Tuesday

October 6, 2015
**physics**

What is the radius of an automobile tire that makes a complete turn in 0.1 sec and has a linear speed of 24.0 m/s?
*Tuesday, June 4, 2013 by Jack*

**physics**

Two identical twins, Amy and Beatrice, are on top of two different slides, one on each slide. Both slides start 3 m above the ground and end 0.5 m above the ground. Amy's slide is a straight, 45 degree slide with height given by h=−x+3 (so it starts at x=0 with a ...
*Tuesday, June 4, 2013 by keshav*

**physics**

In the movie Spiderman 2, there's a famous minute long scene where Spiderman stops a train. If the initial speed of a five car out of control subway train was around the top speed of the NYC subway (27 m/s), and Spiderman stopped the train in exactly one minute, then what ...
*Tuesday, June 4, 2013 by keshav*

**physics**

The dipole moment for a system of charges is defined as d⃗ =∑kqkr⃗ k. (see here for a more in depth discussion of the dipole moment). Determine the magnitude of the dipole moment in m⋅C for a system of three charges (Q=1 μC, Q=1 μC, and −...
*Tuesday, June 4, 2013 by keshav*

**physics**

Workers who wash windows or paint the outside of buildings use an interesting contraption known as a painter's lift. This consists of a harness that the worker wears suspended by a rope. The rope runs through a pulley mounted on the roof of the building and back down to ...
*Tuesday, June 4, 2013 by keshav*

**physics**

If the same shoe were dropped from a height of 40m, how many seconds would it take it to hit the floor?
*Tuesday, June 4, 2013 by frank*

**physics**

Three objects of same heat capacity with temperature T1=200 K, T2=400 K and T3=400 K exchange heat with each other. They are isolated from the rest of the universe. Find the highest possible temperature one of them can reach in kelvin.
*Tuesday, June 4, 2013 by j*

**Physics **

A 5.0 kg block moving east with speed of 6 kg m/s collides head on with another 8.0 kg block moving west with speed of 4 m/s. After the collision the 5.0 kg block was moving west with speed of 5 m/ s while the 8.0 kg block was moving east. a) What is the speed of the 8.0 kg ...
*Tuesday, June 4, 2013 by Huda *

**Physics**

A car is stopped at a traffic light. When the light turns green, the driver accelerates so that the car is going 10 m/s after 5s. What is the car’s average acceleration?
*Monday, June 3, 2013 by Heather*

**Physics**

The beat frequency is 8Hz. What is f2 if f1 is 350Hz? F2=350Hz +/- 8Hz = 342Hz or 358Hz. If the beat frequency increases at 340Hz then it means that f2 must be 358Hz. Why??
*Monday, June 3, 2013 by Crystal*

**Physics**

A particular spring has a force constant of 2.6×103 . Part A How much mass would have to be suspended from the vertical spring to stretch it the first 5.6 ? Express your answer using two significant figures. How much more mass would have to be suspended from the vertical...
*Monday, June 3, 2013 by Anonymous*

**physics**

A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.845 m/s encounters a rough horizontal surface of length scripted l = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant ...
*Monday, June 3, 2013 by Melissa*

**Physics**

The velocity of a vehicle is uniformly reduced from 72km/h to 24km/ over a distance of 250m down a decline of 1:25 the mass of the vehicle is 1.5Mg and its tractive resistance is 400N. The retardation is uniform. Calculate the total constant braking force required so I found ...
*Monday, June 3, 2013 by anon*

**physics **

errors involved in measurement of side and mass of cube are 3% and 4% respectively. what is the maximum error in the density of cube?
*Monday, June 3, 2013 by Mini*

**physics**

2 balls of clay , the first of mass 0.5kg,the other of mass 0.75kg approach each other ,each travels with a velocity of 0.5m\s,after the collision they stick together,what is the total energy after collision .Obtain the coefficient of restitution.
*Monday, June 3, 2013 by samuel*

**PHYSICS**

Two point charges q1 &q2 seperated by a distance of 3.0 m experience a mutual force of 16x10^-15N.Calculate the magnitude of charge when q1=q2=q. What will be magnitude of force if seperation between the charges is changed to 6.0m?
*Monday, June 3, 2013 by Megha*

**PHYSICS**

When a wire of lenght 5m & radius 0.5mm is stretched by a load of 49N,the elongation produced in the wire is 0.1cm. Find the energy stored per unit volume of the wire.
*Monday, June 3, 2013 by Megha*

**Physics**

Two rods of equal length have same temperature differences between their ends. If their thermal conductivities are K1 & K2 & their areas of cross section are A1 &A2 respectively,find the condition that will ensure equal rates of flow of heat through both the rods.
*Monday, June 3, 2013 by Megha*

**physics**

A generator has a terminal voltage of 102V when it delivers 10.3 A, and 92 V when it delivers 31.9 A. Calculate the emf. Answer in units of V
*Sunday, June 2, 2013 by Anonymous*

**physics**

In the movie Spiderman 2, there's a famous minute long scene where Spiderman stops a train. If the initial speed of a five car out of control subway train was around the top speed of the NYC subway (27 m/s), and Spiderman stopped the train in exactly one minute, then what ...
*Sunday, June 2, 2013 by help*

**Physics**

At sea level and 303 k, a rubber balloon is inflated with hydrogen gas to a diameter of 3.00 ft and an internal pressure of 16.7 lb/in scuared. Find the diameter of the balloon at an altitude of 30000 ft where the internal pressure is 6.4lb/in scuared and the temperature is 238k.
*Sunday, June 2, 2013 by Esther*

**Physics**

A pinhole camera has a small circular aperture of diameter D. Light from distant objects passes through the aperture into an otherwise dark box, falling on a screen at the other end of the box. The aperture in a pinhole camera has diameter D = 0.600 mm. Two point sources of ...
*Sunday, June 2, 2013 by Brittany *

**physics**

a person stands in the center of a frozen pond wearing ice skates. his total weight including his skates is 400 n. he pushes on of his 20 n skates forward at 10 m/s. what is his velocity?
*Sunday, June 2, 2013 by Anonymous*

**physics**

a person stands in the center of a frozen pond wearing ice skates. his total weight including his skates is 400 n. he pushes on of his 20 n skates forward at 10 m/s. what is his velocity?
*Sunday, June 2, 2013 by Anonymous*

**physics**

a balloon is rising up with acceleration of 25m per hour second square a body is dropped from the balloon when its upward velocity is 300m/s what are the values of velocity and the acceleration of the body at the instant it is dropped ?
*Sunday, June 2, 2013 by tuhituhi*

**physics**

on turning a corner a motorcyclist rushing at 44 m/s. finds a child on the road 100 m away. he applies the brake so as he stops the motorcycle within 1m of the child. calculate the time required to stop?
*Sunday, June 2, 2013 by tuhituhi*

**physics**

When a wire of length 5m and radius 0.5mm is stretched by a load of 49N,the elongation produced in wire is 0.1cm. Find the energh stored per unit volume of the wire.
*Sunday, June 2, 2013 by Pritam*

**physics**

A ball is released from a tower at a height of 100 meters toward the roof of another tower that is 25 meters high. The horizontal distance between the two towers is 20 meters. With what horizontal velocity should the ball be imparted so that it lands on the rooftop of the ...
*Sunday, June 2, 2013 by ashley*

**Physics**

2-A 10.0 Kg block is released from point A in the figure below. The block travels along a smooth frictionless track except for the rough 1 m long portion between points B and C. It makes a collision with stationary 10 kg ball after passing point C. The ball moves forward with ...
*Sunday, June 2, 2013 by Maryam*

**Physics**

1- A 5.0 kg block moving east with speed of 6 m/s collides head on with another 8.0 kg block moving west with speed of 4 m/s. After the collision the 5.0 kg block was moving west with speed of 5 m/s while the 8.0 kg block was moving east. a) What is the speed of the 8.0 kg ...
*Sunday, June 2, 2013 by Maryam*

**physics**

A tunable capacitor (with variable capacitance) is charged by a U0=12 V battery and then is connected in parallel to a R=3 Ω resistor. The capacitance C(t) of the capacitor is controlled so that the current in the circuit remains constant at all times. What is the power (...
*Sunday, June 2, 2013 by ded*

**Physics**

An airplane of a certain density and shape flies at a constant speed. To do so, it must fly with a certain velocity v0. If the size of the airplane is scaled up in length, width, and height by a factor of two, it can only fly above a new velocity v1. What is v1/v0?
*Saturday, June 1, 2013 by Carlos*

**Physics 1 College Level**

A planet/moon has a mass of 77.89 × 1023 kg and a radius of 7.9 × 106 meters. What is g on the surface to the nearest hundredth of a m/s2? Once again, not really sure where to go with this. Out of the 10 problems I've only had trouble with this and one other.
*Saturday, June 1, 2013 by Devin*

**Physics 1 College Level**

If D = 3204 meters and d = 1247 meters in the figure, what is the magnitude of the force on the space ship to the nearest MN? Consider all three to be point masses. I'm not even sure to begin with this question. Any help will be much appreciated!
*Saturday, June 1, 2013 by Devin*

**physics**

The specific heat capacity is 1800 J/Kg/K .Calculate the amount of energy liberated when 7kg of the liquid cools from 70 Degrees Celcius to 35 degrees celcius
*Saturday, June 1, 2013 by zaheer*

**physics**

Vector C has a magnitude 25.8 m and is in the direction of the negative y axis. Vectors A and B are at angles α = 41.9° and β = 27.2° up from the x axis respectively. If the vector sum A B C = 0, what are the magnitudes of A and B?
*Saturday, June 1, 2013 by helpp*

**physics**

Vector C has a magnitude 25.8 m and is in the direction of the negative y axis. Vectors A and B are at angles α = 41.9° and β = 27.2° up from the x axis respectively. If the vector sum A B C = 0, what are the magnitudes of A and B?
*Saturday, June 1, 2013 by helpp*

**physics**

When serving, a tennis ball is almost motionless when it is slammed by the racquet. A force sensor in an experimental tennis racquet measures a force of 80 N during the impact with a 0.058 kg tennis ball. The impact lasts for 0.04 seconds. If the ball was at rest initially, ...
*Saturday, June 1, 2013 by Anonymous*

**Physics**

A crate of eggs is located in the middle of the flat bed of a pickup truck as the truck negotiates a curve in the flat road. The curve may be regarded as an arc of a circle of radius 37.9 m. If the coefficient of static friction between crate and truck is 0.550, how fast can ...
*Saturday, June 1, 2013 by Josie*

**physics**

Q.an aluminium can of mass 200gm contains 500gms of water at 50c.an ice cube of mass 50gms,initially at a temperature of -20c is thrown into the can of water. i.what is the final temperature onces the ice metls and comes into equilibrium? ii.now a 200gm piece of Iron whose ...
*Saturday, June 1, 2013 by rosy*

**physics**

Q.A cube of wood 20cm on each side,floats in water so that 30% is above the surface of the water,and 70% is below. i.what is the density of the wood(justify the answer) ii.what mass of lead mass has to be placed on the top of the block of wood,so that it with just be totally ...
*Saturday, June 1, 2013 by milky*

**physics**

Q.a cube of wood 20cm on each side,floats in water so that 30% is above the surface of the water,and 70% is below.what is the density of the wood(justify the answer) i.what mass of lead mass has to be placed on the top of the block of wood,so that it wi;; just be totally ...
*Saturday, June 1, 2013 by bindas*

**heeelp tooough physics**

A tunable capacitor (with variable capacitance) is charged by a U 0=12 V battery and then is connected in parallel to a R=3 Ω resistor. The capacitance C(t) of the capacitor is controlled so that the current in the circuit remains constant at all times. What is the power...
*Saturday, June 1, 2013 by andrew*

**physics**

A car covers a distance of x,while moving at 54km/1 in 15sec.Find the value of x
*Saturday, June 1, 2013 by Navneet*

**physics**

The resultant of two forces,one is double in magnitude than the other,is perpendicular to smaller force.What is the angle between the two forces?
*Saturday, June 1, 2013 by abdul hameed*

**physics**

A rock is suspended by a light string. When the rock is in air, the tension in the string is 43.8 . When the rock is totally immersed in water, the tension is 26.2 . When the rock is totally immersed in an unknown liquid, the tension is 18.8 .
*Friday, May 31, 2013 by lungani*

**physics**

A large truck (m=3300kg) accelerates from 15 m/s. Neglecting any friction or air resistance, find the average mechanical power that the trucks engine must supply.
*Friday, May 31, 2013 by Stacy*

**Physics**

Can anyone write a mathematical equation to represent Charles law?
*Friday, May 31, 2013 by Schylar*

**physics**

the speed of 90 hm/hr is equal to.... m/s
*Friday, May 31, 2013 by arowosafe*

**physics**

the speed of 90 hm/hr is equal to.... m/s
*Friday, May 31, 2013 by arowosafe*

**physics**

a trailer is pulling acar with a force of 900N on a level road. The car is moving at 70km/h, how much work is done by the trailer on the car in 15mm?
*Friday, May 31, 2013 by taiwo*

**physics Elena please verify **

If the resistance between the center and the outer terminal on a 20 k ohm potentiometer reads 12 k ohms, the resistance between the center terminal and the other outer terminal is i have 12kohms
*Friday, May 31, 2013 by Adam*

**physics please need help **

A parallel RL circuit has a reactance of 250 W and a resistance of 125 W. The phase angle of the circuit impedance is
*Friday, May 31, 2013 by Adam*

**physics please need help **

If the period of an AC sine wave is 180 ms, the frequency is
*Friday, May 31, 2013 by Adam*

**physics**

describe with the aid of a fully labelled diagram the features and their uses of a bicycle pump
*Friday, May 31, 2013 by Tanaka Mufuvi*

**physics**

an electron with velocity v=3x10 to the power 7 m/s describes a circular path in a uniform magnetic field of 0.2T perpendicular to it calculate the radius of the path?
*Friday, May 31, 2013 by Sonal*

**Physics**

when a wire of length 5m & radius 0.5mm is stretched by a load of 49N the elongation produced in the wire is 0.1cm find the energy stored per unit volume of the wire?
*Friday, May 31, 2013 by Sonal*

**Physics**

Which of the following is the correct relationship between the electric field strength and the potential difference?
*Friday, May 31, 2013 by tanya*

**Physics**

Which of the following is correct for a step-down transformer?
*Friday, May 31, 2013 by april*

**Physics**

Which of the following is correct for the two coherent light waves to produce zero light?
*Friday, May 31, 2013 by Janet*

**Physics**

A tunable capacitor (with variable capacitance) is charged by a U0=12 V battery and then is connected in parallel to a R=3 Ω resistor. The capacitance C(t) of the capacitor is controlled so that the current in the circuit remains constant at all times. What is the power (...
*Friday, May 31, 2013 by Mathslover*

**physics**

The Easy Bake Oven is a common toy for young children who want to emulate the process of cooking. Suppose this oven is plugged into a 120 V electrical outlet and "cooks" the food by using a 144 ohm resistor light bulb that converts electrical energy to both light and...
*Thursday, May 30, 2013 by Julia*

**Physics**

the car has wheels of radius 0.3 m and is travelling at a speed of 36 m/s in a straight line and the wheel now describes 40 revolution while the car is brought to rest; calculate the wheels angular acceleration.
*Thursday, May 30, 2013 by Circular motion*

**Physics**Scientist**

Please help me with this!! I really can't find it. 1) This scientist used his device by dropped a spool of wire through a magnetic field. 2)This scientist used a torsional balance to show that the magnetic repulsion between magnetic poles varied by the square of the ...
*Thursday, May 30, 2013 by Isis*

**physics **

if a scientist working with electromagnetic radiation has detected a frequency of 2.8X10^10Hz for one of the waves, what is the wavelength of this radiation wave?
*Thursday, May 30, 2013 by carmen *

**physics **

a concave mirror has a focal length of 20 cm. A person places her face 15 cm away from the mirror. a)how far is the image from the mirror? b)what would have happened to the person's image if she had placed her face 25 cm away from the mirror?
*Thursday, May 30, 2013 by patty *

**physics **

A box is placed 50 cm away from a double convex lens. The image is on the opposite side of the lens, is inverted and 50 cm away from the lens. find: a)the focal length of the lens. b)the height of the image. c) using the focal length that you found, how far from the lens would...
*Thursday, May 30, 2013 by kate *

**Physics **

Determine the gain in dB for a filter that has an output power of 4.9 W and an input power of 3.6 mW.
*Thursday, May 30, 2013 by Adam*

**physics**

A juggler traveling in a train on level track throws a ball straight up, relative to the train, with a speed of 5.75 m/s. The train has a velocity of 19 m/s due east. (a) As observed by the juggler, what is the ball's total time of flight? s What is the displacement of the...
*Thursday, May 30, 2013 by James*

**Physics**

A fuel has heat of combustion equal to 30 kJ / g. How much energy is released when 5 kilograms are oxidized?
*Thursday, May 30, 2013 by Pete*

**Physics**

A compartment measures 3.5 meters by 5.5 meters and is 3 meters high. A fire raises the temperature from 68of to 1500 of. If the starting pressure was 1 atmosphere, what volume is present at the elevated temperature assuming the compartment has openings to reduce pressure?
*Thursday, May 30, 2013 by Pete*

**Physics**

A compartment measures 3 meters by 5 meters and is 2.8 meters high. A fire raises the temperature from 20oC to 1000 oC. If the starting pressure was 1 atmosphere, what pressure is present at the elevated temperature assuming the compartment remains closed?
*Thursday, May 30, 2013 by Pete*

**heeeelp physics**

A tunable capacitor (with variable capacitance) is charged by a U 0=12 V battery and then is connected in parallel to a R=3 Ω resistor. The capacitance C(t) of the capacitor is controlled so that the current in the circuit remains constant at all times. What is the power...
*Thursday, May 30, 2013 by andrew*

**physics**

if the shortest lenggth of the tube for resonance is 0.1m and next resonance length is 0.35m what is the frequency of the vibration
*Thursday, May 30, 2013 by kelvin*

**Physics**

Find the scalar product of the vectors ai+bj and bi-aj . Where a and b are arbitrary constants. What's the angle between the two vectors?
*Thursday, May 30, 2013 by Jacob*

**physics **

An oven is plugged into a 120 V electrical outlet and "cooks" the food by using a 144 ohm resistor light bulb that converts electrical energy to both light and heat energy. If the light bulb converts 75% of the electrical energy to thermal energy, and the oven is ...
*Thursday, May 30, 2013 by maddy*

**physics**

A 5.0 ball is initially sitting at rest on top of a 41 m high hill. The ball is pushed with a force of 25 N for 3.0 s toward the edge of a hill. Upon reaching the edge, the ball is allowed to roll down the hill where it reaches the flat ground. To the nearest mile per hour, ...
*Thursday, May 30, 2013 by maddy*

**physics**

if the shortest lenght of the tube for resonance is 0.1m and next resonanc length is 0.35m what is the frequency of the vibration.
*Thursday, May 30, 2013 by kelvin*

**Physics**

A 55 kg skateboarder comes over the top of a hill at 5.0 m/s and reaches 11 m/s at the bottom. Find the total work done on the skateboarder between the top and bottom of the hill.
*Thursday, May 30, 2013 by Darius*

**Physics**

At what speed must a 950 kg subcompact car be moving to have the same kinetic energy as a 3.2*10^4 kg truck going 20 km/h ?
*Thursday, May 30, 2013 by Jenny*

**Physics**

How much work does it take to stretch the spring from 10 cm to 20 cm from equilibrium?
*Thursday, May 30, 2013 by Jennifer*

**Physics**

How much work does it take to stretch a spring with k= 150N/M 10cm from equilibrium?
*Thursday, May 30, 2013 by James*

**Physics**

If the coefficient of kinetic friction is 0.25, how much work do you do when you slide a 45 kg box at constant speed across a 5.8m -wide room?
*Thursday, May 30, 2013 by James*

**Physics*****

1) Assume that you have two objects one with a mass of 10 kg and the other with a mass of 15 kg each with a charge of +3.0x10^-6 C and separated by a distance of 2 m. What is the electric force that these objects exert on one another? 2) Determine what happens to the electric ...
*Thursday, May 30, 2013 by Isis*

**Physics**

The average index of refraction of water is n=1.336. (a) What is the Brewster angle θBr when light reflects in water off air (i.e. at point B) (give your answer in degrees)? (b) r is the angle of incidence of the light ray at point B in the figure above. What is r−...
*Thursday, May 30, 2013 by Anonymous*

**Physics**

What would be the radius (φmax, in degrees) of a glass bow? The glass beads have an index of refraction n=1.5. We spread them out on the ground and we observe a glass bow as the sun is high in the sky.
*Thursday, May 30, 2013 by Anonymous*

**Physics**

Light of a red laser (wavelength λ=650 nm) goes through a narrow slit which is only a=2 microns wide. After the light emerges from the slit, it is visible on a screen that is L=5 meters away from the slit. What is the approximate width on the screen (in cm) of the bright ...
*Thursday, May 30, 2013 by Anonymous*

**Physics**

A car with its 2 headlights on is approaching you at night. Approximately how close (in meters) does the car have to be to you so that you can distinguish the two headlights? Assume that the diameter of your pupils is 6.5 mm, the distance between the two lights is 1.5 m, and ...
*Thursday, May 30, 2013 by Anonymous*

**physics**

The focal length of objective of a telescope is 0.2 m and the eyepiece has a focal length of 1.6 m. What is the length of this telescope? A) 8.0 m B) 1.4 m C) 1.6 m D) 1.8 m
*Thursday, May 30, 2013 by dianna*

**Physics**

Many of you may have noticed the phenomenon that basketballs get flat if the weather is cold. If a basketball was inflated to a gauge pressure of 60,000 Pa when the temperature outside was 20∘C, what is the gauge pressure inside the basketball in Pa when the temperature ...
*Thursday, May 30, 2013 by Mathslover*

**Physics**

2. How many oxygen atoms are indicated on the right side of this balanced chemical equation? 4 Cr(s) + 3 O2( g)h2 Cr2O3( g)
*Wednesday, May 29, 2013 by jamya*

**Physics**

A 5.0*10^-6C point charge is placed at the 0.00 cm mark of a meter stick and a -4.0 *10^-6C point charge is placed at the 50 cm mark. At what point on a line joining the two charges is the electric field due to these charges equal to zero?
*Wednesday, May 29, 2013 by I need an answer now*

**physics**

why does it take a longer time for a kilogram of water than a kilogram of copper to reach the same temperature?
*Wednesday, May 29, 2013 by david*

**Physics**

Two forces act on a 55-kg object. One force has the magnitude 65 N directed 59 clockwise from the positive x-axis, and the other has a magnitude ofm35 N at 32 clockwise from the positive y axis. What is the magnitude of acceleration?
*Wednesday, May 29, 2013 by David*

**physics**

An eyepiece is made of two positive thin lenses, each of focal length f = 20 mm, separated by a distance of 16 mm. (a) Where must a small object viewed by the eyepiece be placed so that the eye receives parallel light from the eyepiece? (b) Does the eye see an erect image ...
*Wednesday, May 29, 2013 by Ray*

** Physics**

A ball with a mass of 0.25 kilogram is swung on the end of a rope that is 3.0 meters long. The ball travels with a linear velocity of 10.00 meters per second. What centripetal force is acting on the ball?
*Wednesday, May 29, 2013 by Chad*

**physics**

While passing a slower car on the highway, you accelerate uniformly from 18.5 m/s to 29.3 m/s in a time of 12.0 s. How far do you travel during this time?
*Wednesday, May 29, 2013 by A*

**Physics****

1) Assume that you have two objects one with a mass of 10 kg and the other with a mass of 15 kg each with a charge of +3.0x10^-6 C and separated by a distance of 2 m. What is the electric force that these objects exert on one another? 2) Determine what happens to the electric ...
*Wednesday, May 29, 2013 by Isis*

**Physics**

A snowmobile moves according to the velocity-time graph shown in the drawing. What is the snowmobile's average acceleration during each of the segments A, B, and C? The scale for the time axis is 60 s per increment, and the scale for the velocity axis is 270 m/s per ...
*Wednesday, May 29, 2013 by James*

**physics**

A boy throws a ball up into the air with a speed of 12.3 m/s. The ball has a mass of 0.25 kg. How much gravitational potential energy will the ball have at the top of its flight? (Assume there is no air resistance.)
*Wednesday, May 29, 2013 by Anonymous*