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November 24, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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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

Physics Science
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 5:56pm

physics
A 22-N force, parallel to the incline, is required to push a certain crate at a velocity of 6.1 up a frictionless incline that is 55° above the horizontal. The mass of the crate is:
Wednesday, November 5, 2014 at 5:54pm

Physics
A 250 g piece of tin at 99°C is dropped in 100 g of water at 10°C. If the final temperature of the mixture is 20°C, what is the specific heat of the tin?
Wednesday, November 5, 2014 at 5:47pm

Physics
A runner moving at a speed of 7.7 m/s rounds a bend with a radius of 21 m. What is the centripetal acceleration of the runner? My teacher doesn't explain anything very well and I don't understand how to figure it out.
Wednesday, November 5, 2014 at 5:42pm

physics
A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, perpendicular to each other, at 25 m/s. The third piece has twice the mass as the other two. 1. What is the speed of the third piece? 2. What is the direction of ...
Wednesday, November 5, 2014 at 5:09pm

physics
no idea how to do this problem A kid at the junior high cafeteria wants to propel an empty milk carton along a lunch table by hitting it with a 3.0g spit ball. If he wants the speed of the 40g carton just after the spit ball hits it to be 0.30 m/s, at what speed should his 3.0...
Wednesday, November 5, 2014 at 5:08pm

Physics - Method Of Mixtures
Mary mixes 5.00 lb of water at 200°F with 7.00 lb of water at 65.0°F. Find the final temperature of the mixture. -Specific Heat of water is 1.00 BTU/lbs°F
Wednesday, November 5, 2014 at 5:02pm

Physics Science
Mary mixes 5.00 lb of water at 200°F with 7.00 lb of water at 65.0°F. Find the final temperature of the mixture. -Specific Heat of water is 1.00 BTU/lbs°F
Wednesday, November 5, 2014 at 4:59pm

physics
A man standing on very slick ice fires a rifle horizontally. The mass of the man together with the rifle is 70 kg , and the mass of the bullet is 10 g If the bullet leaves the muzzle at a speed of 500 m/s, what is the final speed of the man?
Wednesday, November 5, 2014 at 4:46pm

physics
A small, 250\g cart is moving at 1.50m/s on a frictionless track when it collides with a larger, 4.00kg cart at rest. After the collision, the small cart recoils at 0.890m/s . What is the speed of the large cart after the collision?
Wednesday, November 5, 2014 at 4:44pm

physics
In a Little League baseball game, the 145 g ball enters the strike zone with a speed of 13.0 m/s. The batter hits the ball, and it leaves his bat with a speed of 21.0 m/s in exactly the opposite direction. 1. what is the magnitude of the impulse delivered by the bat to the ...
Wednesday, November 5, 2014 at 4:40pm

physics
An ice hockey puck slides along the ice at 15 m/s . A hockey stick delivers an impulse of 4.8kg/m/s causing the puck to move off in the opposite direction with the same speed. what is the mass of the puck?
Wednesday, November 5, 2014 at 4:35pm

Physics
If a 648 N body on a carpeted surface has a μs of 0.86 and a μk of 0.68, what amount of force will be required to start dragging the body across the floor? Make sure to report your answer with the correct number of significant figures Is this correct? 0.86*648*9.8= 5...
Wednesday, November 5, 2014 at 4:11pm

Physics
If a 648 N body on a carpeted surface has a μs of 0.86 and a μk of 0.68, what amount of force will be required to start dragging the body across the floor? Make sure to report your answer with the correct number of significant figures am I doing this right? 648*.68=440
Wednesday, November 5, 2014 at 3:21pm

physics
Speed in air is 340m.s Siren of ambulance emits waves of frequency 980Hz A detector at the scene measures the frequency as 1050Hz h0w d0 I w0rk this 0ut 1050 = 340 / 340 - vs (980) 1050 = 1 - vs (980) 1050 = -vs (980) 1050 + vs = 980 1050/1050 + vs = 980 / 1050 vs = 980 / 1050...
Wednesday, November 5, 2014 at 2:51pm

physics
A 755 N diver drops from a board 10.0m above the water's surface.Find the diver's speed 5.00 m above the water's surface. Then find the diver's speedjust before striking the water.
Wednesday, November 5, 2014 at 2:18pm

physics
If a 648 N body on a carpeted surface has a μs of 0.86 and a μk of 0.68, what amount of force will be required to start dragging the body across the floor? Make sure to report your answer with the correct number of significant figures
Wednesday, November 5, 2014 at 2:11pm

physics
A staging that weighs Wstaging supports a painter weighing 350 N. The reading on the left scale is 600 N and the reading on the right scale is 240 N. What is the weight of the staging?
Wednesday, November 5, 2014 at 12:10pm

physics
What is the work done by the two forces together in moving an object a distance of d = 5 m as shown in the diagram? The magnitude of each force is 19 N. Diagram: (The two forces, F1 and F2, have the same magnitud but F1 is 45º over de the x axis, and F2 is 45º below ...
Wednesday, November 5, 2014 at 11:29am

physics
The rope of a swing is 3.1 m long. Calculate the angle from the vertical at which a 77-kg man must begin to swing in order to have the same kinetic energy at the bottom as a 1430-kg car moving at 1.05 m/s (2.35 mi/hr).
Wednesday, November 5, 2014 at 11:22am

physics
A parachutist descends vertically a distance of 380 m at a constant speed of 2.9 m/s. The mass of the parachutist is 70 kg. What is the work done on the parachutist by the net force during this descent?
Wednesday, November 5, 2014 at 11:20am

Physics
Half life of radium is 44 years.The sample will reduce to 50% of its orignal value ater how many years?
Wednesday, November 5, 2014 at 9:30am

physics
It has been said that sometimes lead bullets melt upon impact. Assume that a bullet with an initial temperature of 301 K receives 73.9 % of the work done on it by a wall on impact as an increase in internal energy. (The melting point of lead is 601 K, the heat of fusion for ...
Wednesday, November 5, 2014 at 9:18am

physics
A cryogenic storage container holds liquid helium, which boils at 4.20 K. Suppose a student painted the outer shell of the container black, turning it into a pseudo-blackbody, and that the shell has an effective area of 0.791 m2 and is at 2.95·102 K. What is the rate at...
Wednesday, November 5, 2014 at 9:18am

physics
An air-cooled motorcycle engine loses a significant amount of heat through thermal radiation according to the Stefan-Boltzmann equation. Assume that the ambient temperature is T0 = 24.5°C (297.65 K). Suppose the engine generates 11.5 hp (8.58 kW) of power and, due to ...
Wednesday, November 5, 2014 at 9:17am

physics
A copper sheet of thickness 2.13 mm is bonded to a steel sheet of thickness 1.41 mm. The outside surface of the copper sheet is held at a temperature of 100.0°C and the steel sheet at 24.3°C. a) Determine the temperature (in °C) of the copper-steel interface. b) ...
Wednesday, November 5, 2014 at 9:16am

Physics
someone please answer these Physics Q answers no explanation 1 What is the opposite force to gravity 2 an example of a contact force 3 an example of a non-contact force 4 What effect does ‘mass’ have on inertia 5 two examples of forces that could slow an object down ...
Wednesday, November 5, 2014 at 7:28am

physics
A truck moves with a constant acceleration and covers a distance between two points 180 apart in 10 seconds. The velocity as it passes the second point is 30 m/s. Whats the acceleration of the truck ? whats the velocity in the first point ?
Wednesday, November 5, 2014 at 5:53am

physics
the speed of a train is reduced uniformly from 10 m/s to 5 m/s while covering a distance of 150 m. What is the acceleration of the train? how much farther will it travel before coming to rest, assuming the same acceleration ?
Wednesday, November 5, 2014 at 5:24am

pe
"Being an athlete takes more brains than brawn. It takes time and effort. It takes endurance and commitment. It takes an athlete who can stay in the air for 2.5 seconds while shooting a goal; an athlete who knows which laws of physics keep him there." Assess the ...
Wednesday, November 5, 2014 at 1:49am

physics
while cruising along dark stretch of highway at a speed of 25 m/s you see that bridge ahead has been washed out. you apply the breaks to and come to a stop in 4.0 sec construct the position vs time graph and acceleration vs time graph and motion graph for 4 sec interval
Wednesday, November 5, 2014 at 12:04am

physics
a motorcycle wants to jump a ditch 4m wide. he leaves one side on a ramp that slopes up at 30 above horizontal. he lands at the same elevation at which he took off. his front wheel leaves the ground 2m before the edge of the ditch and comes down 3 m past the far side of the ...
Tuesday, November 4, 2014 at 11:41pm

PHYSICS
What magnitude is not possible when a vector of magnitude 3 is added to a vector of magnitude 4?
Tuesday, November 4, 2014 at 11:39pm

Physics
A 4.9 kg block initially at rest is pulled to the right along a horizontal, frictionless surface by a constant, horizontal force of 14 N. Find the speed of the block after it has
Tuesday, November 4, 2014 at 11:05pm

Physics
An 8.00g bullet is fired at 220m/s into a 250g wooden block that is initially at rest. The bullet remains in the block and after the collision the two slide up a 30° incline. a. Solve for the velocity of the bullet-block after the collision. (ans: 6.82m/s) b. Determine ...
Tuesday, November 4, 2014 at 10:35pm

physics
During a neighborhood baseball game in a vacant lot, a particularly wild hit sends a 0.144-kg baseball crashing through the pane of a second-floor window in a nearby building. The ball strikes the glass at 14.9 m / s, shatters the glass as it passes through, and leaves the ...
Tuesday, November 4, 2014 at 8:55pm

physics
a standard coordinate system (+x to the right, +y upwards and +z out of the page) a particle with a positive charge is travelling in the +x direction when it encounters a magnetic field in the −y direction. In which direction will the magnetic force act on the particle?
Tuesday, November 4, 2014 at 8:41pm

Physics
gazelle traveling 200 m/s is launched at a 40 degree angle with respect to the horizontal.
Tuesday, November 4, 2014 at 8:32pm

physics
You are loading a refrigerator weighing 2250 N onto a truck, using a wheeled cart. The refrigerator is raised 1.00 m to the truck bed when it is rolled up a ramp. Calculate the minimum work that must be done by the force you apply and the magnitude of the force if the ramp is ...
Tuesday, November 4, 2014 at 8:24pm

Physics
A vector is directed at an angle tangent above the +x axis, pointing into the first quadrant. If the x component of this vector is 10 m, the magnitude of the vector is?
Tuesday, November 4, 2014 at 7:44pm

physics
Rocket-powered sleds are been used to test the responses of humans to acceleration. Start- ing from rest, one sled can reach a speed of 510 m/s in 2.37 s and can be brought to a stop again in 3.15 s. Find the acceleration of the sled while ac- celerating. Answer in units of m/...
Tuesday, November 4, 2014 at 7:37pm

physics
Tony Hawk skates down a ramp. If he is moving at 5.4 m/s at the bottom of the ramp and has a mass of 82 kg, how tall was the ramp?
Tuesday, November 4, 2014 at 7:26pm

physics
How fast will a roller coaster, with a mass of 1200 kg, be moving at the bottom of an 18 meter tall hill?
Tuesday, November 4, 2014 at 7:24pm

physics
Bobo jumps out of a plane 2,000 m in the air. If Bobo has a mass of 100 kg, how much kinetic energy will he have after falling for 200 m? Assume no air resistance.
Tuesday, November 4, 2014 at 7:23pm

physics
A team of sled rides has a mass of 180 kg. If they have 8,000 J of kinetic energy at the bottom of the hill, how tall was the hill they just tackled?
Tuesday, November 4, 2014 at 7:22pm

Physics
A wheel is rotating freely with an angular speed of 4840rad/s on a shaft whose moment of inertia is negligible. A second wheel, initially at rest and with 8 times the rotational inertia of the first is suddenly coupled to the same shaft. a) What is the angular speed of the ...
Tuesday, November 4, 2014 at 6:07pm

Science Physics
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F -specific heat for copper is 0.092-
Tuesday, November 4, 2014 at 6:06pm

physics
A 1100- kg car collides with a 1500- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 35 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...
Tuesday, November 4, 2014 at 5:45pm

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 ...
Tuesday, November 4, 2014 at 5:45pm

physics-distance
Here's a stationary bike. If you pedal such that the front wheel rotates at 6.9 rad/s, and that wheel's radius is half a meter, how far would you have gone in 35 minutes, if the bike where a non-stationary bike? (Assume a constant speed of rotation) I am not sure where...
Tuesday, November 4, 2014 at 5:29pm

physics
Find the height of a cliff if the 87.6 kg cliff diver hits the water at 15.5 m/s.
Tuesday, November 4, 2014 at 5:00pm

physics
A particle undergoes three successive displacement in a plane as follows 4m southwest, 5m east, 6m in a direction 60 degree north of east (a) draw an apropraite vector diagram to represcent the displacement (b) detarmine the displacement that would be required to bring the ...
Tuesday, November 4, 2014 at 4:14pm

physics
A one-piece cylinder is shaped as in the Figure, with a core section protruding from the larger drum. The cylinder is free to rotate around the central axis shown in the drawing. A rope wrapped around the drum, of radius 2.70 m, exerts a force F1 to the right on the cylinder. ...
Tuesday, November 4, 2014 at 4:01pm

Physics- linear acceleration
A wagon, starting from rest has a linear acceleration in the positive x direction of 0.3 m/s2. For the next 19 seconds, the wheels roll without slipping. The radius of each wheel is 37.4 cm. After this time, how many radians has each wheel rotated through?
Tuesday, November 4, 2014 at 3:56pm

physics
A block of mass m = 1.02 kg is suspended above the ground at a height h = 14.4 m by a spool with two arms. The spool-with- arms arrangement is a combination of a solid uniform cylinder of mass M = 3.43 kg and radius R = 0.440 m, and two rods, each of length l = 0.559 m and ...
Tuesday, November 4, 2014 at 3:18pm

physics
Suppose a bimetallic strip is constructed of copper and steel strips of thickness 1.23 mm and length 22.3 mm, and the temperature of the strip is reduced by 6.30 K. Determine the radius of curvature of the cooled strip (the radius of curvature of the interface between the two ...
Tuesday, November 4, 2014 at 3:04pm

physics
The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its ...
Tuesday, November 4, 2014 at 2:51pm

physics
Two masses are connected by a light string passing over a frictionless pulley as shown on Figure. The M2= 6.1 kg mass is released from rest at height h = 2.8 m . We are given that M1=2.7 kg and I, the moment of inertia of the pulley is I = 0.198 kg m2 and its radius is R = 0....
Tuesday, November 4, 2014 at 2:50pm

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