Saturday

August 27, 2016
**Physics**

A 3.0cm diameter crankshaft that is rotating at 2500 rpm comesto a halt in 1.5 s. a- what is the tangential acceleration of a ponit on thesurface? b-how many revolutions does the crankshaft make as itstops? For this question, what are the applicable concepts and/or laws and ...
*Thursday, March 31, 2016 by Jeff*

**Physics/Cars**

Does the mass of the car matter when driving on the road? When skidding?
*Thursday, March 31, 2016 by Jen*

**Physics**

A man drags a 68.0-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The crate is tilted 23.5° above the horizontal, and the strap is inclined 55.0° above the horizontal. The center of gravity of the crate ...
*Thursday, March 31, 2016 by Anonymous*

**Physics**

Two students are on a balcony a distance h above the S street. One student throws a ball vertically downward at a speed vi ; at the same time, the other student throws a ball vertically upward at the same speed. Answer the following symbolically in terms of vi, g, h, and t. (a...
*Thursday, March 31, 2016 by Anonymous*

**physics**

A particle moving in a striaght line with uniform deceleration has a velocity of 40m/s at point P. 20m/s at point Q and finally come at rest at point R where QR is equal to 50m. calculate the distance PQ. ii, time taken for PQ,. iii, time taken for PR.
*Thursday, March 31, 2016 by Anonymous*

**physics**

A particle moving in a striaght line with uniform deceleration has a velocity of 40m/s at point P. 20m/s at point Q and finally come at rest at point R where QR is equal to 50m. calculate the distance PQ. ii, time taken for PQ,. iii, time taken for PR.
*Thursday, March 31, 2016 by Anonymous*

**physics**

A particle moving in a striaght line with uniform deceleration has a velocity of 40m/s at point P. 20m/s at point Q and finally come at rest at point R where QR is equal to 50m. calculate the distance PQ. ii, time taken for PQ,. iii, time taken for PR.
*Thursday, March 31, 2016 by Anonymous*

**Physics**

What is the potential energy, in joules, of a spring with a force constant of 6 N/m when it is stretched 20 cm from its unstretched length
*Thursday, March 31, 2016 by Jessica*

**11th grade physics**

An electron is placed in a vertical electric field directed upward and of intensity E=5v/m. Compare the weight of the electron to the electrostatic force to which it is submitted. Deduce. Gravitational field strength: g=9.8m/s^2 Thanks.
*Thursday, March 31, 2016 by angy*

**physics**

a conducting loop consisting of a half circle of radius r=0.2m and three straight sections the half circle lies in a uniform magnetic field B that is directed out of the page the field magnitude is given by B=(4t^2 + 2t + 3)T .w/r t is in second. an ideal battery with emf=2v ...
*Thursday, March 31, 2016 by ruth*

**Physics**

A 2 kg block of ice is placed in a container at 0 °C. How much energy is required to completely melt the block of ice? (Specific latent heat of fusion for ice = 334 J/g.) A little confused as to what formula to use for this
*Thursday, March 31, 2016 by ronald*

**physics**

A capacitor acquires 0.002 coulomb when 50 volts is applied. Its capacitance is a. 0.4 microfarad b. 4.0 microfarads c. 40.0 microfarads d. 400.0 microfarads
*Thursday, March 31, 2016 by Isaac Pavlov*

**Physics **

A block is projected up a frictionless inclined plane with initial speed v0 = 2.19 m/s. The angle of incline is θ = 25.1°. (a) How far up the plane does it go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom?
*Thursday, March 31, 2016 by Sara*

**Physics **

Three astronauts, propelled by jet backpacks, push and guide a 118 kg asteroid toward a processing dock, exerting the forces shown in the figure, with F1 = 32 N, F2 = 56 N, F3 = 38 N, θ1 = 30°, and θ3 = 60°. What is the (a) magnitude and (b) angle (measured ...
*Thursday, March 31, 2016 by Sara*

**physics**

A radioactive source of a single nuclide emits 2.4-MeV neutrons at the rate of 9200 neutrons per second. The number of atoms in the source is 4.0 ×109. The activity of the source, in nCi, is
*Thursday, March 31, 2016 by jay*

**physics **

a body is thrown a point with speed 50m/s at an angle 37 degree with horizontal. when it has moved a horizontal distance of 80 m then it's distance from point of projection
*Thursday, March 31, 2016 by kk*

**Physics**

A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71¡ã W] and the second stone moves away at a velocity of 1.25 m/s [N44¡ã E], what was the ...
*Wednesday, March 30, 2016 by tom*

**Physics **

A crate is initially at rest and then slides down a long inclin that is 30 degrees above the horizontal. If the coefficient of kinetic friction is 0.40, the speed of the crate after 5s is ?
*Wednesday, March 30, 2016 by Danielle *

**Physics**

A purple beam is hinged to a wall to hold up a blue sign. The beam has a mass of mb = 6.7 kg and the sign has a mass of ms = 17.4 kg. The length of the beam is L = 2.83 m. The sign is attached at the very end of the beam, but the horizontal wire holding up the beam is attached...
*Wednesday, March 30, 2016 by Anonymous*

**Physics**

A purple beam is hinged to a wall to hold up a blue sign. The beam has a mass of mb = 6.7 kg and the sign has a mass of ms = 17.4 kg. The length of the beam is L = 2.83 m. The sign is attached at the very end of the beam, but the horizontal wire holding up the beam is attached...
*Wednesday, March 30, 2016 by Anonymous*

**Physics**

A high-speed sander has a disk 5.70 cm in radius that rotates about its axis at a constant rate of 1120 revolutions per minute. a.) Determine the angular speed of the disk in radians per second. b.) Determine the linear speed of a point 2.40 cm from the disk's center. c.) ...
*Wednesday, March 30, 2016 by Emily*

**Physics**

How do you turn revolutions into radians? Please help!
*Wednesday, March 30, 2016 by Emily*

**Physics**

A wheel has a radius of 5.22 m. a.) How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 34.3°? b.) How far does a point on the circumference travel if the wheel is rotated through an angle of 34.3 rad? c.) How far does...
*Wednesday, March 30, 2016 by Emily*

**Algebra-base Physics**

A single conservative force Fx= (6.0x-12) N, (x is in m), acts on a particle moving along the x axis. The potential energy associated with this force is assigned a value of 20J at x=0. What is the potential energy at x=3.0m?
*Wednesday, March 30, 2016 by Sasha Yazzie*

**physics**

An inquisitive physics student and mountain climber climbs a 50.0m high cliff that overhangs a calm pool of water. He throws two stones vertically downward, 1.00 s apart, and observes that they cause a single splash. The first stone has an initial speed of 2.00 m/s. (a) How ...
*Wednesday, March 30, 2016 by Anonymous*

**physics**

A radioactive source of a single nuclide emits 2.4-MeV neutrons at the rate of 9200 neutrons per second. The number of atoms in the source is 4.0 ×109. The activity of the source, in nCi, is
*Wednesday, March 30, 2016 by jay*

**nuclear physics**

Neptunium 239 93 Np has a decay constant of 3.40 ×10-6 s-1. A 3.0-mg sample of Np-239 is prepared. The activity of the Np-239 sample, in Ci, is
*Wednesday, March 30, 2016 by jay*

**Physics**

A free fall parachutist reaches a terminal velocity of 150 km/hr when dropped from a plane at a height of 10,000m. Is they terminal velocity going to be greater or smaller if they were dropped from a plane at a height of 10,000m?
*Wednesday, March 30, 2016 by Kiran*

**physics**

Neptunium 239 93 Np has a decay constant of 3.40 ×10-6 s-1. A 3.0-mg sample of Np-239 is prepared. The activity of the Np-239 sample, in Ci, is
*Wednesday, March 30, 2016 by jay*

**physics**

A proton is projected at a stationary 6238 Ni aluminum target. The proton momentarily comes to a halt at a distance from the center of an aluminum nucleus, equal to twice the nuclear radius. Assume that the nucleus retains its spherical shape and that the nuclear force on the ...
*Wednesday, March 30, 2016 by jay*

**physics**

when two resistors,R1 and R2 are in series, they have an equivalent resistance of 180 ohms, and when they are in parallel, they have an equivalent resistance of 40 ohms. what are their values?
*Wednesday, March 30, 2016 by Cassidy*

**physics**

Given a velocity time graph how do you determine when the object is moving at the lowest speed is it when V=O or when the gradient is the less steepest? Do the terms "moving at lowest speed" and "moving slowest" mean the same
*Wednesday, March 30, 2016 by Anonymous*

**physics**

the nuclei Co-57 an odd-even unstable nucleus is often used as a source of radiation in nuclear processes. Show that the nuclei is stable relative to beta plus decay by electron capture
*Wednesday, March 30, 2016 by jay*

**Physics - Constructive Interference**

A square has sides of length L. In the lower-right and lower-left corners there are two sources of light waves, one in each corner, that emit identical in-phase light waves of wavelength 8.28 m in all directions. What is the minimum value of L such that constructive ...
*Wednesday, March 30, 2016 by A*

**physics**

The froghopper Philaenus spumarius is supposedly the best jumper in the animal kingdom. To start a jump, this insect can accelerate at 4.00 km/s2 over a distance of 2.00 mm as it straightens its specially adapted“jumping legs.” Assume the acceleration is constant. (a...
*Wednesday, March 30, 2016 by Anonymous*

**Physics**

A man completes 31 lengths of a 50 metre pool with an average speed of 0.9 km/h. What is the magnitude of his average velocity vector in Standard SI units?
*Wednesday, March 30, 2016 by Nick*

**physics**

The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v=(-5.00×10^7)t^2 + (3.00×10^5)t where v is in meters per second and t is in seconds. The acceleration of the bullet just as it leaves the barrel is zero. (a) Determine ...
*Wednesday, March 30, 2016 by Anonymous*

**physics**

a mass is at rest with respect to the lab frame, while a frictionless turntable rotates beneath it. the frequency of turntable is w and mass is located at radius r. In the frame of turntable , find the forces acting on mass and verify that F=ma
*Wednesday, March 30, 2016 by Garima*

**physics**

a mass is at rest with respect to the lab frame, while a frictionless turntable rotates beneath it. the frequency of turntable is w and mass is located at radius r. In the frame of turntable , find the forces acting on mass and verify that F=ma
*Wednesday, March 30, 2016 by Garima*

**physics**

a block slides along a path that is without friction until the block reaches the section of length L = 0.75 m, which begins at height h = 2.0 m on a ramp of angle θ = 30°. In that section, the coefficient of kinetic friction is 0.40. The block passes through point A ...
*Wednesday, March 30, 2016 by Kayla*

**physics**

For the next part, you will need to know that the position d of an object attached to a spring that oscillates with period T=1.0s is a sinusoidal function of time: d=kcos(2πt)d=kcos(2πt) for some constant k. Assume that the initial position of the object is d0=2.0cm...
*Wednesday, March 30, 2016 by k*

**Physics Circuit Problem**

(dot) webassign (dot) net / s e r c p 9 / 1 8 - p - 0 2 1 - a l t . g i f Determine... (a) the current in each resistor (Indicate the direction of the current flow through each resistor through the sign of your answer. Take upward current flow as positive.) (b) the potential ...
*Tuesday, March 29, 2016 by Anonymous*

**Physics- Circuits Current & Voltage Problem**

Please find this question onto y a h o o s e a r c h e n g i n e b y c o p y & p a s t e. Determine... (a) the current in each resistor (Indicate the direction of the current flow through each resistor through the sign of your answer. Take upward current flow as positive.) (b...
*Tuesday, March 29, 2016 by Frustrated College Student*

**Physics**

At the moment of release each plane has the same speed of 186 m/s, and each tank is at the same height of 3.11 km above the ground. Although the speeds are the same, the velocities are different at the instant of release, because one plane is flying at an angle of 15.0° ...
*Tuesday, March 29, 2016 by Bel*

**PHYSICS - PLZ HELP **

Q: A 5.0 kg block is placed on top of a 10. kg block.(DIAGRAM : ww w.ux1.eiu.edu/~cfadd/1350/Hmwk/Ch05/Images/P5.74.g i f) A horizontal force of 45 N is applied to the 10. kg block and the 5.0 kg block is tied to the wall. The coefficient of friction between the moving ...
*Tuesday, March 29, 2016 by out of time*

**Physics**

Advanced electronic techniques utilize microscopic structures. Consider a single-turn solenoid in which the radius and the length of the solenoid are both of the order 10 microns, and a parallel plate capacitor in which the plate separation and the radius of the plates are ...
*Tuesday, March 29, 2016 by SomeoneSexy*

**Physics-mechanics **

A child's toy car runs off a battery that can supply 105 Wh of energy. If all losses (including friction) consume 45.0% of the energy available and the rider and car have a combined weight of 910 N, determine the height of the largest hill the child can climb in the car in...
*Tuesday, March 29, 2016 by John*

**physics**

A child of mass 54.7 kg sits on the edge of a merry-go-round with radius 2.3 m and moment of inertia 222.81 kgm2. The merrygo-round rotates with an angular velocity of 1.6 rad/s. What radial force does the child have to exert to stay on the merry-go-round? Answer in units of N.
*Tuesday, March 29, 2016 by a*

**PHYSICS**

A ball is projected horizontally with a velocity of 2.5m/s. Find its position and velocity after one second. pls show ur workings.
*Tuesday, March 29, 2016 by PEACE*

**Physics HELP!!**

The pressure increases by 1.0 x 104 N/m2 for every meter of depth beneath the surface of the ocean. At what depth does the volume of a Pyrex (bulk modulus 2.6 x 1010 N/m2) glass cube, 6.4 x 10-2 m on an edge at the ocean's surface, decrease by 5.8 x 10-10 m3? I know that I...
*Tuesday, March 29, 2016 by James Houl*

**Physics**

A mixing beater consists of three thin rods, each 10.9 cm long. The rods diverge from a central hub, separated from each other by 120°, and all turn in the same plane. A ball is attached to the end of each rod. Each ball has cross-sectional area 3.70 cm2 and is so shaped ...
*Tuesday, March 29, 2016 by Amy*

**Physics**

A pulsar is a rapidly rotating neutron star that continuously emits a beam of radio waves in a searchlight manner. Each time the pulsar makes one revolution, the rotating beam sweeps across the earth, and the earth receives a pulse of radio waves. For one particular pulsar, ...
*Tuesday, March 29, 2016 by Emily*

**PHYSICS**

1)At the instant traffic turns green, an automobile that has been waiting at an intersection of roads accelerats with 5ms-2. At the same instant a truck traveling with a constant velocity. (i) how far beyond its starting point will be automobile overtake the truck? (ii)how ...
*Tuesday, March 29, 2016 by PEACE*

**Physics**

A block of mass 0.61kg starts from rest at point A and slides down a frictionless hill of height h. At the bottom of the hill it slides across a horizontal piece of track where the coefficient of kinetic friction is 0.40. This section (from points B to C) is 4.73m in length. ...
*Tuesday, March 29, 2016 by Emily*

**Physics**

In a skating stunt known as "crack-the-whip", a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 76.7 kg and is 6.18 m from the ...
*Tuesday, March 29, 2016 by Emily*

**Physics**

A square has sides of length L. In the lower-right and lower-left corners there are two sources of light waves, one in each corner, that emit identical in-phase light waves of wavelength 8.28 m in all directions. What is the minimum value of L such that constructive ...
*Tuesday, March 29, 2016 by A*

**Physics**

A double lens system is made of +35.0 cm lens (lens #1) and a - 26.0 cm lens (lens #2). Lens #1 is placed at x = 0 cm on a meter stick and lens #2 is placed at x = 30.0 cm. Where on the meter stick will the final image be formed when looking at a distant object? s2"=f2(f1...
*Tuesday, March 29, 2016 by A*

**Physics**

A 9.37 kg monkey is hanging by one arm from a branch and swinging on a vertical circle. As an approximation, assume that the radial distance between the branch and the point where the monkey's mass is located to be 86.8 cm. As it swings through the lowest point on the ...
*Tuesday, March 29, 2016 by Emily*

**Physics**

A car travels at a constant speed around a circular track whose radius is 2.59 km. The car goes once around the track in 380 s. What is the magnitude of the centripetal acceleration of the car?
*Tuesday, March 29, 2016 by Emily*

**Physics**

At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.21 m/s, and an 75.7 kg person feels a 558 N ...
*Tuesday, March 29, 2016 by Emily*

**physics**

a girl on a swing 2m above the ground at her highest point and 1m above the ground at her lowest point. what is the girls maximum speed?
*Tuesday, March 29, 2016 by Anonymous*

**Physics**

A cyclist starts from rest and accelerates at 2m/s2, for 2second. Her velocity remains constant for the following 4second. The brakes are then applied and the bicycle decelerates uniformly until it comes to rest after 10 second. Find(a) the distance moved during each stage of ...
*Tuesday, March 29, 2016 by Physics*

**Physics**

A car is driving with a velocity of 108km/h suddenly a child crosses the road 100m in frond of the car. the driver applies brakes and comes to a stop in 5 second. Calculate the acceleration of the car
*Tuesday, March 29, 2016 by Physics*

**physics**

Why is the following situation impossible? Emily challenges David to catch a $1 bill as follows. She holds the bill vertically with the center of the bill between, but not touching David’s index finger and thumb. Without warning, Emily releases the bill. David catches ...
*Tuesday, March 29, 2016 by Anonymous*

**PHYSICS**

A GALVANOMETER WITH COIL RESISTANCE 12.0OHMS SHOWS FULL SCALE DEFLECTION FOR A CURRENT OF 2.5MA HOW WOULD YOU CONVERT IT INTO A VOLTMETER OF RANGE 0 TO 10VOLTS
*Tuesday, March 29, 2016 by ADEOSUN*

**physics**

A 3.25-kg object is attached to a vertical rod by two strings as shown in the figure below. The object rotates in a horizontal circle at constant speed 6.60 m/s. (a) Find the tension in the upper string. N (b) Find the tension in the lower string. N
*Monday, March 28, 2016 by jojo*

**Physics**

A local ice hockey team has asked you to design an apparatus for measuring the speed of the hockey puck after a slap shot. Your design is a 2.00-m-long, uniform rod pivoted about one end so that it is free to rotate horizontally on the ice without friction. The 1.70-kg rod has...
*Monday, March 28, 2016 by Frankie*

**Physics **

A 0.11-kg balloon is filled with helium (density = 0.179 kg/m3). If the balloon is a sphere with a radius of 5.4 m, what is the maximum weight it can lift?
*Monday, March 28, 2016 by Scott*

**Physics**

A 5.0 kg block is placed on top of a 10. kg block (ux1.eiu.edu/~cfadd/1350/Hmwk/Ch05/Images/P5.74.gif) . A horizontal force of 45 N is applied to the 10. kg block and the 5.0 kg block is tied to the wall. The coefficient of friction between the moving surfaces is 0.20. ...
*Monday, March 28, 2016 by physics kid*

**Physics**

Tom (65 kg) is standing on a scale in an elevator holding an apple. The elevator begins to accelerate downwards at 2.4 m/s2. (c) What is the acceleration of the apple with respect to Tom, after he drops the apple while accelerating? (d) What is the acceleration of the apple if...
*Monday, March 28, 2016 by Bubble*

**Physics**

Jay (65 kg) is standing on a scale in an elevator holding an apple. The elevator begins to accelerate downwards at 2.4 m/s2. What does the scale read during this acceleration? would it be 793 N or 481N? N=m(g-a) OR N=m(g+a)? and why plz!
*Monday, March 28, 2016 by Bubble*

**Physics**

Object A experiences a gravitational force due to object B. How would that force change if the separation distance is halved, mA triples, and mB is reduced to one quarter of its original value?
*Monday, March 28, 2016 by lost in life*

**physics steve or damon help!!!!**

A stone is thrown horizontally from the top of a vertical wall with a velocity of 15m/s hit the horizontal ground at a point 45m from the base of the wall.calculate the height of the wall g=10
*Monday, March 28, 2016 by david*

**physics**

A car drives straight down toward the bottom of a valley and up the other side on a road whose bottom has a radius of curvature of 115 m. At the very bottom, the normal force on the driver is twice his weight. At what speed was the car traveling? I have the formulas (v = 2pi*r...
*Monday, March 28, 2016 by Rain*

**Physics 110**

How much energy is needed to raise 500 grams of water from 10 degrees Celsius to 40 degrees Celsius?
*Monday, March 28, 2016 by Jennifer*

**physics**

A wave of frequency M sec-1 has a velocity of 4M m/sec. (a) How far apart are two points whose displacements are (𝑴𝟐)𝑜. apart in phase? (b) At a given point, what is the phase difference between two displacements occurring at times separated by M/1000 sec
*Monday, March 28, 2016 by Anonymous*

**physics**

two charged particles of masses 4m & m and having charges +q & +3q are placed in uniform electric field they are allowed to move for 2 sec find the ratio of their kinetic energy solution
*Monday, March 28, 2016 by Ar!@#$%^&a *

**physics**

solid sphere,thin walled hollow sphere,solid cylinder from above the ground in the same mass and radius which object reach first the ground?
*Monday, March 28, 2016 by Yonas *

**physics**

Moving with uniform acceleration a body covers 80 m in first 5s and 180m in next 5s.find initial velocity and acceleration
*Monday, March 28, 2016 by rushil*

**PHYSICS**

A 3.50 kg ball with a velocity of 10.00 m/s collides with a stationary ball with a mass of 5.00 kg. After the collision, the first ball travels at a 42.6 degree angle from its original path, while the second ball travels at a -26.7 degree angle from the other ball's ...
*Sunday, March 27, 2016 by Omar*

**physics**

what is electric field lines
*Sunday, March 27, 2016 by Awal*

**physics**

Freshwater (𝜌 = 1,020 kg/m3) is flowing in a horizontal pipe whose cross section widens from 9.0 cm2 to 13.0 cm2. The water speed at the wide section of the pipe is 1.25 m/s. What pressure difference (absolute value) is there between narrow and wide section?
*Sunday, March 27, 2016 by Anonymous*

**physics**

An electric train moving at 20kmh accelerates to a speed of 30kmh in 20 seconds.find the distance travelled in metres during the period of acceleration
*Sunday, March 27, 2016 by Awwal*

**PHYSICS**

Suppose a 1800-kg car passes over a bump in a roadway that follows the arc of a circle of radius 18.4 m as in the figure shown below. (a) What force does the road exert on the car as the car passes the highest point of the bump if the car travels at 9.24 m/s? (Neglect any ...
*Sunday, March 27, 2016 by MARY*

**physics**

Suppose a 1800-kg car passes over a bump in a roadway that follows the arc of a circle of radius 18.4 m as in the figure shown below. (a) What force does the road exert on the car as the car passes the highest point of the bump if the car travels at 9.24 m/s? (Neglect any ...
*Sunday, March 27, 2016 by mary*

**physics**

Question Part Submissions Used A 3.25-kg object is attached to a vertical rod by two strings as shown in the figure below. The object rotates in a horizontal circle at constant speed 6.60 m/s. (a) Find the tension in the upper string. N (b) Find the tension in the lower ...
*Sunday, March 27, 2016 by mary*

**physics**

Suppose a 1800-kg car passes over a bump in a roadway that follows the arc of a circle of radius 18.4 m as in the figure shown below. (a) What force does the road exert on the car as the car passes the highest point of the bump if the car travels at 9.24 m/s? (Neglect any ...
*Sunday, March 27, 2016 by maryann*

**physics**

An air puck of mass m1 = 0.24 kg is tied to a string and allowed to revolve in a circle of radius R = 1.4 m on a frictionless horizontal table. The other end of the string passes through a hole in the center of the table, and a mass of m2 = 1.3 kg is tied to it (see the figure...
*Sunday, March 27, 2016 by maryann*

**physics**

A laser beam passes from air into a 25% glucose solution at an incident angle of 37 ∘ . In what direction does light travel in the glucose solution? Assume the index of refraction of air is n = 1.
*Sunday, March 27, 2016 by james*

**Physics help me plss**

An aricraft carrier has a mass of 8.6*10^7 kg and can cruise at 80 km/h. a) What is the work required to stop it? B) If only half of the work required to stop it is done, what is its final speed in km/h For a) I found 2.123*10^10 which is the right answer but I cant find b i ...
*Sunday, March 27, 2016 by PHYSICSS PLS*

**physics**

A house with a room wall of 5m by 3m is build of bricks of 20 cm. if internal temperature is 21 degrees celcius and those outside -18 degres celcius; what is the amount of heat flow if thermal conductivity is 0.63
*Sunday, March 27, 2016 by Anonymous*

**Physics**

At the start of your throw of a 5.6-kg bowling ball, your arm is straight behind you and horizontal (Figure 1) . Your arm is 0.64 m long, has a rotational inertia of 0.48 kg⋅m2 and has a mass of 3.5 kg with its center of mass 0.28 m from your shoulder joint. Determine ...
*Saturday, March 26, 2016 by Cosmo*

**Physics help me guys **

An aricraft carrier has a mass of 8.6*10^7 kg and can cruise at 80 km/h. a) What is the work required to stop it? B) If only half of the work required to stop it is done, what is its final speed in km/h For a) I found 2.123*10^10 which is the right answer but I cant find b i ...
*Saturday, March 26, 2016 by LEXIMAHO *

**Physics**

The activity of a sample of 31Si (T1/2 = 9.43×103 s) is 7.88×105 decays per second. What is the mass of sample present?
*Saturday, March 26, 2016 by Peter*

**Applied Physics**

An object moving with a constant accleration travels distance of 20m and 24m respectively in 3rd and 4th second of its motion. Find the initial velocity and the accleration of an object
*Saturday, March 26, 2016 by Anonymous*

**Physics**

In Europe, the standard voltage is 230 V (rms), AC, and 50 cycles/s. Suppose you take your 5.00 W electric razor to Rome and plug it into the receptacle (with an adapter to fit the receptacle but not to change the voltage). (The standard voltage in the United States is 120 V (...
*Saturday, March 26, 2016 by Alyssa*

**Physics**

Particle 1 of mass 3m initially moving with a speed v0 in the positive x-direction collides with particle 2 of mass m moving in the opposite direction with an unknown speed v.After collision,particle 1 moves along the negative y-direction with speed v0/2 and particle 2 moves ...
*Saturday, March 26, 2016 by Divya*

**physics 1**

A 3.50 kg ball with a velocity of 10.00 m/s collides with a stationary ball with a mass of 5.00 kg. After the collision, the first ball travels at a 42.6 degree angle from its original path, while the second ball travels at a -26.7 degree angle from the other ball's ...
*Saturday, March 26, 2016 by i*

**physics**

Two equally long 12-cm diameter pipelines have the same pressure difference between ends. One carries a ‘Type A’ oil (𝜂 = 0.091 Pa s) and the other a ‘Type B’ oil (𝜂 = 0.064 Pa s). If ‘Type A’ oil flows at 0.14 m3/s, at which rate ...
*Saturday, March 26, 2016 by David*

**physics**

Freshwater (𝜌 = 1,020 kg/m3) is flowing in a horizontal pipe whose cross section widens from 9.0 cm2 to 13.0 cm2. The water speed at the wide section of the pipe is 1.25 m/s. What pressure difference (absolute value) is there between narrow and wide section?
*Saturday, March 26, 2016 by Morgan*