Wednesday

November 25, 2015
**Physics**

A constant force of friction of 50 N is acting on a body of mass 200kg moving initially with a speed of 15m/s. How long does the body take to stop? What distance will it cover before coming to rest?
*Thursday, July 30, 2015 by Anna*

**physics**

Thank you Henry for helping me with my physics problem about the angle etc and the golf ball on 7/28.
*Wednesday, July 29, 2015 by Doug*

**physics**

two charges, -16uC and +4uC, are separated by three meters. a) Where along the line through the charges is the electric field zero? b) What is the force on a 14uC charge place there? uC = microCoulombs for a), would it be 16+ -4? Thank you!
*Wednesday, July 29, 2015 by Lola*

**physics**

A meter stick is found to balance at the 47.3cm mark when placed on a fulcrum. When a 45.7g mass is attached at the 10.5cm mark, the fulcrum must be moved to the 38.5cm mark for balance. What is the mass of the meter stick?
*Wednesday, July 29, 2015 by Mishaal*

**physics**

A 100 kg trunk loaded with old books is to be slid across a floor by a young woman who exerts a force 300 N down and forward at 30° with the horizontal. If µs = 0.5 and µk = 0.5, compute the resulting acceleration.
*Wednesday, July 29, 2015 by nwra*

**Physics**

A child pushes tangentially on a small hand driven merry- go- round. She is able to accelerate it from rest to 18 rpm in 10 s. Modeling the merry go round as a uniform disk of radius 2.5 m and mass 780 kg, find the torque required to produce that acceleration. Neglect the ...
*Tuesday, July 28, 2015 by Anonymous*

**Physics**

A potter is shaping a bowl on a a potter’s wheel. The wheel rotaes at a constant angular speed. The frictional force between her hands and the clay is 1.25 N. How large is the torque she produces on the wheel if the diameter of the bowl is 13 cm.
*Tuesday, July 28, 2015 by Anonymous*

**Physics**

Fred Flintstone’s club–ax is made up of two parts: an uniform 3.0 kg stick and a symmetrical 10 kg stone attached to the end of the stick. The dimensions of the club-ax are shown in the figure. How far is the center of mass from the handle end of the club-ax? Express...
*Tuesday, July 28, 2015 by Anonymous*

**Physics**

A system consists of the following masses loacted in the xy- plane: 5.0 kg at the point (0,5), 7.5 kg at the point (3,8) and 6.5 at the point (-3, -6). Find the distance from the origin to the center of mass.
*Tuesday, July 28, 2015 by Anonymous*

**physics**

A particles of mass 10-2kg is fixed at the tip of a fan blade which rotates at an angular velocity of 100rad-1.if the radius of the blade is 0.2m,then what is the centripetal force?
*Tuesday, July 28, 2015 by anthony*

**physics**

a golf ball is observed to hit the ground 800 ft. away after a flight of 5 seconds. Assume that the ground is level and neglect friction of the air. Find the angle of elevation above the ground of the initial motion of the ball, find the initial velocity of the ball, find its ...
*Tuesday, July 28, 2015 by Doug*

**physics**

A stone is thrown horizontally outward from the top of a bridge, the stone is released 19.6meter above the street below.the initial velocity of the stone is 5.0m/s.determine the (a)total time that the stone is in the air (b)magnitude and direction of the velocity"...
*Tuesday, July 28, 2015 by anthony*

**Physics**

A uniform solid sphere rolls along a horizontal frictionless surface at 35 m/s and makes a smooth transition onto a frictionless incline having an angle of 300. How far up the incline does the sphere roll when it comes to a momentary stop? Note for a sphere I= 2/5Mr2, where M ...
*Tuesday, July 28, 2015 by Anonymous*

**Physics**

Three children are trying to balance on a seesaw. The seesaw is 3.9 m long and pivots about a rock at its center. Louie and Laura are already sitting on opposite ends. If Martha weighs 27 kg, where should she sit so as to balance the seesaw? 50kg kid--------------35kg kid...
*Tuesday, July 28, 2015 by Anonymous*

**Physics**

A uniform solid sphere rolls along a horizontal frictionless surface at 35 m/s and makes a smooth transition onto a frictionless incline having an angle of 300. How far up the incline does the sphere roll when it comes to a momentary stop? Note for a sphere I= 2/5Mr2, where M ...
*Tuesday, July 28, 2015 by Anonymous*

**Physics**

A bolt requires tightening to a torque of 98 N-m. If a wrench is 28 cm long, what perpendicular force should be applied at its end?
*Tuesday, July 28, 2015 by Anonymous*

**physics**

our charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 μC and -6 μC respectively. The charges on the lower left and right corners are -2.4 μC and -9 μC respectively. The net electric ...
*Tuesday, July 28, 2015 by Lauren*

**Physics**

A system consists of the following masses loacted in the xy- plane: 5.0 kg at the point (0,5), 7.5 kg at the point (3,8) and 6.5 at the point (-3, -6). Find the distance from the origin to the center of mass.
*Tuesday, July 28, 2015 by Anonymous*

**Physics**

A child pushes tangentially on a small hand driven merry- go- round. She is able to accelerate it from rest to 18 rpm in 10 s. Modeling the merry go round as a uniform disk of radius 2.0 m and mass 800 kg, find the torque required to produce that acceleration. Neglect the ...
*Tuesday, July 28, 2015 by Anonymous*

**physics**

Sam travels east on his kayak for a distance 1.00km.Then,he heads 60 degrees South of East for 0.75km and finally veers at 20 degrees north of east for 0.5km.At the end of his trip,where is Sam reletion to his starting piont?
*Tuesday, July 28, 2015 by daina*

**Physics**

The spin-drier of a washing machine slows down uniformly from 700 rpm (revolutions per minute) to 140 rpm while making 50 revolutions. Find the angular acceleration through these 50 revolutions. Express your answer in rad/s^2.
*Tuesday, July 28, 2015 by Anonymous*

**Physics**

A belt passes over a wheel of radius 25 cm. If a point on the belt has a speed of 26 m/s. How fast is the wheel turning? Express your answer in rad/s.
*Tuesday, July 28, 2015 by Anonymous*

**Physics**

0.4kg bullet is fired from a gun at a speed of 100 m/s . If the bullet rises straight up into the air, what is the maximum height that the bullet can reach?
*Tuesday, July 28, 2015 by JOYE*

**Physics**

Romeo takes a uniform 11 m ladder and leans it against the smooth wall of the Capulet residence. The ladder's mass is 18.0 kg, and the bottom rests on the ground 2.8 m from the wall. When Romeo, whose mass is 79 kg, gets 90% of the way to the top, the ladder begins to slip...
*Tuesday, July 28, 2015 by Anonymous*

**Physics**

A particle is projected from the surface of Earth with a speed equal to 2.4 times the escape speed. When it is very far from Earth, what is its speed? ?km/s
*Monday, July 27, 2015 by Anonymous*

**Physics**

What distance does Anna covered by running on a circular track of length 500m?
*Monday, July 27, 2015 by Edgar*

**Physics**

What is the tension in the string in (Figure 1) ? The volume of plastic ball is 95 cm3 and the density is 840 kg/m3.
*Sunday, July 26, 2015 by Tommy*

**Physics**

a full draw is the maximum distance that an archer can pull an arrow. Using the recurve bow shown below, a particular archer requires an average force of 130N to pull a full draw of 70.0cm. (when the arrow is relaxed in the bow, there is a distance of 30.0cm btween the arrow ...
*Sunday, July 26, 2015 by Brandy*

**Physics**

An officer is investigating an accident. A car has struck a pedestrian at a school crosswalk.There are no witnesses to the accident. The officer measures the coefficient of friction at the accident site to be 0.55, and he measures skid marks that are 52m long. What is the ...
*Sunday, July 26, 2015 by Beth*

**Physics**

A pole-vaulter just clears the bar at 4.42 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3800 J. What is his weight?
*Sunday, July 26, 2015 by zee*

**physics**

8. Two blocks of masses 50 Kg & 30 Kg, lie on two smooth inclined planes of 30° and 60° through a light rope which passes over a smooth pulley at junction of two planes. Calculate common acceleration and tension in rope
*Sunday, July 26, 2015 by srinivasan*

**Physics**

Canadian geese move up and down on the surface of a lake. If one moves up and down 15 times a minute and you estimate the distance between the wave crests to be 1 m, determine the speed of the water F = rpm F = 15/60 F = .25 V = wavelength * Frequency v = 0.25 m/s Thank you
*Sunday, July 26, 2015 by Lucina*

**physics**

the bob of a simple pendulum has a mass of 0.03kg.determine the weight of the bob
*Saturday, July 25, 2015 by jude*

**physics(capacitors)**

A sheet of paper 40mm wide and (1.5 x 10^-2) thick is placed between a metal foil of the same width is used to make a 2.0 UF capacitor. If the dielctric constant(relative permitivity of the paper is 2.5 ,what length of paper is required?
*Saturday, July 25, 2015 by benjamin*

**Physics**

A 6.0mc is placed at the origin and -4.0mc is placed at 2.0m to the right. What is the force on F1,F2? The first charge due to the presence of second charge ? What is the force on the second charge due to the presence of first charge?
*Saturday, July 25, 2015 by Mark adrian*

**Physics**

In the figure, a thin uniform rod of mass m = 3.05 kg and length L = 1.11 m rotates freely about a horizontal axis A that is perpendicular to the rod and passes through a point at a distance d = 0.201 m from the end of the rod. The kinetic energy of the rod as it passes ...
*Saturday, July 25, 2015 by Bruce*

**physics**

mod of a cap - b cap = ¡Ì2 then calculate the value of mod of a cap + ¡Ì3b acp
*Saturday, July 25, 2015 by Vijay*

**physics**

The intensity of a certain sound wave is 6 ì W.cm2. if its intensity is raised by 20 decibels, the new intensity (in ìW/cm2) is : a. 60 b. 6.6 c. 6.06 d. 600 E. 12
*Friday, July 24, 2015 by khaled fayek*

**Physics**

An automobile has four tires, each one inflated to a gauge pressure of 176,357 Pa. Each tire is slightly flattened by its contact witht he ground, so that the area of contact is 21.9 cm by 17.9 cm. What is the weight of the automobile?
*Friday, July 24, 2015 by Kirsten*

**physics**

A man cleaning his apartment pushes a vacuum cleaner with a force of magnitude 55.8 N. The force makes an angle of 15.3 ◦ with the horizontal floor. The vacuum cleaner is pushed 3.55 m to the right along the floor. Calculate the work done by the 55.8 N force. Answer in ...
*Friday, July 24, 2015 by marissa*

**nvas physics**

A body is thrown vertical ly upward with a velocity of the 21m/s find maximum height reached by body
*Thursday, July 23, 2015 by swayam*

**Physics**

Find the gravitational force acting on the Sun by the Earth. Given: Mass of the Sun = 1.99 * 1030 kg Mass of the Earth = 5.98 * 1024 kg Radius of the Sun = 6.96 * 108 m Radius of the Earth = 6.37 * 106 m Distance between the Sun and the Earth = 1.50 * 1011 m G = 6.67 * 10–...
*Thursday, July 23, 2015 by Emily*

**Physics**

The two ropes shown in the bird's-eye view of (Figure 1) are used to drag a crate 3.7 m across the floor. How much work is done by the force fk→? How much work is done by the force T1→? How much work is done by the force T2→?
*Wednesday, July 22, 2015 by Tommy*

**Physics/ Chemistry**

The carbon isotope 14C is used for carbon dating of objects. A 14C nucleus can change into a different kind of element, a neighbor on the periodic table with lower mass, by emitting a beta particle – an electron or positron – plus a neutrino or an anti-neutrino. ...
*Wednesday, July 22, 2015 by Anonymous*

**Physics**

We commonly see Superman being shot and bullets bounce off of him. Suppose Mr. Bad shoots Superman with 4.00 kg bullets at a rate of 100 bullets/min for 9.00 s. If the speed of each bullet is 480.00 m/s and rebounds straight back with no change in speed, calculate the ...
*Wednesday, July 22, 2015 by Anonymous*

**Physics**

An example of an elastic collision is The gravitational slingshot effect . A spacefship of mass 850 kg is moving at 9.5 km/s in the +x direction. It approaches the planet Saturn, mass 5.68 x10 26kg , which is moving in the –x- direction as shown in the figure. The ...
*Wednesday, July 22, 2015 by Anonymous*

**Physics Momentum: Elastic Collision**

The carbon isotope 14C is used for carbon dating of objects. A 14C nucleus can change into a different kind of element, a neighbor on the periodic table with lower mass, by emitting a beta particle – an electron or positron – plus a neutrino or an anti-neutrino. ...
*Wednesday, July 22, 2015 by Anonymous*

**Physics**

A 7900 kg truck traveling east at 5 m/s collides with a 1650 kg car traveling 300 south of west at 20 m/s. After the collision at what angle do the two vehicles move. Express you answer in degrees from the positive x-axis. Use a coordinate where north is the +y axis and east ...
*Wednesday, July 22, 2015 by Anonymous*

**physics**

When a car screeches to a sudden stop to avoid hitting a dog, it slows down from 9.00 m/s to 0.00 m/s in 1.50 s. Find the average acceleration of the car?
*Wednesday, July 22, 2015 by ARI*

**Physics**

A 2.1-kg 15-cm-radius cylinder, initially at rest, is free to rotate about the axis of the cylinder. A rope of negligible mass is wrapped around it and pulled with a force of 14 N. (a) Find the magnitude of the torque exerted by the rope. ?N · m (b) Find the angular ...
*Tuesday, July 21, 2015 by Anonymous*

**Physics**

A steel ball of mass m1 = 1.1 kg and a cord of length of L = 2.3 m of negligible mass make up a simple pendulum that can pivot without friction about the point O, as in the figure below. This pendulum is released from rest in a horizontal position, and when the ball is at its ...
*Tuesday, July 21, 2015 by Anonymous*

**Physics**

A 14 g bullet is fired into the bob of a ballistic pendulum of mass 1.6 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet. ?m/s Any help is greatly appreciated. ...
*Tuesday, July 21, 2015 by Raj*

**Physics**

A 10.0-m long wire whose total mass is 39.5 grams is under a tension of 577 N. A pulse is sent down the left end of the wire and 29 ms later a second pulse is sent down the right end of the wire. Where do the pulses first meet?
*Tuesday, July 21, 2015 by Ken*

**Physics**

A solid cylinder rolls down an incline plane without slipping. If the center of mass of the cylinder has a linear acceleration of 2.67 m/s2, what is the angle of the incline to the horizontal?
*Tuesday, July 21, 2015 by Mary*

**physics**

A ball is projected horizontally from the top of a building 19.6m high.if the line joining the point of projection to the point where it hits the ground makes an angle of 45° to the horizontal what is the initial velocity of the ball
*Monday, July 20, 2015 by abc*

**Physics**

A 14 g bullet is fired into the bob of a ballistic pendulum of mass 1.6 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet. ?m/s
*Monday, July 20, 2015 by Anonymous*

**physics**

the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0¡ãc. at what temperature will the length of the rules become equal
*Monday, July 20, 2015 by joseph*

**uniben/physics**

the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0¡ãc. at what temperature will the length of the rules become equal
*Monday, July 20, 2015 by joseph*

**physics**

A golf cart has an acceleration of 0.4 m/s². What is its velocity after it has covered 10 m starting from the rest?
*Monday, July 20, 2015 by Anonymous*

**physics**

The driver of a train traveling at 30 m/s applies the brakes when he passes an amber signal. The next signal is 1.5 km/h down the track and it reaches 75 seconds later. Assuming uniform acceleration, find the velocity of the train at the second signal.
*Monday, July 20, 2015 by Anonymous*

**Physics**

A 500 g block slides down a frictionless inclined plane. At the bottom, a vertical circular loop with radius 67 cm is in the block’s path. From what height would the block need to be released to successfully complete the loop without losing contact with the surface of the...
*Monday, July 20, 2015 by wiyad*

**physics **

a gas is filled in a vessel at 27 degree Celsius. to what temp should it be heated so that it 1/3rd of of the gas escapes out of the vessel? my attempt to solve; i tried applying charles law. so, V1/V2= T1/T2. V2= V1+V1/3= 4V1/3 hence, applying charles law V1/V2= 3/4 T1/T2= ...
*Sunday, July 19, 2015 by saumya *

**physics(kinematics)**

The acceleration of a particle is defined by the relation a=-8m/s2. Knowing that x=20m when t=4 and that x=4m when v=16m/s. Determine. A)the time when the velocity is zero. B)the velocity and total distance traveled when t=11s.
*Sunday, July 19, 2015 by ben*

**blue bells model school **

Science physics A ball A moving with kinetic energy E makes a head on elastic collision with a stationary ball with mass n times that as A . What is the potential enery stored during collision ?
*Sunday, July 19, 2015 by kanika*

**physics**

doing webwork when i came across this question. sure i had it right but apparently im not. The weightless horizontal bar in the figure below is in equilibrium. Scale B reads 4.20 kg (N.B. as you know, the scale should read N, but no one told the manufacturer). The distances in...
*Sunday, July 19, 2015 by sam*

**Physics **

A bridge is 200 m long. A car weighing 2.5 metric tons is 50 m from one end of the bridge and a trucj weighing 6 metric tons is 80 m from the other end. The bridge is uniformly paved and weighs 20 metric tons. How much force does the vertical support at each end exert?
*Sunday, July 19, 2015 by Julie*

**Physics **

A 30-N non-uniform pole, 5m long, was used to carry a load of 400 N by two men. The load was hung at the middle of the pole. Find the center of gravity of the pole if the force exerted by each man on each end were 220 N and 210 N respectively.
*Sunday, July 19, 2015 by Julie*

**Physics **

The ends of a rope are tied to two hooks on a ceiling. A set of books weighing 36.0 N is tied and hung on the rope so that the segments of the rope make angles of 35 degrees and 50 degrees respectively with the horizontal. Compute for the tension on each segment of the rope.
*Sunday, July 19, 2015 by Julie*

**Physics **

A borad, 3m long, is hinged at point a and is supported by a vertical rope at point b, 2m from a. A boy weighing 200 N stands at the end of the board at point c. Neglecting the weight of the board, calculate the force on the rope.
*Sunday, July 19, 2015 by Julie*

**Physics **

A uniform rod 1.2 m long has weight of 1000 dynes and 2000 dynes at its ends. At what point on the rod can it be balanced horizontally if the rod weighs 2500 dynes?
*Sunday, July 19, 2015 by Julie*

**Physics **

A weight of 340 N is suspended from a pole by means of a rod 4m long and a rope tied to one end 3m above. Find the tension on the rope the force of the rod.
*Sunday, July 19, 2015 by Julie*

**Physics **

A girl weighing 310 N sits on a hammock supprted by two ropes. Each tied 60 degree from vertical posts. What is the tension on each rope?
*Saturday, July 18, 2015 by julie*

**Physics**

A particle with a mass of 3.65×10−24 kg and a charge of 6.40×10−19 C starts at rest and is accelerated for a distance of 0.102 m through a uniform electric field having strength E = 7.25×104 N/C. What is the resulting speed of the particle?
*Saturday, July 18, 2015 by Skippy*

**Physics 2**

Three point charges are fixed on the x-axis: 2.9×10−6 C at x = −0.45 m, −9.3×10−6 C at the origin, and 9.1×10−6 C at x = 0.32 m. Find the electrostatic force acting on the charge at the origin due to the other two charges. Let a ...
*Saturday, July 18, 2015 by Skippy*

**Physics 2**

A particle with a mass of 3.65×10^−24 kg and a charge of 6.40×10^−19 C starts at rest and is accelerated for a distance of 0.102 m through a uniform electric field having strength E = 7.25×10^4 N/C. What is the resulting speed of the particle(m/s)?
*Saturday, July 18, 2015 by Skippy*

**physics**

A stone is dropped from a height of 4.5m.What will be the distance travelled by it during the last second of its fall?
*Friday, July 17, 2015 by dona*

**physics**

Calculate the work done if a force of 300N Is applied at 30° to the horinzontal and body moves 20m
*Wednesday, July 15, 2015 by tina loko*

**physics**

What is the variable and unit for centripetal force and centripetal acceleration?
*Wednesday, July 15, 2015 by M*

**Rabindra sahu**

What is physics?
*Wednesday, July 15, 2015 by Rabindra sahu*

**Stanger Secondary ex-school**

What subjects do u really need to do for art such as Drawing and Poetry...#"compulsory subjects" for these arts. Is it: Physics,pure math,geog,life sciences,mech tech,EGD,mah.lit,BS,history,economics,...which ones are needed??? Ain't u shuld be smart in ...
*Wednesday, July 15, 2015 by Philile Teddy Nhleko*

**Physics**

The force F sub x acting on a particle is shown as a function of X. If an object starts at the origin (of a graph) moving to the right with a kinetic energy of 45.5 J, how much kinetic energy does it have at x = 3.0 m ? I have no clue how to do about solving this. Any help ...
*Wednesday, July 15, 2015 by Anonymous*

**Physics**

What is the angle between the vectors A and B if vector A multiplied by vector B = 0.5 AB
*Wednesday, July 15, 2015 by Sarah*

**physics**

a stone is dropped from a cliff 100 ft high .disregarding friction; a.how long does it take the stone to hit the ground b.With what speed and direction does it strike the ground?
*Wednesday, July 15, 2015 by happy *

**physics**

A marble is thrown vertically downward at an initial velocity 200cm/s hits the floor in 2.5 seconds ,At what height is the marble thrown?
*Wednesday, July 15, 2015 by happy*

**physics**

A stone is dropped from a cliff 100 ft. high. Disregarding friction; a. how long does it take the stone to hit the ground? b. With what speed and direction does it strike the ground?
*Wednesday, July 15, 2015 by happy*

**Physics**

A mineshaft has an elevator hung from a single steel-wire cable of diameter 2.5 cm. Young's modulus of the cable is 10×1010N/m2. When the cable is fully extended, the end of the cable is 500 m below the support. How much does the fully extended cable stretch when ...
*Wednesday, July 15, 2015 by Tommy*

**physics**

What force provides the centripetal force when you swing a stopper with a string above your head horizontally? If the string breaks suddenly, in what direction will the stopper fly to?
*Tuesday, July 14, 2015 by Tobias*

**physics**

A force of 1.3N results in the movement of an object 3.1m northeast.How much work is done
*Tuesday, July 14, 2015 by tina loko*

**Physics**

If an object starts at the origin (of a graph) moving to the right with a kinetic energy of 45.5 J, how much kinetic energy does it have at x = 3.0 m?
*Tuesday, July 14, 2015 by Anonymous*

**physics**

dipole consisting of charges 250nm apart, is placed between two very large (essentially infinite) sheets carrying equal but opposite charge densities of 105. what is the maximum potential energy the dipole can have
*Tuesday, July 14, 2015 by m3*

**PHYSICS**

Two equal forces applied to a rotating rod, one very close to the axis and one far from the axis. Which force produces the largest torque? a. the one closest to the axis b. the one furthest from the axis How would you kick a football so that id did not spin end over end? a. at...
*Tuesday, July 14, 2015 by anonymous*

**PHYSICS**

) An electron of mass m and charge q = -e is released with an initial speed v ; from the center of the hole (at the origin) in the upward direction (along the perpendicular axis [0 the washer) experiencing no forces except repulsion by the charges on the washer. What speed ...
*Tuesday, July 14, 2015 by Anonymous*

**PHYSICS**

Imagine a soap film (air-soapy water-air) of 1 l,m thickness, and refractive index of 1.5 with white light normal to the film. Which wavelengths in the optical range (400 nm to 700 nm) will appear brightest?
*Tuesday, July 14, 2015 by Anonymous*

**Physics**

In a Young's double-slit experiment, the slits are 1mm apart and are illuminated by laser light of wavelength 681.8nm. The screen is 3.9m away. What is the number of dark fringes per centimetre?
*Tuesday, July 14, 2015 by Amber*

**physics**

A student is thrown in a lake by his teacher, the student has a mass of 70 kg and a volume of 80,000 cm^3. Would the student sink or float? What is the net force on the student? What is the density of an object that has a mass of 2000 kg and a volume of 1.5 m^3? Would it sink ...
*Tuesday, July 14, 2015 by John*

**physics**

a stone is thrown horizontally with an initial velocity of 15m/s from a tower 20 meters high. How long does the stone take to reach the ground?
*Tuesday, July 14, 2015 by wilson*

**Physics**

A 2 kg block of cheddar cheese hangs from an ideal spring of negligible mass. When displaced from equilibrium and released, the cheese oscillates with a period of 0.4 secs. How much the spring stretched when the cheese hangs in equilibrium?
*Tuesday, July 14, 2015 by Kristina*

**Physics, Eectric flux**

A cubical Gaussian surface surrounds three positive charges, each has a charge q1 = +4.00 × 10-12 C, and two negative charges, each has a charge q2 = −2.30 × 10-12 C as the drawing shows. What is the electric flux passing through the surface?(The permittivity...
*Monday, July 13, 2015 by Dave*

**Physics**

An airplane pulls into a vertical loop, and has horizontal and vertical velocities Vx=90m/s and Vy=120m/s. If the radius of curvature of the flight path is R=900m, and the airplane has a vertical acceleration Ay=11m/s^2, determine its tangential and horizontal accelerations at...
*Monday, July 13, 2015 by J.T.*

**Chemistry/Physics**

How much heat is required to raise the temperature of 100 g of lead 20 degrees C? The specific heat of lead is 0.0305 cal/g K. A) 51 cal B) 61 cal C) 71 cal D) 81 cal
*Monday, July 13, 2015 by Domino*