Saturday
July 2, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics M/C Quesion
Two cyclists are travelling at constant speeds around a 400 m track in opposite direction. The speed of Jeff is 1.5 times the speed of Rob. The cyclists find they meet every 20 s. What is the speed of Jeff? A) 9.0 m/s B) 12 m/s C) 13 m/s D) 20 m/s E) 30 m/s
Thursday, March 3, 2016 by the physics kid

Physics M/C Quesion
A car travelling on a straight track accelerates uniformly from rest for 5.0 s and then travels at a constant speed for the next 5.0 s, covering a total distance of 75 m in that time. Determine the constant speed that the car achieved. A) 7.5 m/s B) 10 m/s C) 15 m/s D) 20 m/s ...
Thursday, March 3, 2016 by The lost one

Physics
An Alaskan rescue plane traveling 43 m/s drops a package of emergency rations from a height of 129 m to a stranded party of explorers. The acceleration of gravity is 9.8 m/s 2 . Where does the package strike the ground relative to the point directly below where it was released...
Thursday, March 3, 2016 by Meghan

Physics
Gold-198 with a half life of 2.6 days is used to diagnose and treat liver disease. Write a half life decay equation that relates the mass of au-198 remaining to time in days. What percentage of a sample of Au-198 would reamin after 1 day, 1 week? Given the information, I could...
Thursday, March 3, 2016 by AlphaPrimes

Physics
a box of mass 7 kg is pulled up a frictionless 30 degree incline by a force of 381 N which acts parallel to the incline surface. the box has an initial speed of 5m/s and is pulled 9m. what is the speed of the box at the end of the 9m.
Thursday, March 3, 2016 by Anon

Physics
Two soccer players, Mary and Jane, begin running from nearly the same point at the same time. Mary runs in an easterly direction at 4.43 m/s, while Jane takes off in a direction 60.2o north of east at 5.07 m/s. How long is it before they are 24.7 m apart? What is the velocity ...
Thursday, March 3, 2016 by Ron

Physics
a box of mass 7 kg is pulled up a frictionless 30 degree incline by a force of 381 N which acts parallel to the incline surface. the box has an initial speed of 5m/s and is pulled 9m. what is the speed of the box at the end of the 9m.
Thursday, March 3, 2016 by S

Physics
a mass, m = 2.1 kg, is ejected horizontally from a compressed coil with a force constant, k = 5.2 N/m and compression, x = 25 cm, onto a rough ramp that is 1.5 cm long with one end raised to a height, h= 120 cm. the speed at the bottom of the rough ramp is v=+3.037 m/s. the ...
Thursday, March 3, 2016 by S

Physics
a 2199 kg pile driver is used to drive a steel beam into the ground. the pile driver falls 8.8 m before contacting the beam, and it drives the beam 19 cm into the ground before coming to rest. using energy considerations, calculate the average force the beam exerts on the pile...
Thursday, March 3, 2016 by Anonymous

Physics
Imagine a landing craft approaching the surface of Callisto, one of Jupiter's moons. If the engine provides an upward force (thrust) of 2784 N, the craft descends at constant speed; if the engine provides only 1879 N, the craft accelerates downward at 0.39 m/s2. What is ...
Thursday, March 3, 2016 by Kameron

Physics
A car traveling at 71 km/h hits a bridge abutment. A passenger in the car moves forward a distance of 63 cm (with respect to the road) while being brought to rest by an inflated air bag. What magnitude of force (assumed constant) acts on the passenger's upper torso, which...
Thursday, March 3, 2016 by Kaley

physics
A block of mass m = 5.90 kg is released from rest from point circled A and slides on the frictionless track shown in the figure below. (Assume ha = 7.30 m.) point b is 3.20 m and point c is 2.00m. (a) Determine the block's speed at points circled B and circled C. point ...
Thursday, March 3, 2016 by mark

physics
ball of mass m = 1.70 kg is released from rest at a height h = 54.0 cm above a light vertical spring of force constant k. The ball strikes the top of the spring and compresses it a distance d = 8.80 cm Neglecting any energy losses during the collision, find the following. a) ...
Thursday, March 3, 2016 by sherry

physics
An older-model car accelerates from 0 to speed v in 10. s. A newer, more powerful sports car of the same mass accelerates from 0 to 4v in the same time period. Assuming the energy coming from the engine appears only as kinetic energy of the cars, compare the power of the two ...
Thursday, March 3, 2016 by sherry

physics
An archer pulls her bowstring back 0.420 m by exerting a force that increases uniformly from zero to 240 N. (a) What is the equivalent spring constant of the bow? N/m (b) How much work does the archer do in pulling the bow? J
Thursday, March 3, 2016 by sherry

physics
A 0.290-kg block along a horizontal track has a speed of 1.30 m/s immediately before colliding with a light spring of force constant 53.4 N/m located at the end of the track. (a) What is the spring's maximum compression if the track is frictionless? m
Thursday, March 3, 2016 by sherry

Physics
A circuit consists of a 10 ohm resistor in series with 3 identical batteries each with an emf = 1.0V and internal resistance of 5 ohms. a) find potential difference between the terminals b) potential difference across the 10 ohm resistor c) power dissipated in resistor
Thursday, March 3, 2016 by Joe

PHYSICS HELP
Determine the normal force for a laundry basket with a mass of 4.5 kg in each of the following situations (a) at rest on a horizontal surface? __ n (b) at rest on a ramp inclined at 12° above the horizontal? __N (c) at rest on a ramp inclined at 25° above the ...
Thursday, March 3, 2016 by Cheyenne

Physics
An electric field with constant magnitude and direction is said to be?
Thursday, March 3, 2016 by MeritGodwin

Physics
Determine the acceleration of an electron placed in a constant downward electric field of 4.0X10^5N/C.
Thursday, March 3, 2016 by MeritGodwin

Physics
Object Y is attracted to object B. If object B is known to be positively, what can we say about object A
Thursday, March 3, 2016 by MeritGodwin

physics
An egg is thrown nearly vertically upward from a point near the cornice of a tall building. It just misses the cornice on the way down and passes a point 8.5 m below its starting point 3.0 s after it leaves the thrower’s hand. Air resistance may be ignored. (c) What is ...
Thursday, March 3, 2016 by kane

Physics
The equation of a transverse wave travelling wave on a string is: Y=3 cos[3.14(0.5x-200t)] Where x and y in cm and t is in second. a)find the amplitude, wave length,frequency period,velocity of propagation. b)if the mass per unit length of the string is 0.5 kg/m find the tension.
Thursday, March 3, 2016 by Megha

physics
A 60ft aluminum at 60 degree farenhiet to 100 degree farenhiet. Whats is the final length of the aluminum?
Thursday, March 3, 2016 by marvin

Physics 101
Two ice skaters, each with a mass of 72.0 kg, are skating at 5.10 m/s when they collide and stick together. If the angle between their initial directions was 117°, determine the components of their combined velocity after the collision. (Let the initial motion of skater 1 ...
Thursday, March 3, 2016 by Lorelei

physics
In a series L.C.circuit the inductant and capacitant are 0.5H and 20mf respectively. calculate the resonance frequency of the circuit.
Wednesday, March 2, 2016 by Blue

physics
A car moves 3 kph. Car B which is 50 m ahead of Car A is moving at 6 kph. If car A accelerates by 5m/s/s, determine if the cars will collide.
Wednesday, March 2, 2016 by Hannah

Physics
A waterfall is 1260m high. calculate the change in temperature of the quantity of water that falls from the top to the bottom of the waterfall( neglect heat losses to the surrounding) take g to be 10m/s and specific.heat capacity of water to be 4200j/kg/k.
Wednesday, March 2, 2016 by Blue

Physics
A string under a tension of 43.0 N is used to whirl a rock in a horizontal circle of radius 2.25 m at a speed of 20.0 m/s on a frictionless surface as shown in the figure below. As the string is pulled in, the speed of the rock increases. When the string on the table is 1.00 m...
Wednesday, March 2, 2016 by Jack

physics
A string under a tension of 43.0 N is used to whirl a rock in a horizontal circle of radius 2.25 m at a speed of 20.0 m/s on a frictionless surface as shown in the figure below. As the string is pulled in, the speed of the rock increases. When the string on the table is 1.00 m...
Wednesday, March 2, 2016 by Kevin

Physics
What is the velocity of the simple harmonic motion problem? Position of the graph is y= .4*cos(2pi*1/3*x)+1.2 I need to find the velocity as well as the acceleration. I have worked through it and keep getting that the velocity is 0. I don't believe that is correct.
Wednesday, March 2, 2016 by Dib

Physics
1.) jet plane traveling 1800 km/h (500 m/s) pulls out of a dive by moving in an arc of radius 6.00 km. What is the plane's acceleration in g's? 6.) A child on a merry -go-round is moving with a speed of 1.35 m/s when 1.20 m from the center of the merry-go-round. a.) ...
Wednesday, March 2, 2016 by JT

Physics
3/2/2016 An unknown substance at a temperature of 20 degrees Celsius is warmed up to 50 degrees when water at 80 degrees is added to it. The sum of the masses of the unknown substance and water is equal to 1000grams. In another experiment, the same substance at 20 degrees is ...
Wednesday, March 2, 2016 by Marilynn on behalf of Victor Hopman

Physics
A machine has an overcome of 60percent.If the machine is required to overcome a load of 30N with a force 20N.calculate it velocity ratio?
Wednesday, March 2, 2016 by Dalong

PHYSICS
Yuvi is trying out for the track & field team and wants to give long jump a try. He currently can reach a distance of 5.90 m when leaving the ground at an angle of 30.0°. (a) What is his takeoff speed? (b) If Yuvi could increase his takeoff speed 5.0%, how much further ...
Wednesday, March 2, 2016 by Rob

Physics
A hostess wants to cool her 100g of soup which is currently at 50Celsius, and it's specific heat is 0.8 cal/g celsius, by adding water (specific heat = 1 cal/ g celsius) at a temperature of 5Celsius, how much water should she add, assuming that all the heat from the soup ...
Wednesday, March 2, 2016 by Mad

physics
determine the thrust produced if 1.5 x 10^3 kg of gas exits the combustion chamber each second, with a speed of 4.00 x 10^3 m/s
Wednesday, March 2, 2016 by john

Physics
The system of nine small 3 kg objects is rotating at an angular speed of 6 rev/s. The objects are connected by light, flexible spokes that can be lengthened or shortened. What is the new angular speed if the spokes are shortened from 6 m to 2 m?
Wednesday, March 2, 2016 by Anonymous

physics
how many electrons drift past a point on for 10 minutes current is 0.2 A.the charge on one electrons 1.6*10^-1
Wednesday, March 2, 2016 by ruth

physics
A 5.3-kg block is pushed 2.3 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of θ = 30° with the horizontal, as shown in the figure below. If the coefficient of kinetic friction between block and wall is 0.30, determine ...
Wednesday, March 2, 2016 by sherry

physics
1)a galvanometer has a resistance of 40 ohm and is of 3 mA full-scale deflection.how would you modify it to act as a 0-5 A ammeter? 2)the galvanometer described in question 1 is to be converted into a 0-5 V voltmeter. a)when the voltmeter is connected to a 5 V supply ,how ...
Wednesday, March 2, 2016 by ruth

Physics
A 2.92 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 1.93 m in 1.60 s. (a) Find the magnitude of the acceleration of the block. __ m/s2 (b) Find the coefficient of kinetic friction between the block and the incline...
Wednesday, March 2, 2016 by Cheyenne

Physics
Determine the normal force for a laundry basket with a mass of 4.5 kg in each of the following situations... (a) at rest on a horizontal surface? ___ N (b) at rest on a ramp inclined at 12° above the horizontal? ___ N (c) at rest on a ramp inclined at 25° above the ...
Wednesday, March 2, 2016 by Cheyenne

Physics
Yuvi is trying out for the track & field team and wants to give long jump a try. He currently can reach a distance of 5.90 m when leaving the ground at an angle of 30.0°. (a) What is his takeoff speed? (b) If Yuvi could increase his takeoff speed 5.0%, how much further ...
Wednesday, March 2, 2016 by Rob

Physics
An ice skater of mass (on frictionless ice) fires a bullet of mass 10 grams that leaves the barrel at 500 m/s (in the x-direction relative to the ground) A) what is the recoil velocity of the skater relative to the ground? B) how much work is done in the bullet by the ...
Wednesday, March 2, 2016 by Fullmetal

physics
the current in alightning strike is 7500A.the strike lasts for 240ms.calculate a,the charge in c ,which flows in the strike to the ground b,the number of electrons transferred to the ground
Wednesday, March 2, 2016 by suzy

Physics
A 60kg man standing on a stationary 40kg boat throws a 0.2kg ball with a velocity of m/s. Assuming there is no friction between the man and the boat, what is the speed of the boat after the man throws the ball?
Wednesday, March 2, 2016 by Sami

Physics
Calculate the force required to pull a copper ball of radius 2.00 cm upward through a fluid at the constant speed 6.00 cm/s. Take the drag force to be proportional to the speed, with proportionality constant 0.950 kg/s. Ignore the buoyant force. N
Tuesday, March 1, 2016 by Kev

Physics
1. A car undergoes a displacement of 500m due east, followed by another displacement due south of 1200m. a)Calculate the total distance traversed by the car d1+d2=total distance 500+1200=1700m b) Calculate the total displacement of the car D=√(500^2+1200^2)=1300 tan^-1(...
Tuesday, March 1, 2016 by Steve

Physics
Block B in the figure weighs 739 N. The coefficient of static friction between block and table is 0.34; angle θ is 26°; assume that the cord between B and the knot is horizontal. Find the maximum weight of block A for which the system will be stationary.
Tuesday, March 1, 2016 by Daisy

physics
Boxes A and B are connected to each end of a light vertical rope. A constant upward force F = 80.0 N is applied to box A. Starting from rest, box B descends 12.0 m in 4.00 s. The tension in the rope connecting the two boxes is 36.0 N. What are the masses of (a) box B, (b) box A?
Tuesday, March 1, 2016 by Kayla

Physics
I was wondering if you could clarify this question. How much thermal energy is needed to change 100 g of ice at -20 degrees celsius into steam at 110 degrees celsius? Q = mLv (Lv = Specific latent heat of vapourization) I can't find the Lv for ice. Is this a two step ...
Tuesday, March 1, 2016 by JavaUtility

Physics
How much thermal energy is released when 500 g of steam at 100 degrees celsius condenses into liquid and then cools to 50 degrees celsius. What I`ve Attempted: Q=mLv m = 500g (0.5 kg) Lv = 2.3*10^6 Q=(0.5)(2.3*10^6) Q=1,150,000 J Q = 1.2*10^6 The answer in the back of the book...
Tuesday, March 1, 2016 by AlphaStrike

physics
Your CECS graduation tassel hangs from the rear view mirror of your graduation gift, a 1981 DeLorean DMC-12 with Mr. Fusion garbage fusion generator!!! Your tassel hangs plumb or vertical when driving at a constant speed on a level highway. When accelerating you observe the ...
Tuesday, March 1, 2016 by Jesse

Physics
What is the velocity of the simple harmonic motion problem? Position of the graph is y= .4*cos(2pi*1/3*x)+1.2 I need to find the velocity as well as the acceleration. I have worked through it and keep getting that the velocity is 0. I don't believe that is correct.
Tuesday, March 1, 2016 by Dib

physics
The figure here shows four penguins that are being playfully pulled along very slippery (frictionless) ice by a curator. The masses of three penguins and the tension in two of the cords are m1 = 12 kg, m3 = 16 kg, m4 = 21 kg, T2 = 101 N, and T4 = 202 N. Find the penguin mass ...
Tuesday, March 1, 2016 by sara

physics
You live at the top of a steep (a slope of ???? degrees above the horizontal) hill and must park your 2200 kg car on the street at night. a) You unwisely leave your car out of gear one night and your handbrake fails. Assuming no significant frictional forces are acting on the ...
Tuesday, March 1, 2016 by sabrina

physics
A 5.25-kg ball, moving to the right at a velocity of +2.10 m/s on a frictionless table, collides head-on with a stationary 7.60-kg ball. Find the final velocities of the balls if the collision meet the following conditions. (a) elastic 5.25-kg ball = Incorrect: Your answer is ...
Tuesday, March 1, 2016 by Rhea

PHYSICS
a student consumed a 0.23 kg of juice with 115 calories per 1.15 serving. How much work you must perform to remove these calories?
Tuesday, March 1, 2016 by HANNAH

physics
A mettalic sphere of radius a carries a charge Q. It is brought in contact with an uncharged sphere of radius b . what will be the charge on the first sphere. My work I eliminated 2 options by substitution and realised that it won't be their average as they don't have ...
Tuesday, March 1, 2016 by Anonymous

science (physics)
A copper wire with cross sectional area 0.00030cm^2 is to be used in lifting a 100g object.How fast can the object be accelerated if the wire is to stretch not more than 0.10%? What i know is that first find the elongation & then that will help to find acceleration..
Tuesday, March 1, 2016 by joan

physics
A 1.5 kg book is lying on a 0.70 m -high table. You pick it up and place it on a bookshelf 2.0 m above the floor. During this process, how much work does gravity do on the book? -> 1.5 * -9.8 * 1.3 = -19.1 J During this process, how much work does your hand do on the book?
Tuesday, March 1, 2016 by Anonymous

Physics
You are on vacation in San Francisco and decide to take a cable car to see the city. A 5500 kg cable car goes 360 m up a hill inclined 19 ∘ above the horizontal. What can your learn about the work done by the cable to move car up the hill? Answer quantitatively. Ignore ...
Monday, February 29, 2016 by James

Science (Physics)
Air becomes a conductor when the electric field strength exceeds 3.00 × 106 N/C. Determine the maximum amount of charge that can be carried by a metal sphere 8.5 m in radius. The value of the Coulomb constant is8.99×109 N·m2/C2. Answer in units of C. I have ...
Monday, February 29, 2016 by Lydia

physics
Question: You live at the top of a steep (a slope of ???? degrees above the horizontal) hill and must park your 2200 kg car on the street at night. a) You unwisely leave your car out of gear one night and your handbrake fails. Assuming no significant frictional forces are ...
Monday, February 29, 2016 by tom

Physics
Rosie (mass 41 kg) pushes a box with a horizontal force of 140 N (31.472 lb) at a speed 25 m/min. A. What is Rosie’s power output? Answer in units of W. B.What energy is produced by a 300 W lightbulb lit for 4.1 hours? Answer in units of J
Monday, February 29, 2016 by Sam

Physics
Zak, helping his mother rearrange the furniture in their living room, moves a 42.3 kg sofa 7.2 m with a constant force of 17 N. A. What is the work done by Zak on the sofa? Neglect friction. Answer in units of J. B. What is the average acceleration of the sofa? Answer in units...
Monday, February 29, 2016 by Sam

Physics
Block A is 4.5 kg and Block B is 2.25 kg. a. determine the mass of block C that must be placed on block A to keep it from sliding if the coefficient of static friction between block A and the table is 0.2 b. If the coefficient of kinematic friction between the surface and ...
Monday, February 29, 2016 by Diana

physics
A 5 kg block is being held against the wall. What is the minimum force needed to keep the block from moving if the force is applied at an angle that is 15 degrees above the horizontal. The coefficient of static friction between the wall and the block is 0.275.
Monday, February 29, 2016 by Jamie

Physics
Please check my answers!! 1. A 75 kg. man steps off the end of a diving board, and hits the water at 7.7 m/s. Ignoring air resistance, what was the mans PE (potential energy) right before he stepped off the diving board? I got 2223.375 Joules after Damon helped me...am I right...
Monday, February 29, 2016 by Becca

Physics
1. A box is placed on the end of a 3 meter plank. One end of the plank is gradually raised and it is observed that the box begins to slide when the board reaches an angle of 25 degrees. a. Determine how long the box will take to reach the end of the plank if the coefficient of...
Monday, February 29, 2016 by Daniel

Physics
3. A skater with an initial speed of 7.6 m/s is gliding across the ice. The coefficient of friction between the ice and the skae blades is μk=0.1. a. Find acceleration of the skater b. How foar will the skater travel before coming to rest
Monday, February 29, 2016 by Emily

Physics
Please help me with this!! I am really confused about it... 1. A 75 kg. man steps off the end of a diving board, and hits the water at 7.7 m/s. Ignoring air resistance, what was the mans PE (potential energy) right before he stepped off the diving board? *I know that the ...
Monday, February 29, 2016 by Becca

physics
calculate the electrostatic force between charges of -2.4 µC and +5.3 µC, placed 58cm apart in a vaccum.
Monday, February 29, 2016 by Jonathan

physics
An artificial Earth satellite, of mass 3.00 × 10^3 kg, has an elliptical orbit, with a mean altitude of 500 km. (a) What is its mean value of gravitational potential energy while in orbit? (b) What is its mean value of orbital kinetic energy? (c) What is its total energy...
Monday, February 29, 2016 by Jonathan

physics
a 55 kg satellite is in circular orbit earth with an orbital radius of 7.4 x 10^6 m . determine the satellite’s a)kinetic energy b)gravitational potential energy c)total energy d)binding energy
Monday, February 29, 2016 by john

physics
an object is hung from a vertical spring, extending it by 24cm.if the spring constant is 35 N/m, what is the potential energy of the stretched spring ?
Monday, February 29, 2016 by john

Physics
If it takes an object 68 seconds to make 16 rotations, what would be the period of rotation? T=16/68 Is this right?
Monday, February 29, 2016 by Leo

physics
A daredevil on a motorcycle leaves the end of a ramp with a speed of 35.5 m/s as in the figure below. If his speed is 34.0 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance. m
Monday, February 29, 2016 by sara

physics
A 61.0-kg runner has a speed of 3.20 m/s at one instant during a long-distance event. (a) What is the runner's kinetic energy at this instant? KEi = J (b) If he doubles his speed to reach the finish line, by what factor does his kinetic energy change? KEf KEi =
Monday, February 29, 2016 by sara

physics
Biophysics strikes back The Biophysics students are having their usual Saturday night biophysics party performing physics experiments at a classmate’s home. This Saturday it is in an apartment building and you notice a managemnt student (MS) passed out in the stairwell. ...
Monday, February 29, 2016 by Tom

physics
How much kinetic energy does a 0.03 kg bullet traveling at a speed of 300 m/s have?
Monday, February 29, 2016 by Anonymous

physics
A light beam in air strikes the surface of a liquid at an angle 23.6 degrees from the normal. The angle of refraction in the liquid was measured to be 15.8 degrees, calculate the index of refraction for the object? calculate the speed of light in the object?
Monday, February 29, 2016 by sam

physics
There are 1.36 kgm of air at 137.9 Kpaa stirred with internal paddles in an insulated rigid container whose volume is 0.142 m3, until the pressure becomes 689.5 Kpaa. Determine (a) the work input, (b) Δ(pV), and (c) Q. Cp=1.0062 kj/(Kgm.°K), Cv = 0.7186 kj/(Kgm.°K...
Monday, February 29, 2016 by silent

physics
While the pressure remains constant at 689.5 kpaa the volume of a system of air changes from 0.567 m3 to 0.2283 m3. Determine (a) ΔU, (b) ΔH, (c) Q, (d) ΔS. (e) If the process is nonflow and internally reversible, what is the work? Cp = 0.24Btu/(lbm.° R), Cv...
Monday, February 29, 2016 by silent

physics
In an engine, a piston oscillates with simple harmonic motion so that its position varies according to the expression x = 4.7 cos ( 4t + π/6 ) where x is in centimeters and t is in seconds. Find the period of the motion.
Sunday, February 28, 2016 by juan

physics
You throw a 0.15 kg ball straight upward from ground level with an initial speed of 15 m/s. (Yes, from ground level. This is to make the calculations easier. If it bothers you, imagine you are standing in a dugout.) Your friend throws a 0.09 kg lump of clay upward after it. ...
Sunday, February 28, 2016 by Shelby

physics
i love you
Sunday, February 28, 2016 by Anonymous

physics
An automotive suspension system consists of a combination of strings and shock absorbers, if you were an automotive engineer, would you design a suspension system that was underdamped, critically damped, or overdamped? Discuss each case.
Sunday, February 28, 2016 by Baseeruh

Physics
An electron (m = 9 x 10-31 kg) leaves the cathode of a radio tube with zero initial velocity and travels in a straight line to the anode, which is 1 cm away. It reaches the anode with a velocity of 6 x 106 m s-1. If the force on the electron was constant, calculate: the ...
Sunday, February 28, 2016 by Fleur

Physics
Four masses (2kg 3kg 1kg and 2kg) are arranged on a square of side 1.2 m. What is the moment of inertia if the axis of rotation is at the center of the square? What is the moment of inertia if you make the axis of rotation through mass 2kg (this mass cannot contribute to ...
Sunday, February 28, 2016 by Sam

Physics
A discus thrower accelerates a discus from rest to a speed of 25m/s by whirling it at 1.25 rev. The discus moves in circle of radius 1m. Find a. The final angular speed, b. The constant angular acceleration, c. The time interval from rest to the speed 25m/s. Thanks for the help!
Sunday, February 28, 2016 by Edge

physics
A car is travelling 20m/s along a straight road. The driver sees a 36km/h speed limit sign 100m ahead. What constant retardation is required to reduce the speed to 36km/h in this distance. Find also the time taken by the car to reach the speed limit region.
Sunday, February 28, 2016 by dillip

Physics
How much thermal energy is released when 500g of steam at 100° C condenses into water and cools to 50°C Givens: m=0.5 kg t = 50 c = 2.010 Qtotal = Q1 + Q2 Qtotal = QmcΔt + mLv Qtotal = (0.5kg)(2.010)(50) + (0.5)(2.3*10^6) Qtotal = 1.15 * 10^6 The book says that ...
Sunday, February 28, 2016 by AlphaStrike

physics
Ball A mass 0.5kg rolls at 3m/s into ball B which is stationary and has mass of 0.9kg if the collision brings ball A to rest what is the velocity of ball B immediately after the collision
Sunday, February 28, 2016 by favour

physics
Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3
Sunday, February 28, 2016 by chris

physics
A train begin to move with an acceleration of 2m/s0¡­5. When a man 9m away from the core of the train, the man begins to run and catches in 3 seconds. What is the acceleration of the man?
Sunday, February 28, 2016 by dillip

physics
Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3
Sunday, February 28, 2016 by chris

physics
Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3
Sunday, February 28, 2016 by chris

physics
Calculate the heat given off by the hot water. GIVEN: Original quantity of water (hot water) 50g Orig.temperature :40°C Final temperature: 9°C Final quantity of water: 264g Increase in quantity of water 214g. PLEASE KINDLY SHOW ME THE EQUATION FOR THIS THANK YOU. <3
Sunday, February 28, 2016 by chris

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