Sunday

June 26, 2016
**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*

**College Physics**

How much energy is required to bring 10.0 grams of ice at -5.00 degrees to 105-degree steam? Assume the system is isolated so that no mass is lost to the surroundings
*Tuesday, December 8, 2015 by Jeff*

**Physics**

A ceiling fan of radius 1.0 m is rotating with a frequency of 300 RPM. How fast (in m/sec) is the tip of one of the blades moving?
*Tuesday, December 8, 2015 by Anonymous*

**Physics**

A 45.0 kg diver steps off a 8.0 m high diving board and drops straight down into the water. If the diver comes to rest 5.0 m below the surface of the water, determine the average resistance force exerted on the diver by the water.
*Tuesday, December 8, 2015 by Help!!!!*

**chemistry physics**

Which following assertions are true ? - unanswered 13C NMR is more sensitive than 1H NMR because of the 1.1% natural abundance of 13C nuclei. 13C nuclei have a ½ spin and can be detected in NMR, opposite to more abundant 12C nuclei. 13C NMR requires a different ...
*Tuesday, December 8, 2015 by Abd*

**physics**

A) Assume the mass of a pendulum is 3kg. Calculate the work done by the pendulum on the mass from 0 degrees to 180 degrees ( you will need to integrate with respects to d(theta ) instead of dx given: the mass at the end of the string experiences a restoring force given by: F=-...
*Tuesday, December 8, 2015 by Spice*

**Physics**

A 50 gram mass vibrates in SHM at the end of a spring. The amplitude of the motion is 0.12 meters, and the period is T= 1.70 seconds. Find: The maximum acceleration of the mass? The speed of the mass when the displacement is 0.06 meters?
*Monday, December 7, 2015 by Justin *

**physics**

A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 515 N. As the drawing shows, she is closer to the left cliff than to the right cliff, with the result that the tensions in the left and right sides of the rope are not the ...
*Monday, December 7, 2015 by Elijah*

**Physics**

A drone capable of flying north at a speed of 4.0 m/s in still air is attempting to fly across a field 120 m wide. There is a wind blowing at 5.0 m/s [E]. a) Find the drone's velocity relative to the ground. b) Find the time it takes the drone to cross the field.
*Monday, December 7, 2015 by Taha*

**physics**

The acceleration of gravity is 10 m/s2. What is the acceleration of a 46 kg pail of cement that is pulled upward (not sideways) with a force of 478 N? Answer in units of m/s2.
*Monday, December 7, 2015 by zach*

**physics**

A pinball machine launches a 139 g ball with a spring-driven plunger. The game board is inclined at 8 ◦ above the horizontal. Assume: The plunger’s mass and frictional effects are negligible. The acceleration of gravity is 9.8 m/s2 Find the force constant k of the ...
*Monday, December 7, 2015 by Anonymous*

**physics**

On planet X, an object weighs 18.1 N. On planet B where the magnitude of the free-fall acceleration is 1.28 g (where g = 9.8 m/s 2 is the gravitational acceleration on Earth), the object weighs 37.9 N. The acceleration of gravity is 9.8 m/s 2 . What is the mass of the object ...
*Monday, December 7, 2015 by zach*

**Physics**

1. A 55.0 kg pole vaulter running at 11.0 m/s vaults over the bar. Assuming that the vaulter's horizontal component of velocity over the bar is 1.0 m/s and disregarding air resistance, how high was the jump (include units)? 2. A 71 kg person rolls on a 2 kg skateboard with...
*Monday, December 7, 2015 by Help!!!!*

**physics**

if a worker pushes a box 3 times as far as you do and exerts double the force you applied, which one of you does more work and by how much?
*Monday, December 7, 2015 by bshayer*

**physics **

A) Assume the mass of a pendulum is 3kg. Calculate the work done by the pendulum on the mass from 0 degrees to 180 degrees ( you will need to integrate with respects to d(theta ) instead of dx given: the mass at the end of the string experiences a restoring force given by: F=-...
*Monday, December 7, 2015 by Spice*

**Physics Help**

A dumbbell has a mass m on either end of a rod of length 2a. The center of the dumbbell is a distance r from the center of the Earth, and the dumbbell is aligned radially. If r≫a, the difference in the gravitational force exerted on the two masses by the Earth is ...
*Monday, December 7, 2015 by jacob*

**physics**

A 56-kg student runs at 4.2 m/s , grabs a hanging 10.0-m-long rope, and swings out over a lake (Figure 1) . He releases the rope when his velocity is zero. What is the angle θ when he releases the rope? What is the tension in the rope just before he releases it? What is ...
*Monday, December 7, 2015 by Andres *

**Physics**

A star the size of our Sun runs out of nuclear fuel and, without losing mass, collapses to a white dwarf star the size of our Earth. The radius of our Sun is 6.96×108m , the radius of Earth is 6.37×106m . If the star initially rotates at the same rate as our Sun, ...
*Sunday, December 6, 2015 by Viert*

**Physics**

A fish tank has dimensions 46 cm wide by 1.0 m long by 0.70 m high. If the filter should process all the water in the tank once every 3.0 h, what should the flow speed be in the 3.0-cm-diameter input tube for the filter? I tried using Q=v/t and Q=vA... V=0.46m*1m*0.7m=0.322m^3...
*Sunday, December 6, 2015 by Ashley*

**Physics**

A man which travel due north in other to cross a river 5km wide flowing due east at 3km/h. If he can roll at 10km/h in still water. Find either by scale drawing or by calculation (1) the direction in which he must head is boat in order to get to his destination (2) the ...
*Sunday, December 6, 2015 by Dickson*

**Physics**

A steel bar has an initial length of 40 meters when the temperature is 20 oC. At what final temperature will the steel bar have a final length of 40.01 meters? The coefficient of linear expansion of steel is 12E-6 (1/C).
*Sunday, December 6, 2015 by Justin *

**Physics**

A certain diving bell for use in the ocean has a square window measuring 0.250 m on each side. The inside of the bell is pressurized and maintained at a pressure of 2.00 atm. The mass density of seawater is 1025 kg/m3. How deep can this bell be lowered before the vector sum of...
*Sunday, December 6, 2015 by Ethan*

**physics**

1) A 70 kg woman dives from a 2.5 m high diving board. The gravitational field strength is 10 N/kg. Describe whether she gains or loses gravitational potential energy, and calculate the change in gravitational potential energy
*Sunday, December 6, 2015 by kate*

**Algebra 1, Physics**

Muriel and Connie are playing a game of catch. They decided it would be fun to stand on different sides of the building and throw the ball back and forth. Muriel can throw the ball with a velocity of 14 m/s, and Connie can throw with a velocity of 16 m/s. Each stands 10 m from...
*Sunday, December 6, 2015 by Missy*

**physics**

Two plus lenses have focal lengths in the ratio 7:1. When placed together in close contact the focal length of the combination is +12.5cm. What are the focal lengths of the two lenses?
*Sunday, December 6, 2015 by shaky*

**physics**

When a body hanging from a spring balance is immersed in water it floats just below the surface of water and shows 100g loss in its weight (I) what is the weight of the body in water? (Ii) what is the weight of the body in air? (Iii) what is the up thrust on the body? (Iv) ...
*Sunday, December 6, 2015 by farheen fathima*

**Physics**

Some bags (the mass of each bag is 50 kg) are put in the truck of 200 kg mass. After applying 400 N force the car started moving with 1 m/s accelaration.Now my question is'', how many Bags are in the truck?
*Sunday, December 6, 2015 by Akhter*