Tuesday

October 25, 2016
**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*

**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 sofia*

**Physics**

At which point or points is the electric field zero in figure? I can not post the picture, but this is what it looks like: 1 2 3 4(4+)5 6(-)7 8 9 10 The (4+) is a proton with 4 charges. The (-) is an electron with 1 charge. They are on a number line 1-10. The proton is between...

*Monday, August 29, 2016 by Brittany*

**physics**

Runner A is initially 6.0 km west of a flagpole and is running with a constant velocity of 7.8 km/h due east. Runner B is initially 4.2 km east of the flagpole and is running with a constant velocity of 7.6 km/h due west. What will be the distance of the two runners from the ...

*Monday, August 29, 2016 by adam*

**physics**

Find the density of the earth if its mass is 6×10^3kg and radius is 6.4×10^3km

*Monday, August 29, 2016 by cadaawe*

**physics**

A 1000-kg airplane moves in straight flight at constant speed. The force of air friction is 1800 N. The net force on the plane is ?

*Monday, August 29, 2016 by Mahmoud*

**physics**

A wire of nichrome of length 80cm has a resistance of 50 ohms. if the wire is four folded, find new resistance.

*Monday, August 29, 2016 by vanditha*

**Physics**

A car, in overtaking trailer, uniformly accelerated its speed from 40 kph to 90 kph in 8 seconds. Calculate the distance traveled during the period of acceleration.

*Monday, August 29, 2016 by Unknown*

**Physics**

Hi everybody! I need this quick answer, please help! The beam AB in the figure has length 3L and uniform section stiffness EI. The beam is fixed at A(x=0) and loaded by an upward concentrated force, P, applied at its free end B(x=3L). A concentrated moment Q is also applied, ...

*Sunday, August 28, 2016 by carolina02*

**Bio physics chemistry pre medical **

Methane react with steam to form h2 and co. . what volume of h2 can be obtained from 100cmcube of methane at the standard temperature and pressure? ?

*Sunday, August 28, 2016 by Hania*

**Bio physics chemistry pre medical **

The vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will be vitamin a has in 500mg capsule?

*Sunday, August 28, 2016 by Anonymous*

**Bio physics chemistry pre medical **

Vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will vitamin a contian in 500mg capsule? ? Plz tell me now tomorrow is my test .I will be very grateful of u. .

*Sunday, August 28, 2016 by Hania*

**physics**

a ball projected vertically upwards from the top of the tower 60 meters high with a velocity of 30 meters per second. what is the maximum height above the ground? how long does it take to reach the ground?

*Sunday, August 28, 2016 by richard*

**Physics**

Initial Statement: A soccer ball is kicked with an initial horizontal velocity of 15 m/s and an initial vertical velocity of 14 m/s. 1) What is the initial speed of the ball? 20.518 2) What is the initial angle θθ of the ball with respect to the ground? 43.025 3) ...

*Sunday, August 28, 2016 by Aidan*

**physics**

Simpson drives his car with an average velocity of 48.0 km/ to the east. How long will it take him to drive 144 km on a straight highway?

*Sunday, August 28, 2016 by monet*

**Physics **

Michael flies in an airplane due north to Michigan. The pilot encounters a direct crosswind from the west of 120 mph. What direction must the pilot steer in order to end up with a resultant of due north and average velocity of 120 mph? Measure and calculate the speed of the ...

*Sunday, August 28, 2016 by Jennifer*

**Honors Physics**

How do you determine the mass of fuel in a semi truck?

*Sunday, August 28, 2016 by Leona*

**Physics**

The driver of a sport car pushed down the accelerator so that the engine pushes the care forward with a force of 2500N,s tarting from rest. How fast the car can go after 20s later? I have tried this by using v=u+at but i don't have a. From F=ma, i cant get the value of a ...

*Sunday, August 28, 2016 by Tan*

**Bio physics chemistry pre medical **

Vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will vitamin a contian in 500mg capsule? ? Plz tell me now tomorrow is my test .I will be very grateful of u. .

*Sunday, August 28, 2016 by Hania*

**Bio physics chemistry pre medical **

Methane react with steam to form h2 and co. . what volume of h2 can be obtained from 100cmcube of methane at the standard temperature and pressure? ?

*Sunday, August 28, 2016 by Hania*

**PHYSICS**

JOHN WANTS TO PADDLE HIS CANOE ACROSS A RIVER THAT IS 200M WIDE, HE STARTS FROM THE EAST SIDE. THE WATER CURRENT FLOWS NORTH-SOUTH AT 0.5MS^-1. IT TAKES JOHN 252S TO CROSS THE RIVER. 1. DRAW A DIAGRAM TO GRAPHICALLY REPRESENT THE VELOCTY VECTORS OF THE WATER CANOE AND THEIR ...

*Sunday, August 28, 2016 by SARAH*

**physics**

A 5-kg block lies on a smooth table top. A horizontal string connected to the block is passed over a small pulley at the edge of the table, and a body of mass 8 kg is hung from the other end of the string. Find the tension in the string and the acceleration of the bodies when ...

*Sunday, August 28, 2016 by Rhian*

**physics**

A bus is moving at a speed of 20m/s beyond to slow at a constant rate of 3m/s each second find how far it goes before stopping

*Sunday, August 28, 2016 by charan*

**physics**

Rocket-powered sleds are been used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 495 m/s in 1.78 s and can be brought to a stop again in 2.16 s. Find the acceleration of the sled while ac- celerating. Answer in units of m/s2...

*Saturday, August 27, 2016 by kailee*

**physics**

a 50 kg crate is at rest on a level surface the coefficients of friction are 0.3 and 0.4,what is the normal force acting on the crate, a man begins pushing horizontally on the crate how much force must the man exert to start the crate moving, how much force must the man exert ...

*Saturday, August 27, 2016 by bryan*

**physics**

a slingshot launches a rock straight upward at 25 m/s, how high does the rock go, how long is it in the air, what is the velocity and the acceleration of the rock at its highest point

*Saturday, August 27, 2016 by scott*

**physics**

a greyhound is capable of running at 40 mph, how many meters could the greyhound run in 3 minutes at this speed, how many seconds would it take the greyhound to run 1 km at this speed

*Saturday, August 27, 2016 by scott*

**Physics. Pleaseee helpppp**

Four electrons are located at the corners of a square 10.0nm on a side, with an alpha particle at its midpoint. How much work is needed to move the alpha particle to the midpoint of one of the sides of the square?

*Saturday, August 27, 2016 by Nanny*

**Physics**

A piece of wood of mass 60kg and density 600kg/m3 flows in water of density of 1000kg/m3.calculate (a) volume of water that the wood displaced (b) the fraction of volume of mass and water

*Saturday, August 27, 2016 by Pauliho*

**physics **

what change in velocity would be produced on a body of mass 4kg, if a contact force of 16N act on it for 2sec.

*Saturday, August 27, 2016 by sanusi *

**Physics **

A pebble is dropped from rest from the top of a tall cliff and falls 4.9meters after 1 second has elapsed. How much further does it drop in the next 2 seconds?

*Friday, August 26, 2016 by Hiba*

**Physics**

A heavy rainstorm dumps 1.0 cm of rain on a city 8 km wide and 9 km long in a 2 hour period. How many metric tons (1 metric ton = 10^3 kg) of water fell on the city? (1 cm^3 of water has a mass of 1g = 10^-3 kg) What I have thus far: 72 km^2 x (1E^10 cm^2/1km^2) x (10^-3 kg/ ...

*Friday, August 26, 2016 by Anonymous*

**Physics**

How many metric tons (1 metric ton = 10^3 kg) of H2O fell on a city? (1cm^3 of H2O has a mass of 1g = 10^-3 kg) Thus far I have: 10^-3 Kg x (1 metric ton/10^3) but I don't understand the significance of adding 1 cm^3 to the problem.

*Friday, August 26, 2016 by Kaitlin*

**12th grade physics**

A boat pulled through a canal by horses walking parallel to the canal and exerting a force of 1000 N on a tow Rope 40 meters long. Is the distance from the boat to the horse track is 15 meters, what is the magnitude of the effective component pulling the boat forward

*Friday, August 26, 2016 by Daryione*

**physics**

round of the following digits- 3.65*105(upto are place of decimal) 0.882026(upto three significant figures) 311.299(upto four significant figures) 4.783(upto two significant figures)

*Friday, August 26, 2016 by yashaswi*

**Physics**

A water tank has a mass of 3.65 kg when empty and has a mass of 52.5 kg when filled to a certain level. What is the mass of water in the tank?

*Friday, August 26, 2016 by Faith *

**physics**

a ball is vertically upward with a velocity of 35m/s. how long will the ball reaches the ground?

*Friday, August 26, 2016 by jerson*

**Physics**

In a novel from 1866 the author describes a spaceship that is blasted out of a cannon with a speed of about 11.000 m/s. The spaceship is approximately 274 m long but part of it is packed with gunpowder, so it accelerates over a distance of only 213 m. What was the acceleration...

*Friday, August 26, 2016 by Geoff*

**Physics**

A racquet ball is struck in such a way that it leaves the racquet with a speed of 4.8 m/s in the horizontal direction. When the ball hits the court, it is a horizontal distance of 1.94 m from the racquet. Find the height of the racquet ball when it left the racquet. I need ...

*Friday, August 26, 2016 by Geoff*

**Physics I - Modern**

An electron with a speed of 0.988c is emitted by a supernova, where c is the speed of light. What is the magnitude of the momentum of this electron? Thanks for any help you can offer! I've tried so many things!

*Thursday, August 25, 2016 by Victoria*

**physics**

a greyhound is capable of running at 40 mph how many meters could the greyhound run in 3 minutes at this speed, how many seconds how many seconds would it take the greyhound to run 1 km at this speed

*Thursday, August 25, 2016 by bryan *

**physics**

A rock is thrown straight up with an initial velocity of 15m/s. ignore the effect of air resistance , how high will the rock rise ?

*Thursday, August 25, 2016 by Mahmoud*

**Physics**

Space explorers discover an 8.7×10^17kg asteroid that happens to have a positive charge of 4400 C. They would like to place their 3.3×10^5kg spaceship in orbit around the asteroid. Interestingly, the solar wind has given their spaceship a charge of -1.2C. What ...

*Thursday, August 25, 2016 by Brittany*

**physics**

A ball is thrown upward into the air with a speed of 15m/s. At what times does the ball pass a point 8 meters above the person's hand? 8m=-0.5(9.8)(t) t=1.8 seconds Is that correct?

*Thursday, August 25, 2016 by Chelsea Woodard*

**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...

*Thursday, August 25, 2016 by Anonymous*