Friday
July 1, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
A small metal ball with a mass of m = 78.9 g is attached to a string of length l = 1.76 m. It is held at an angle of = 44.5° with respect to the vertical. The ball is then released. When the rope is vertical, the ball collides head-on and perfectly elastically with an ...
Tuesday, May 3, 2016 by Kevin

Physics
The target box is 2.44 m horizontally from the edge of the table. Bobby compresses the spring 1.42 cm, but the center of the marble falls 84.0 cm short of the center of the box. How far should Rhoda compress the spring to score a direct hit?
Tuesday, May 3, 2016 by Kevin

Physics
The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is __________ s. (Record your answer to the correct number of significant digits)
Tuesday, May 3, 2016 by Hanny

Physics 2
A particle at the Large Hadron collider in CERN is moving at 0.99 c as it emerges from a collision event. A) If these particles live 2.0 microseconds on average when they are at rest, how long would you expect this particle to last in the reference frame of the physicist ...
Tuesday, May 3, 2016 by Lexa

Physics
Laser light of wavelength 550 nm falls upon a diffraction grating. The slits are 25 micrometers apart and each have a width of 2 micrometers. There is a screen 2 meters away from the diffraction grating, parallel to the grating. A) At what angle does the m = 1 intensity peak ...
Tuesday, May 3, 2016 by Lexa

Physics
What is the mass of water in a closed room 5.2m x 6.3m x 2.5m when the temperature is 24 degrees celsius and the relative humidity is 65%?
Tuesday, May 3, 2016 by Antonia

plz help physics
A proton is moving in vacuum along a straight path from A to B .It passes point A at the speed of 2000km/s. a)Calculate in J and in eV the kinetic energy of the proton at A. b)Calculate the value of the positive voltage U that should be applied between A and B so that the ...
Tuesday, May 3, 2016 by vicky

Physics
What is the final speed of an object and how far does it travel while accclerating if its initial speed is 10m/s and it accelerates at 8.9m/s squared for 5 s
Tuesday, May 3, 2016 by Allen

physics
A 10 kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 100 N parallel to the incline, which makes an angle of 20 degrees with the horizontal. If the coefficient of kinetic friction is .40 and the crate is pulled a distance of 5 m, (a...
Tuesday, May 3, 2016 by wency siatula

Physics
A stone is dropped into a bore well 490m deep.after how time,the sound of splash of will be heard
Tuesday, May 3, 2016 by Plz help.me

Physics
A stone is dropped into a bore well 490m deep.after how time,the sound of splash of will be heard
Tuesday, May 3, 2016 by Praneeth

Physics
The part of an iceberg that extends above the water for ice density of 0.9g/cm3 and salted water of 1.1 g/cm3 is
Monday, May 2, 2016 by JuliePham

Physics
an artist designs a mobile of light horizontal rods connected by vertical strings and supporting various shaped weights. Find the magnitudes w2, w3, and w4 if w1= 1.00 unit of weight. The numerical values given in the figure all have units of length.
Monday, May 2, 2016 by Jessica

Physics
If a force of 10 N is required to keep a piece of wood 1m under water (density=1g/cm3 ), the force needed to keep it at 2 m under water is:
Monday, May 2, 2016 by JuliePham

Physics
A horizontal pipe has a part with a diameter 1/3 of the rest of the pipe. If v is the speed of the fluid in the wider section, then the speed in the narrower section is:
Monday, May 2, 2016 by JuliePham

Physics
A swimmer dives off a block into the water. The block is 31 inches above the surface of the water. Using projectile motion, what angle did they dive to reach point A on the surface of the water? I don't know what the variables stand for in this problem. Xf = Xi + Vixt + 1...
Monday, May 2, 2016 by Samantha

Physics
A fighter jet is traveling at 200 m/s following the arc of a vertical circle of radius R. At the top of its path, the pilot experiences “weightlessness.” What is the value of R?
Monday, May 2, 2016 by Kevin

Physics
A mercury in glass thermometer reads 4cm at ice point and 29cm at steam point. Calculate the temperature when the mercury level is at 9cm
Monday, May 2, 2016 by Temitope

physics
What quantity of energy is represented by 250cm^3 of a gas 100N.m^2 when the temperature is kept constant
Monday, May 2, 2016 by thandile

Physics
A block of mass m=25 kg is hung by a massless rope of length L=1.90 m from the ceiling of an elevator. The elevator has a downward acceleration of a=2.20 m/s^2. When the pendulum is set in a small amplitude oscillation, the period T of the pendulum is: A) 2.50s B) 3.14s C) 1....
Monday, May 2, 2016 by Maddie

physics
to go from town a to b a plane must fly about 1780km at an angle 30° west of north . how far north of A is B ?
Monday, May 2, 2016 by Anonymous

Physics
A 1.8 kg piece of a metal initially at a temperature of 180oC is dropped into the water with mass of 14 kg. The water is in a container made of the same metal with mass 3.6 kg. The initial temperature of the water and container is 16.0oC, and the final temperature of the ...
Sunday, May 1, 2016 by Anonymous

Physics
If an electron has a total energy of 5.6 MeV, how would I find the kinetic energy and momentum??
Sunday, May 1, 2016 by Sam

Physics
A 100 kg block is hanging from a frictionless pulley with another block of unknown mass on the other side of the pulley. It is released from a height of 1 meter above the ground. It then takes 0.9 seconds to reach the ground. What is the weight of the other mass? Thanks for ...
Sunday, May 1, 2016 by Alex

Physics
When a charged particle moves at an angle of 17.0o with respect to a magnetic field, it experiences a magnetic force of magnitude F. At what angle (less than 90o) with respect to this field will this particle, moving at the same speed, experience a magnetic force of magnitude 2F?
Sunday, May 1, 2016 by Lily

Physics
A ball of mass m1=3kg moving south at 6m/s collides with a ball of mass m2=2kg initially at rest. The incoming ball is deflected in the direction 60 degrees S of W and the target ball moves off at 25 degrees E of S. Consider that the Collison happens on a horizontal plane and ...
Sunday, May 1, 2016 by Simon

Physics
A 100 kg block is hanging from a frictionless pulley with another block of unknown mass on the other side of the pulley. It is released from a height of 1 meter above the ground. It then takes 0.9 seconds to reach the ground. What is the weight of the other mass?
Sunday, May 1, 2016 by Alex

Physics
An engine works between the two temperatures 200 C and 120 C. Calculate its efficiency in percentage?
Sunday, May 1, 2016 by Anonymous

physics
A rifle of mass 3.0 kg fires a 15 gram bullet with a muzzle speed of 1.5 km/s. The initial speed of the rifle’s recoil would be ?
Sunday, May 1, 2016 by Eason

physics
How much work is required to push a crate at constant velocity with a force of 185 N across a floor a distance of 8 m? J How many calories of thermal energy are produced by the friction? cal
Saturday, April 30, 2016 by Kim

Physics
Three objects are connceted by a massless wires over a frictionless pulley. The right side of the pulley wire is connected to a 15kg block and right below that is a 10kg block on the bottom of the wire. The tension in the wire connecting the 10kg and 15kg objects is measured ...
Saturday, April 30, 2016 by Alex

Physics
A 100 kg block is hanging from a frictionless pulley with another block of unknown mass on the other side of the pulley. It is released from a height of 1 meter above the ground. It then takes 0.9 seconds to reach the ground. What is the weight of the other mass?
Saturday, April 30, 2016 by Alex

Physics
A 50 Kg box rests on a horizontal surface. The coefficient of Static friction between the box and surface is 0.30. The coeffient of Kinetic friction is 0.20. What is the frictional force on the box if a 140 N horizontal push is applied to it. If a 175 N horizontal push is ...
Saturday, April 30, 2016 by Alex

physics
force has the dependence Fx = -ax4 on the position x, with the constant a = 25.0 N/m4. The work performed by this force when the position of its point of application changes from 0.75 m to 1.25 m is
Saturday, April 30, 2016 by madhu

physics only solve now
the greatest and least resultant of vectors are 21 N and 7 N respectively.find the two vectors
Saturday, April 30, 2016 by debashish

Physics
Six charge equal to Q are placed at the corners of regular hexagon of each side x,what is the electric potential at the intersection of the diagonals?
Saturday, April 30, 2016 by Ankit

physics
a) Two 36 g ice cubes are dropped into 300 g of water in a thermally insulated container. If the water is initially at 19°C, and the ice comes directly from a freezer at -19°C, what is the final temperature at thermal equilibrium? (b) What is the final temperature if ...
Friday, April 29, 2016 by ChrismB

physics
A sled is moving at a constant speed down a surface inclined at 45.0° with the horizontal and travels 30 meters in 4 seconds. Calculate the vertical velocity of the sled at the end of 4 seconds.
Friday, April 29, 2016 by Anonymous

physics
A sled is moving at a constant speed down a surface inclined at 45.0° with the horizontal and travels 30 meters in 4 seconds. Calculate the vertical velocity of the sled at the end of 4 seconds.
Friday, April 29, 2016 by Anonymous

Physics
A hypodermic syringe contains a medicine with the density of water (figure below). The barrel of the syringe has a cross-sectional area of 2.33 10-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00 atm. A force vector F of magnitude 1.99 N is ...
Friday, April 29, 2016 by Trish

Physics
A person is driving on a level road and see's a sign 180m ahead in the middle of the road. The person strikes the sign at a speed of 60km/h. If the person was travelling at 90km/h when the sign was first spotted what was the students perception-reaction time? How far back ...
Friday, April 29, 2016 by momo

physics
a ray enter from denser medium in to air. if angel incident is30 degree and angel of reflection in air 60 degree.find out refractive index of medium ?
Friday, April 29, 2016 by hina hina

physics
What mass of steam at 100¡ãC must be mixed with 388 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 45.0¡ãC? The specific heat of water is 4186 J/kg¡¤K. The latent heat of fusion is 333 kJ/kg...
Friday, April 29, 2016 by jes

Physics
A dam 143 m above a hydroelectric generator holds 1.6 x 1015 L of water. If the generator is taken to be at a height of 0 m, how much potential energy is stored in the dam?
Friday, April 29, 2016 by Megan

Physics
A dense plastic toy of mass 2.8 kg is floating just beneath the surface of a pond. What is the buoyant force on it? Answer in units of N.
Thursday, April 28, 2016 by Kitty

physics
Consider a star with a mass of 8.7 x 1031 kg. Determine the radius of the star if a typical star has a density of 1400 kg/m3.
Thursday, April 28, 2016 by Abby

Physics
NASA wants to build a centrifuge to train its astronauts to handle the strong accelerations they will experience when the space shuttle lifts off. A composite material capable of withstanding a normal force of 120000N without rupturing is used to manufacture the base of the ...
Thursday, April 28, 2016 by Kid

Physics
An 11.98-gram sample of zinc metal is placed in a hot water bath and warmed to 78.4°C. It is then removed and placed into a Styrofoam cup containing 50.0 mL of room temperature water (T=27.0°C; density = 1.00 g/mL). The water warms to a temperature of 28.1°C. ...
Thursday, April 28, 2016 by Jen

Physics
A machine gun fires 10 rounds per second. The speed of the bullets is 300m/s. 9.What is the distance in the air between the flying bullets?
Thursday, April 28, 2016 by Mero

Physics help Rolling Motion!!
A spherically symmetric object with radius R= 0.51m and mass of M= 3.5kg rolls without slipping accross a horizontal surface with velocity of V = 4.4m/s. It then rolls up an incline with an angle of 30 degrees and comes to rest a distance d = 2.2m up the incline, before ...
Thursday, April 28, 2016 by Samantha

physics
A Boeing 747 “Jumbo Jet” has a length of 59.7 m. The runway on which the plane lands intersects another runway. The width of the inter- section is 25.0 m. The plane decelerates through the intersection at a rate of 6.1 m/s2 and clears it with a final speed of 45.0 m/...
Thursday, April 28, 2016 by Arthur

Physics
A boy with a mass of 40kg is seated a distance of 3.0m from the fulcrum of a seesaw. a. Calculate the load force exerted by the boy (Hint: What force is pulling him down?) b. Calculate the torque exerted by the boy. c. If his sister with a mass of 24 kg wants to balance the ...
Thursday, April 28, 2016 by Rick

Physics
An object attached to a 0.5 m string completes 4 rotations in one second. find the linear velocity(m/s) and the angular velocity(rad/s).
Thursday, April 28, 2016 by Anonymous

Physics
The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is _______ s.
Thursday, April 28, 2016 by Hanny

Physics
A 0.50 kg mass is attached to the end of a string swing in a vertical circle(radius=2.0m). When the sting is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?
Thursday, April 28, 2016 by Anonymous

Physics
I want to know how they found out the value of G
Thursday, April 28, 2016 by Akhter

Physics help
how much more intense is 75 db compared to 25 db
Thursday, April 28, 2016 by Anonymous

Physics.. Force and pressure
A tank 4m long, 3m wide and 2m is filled to the brim with paraffin. (density 800kg /m3) calculate the pressure on the base.
Thursday, April 28, 2016 by Joel seth

Physics
Two positive charges one 2uc and the other 7uc are separated by a distance of 20cm, what is the magnitude of the electrostatic force that each charge exerts upon the other
Thursday, April 28, 2016 by Anonymous

Physics
Two positive charges one 2uc and the other 7uc are separated by a distance of 20cm, what is the magnitude of the electrostatic force that each charge exerts upon the other
Thursday, April 28, 2016 by Rushmond

physics explanation
When a baseball gets hit by a baseball bat, what different mechanical models would be used to find where the ball will land, how & when each Mechanical model would be put to use, and how each model describes & explains motions
Wednesday, April 27, 2016 by Anonymous

Physics
A container of gas is at a pressure of 1.3x10^5 Pa and a volume of 6.0m^3. How much work is done by the gas if it expands at constant pressure to twice its initial volume? Please help ;_;
Wednesday, April 27, 2016 by IDK

Physics
An archer puts a 0.29 kg arrow to the bow- string. An average force of 224.8 N is exerted to draw the string back 1.44 m. The acceleration of gravity is 9.8 m/s2 . Assuming no frictional loss, with what speed does the arrow leave the bow? Answer in units of m/s.
Wednesday, April 27, 2016 by Ryan

Physics Volume question!!!
You are watering your lawn with a hose when you put your finger over the hose opening to increase the distance the water reaches. If you are pointing the hose at the same angle and the distance the water reaches increases by a factor of 4, what fraction of the hose opening did...
Wednesday, April 27, 2016 by Samantha

Physics Rolling Motion!!
A spherically symmetric object with radius R= 0.51m and mass of M= 3.5kg rolls without slipping accross a horizontal surface with velocity of V = 4.4m/s. It then rolls up an incline with an angle of 30 degrees and comes to rest a distance d = 2.2m up the incline, before ...
Wednesday, April 27, 2016 by Pam

Physics
a cube slides down a frictionless incline as shown and inelastically strikes a cube at the battom of the incline that's 1/2 (one-half) it's mass. The coeff. of restitution between the two masses is 0.7. If incline is 30 cm high and table is 90cm off floor, at what ...
Wednesday, April 27, 2016 by Emily

Physics! Volume!! HELP
An object hanging on a scale reads 24.0g when submerged in water, but 48.0 g when submerged in oil (specific gravity 0.80) Find the density of the object.
Wednesday, April 27, 2016 by Mark

PHYSICS VOLUME QUESTION!
You are watering your lawn with a hose when you put your finger over the hose opening to increase the distance the water reaches. If you are pointing the hose at the same angle and the distance the water reaches increases by a factor of 4, what fraction of the hose opening did...
Wednesday, April 27, 2016 by Steph

Physics
A spring of natural length 1.5m is extended 0.0050m by a force of 0.8N, what will its length be when the applied force is 3.2N?
Wednesday, April 27, 2016 by Emzkidinn.tk

Physics
What is the maximum mass of a rubber block that can be pulled by a rope whose maximum tension is 3500N? The block is sitting on dry asphalt. (By the way, 1.2 would be used as the coefficient of static friction and 0.8 is the coefficient of kinetic friction for rubber substance...
Wednesday, April 27, 2016 by Kid

Physics
A plane travels 1000 km at an angle of 40 degrees East to North, then changes direction and travels 500 km at an angle of 20 degrees North to East. What is the magnitude and direction of the planes total displacement?
Wednesday, April 27, 2016 by Anonymous

Physics
A plane travels 1000 km at an angle of 40 degrees East to North, then changes direction and travels 500 km at an angle of 20 degrees North to East. What is the magnitude and direction of the planes total displacement?
Wednesday, April 27, 2016 by Ben

Physics
Why they need to use gravitational constant in the formula? What would be the problem if the formula is like F=m1*m2/d2 ?
Wednesday, April 27, 2016 by Akhter

physics
A leaky bucket is being lifted 20 meters. It originally holds 10 kilograms of water, and at the end of its journey it holds 5 kilos. How much work does it take to lift the bucket?
Wednesday, April 27, 2016 by ChrismB

physics
The half-life of the plutonium isotope is 24,360 years. If 10 grams of plotonium is released into the atmosphere by a nuclear accident, how many years will it take for 80% of the isotope to decay?
Wednesday, April 27, 2016 by ChrismB

physics
A force of 2-Newtons will stretch a rubber band 2/100 meters. Assuming that Hooke’s Law applies, how far with a force of 4-Newtons stretch the rubber band? How much work does it take to stretch the rubber band this far?
Wednesday, April 27, 2016 by ChrismB

Physics
A bullet of mass 200 grams is forced with work speed of 400 m/s of it is stopped in 100 m, Find: a.) KE b.) Force needed to stop it
Wednesday, April 27, 2016 by Chantal

physics
A 10kg block slides towards the 3kg moving block to create a totally inelastic head on collision. The 3kg block comes to a stop after the collision. 1. What speed must the 10kg block be moving at prior to the collision for this to occur? 2. Instead of sliding along a ...
Wednesday, April 27, 2016 by anna

physics
home / study / science / physics / questions and answers / a 10kg block slides towards the 3kg moving block ... Your question has been answered! Rate it below. Let us know if you got a helpful answer. Question A 10kg block slides towards the 3kg moving block to create a ...
Wednesday, April 27, 2016 by anna

physics
home / study / science / physics / questions and answers / a block of mass 3kg s sliding along the frictionless ... Question A block of mass 3kg s sliding along the frictionless horizontal surface with a speed of 2m/s. 1. What is the kinetic energy of the block? 2. A wedge is ...
Wednesday, April 27, 2016 by anna

PHYSICS-
Given a plastic rod and fur,explain how you would charge the electroscope positively and negatively.
Wednesday, April 27, 2016 by DICKSON.C

physics
Agirl holding aball of diameter 30cm stands 4m in front of a large flat miror . Where and how large is the of the ball?
Wednesday, April 27, 2016 by muxibo

physics
a helium atom is in one of its single states.one of the electrons is in an p-state and the other a D-sate.the atom is placed in a magnetic field,B,of strengh 3 tesla. sketch a diagram showing the degenerated states and all permissible transition from D-state b)Determine by how...
Wednesday, April 27, 2016 by thomas

Physics
A ball of mass m=4.6, at one end of a string of length L=6.6, rotates in a vertical circle just fast enough to prevent the string from going slack at the top of the circle. Assuming mechanical energy is conserved, the speed of the ball at the bottom of the circle is:
Wednesday, April 27, 2016 by Motaseam

physics
a stone of mass 50g is released from rest, Calculate it's kinetic energy after 6s from the beginning of the motion
Wednesday, April 27, 2016 by Badran

physics
an archer standing on a cliff 48m above the level field below shoots an arrow at an angle of 30• above horizontal with a speed of 80m/s.how far from the base of the cliff will the arrow land.
Wednesday, April 27, 2016 by lesar

physics
A car A is 300m behind a car B and both are travelling in the same direction at 25m/s. Both cars begin at the same moment to accelerate at steady rate, but A has a greater acceleration and passes B in 20sec by which time B is doing 27•5m/s. Neglecting the length of the ...
Wednesday, April 27, 2016 by Francis

Physics
A boy stands between two vertical wall and fires a rifle. Under what condition will he hear a single echo from both walls? Calculate the distance between the walls if the single echo is heard six seconds later
Wednesday, April 27, 2016 by Judith

physics
a cube slides down a frictionless incline as shown and inelastically strikes a cube at the battom of the incline that's 1/2 (one-half) it's mass. The coeff. of restitution between the two masses is 0.7. If incline is 30 cm high and table is 90cm off floor, at what ...
Tuesday, April 26, 2016 by Emily

PHYSICS HELP!
1. A 125-gram projectile strikes a 1.45 kg block that's attached to a massless vertical pole & becomes embedded in the block causing the bullet & block to swing upward. The overall length of the pole & the block combined is 1.1m. The bullet & block at the highest point ...
Tuesday, April 26, 2016 by A

PHYSICS ROLLING MOTION!!!
A unicycle with a tire 44.0 cm in diameter travels 2.00 km. How many revolutions does the wheel make?
Tuesday, April 26, 2016 by Steph

AP Physics
A car with a mass of 1200 kg kg starts from rest and accelerates to a speed of 12 m/s in 12.2 s. Assume that the force of resistance remains constant at 328 N during this time. What is the average power developed by the car’s engine? Answer in units of W.
Tuesday, April 26, 2016 by Anonymous

PHYSICS HELP DENSITY
An object hanging on a scale reads 24.0g when submerged in water, but 48.0g when submerged in oil (specific gravity 0.80) Find the density of the object.
Tuesday, April 26, 2016 by Steph

physics
A thin rod has a length of 0.25 m and rotates in a circle on a frictionless tabletop. The axis is perpendicular to the length of the rod at one of its ends. The rod has an angular velocity of 0.33 rad/s and a moment of inertia of 1.40 10-3 kg · m2. A bug standing on the...
Tuesday, April 26, 2016 by mnjk

Physics
Many hot-water heating systems have a reservoir tank connected directly to the pipeline, so as to allow for expansion when the water becomes hot. The heating system of a house has 57.4 m of copper pipe whose inside radius is 7.52 x 10- 3 m. When the water and pipe are heated ...
Tuesday, April 26, 2016 by Noodle man

Physics
Please help me solve this, most likely simple, problem. I am just starting to learn physics and am finding it very confusing. If you could include a key to explain any formulas used it would be very helpful thank you. I have calculated GPE to be 1500J but I am totally stuck, I...
Tuesday, April 26, 2016 by Rich

physics
A splash is heard 3.12s after a stone is dropped into a well 45m deep.the speed of sound in air is(g=10m/s2)
Tuesday, April 26, 2016 by payal

Physics
A block of weight 3.8 N is launched up a 30 ∘ inclined plane of length 2.20 m by a spring with spring constant 2.40 kN/m and maximum compression 0.10 m . The coefficient of kinetic friction is 0.50. f so, how much kinetic energy does it have there; if not, how close to ...
Tuesday, April 26, 2016 by Megan

Physics
A car moving at 37 km/h negotiates a 140 m -radius banked turn designed for 60 km/h . What coefficient of friction is needed to keep the car on the road?
Monday, April 25, 2016 by Megan

Physics
How much heat is required to change a 35.8 g ice cube from ice at -12.7°C to water at 45°C? (if necessary, use cice=2090 J/kg°C and csteam= 2010 J/kg°C)How much heat is required to change a 35.8 g ice cube from ice at -12.7°C to steam at 113°C?
Monday, April 25, 2016 by Sam

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Homework Help: Science