Wednesday

November 26, 2014

November 26, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Chemistry Physics**

How many joules of heat need to be removed to condense 1.50 kg of steam at 100°C -Specific Heat for steam is 2000 J/kg°C-
*Friday, November 7, 2014 at 7:41pm*

**Physics Math**

How many joules of heat need to be removed to condense 1.50 kg of steam at 100°C -Specific Heat for steam is 2000 J/kg°C-
*Friday, November 7, 2014 at 7:32pm*

**Physics Science**

How many kilocalories of heat are required to melt 20.0 kg of ice at 0°C? Okay so the given is m=20.0kg Ti=0°C HeatFusionIce=80 kcal/kg
*Friday, November 7, 2014 at 7:15pm*

**physics**

Two cars leave the same point at the same time, each travelling at the same constant speed of 89.0 km/h and each having the same mass. However, the first car drives directly east, while the second car heads directly south. At what speed (the magnitude of the velocity) is the ...
*Friday, November 7, 2014 at 6:40pm*

**Physics**

A pendulum consists of a 2.1 kg stone swinging on a 3.6 m string of negligible mass. The stone has a speed of 7.9 m/s when it passes its lowest point. (a) What is the speed when the string is at 60° to the vertical? (b) What is the greatest angle with the vertical that the...
*Friday, November 7, 2014 at 6:23pm*

**Physics**

A plane is flying horizontally with speed 251 m/s at a height 2180 m above the ground, a package is thrown downward from the plane with a vertical speed v1 = 80 m/s. What is the magnitude of the total velocity of the package at the moment it is thrown as seen by an observer on...
*Friday, November 7, 2014 at 5:07pm*

**Physics**

A target lies flat on the ground 4 m from the side of a building that is 10 m tall, as shown below. The acceleration of gravity is 10 m/s2 . Air resistance is negligible. A student rolls a 4 kg ball off the horizontal roof of the building in the direction of the target. The ...
*Friday, November 7, 2014 at 4:48pm*

**physics**

A cannon fires a 0.598 kg shell with initial velocity 10 m/s in the direction 46◦ above the horizontal. The shell’s trajectory curves downward be- cause of gravity, so at the time t = 0.53 s the shell is below the straight line by some verti- cal distance ∆h. ...
*Friday, November 7, 2014 at 4:46pm*

**physics**

A tank contains 12.2 g of chlorine gas (Cl2) at a temperature of 84 °C and an absolute pressure of 5.60 × 105 Pa. The mass per mole of Cl2 is 70.9 g/mol. (a) Determine the volume of the tank. (b) Later, the temperature of the tank has dropped to 26 °C and, due to...
*Friday, November 7, 2014 at 4:25pm*

**physics**

Find the displacement of the car after 5.9 s. Answer in units of m
*Friday, November 7, 2014 at 3:21pm*

**physics**

A steel ball of mass m=5 g is moving at a speed of 250 m/s toward a large mass M=2.2 kg which is connected to a relaxed spring, as shown below. When the ball reaches the large mass it collides and bounces off without losing any kinetic energy. The large mass is connected to a ...
*Friday, November 7, 2014 at 2:08pm*

**physics **

Static friction is smaller than kinetic friction because it is harder to keep an object than moving than to put it in motion.
*Friday, November 7, 2014 at 1:33pm*

**physics**

A remote-controlled toy car of mass 2.2 kg starts from rest at the origin at t = 0 and moves in the positive direction of an x axis. The net force on the car as a function of time is given by the figure. (a) What is the time rate of change of the momentum of the car at t = 3.0...
*Friday, November 7, 2014 at 12:53pm*

**physics**

A box is put on a scale that is marked in units of mass and adjusted to read zero when the box is empty. A stream of marbles is then poured into the box from a height h = 6.93 m above its bottom at a rate of R = 128 (marbles per second). Each marble has mass m = 7.14 g. If the...
*Friday, November 7, 2014 at 12:50pm*

**Physics**

If rocket had been 10 m above the ground when its horizontal distance from the launchpad was 2m ,wheredo you think rocket would have landed
*Friday, November 7, 2014 at 10:33am*

**Physics**

Power supplied to a particle of mass 2 Kg varies with time as p = 3t^2/2 watt. Here t is in seconds. If initial velocity = 0, find the velocity after 2s. Sorry for not proving my work. Frankly speaking I'm unable to solve any power questions. Any help would be appreciated. :)
*Friday, November 7, 2014 at 10:23am*

**Physics **

block slides across table with initial speed of 8 m/s coefficient of friction between block and table is .5 and table is 4 m long and 1.2 m high determine how far the block lands from the base of the table
*Friday, November 7, 2014 at 9:09am*

**Physics**

block of mass 3.5 kg slides down frictionless incline that is 10 m long and inclined at angle of 37 when reaches bottom of incline it collides perfectly inelastically with another block of mass 2 kg then slides along a level floor if coefficient of friction between the block ...
*Friday, November 7, 2014 at 8:50am*

**Physics**

A cannon is fired from the ground at an angle of 30 degrees. It is being shot an an initial velocity of 200m/s. What is the maximum height of the cannon ball? How fat will the cannon ball travel before it hits the ground
*Friday, November 7, 2014 at 8:43am*

**physics **

A coolant fluid has a latent heat of evaporation of 234 kj/kg . If the pump rate is 2250g per minute. How much thermal heat is removed each hour?
*Friday, November 7, 2014 at 6:03am*

**Physics**

a (n) 1510 kg car is moving along a level road at 13.8 m/s. The driver accelerates and in the next 10s the engine provides 23400 J of additional energy. If 3900 J of this energy must be used to overcome friction, what is the final speed of the car?
*Friday, November 7, 2014 at 1:17am*

**Physics**

An object is formed by attaching a uniform, thin rod with a mass of mr = 6.54 kg and length L = 5.12 m to a uniform sphere with mass ms = 32.7 kg and radius R = 1.28 m. Note ms = 5mr and L = 4R. 1)What is the moment of inertia of the object about an axis at the left end of the...
*Friday, November 7, 2014 at 1:05am*

**physics**

the formula of centripital accelaration is v>2/r Q:Why here is square of speed ?
*Friday, November 7, 2014 at 12:26am*

**physics**

find displacement 4 vectors (1) 40 meters @10, (2) 30 meters @ 190 and (1)50 meters @ 280
*Thursday, November 6, 2014 at 11:38pm*

**Physics**

What is the apparent weight of a 70-kg astronaut 3800 km from the center of the earth's moon in a space vehicle moving at constant velocity and acceleration toward the moon at 2.9m/s^2? State the direction in each case.
*Thursday, November 6, 2014 at 11:30pm*

**physics**

How high must your roof be to fire 1.2km if it fires at 450 m/s muzzle velocity?
*Thursday, November 6, 2014 at 11:29pm*

**physics**

A cannon rests on the ground at 40 degree angle it fires a ball at 200 m/s how high is the top of trajectory? At what impact speed does it rest? How far away does it land?
*Thursday, November 6, 2014 at 11:16pm*

**physics**

A jet needs to reach a takeoff speed of 75.0 m/s. If the runway is 1625 meters long, what minimum acceleration is needed? How much time will it take to reach the takeoff speed
*Thursday, November 6, 2014 at 10:37pm*

**physics**

A 0.027 kg golf ball moving at 16.8 m/s crashes through the window of a house in 4.6 × 10−4 s. After the crash, the ball contin- ues in the same direction with a speed of 12.0 m/s. Assuming the force exerted on the ball by the window was constant, what was the mag...
*Thursday, November 6, 2014 at 10:34pm*

**physics**

A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +1.2. What is the magnification when the convex side is used as a mirror, the object remaining the same distance from the mirror?
*Thursday, November 6, 2014 at 10:19pm*

**physics**

the mass of the sled as its two riders is 350kg he magnitude of the centripetal force that acts on the on the sled if the radius is 33m or 24m
*Thursday, November 6, 2014 at 10:12pm*

**Physics**

A spherical bowling ball with mass m = 3.2 kg and radius R = 0.107 m is thrown down the lane with an initial speed of v = 8.6 m/s. The coefficient of kinetic friction between the sliding ball and the ground is μ = 0.34. Once the ball begins to roll without slipping it ...
*Thursday, November 6, 2014 at 10:01pm*

**Physics**

You are holding the axle of a bicycle wheel with radius 35 cm and mass 1 kg. You get the wheel spinning at a rate of 55 rpm and then stop it by pressing the tire against the pavement. You notice that it takes 2.0 s for the wheel to come to a complete stop. What is the angular ...
*Thursday, November 6, 2014 at 9:52pm*

**physics**

A solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle θ = 30o. The sphere has mass M = 8 kg and radius R = 0.19 m . The coefficient of static friction between the sphere and the plane is μ = 0.64. What is the ...
*Thursday, November 6, 2014 at 9:52pm*

**physics**

A 244 g particle is released from rest at point A inside a smooth hemispherical bowl of ra- dius 21.7 cm, as shown in the figure The acceleration of gravity if 9.81 m/s2 .
*Thursday, November 6, 2014 at 9:12pm*

**Physics**

Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 2.40 m. Two of the spheres have a mass of 3.40 kg each. The third sphere (mass unknown) is released from rest. Considering only the gravitational forces that ...
*Thursday, November 6, 2014 at 9:02pm*

**physics**

A quarterback throws the football to a stationary receiver who is 22.7m down the field. the football is thrown at an initial angle of 39 degrees to the ground. The acceleration of gravity is 9.81m/s^2. a) at what initial speed must the quarterback throw the ball for it to ...
*Thursday, November 6, 2014 at 8:53pm*

**physics**

The coldest and hottest temperatures ever recorded in the United States are -83°F and 135°F, respectively. What is the speed of sound in air at each temperature?
*Thursday, November 6, 2014 at 8:50pm*

**Physics Help Please! Check the answer**

an athlete stretches a spring an extra 40.0 cm. how much energy has he transferred to the spring, if the spring constant is 5286.0 N/m? Us= 1/2kx^2 =1/2(5286.0)(.40)=1057.2 J Thanks!
*Thursday, November 6, 2014 at 8:45pm*

**physics**

A hiker begins a trip by first walking 25.0 km southeast from her base camp. On the 2nd day, she walks 40.0 km in a direction 600 north of east, at which point she discovers a forest rangers tower. Find the magnitude and direction of displacement from base camp.
*Thursday, November 6, 2014 at 8:42pm*

**physics**

For the ballistic missile aimed to achieve the maximum range of 15500 km, what is the maximum altitude reached in the trajectory? Answer in units of km
*Thursday, November 6, 2014 at 8:30pm*

**Physics**

Your friend Josh tells you that he spends less on gas in the winter than in the summer. He also says that he has to fill up his tank less often in the winter. (a) Which of the following are possible hypotheses that can be formed from Josh’s observations? (You can choose ...
*Thursday, November 6, 2014 at 8:21pm*

**physics**

An artillery shell is fired at an angle of 86◦ above the horizontal ground with an initial speed of 1630 m/s. The acceleration of gravity is 9.8 m/s 2 . Find the total time of flight of the shell, neglecting air resistance. Answer in units of min
*Thursday, November 6, 2014 at 8:13pm*

**physics**

An 11.8 g bullet leaves the muzzle of a rifle with a speed of 578.5 m/s. What constant force is exerted on the bullet while it is traveling down the 0.6 m length of the barrel of the rifle? Answer in units of N
*Thursday, November 6, 2014 at 8:13pm*

**physics**

A pelican flying along a horizontal path drops a fish from a height of 3.3 m. The fish travels 7.6 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s
*Thursday, November 6, 2014 at 8:02pm*

**physics**

A constriction in a pipe reduces its diameter from 7.9 cm to 1.8 cm . Where the pipe is wider, the fluid velocity is 8 m/s. Find the fluid velocity where the pipe is narrow. Answer in units of m/s
*Thursday, November 6, 2014 at 7:25pm*

**physics**

A circular swimming pool has a flat bottom and a 4.39 m diameter. It is filled with water to a depth of 1.51 m. There is 1.36 atm of pressure on the top surface.
*Thursday, November 6, 2014 at 7:17pm*

**physics**

What force F must be applied to the small piston to maintain the load of 49 kN at a constant elevation?
*Thursday, November 6, 2014 at 7:09pm*

**physics**

If the average gauge pressure in the vein is 14400 Pa, what must be the minimum height of the bag in order to infuse glucose into the vein? Assume that the specific gravity of the solution is 1.05. The acceleration of gravity is 9.8 m/s
*Thursday, November 6, 2014 at 6:57pm*

**physics**

A 1.2 lead ball is launched off a cliff top at 16 m/s Determine the balls kinetic energy at position P. Ignore friction
*Thursday, November 6, 2014 at 6:50pm*

**physics**

A 73 kg man in a 4.3 kg chair tilts back so that all his weight is balanced on two legs of the chair. Assume that each leg makes contact with the floor over a circular area of radius 1.5 cm. Find the pressure exerted on the floor by each leg. The acceleration of gravity is 9.8...
*Thursday, November 6, 2014 at 6:35pm*

**physics**

A 15 kg rock is horizontally from very high cliff at a speed of 65m/s. what is the speed of the rock after it has fallen a vertical distance of 35m?
*Thursday, November 6, 2014 at 6:10pm*

**Physics**

A. You drag a suitcase of mass 19 kg with a force of F at an angle 41.3 degrees with respect to the horizontal along a surface with kinetic coefficient of friction 0.54. The acceleration due to gravity is 9.8 m/s^2. What is the normal force on the suitcase? Answer in units of ...
*Thursday, November 6, 2014 at 4:08pm*

**physics**

The half-life of Th(227) is 18.72 days. It decays by alfa emission to Ra(223), an alfa emitter whose half-life is 11.43 days. A particular sample contains 10^6 [10E(+6)] atoms of Th(227) and no Ra(223) at time t=0. a) How many atoms of each type will be in the sample at t=15 ...
*Thursday, November 6, 2014 at 3:51pm*

**Physics**

41. A student pulls horizontally on a 12 kg box, which then moves horizontally with an acceleration of 0.2 m/s^2. If the student uses a force of 15 N, what is the coefficient of kinetic friction of the floor? Okay, so I know that the net force is 15 and the box weighs 12 kg. I...
*Thursday, November 6, 2014 at 3:25pm*

**Hurricane Project for Physics Class**

1) Please describe the typical path(s) for hurricanes. Is this part of the pattern of convection?
*Thursday, November 6, 2014 at 3:07pm*

**Physics**

An Escort and a Camaro traveling at right angles collide and stick together. The Escort has a mass of 1200 kg and a speed of 25 km/h in the positive x direction before the collision. The Camaro has a mass of 1700 kg and was traveling in the positive y direction. After the ...
*Thursday, November 6, 2014 at 2:21pm*

**physics**

a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds
*Thursday, November 6, 2014 at 1:51pm*

**physics**

a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds
*Thursday, November 6, 2014 at 1:50pm*

**physics**

What is the maximum speed that the car can turn in a curve of radius 29.0 m without slipping? The coefficient of static friction between a road and a car's tires is 0.500, and the coefficient of kinetic friction is 0.390. Assume that the road is horizontal and flat.
*Thursday, November 6, 2014 at 1:44pm*

**Physics**

I have a blue liquid with density 1040 +- 20 yellow liquid 1190 +- 60, (dark)red liquid 1170 +- 30 pink/light red liquid 1100 +- 60 my task is to find out what liquids are they all of the densities were calculated in class(we were doing an experiment).
*Thursday, November 6, 2014 at 1:35pm*

**Physics**

A ball of mass 0.60 kg is fired with velocity 100 m/s into the barrel of a spring gun of mass 2.4 kg initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. No energy is lost to friction. What fraction of ...
*Thursday, November 6, 2014 at 1:32pm*

**physics (work/nonconservative forces)**

An object moving along a horizontal track collides with and compresses a light spring (which obeys Hooke's Law) located at the end of the track. The spring constant is 47.3 N/m, the mass of the object 0.230 kg and the speed of the object is 1.80 m/s immediately before the ...
*Thursday, November 6, 2014 at 1:19pm*

**physics**

How many joules of heat are required to melt 20.0 kg of ice at 0°C?
*Thursday, November 6, 2014 at 1:11pm*

**physics**

if a load 1kg streches a cordby 1.2cm.what is the force constantof the cord?
*Thursday, November 6, 2014 at 1:04pm*

**Physics**

Three particles A, B, C start from the origin from the same time, A with velocity a along x-axis, B with velocity b along y-axis, C with velocity c in xy plane along a line x=y. What should be the magnitude of c so that they always remain collinear is (a). (a+b)/2 (b). √...
*Thursday, November 6, 2014 at 12:50pm*

**Physics**

Can someone, please help me out with this question. A uniform rectangular 91.21 kg refrigerator with height h = 2.069 m and width w = 1.153 m is pushed at a constant velocity across a level floor. The refrigerator is pushed in the horizontal direction halfway between the floor...
*Thursday, November 6, 2014 at 12:00pm*

**physics**

A car drives straight down toward the bottom of a valley and up the other side on a road whose bottom has a radius of curvature of 125mm . At the very bottom, the normal force on the driver is twice his weight.
*Thursday, November 6, 2014 at 11:58am*

**physics**

Daneil is bouncing on a trampoline. After a certain bounce he leaves the ground traveling at a speed of 2.54 m/s. How far into the air does he go? I need helllpppp I'm so bad a physics, I need to know what formula to use..
*Thursday, November 6, 2014 at 11:16am*

**Physics**

Explain how you would determine how much error there is between a vector addition and the real results.
*Thursday, November 6, 2014 at 9:16am*

**Physics**

1) What are the possible effects of a warming climate and rising sea levels on the number, intensity, and effects of hurricanes?
*Thursday, November 6, 2014 at 7:23am*

**Physics**

1) Please describe the structure of a hurricane,and how they work. Include a discussion of how energy is transferred from the warm ocean water up to the sky.
*Thursday, November 6, 2014 at 7:17am*

**physics**

A motorist has to travel 3.50 km in a city with an average speed not exceeding to 25 km/h . If the average speed increases to 40 km/h. What is time he will gain from his journey
*Thursday, November 6, 2014 at 7:10am*

**physics**

A motorist has to travel 3.50 km in a city with an average speed not exceeding 25 km/h. If the average speed increases to 40 km/h, fine the time he will gain in his journey
*Thursday, November 6, 2014 at 7:05am*

**Physics**

1) Please describe the typical path(s) for hurricanes. Is this part of the pattern of convection?
*Thursday, November 6, 2014 at 6:59am*

**physics**

A motorist has to travel 3.50 km in a city with an average speed not exceeding 25 km/h. If the average speed increases to 40 km/h, find the time he will gain in his journey.
*Thursday, November 6, 2014 at 6:30am*

**College physics**

In this problem you will estimate the heat lost by a typical house, assuming that the temperature inside is T(in) = 20 degrees celcius and the temperature outside is T(out) = 0 degrees celcius. The walls have fiberglass insulation, which dominates the heat conduction ...
*Thursday, November 6, 2014 at 3:40am*

**physics**

48 kg projectile is fired at an angle of 30 degree above the horizontal with an initial speed of 1.34 x10^2m/s fro the top of a cliff 150m above level ground, where the ground is taken to be y=0 what is the inital total mechanical energy of the projectile?'
*Thursday, November 6, 2014 at 1:55am*

**physics**

'a 48 kg projectile is fired at an angle of 30 degree above the horizontal with an initial speed of 1.34 x10^2m/s fro the top of a cliff 150m above level ground, where the ground is taken to be y=0 what is the inital total mechanical energy of the projectile?'
*Thursday, November 6, 2014 at 1:54am*

**physics**

A watermelon falls off of a balcony 14 meters high. How fast is it moving immediately before it reaches the ground? a increases with time b is 0 m/s c remains constant d decreases with time
*Wednesday, November 5, 2014 at 11:58pm*

**Physics**

A rubber ball with a mass of 0.130 kg is dropped from rest. From what height was the ball dropped, if the magnitude of the ball's momentum is 0.710 kg · m/s just before it lands on the ground?
*Wednesday, November 5, 2014 at 11:52pm*

**physics**

A cat slides off the table. Immediately before the cat leaves the table,what is the vertical velocity?
*Wednesday, November 5, 2014 at 11:33pm*

**Science, Physics**

A 800kg safe is 2.3m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 52cm.What is the spring constant of the spring?
*Wednesday, November 5, 2014 at 11:08pm*

**Chemistry Physics**

A steel pipe 8.25 m long is installed at 45°C. Find the decrease in length when coolants at -60°C pass through the pipe
*Wednesday, November 5, 2014 at 10:37pm*

**physics**

A ball is shot out of a spring and into a hollow ballast which then swings upwards 2.5 cm. The ball has a mass of 0.10 kg, the ballast has a mass of 0.50 kg and the spring constant is 500 N/m. How fast was the ballast-ball system moving immediately after impact? How fast was ...
*Wednesday, November 5, 2014 at 10:19pm*

**physics**

A 1000 kilogram car rolling on a horizontal surface has speed v= 45 kilometer per hour when it strikes a horizontal coil spring and is brought to rest in a distance of 2.2 meters. What is the spring stiffness constant of the spring?
*Wednesday, November 5, 2014 at 9:31pm*

**Physics**

A block of mass 0.45 kg can slide over a frictionless horizontal surface. It is attached to a spring whose stiffness constant is k = 18 N/m. The block is pulled 38 cm and let go. a)What is its maximum speed? b)What is its speed when the extension is 30 cm? c)At what position ...
*Wednesday, November 5, 2014 at 9:24pm*

**Physics**

a point 22 caliber rifle fires a 1.8 gram bullet at a 400m/s into a block of wood. If the bullet penetrates to a depht of 10cm find the desaceleration of the bullet. The force exerheted on the bullet, and the time.
*Wednesday, November 5, 2014 at 9:21pm*

**Physics Science**

How many grams of water at 20°C are necessary to change 800g of water at 90°C to 50°C? so its setup like (20*1.00)*(90-50)+(20*1.00)*(90-50) = 1600g?
*Wednesday, November 5, 2014 at 9:16pm*

**Physics Help Please!**

A block of mass is moving along the horizontal frictionless surface with a speed of 5.70 m/s. If the slope is 11.0° and the coefficient of kinetic friction between the block and the incline is 0.260, how far does the block travel up the incline? Show step by step please! ...
*Wednesday, November 5, 2014 at 8:04pm*

**Physics**

An object of mass 1.00 kg is attached to a vertical spring with spring constant 100 N/m. The object is held at rest in a position such that the spring is stretched upward a distance 1.00 cm beyond its undisturbed length. If the object is released, how far will it drop before ...
*Wednesday, November 5, 2014 at 7:35pm*

**physics **

how do I solve for angular momentum if the weight its 700 g and the angular v is (1m=r, 120rmp). I get 12.56 for the v. But i don't know how to solve for the monentum. Also is my v correct?
*Wednesday, November 5, 2014 at 7:22pm*

**Physics**

A mass of 2.0kg traveling at 3.0 m/s along a horizontal plane hits a relaxed spring 20cm away from it. The coefficient of kinetic friction is 0.3. The mass is slowed to zero velocity when the spring has been compressed. By how much the spring has been compressed, the spring ...
*Wednesday, November 5, 2014 at 7:21pm*

**Physics**

A large flatbed truck hauls a heavy wood crate as shown. The crate is not tied down and simply rests on the metal bed of the truck. Find the maximum acceleration the truck can have if the crate is not to slide along the truck bed. (Static friction is 0.5 and kinetic friction ...
*Wednesday, November 5, 2014 at 7:21pm*

**Physics **

A girl coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 6.7 m/s. The coefficient of kinetic friction between runners and snow is 0.038, and the girl and sled together weigh 603 N. The acceleration of gravity is 9.8 m/s2 . How far does the ...
*Wednesday, November 5, 2014 at 7:14pm*

**Physics**

A simple pendulum of length 2.00m is made with a mass of 2.00kg. The mass has speed of 3.00 m/s when the pendulum is 30 degrees above its lowest position. -What is the maximum angle away from the lowest position the pendulum will reach? -What is the speed of the mass when the ...
*Wednesday, November 5, 2014 at 7:12pm*

**physics**

Two blocks connected by a string are pulled across a rough horizontal surface by a force applied to one of the blocks, as shown. The acceleration of gravity is 9.8 m/s Block 1 has a mass of 5 kg while block two has a mass of 8 kg. A string is tied to the 8 kg block pulling up ...
*Wednesday, November 5, 2014 at 6:59pm*

**physics**

A man skis down from the top of a hill 1500.0 m high, starting from rest. If he loses 50% of his initial mechanical energy to friction during his descent, what is his speed in m/s at the base of the hill?
*Wednesday, November 5, 2014 at 6:35pm*

**physics**

A 74.0 kg ice skater moving to the right with a velocity of 2.14 m/s throws a 0.12 kg snowball to the right with a velocity of 24.2 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*Wednesday, November 5, 2014 at 6:25pm*

**Chemistry Physics**

How many grams of water at 20°C are necessary to change 800g of water at 90°C to 50°C?
*Wednesday, November 5, 2014 at 6:10pm*

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