Friday
July 3, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
On a frictionless air hockey table, a puck of mass 5.0 kg moving at 2:0m=s approaches an identical puck that is stationary. After collision, the rst puck moves at 30 degrees above the original line of motion; the second puck moves 60 degrees below. (a) What are the ...
Tuesday, April 7, 2015 by winged17

PHYSICS
What power (in horsepower) is developed by a grinding machine whose wheel has a radius of 8.10 in and runs at 2.50 rev/s, when the tool to be sharpened is held against the wheel with a force of 43.0 lb? The coefficient of friction between the tool and the wheel is 0.340 . Help...
Monday, April 6, 2015 by Beckles

physics
An elevator and its load have a combined mass of 1962 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 7.5 m/s, is brought to rest with constant acceleration in a distance of 4.2 m.
Monday, April 6, 2015 by joe

Physics
A hard-rubber or plastic comb rubbed against wool can often be shown to have a static charge. Why does a metal comb not readily show a static charge when rubbed against wool?
Monday, April 6, 2015 by Ciara

Physics
A rescue helicopter is lifting a man (weight = 868 N) from a capsized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 1.83 m/s2? (b) What is the tension during the remainder of the rescue when ...
Monday, April 6, 2015 by Kristyn

Physics
a 12 kg physics book flies through the air with a momentum of 20kg m/s. what is its speed?
Monday, April 6, 2015 by Natalie

Physics
A 1-kg ball initially moving with a speed of 3m/s strikes a stationary 2kg ball head-on. After the collision both balls stick together. What are the final velocities of the two balls?
Monday, April 6, 2015 by Nate

physics
a skier decides to ski down a hill inclined at 12 degrees to the horizontal. He pushes on his poles and starts to slide down the slope. If his initial speed after he stops pushing is 4.7 m/s and us= 0.28, how far will mr.grewal slide down the hill before coming to rest
Monday, April 6, 2015 by Tom

Physics
an object falls from a 3m height what is the speed of the object just before it touches the ground?
Monday, April 6, 2015 by Kat

Physics
A 2.0kg object initially at rest explodes breaking into two pieces of mass 5.0kg and 15.0kg. If the 15.0kg piece moves with a speed 2m/s what is the speed of the 5.0kg piece? A. -6 m/s B. 15 m/s C. -5 m/s D. 20 m/s
Monday, April 6, 2015 by Natalie

Physics
Which of the following household electrical appliances has the greatest rate of energy consumption? ITEM VOLTAGE CURRENT A. Video Camera 6.0 V 1.6 A B. Radio 4.5 V 0. 45 A C. Cassette Recorder 6.0 V 2.2 A D. Ghetto Blaster 12 V 1. 4 A .
Monday, April 6, 2015 by sarah

physics
Consider eight two-cubic centimeter (2 cm3) sugar cubes stacked so that they form a single 2 x 2 x 2 cube. How does the surface area of the single, large cube compare to the total surface area of the individual eight cubes? Report your answer as a ratio. Be sure to show all ...
Monday, April 6, 2015 by Ciara

Physics
What is the fundamental frequency on a 5 m rope that is tied at both ends if the speed of the waves is 24 m/s?
Monday, April 6, 2015 by Ginny

Physics
Radio waves travel at the speed of light, which is 3.00 ✕ 108 m/s. What is the wavelength for a FM station broadcasting at 97.9 MHz (the prefix M is "mega" and means 106)?
Monday, April 6, 2015 by Ginny

physics
an archer shoots an arrow into a piece of wood. the arrow is traveling at 120km/h when it strikes the wood. the arrow penetrates 3.8cm into the wood before stopping. what is its average acceleration (in m/s squared) into the wood?
Monday, April 6, 2015 by tommy

physics
an 83.2 kg girl is standing on a frictionless ice surface through a 2.00 kg book at 12.6 m/s at what velocity does the girl move across the ice?
Monday, April 6, 2015 by Anonymous

Physics
Assume the muscle is 37C and is separated from the outside air by layers of fat and skin. The layer of fat, at a particular location on the skin, is 2 mm thick and has a conductivity of 0.53 W/mK. Finally, the outermost epidermal layer is 0.1 mm thick with a thermal ...
Monday, April 6, 2015 by carolyn

Physics
You hold a hose 45 degrees to the horizontal and at a height of 1 m from the floor. The water reaches a maximum distance of 10 m from where you are standing. Now you place your thumb over the end of the hose to occlude the opening by 80%, which in turn reduces the flow rate by...
Monday, April 6, 2015 by carolyn

physics
1. An electric pump, used to obtain water from 20 metres below the ground, is marked 5000W. a) If the pump operates as rated, how much energy is used to pump water every second? b) Describe the energy conversions that take place when the pump is used. c) What is the maximum ...
Monday, April 6, 2015 by Bafana

physics
1. An electric pump, used to obtain water from 20 metres below the ground, is marked 5000W. a) If the pump operates as rated, how much energy is used to pump water every second? b) Describe the energy conversions that take place when the pump is used. c) What is the maximum ...
Monday, April 6, 2015 by Jeffrey

physics
When using a double slit with light of wavelength 504 nm, it is observed that the 4-th order maximum of the interference pattern occurs at the positions of the first minimum in the diffraction pattern. If the width of the slits is 0.24 mm, what is in mm the separation of the ...
Monday, April 6, 2015 by Emily

Physics
The university skydiving club has asked you to plan a stunt for an air show. In this stunt, two skydivers will step out of opposite sides of a stationary hot air balloon 2,500m above the ground. the second skydiver will leave the ballon 20 seconds after the first skydiver but ...
Monday, April 6, 2015 by Jaime

physics
An observer can describe the motion of an object as "translational" if
Monday, April 6, 2015 by wolf

Physics
Two disks are originally separated. The mass of Disk #1 is 1.5 kg, and the mass of disk #2 is 2.6 kg. Disk #1 has a radius of 10 cm, and it is rotating at an angular velocity of 15.0 rad/sec. Disk #2 has a radius of 15 cm, and it rotates in the opposite direction at an angular...
Monday, April 6, 2015 by jeff

physics
2. On the spin cycle on a washing machine, the drum holding the clothes goes from zero to 180 rpm (revolutions per minute) in 8.0 seconds. (Hint: Be sure to change rpm to radians/sec.) (a) What is the angular acceleration (in radians/sec2) during this time period? (b) How many...
Monday, April 6, 2015 by jeff

Physics
1. A point on the edge of a large wheel of radius 0.45 meters moves through an angle of 170o at a constant angular velocity of 0.25 radians/sec. . (a) Find the length (in meters) of the arc described by the point. (b) Find the linear velocity (in m/sec) of a point located on ...
Monday, April 6, 2015 by ryan

physics
calculate the force of gravity between a newborn baby of mass 2.9kg and the obstertrician of mass 100kg, who is 0.48m from the baby.
Monday, April 6, 2015 by elon coleman

physics
A girl of mass 50kg runs up a flight of stairs.After 10 minutes she is 250 metres above the ground. Determine her average power output. Ignore the effects of friction.
Monday, April 6, 2015 by Bafana

physics
a soccer player kicks the ball of mass 0.4kg.the ball moves off at a speed of 4m/s. calculate the maximum height the ball could reach
Monday, April 6, 2015 by marta

Physics
A string is stretched by 2cm and its potential energy is u .if it is strechted by 10 cm,the potential energy is: A.u\5 B.5u C.10u D.25u
Monday, April 6, 2015 by Damandip

Physics
A string is stretched by 2cm and its potential energy is u .if it is strechted by 10 cm,the potential energy is: A.u\5 B.5u C.10u D.25u
Monday, April 6, 2015 by Damandip

physics
A car speeds up uniformly from rest so that it has a velocity of 30ms -1 after 20 second.How far does the car travel in first 10 seconds?
Monday, April 6, 2015 by Michelle

physics
A car speeds up uniformly from rest so that it has velocity of 30 ms-1 after 20 seconds. Question/ How far does the car travel in first 10 seconds?
Monday, April 6, 2015 by Michelle

physics
A car speeds up uniformly from rest so that it has a velocity of 30 ms-1 after 20 second. How far does the car travel in first 10 second?
Monday, April 6, 2015 by Michelle

Physics
Could someone show me how to work this? It's for a study guide I'm practicing, and I just can't seem to get the correct answer. The position of a 0.63 kg object attached to a spring is described by [x = (1.09 m) cos(3.11πt)] a) Find the object’s position ...
Monday, April 6, 2015 by James

Physics Fluids
Water is flowing through a rectangular channel that is 12 m wide with a speed of 0.75 m/s. The water then flows into four identical rectangular channels that have a width of 3.0 m. The depth of the water does not change as it flows into the four channels. What is the speed of ...
Monday, April 6, 2015 by Drew

Physics Fluids
When a block of volume 1.00 × 10–3 m3 is hung from a spring scale, the scale reads 10.0 N. When the same block is then placed in an unknown liquid, it floats with 2/3 of its volume submerged. The density of water is 1.00 × 103 kg/m^3. Determine the density of ...
Monday, April 6, 2015 by Drew

Physics Fluids
A column of oil of height 70.0 cm supports a column of an unknown liquid. Assume that both liquids are at rest and that the density of the oil is 840 kg/m^3. Determine the density of the unknown liquid.
Monday, April 6, 2015 by Drew

physics
an Atwood machine with two masses 6kg and 10kg. What is the tension in the chord connecting the masses. Assume the pulley is frictionless and the rope massless. Take g=9.8m/s2
Monday, April 6, 2015 by wolf

physics
A vehicle expends an energy of 25000J while moving at a constant speed of 5 ms.what is the mass of vehicle?
Monday, April 6, 2015 by nitya

physics
Why the blood pressre in human greater at the feet than in the brain?
Monday, April 6, 2015 by edward

Physics
On March 15, 2015 we observed the explosion of a star in our galaxy that is 250ly away. On what date did this explosion actually happen?
Monday, April 6, 2015 by Linda

Physics
The university skydiving club has asked you to plan a stunt for an air show. In this stunt, two skydivers will step out of opposite sides of a stationary hot air balloon 2,500m above the ground. the second skydiver will leave the ballon 20 seconds after the first skydiver but ...
Sunday, April 5, 2015 by Tony

Physics
1. A cannon ball M = 10.0kg with V = 2.4×102m/s is broken into 2 parts, if m1 = 6.4kg with angle 37° and m2 with 53°, what is the magnitude of v1 and v2?
Sunday, April 5, 2015 by natalia

physics
A 912 kg drag race car accelerates from rest to 108 km/h in 0.795 s. What change in momentum does the force produce?
Sunday, April 5, 2015 by Anonymous

physics
A falling 50-kg skydiver experiences an upward acceleration of 6.2 m/s2 when she opens her parachute. Show (by calculation) how much drag force is produced by the parachute. (50*10)=500N (10+6.2)=16.2m/sec^2 force = (ma)=50*16.2=810N
Sunday, April 5, 2015 by Ciara

physics
The sun’s mass is about 2.7 x 107 times greater than the moon’s mass. The sun is about 400 times farther from Earth than the moon. How does the gravitational force exerted on Earth by the sun compare with the gravitational force exerted on Earth by the moon? Amoon = ...
Sunday, April 5, 2015 by Ciara

physics
A 2.0-gram bullet is shot into a tree stump. It enters at a speed of 3.00 x 104 cm/s and comes to rest after having penetrated 0.05 m in to the stump. What was the average force during the impact? Show all calculations leading to an answer. KE 1= 1/2*0.002kg*300^2m/s=30 j KE2=...
Sunday, April 5, 2015 by Ciara

physics
If a stationary cart is struck head-on by a cart with twice mass of the stationary one and a velocity of 5 m/s, what will be the new velocity of the stationary cart if the collision is inelastic? Show all calculations leading to an answer.
Sunday, April 5, 2015 by Ciara

physics
At a particular point, a satellite in an elliptical orbit has a gravitational potential energy of 7000 MJ with respect to Earth’s surface and a kinetic energy of 4000 MJ. At another point in its orbit, the satellite’s potential energy is 2000 MJ. What is its kinetic ...
Sunday, April 5, 2015 by Ciara

Physics
A parachutist drops out of a plane at an altitude of 150m and accidentally drops his camera. If the parachute opens the instant he drops out of the plane and he descents at a constant speed of 6 m/s, how much time separates the arrival of the camera on the ground from the ...
Sunday, April 5, 2015 by Anna

PHYSICS
A net force of 47.0 N acts on a 53.0 kg body initially at rest. Compute the work (in joules) done by the force in the first second of time. Not sure where to start at all :(
Sunday, April 5, 2015 by Beckles

physics
Leon’s bicycle wheels have a circumference of 2 m. What is his linear speed when the wheels rotate at 1 revolution per second? Show all work leading to your answer. The wheel doesn't slip on the ground so the ground goes by at the same rate that a point on the rim of ...
Sunday, April 5, 2015 by Ciara

Physics
If a freely falling rock were equipped with a speedometer, by how much would its speed readings increase with each second IF it were on a planet where g = 20 m/s2? Show all work leading to your answer. g=20 m/s^2 20 m/s V=gt S=g( T ^2) / 2 Is this right ?
Sunday, April 5, 2015 by Ciara

Physics
If a person weighs 500 N on Earth, what would she weigh on Jupiter, where the acceleration due to gravity is 26 m/s2? Show all work leading to your answer.
Sunday, April 5, 2015 by Ciara

PHYSICS HELP PLEASE!!
A tangential force acts on the rim of a 2.0 kilogram disk-shaped wheel (0.50 m radius) and gives the wheel an angular acceleration of 4.8 rad/s^2. Neglect friction and find the magnitude of the force
Sunday, April 5, 2015 by Chris

physics
You are riding your bike and the tire has a radius of 0.33 m and mass 1.5 kg rotating at 98.7 rad/s. You just notice you are just seconds to riding off a cliff what torque will you need to stop the tire in 2.0 s before you find yourself at the bottom of a 1000 m cliff. New ...
Sunday, April 5, 2015 by Anonymous

PHYSICS HELP!!
An object is launched from the ground into the air at an angle of 38.0 o (above the horizon) towards a vertical brick wall that is 15.0 m horizontally from the launch point. If the ball takes 1.30 seconds to collide with the wall, with what speed was the ball launched?
Sunday, April 5, 2015 by baz

PHYSICS!!!!!
A 950-kg car is initially travelling at 60 km/hr. If the speed increases so that its kinetic energy increases by 165 kJ, determine the final speed of the car.
Sunday, April 5, 2015 by baz

Physics
A tangential force acts on the rim of a 2.0 kilogram disk-shaped wheel (0.50 m radius) and gives the wheel an angular acceleration of 4.8 rad/s^2. Neglect friction and find the magnitude of the force
Saturday, April 4, 2015 by Chris

Physics
A spring with a spring constant of 531 N/m is used to propel a 0.363-kg mass up an inclined plane. The spring is compressed 37.7 cm from its equilibrium position and launches the mass from rest across a horizontal surface and onto the plane. The plane has a length of 4.00 m ...
Saturday, April 4, 2015 by Demi

physics
two point charge q1=50c , q2=10c are lactated at (-1,1,-3)m, and (3,1,0)m, respectivly. Find the force on q1.?
Saturday, April 4, 2015 by dlawer

Physics
How far does water travel if you restrict the hose opening by 80%
Saturday, April 4, 2015 by Carolyn

Physics
The current flowing in a solenoid that is 20.9 cm long and has a radius of 2.40 cm and 552 turns decreases from 3.51 A to 1.03 A in 0.250 s. Determine the magnitude of the induced electric field inside the solenoid 1.20 cm from its center.
Saturday, April 4, 2015 by Kayla

Physics
A tangential force acts on the rim of a 2.0 kilogram disk-shaped wheel (0.50 m radius) and gives the wheel an angular acceleration of 4.8 rad/s^2. Neglect friction and find the magnitude of the force.
Saturday, April 4, 2015 by Xavier

Physics
A constant retarding torque of 12 N*m stops a rolling 0.80 m diameter wheel in a distance of 15 m. How much work does the torque do?
Saturday, April 4, 2015 by Alan

physics
You hold a hose 45 degrees to the horizontal and at a height of 1 m from the floor. The water reaches a maximum distance of 10 m from where you are standing. Now you place your thumb over the end of the hose to occlude the opening by 80%, which in turn reduces the flow rate by...
Saturday, April 4, 2015 by carolyn

physics
Assume the muscle is 37C and is separated from the outside air by layers of fat and skin. The layer of fat, at a particular location on the skin, is 2 mm thick and has a conductivity of 0.53 W/mK. Finally, the outermost epidermal layer is 0.1 mm thick with a thermal ...
Saturday, April 4, 2015 by carolyn

Physics
Suppose we had a straight tunnel, through Earth's center, to a point on the opposite side of the planet, and used it to deliver mail to the other side. With what speed would our packages pass through Earth's center. So: ag = (GM)/R2 Mins = (4/3)πR3*ρ So, I&#...
Saturday, April 4, 2015 by Nora

physics
The man fires an 75g arrow so that it is moving at 80 m/s when it hits and embeds in a 13kg block resting on ice. What is the velocity of the block and arrow just after the collision? How far will the block slide on the ice before stopping? A 7.2N friction force opposes its ...
Saturday, April 4, 2015 by Katie

Physics
What is the ratio of the wight of a man when he is in a tunnel 1000 km below the surface of the Earth to his weight at the surface? ...I'm not sure how to proceed, not because I don't know how to do it, but because I have no idea how to come up with a(g) 1000 km inside...
Saturday, April 4, 2015 by Nora

Physics
At the State Fair you see people trying to win a prize at a game booth. They are sliding a metal disk shaped like a puck up a wooden ramp so that it stops in a marked zone near the top of the ramp before sliding back down. You estimate that you can slide the 'puck' at ...
Friday, April 3, 2015 by jake

Physics
A stretched wire resonates in one loop. The midpoint of the wire oscillates with an amplitude of A. What is the traveled distance of the midpoint in one period? Please help me understand this relationship. Thank you very much!
Friday, April 3, 2015 by Help2

physics
A person needing help in planning a retirement program, setting aside educational funds, and deciding where and how much to invest could go to a: A. financial product company. B. financial planning firm. C. bank. D. All of the above organizations provide these services. D
Friday, April 3, 2015 by Ciaria

physics
Money managers: A. help people set up budgets to control personal spending. B. typically work for investment banks. C. are on the “sell side” of Wall Street. D. are on the “buy side” of Wall Street. B?
Friday, April 3, 2015 by Ciaria

Physics
All of the following are advantages of using the services of an investment company except: A. professional management. B. diversification. C. ease in selling shares. D. insurance protection against loss of principal. D?
Friday, April 3, 2015 by Ciaria

Physics
A disk starts at rest and accelerates with a constant angular acceleration α. After the disk completes one complete revolution, what is its angular velocity? ang.acc. = (ang.v. squared) / angle w = sqrt(angle x ang.acc.) = sqrt (2pi x ang.acc) However, the test shows that...
Friday, April 3, 2015 by Liina

PHYSICS
An object of mass M is divided into two parts ,which are placed at distance d.if gravitational force of attraction is maximum between parts,then find the ratio of mass of both parts
Friday, April 3, 2015 by Tanya

Physics
Hi, I've been stuck on this for days! I'd love if I can get some help. Two unfortunate climbers, roped together, are sliding freely down an icy mountainside. The upper climber (mass 80kg ) is on a slope at 16∘ to the horizontal, but the lower climber (mass 65kg...
Friday, April 3, 2015 by Tommy

physics
An undersea research chamber is spherical with an external diameter of 5.30m . The mass of the chamber, when occupied, is 78500kg . It is anchored to the sea bottom by a cable. The density of seawater is 1025 kg/m3. a) What is the buoyant force on the ...
Friday, April 3, 2015 by hadiatou

PHYSICS
A slab of wood with mass m = 1.7 kg floats 78% submerged.The density of water is 1000 kg/m3 . What is the density of the wood?
Friday, April 3, 2015 by MONSOFT

PHYSICS
A solid ball with a mass m = 0.53 kg floats in a tank of water. The ball is made of material with a density of 400 kg/m3 . The density of water is 1000 kg/m3 . What fraction of the volume of the ball is below the waterline?
Friday, April 3, 2015 by MONSOFT

physics
A projectile is given an initial velocity of (i + 2j) m/s, where i is along the ground and j is along the vertical. If g = 10 m/s2, the equation of its trajectory is:
Friday, April 3, 2015 by sai bhargav

physics
Taylor is interested in archery. She draws her bow and shoots an arrow at angle of 50°. It goes a distance of 100 meters. At what other angle could Taylor shoot an arrow with the same amount of force and have it go the same distance?
Thursday, April 2, 2015 by Cynethia

physics
A car traveling 30 k/h suddenly speeds up to 60k/h.What can you conclude from this information? (A) There was a change in the potential energy of the car. (B) No work ( in its scientific meaning) was done on the car. (C)The car will take four times longer to come to a complete...
Thursday, April 2, 2015 by Cynethia

physics
Rachel's crew is finally successful in shooting the firework. They shoot it to its maximum height in 7 seconds and it explodes sending fragments scattering in horizontal directions all around at a speed of 20 meters per second. In answering the questions below, assume that...
Thursday, April 2, 2015 by Cynethia

physics
Alex works at a legal firm which produces a lot of documents. Often Alex has to carry heavy stacks of documents from one office to another. On this particular day Alex, who weighs 75 kilograms, has to transport a stack of documents which weighs10 kilograms. He has to lift them...
Thursday, April 2, 2015 by Cynethia

physics
Alice is trying to open a jar of pickles. Trying as hard as she can, the top to the jar will not turn. According to the scientific definition, is Alice doing work? What has to happen for Alice to be doing work?
Thursday, April 2, 2015 by Cynethia

Physics
a 475 kg pre-stressed concrete beam is to be raised 10.0 m in 24.0 s. how many kw of power is needed to for the job
Thursday, April 2, 2015 by Don

Physics. URGENT Help Please
What is the separation of colors in a rainbow produced by? (Points : 1) different diffraction for different wavelengths different interference for different wavelengths <--- different refraction for different wavelengths difference in total internal reflection for ...
Thursday, April 2, 2015 by Taylor

physics
60 cubic feet of air at 30 PSIG and 50 degrees F is compressed to 80 PSIG and 110 degrees F. What is the final volume?
Thursday, April 2, 2015 by emma

physics
Boxes are moved on a conveyor belt from where they are filled to the packing station 12.0 m away. The belt is initially stationary and must finish with zero speed. The most rapid transit is accomplished if the belt accelerates for half the distance, then decelerates for the ...
Thursday, April 2, 2015 by shannon

physics
A 2kg block situated on a rough incline is connected to a spring of negligible mass having a spring costant of 100N/m.the pulley is frictionless.the block is released from rest when the spring is unstretched.the block moves 20 cm down the incline before coming to rest. a.find ...
Thursday, April 2, 2015 by virginia

Physics
In a straight line motion the distance travelled is proportional to the square root of Time taken. The acceleration of a particle is proportional to:-(i)√v(ii) v^2(iii)velocity (iv)v^3.Why?
Thursday, April 2, 2015 by Diksha

Physics
The position of a body moving along x-axis at Time t is given by x=(t^2-4t+6)m. The distance travelled by body in time interval t=0 to t=3s.
Thursday, April 2, 2015 by Diksha

Physics
determine the mass of ice that will be melting when 1.3g of steam at 102 ° C is passed into a calorimeter containing 80g of ice at 0 ° C
Thursday, April 2, 2015 by Ansari Ahmed

physics
Calculate the coefficient of kinetic friction for tyre rubber on the road surface.
Thursday, April 2, 2015 by patrick

physics
(b) A boy wishes to walk on ice block at a constant speed. The coefficient of sliding friction for steel on ice is 0.05 and the boy weighs 150 N. Find the force required to keep the boy moving at a constant speed along the ice.
Thursday, April 2, 2015 by tiisla

Physics
How are lights in schools usually wired... Series or parallel circuits?
Thursday, April 2, 2015 by Anonymous

Physics 101
A 25 kg box rests on an inclined plane which is 30o to the horizontal. The coefficient of sliding friction between the box and the plane is 0.30. Determine the acceleration of the box down the plane. (9.8 m/s2)
Thursday, April 2, 2015 by Roman

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