Monday

October 24, 2016
**math**

if m set of 22 mathematics teachers and p is the set of 25 physics teachers and if 2 teachers both mathematics and physics, how many elements has MUP.

*Tuesday, July 5, 2016 by jb*

**Physics**

A 20 kg slab is to be pulled up a plane inclined 20 degrees with the horizontal at a constant speed by a force that is directed 15 degrees above the surface of the inclined plane. Determine the magnitude of the force necessary to perform the task. The coefficient of friction ...

*Monday, July 4, 2016 by ylopez*

**Physics**

Randy pushes a 30.0 kg box resting on a rough surface by exerting a force of 85.0 N. The box did not move. What is the coefficient of static friction between the box and the surface where it lies?

*Monday, July 4, 2016 by ylopez*

**Physics**

A box with a mass of 10 kg slides along a horizontal surface. A force of 50 N is needed to keep it moving. What is the coefficient of kinetic friction?

*Monday, July 4, 2016 by ylopez*

**Physics**

When a force of 500 N pushes on a 25-kg box, the acceleration of the box up the incline is 0.75 m/s^2. If the inclined plane makes an angle of 40 degrees relative to the horizontal level, what is the coefficient of kinetic friction?

*Monday, July 4, 2016 by ylopez*

**Physics**

How do I figure out how long it takes two runners to have the same momentum if I am given a, m, and Vi for both runners? Runner A= 85kg, 2ms-2, Vi=1ms-1 Runner B= 65kg, 3ms-2, Vi=0ms-2 I don't want an answer, just which equations to use or a hint.

*Monday, July 4, 2016 by Cam*

**Physics**

A ring (hollow cylinder) of mass 2.89kg, inner radius 5.35cm, and outer radius 6.35cm rolls (without slipping) up an inclined plane that makes an angle of θ=35.6°, as shown in the figure below. At the moment the ring is at position x = 1.87m up the plane, its speed is...

*Monday, July 4, 2016 by Tim*

**Physics**

An unknown mass of a certain solid, initially at 60⁰C, is heated at a uniform at a uniform rate. After 4.0 min the solid reaches its melting point of 80⁰C, and it remains at that temperature for 3.0 min until completely melted. After a further 6.0 min of heating, ...

*Monday, July 4, 2016 by John Carlo *

**Physics **

In physics what does ω unit represent? rad/s ???

*Monday, July 4, 2016 by Boboerto*

**Physics**

Q. A mass is sliding down an incline. As the angle for the incline increases, the magnitude of the component of weight perpendicular to incline:- Increases Decreases Increase then decrease Decrease then increase

*Monday, July 4, 2016 by SAGAR*

**Physics**

Q. The time period of seconds pendulum in a free falling elevator is Zero 1s 2s Infinity Depends upon mass of pendulum

*Monday, July 4, 2016 by SAGAR*

**Physics**

An ion beam has a cross-sectional of 2.5 mm^2 and the charge delivered by it to a target can be expressed as q(t)=(.12 C/s^3)t^3 + (.24 C/s^2)t^2 - .45 C. Calculate the current density in the beam at t = 3.0 seconds. I used an integral from 0 to 3s. and got 3.24C, then I ...

*Monday, July 4, 2016 by Zabe*

**Physics**

A 6.0 V battery is being used to charge a 5.0x10^-6 F capacitor through a resistor R. The capacitor attains a potential difference of 3.6 V in 1 second after the charging begins. The value of the resistance R is? Been stuck on this for a while and if anyone can point me into ...

*Monday, July 4, 2016 by Zabe*

**physics**

a uniform rod 100cm long and weighing 50N is supported in a horizontal position on a fulcrum with weights 80N and 100N suspended from its end. compute the position of a fulcrum.draw the illustration.

*Monday, July 4, 2016 by joshua*

**physics**

A flywheel is rotating at speed of 1200 rpm its angular acclaration is 4 rad/s how many rotation it will be done before coming to rest

*Sunday, July 3, 2016 by Rushi mudgal*

**Physics**

I've tried everything and can't come up with the correct answer. Help! A liter of water has a mass of 1 kg and the mass of a water molecule is 18 amu. How many molecules of water are there in 4 L of water?

*Sunday, July 3, 2016 by John*

**Physics**

In the figure, a small 0.125 kg block slides down a frictionless surface through height h = 0.958 m and then sticks to a uniform vertical rod of mass M = 0.250 kg and length d = 2.32 m. The rod pivots about point O through angle θ before momentarily stopping. Find θ.

*Sunday, July 3, 2016 by Andy*

**Physics**

The terminal voltage of a battery is 5.0V when 0.55A current is drawn from it, whereas the terminal voltage is 5.7V when a current of 0.180A is drawn. The emf of the battery is? The formula I used was V_(ab) = Emf - I*r First finding the r by taking the differences of voltage ...

*Sunday, July 3, 2016 by Amid*

**Physics**

An ion beam has a cross-sectional of 2.5 mm^2 and the charge delivered by it to a target can be expressed as q(t)=(.12 C/s^3)t^3 + (.24 C/s^2)t^2 - .45 C. Calculate the current density in the beam at t = 3.0 seconds. I used an integral from 0 to 3s. and got 3.24C, then I ...

*Sunday, July 3, 2016 by Amid*

**Physics**

Find the torque on the meter stick for each situation. Ignore the mass of the meter stick. At 1/2 meter there is a 1000g weight. At 1 meter on the same stick there is a 500g weight. What is the torque? Not understanding how to come up with this answer. Keep getting it wrong.

*Sunday, July 3, 2016 by John*

**Physics**

I've looked at other questions posted like this and can't understand the problem or any of the answers. Could someone please show how to find for Cliff and Will? Cliff and Will are carrying a uniform 2.0m board of mass 75kg. Will is supporting the board at the end ...

*Sunday, July 3, 2016 by Katie*

**physics**

Cliff and Will are carrying a uniform 2.0m board of mass 75kg. Will is supporting the board at the end while cliff is 0.6m from the other end as shown in the following figure. Cliff has attached his lunch to his end of the board, and the tension in the string supporting the ...

*Sunday, July 3, 2016 by Leslie*

**Physics**

What mass would you hang on the right side of the system in the figure to balance it -- that is, to make the clockwise and counterclockwise torques equal? (Let x1 = 33 cm and x2 = 12 cm.)

*Sunday, July 3, 2016 by Annabelle*

**Physics**

A car comes to a stop in 6s from a velicity of 30m/s. what is its acceleration? At the same acceleration, how long would it take the car to come to a stop from a velocity of 40m/s?

*Sunday, July 3, 2016 by Laarni jhuzel Navidad*

**physics**

4N force applied on a body mass 20kg then calculate work done in 3sec?

*Sunday, July 3, 2016 by rohit*

**Physics**

An 11N force acting due north and a 22-N force acting 30° North of east act concurrently on a point. What is the equilibrant force at that point? I'm having such a hard time.=(

*Saturday, July 2, 2016 by Marvin*

**PHYSICS**

a block of a material of volume 20cmand density 2.5cm is suspended frm a spring balance wit half of the vol of the block immersed in a water,what is the reading of a spring balance?

*Saturday, July 2, 2016 by ZAKKA*

**Physics**

What % increase in momentum if increase of k.e is 23% A. 46% B. 33% C. 50% D. 11% E. 46%

*Saturday, July 2, 2016 by SAGAR*

**physics**

Rain drops fall on a tile surface at a density of 4585 drops/ft2 . There are 15 tiles/ft2 . How many drops fall on each tile? Answer in units of drops/tile.

*Saturday, July 2, 2016 by imani*

**physics**

A novice captain is pointing his ferryboat directly across the river at a speed of 15.7 mi/h. If he does not pay attention to the current that is headed downriver at 5.35 mi/h, what will be his resultant speed and direction? (Consider that the current and the boat’s ...

*Saturday, July 2, 2016 by hassan yousif*

**Physics**

A planet with density equal to Earth is 2R times far away from earth, if we double the distancs from 2R to 4R then "g" becomes:-

*Saturday, July 2, 2016 by Sagar*

**physics**

A swimming pool of width 9.0 m and lenght 24.0 mis filled with water to a deepth of 3.0 m force 1215 m.Calculate pressure on the bottom of the pool due to the water

*Saturday, July 2, 2016 by Deek!@#$%^&haa*

**physics**

Two forces 5N &10N are acting at an angle of 120° between them. Find the resultant force in magnitude and direction.

*Saturday, July 2, 2016 by sai*

**physics**

As a movie stunt coordinator, you need to be sure a stunt will be safe before it is performed. If a stunt- woman is to run horizontally off the roof of a three-story building and land on a foam pad 7.35 m away from the base of the building, how fast should she run as she ...

*Saturday, July 2, 2016 by hassan yousif*

**physics**

As a newspaper delivery boy, Jason needs to know his projectile motion to throw a paper horizontally from a height of 1.40 m to a door that is 13.5 m away. What must the paper’s velocity be for it to reach the door?

*Saturday, July 2, 2016 by hassan yousif*

**physics**

A novice captain is pointing his ferryboat directly across the river at a speed of 15.7 mi/h. If he does not pay attention to the current that is headed downriver at 5.35 mi/h, what will be his resultant speed and direction? (Consider that the current and the boat’s ...

*Saturday, July 2, 2016 by hassan yousif*

**Physics**

A potter's wheel—a thick stone disk with a radius of 0.420m and a mass of 120kg—is freely rotating at 53.0rev/min. The potter can stop the wheel in 5.50s by pressing a wet rag against the rim and exerting a radially inward force of 79.4N. Calculate the effective ...

*Saturday, July 2, 2016 by Tim*

**Physics/Chem**

A cube of aluminum 24.0 cm on each side is cooled from 128 °C to 20 °C. If the energy removed from the aluminum cube were added to a copper cube of the same size at 30 °C, what would be the final temperature of the copper cube?(ρAl = 2700 kg/m³; ρ...

*Friday, July 1, 2016 by Jeff Kinka*

**Physics/Chem**

an experiment, a 0.280-kg piece of ceramic superconducting material at 23 °C is placed in liquid nitrogen at its boiling point (−195.8 °C) to cool. The nitrogen is in a perfectly insulated flask that allows the gaseous N2 to escape immediately. How much mass of ...

*Friday, July 1, 2016 by Jeff Kinka*

**Physics**

What is the rotational speed of the Second Hand on a clock. Note, the answer must be in rev/s. The Hour Hand is 2.31e-05 rev/s; The Minute Hand is 2.78e-4 rev/s. I've checked with 3 tutors and none of them have gotten an answer that is considered correct. I'm ...

*Friday, July 1, 2016 by Annabelle*

**physics**

If an hour hand is .01667 rev/s, a minute hand is 2.78e-4 rev/s, what is the second hand rotation speed? I've tried everything and can't get a correct answer. Thank you

*Friday, July 1, 2016 by Anna*

**physics**

To protect her new two-wheeler, Iroda Bike buys a length of chain. She finds that its linear density is 0.62 lb/ft. If she wants to keep its weight below 1.6 lb, what length of chain is she allowed? Answer in units of ft.

*Friday, July 1, 2016 by imani*

**physics**

A plastic tube allows a flow of 11.3 cm3 /s of water through it. How long will it take to fill a 245 cm3 bottle with water? Answer in units of s

*Friday, July 1, 2016 by imani*

**physics**

A group of soldiers walked 15km north from their camp then covered 10km more due east. 1. What is the total distance walked by the soldiers? 2. Define the displacement?

*Friday, July 1, 2016 by geobon*

**physics**

The angle of elevation of a tree at a place 80m away is 12 degree 5 minute.what is a height of tree?

*Friday, July 1, 2016 by yash patwa*

**Physics**

A stone is dropped from the root of a building. A person in the building observes that the stone crosses his window that is 2 meters tall in a time of 0.2 second. How far is the roof from the top of the window?

*Thursday, June 30, 2016 by Joe*

**physics**

A cyclist is attached to a rope which is looped over a pulley (disc of mass 10kg and radius 0.5m). The rope is then attached to a hanging block of mass 5kg. What force must the cyclist generate such that the block will move with an acceleration of 2.25 m/s2. Let’s make ...

*Thursday, June 30, 2016 by sam*

**science (physics)**

how far will a stone travel over level ground if it is thrown upward at an angle 30 with the horizontal and with a speed of 12m/s?what maximum range could be achieved with the same initial speed?

*Thursday, June 30, 2016 by tena*

**science physics**

a force acted upon a body by 3 given force is under equilibrium if f1 =10n and f2 =6n find f3 and angle

*Thursday, June 30, 2016 by vaani*

**physics**

A ball reaches the ground at 6 seconds when thrown vertically upwards from the top of a tower with an inoitial velocity 24m/s. Find the height of the tower.

*Thursday, June 30, 2016 by kowalski*

**physics**

A cyclist is attached to a rope which is looped over a pulley (disc of mass 10kg and radius 0.5m). The rope is then attached to a hanging block of mass 5kg. What force must the cyclist generate such that the block will move with an acceleration of 2.25 m/s2. Let’s make ...

*Thursday, June 30, 2016 by sam*

**physics**

The contestants at a cycling race travel around a 0.5km radius track. The peloton travels 33 laps in 1 hour to complete the race. What is the total angular distance they have traveled? On the first lap, they start from rest and after traveling ½ the circumference of the...

*Thursday, June 30, 2016 by dave*

**physics**

A cyclist is on a rolling stationary trainer pedaling such that his wheels are traveling at 30 km/h. He has an unfortunate incident and ends up falling over 90° on his side onto a large patch of ice. Given the cyclist and bicycle have an 4.5 kg*m^2, find the angular ...

*Thursday, June 30, 2016 by joe*

**physics**

A particle A having a charge of 2×10^-6 Coulomb and a mass of 100g is fixed at the bottom of a smooth inclined plane of inclination 30 degree. Where should another particle B having same charge and mass, be placed on the inclined plane so that B may remain in equilibrium...

*Thursday, June 30, 2016 by anonymous 111*

**physics**

A motorcycle/rider combination has a center of mass that is half a meter diagonally upward and in front of the point of contact between the wheel and the road at an angle of 30 degrees when the bike is level. What acceleration is necessary to keep the bike tilted up stably ...

*Wednesday, June 29, 2016 by Anonymous*

**Physics**

A 0.2kg toy car rolls down a ramp with a height of 0.7m. What is the speed of the car at the bottom of the ramp. At the bottom it hits a stationary car with a mass of .4 kg. The two cars have velcro bumpers and stick together. At what speed do the two cars move after the ...

*Wednesday, June 29, 2016 by Anna*

**Physics**

Calculate the formula for coefficient of kinetic friction in an inclined plane with a pulley and two masses coonected by a rope. You can only use the weight of the two masses, the height where the second object is and the distance that the first object does and the angle of ...

*Wednesday, June 29, 2016 by Nelson*

**Physics**

A satellite orbits the Earth with a radius of 7000km. The acceleration of gravity at this distance=8.17m/s/s. How do I find the velocity of the satellite? I'm really struggling with finding the correct formula. I know the answer but can't figure out how to get there. ...

*Wednesday, June 29, 2016 by Leslie*

**physics**

a stone is projected vertically upward and reaches a maximum height of 20m before it returns to the thrower find the total time taken

*Wednesday, June 29, 2016 by gunjan*

**Physics**

A rock falls off the edge of a cliff that is 145 m above the ground beneath it. For how long a time is the rock falling? Assume air resistance is negligible. A. 4.9 s B. 2.9 s C. 4.5 s D. 3.3 s E. 5.4 s

*Wednesday, June 29, 2016 by Karri*

**Physics**

What is the acceleration of a car that goes from 20 to 30 km/h in 1.5s? At the same acceleration, how long will it take the car to go from 30 to 36 km/h?

*Wednesday, June 29, 2016 by Yoongi*

**Physics**

I'm really struggling trying to understand what formulas to use for the following: A satellite orbits the earth with a radius of 7000 km. (a) what is the acceleration of gravity at this distance? (b) what is the velocity of the satellite? (c) how long does it take the ...

*Wednesday, June 29, 2016 by Anna*

**Physics**

What is the acceleration of a car that goes from 20 to 30 km/h in 1.5s? At the same acceleration, how long will it take the car to go from 30 to 36 km/h?

*Tuesday, June 28, 2016 by Yoongi*

**Physics**

I'm really struggling trying to understand what formulas to use for the following: A satellite orbits the earth with a radius of 7000 km. (a) what is the acceleration of gravity at this distance? (b) what is the velocity of the satellite? (c) how long does it take the ...

*Tuesday, June 28, 2016 by Anna*

**Physics**

An object moves with constant acceleration 4.20 m/s2 and over a time interval reaches a final velocity of 10.4 m/s. (a) If its original velocity is 5.20 m/s, what is its displacement during the time interval?

*Tuesday, June 28, 2016 by Tulsi*

**Physics**

A cube of side L is place in a uniform electric field E = 3200 N/C. What is the net flux through the cube. Assume the electric field lines are parallel with the edges of the cube. Make sure you know why this is the answer. I know its not perpendicular or at an angle So if it...

*Tuesday, June 28, 2016 by Laura*

**Physics**

How much kinetic energy does the electron gain?

*Tuesday, June 28, 2016 by Anonymous*

**Physics**

What is the final temperature when 8.0 x 105 J are added to 1.50 kg of ice at 0.0 °C?

*Monday, June 27, 2016 by Winsome*

**Physics**

A flat-topped toy cart moves on frictionless wheels, pulled by a rope under tension T. The mass of the cart is m1. A load of mass m2 rests on top of the cart with the coefficient of static friction μs between the cart and the load. The cart is pulled up a ramp that is ...

*Monday, June 27, 2016 by Weasley*

**Physics**

A 4.0-kg block slides down an inclined plane that makes an angle of 25° with the horizontal. Starting from rest, the block slides a distance of 2.5 m in 5.4 s. Find the coefficient of kinetic friction between the block and plane.

*Monday, June 27, 2016 by Maddie*

**physics**

a particle starts moving from rest with uniform acceleration . it travels a distance y in the next 2 sec

*Monday, June 27, 2016 by kpavaniswetha*

**physics**

Two mirrors are inclined at each other such that a ray of light incident on the 1st mirror and parallel to the 2nd mirror is reflected from the 2nd parallel to the 1st mirror.Determine the angle between the mirrors and the deviation suffered by the incident ray.

*Monday, June 27, 2016 by maina*

**physics**

In a city grid, each block on the east-west streets is 180 meters long. Each block on the north-south streets is also 180 meters long. A walker walks 4 blocks north and then 3 blocks east. How much farther did the walker travel than the actual distance between the start and ...

*Monday, June 27, 2016 by Shelby*

**physics**

a car travelling at 60km/h uniformly retards for 10s and reaches a velocity of 45km/h. find the retardation.

*Monday, June 27, 2016 by Anonymous*

**physics**

an object undergoes an acceleration of 10m/s2 starting from rest. find the distance travelled by it in seconds

*Monday, June 27, 2016 by Anonymous*

**physics**

what is the scientific n otation of 75mm to inches?

*Monday, June 27, 2016 by allal*

**physics**

A piccolo and a flute can be approximated as cylindrical tubes with both ends open. The lowest fundamental frequency produced by one kind of piccolo is 508.7 Hz, and that produced by one kind of flute is 220.3 Hz. What is the ratio of the piccolo's length to the flute'...

*Sunday, June 26, 2016 by nop*

**Physics**

A bat strikes a 0.145-kg baseball. Just before impact, the ball is traveling horizontally to the right at 47.0 m/s ; when it leaves the bat, the ball is traveling to the left at an angle of 31.0 ∘ above horizontal with a speed of 58.0 m/s . The ball and bat are in ...

*Sunday, June 26, 2016 by Jordan*

**Physics**

A uniform ladder of mass (m = 14.5 kg) and length (L) leans against a frictionless wall, see figure. Find the static friction force between the ladder and the floor if the angle θ = 64.0°?

*Sunday, June 26, 2016 by Ryan Keefe*

**Physics: Oscillations and spring constant**

A student measured 15s for the 20 complete oscillations for an object of 200g attached at the free end of a spring. Calculate the period of oscillation (T) and the spring constant (k). My work (just wanted to ask for opinions if this is right): T = 2π√(m/k) T = 20 ...

*Sunday, June 26, 2016 by Jenna*

**Physics**

I've figured out the first part that the v is 1.25 m/s, but even with that knowledge can't determine how to calculate the horizontal distance. Can someone help with a formula? You let a ball roll from rest from the top of a ramp sitting on a table. If the top of the ...

*Sunday, June 26, 2016 by Anna*

**Physics **

At what displacement the instantaneous velocity become equal to half of its maximum velocity? Plz help me

*Sunday, June 26, 2016 by Ali*

**physics**

a particle executing shm time period t from mean position the time to complete 5/8 oscillation

*Sunday, June 26, 2016 by rachel*

**Physics **

A car moves for half of its time at 80km/hr and for rest half of time at 40km/hr.The total distance covered is 60km.What is the average speed of the car?

*Saturday, June 25, 2016 by Aadithya*

**Physics **

A bullet moving at 20m/sec strikes a wooden plank and penetrates 4cm before coming to stop.The time taken to stop is?

*Saturday, June 25, 2016 by Aadithya*

**Physics**

A spring that has a force constant of 1200 N/m is mounted vertically on the ground. A block of mass 1.60 kg is dropped from rest from height of 1.50 m above the free end of the spring. By what distance does the spring compress?

*Saturday, June 25, 2016 by Jeff Kinka*

**Physics**

A uniform ladder of mass (m = 14.5 kg) and length (L) leans against a frictionless wall, see figure. Find the static friction force between the ladder and the floor if the angle θ = 64.0°?

*Saturday, June 25, 2016 by Jeff Kinka*

**Physics**

Completely lost on what formula to use: A 50 gram ball enters a pendulum with mass 200 g. The pair then swings up to a height of 12 cm. Find the velocity at which the pair move immediately after the collision. Find the initial velocity of the ball before the collision. ...

*Saturday, June 25, 2016 by Leslie*

**physics**

A block and tackle system of 5 pulleys is used to raise a load of 50kg through a height of 20m the work done against friction is 200J.Calculate the work done by effort,the efficiency of the system and the effort applied.

*Saturday, June 25, 2016 by Mohamedy*

**physics**

find the relative velocity of boat w.r.t water .The velocity of boat is 3i^+4j^ and that of the water is -3i^-4i^

*Saturday, June 25, 2016 by gaurav*

**physics**

A boy moves 400m towards north 300m towards west and again 400m towards south calculate displacement of the boy from initial position

*Saturday, June 25, 2016 by rom*

**Physics **

What is net capacitance if maximum potential is 40 volt and instant charge is 60 coulomb.?

*Saturday, June 25, 2016 by Anonymous*

**Physics**

A 7.25 μC and a -2.00 μC charge are placed 20 cm apart. Where can a third charge be placed so that it experiences no net force. Express your answer in cm. The answer is 22.12 from the online answer key, but how do you set this up?

*Friday, June 24, 2016 by Kim*

**physics 1**

If the position of an object is given by x = 2.00t^3, where x is measured in meters and t in seconds, find (a) the average velocity and (b) the average acceleration between t = 1.0 s and t = 2.0 s. Then find (c) the instantaneous velocity v and (d) the instantaneous ...

*Friday, June 24, 2016 by lolo*

**physics**

an atom is placed in a uniform magnetic induction B. such that its plane normal to the electron orbit makes an angle of 30 degrees with the magnetic induction the torque acting on the orbiting electron?

*Friday, June 24, 2016 by manu*

**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, June 24, 2016 by Aadi*

**Physics **

On a day that is 30°c, you drop a rock from the top of a well. You hear the sound of the rock hitting the bottom 0.6s after you drop it. How deep is the well?

*Thursday, June 23, 2016 by Anonymous*

**Physics**

A satellite orbits at a distance from the Earth's center of abut 3.00 earth radii and takes 7.30 hours to go around once. What distance (in meters) does the satellite travel in one day? And, what is the orbital velocity (in m/s)? I'm completely lost. I haven't ...

*Thursday, June 23, 2016 by Leslie*

**Physics**

the diameter of the moon is 3.48x10^3 km. what is its surface area in m2?

*Thursday, June 23, 2016 by hi*

**Physics**

A square 1 m on its side has charges on every corner. Calculate the electric field on the upper right corner of the square. Let the charge on each corner be 40 x10-9C. Do I use K(Q*4)/r^2=F Then F/(Q*4)=E K=8.99*10^9 Nm^2/C^2

*Thursday, June 23, 2016 by Kim*