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October 23, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
What electric field strength would store 17.5J of energy in every 9.00mm3 of space?
Sunday, September 7, 2014 at 9:55pm

Physics
A Honda Civic travels in a straight line along a road. Its distance x from a stop sign is given as a function of time t by the equation x(t)= α t^2− β t^3, where α = 1.54m/s2 and β = 5.05×10−2m/s^3 . Calculate the average velocity of the ...
Sunday, September 7, 2014 at 9:13pm

Physics
Two 0.75m -long pendulums hang side by side. The masses of the pendulum bobs are 65g and 85g . The lighter bob is pulled aside until its string is horizontal and is then released from rest. It swings down and collides elastically with the other bob at the bottom of its arc.To ...
Sunday, September 7, 2014 at 9:01pm

Physics
A car travels in the +x-direction on a straight and level road. For the first 5.00s of its motion, the average velocity of the car is V = 7.11m/s . How far does the car travel in 5.00s ? Thank you!
Sunday, September 7, 2014 at 8:53pm

physics
A rifle with a muzzle velocity of 480 m/s shoots a bullet at a target 45.6 m away. How high above the target must the rifle barrel be pointed to ensure that the bullet will hit the target? Neglect air resistance.
Sunday, September 7, 2014 at 8:31pm

AP Physics C
as she pick up her riders a bus driver traverses four successive displacements represented by the expression (-6.30 b)i-(4.00 b cos 40)i-(4.00 sin 40)j+(3.00 b cos 50)i-(3.00 b sin 50)j-(5.00 b)j here b represents one city block,a convenient unit of distance of uniform size; i...
Sunday, September 7, 2014 at 8:10pm

physics
How long will it take a cat to run 8.2m [N] at an average velocity of 3.7m/s [N]
Sunday, September 7, 2014 at 7:21pm

Physics
A 330.0 g block is dropped onto a vertical spring with a spring constant k = 234.0 N/m. The block becomes attached to the spring, and the spring compresses 0.26 m before momentarily stopping. A) While the spring is being compressed, what what is the change in the objects ...
Sunday, September 7, 2014 at 6:55pm

Physics
At one instant a bicyclist is 40 m due east of a park's flagpole, going due south with a speed of 18 m/s. Then, 23 s later, the cyclist is 55 m due north of the flagpole, going due east with a speed of 12 m/s. For the cyclist in this 23 s interval, find each of the ...
Sunday, September 7, 2014 at 6:38pm

physics
Two rockets are flying in the same direction and are side by side at the instant their retrorockets fire. Rocket A has an initial velocity of +4100 m/s, while rocket B has an initial velocity of +9400 m/s. After a time t both rockets are again side by side, the displacement of...
Sunday, September 7, 2014 at 5:41pm

physics
A ball is thrown straight up with an initial speed of 60 m/s. How high does it go? Assume the accelera- tion of gravity is 10 m/s22
Sunday, September 7, 2014 at 4:53pm

college physics
A 49-kg lead ball is dropped from the leaning tower of Pisa. The tower is 54 m high. (a) How far does the ball fall in the first 2.4 seconds of flight? (b) What is the speed of the ball after it has traveled 4.1 m downward? (c) What is the speed of the ball 1.7 s after it is ...
Sunday, September 7, 2014 at 4:51pm

physics
In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints to a speed of 11.0 m/s in 2.58 s. Assuming that the player accelerates uniformly, determine the distance he runs.
Sunday, September 7, 2014 at 4:24pm

physics
Over a time interval of 2.17 years, the velocity of a planet orbiting a distant star reverses direction, changing from +19.3 km/s to -22.9 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s2) during this interval. ...
Sunday, September 7, 2014 at 4:03pm

Physics
An 84.9 kg man is standing on a frictionless ice surface when he throws a 2.00kg book at 11.1m/s. With what velocity does the man move across the ice?
Sunday, September 7, 2014 at 3:41pm

Physics
A car slows from 23 m/s to 3.4 m/s at a constant rate of 2.1 m/s2. How many seconds are required before the car is traveling at 3.4 m/s?
Sunday, September 7, 2014 at 3:31pm

Physics
Two trains are approaching each other, one at 23 mph and the other at 37 mph. How far apart are they one minute before collision?
Sunday, September 7, 2014 at 2:10pm

physics
A net force of 5000.0 N accelerates a car from rest to 93.3 km/h (meter per second) in 4.1s (a)what is the mass of the car? (b) What is the weight of the car?
Sunday, September 7, 2014 at 2:07pm

physics
Due to continental drift, the North American and European continents are drifting apart at an average speed of about 3 cm per year. At this speed, how long (in years) will it take for them to drift apart by another 658.1 m?
Sunday, September 7, 2014 at 1:46pm

physics
Clint Dempsey takes a free kick and kicks a soccer ball with a mass of 440 grams at 98 miles per hour. what is the momentum
Sunday, September 7, 2014 at 1:26pm

Physics
A particle moves according to the equation x(t) = (10 m/s2) t2 where x is in meters and t is in seconds. Find the average velocity for the time interval from t1 = 2.0 s to t2 = 3 s. Answer in units of m/s. Please help! I have no idea how to set this up :(
Sunday, September 7, 2014 at 12:58pm

physics
A person swims with a speed v realative to water What dose this mean?
Sunday, September 7, 2014 at 8:31am

Physics
Two point charges are located on the y axis as follows: charge q1 = -2.50nC at y1 = -0.700m , and charge q2 = 3.30nC at the origin (y = 0). What is the magnitude of the net force exerted by these two charges on a third charge q3 = 9.00nC located at y3 = 0.250m ? What is the ...
Sunday, September 7, 2014 at 4:18am

Physics
Two small plastic spheres are given positive electrical charges. When they are 11.0cm apart, the repulsive force between them has magnitude 0.300N. What is the charge on each sphere if one sphere has four times the charge of the other?
Sunday, September 7, 2014 at 4:16am

Physics
A charge q1 = 5.00nC is placed at the origin of an xy-coordinate system, and a charge q2 = -2.00nC is placed on the positive x axis at x= 4.00cm . If a third charge q3 = 6.50nC is now placed at the point x= 4.00cm , y= 3.00cm find the x and y components of the total force ...
Sunday, September 7, 2014 at 4:12am

physics
the net external force on a golf cart is 390 n north. if the cart has a total mass of 220 kg. what is the magnitude and direction of its acceleration
Sunday, September 7, 2014 at 2:19am

physics
A spacecraft of mass 3.5 x 102kg was moving at 1.5 x 102ms-1 when its motor, operating at 8.4 x 102 kW fired for 5.0s Find the new velocity acquired by the spacecraft I dont know how to find the new velocity i found the work Power = w/t 840 x 5 = W 4200J = W Dont know what to ...
Saturday, September 6, 2014 at 10:06pm

Physics
You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.5 m above the ground, and it is moving at a speed of 8.0 m/s. (a) How much time does it take for the tennis ball to reach its maximum height? (b) What is the maximum height above ...
Saturday, September 6, 2014 at 7:53pm

Physics for Technology
I have been out of school 27 years; no Algebra or Trigonometry training: only remedial math. This class is part of a Diploma program, no placement test required - I am out of my depth. I had a tutor for an hour last Tues., with another appt. this Tues. Yet, like I told my ...
Saturday, September 6, 2014 at 7:36pm

physics
In reaching her destination, a backpacker walks with an average velocity of 1.22 m/s, due west. This average velocity results, because she hikes for 5.61 km with an average velocity of 2.69 m/s due west, turns around, and hikes with an average velocity of 0.367 m/s due east. ...
Saturday, September 6, 2014 at 7:26pm

physics
A skateboarder shoots off a ramp with a velocity of 6.4 m/s, directed at an angle of 54° above the horizontal. The end of the ramp is 1.4 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point ...
Saturday, September 6, 2014 at 7:14pm

Physics II
What is the sign and magnitude of a point charge that produces a potential of -2.00 V at a distance of 3.00 mm?
Saturday, September 6, 2014 at 3:20pm

Physics II
What is the sign and magnitude of a point charge that produces a potential of -2.00 V at a distance of 3.00 mm?
Saturday, September 6, 2014 at 3:15pm

Physics
A wooden bridge crossing a canyon consists of a plank with length density λ = 2 kg/m suspended at h = 10.0 m below a tree branch by two ropes of length L = 2h and with a maximum rated tension of 2000 N, which are attached to the ends of the plank, as shown in the figure. ...
Saturday, September 6, 2014 at 12:39pm

physics
A flat circular plate of copper has a radius of 0.278 m and a mass of 42.6 kg. What is the thickness of the plate? answer in units of m
Saturday, September 6, 2014 at 12:31pm

physics
Two objects with masses 2.0 and 3.0 kg move toward each other, both with speeds V0 = 5.0 m/s. They collide head on and stick together. (a) Calculate their final velocity. (b) Calculate the amount of kinetic energy lost during the process. (c) Suppose the two masses approach ...
Saturday, September 6, 2014 at 12:29pm

Physics Help!!!!
Describe what it means (describe the motion) if the acceleration vector has the same direction as the velocity vectors, and what it means if the acceleration vector has the opposite direction as the velocity vectors. Consider all four possibilities and explain what would ...
Saturday, September 6, 2014 at 11:20am

physics
A bus accelerates at 1.4 m/s2 from rest for 14 s. It then travels at constant speed for 23 s, after which it slows to a stop with an acceleration of magnitude 1.3 m/s2.
Saturday, September 6, 2014 at 11:19am

Physics
1.A bus travels 400 m between two stops. It starts from rest and accelerates at 1.50 m/s^2 until it reaches a velocity of 9.00 m/s. The bus continues at this velocity and then decelerates at 2 m/s^2 until it comes to a halt. Find the total time required for the journey. 2.A 28...
Saturday, September 6, 2014 at 3:11am

Physics
A ball is thrown vertically upward from the ground with a speed of 36.0 m/s.Suppose the acceleration of gravity were only 2.00 m/s^2 instead of 9.80 m/s^2 a)At what time does it have a velocity of 12.0 m/s upward? b)At what time does it have a velocity of 12.0 m/s downward? c)...
Saturday, September 6, 2014 at 3:00am

Physics
What is the connection between Weber’s Law, Fechner’s Law, and Steven’s Power Law
Saturday, September 6, 2014 at 2:00am

physics
a fire hose hold near the ground shoots water at speed of 6.8 m/s at what angle(s) should the nozzle point in order that the water land 2 dm away why are there two diffent angles?
Saturday, September 6, 2014 at 1:39am

Physics Help!!!!
Describe what it means (describe the motion) if the acceleration vector has the same direction as the velocity vectors, and what it means if the acceleration vector has the opposite direction as the velocity vectors. Consider all four possibilities and explain what would ...
Friday, September 5, 2014 at 11:54pm

Physics
Two small pith balls, each of mass m = 17.4 g, are suspended from the ceiling of the physics lab by 1.2 m long fine strings and are not moving. If the angle which each string makes with the vertical is = 17.9°, and the charges on the two balls are equal, what is the ...
Friday, September 5, 2014 at 11:22pm

Physics
Instructions for finding a buried treasure include the following: Go 745.6 paces at 298◦, turn to 204◦ and walk 178 paces, then travel 490 paces at 55◦ Find the magnitude of the resultant displacement from the starting point. Answer in Units of paces. (Part ...
Friday, September 5, 2014 at 11:20pm

physics
On a safari, a team of naturalists sets out toward a research station located 5.54 km away in a direction 47.9 ° north of east. After traveling in a straight line for 1.29 km, they stop and discover that they have been traveling 24.6 ° north of east, because their ...
Friday, September 5, 2014 at 10:53pm

AP Physics
A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.90 s after the ball is released from his hands. What is the speed of the ball? The speed of sound is 340 m/s. Answer ...
Friday, September 5, 2014 at 10:44pm

AP Physics
Two locomotives approach each other on parallel tracks. Each has a speed of v = 85 km/h with respect to the ground. If they are initially d = 7.0 km apart, how long will it be before they reach each other?
Friday, September 5, 2014 at 10:44pm

AP Physics
A car traveling 92 km/h is 130 m behind a truck traveling 75 km/h. How long will it take the car to reach the truck?
Friday, September 5, 2014 at 10:43pm

Physics
A cannon fires a shell straight upward; 2.1 s after it is launched, the shell is moving upward with a speed of 20 m/s. Assuming air resistance is negligible, find the speed (magnitude of velocity) of the shell at launch and 4.7 s after the launch.
Friday, September 5, 2014 at 7:18pm

physics
Two forces are applied to a tree stump to pull it out of the ground. Force A has a magnitude of 2880 newtons (N) and points 42.0 ° south of east, while force B has a magnitude of 4360 N and points due south. Using the component method, find the (a) magnitude and (b) ...
Friday, September 5, 2014 at 7:17pm

Physics, Electricity and Magnetism, Sciences
Two small pith balls, each of mass m = 17.4 g, are suspended from the ceiling of the physics lab by 1.2 m long fine strings and are not moving. If the angle which each string makes with the vertical is = 17.9°, and the charges on the two balls are equal, what is the ...
Friday, September 5, 2014 at 7:15pm

Physics
Two bicyclists, starting at the same place, are riding toward the same campground by different routes. One cyclist rides 1030 m due east and then turns due north and travels another 1480 m before reaching the campground. The second cyclist starts out by heading due north for ...
Friday, September 5, 2014 at 7:12pm

Physics
A ball is thrown from the ground. Its velocity after 4 ^ ^ seconds is (15x -3y ) m/s. the range of the ball is 205 m. 189 m. 111 m. 98 m.
Friday, September 5, 2014 at 6:54pm

Physics
A flight traffic controller is watching two planes. One is 20.0 km away in a direction 35.0º west of north at an altitude of 1650 m. The other is 18.0 km away in a direction 75.0º north of east at an altitude of 1420 m. How far apart are the two planes? Ax = 20.0km*...
Friday, September 5, 2014 at 6:27pm

Physics
Should a veterinarian be skeptical if someone said that her adult collie weighed 40.0N ? Should a nurse question a medical chart which showed that an average-looking patient had a mass of 200kg ?
Friday, September 5, 2014 at 5:54pm

Physics
X=1/2at^2 Solve for a Solve for t Can you please show me how to do this Thank u
Friday, September 5, 2014 at 4:45pm

Physics
A speeding motorcyclist is traveling at a constant speed of 31.1 m/s when he passes a police car parked on the side of the road. The radar, positioned in the police car's rear window, measures the speed of the motorcycle. At the instant the motorcycle passes the police car...
Friday, September 5, 2014 at 2:27pm

Physics
A rock is dropped into a deep hole and 2.2 s later the sound of striking the bottom is heard. If the speed of sound is 340 m/s, what is the depth of the hole?
Friday, September 5, 2014 at 1:30pm

Physics(Need Help please)
Four equal charged +Q are placed at the corners of a square of side a. Find the electric field strength at the midpoint of one side. Express your answer in terms of Q, a, and the constant k
Friday, September 5, 2014 at 12:44pm

Physics
Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 2.26 × 10-11 m. Determine the magnitude of the electron's ...
Friday, September 5, 2014 at 9:00am

AP Physics
A jogger runs in a straight line with an average velocity of 7.7 m/s for 4.5 minutes, and then with an average velocity of 2.8 m/s for 2.8 minutes. What is her total displacement? Answer in units of m.
Thursday, September 4, 2014 at 9:49pm

physics
a pitched ball is hit by a batter at a 45 degree angle and it just clears the outfield fence, 110m away. If the fence is at the same height as the pitch, find the velocity of the ball when it left the bat. Ignore air resistance.
Thursday, September 4, 2014 at 8:26pm

Physics
A sailboat travels 45km eastward at a speed of 20km/hr. The wind then drops, and the boat continues due east with a speed of 15km/hr for 25km. a.How long did it take the boat to travel 55km? b. What was the average velocity for the trip?
Thursday, September 4, 2014 at 8:17pm

Physics
A sailboat travels 45km eastward at a speed of 20km/hr. The wind then drops, and the boat continues due east with a speed of 15km/hr for 25km.
Thursday, September 4, 2014 at 8:15pm

Physics
Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 2.26 × 10-11 m. Determine the magnitude of the electron's ...
Thursday, September 4, 2014 at 7:37pm

Physics
For any given quadrupole, let the charges be +q, −q, +q, and −q at the corners of the square, and l be the side of the square. Calculate approximately the electric potential and the electric field far away from the quadrupole, IN THE THREE-DIMENSIONAL SPACE. You ...
Thursday, September 4, 2014 at 3:48pm

Physics
A sphere of radius R has inhomogeneous charge distribution on its surface. Its surface charge density is σ = σ0 cos θ, where σ0 is a positive constant, and θ is the angle from the “north pole” to the point of interest and satisfies 0 ≤...
Thursday, September 4, 2014 at 3:47pm

physics
A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 m/s. How long was the ball in the air? Round the answer to the nearest tenth of a second.
Thursday, September 4, 2014 at 3:18pm

physics
A stone is launched straight up by a slingshot. Its initial speed is 20.6 m/s and the stone is 1.59 m above the ground when launched. How high above the ground does the stone rise? How much time elapses before the stone hits the ground?
Thursday, September 4, 2014 at 1:15pm

Physics
The brightness of a light source at a distance of 100m from the source is 40 units. What would be the brightness if the distance is reduced to 50m?
Thursday, September 4, 2014 at 1:04pm

physics
Two identical small spherical conductors (point charges), separated by 0.6 m, carry a total charge of 200 mu or micro CC. They repel one another with a force of 120 N. (For the universal constant k use the value 8.99 times 109 N m2/C2.) so I used q1 + q2= 200e-6C and q1*q2= Fr...
Thursday, September 4, 2014 at 11:42am

Physics
An object has a initial velocity of 10 m/s in the positive x direction. Under a constant acceleration it stops after undergoing a displacement of 148.3 m in the positive x direction. Because it is still under the same acceleration it then travels back in the negative in the x ...
Thursday, September 4, 2014 at 11:39am

Physics
'An air rifle pellet of mass 2g is fired into a block of plasticine mounted on a model railway truck. the truck and plasticine have a mass of .1kg. The truck moves off after the pellet hits the plasticine with an initial velocity of .8m/s. calculate the momentum of the ...
Thursday, September 4, 2014 at 8:44am

physics
A car is moving at 90 km/h when the driver notices an animal that is about to cross the road 100 m away and he decides to apply the brakes. The reaction time of the driver is 0.3 s. Calculate the acceleration of the car when it stopped and the time taken from the time the ...
Thursday, September 4, 2014 at 7:01am

Physics
Two identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 36.3 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the ground beneath the cliff. Gun...
Thursday, September 4, 2014 at 4:12am

physics
if |vector a+ vector b| = |vector a- vector b|find the angle between a and b
Thursday, September 4, 2014 at 1:09am

Physics
What is the application of simple harmonic motion to our daily lives?
Wednesday, September 3, 2014 at 11:32pm

Physics
Find the average velocity (in m/s) of an object that starts 200 meters north of town and is 1200 meters north of town after 200 seconds.
Wednesday, September 3, 2014 at 11:22pm

Physics
-Use upward as positive and 10.0 m/s2 for the magnitude of g. -Let us say that you toss an object upwards at 5.0 from a height of 17.0 m. 1.)What is in m/s2 the acceleration of the object the moment it reaches the highest position? 2.)What is in m/s2 the acceleration of the ...
Wednesday, September 3, 2014 at 11:08pm

physics
A child, who is 45 m from the bank of a river is being carried downstream by the river's swift current of 1.0 m/s. As the child passes a lifeguard on the river's bank, the lifeguard starts swimming in a straight line until she reaches the child at a point downstream. ...
Wednesday, September 3, 2014 at 10:49pm

physics
The edges of a shoebox are measured to be 11.9 cm, 17.3 cm, and 29 cm. Determine the volume of the box retaining the proper number of significant figures in your answer.
Wednesday, September 3, 2014 at 10:41pm

physics
An automobile starts from rest and accelerates to a final velocity in two stages along a straight road. Each stage occupies the same amount of time. In stage 1, the magnitude of the car's acceleration is 3.12 m/s2. The magnitude of the car's velocity at the end of ...
Wednesday, September 3, 2014 at 10:37pm

Physics
A 49-N force is applied perpendicular to the portion BC of the bent bar. Determine the moment of P about point B and about point A. The image shows a bar that is straight from point A to B but then bends at a 42 degree angle to the left from point B to point C. The distance ...
Wednesday, September 3, 2014 at 8:44pm

AP Physics
A horse canters away from its trainer in a straight line, moving 100 m away in 19.0 s. It then turns abruptly and gallops halfway back in 5.4 s. (a) Calculate its average speed. b) Calculate its average velocity for the entire trip, using "away from the trainer" as ...
Wednesday, September 3, 2014 at 8:13pm

Physics
An open-topped tank completely filled with water has a release valve near its bottom. The valve is 1.75m below the water surface. Water is released from the valve to power a turbine, which generates electricity. The area of the top of the tank, AT, is 11.5 times the cross-...
Wednesday, September 3, 2014 at 8:01pm

AP Physics
A particle at t1 = -1.4 s is at x1 = 3.6 cm and at t2 = 4.5 s is at x2 = 8.5 cm. What is its average velocity?
Wednesday, September 3, 2014 at 7:59pm

Physics
A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6.70s later. What was the rocket's acceleration? Express your answer with the appropriate units.
Wednesday, September 3, 2014 at 7:43pm

Physics
What is the average velocity of the cart when moving from position x = 0.10 m to position x = 1.10 m? For X=0.10m on the time it took the cart to reach that position it is 0.34s The velocity of the cart at 0.10m is 0.87 For x=1.10m on the time it took the cart to reach that ...
Wednesday, September 3, 2014 at 7:39pm

Physics
A ball is thrown upwards, from a building. It's height(h), in meters above the ground seconds(t) after being thrown is given by h(t)=-5t^2+15t+50 a) How tall is the building? (explain your answer) b) How long does it take the ball to reach the ground? c) For how long is ...
Wednesday, September 3, 2014 at 7:23pm

AP Physics
If you are driving 116 km/h along a straight road and you look to the side for 1.0 s, how far do you travel during this inattentive period?
Wednesday, September 3, 2014 at 7:10pm

Physics
An airplane has an airspeed of 770 kilometers per hour at a bearing of N 48 degrees E. If the wind velocity is 28 kilometers per hour from the west, find the angle representing the bearing for the ground speed? I found Rx and Ry which are 543.23 and 572.22 respectively. To ...
Wednesday, September 3, 2014 at 6:35pm

11 Physics
my teacher gave me this question for review and i don't know how to do it!! HELP!!! A ball is thrown upwards, from a building. It's height(h), in meters above the ground seconds(t) after being thrown is given by h(t)=-5t^2+15t+50 a) How tall is the building? (explain ...
Wednesday, September 3, 2014 at 6:23pm

Physics
An object has a initial velocity of 10 m/s in the positive x direction. Under a constant acceleration it stops after undergoing a displacement of 148.3 m in the positive x direction. Because it is still under the same acceleration it then travels back in the negative in the x ...
Wednesday, September 3, 2014 at 3:52pm

Physics
An object starts from rest an undergoes a constant acceleration in the positive x direction. After some time it covers a displacement of 37 meters in the positive x direction achieving some final velocity. If the object started from rest with double the original acceleration (...
Wednesday, September 3, 2014 at 12:00pm

physics
A car drives 55 km east in a time of 1.6 hours and then drives west some distance. However, the total distance traveled for the entire trip is 338 km and the total time taken for the entire trip is 2.6 hours. What is the average speed of the second part of the trip (when ...
Wednesday, September 3, 2014 at 11:53am

physics
sledge of mass 80 kg moves over the frozen surface of a lake with a velocity of 30m/s and comes to rest in 5s. find frictional force between the lake and sledge
Wednesday, September 3, 2014 at 8:17am

Physics
1.A brass wire 80 cm long and 0.3 cm in diameter is used to hang an object weighing 6.5 x 10 ^5 dynes. Find stress, strain and young's modules. 2. To one end of a wire 1.2 m long and 0.4 cm in diameter is hung on object with a mass of 10 kg. The wire is found to be ...
Wednesday, September 3, 2014 at 7:18am

Physics
1. You are tasked to design a car park on the top floor of a condominium that can accommodate 10 cars, each car has a maximum mass of 2000 kg. The material you are using can withstand a pressure of 500 N/m^2. Calculate how large your park must be? 2. Cheryl filled a measuring ...
Wednesday, September 3, 2014 at 7:13am

Physics
1. The total length of a spring is 0.25 m. What it is unstretched and 0.30 m when a force of 17.82 N is applied to it. What will be the length when 26.72 N is applied to it? 2. A piller with a cross sectional area of 1.5 m^2 supports a portion of a building with a mass of 1.5 ...
Wednesday, September 3, 2014 at 7:02am

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