Friday

April 29, 2016
Number of results: 74,722

**High School Physics**

Paleontologists estimate that if a Tyrannosaurus rex were to trip and fall, it would have experienced a force of approximately 260,000 acting on its torso when it hit the ground. Assuming the torso has a mass of 3800 kg, find the magnitude of the torso's upward acceleration as...
*September 23, 2009 by Mia*

**Physics Please check my answers**

It's possible for a body to have both rotational and translational motion at the same time. True. << False. 2. The moment of inertia of an object would be different on the surface of the earth than on the surface of the moon. True. << False. 3. The moment of ...
*February 3, 2014 by Chelsea*

**Lakshman**

A 2M box is set on top of a 12M box. There is friction beween the masses. The 12M box is pushed against a spring. The spring is compressed a distance X by a 12 M mass. The 2M box does not slide from its position on top of the 12M mass. (the two masses are at rest in respect to...
*December 12, 2011 by Uma*

**Physics**

A high diver of mass 65.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting from rest. If her downward motion is stopped 2.30 s after her feet first touch the water, what average upward force did the water exert on her? I'm not sure how to ...
*January 29, 2012 by Emily*

**Physics**

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F = -c_1*r*v , where c_1 is a constant. At time t = 0, a small ball of mass is projected into a liquid so that it initially has a horizontal ...
*October 10, 2013 by aksh*

**Physics**

A projectile of mass 0.377 kg is shot from a cannon, at height 6.6 m, as shown in the figure, with an initial velocity vi having a horizontal component of 6.1 m/s. The projectile rises to a maximum height of y above the end of the cannon’s barrel and strikes the ground a ...
*September 23, 2014 by Bob*

**Public Speaking**

I need help writing a speech out on the following topic:Why banning the use of cell phones while driving should be mandatory nationwide. tate the general purpose, specific purpose, and central idea clearly and in the appropriate form.4. Limit your main points and supporting ...
*May 21, 2013 by Amieca*

**physicis**

suppose the dry ice block is moving to begin with and we exert a steady force,either speeding up or slowing down.how does the block behave? now suppose we make the steady force smaller and smaller.how does the dryice block behave? how will it behave when the force we are ...
*January 20, 2011 by chris*

**Science**

In the figure below, a uniform beam of weight 420 N and length 3.2 m is suspended horizontally. On the left it is hinged to a wall; on the right is it supported by a cable bolted to the wall at distance D above the beam. The least tension that will snap the cable is 1200 N. (a...
*December 13, 2008 by Phillipe*

**ap phyiscs**

A bowler throws a bowling ball of radius R=11 cm down a lane. The ball slides on the lane, with initial speed v(of the center of mass)=7 m/s and initial angular speed =0. The coefficient of kinetic friction between the ball and the lane is .25. The kinectic frictional force fk...
*February 10, 2008 by kristen*

**Physics**

Two charged particles exert an electrostatic force of 8 N on each other. What will the magnitude of the electrostatic force be if the distance between the two charges is REDUCED to one-third of the original distance? Would you just have to multiply 8 by 9?
*January 31, 2011 by Kim*

**math**

When an F14 fighter jet takes off, its wings are 110 degrees from the line of flight. To reach its maximum speed, the wings pull to a back position that cretes an angle from the line of flight that is 22 degrees less than a straight angle. Moving at 0.5 degrees per second, how...
*March 11, 2014 by Viking*

**physics**

A ball is thrown straight up into the air. At each of the following instants, is the magnitude of the ball's acceleration greater than g, equal to g, less than g, or zero? Air resistance may be neglected. A) just after leaving your hand? B) at the very top (maximum height)? C...
*September 21, 2014 by John*

**physics**

A small sphere of mass m=.0064kg and charge q1= +28.9 nC is attached to the end of a string and hangs vertically. A second charge of equal mass and charge q2= -58nC is located below the first charge by a distance d= 2.00cm. a. Find the Tension in the string b. If the string ...
*January 14, 2013 by Matt*

**Physics**

A block with mass M rests on a frictionless surface and is connected to a horizontal spring of force constant k, the other end of which is attached to a wall. A second block with mass m rests on top of the first block. The coefficient of static friction between the blocks is ...
*January 12, 2011 by Jon *

**physics**

we just did an practical on newton's second law and we just have to do a report on it.... basically there are two parts to it, first part is when the overall mass of the system remains constant and the second part is when the force remains constant. there are two parts which i...
*September 20, 2008 by WT*

**physics**

A small mass is attached to a 3.00m string and is raised at an angle of 65 degrees. What is its maximum speed? I've come to the conclusion that I'd need to how far it is to the ground to use the formula Eg = mg(delta)h however how wouldi approach doing that? After that, I ...
*January 25, 2015 by Habuta*

**physics**

A mass spectrometer is designed to separate protein fragments. The fragments are ionized by removing a single electron and then enter a 0.80 T uniform magnetic field at a speed of 2.3 * 10^5 m/s. If a fragment has a mass that is 85 times the mass of the proton, what will be ...
*October 1, 2011 by Paige*

**college math HELP!!!!!**

Sharon has a total of $190,000 to invest in three types of mutual funds: growth, balanced, and income funds. Growth funds have a rate of return of 12%/year, balanced funds have a rate of return of 10%/year, and income funds have a return of 6%/year. The growth, balanced, and ...
*February 22, 2014 by Dee*

**Physics**

Consider two toy cars. Car A starts from rest and speeds up with constant acceleration for a time delta t until it reached a speed of v and then continues to travel at this speed. At the moment car A reaches its maximum speed, car B, starting at rest from the same point that ...
*September 27, 2014 by Wes*

**physics**

super sam intends to jump off a 100 foot tower with an elastic cord tied to one ankle, ad the other end tied to the top of the tower. This cord is very light but very strong and stretches so that it can stop him without pulling his leg off. Such a cord exerts a force with the ...
*March 19, 2012 by Anonymous*

**Physics**

Hi, I have two homework problems I am having issues with. 1. Two carts of equal mass, m = 0.250 kg, are placed on a frictionless track that has a light spring of force constant k = 53.0 N/m attached to one end of it. The red cart is given an initial velocity of V = 2.55 m/s to...
*November 12, 2006 by Jennifer2008*

**Chemistry**

The voltaic cell described by the cell notation has a standard emf (electromotive force) of 0.94 V. Calculate the value (J) for the maximum electrical work that the cell can do under standard conditions. Round your answer to 3 significant figures. Pt(s) / Br-(aq) / Br2(l) // ...
*December 3, 2010 by Roger*

**physics**

A tennis ball (m 57 g) is projected vertically with an initial speed of 8.8 m/s. (a) If the ball rises to a maximum height of 3.7 m, how much kinetic energy was dissipated by the drag force of air resistance? (b) How much higher would the ball have gone in a vacuum?
*October 24, 2012 by bee-z*

**Physics....Orbiting Satellite**

A orbiting satellite stays over a certain spot on the equator of (rotating) Venus. What is the altitude of the orbit (called a "synchronous orbit")? I found the radius and mass of Venus on the google, but I don't know what I should plug in the "T" if I use the Kepler's 3rd law...
*January 15, 2007 by Jessy*

**Math ( Surveying )**

Need help with this problem! Thanks in advance. The ground clearance of an overhead electrical cable must be determined. Surveyor B is positioned directly under the cable (surveyor B can make a position check by sighting past the string of a plumb bob, held in his or her ...
*September 20, 2010 by Dale*

**physics**

A block slides down a rough plane. The plane makes an angle of 60 degrees with the horizontal, the weight of the block is 5.0N and the coefficient of kinetic (dynamic) friction between the block and the plane is 0.30. 1) determine the magnitude of the frictional force acting ...
*October 4, 2006 by blacksheep*

**calculus**

27 ft of wire is to be used to form an isosceles right triangle and a circle. Determine how much of the wire should be used for the circle if the total area enclosed is to be a minimum? Maximum?
*November 11, 2013 by Heidi*

**Math(Mechanics)**

In finding the minimum thickness for a thin-walled cylinder,should I use the tangential stress equation or the longitudinal stress equation? How about for maximum thickness?
*March 7, 2016 by Jhun*

**Physics**

A student gets a 2.9 kg mass to oscillate up and down on bottom of a light vertical spring by pulling her hand up and down on the top end of the spring. The spring is a real spring with a spring constant of 93 N/m and a damping constant of 0.7 N sec/m. (b) The student now ...
*April 13, 2010 by Jacob*

**Tech Math**

A 490 newton woman stands on a bathroom scale while riding in a elevator that is accelerating downward at 2m/sec/sec. Find her apparent weight and her apparent mass. Compare to her starting mass.
*July 19, 2012 by Jennifer*

**Calculus**

On planet Calculi, acceleration due to gravity is -20 ft/sec^2. A ball is thrown upward with an initial velocity of 40ft/sec from an initial height of 50. a) Write the equation for the height of the ball, s(t), at time t. b) Find the velocity when the ball hits the ground. c) ...
*February 19, 2015 by Anonymous*

**physics**

Mary applies a force of 71 N to push a box with an acceleration of 0.57 m/s2. When she increases the pushing force to 83 N, the box's acceleration changes to 0.86 m/s2. There is a constant friction force present between the floor and the box. a) what is the coefficient of the ...
*February 10, 2015 by Anonymous*

**Physics**

I am really confused on the steps to solve this problem. This is my first time taking physics. The much needed help, would be strongly appreciated. a) Calculate the centripetal force exerted on a vehicle of mass m = 1630 kg that is moving at a speed of 13.9 m/s around a curve ...
*October 21, 2014 by Carlos*

**physics**

Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . A block of mass 23.0 slides down a frictionless surface inclined at 35. Part A To ensure that the block does not accelerate, what is the magnitude of the smallest force that you must ...
*September 29, 2012 by sammy*

**physic**

A turnbuckle is needed to apply an 8kN force on a cable. If the efficiency of the turnbuckle is 40% and the force applied is 159.155N with a lever of 20cm in length. a) Find the mechanical advantage. b) Find the velocity ratio. c) Find the mean pitch of thread.
*April 2, 2009 by luc*

**Physics**

A 1,280-kg car pulls a 350-kg trailer. The car exerts a horizontal force of 3,600-N against the ground in order to accelerate. What force does the car exert on the trailer? Assume an effective friction coefficient of 0.15 for the trailer.
*March 18, 2015 by Breauna*

**Stba**

Two equal mass at distance r attract at force F . Now 20% mass from one sphere is transfer to the another sphere. What should the %change in the distance between them so F become same .
*November 26, 2015 by Anu*

**Physics**

Consider the 56 N weight held by two cables shown below. The left hand cable is horizontal. What is the tension in the cable slanted at an angle of 38degrees
*November 6, 2012 by Andy*

**Physics**

Assume cathy has to drag her suitcase along the floor of the airport terminal by a rope. The rope makes a 40.0 degree angle with the horizantal. The suitcase has a mass of 36.0 kg and Cathy pulls on the rope with a force of 65.0 N. a) What is the magnitude of the normal force ...
*October 18, 2010 by Lisa*

**Physics**

Assume cathy has to drag her suitcase along the floor of the airport terminal by a rope. The rope makes a 40.0 degree angle with the horizantal. The suitcase has a mass of 36.0 kg and Cathy pulls on the rope with a force of 65.0 N. a) What is the magnitude of the normal force...
*October 18, 2010 by Lisa*

**Mathematics**

A company manufactures two products X and Y by means of two processes A and B. The maximum capacity of process A is 1750 hours and of process B 4000 hours. Each unit of product X requires 3 hours in A and 2 hours in B, while each unit of product Y requires 1 hour in A and 4 in...
*August 19, 2015 by Anonymous*

**Statistics**

Use the following figure to answer questions 12-14: Figure 3b (British J Derm 2008) comes from a randomized trial of DHA versus a placebo pill for treating eczema. The figure shows boxplots of the eczema severity score, SCORAD, at baseline and week 8 for each group. SCORAD ...
*August 15, 2013 by Rupal*

**PHYSICS**

a) What is the maximum current in a 4.00 µF capacitor when it is connected across a North American electrical outlet having ΔVrms = 120 V, f = 60.0 Hz? mA (b) What is the maximum current when it is connected across a European electrical outlet having ΔVrms = 240 V ...
*November 29, 2013 by Cassandra*

**Physics please help**

The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four railway cars having a ...
*April 25, 2011 by Jess J*

**Physics**

Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is unable to catch the ball anymore since the ...
*June 17, 2013 by Abhishek Ranjan*

**physics**

Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is unable to catch the ball anymore since the ...
*June 17, 2013 by Anonymous*

**physics**

Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is unable to catch the ball anymore since the ...
*June 18, 2013 by jack *

**Math**

Suppose that y≤5x,3x≤y and 14x+15y≤1 together with 0≤x, 0≤y. The maximum value of the function y+x on the resulting region occurs at x=? and y=? The maximum value of the function is ?
*February 26, 2011 by Paul*

**Physics Urgent please help**

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F = -c_1*r*v , where c_1 is a constant. At time t = 0, a small ball of mass is projected into a liquid so that it initially has a horizontal ...
*October 13, 2013 by akha*

**Physics pls anyone can help me? its urgent**

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F = -c_1*r*v , where c_1 is a constant. At time t = 0, a small ball of mass is projected into a liquid so that it initially has a horizontal ...
*October 13, 2013 by akha*

**PHYSICS**

At an instant when a soccer ball is in contact with the foot of a player kicking it, the horizontal or x component of the ball's acceleration is 860 m/s2 and the vertical or y component of its acceleration is 1030 m/s2. The ball's mass is 0.38 kg. What is the magnitude of the ...
*September 23, 2010 by Sarah*

**PHYSICS**

At an instant when a soccer ball is in contact with the foot of a player kicking it, the horizontal or x component of the ball's acceleration is 860 m/s2 and the vertical or y component of its acceleration is 1030 m/s2. The ball's mass is 0.38 kg. What is the magnitude of the ...
*September 23, 2010 by ryan*

**physics**

At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 830 m/s2 and the vertical or y component of its acceleration is 1100 m/s2. The ball's mass is 0.37 kg. What is the magnitude of ...
*October 24, 2011 by Anonymous*

**physics**

At an instant when a soccer ball is in contact with the foot of a player kicking it, the horizontal or x component of the ball's acceleration is 780 m/s2 and the vertical or y component of its acceleration is 1160 m/s2. The ball's mass is 0.38 kg. What is the magnitude of the ...
*February 5, 2013 by Carlos*

**Physics **

At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 940 m/s2 and the vertical or y component of its acceleration is 710 m/s2. The ball's mass is 0.35 kg. What is the magnitude of the...
*February 13, 2013 by Randy*

**Physics!**

At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 860 m/s2 and the vertical or y component of its acceleration is 930 m/s2. The ball's mass is 0.38 kg. What is the magnitude of the...
*March 22, 2013 by Christina*

**Physics**

At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 750 m/s2 and the vertical or y component of its acceleration is 850 m/s2. The ball's mass is 0.39 kg. What is the magnitude of the...
*February 11, 2014 by Anonymous*

**Physics**

At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 810 m/s2 and the vertical or y component of its acceleration is 910 m/s2. The ball's mass is 0.32 kg. What is the magnitude of the...
*October 22, 2014 by Joseph*

**physics**

At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 930 m/s2 and the vertical or y component of its acceleration is 960 m/s2. The ball's mass is 0.34 kg. What is the magnitude of the...
*March 25, 2015 by Kristyn*

**physics**

A thin uniform stick having a mass of 0.680 kg and a length of 1.50 m is at rest, hanging vertically from a strong, fixed hinge at the uppermost end of the stick. The stick is free to swing back and forth in an Up-Down-East-West plane. Suddenly, the midpoint of the stick is ...
*November 30, 2012 by HALP*

**science**

a 2 kg mass accelerates at 20 m/s/s while being pushed by a 44 N force. Find the force of friction. Net force = Force pushing - Force friction. The net force here is 2 kg x 20 m/s/s.
*December 30, 2006 by leafprincess*

**Physics **

A digital voltmeter with high internal resistance gives a maximum reading of 2.0 V. It is used to determine current by measuring the potential difference across a standard resistor S through which current has passed. What should the resistance of S be to measure currents up to...
*February 4, 2016 by Priya*

**physics**

A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.8 m/s at ground level. Its engines then fire and it accelerates upward at 3.90 m/s2 until it reaches an altitude of 920 m. At that point its engines fail, and the rocket goes into ...
*October 8, 2009 by blair*

**Physics please help**

The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four railway cars having a ...
*April 20, 2011 by Jess J*

**Physics please help**

The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four railway cars having a ...
*April 25, 2011 by Jess J*

**Physics**

An advertisment claims that a certain 1200 kg car can accelerate from rest to a speed of 25 m/s in 8.0 s. what average power must the motor supply in order to cause this acceleration?
*June 13, 2011 by unknown*

**physics**

A 90g arrow is shot straight up into the air with a spped of 23 m/s. It reaches a maximum height of 25.9898m. Find the initial kinetic energy. the acceleration of gravity is 9.8 m/s2. Answer in units of J. Find the potential energy at its highest position. Answer in units of J.
*October 21, 2010 by Deb*

**physics**

friction between tires and pavement supplies the centripetal acceleration necessary for a car to turn. Using the coefficients of friction for rubber on concrete calculate the maximum speed at which a car can round a turn of radius 30 m (a) when the road is dry; (b) when the ...
*February 22, 2015 by Marley*

**Physics**

Thank you so much bobpursley for all your help. I actually think I'm beginning to understand, physics involves a lot of what I've learned so far, Newton's laws, mass, acceleration, etc... I just have to make connections. “A Honda Civic and Lincoln Town Car are initially at ...
*December 3, 2009 by Hannah*

**Physics**

Thank you so much bobpursley for all your help. I actually think I'm beginning to understand, physics involves a lot of what I've learned so far, Newton's laws, mass, acceleration, etc... I just have to make connections. “A Honda Civic and Lincoln Town Car are initially at ...
*December 3, 2009 by Hannah*

**Physics**

Thank you so much bobpursley for all your help. I actually think I'm beginning to understand, physics involves a lot of what I've learned so far, Newton's laws, mass, acceleration, etc... I just have to make connections. “A Honda Civic and Lincoln Town Car are initially at ...
*December 4, 2009 by Hannah*

**physics**

In a hydraulic piston, the small piston has a diameter of 2cm and the large piston has a diameter of 6m. How much more force can the larger piston exert compared with the force applied to the smaller piston?
*August 6, 2012 by nick*

**Chemistry**

What does it mean to say that a solution is saturated with a solute? (Select all that apply.) a) A solute that is at equilibrium with undissolved solvent. b) A solvent that is at equilibrium with solute. c) A solution contains the maximum amount of solvent possible at a ...
*May 12, 2010 by Michael*

**Composition **

When writing a paragraph there should be a topic sentence and supporting points what would be the readers reactions if there was not?
*October 6, 2010 by Anonymous*

**Physics Classical Mechanics**

A uniform stick of mass m and length l is suspended horizontally with end B at the edge of a table as shown in the diagram, and the other end A is originally held by hand. The hand at A is suddenly released. At the instant immediately after the release: (a) What is the ...
*November 7, 2013 by A*

**Physics - Rotational Motion**

A ball of mass 5.3 kg and radius 8 cm rolls without slipping horizontally at 4.3 m/s and hits a spring attached to a wall. What is the maximum change in length of the spring if the spring constant k=41100N/m? (Assume the floor is frictionless)
*November 17, 2011 by Jim*

**Physics**

Suppose you use a piece of fishing line to hang a large object from the ceiling. The line has a test strength of 125 lbs. Convert this to newtons, and determine the maximum mass that can be supported before the line breaks.
*July 19, 2012 by lynn*

**PHYSICS(HELP)**

A uniform stick of mass m and length l is suspended horizontally with end B at the edge of a table as shown in the diagram, and the other end A is originally held by hand. The hand at A is suddenly released. At the instant immediately after the release: (a) What is the ...
*November 11, 2013 by Anonymous*

**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...
*November 10, 2014 by stewart*

**science **

jason wants to know the mass of air in his soccer ball. to find the mass he should ? He should add the mass or subtract the mass of an inflated ball or empty ball ?
*April 26, 2010 by Ashley*

**Physics. Appreciate the help I can get.**

A 400.0 kg mass experiences a horizontal push force of +720 N and a friction force of 320 N. A) assuming the mass is initially moving at 5.0 m/s how far will it travel in 6.0s? B) how much work does the 720.0 Newton force do over the distance determined in part (a) C) ...
*October 20, 2015 by Jenny *

**physics**

A block of mass 3 kg initially at rest is pulled along a friction less horizontal surface with a force of 4N. The speed of the block at t=2s is a)4/3 m/s b)8/3m/s c)4 m/s d)8m/s e)24m/s For this problem this is a graph. Some of the points on the graph are (0,0),(1,2),(2,4),(3,...
*December 29, 2006 by me*

**Physics**

A 1200 kg car pulls a 510 kg trailer. The car exerts a horizontal force of 4040 N against the ground in order to accelerate. What force does the car exert on the trailer? Assume an effective friction coefficient of 0.160 for the trailer.
*October 25, 2014 by Sandy*

**Physics - Another Question**

"Two girls, one of mass 40kg and the other of mass 60kg, are standing side by side in the middle of a frozen pond. One pushes the other with a force of 360N for 0.10s. The ice is essentially frictionless. What is each girl's acceleration?"
*July 12, 2010 by Stuck*

**physics**

A block at rest. The coefficients of static and kinetic friction are .75(Static) and .64(Kinetic). The acceleration of gravity is 9.8m/s^2 and the mass is 46kg. I've solved for the frictional force which is, 252.0841609N. Though what is the largest angle which the incline can ...
*December 14, 2014 by allan*

**Physics**

A 120.0 volt motor draws a current of 7.60 A when running at normal speed. The resistance of the armature wire is 0.610. (a) Determine the back emf generated by the motor. 115.364 V (b) What is the current at the instant when the motor is just turned on and has not begun to ...
*October 9, 2007 by Mary*

**Physics**

As you lift a chair to store is upside down on a desk, gravity exerts a force, mg, downward and you exert a force of the same magnitude upwards. The two forces are equal in magnitude and opposite in direction. From this is would appear that no work was done, but you know you ...
*March 21, 2012 by Becky*

**Physics**

The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four railway cars having a ...
*April 20, 2011 by Jess J*

**Physics! Please help me!**

An oscillating block-spring system has a mechanical energy of 5.1 J, an amplitude of 0.81 m, and a maximum speed 1.6 m/s. Find the spring constant k of the spring. What is the mass of the block? What is the frequency of oscillation?
*April 24, 2013 by Chelsea*

**Physics**

A block of mass m = 2.4 kg is released from rest at a height of H = 3.0 m on a curved frictionless ramp. At the foot of the ramp is a spring whose spring constant is k = 317.0 N/m. What is the maximum compression of the spring, x?
*June 17, 2014 by Devon*

**Physic energy conservation**

A 5 kg mass attached to a spring passes its equilibrium point moving at 390 m/s. If the spring constant is 1450 N/m, what is the maximum displacement of the spring from its equilibrium position?
*October 31, 2014 by Hi*

**Chemistry **

A chemical technician prepares Ni(NH3)6Cl2 by adding 4.55 g of solid NiCl2·6H2O to 25 mL of 6.0 M aqueous NH3. What is the maximum mass of Ni(NH3)6Cl2 that will be produced? how would I do this question?
*December 14, 2015 by Dan*

**physics**

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F⃗ = −C1rv⃗ , where C1 is a constant. At time t = 0, a small ball of mass m is projected into a liquid so that it initially has...
*October 14, 2013 by Anonymous*

**PHYSICS(HELP)**

At low speeds (especially in liquids rather than gases), the drag force is proportional to the speed rather than it's square, i.e., F⃗ = −C1rv⃗ , where C1 is a constant. At time t = 0, a small ball of mass m is projected into a liquid so that it initially has...
*October 14, 2013 by Anonymous*

**Physics**

A machine swings a mass of 1kg connected to a massless rope in a vertical circle so that the speed of them mass is constant at 8 m/s. The rope is 1.0 m long, and the center of the circle is fixed at all times. a) Find the acceleration of the mass with magnitude and direction ...
*November 12, 2013 by Robin*

**Physics**

*I really don't know how to get started. I have done lots of the homework, but this one (and a couple of others) are really giving me PROBLEMS.* A stockroom worker pushes a box with a mass 10.5 kg on a horizontal surface with a constant speed of 3.00 m/s. The coeffecients of ...
*October 1, 2006 by John*

**physics**

An air puck of mass 0.33 kg is tied to a string and allowed to revolve in a circle of radius 1.12 m on a horizontal, frictionless table. The other end of the string passes through a hole in the center of the table and a mass of 1.1 kg is tied to it. The suspended mass remains ...
*December 10, 2011 by tanya*

**physics**

A baseball pitcher throws a ball with a maximum speed of 150. km/h. If the ball is thrown horizontally, how far does it fall vertically by the time it reaches the catcher's glove 20. m away? Give your answer numerically in meters using decimal notation (omit the units). Use ...
*September 19, 2009 by Michael*

**Math**

The maximum weight M that can be supported by a beam is jointly proportional to its width w and the square of its height h, and inversely proportional to its length L. a. Write an equation that expresses this prportionality b. Determine the constant of proportionality if a ...
*March 20, 2010 by Jennifer*