Monday

December 5, 2016
**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*

**Physics **

The average distance between the earth and the sun is 1.50X10^8 A. calculate the average velocity in km/h of the earth along its original path The average distance between the earth and the sun is 1.50X10^8 B. convert your answer from km\h to m\s. Show all units.

*Wednesday, September 7, 2016 by Layton*

**Physics**

A football player runs the pattern given in the drawing by the three displacement vectors A, B, and C. The magnitudes of these vectors are A = 5.0 m, B= 15 m, and C = 18 m. Using the component method, find the magnitude and direction è of the resultant vector

*Wednesday, September 7, 2016 by Nat*

**physics**

A highway curve forms a section of a circle. A car goes around the curve. Its dashboard compass shows that the car is initially heading due east. After it travels 620. m, it is heading 30.0° south of east. Find the radius of curvature of its path.

*Wednesday, September 7, 2016 by j*

**Physics**

Given Two parallel plate capacitors with a seperation d(metres) in free space connected to a dc supply of volts,v. A dielectric material of thickness b(metres) is inserted between the plates so that a distance (d-b)m remains without dielectric. Show that the the pd per unit ...

*Wednesday, September 7, 2016 by Joel*

**physics**

A car is moving at 25.0m/s on a straight highway lane. 10.0m in front of the car is a van that is travelling with the same speed. The van’s driver suddenly hits the brakes to avoid an obstruction, slowing down at a rate of 9.00m/s². The car’s driver reacts 0.85s...

*Wednesday, September 7, 2016 by allyson*

**physics**

a body of mass 2kg starting from origin t=0,has an initial velocity of 5m/s along x-axis and it subjected to constant force of 4N in y-direction in a gravity free space.the distance from origin after 4 seconds is nearly equal to

*Wednesday, September 7, 2016 by hari*

**Physics**

a batman deflects a boy by an angle 90 without change in acc. speed of 54km/h if mass of ball is 0.15kg. what is the impulse exerted on the ball also find force exerted on ball if ball remain for 0.1sec In connected with wall?

*Wednesday, September 7, 2016 by Mani*

**Physics **

Calculate the skid to stop distance of a car traveling on a road at 100 kilometers per hour with a coefficient of friction of 0.68.....

*Wednesday, September 7, 2016 by Austin*

**Physics**

Calculate the skid_to_stop distance of a car traveling on a road at 100 kilometers per hour with a coefficient of friction of 0.68...

*Wednesday, September 7, 2016 by Austin*

**physics**

If I bring a 500 gauss magnet near to a 50 gauss magnet to repel them each other.will then both magnets repel each other with equal force or the 500 gauss magnet will repel 50 gauss magnet to more distance?

*Wednesday, September 7, 2016 by vikram*

**ma**

In a class of 100 students, 40 failed in Math, 30 failed in Physics, 60 failed in Chemistry. 35 passed in both Math and Physics. 20 passed in Physics and Chemistry. 25 passed in Math and Chemistry. Each student passed in at least one subject. How many students passed in all ...

*Wednesday, September 7, 2016 by Anonymous*

**Physics (College)**

A student rides her bicycle home from physics class to get her physics book and then heads back to class. It takes her 21.0 min to make the 12.8 km trip home and 13.0 min to get back to class. Calculate her average speed for the round-trip. Answer must be converted to km/h I ...

*Wednesday, September 7, 2016 by Maya*

**Physics **

A car moves with 60km/h in first one hour and with 80km/h in next half an hour. Find 1. Total distance travelled by the car. 2. average speed of car in total 1.5 hours.

*Wednesday, September 7, 2016 by Sakshi*

** Physics **

The speed limit on a nearby road is 25 mph what is the speed and meters per second

*Tuesday, September 6, 2016 by Joshu*

**physics **

Vector has a magnitude of 113 units and points 34.0 ° north of west. Vector points 63.0 ° east of north. Vector points 17.0 ° west of south. These three vectors add to give a resultant vector that is zero. Using components, find the magnitudes of (a) vector and (b...

*Tuesday, September 6, 2016 by Tamara*

**Physics **

The Olympic record for the marathon set in 2008 is 2 h, 6 m, 32 s. The marathon distance is 26 mi. What was the average speed of the record-setting runner in km/h?

*Tuesday, September 6, 2016 by Sophia *

**physics**

How do the laws of physics apply to others sciences such as biology chemistry and earth science? And give an example to show the connection.

*Tuesday, September 6, 2016 by nulloa*

**Physics**

Suppose you can throw a ball a maximum horizontal distance L when standing on level ground. How far can you throw it from the top of a building of height h = L if you throw it at 27.9 degrees? (Ignore your height and any effects due to air resistance.)

*Tuesday, September 6, 2016 by Anonymous*

**Physics**

A boat that can travel at 3.0 km/h in still water crosses a river with a current of 1.7 km/h. At what angle must the boat be pointed upstream to travel straight across the river?

*Tuesday, September 6, 2016 by Jake*

**physics simple harmonic motion**

A particle moving in simple harmonic motion passes through the equilibrium point (x=0) 8 times per second. At t=0 its velocity at x=0.015m is negative. It travels 0.6m in a complete cycle. The particle's position as a function of time is described by the following function...

*Tuesday, September 6, 2016 by byu*

**Physics**

A ball is thrown off a cliff that is 10 meters tall. The horizontal speed of the ball is 8 m/s. Assuming no air resistance, how far from the base of the cliff will the ball land?

*Tuesday, September 6, 2016 by Kasey *

**Physics**

Vector V1 is 6.6 units long and points along the negative x axis. V2 is 8.5 units long and points at +55 degrees to the positive x axis. A) What are the x and y components of each vector? B) Determine the sum of vector 1 and vector 2. (magnitude and angle) I have solved the ...

*Tuesday, September 6, 2016 by Anonymous*

**physics**

A thin non-conducting rod is bent to form the arc of a circle of radius a and subtends an angle at the center of the circle. A total charge q is spread uniformly along its length. Find the electric field at the center of the circle in term of, a, q, and angle.

*Tuesday, September 6, 2016 by Supansa*

**physics**

a particle having a charge of -2.0 x 10^-9 is acted on by a downward electric force of 3.0 x 10^-6 in a uniform electric field. what is the magnitude and direction of the electric force exerted on a proton placed in this field. what is the gravitation force on the proton. what...

*Tuesday, September 6, 2016 by Supansa*

**Physics**

Two solids A and B float in water .A floats with half of its volume immersed and B float s with 2/3 of its volume immersed.the ratio of their densities is ?

*Tuesday, September 6, 2016 by Aravind*

**Physics**

An aircraft is fired vertically upwards with a muzzle velocity of 100m/s calculate : A)the maximum height it can attain B)the time taken to reach this height

*Tuesday, September 6, 2016 by Ekikereobong*

**Physics (Momentum and collusion)**

Two balls of equal mass undergo a collision. Ball one is initially travelling horizontally with a speed of 10 m/s, ball two is initially at rest. After the collision, ball one moves away with a velocity of 4.7 m/s at an angle of 60 degrees from it's original path and ball ...

*Tuesday, September 6, 2016 by Paul*

**physics **

An object 4cm high is placed 25cm from a covering lens of focal length 15cm the image height is

*Monday, September 5, 2016 by ifeanyi *

**Physics**

A student says a speed of 50 m/s is faster than a speed of 140 km/h because the number is bigger. what would you say to them?

*Monday, September 5, 2016 by kris*

**Physics**

A 1500 kg car is travelling at 20 m/s. It brakes to a stop causing the brake pads to heat up from 25 degrees Celsius to a temperature too hot to touch. The total mass of the pads altogether is 4.0 kg and their heat capacity is 8.9 x 102 J/kg0C. If these pads are removed from ...

*Monday, September 5, 2016 by Ishmael*

**physics**

a car is moving at 17.7 m/s when it begins to slow down with a deceleration of 2.5 m/s2. how long does it take to travel 20 meters as it slows down

*Monday, September 5, 2016 by shin*

**physics**

Find the resultant of the following two displacements; 2.0 m 40 degrees 4.0 meters at 127 degrees. the angles are taken relative to the x-axis

*Monday, September 5, 2016 by jenny*

**Science**

500g of water at 100°c is mixed with 300g of water at 20°c.specific heat capacity of water is 4.2Jg°c.find the final temperature of mixture. (Physics)

*Monday, September 5, 2016 by Rahul*

**Physics**

Is KNO3 soluble in KOH solution?

*Monday, September 5, 2016 by Nisha*

**physics**

How much force will be required to move a seesaw system which is balanced with 50 kg weight on both side to move it 4 centimeter towards up and down side (linear motion).

*Sunday, September 4, 2016 by vikram*

**physics**

how much output I can get if a coil having 100000 turns moves pass a strong 3000 gauss neodymium magnet only once a time?

*Sunday, September 4, 2016 by vikram*

**Physics**

Mars, on average, is 140 million miles from the Sun. 1 mi = 1609 m . Part #1: Express the distance between Mars and the Sun in meters using powers of 10. Express your answer using two significant figures. Answer: d =2.25×10^11 m Part #2: Express the distance between Mars...

*Sunday, September 4, 2016 by Nicolle*

**Physics**

Ho can I calculate the volume of a CD that is 0.75 mm thick has outer diameter of 128 mm and inner diameter of 15 mm.

*Sunday, September 4, 2016 by Sara*

**Physics**

Calculate the work done by a 300N Force moving a 20kg object a distance of 50m

*Sunday, September 4, 2016 by Danielle*

**Physics**

A car travel from a to b at 60km and return to a at 90km. What is the average velocity and average speed ?

*Sunday, September 4, 2016 by Anju*

**Physics (EMI)**

A metal disc of radius R rotates with angular velocity Omega (w) about an axis perpendicular to its plane passing through its centre in a magnetic field B acting perpendicular to the plane of the disc calculate the induced EMF between the rim and the axis of the disc

*Sunday, September 4, 2016 by aniket singh*

**physics**

How much energy will be required to move a balance system to move it 4 centimeter towards up and down side (linear motion).

*Sunday, September 4, 2016 by vikram*

**physics (Simple harmonic motion)**

X(t)=0.142sin(2t+0.19) b) Find the travelled distance by block at t2=3.5min [37.963m].

*Saturday, September 3, 2016 by bling pls help*

**physics (Simple harmonic motion)**

In a horizontal block-spring system,the block mass is m=0.5kg and the spring constant is k =2N/m. At t1=0.1s the block velocity is +0.263m/s and the acceleration is -0.216m/s2. Assuming that the system is undergoing SHM.Write the expression for block displacement from ...

*Saturday, September 3, 2016 by bling pls help*

**Physics**

An airplane with a mass of 1.20x10^4 kg tows a glider with a mass of 0.60x10^4 kg. if the airplane propellers provide a net forward thrust of 3.60x10^4, what is the acceleration of the glider? I'm thinking that I should add the masses and then solve using the equation Fn=...

*Saturday, September 3, 2016 by HiMyNameIsRandy*

**Physics**

A car uniformly accelerates from rest at 3 m/s^2 for 8 seconds. At the end of the 8 seconds the car uniformly brakes at -5m/s^2 for 4 seconds. What total distance is traveled by the car during the 12 seconds of motion?

*Saturday, September 3, 2016 by Elizabeth*

**Physics**

A child throws a small ball vertically upwards. The ball is caught at the initial height 1.8 seconds after being thrown. What was the net displacement for the ball? What was the initial speed of the ball? What was the final speed of the ball? How high did it rise?

*Saturday, September 3, 2016 by Elizabeth*

**Physics**

A ball is thrown straight up at an initial speed of 24 m/s. How long did it take to reach maximum height? How high did it rise before falling again? I am confused on how to attempt this problem. Please provide me with some guidance:)

*Saturday, September 3, 2016 by Elizabeth*

**Physics**

PhysicsA race car travels northward on a straight, level track at a constant speed travels 0.755 km in 18.0 s. The return trip over the same track is made in 23.0 s. (a) What is the average velocity of the car in m/s for the first leg of the run? 41.94 Correct: Your answer is ...

*Saturday, September 3, 2016 by Drake*

**Physics**

In general, what conditions with observable effects make magnets interact with non-magnet materials?

*Saturday, September 3, 2016 by Jave*

**Physics**

A race car travels northward on a straight, level track at a constant speed travels 0.755 km in 18.0 s. The return trip over the same track is made in 23.0 s. (a) What is the average velocity of the car in m/s for the first leg of the run?

*Friday, September 2, 2016 by Drake*

**Physics**

a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s? I keep getting the answer 34.3m/s but it is counted wrong. I found an answer on Chegg that say 29.4 m/s but I can't figure out how they are getting that answer.

*Friday, September 2, 2016 by Rachel*

**Physics **

A hot-air balloon is rising straight up with a speed of 3.0 m/s. A ballast bag is released from rest relative to the balloon when it is 9.5 m above the ground. How much time elapses before the ballast bag hits the ground?

*Friday, September 2, 2016 by Mike*

**science ( physics )**

Two cars A and B are seprated by a distance of 0.5 km and moving in the same direction with same speed. A car C moving with 10 km/h in opposite direction meets these cars at an interval of 1 minute. The speed of A and B is

*Friday, September 2, 2016 by Shivam karn*

**physics**

a diver of mass 60kg stands on the end of a diving board of mass 30kg and length 2m. calculate the force exerted by the spring 30 cm away from the pivot. (i think that the force asked is 300N since W=mg (30×10)) hence, calculate the upward reaction force at the pivot and...

*Friday, September 2, 2016 by Kylie*

**College Physics**

At what voltage would a 9 μF capacitor have the energy to lift 3 grams by 1 cm? i understand i need the0.5CV^2 equation however I don't know how to answer this

*Thursday, September 1, 2016 by mike*

**Physics **

you toss a racquetball directly upward and then catch it at the same height you released it 1.90 s later. Assume air resistance is negligible.What is the acceleration of the ball while it is moving upward?What is the acceleration of the ball while it is moving downward?What is...

*Thursday, September 1, 2016 by Miranda *

**physics**

A soccer ball is released from the top of a smooth incline. After 4.54 s the ball travels 8.1 m. One second later it has reached the bottom of the incline. Assume the ball's acceleration is constant and determine its value ( m/s2). How long is the incline?

*Thursday, September 1, 2016 by clair*

**Physics**

An airplane has an airspeed of 950 km/h due east. There is a crosswind blowing in a direction of 550 south of east at 85 km/h. Calculate the velocity of the airplane relative to the ground.

*Thursday, September 1, 2016 by Piyush*

**physics**

what is the difference beteewn resultant and equlibrium

*Thursday, September 1, 2016 by Akeelah*

**physics**

the mass of the density bottle is 18g when empty 44g when full of water and 39 when full of a second liquid. caculate the density of liquod?

*Thursday, September 1, 2016 by Aabdurrahman*

**PHYSICS CLASS 9**

A car moves at a speed of 40km/h, It is stopped by applying brakes which produces a uniformacceleration of -0.6m/s2. How much distance will the vehicle move before coming to stop?

*Wednesday, August 31, 2016 by JAYITA CHAUDHURI*

**Physics **

Write 2.38x10 to the 6th power in standard notation

*Wednesday, August 31, 2016 by Steph*

**Physics**

How much work is required to lift a bag of wheat (mass 50kg) to a height of 2.4m?

*Wednesday, August 31, 2016 by Abbey*

**Physics**

A small car has a mass of 300 kg and it is brought to rest in 4 seconds from a speed of 20 metres per second.If there is no resistance to motion,find the force exerted by the brakes

*Wednesday, August 31, 2016 by Kila*

**physics**

The periodic time of simple pendulum varies directly as the mass(m) of a Bob, length (l) of the place where the pendulum is suspended. determine the expression of periodic time(t)

*Wednesday, August 31, 2016 by kinyua*

**Physics**

A squash ball typically rebounds from a surface with 25% of the speed with which it initially struck the surface. Suppose a squash ball is served in a shallow trajectory, from a height above the floor of 39 cm, at a launch angle of 6.0° above the horizontal, and at a ...

*Tuesday, August 30, 2016 by Kendall*

**Physics**

The roof of a two-story house makes an angle of 29° with the horizontal. A ball rolling down the roof rolls off the edge at a speed of 4.5 m/s. The distance to the ground from that point is 8.2 m. (a) How long is the ball in the air? (b) How far from the base of the house ...

*Tuesday, August 30, 2016 by Kendall*

**physics**

you are driving home from school steadily at 95 km/h for 180 km. It then begins to rain and you slow down to 65 km/h. You arrive home after driving 4.5 hours. How far is your hometown from school? x=180km + (95km/h)(4.5h) + (1/2)(-30km/h)(4.5h)^2 I calculated 303.75 km, but my...

*Tuesday, August 30, 2016 by Anonymous*

**Physics**

An archer fires an arrow, which produces a muffled "thwok" sound after it hits a target. If the archer hears the "thwok" exactly 1.2 s after firing the arrow and the average speed of the arrow was 48 m/s, what was the distance separating the archer and the ...

*Tuesday, August 30, 2016 by Anonymous*

**physics**

a charge of 6mC is placed in each corner of a square 1m on each side. determine the magnitude and direction on each side

*Tuesday, August 30, 2016 by abby*

**Physics **

Need someone to check my work and answers: At the instant the traffic light turns green, a car that has been waiting at an intersection starts ahead with a constant acceleration of 2.80 m/s2. At the same instant a truck, traveling with a constant speed of 20.0 m/s, overtakes ...

*Tuesday, August 30, 2016 by Howard*

**Physics **

A student travels 300m towards North and then 400m towards East to reach his school. Calculate the distance of his school from his home.

*Tuesday, August 30, 2016 by Crystal *

**Physics**

The first meters of a 100-meter dash are covered in 2 seconds by a sprinter who starts from rest and accelerates with a constant acceleration. The remaining 90 meters are run with the same velocity the sprinter had after 2 seconds. a. Determine the sprinter's constant ...

*Monday, August 29, 2016 by Allyson*

**PHYSICS**

Runner A is initially 5.3 km west of a flagpole and is running with a constant velocity of 8.1 km/h due east. Runner B is initially 4.7 km east of the flagpole and is running with a constant velocity of 7.8 km/h due west. How far are the runners from the flagpole when their ...

*Monday, August 29, 2016 by tyler*