics (Help Plz)**

Ilya and Anya each can run at a speed of 8.00 mph and walk at a speed of 3.50 mph . They set off together on a route of length 5.00 miles . Anya walks half of the distance and runs the other half, while Ilya walks half of the time and runs the other half. 1) Find Anya's ...

*Friday, September 9, 2016 by Ashley*

**Physics**

Two forces of magnitudes 6.0 N and 4.0 N act on a 3.2 kg body. What is the acceleration produced when these forces are acting in the same direction? What is the acceleration produced when these forces are oppositely directed?

*Friday, September 9, 2016 by Jenny*

**Physics**

What acceleration is imparted to a football when the player kicked it with a force of 25 N? Mass of a football = 0.40 kg.

*Friday, September 9, 2016 by Jenny*

**Physics **

A car goes North at 55mi/hr for 1.3 hrs. It then goes East at 65mi/hr for 45 min. What is the total distance travelled, total displacement,average speed and average velocity of the car?

*Friday, September 9, 2016 by Erica*

**Physics **

Superman lived on Krypton where the acceleration due to gravity is 23.6 m/s2. If a woman falls from a building that is 88.3 m tall, how long does he have to save her before she hits the ground? Givens: Unknown: Substitute: Solve:

*Friday, September 9, 2016 by Anonymous*

**PHYSICS**

a violin string emits sound of freqency 510Hz.how for will be the sound waves reach when string completes 250vibration?the velocity of sound is 340M/S.

*Friday, September 9, 2016 by value*

**Physics**

A baseball is hit so that it travels straight upward after being struck by the bat. A fanobserves that it takes 3 seconds for the ball to reach it's maximum height. Find the balls initial velocity and the height it reaches. My teacher gave me a similar problem to this but ...

*Friday, September 9, 2016 by Ri*

**Physics **

A baseball is his so that a travel straight upward after being struck by the bat. A fat observes that it takes three seconds for the ball to reach its maximum height. Find the balls initial velocity and the height it reaches. my professor showed a similar problem to this but ...

*Friday, September 9, 2016 by Lauren*

**Physics **

A gun of mass 20 kg fires a bulllet of mass 50 g with a velocity of 200 ms. Calculate the velocity of the recoil of the gun

*Thursday, September 8, 2016 by Numerical *

**Physics**

The three displacement vectors have a magnitudes of a= 5.00 meters, b= 5.00 meters, and c= 4.00 meters. Find the resultant magnitude and Direction angle of the three vectors by names of the component method. Express the directional angle as an angle above the positive or ...

*Thursday, September 8, 2016 by Anonymous*

**Physics**

A jet plane is launched from a catapult on an aircraft carrier. In 2.0 s it reaches a speed of 42 meters a second at the end of the catapult. Assuming the acceleration is constant, how far did it travel during those 2 seconds?

*Thursday, September 8, 2016 by Merlin*

**Physics**

The sun is 30 ∘ above the horizon. It makes a 54 m -long shadow of a tall tree.

*Thursday, September 8, 2016 by ED*

**physics**

a sportsman develops a maximum speed of 12 m/s when he is swimming in a pool. Calculate the time interval that is required to travel a distance of 25 m.

*Thursday, September 8, 2016 by annonymus*

**Physics**

How far does a runner travel if they maintain a speed of 8.5 m/s for 240 s?

*Thursday, September 8, 2016 by Student*

**Physics **

what must be the net force if a 19.9 kg mass accelerates to the left at a rate of 2.2m/s^2?

*Thursday, September 8, 2016 by Bridget *

**physics**

A shell leaves a mortar with a muzzle velocity of 500 ft/s directed upward at 60 degrees with the horizontal. Determine the position of the shell and its resultant velocity 20 s after firing. how high will it rise?

*Thursday, September 8, 2016 by jed*

**Physics**

During the first 50 s a truck traveled at constant speed of 25 m/s. Find the distance that it traveled.

*Thursday, September 8, 2016 by Student*

**Physics**

A rabbit can cover a distance of 80 m in 5 s. What is the speed of the rabbit?

*Thursday, September 8, 2016 by Student*

**physics**

In college softball, the distance from the pitcher's mound to the batter is 43 feet. Part A If the ball leaves the bat at 105 mph , how much time elapses between the hit and the ball reaching the pitcher? Express your answer to two significant figures and include the ...

*Thursday, September 8, 2016 by Anonymous*

**Physics Ap**

A flower pot falls from a windsill 30 meters above the sidewalk. How fast is it going when it hits the ground? How long does it take to reach the ground? How fast would it be going if it was thrown down at 8m/s instead?

*Thursday, September 8, 2016 by Jake*

**physics**

In prepairing a tea 600g of water at 90 degrees celsius is poured into a 200g China pot.Cpot=840 J/kg degrees celsius at 20 degrees celsius. What is the final temperature of water?

*Thursday, September 8, 2016 by liza*

**Physics**

I need some help on doing the process of the following problem: A body falls freely from rest and half of his fall is done in the last second. Calculate the total time of the fall. I know that the time on the first path is t-1. Also that I can equalize distance equations to ...

*Thursday, September 8, 2016 by Amelie*

**physics**

a man walks 5 miles due east and 7 miles southeast. how far, and in what direction is he from his starting point?

*Thursday, September 8, 2016 by faz*

**physics**

a small piece of wire bent into L shape with upright and horizontal positiions of equal lengths, is placed with horizontal position along axis of concave mirrror whose radius of curvature is 10cm. If bend is 20cm from pole of mirror, then ratio of lengths of images of upright ...

*Thursday, September 8, 2016 by Samm*

**Physics**

If a bullet is shot at velocity of 400 m/s and hits a copper plate, how much heat will be produced?

*Thursday, September 8, 2016 by Minhazul*

**physics**

Two cars are traveling on a desert road between three consecutive poles, as shown in the figure. After 5.2 s, they are side by side at the next telephone pole. The distance between the poles is 74.0 m.

*Thursday, September 8, 2016 by anoynymus*

**Physics**

Thank you so much Mr. Bob Pursley for answer to one of my two questions. Can you please provide me with this answer. My exam is ahead. QUESTION: A rocket is ignited and gone up. After that it returns to the ground. How to draw a displacement time of the same ?

*Thursday, September 8, 2016 by Sagnik*

**Physics**

A rocket of mass 50 kg is launched vertically. Its fuel is being burnt at a rate of 2 kg s-1 and its exhaust gas is being forced out with a speed of 1000 m s-1. What is the initial acceleration of the rocket?

*Thursday, September 8, 2016 by okw*

**Physics**

Calculate the skid-to-stop of a car travelling oa a road at 100km/h with a coefficient of friction of 0.68.

*Thursday, September 8, 2016 by skid*

**Physics**

A body is partially submerged in a liquid. How to find the value of v/V where V=volume of the solid and v=volume of the submerged part ?

*Thursday, September 8, 2016 by Sagnik*

**Physics**

A rocket is ignited and gone up. After that it returns to the ground. How to draw a displacement time of the same ?

*Thursday, September 8, 2016 by Sagnik*

**PHYSICS**

Two tugboats are towing as barge. Each exerts a force of 5.0 tons and the angle between two ropes is 30 degrees. Find the resultant force exerted the barge.

*Thursday, September 8, 2016 by Anna*

**Physics**

a ship is headed towards east at a thrust speed of 7.00 knots. A strong wind pressure causes the ship to deviate to the north at 1.00 knots. The sea current is flowing to the southwest at 4.00 knots. Determine the velocity of the ship relative to the earth's surface.

*Thursday, September 8, 2016 by Julie*

**Physics**

A block of mass m1= 3.70kg rests on a 30degree incline and is held stationary by a mass of 1.3kg hanging vertically over a frictionaless pulley at the top. Calculate the value of u (coefficent of friction)

*Thursday, September 8, 2016 by james *

**physics**

A balloon was released at sea level from the bottom of a building and retrieved at the top of the building. Its volume changed from 500 cm^3 to 510 cm^3. The pressure at sea level is 100 kPa. If the density of air is constant at 1.29 kg/m^3, what is the height of the building?

*Thursday, September 8, 2016 by Anonymous*

**Physics **

Throw a stone straight up in the air. At its highest height what is its speed? Is it accelerating then?

*Thursday, September 8, 2016 by Amy*

**Physics**

A student with mass 55 kg jumps off a high diving board. Using 6.0×10^24 kg for the mass of the earth, what is the acceleration of the earth toward her as she accelerates toward the earth with an acceleration of 9.8 m/s2 ? Assume that the net force on the earth is the ...

*Wednesday, September 7, 2016 by Howard*