Saturday

August 27, 2016
**physics**

A rope of mass M and length L is being rotated about one end in a gravity free space. A pulse is being created at one of the ends. The angle through which rope will be rotated in the time when pulse reaches the opposite end of rope for first time and for the angular velocity ...
*Monday, July 18, 2016 by michel*

**Physics**

A tunnel is 800 m long.A 100 m long train crosses the tunnel at a speed of 30m/s.Find the time taken by the train to cross it.
*Monday, July 18, 2016 by Avinandan*

**Physics**

What is the electric field midway between an electron and a proton separated by 0.8 nm. Don't know what formula to use. Nothing on line is helping me get to the correct answer. Appreciate anyone's help. Thanks
*Sunday, July 17, 2016 by Anna*

**University of jos,physics**

A man travels along a square path each side of length 100m with a velociy of 40m/s,50m/s,40m/s,50m/s respectively.calculate the average velocity.
*Sunday, July 17, 2016 by Jemimah*

**physics c**

Suppose q1 = +2.90 µC is no longer at y = 0.300 m, but is now at y = 0.244 m. The charge q2 = +2.90 µC is at x = 0 and y = 0.500 m, and the point 3 is at x = y = 0.500 m.
*Sunday, July 17, 2016 by Anonymous*

**University of jos,physics**

A man walks 3m north then 4m east.calculate his displacement from the starting point.
*Sunday, July 17, 2016 by Jemimah*

**University of jos,physics**

A stone is droped from the top of a cliff and it hits the ground 5 seconds later.calculate the height of the cliff.
*Sunday, July 17, 2016 by Jemimah*

**Physics**

What is the wavelength of light in water if it has a frequency of 6.8 x 10^14 Hz? I don't know what formula to use and don't understand. I tried Lambda=c/v and got it wrong. Answer needs to be in nm. Thanks.
*Sunday, July 17, 2016 by Anna*

**Physics**

Bar BC in the figure has length L, constant cross sectional area A, and is composed of a homogeneous material with modulus E. The bar is fixed between walls at B (x=0) and C (x = L). The bar is subjected to a variable distributed load per unit length, oriented in the direction...
*Sunday, July 17, 2016 by skrillex*

**Physics**

The composite bar BCD in the figure is fixed at the wall B (x=0), and has constant cross sectional area A_0. The bar is composed by joining, at section C, two segments (BC and CD) of equal length L. Segment CD is homogeneous, made of copper. Segment BC is obtained by joining ...
*Sunday, July 17, 2016 by skrillex*

**Physics**

An object is located midway between the focal point and the center of a concave spherical mirror. Draw a ray diagram to locate its image. Is the image real or virtual, erect or inverted, magnified or reduced in size? Completely baffled by above question and the next question. ...
*Saturday, July 16, 2016 by Anna*

**physic**

Kirsten’s mass is 3.73 slugs. Being the physics fan that she is, she decides to see what her apparent weight will be during an elevator ride. Beginning at rest, the elevator accelerates upward at 4.50 ft/s2 for 3.00 s and then continues at a constant upward velocity. ...
*Saturday, July 16, 2016 by hassan yousif*

**physics**

The current a series circuit in 5A when an additional resistance of 2 ohm is inserted the current drops to 4A voltage remaining same the original resistance of the circuit is
*Saturday, July 16, 2016 by sumit dubey*

**Physics**

A projectile leaves the ground at an angle of 60degree to the horizontal.it initial kinetic energy is E. Neglecting air resistance, it kinetic energy at the highest point of the motion is
*Saturday, July 16, 2016 by Emmanuel*

**Physics**

Find the maximum height and the time of flight of a body fired vertically up from the ground given that it loses 60 percent of its initial speed in rising 4.2m
*Saturday, July 16, 2016 by Aaz*

**General Physics **

A 2.3 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction of an x axis is applied to the block. The force is given by F with arrow(x) = (2.6 − x^2) N, where x is in meters and the initial position of the ...
*Friday, July 15, 2016 by Justin*

**Physics**

Determine the magnitude of current I3. Let the voltage of the bottom battery VB =13.0 volts and r= 1.0 Ω.
*Friday, July 15, 2016 by Anonymous*

**Physics**

Capacitor X is charged to a potential difference 68 V by a battery. It is disconnected from the battery and then connected in parallel to an uncharged 12 µF capacitor. A voltage of 20 V is measured across the parallel combination. Calculate the capacitance of capacitor X...
*Friday, July 15, 2016 by Kimmie*

**Physics**

Two bodies begin to fall freely from the same height but 2nd one falls T seconds ater 1st.The time(after which the 1st body begin to fall) when the diatance between them is L is: Options 1.T/2 2.T/2+L/gT 3.L/gT 4.T+2L/gT I am not understanding how to find the time and what is ...
*Friday, July 15, 2016 by Rohan*

**physics**

vector a has a negative x component 3 units in length and positive y component 2 units in length. What vector B when added to vector A gives a resultant vector with no x component and a negative y component 4 units in length
*Friday, July 15, 2016 by John paul*

**PHYSICS--**

The objective and eyepiece of an astronomical telescope are double convex lenses with refractive index 1.5. When the telescope is adjusted to infinity, the separation between the two lenses is 16 cm. If the space between the lenses is now filled with water and again telescope ...
*Friday, July 15, 2016 by RAM*

**Physics**

Research on the physics of living systems.Give two examples to show how physics helps to understand the concepts of evolution, biological systems of living organisms.
*Friday, July 15, 2016 by Karan*

**Physics**

Research on the physics of living systems.Give two examples to show how physics
*Friday, July 15, 2016 by Karan*

**physics**

A rope of mass M and length L is being rotated about one end in a gravity free space. A pulse is being created at one of the ends. The angle through which rope will be rotated in the time when pulse reaches the opposite end of rope for first time and for the angular velocity ...
*Friday, July 15, 2016 by Anonymous*

**Physics**

A bullet is fired horizontally from the top of a cliff with a speed of 30m/s.assuming that there is no air resistance, what will be its speed 3sec later?
*Friday, July 15, 2016 by Emmanuel*

**physics**

33. A rope of mass M and length L is being rotated about one end in a gravity free space. A pulse is being created at one of the ends. The angle through which rope will be rotated in the time when pulse reaches the opposite end of rope for first time and for the angular ...
*Friday, July 15, 2016 by rakesh*

**physics**

a 1000kg car is travelling with a speed of 33.3m/s2 when the driver saw an intersection 30m away. how much force is needed to stop the car right away?
*Friday, July 15, 2016 by jericho*

**Physics**

A kid puts 0.12 J of energy in compressing a toy.To which height will the toy rise if the mass of the toy is 0.012kg?
*Thursday, July 14, 2016 by Al-Amin*

**physics**

a heavy object is dropped from the top of a 25 m tall building and it reaches the ground in 2.26 seconds determine the acceleration due to gravity how far did the object fall during the first second how far did the object fall during the 2nd second
*Thursday, July 14, 2016 by glenn*

**physics**

the maximum possible speed a certain car can achieve is 80 m/s (about 180 mph) the car covers a distance of 1km while accelerating up to this speed from rest how fast is the car moving at the halfway point of 500m (the answer is not 40m/s) at what point is the car moving at ...
*Thursday, July 14, 2016 by glenn*

**physics**

the driver of a truck going 50 mph applies the brakes giving the truck a deceleration of 4.5 m/s^2 how long will it take the truck to come to a complete stop what distance will it cover
*Thursday, July 14, 2016 by glenn*

**physics**

a driver traveling 42 mph speeds up to 58 mph over distance of 660 feet how long does this increase in speed take what is the driver's acceleration
*Thursday, July 14, 2016 by glenn*

**physics**

a sports car can accelerate fo 0 to 60 in 3.2seconds what is the acceleration of the car in m/s^2 what distance would it travel at this time
*Thursday, July 14, 2016 by glenn*

**physics**

a motorcyclist drives from a to B with a uniform speed of 30km/h find its average speed
*Thursday, July 14, 2016 by sivapriya*

**physics**

A stone thrown upward at the top of the tower reaches the ground after 5 sec. A second stone is thrown down with the same speed and reaches ground in 3 sec. What is the height of the tower
*Thursday, July 14, 2016 by sai*

**physics**

A hiker begins a trip by first walking 25.0 km 45.0° south of east from her base camp.On the second day she walks 40.0 km in a direction 60.0° north of east, at which point she discovers a forest ranger’s tower.Find the magnitude of the displacement from base camp.
*Thursday, July 14, 2016 by yow*

**physics**

an antelope moving with constant acceleration covers the distance between two points 70.0m apart in 7.00 s.Its speed as it passes the second points is 15.0m/s. a.What is its speed at the fist poin? b.What is ita acceleration?
*Wednesday, July 13, 2016 by Belle*

**Physics**

Five masses are positioned as follow in the x and y axis: m1 = 1 kg at (0,0) m2 = 2 kg at (4,0) m3 = 3 kg at (4,5) m4 = 4 kg at (0, 5) m5 = 5 kg at (2, 2) All x and y values are in meters. Find the magnitude and direction of the net gravitational force experience by m3 due to ...
*Wednesday, July 13, 2016 by Justin*

**physics**

Searches related to A football at rest is kicked so that it start to move with a velocity where horizontal component is 1/2 vm/s. In it's flight , the ball rises to a maximum height of 10m.Assuming that air resistance may be neglected and that the ground is horizontal , ...
*Wednesday, July 13, 2016 by nnenna*

**Physics**

A 4.65-μF and an 9.30-μF capacitor are connected in series to a 60.0-Hz generator operating with an rms voltage of 111 V. What is the rms current supplied by the generator? The capacitors are in series so I used C = C1*C2/(C1 + C2) and got C = 3.1*10^-6 Xc = 1/wC...
*Wednesday, July 13, 2016 by Alli*

**physics**

A car on the bridge weighs 2oooN and is 6m away from one of the bridge piers and 4m from the other. How much force does each pier exert to support the car? Pivot point is the weight of the car on the bridge.
*Tuesday, July 12, 2016 by daniel*

**Physics**

a uniform magnetic field of strength 0.5T is directed at an angle of 30degree to the plane of 100turns regular copper coil of lenght 0.04m and width 0.05mm. the diameter of the copper wire which makes up a coil is 1mm and the resistivity of copper is 0.000000017ohms meter. the...
*Tuesday, July 12, 2016 by Akin*

**Physics**

1, A Body Of Mass 6kg Was Acted Upon By A Constant Force Of 18N. Calc Its Velocity In 5sec. 2. A Car Moving At 108km/hr Was Gradually Brought To Rest By Constant Force Of 2500N After 8sec. Calc The Decelleratio
*Tuesday, July 12, 2016 by Jane*

**Physics**

An electron with a kinetic energy of 0.8 keV is fired normal to the lines of a field of magnitude 50 G. Find: a)the radius of the path b)its acceleration c)its period
*Tuesday, July 12, 2016 by Sabrina*

**Physics**

Two 2.46uC point charges are located on the x axis. One is at x = 1.01m, and the other is at x = -1.01m. Determine the electric field on the y axis at y = 0.455m & Calculate the electric force on a -2.82uC charge placed on the y axis at y = 0.455m I'm using E=kq/r^2 and F=...
*Tuesday, July 12, 2016 by Andrea*

**physics**

A conductor of length 2m carries a current of magnetic field of magnetic flux density 0.5T. The maximum force acting on it is ?
*Tuesday, July 12, 2016 by taylor*

**physics**

An aircraft flying at a horizontally height of 8000m above the ground at 200 metre per second drops a bomb on it's target on the ground. Find the angle between the vertical and the line joining the aircraft and the target immediately the bomb is released.
*Tuesday, July 12, 2016 by ali *

**physics**

An aircraft flying at a horizontally height of 8000m above the ground at 200 metre per second drops a bomb on it's target on the ground. Find the angle between the vertical and the line joining the aircraft and the target immediately the bomb is released.
*Tuesday, July 12, 2016 by ali *

**Physics**

A ball is thrown horizontally from the building roof at a speed of 20 m/s. Takes ball 4 seconds to reach the ground. How tall is building? What is the ball’s speed and direction as it contacts the ground? How far from the base of the building does the ball land? Use ...
*Monday, July 11, 2016 by Bobby*

**Physics**

As shown in the figure below, a 2.25-kg block is released from rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 15.0 cm that ...
*Monday, July 11, 2016 by Brionna*

**Physics**

A resistor R is connected to a 12 V battery. The total current increases five times when a 400 Ohm resistor is added in parallel with it. The value of resistance R is? Please help me.
*Monday, July 11, 2016 by Zabe*

**physics**

a 10k race was held the first place finisher completed the 10km run in 29.5 minutes what was the average speed in miles per hour. In another race the person is given a head start and if they beat the first place finisher at the end the win $2,500 the chosen winner was given a ...
*Monday, July 11, 2016 by glenn*

**physics **

you live 6 miles away from a movie theatre on a particular day it takes you 18 minutes to get to the movie theatre from your house, only half as much time to get home what was your average speed in mph for driving from the theatre, driving home , and the full round trip?
*Monday, July 11, 2016 by glenn*

**physics**

suppose you are able to run at a constant speed of 11mph how long would it take you to run a marathon which is 26.2 miles? what percent of the marathon would you have completed after running 30 minutes?
*Monday, July 11, 2016 by glenn*

**physics**

a man walks 0.9 miles around a shopping mall in half an hour what is his speed in miles per hour, in meters per second, and kilometers per day/?
*Monday, July 11, 2016 by glenn*

**physics**

a woman walks along a circular path of radius of 15m it takes her 2min to get halfway around the path at this halfway point what is her approximate distance traveled, displacement, average speed in m/s, and average velocity in m/s?
*Monday, July 11, 2016 by glenn*

**Physics**

An object of area 15sqcm and height 2 cm has a mass of 50g. what is its density in SI system
*Monday, July 11, 2016 by Sherwin*

**Physics**

“A rifle shot with a velocity of 270m/s at a target that is 400m away.if the shooter wants to directly hit target and what angle he must gire
*Sunday, July 10, 2016 by Paul*

**PHYSICS**

A mass of 2kg is dropped from a height of 3m.Neglecting air resistance,KE of the stone just b4 it hits the ground is ?
*Sunday, July 10, 2016 by EMMANUEL*

**Physics**

a car which 100 m away from a polic station and is initially at rest started running at 80 m/s. How far wil the car be from the police station after 20 seconds
*Sunday, July 10, 2016 by Jay*

**Physics**

A 95 gram piece of metal is heated to 98°C and placed into 200mL of water insulated at 20°C. If the equilibrium temperature is 27.20, find: The heat gained by the water. calories: _________ The specific heat of the metal. cal/(g°C): ________ Hint: 1 mL water has a ...
*Saturday, July 9, 2016 by Anna*

**Physics**

An astronaut constructs a pendulum with a length of 1 meter on a new planet. If the period is 3.9 second, what is the acceleration due to gravity? Can someone help me with formulas to determine this?
*Saturday, July 9, 2016 by John*

**Physics**

A 95 gram piece of metal is heated to 98°C and placed into 200mL of water insulated at 20°C. If the equilibrium temperature is 27.20, find: The heat gained by the water. calories The specific heat of the metal. cal/(g°C) Hint: 1 mL water has a mass of 1 gram I have...
*Saturday, July 9, 2016 by Anna*

**physics**

a dog runs at a speed of 4m/s how many minutes does It take the dog to go 1 km?
*Saturday, July 9, 2016 by glenn*

**physics**

a man walks 0.9 miles around a shopping mall in a half an hour what is the speed in miles per hour in meters per second and in kilometers per day
*Saturday, July 9, 2016 by glenn*

**physics**

a woman drives at a speed of 70 mph how many miles does she travel in 24 minutes
*Saturday, July 9, 2016 by glenn*

**Physics**

A standard DVD has a diameter of 12.0 cm, and a hole that is centered on the axis of symmetry and has a diameter of 1.50 cm. The DVD’s thickness is 1.2 mm, and it's mass is 17 g. If a (very thin) pin extending through the hole of the DVD suspends it in a vertical ...
*Saturday, July 9, 2016 by Mustafa*

**physics**

the acceleration of free fall on the moon is one sixth of that on earth. what would be the period on the moon of a simple pendulum which has a period of one second on the earth?
*Saturday, July 9, 2016 by SUBHAN*

**PHYSICS**

an airplane flying due north with a speed relative to the ground of 300 km/hr. it then encounters a cross-wind that is directed due east. of the resultant speed of the airplane is now 302 km/hr, how fast is the cross wind?
*Saturday, July 9, 2016 by Jem*

**physics**

A high fountain of water is located at the center of a circular pool as in the figure. A student walks around the pool and estimates its circumference to be 177 m. Next, the student stands at the edge of the pool and uses a protractor to gauge the angle of elevation of the top...
*Saturday, July 9, 2016 by imani*

**physics**

a stone is dropped vertically into a lake which one of the following statements best describes the motion of the stone at the instant it enters the water?a)Its velocity and acceleration are both downwards b)It has an upwards velocity and a downward acceleration c)Its velocity ...
*Friday, July 8, 2016 by katrina*

**Physics**

A 600kg car is moving on a level road at 30m/s.how large is a retarding force is required to stop it in a distance of 70m
*Friday, July 8, 2016 by value*

**Physics**

John walks 5m south and 5m west. Calculate john's distance and displacement from the starting point.
*Friday, July 8, 2016 by Ken*

**physics**

A wire of resistance 20ohm is bended to form a closed square. What is the resistance across the diagonal of the square?
*Friday, July 8, 2016 by rituparna*

**physics**

A cylindrical conductor of length L and uniform area of cross section A has resistance R. What will be the area of cross section of another conductor of length 2L and resistance R of the same material?
*Friday, July 8, 2016 by rituparna*

**physics**

A child pulls a wagon with a force of 58 N by a handle making an angle of 27 degrees with the horizontal. If the wagon has a mass of 4.5 kg, to the nearest hundredth of a m/s2 what is the acceleration of the wagon
*Thursday, July 7, 2016 by Anonymous*

**Physics**

A guitar string is 108 cm long and has a mass of 2.90 g. From the bridge to the support post (L) is 70 cm, and the string is under a tension of 470 N. What is the frequency of the first overtone? Only 1 try left please help.
*Thursday, July 7, 2016 by Anon*

**Physics**

Two identical loudspeakers are some distance apart. A person stands 5.70 m from one speaker and 3.00 m from the other. What is the second lowest frequency at which constructive interference will occur at this point? The speed of sound in air is 343m/s. only 1 try left please ...
*Thursday, July 7, 2016 by Anon*

**Physics**

How do you calculate tension
*Thursday, July 7, 2016 by PHIL*

**Physics**

1. How much (Power/Force) is required to lift 8Kg 12meters up within 15sec? 2. Can you tell me difference Power Force from that question or anyway simple?
*Thursday, July 7, 2016 by Jurgen*

**physics**

A spring extends 10 cm whena mass of 100g is attached to it, when is the spring constant
*Thursday, July 7, 2016 by boikobo *

**physics **

A power transmission line is made of copper that is 1.8 cm in diameter. If the resistivity of copper is 1.725 10-8 Ω · m, find the resistance of 7 mi of the line.
*Thursday, July 7, 2016 by Joe*

**Physics**

A 4.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the x-axis?
*Thursday, July 7, 2016 by Justin*

**physics**

12 wires each of resistance r ohm are connected in the form of a skeleton cube.Find the equivalent resistance of the cube ,when a cell is joined across any 1 of the 12 wires forming the cube.
*Thursday, July 7, 2016 by Debasish*

**physics**

A proton is confined to a nucleus of radius 5 FM.what's the minimum uncertainty in momentum?
*Thursday, July 7, 2016 by anushka*

**PHYSICS**

a=40.0 plus-minus 0.1 cm (uncertainty) b=2.5 plus-minus 0.05 cm (uncertainty) Find a/b and its uncertainty Is it 16cm plus-minus 1cm of uncertainty or is it 16.0cm plus-minus 0.4 cm of uncertainty
*Thursday, July 7, 2016 by Clive*

**Physics**

A uniform 100-N pipe is used as lever. Where the fulcrum (the support point) must be placed if a 500-N weight at one end is to balance a 200-N weight at the other end? What is the reaction force exerted by the support on the pipe?
*Thursday, July 7, 2016 by ylopez*

**Physics**

A ball of mass 0.1 is thrown against a wall. It strikes the wall normally with a velocity of 30 meter per second and rebounds with a velocity of 20 m/s. Calculate the change in momentum of the ball.
*Thursday, July 7, 2016 by Sahil*

**physics**

research on the physics of living systems.give to examples to show how physics help to understand the concepts of evolution,biological systems of living organisms.
*Thursday, July 7, 2016 by tarun*

**science,physics,chemistry**

According to our theory atomic size should increase in groups from top to bottom but in group 13 Aluminium has atomic radius 143 pm and Gallium has atomic radius 135 pm which is less WHY??????
*Thursday, July 7, 2016 by Neh*

**Physics**

How much heat is required to convert 175 g of ice at -2°C to water at 2°C? I have no idea how to solve this. Nothing I've found in the book or on-line is helping. Can someone point me to how to solve? Thank you
*Wednesday, July 6, 2016 by Anna*

**Physics **

An astronaut wearing a spacesuit can jump 0.5 m vertically at the surface of the earth. The gravitational acceleration on Mars is 0.4 times that on the earth. If her takeoff velocity is the same, how high can the astronaut jump on Mars?
*Wednesday, July 6, 2016 by Mathusha*

**physics**

You have a mass of 69 kg and are on a 57-degree slope hanging on to a cord with a breaking strength of 135 newtons. What must be the coefficient of static friction to 2 decimal places between you and the surface for you to be saved from the fire?
*Wednesday, July 6, 2016 by kp*

**physics**

6. Cleo and Clare are looking from their balcony to a swimming pool below that is located 15 m horizontally from the bottom of their building. They estimate the balcony is 45 m high and wonder how fast they would have to jump horizontally to succeed in reaching the pool. What ...
*Wednesday, July 6, 2016 by dario*

**Physics**

How many calories will it take to raise the temperature of a 41 g gold chain from 20°C to 100°C? The answer is 102 calories. I've tried everything and can't come up with that answer. Does someone have any idea what was used for a formula? Thanks
*Wednesday, July 6, 2016 by John*

**Physics**

When a body vertically projected with 200m/s. then velocity of body at490m
*Wednesday, July 6, 2016 by Shiva*

**physics **

A copper wire that has a diameter of 2.9 mm carries a current of 39.0 A. Assuming that each copper atom contributes one free electron to the metal, find the drift velocity of the electrons in the wire. The molar mass of copper is 63.5 g/mol and the density of copper is 8.95 g/...
*Wednesday, July 6, 2016 by Joe*

**Physics **

During a thunderstorm, a lightning bolt carries current between a cloud and the ground below. If a lightning bolt transports a total charge of 80 C in 0.001 s, what is the magnitude of the average current? A
*Wednesday, July 6, 2016 by Joe*

**physics**

A proton travels at a speed of 2.0..*.10Ò meters/second. Its velocity is at right angles with a magnetic field of strength 5.5..*.10È³ tesla. What is the magnitude of the magnetic force on the proton?
*Wednesday, July 6, 2016 by asdsa*

**science,physics**

The focal length of a mirror is given by 1/f=1/u+1/v where u and v represent object and image distances respectively,The maximum relative error in f is ?
*Wednesday, July 6, 2016 by Neh*