Sunday

February 7, 2016
**Physics**

Light of wavelength 550 nm strikes a single slit of width 1.00 x 10-5 m that is 100.0 cm away from a screen. The screen is 36 cm wide, with the central maximum falling exactly at its centre. How many dark fringes in total will be seen on the screen ? Count dark fringes both ...
*Sunday, December 13, 2015 by Anonymous*

**Physics**

A 0.01 kg Styrofoam ball is released from rest 2m above the floor. It reaches a speed of 3m/s the moment before it hits the floor. How much heat due to air resistance is generated during this process?
*Sunday, December 13, 2015 by John*

**physics**

A 2,200-kg car moving east at 10.0 m/s collides with a 3,000-kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 35.0° north of east and at a speed of 5.16 m/s. Find the speed of the 3,000-kg car before the collision.
*Sunday, December 13, 2015 by king*

**Physics**

If a spring gains 0.400 joules of potential energy as it is stretched 0.0375 meters from its equilibrium, what is the spring's force constant?
*Sunday, December 13, 2015 by Harris *

**Physics (angle Vector)**

You have a boat that is capable of moving at 11.8 m/s through still water. You wish to cross a river that flows due south at 5.4 m/s. At what numerical compass heading must you pilot your boat so that you will reach a destination that is due east of your current position?
*Sunday, December 13, 2015 by Aubin*

**Physics**

Starting from rest, a 10.0 Kg suitcase slides down a 3.00m long ramp inclined at 30.0 degrees from the floor. The coefficient of friction between the suitcase and ramp is .35. A: what net force is applied to suitcase while it is on the ramp? B: what is the change in the ...
*Sunday, December 13, 2015 by Harris *

**Physics **

4) if the speed limit on highways changed from 100 km/hr to 110 km /hr,how much more distance would a car need to speed: A) on dry roads*0.06 B) on wet roads *0.10 C) on icy roads *0.15 *Note convert from km/hr to m/s ,multiply by 0.278 Or m/s to km/hr ,divide by 0.278
*Sunday, December 13, 2015 by LIily*

**Physics**

Bill is moving a crate of mass 35 kg up a ramp that forms a 25 degree angle with the horizontal to a height of 5 m. A) If the ramp is frictionless, how much work must Bill do in pushing the crate to the top? B) How much work does gravity do as Bill pushes the crate up the ramp?
*Sunday, December 13, 2015 by Joseph*

**physics**

the height of the mercury in the glass tube thermometer when in melting ice and then steam are 3 cm and 18 cm respectively
*Sunday, December 13, 2015 by mercy*

**physics**

A golf ball of mass m = 0.12 kg is dropped from a height h. It interacts with the floor for t = 0.14 s, and applies a force of F = 10.5 N to the floor when it elastically collides with it.
*Sunday, December 13, 2015 by susie*

**physics **

Jake needs to catch 1 10 pound fish to last 5 days. He catches 2 3.33 pound fish, 1 2.11 pound, and 1 1 pound fish. How long will he survive with that amount of food?
*Sunday, December 13, 2015 by Joe*

**physics**

A heavy box is pulled across a wooden floor with a rope. The rope forms an angle of 60.0o with the floor. A tension of 80.0N is maintained on the rope. What are the horizontal and vertical components of the force?
*Sunday, December 13, 2015 by km*

**Physics**

A 22kg child on a 1.75m long swing is released from rest when the swing supports make an angle of 35 degrees with the vertical. 1.What is the child's maximum potential energy? 2.Disregarding friction, find the child's theoretical speed at the lowest point. 3.If the ...
*Sunday, December 13, 2015 by Carter*

**physics **

Starting from rest, a 10kg suitcase slides down a 3.00m long ramp inclined at 30 degrees from the floor. The coefficient of friction between the suitcase and the ramp is 0.35. 1) what net force is applied to the suitcase while it is on the ramp? 2)what is the change in the ...
*Sunday, December 13, 2015 by jared*

**Physics **

A baseball catcher moves his glove away from a 40.5 m/s fastball as he catches it. If the average force he exerts on the ball is 1.01 103 N, how far does the glove move? Assume constant deceleration of the ball, which has a mass of 0.144 kg. I dont know where to start can ...
*Sunday, December 13, 2015 by Mohammad*

**Physics**

A projectile with a mass of 2.50 kg is shot horizontally from a height of 15.0 m above a flat surface. The projectile's initial speed is 22 m/s. 1.How much mechanical energy does the projectile have initially ? 2.How much work is done on the projectile by gravity as it ...
*Sunday, December 13, 2015 by Marcus*

**Physics**

Calculate the momentum of a bullet moving with a velocity of 1000m/s ,if it has a mass of 0.01kg
*Sunday, December 13, 2015 by Alexandra *

**PHYSICS( FRICTION)**

A block of 1kg is kept on another block of 2kg in a horizontal surface. Coefficient of friction between two blocks is 0.4. The blocks are given velocities of 2m/s and 8m/s in same direction.The time when relative motion between them will stop =..???
*Sunday, December 13, 2015 by Anonymous*

**physics**

a dockworker applies a constant horizontal force of 80 N to a block of ice on a smooth horizontal floor. The friction force is negligible the block start from rest and move 11m in 5 sec what is it mass & if worker stop pushing at 5sec .How for does the block move in 5 ec
*Sunday, December 13, 2015 by muqadir*

**Physics**

A 600 N skydiver in free fall is accelerating at -7.6 m/s^2 rather than -9.8 m/s^2 because of the force of air resistance. How much drag force is acting on the skydiver? a)58.2 b)65.3 c)61.4 d)40.2 I use the equation Σ(F)vertical-ma=0 To find m I did: 600/9.8 = 61.2 I end...
*Sunday, December 13, 2015 by I attempted-HELP*

**physics **

2.) A sports car is advertised to be able to stop in a distance of 50m from a speed of 90 km/h. What is its acceleration in m/s^2? How many g's is this (g=9.80 m/s^2)
*Saturday, December 12, 2015 by Emma*

**physics**

A clown is rocking on a rocking chair in the dark. His glowing red nose moves back and forth a distance of 0.42m exactly 30 times a minute in a simple harmonic motion. (a) what is the amplitude of this motion? (b) what is the period of this motion? (c) what is the frequency of...
*Saturday, December 12, 2015 by Peter *

**physics**

How much would the time keeping of a pendulum clock be affected by taking it to the moon? Gravity is 1.6m/s ^2, compared with 10m/s ^2 on the earth.
*Saturday, December 12, 2015 by Peter *

**Physics**

An automobile weighing 15,000 N crashes into a wall with a velocity of 5.00 m/s. If the car moves 0.150 m before coming to a stop, what average force does the wall exert on the car?
*Saturday, December 12, 2015 by Aidan*

**Physics**

Using proper formulas, how do you go about with this question... really confused 1.) A sprinter accelerates from rest to 10.0m/s in 1.35s. What is her acceleration (a) in m/s^2 and (b) in km/h^2? 2.) A sports car is advertised to be able to stop in a distance of 50m from a ...
*Saturday, December 12, 2015 by Emma*

**Physics -- URGENTTT**

Calculate the change in potential energy of a 78.9 kg man when he takes an elevator from the first floor to 43th floor, if the distance between floors is 4.59 m. (in J)
*Saturday, December 12, 2015 by Shaxx*

**delta prep (physics)**

A 0.27 kf bullet is fired from a 4.1kg gun the bullet leaves the gun at a speed of 200m/s what os the recoil speed of the gun
*Saturday, December 12, 2015 by karmel*

**Physics**

In a perfectly insulating container, what is the equilibrium state (temperature and phases) if one mixes 475 g of water vapor at 140 degrees Celsius with 25 g of ice at 0 degrees Celsius?
*Saturday, December 12, 2015 by Zach*

**Physics**

A 2.00 kg box slides down a rough incline plane from a height h of 1.15 m. The box had a speed of 2.77 m/s at the top and a speed of 2.34 m/s at the bottom. Calculate the mechanical energy lost due to friction (as heat, etc.). (in J)
*Saturday, December 12, 2015 by Shaxx*

**physics please urgently**

A body whose weight is W1=75N is tied to another body whose weight is W2=45N .If the coefficient of kinetic friction between W1 and the inclined plane (25°)AB is 0.15,calculate the coefficient of kinetic between W2 and the inclined plane(15°) BC when the two masses ...
*Saturday, December 12, 2015 by jay*

**Physics**

A bullet leaves a rifle with a muzzle velocity of 521 m/s. While accelerating through the barrel of the rifle, the bullet moves a distance of 0.840 m in 0.003 seconds. Determine the acceleration of the bullet. So I basically used the formula: Change in position= (Initial ...
*Saturday, December 12, 2015 by John*

**physics**

A body whose weight is W1=75N is tied to another body whose weight is W2=45N .If the coefficient of kinetic friction between W1 and the inclined plane (25°)AB is 0.15,calculate the coefficient of kinetic between W2 and the inclined plane(15°) BC when the two masses ...
*Saturday, December 12, 2015 by jay*

**physics **

A Student jumps off a diving board that is 6.7 meters above the ground. As a student falls down what happens to the Potential energy, Kinetic energy, and the Total Mechanical energy.
*Friday, December 11, 2015 by ayleen *

**Physics**

mass of 4.00 kg rests on a rough horizontal table. The coefficient of static friction between the block and the table is 0.54. The block is attached to a hanging mass by a string that goes over a smooth pulley, as shown in the diagram. Determine the largest mass that can hang ...
*Friday, December 11, 2015 by Anonymous*

**Physics **

You have a boat that is capable of moving at 10.4 m/s through still water. You wish to cross a river that flows due west at 2.8 m/s. At what numerical compass heading must you pilot your boat so that you will reach a destination that is due south of your current position?
*Friday, December 11, 2015 by Cynthia*

**PHYSICS**

A marble with a mass of 0.5 kg is moving to the right at 1.25 m/s and a second marble with a mass of 0.35 kg is moving to the left at 2.15 m/s. If they collide head on and the collision is elastic find the final velocities of the two marbles
*Friday, December 11, 2015 by DAVID*

**physics**

A runner of mass m = 58 kg and running at 2 m/s runs as shown and jumps on the rim of a playground merry-go-round which has a moment of inertia of 408 kg·m2 and a radius of 2 meters. Assuming the merry-go-round is initially at rest, what is its final angular velocity to...
*Friday, December 11, 2015 by Anonymous*

**Ap physics 1**

The mass of a star in a galaxy far, far away, is 3.12 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 2.46 × 108 km. Treating this planet and star as particles,with each mass ...
*Friday, December 11, 2015 by Jonathan*

**Physics grade 11-**

A car traveling at 72 km/hr hits a tree. the driver, who has a mass of 55.0 kg comes to a rest 0.10s after the impact. What is the force that acts on the driver?
*Friday, December 11, 2015 by Maddie *

**Physics **

A woman holds a 1.90-m-long uniform 5.0-kg pole as shown in (Figure 1) ( its horizontal). A. Determine the force she must exert on the pole at A. Express your answer to two significant figures and include the appropriate units. Enter positive value if the force is upward and ...
*Friday, December 11, 2015 by Natalie*

**Physics**

An aeroplane is heading north at a speed of 300km/h . If wind begins blowing at a speed of 50km/h from the west , calculate the magnitude of the velocity of the aeroplane relative to ground?
*Friday, December 11, 2015 by Ranya*

**Physics**

If I use 1.013x10^5 instead of given 101kpa....is it wrong?
*Friday, December 11, 2015 by Shah talal*

**Physics**

A uniform rod is 4m long and weighs 10 kg.if it is supported on a knife edge at one metre from the end what weight placed at that end keeps the rod horizontal?
*Friday, December 11, 2015 by priya*

**Physics **

Salt water is poured into a U tube until it stands 0.250 m high in each arm. Oil is then added slowly to one arm until the salt water in the other arm stands 0.300 m high. The free surface of the oil then stands at 0.321 m high. (the weight density of the salt water is 10,100N...
*Friday, December 11, 2015 by Jon*

**Physics **

The average speed of an orbiting space shuttle is 19700 mi/h. The shuttle is orbiting about 125 mi above the Earth’s surface. Assume the Earth’s radius is 3963 mi. How long does it take to circle the earth? Answer in units of h.
*Thursday, December 10, 2015 by Lily *

**Physics **

A jogger runs in a straight line with an average velocity of 5.4 m/s for 2.3 min, and then with an average velocity of 5.7 m/s for 1.2 min. What is her total displacement? Answer in units of m.
*Thursday, December 10, 2015 by Lily *

**Physics **

Two lifeguards pull on ropes attached to a raft. If they pull in the same direction, the raft experiences a net external force of 363 N to the right. If they pull in opposite directions, the raft experiences a net external force of 147 N to the left. Draw a free body diagram ...
*Thursday, December 10, 2015 by Lily *

**Physics**

What is the "Percent Difference Formula for Momentum"?
*Thursday, December 10, 2015 by Derrick*

**Physics / Astronomy**

If there is no dark matter, in order to explain our observations, our concepts of an important building block of the universe have to be incorrect. What is that building block and why do Astronomers overwhelmingly favor dark matter, which they cannot see, to explain our ...
*Thursday, December 10, 2015 by AJ*

**physics**

Water is leaking out of an inverted conical tank at a rate of 10700.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 7.0 meters and the diameter at the top is 4.0 meters. If the water level is rising ...
*Thursday, December 10, 2015 by emily*

**Physics **

A light ray in water is directed at the water surface at an angle of incidence at 40 degrees. Calculate the angle of refraction of the light ray at this surface.
*Thursday, December 10, 2015 by Bobby*

**Physics **

Suzie (of mass 84 kg) is roller-blading down the sidewalk going 34 miles per hour. She notices a group of workers down the walkway who have unexpectedly blocked her path, and she makes a quick stop in 1.1 seconds. What is Suzie’s average acceleration? Answer in units of m...
*Thursday, December 10, 2015 by Lily *

**physics**

A thermos contains 147 cm3 of coffee at 95.0 °C. To cool the coffee, you drop two 12.4-g ice cubes into the thermos. The ice cubes are initially at 0 °C and melt completely. What is the final temperature of the coffee in degrees Celsius? Treat the coffee as if it were ...
*Thursday, December 10, 2015 by Anonymous*

**Physics **

A force is applied to a 1.4 kg mass and pro- duces 2.5 m/s2 acceleration. What acceleration would be produced by the same force applied to a 12.2 kg mass? Answer in units of m/s2.
*Thursday, December 10, 2015 by Lily *

**physics**

A piece of glass has a temperature of 76.0 °C. Liquid that has a temperature of 40.0 °C is poured over the glass, completely covering it, and the temperature at equilibrium is 54.0 °C. The mass of the glass and the liquid is the same. Ignoring the container that ...
*Thursday, December 10, 2015 by Anonymous*

**Physics**

A projectile is fired from a height of h meters at a speed of 55m/s and at an angle of 10 degrees above the horizontal. The projectile hits a target at a horizontal distance of 80m from where it was fired and at a vertical height of 1.2m. Find the time for which the projectile...
*Thursday, December 10, 2015 by James*

**Physics 3**

A golf ball is hit at 42.0 m/s at an angle of 20° with the ground. How far away does it land?
*Thursday, December 10, 2015 by Shylea*

**physics**

A girl sits on a tire that is attached to an overhanging tree limb by a rope 2.13 m in length. The girl’s father pushes her with a tangential speed of 2.92 m/s. Besides the force opposing the girl’s weight, the magnitude of the force that maintains her circular ...
*Thursday, December 10, 2015 by hunter*

**Physics**

An arrow is fired horizontally at a speed of 50m/s from the top of a vertical cliff overlooking the sea. The height of the cliff is 12m. Determine The speed and angle to the horizontal of the arrow when it enters the sea?
*Thursday, December 10, 2015 by John*

**physics**

A particle of mass m = 0.3 kg is acted upon by a force so that its position vector, r(t)=2.0t^2(i)- 5.0t^2 (j) +t^2 (k) where t is in s. What is the (instantaneous) power delivered by this force to the particle at time t = 2.0s?
*Thursday, December 10, 2015 by K*

**Physics help!!!!!!!!!!!**

What are some good websites/youtube videos for learning grade 12 Physics - Dynamics strand: Kinematics (1D & 2D motion), Vectors, Relative Motion, Projectile motion, Frames of reference, Forces, Free Body Diagrams, Problem solving - Force of Friction, Normal Force, Pulleys, ...
*Thursday, December 10, 2015 by Physics*

**Physics**

1. A science teacher wanting to demonstrate centripetal acceleration holds a bucketful of water by its handle and spins it in a vertical circle. If the teacher’s arm is 1.15m long, at what speed must the bucket be rotated so that at the top of its path there is no tension...
*Thursday, December 10, 2015 by Anonymous*

**physics**

the amount of heat energy required to convert 5g of ice at 0 degree centigrade into water at 40 degree centigrade is
*Thursday, December 10, 2015 by ddf*

**Physics**

2. Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth. Show your work. Answer: g= GM/r² G= 6.67 * 10^-11 Nm²/kg² ME= 5.98 * 10^24 kg RE=...
*Thursday, December 10, 2015 by Danielle*

**Physics**

Fred and George who are identical twins, same body mass, are competing in aerial skiing. Fred hits the take off with a speed of 15.8, whereas George has a speed of 8.3. How much higher will Fred go?
*Wednesday, December 9, 2015 by Sam*

**Physics**

A girl is floating in a freshwater lake with her head just above the water. If she weighs 395 N, what is the volume of the submerged part of her body?
*Wednesday, December 9, 2015 by Jarrell*

**Physics**

What is the size of the buoyant force on a 31.0 N ball that is floating in fresh water?
*Wednesday, December 9, 2015 by Jarrell*

**Physics**

A storm approaches and the air pressure outside your apartment suddenly drops to 0.960 ✕ 105Pa from 1.013 ✕ 105Pa. Before the pressure inside your apartment has had time to change, what is the magnitude of the net force exerted on a window that measures 2.0 m x 2...
*Wednesday, December 9, 2015 by Jarrell*

**physics**

Two blocks are arranged at the ends of a massless string as shown in the figure. The system starts from rest. When the 4.01 kg mass has fallen through 0.412 m, its downward speed is 1.3 m/s. The acceleration of gravity is 9.8 m/s 2 .
*Wednesday, December 9, 2015 by zach*

**physics**

What is the frictional force between the 5.66 kg mass and the table? Answer in units of N.
*Wednesday, December 9, 2015 by zach*

**physics**

What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s 2 and the surface is frictionless. Answer in units of N.
*Wednesday, December 9, 2015 by zach*

**physics**

A load of 66 N attached to a spring hanging vertically stretches the spring 8.3 cm. The spring is now placed horizontally on a table and stretched 11 cm. What force is required to stretch it by this amount? Answer in units of N.
*Wednesday, December 9, 2015 by zach*

**physics**

A skier (m=55.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 4.90 m and D = 10.6 m, find H.
*Wednesday, December 9, 2015 by sara*

**Physics**

At the top of a hill, a sled is moving at 5 m/s. Later, it is moving at 20 m/s. How far did the sled descend. I have no idea how to do this without another variable like acceleration or time.
*Wednesday, December 9, 2015 by Rayna*

**Physics**

A natural gas power plant burns natural gas to produce electricity. In one second it produces 500 MJ of electrical potential energy. The power plant consumes chemical energy in order to produce electrical potential energy. --In one second does it consume 500 MJ of chemical ...
*Wednesday, December 9, 2015 by Daniel*

**Physics**

A person slides down a slope. At the end of their slide they are brought gently to rest by a large spring. Friction on the slope cannot be ignored. Draw an energy bar chart for this situation. Define your system any way you want, but clearly state how you have defined your ...
*Wednesday, December 9, 2015 by Daniel*

**Science- Physics **

an 80 kg skater and a 60 kg skater stand in the middle of an ice rink and push each other away. the 60 kg skater moves away at 2 m/s calculate her momentum and the velocity of the other skater
*Wednesday, December 9, 2015 by Kerry*

**physics**

A team of dogs drags a 81.2 kg sled 3.12 km over a horizontal surface at a constant speed.The coefficient of friction between the sled and the snow is 0.172. The acceleration of gravity is 9.8 m/s^2 Find the work done by the dogs. Answer in units of kJ.
*Wednesday, December 9, 2015 by Maria *

**Physics**

A storage tank of negligible mass and 30m high is filled with gasoline. Please calculate the following. Use density values found in the book. a) The gauge pressure and absolute pressure at the bottom of the tank. b) The force that acts on a square access hatch at the bottom of...
*Wednesday, December 9, 2015 by Kati*

**physics**

A uniform meter stick of mass 40 g is used to suspend three objects: 15 g at 0.02 m, 40 g at 0.36 m and 35 g at 0.6 m. Where could you place your finger to balance the stick in the horizontal position?
*Wednesday, December 9, 2015 by dany*

**physics**

What are the speed and acceleration (increase/decrease or remain constant) of a ball rolling down a a) straight hill, b) concave hill c) convex hill Can someone explain why they are, not just the answers?
*Wednesday, December 9, 2015 by Christine*

**Physics**

A 2-kg brick is moving at a speed of 6 m/s. how large a force F is needed to stop the brick in a time of 7x10^-4 s?
*Wednesday, December 9, 2015 by Christian*

**physics**

16-g mass is moving in the +x direction at 30 cm/s while a 4-g mass is moving in the -x direction at 50 cm/s. they collide head on and stick together. find their velocity after the collision.
*Wednesday, December 9, 2015 by Christian*

**Physics**

16-g mass is moving in the +x direction at 30 cm/s while a 4-g mass is moving in the -x direction at 50 cm/s. they collide head on and stick together. find their velocity after the collision.
*Wednesday, December 9, 2015 by Christian*

**physics**

A spring scale hung from the ceiling stretches by 6.1 cm when a 2.0 kg mass is hung from it. The 2.0 kg mass is removed and replaced with a 2.5 kg mass. Part A What is the stretch of the spring?
*Wednesday, December 9, 2015 by anon*

**Physics **

A zebra sees a lion 300 m to his right. The zebra starts running at 25 KpH straight ahead to get away. At this point the lion launches himself on an intercept course at the zebra at a speed of 31 KpH. a. At what angle does the lion launch himself? b. If both animals continue ...
*Tuesday, December 8, 2015 by Nicole *

**Physics**

The mass of the heavier block is 22 kg and the mass of the lighter blocks is 11 kg and the magnitude of the force of the connecting string on the smaller block is 13 N. Assume: g = 9.8 m/s 2 and the horizontal surface on which the objects slide is frictionless. Determine the ...
*Tuesday, December 8, 2015 by Blake *

**Physics Energy**

A baseball player puts a baseball on a batting tee. The baseball bat is able to deliver 4.0x10^5 W of power and is in contact with the ball for 0.70 ms and a distance of 1.4 cm. The mass of the ball is 145 g. What is the next force applied to the ball, and what is its average ...
*Tuesday, December 8, 2015 by R*

**Physics**

A zebra sees a lion 300 m to his right. The zebra starts running at 25 KpH straight ahead to get away. At this point the lion launches himself on an intercept course at the zebra at a speed of 31 KpH. a. At what angle does the lion launch himself? b. If both animals continue ...
*Tuesday, December 8, 2015 by Larry*

**Physics**

James Bond and the ever present bond girl are on a dirt bike escaping from a car load of bad guys. If we have the following conditions: James Bond’s mass is 84 Kg The Bond Girl is 48Kg The Dirt Bike’s mass is 113.6 Kg The tires on the dirt bike are 0.6m in diameter ...
*Tuesday, December 8, 2015 by Larry*

**physics**

A 150g iron ball is dropped into a cavity in a block of ice. The cavity is then found to contain 21g of water. Calculate the heat of fusion of ice.
*Tuesday, December 8, 2015 by omay*

**Physics **

A baseball player hits a home run over the left-field fence, which is 104 m from home plate. The ball is hit at a point 1.08 m directly above home plate, with an initial velocity directed 35.0° above the horizontal. By what distance does the baseball clear the 3.00 m high ...
*Tuesday, December 8, 2015 by Bill*

**Physics **

A brick is initially 12.90 cm high and an aluminum can is initially 12.91 cm high. By how much must their temperatures be raised in order for the brick and the can to have exactly the same height?
*Tuesday, December 8, 2015 by Dave*

**Physics **

A 1.05 liter flask contains a certain quantity of ideal gas at 305 K. Then an equal number of molecules of the same gas is added to the flask, after which the absolute pressure is 1.55 times its original value. What is the final temperature?
*Tuesday, December 8, 2015 by Dave*

**Physics **

By how much does the air pressure in a house increase if the house is sealed and the air temperature increases from 10.7° C to 21.0° C? The initial air pressure is 1.00 atmosphere.
*Tuesday, December 8, 2015 by Dave*

**Physics **

Find the volume occupied by 3.14 moles of an ideal gas at standard conditions of pressure and temperature (P = 1.00 atm, T = 273 K).
*Tuesday, December 8, 2015 by Dave*

**Physics **

A watertight car is submerged under water. What force is required to open a door of area 1.12 m2 if the average depth of water at the door is 1.50 m?
*Tuesday, December 8, 2015 by Dave*

**Physics **

A certain concrete will support a maximum compressive stress of 1.30 107 N/m2 before being crushed. A column of uniform width is to be made with this concrete. How tall can the column be if the stress in it at any point is not to exceed one half the maximum value? The weight ...
*Tuesday, December 8, 2015 by Dave*

**physics**

A box slides along a friction-less horizantal floor under the action of a constant applied force is the acceleration necessarily to be constant?
*Tuesday, December 8, 2015 by Marym*

**Physics **

A man doing a slow push-up is approximately in static equilibrium. His body is horizontal, with his weight of 750 N supported by his hands and feet, which are 1.36 m apart. One hand rests on a spring scale, which reads 268 N. If each hand bears an equal weight, how far from ...
*Tuesday, December 8, 2015 by Dave*