Friday
September 4, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
A ball is thrown straight upward from ground level with a velocity of 41 m/s How much time passes before the ball strikes the ground? Disregard air resistance.
Thursday, May 7, 2015 by angela

PHYSICS
Consider a classroom 10.0m long by 6.0m wide by 4.0m high at "room temperature" 20.C and 1.0 atmosphere. A) How many moles of gas are contained in the room? B) Assuming an average molecular weight of 28, what is the mass of the room air?
Thursday, May 7, 2015 by Physics

Physics
Suppose you're an astronaut and you're sitting in a 6000kg space capsule riding on a 4000 m x 8000 m sail (whose mass is included in the 6000 kg). You're orbiting in the vicinity of a distant bright hot star giving off light with an intensity 8 x 10^9 W/m^2 at a ...
Thursday, May 7, 2015 by M

Physics
Suppose two conducting wires each of mass 25g and length 40m are both hanging from a support beam. When the circuit is turned on, the wires repel each other so that the angle between the supporting strings is 30 degrees at a height 5cm below the support beam. A. Are the ...
Thursday, May 7, 2015 by M

Physics
Suppose a light wave is in the visible spectrum, with frequency 740 THz(which will have a deep purple color). What will be the ratio of the electric to magnetic fields constitute the light wave? What fraction of the total energy is conveyed by the electric field?
Thursday, May 7, 2015 by M

Physics
Suppose two charged conducting wires each have current I, and they're placed parallel to each other. Fins the line charge density that needs to be placed on each wire so that the electric repulsion between them balances the magnetostatic force so that they are in equilibrium.
Thursday, May 7, 2015 by M

Physics
Suppose a 7kg bob is hanging from the ceiling in a region with uniform electric field E= 46x + 29y N/C. Find the charge on the bob if it's angular position is displaced from the vertical by 20 degrees.
Thursday, May 7, 2015 by M

physics
Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 521 nm, determine the number of photons per second per square meter that reach the earth.
Wednesday, May 6, 2015 by selu

Physics
In an AC circuit with a frequency 25 Hz producing an rms voltage of 30 V and a 20 farad capacitor, what is the end current?
Wednesday, May 6, 2015 by M

Physics
In an ac circuit with frequency 25 Hz producing an rms voltage of 30 V and a 30 Henry inductor, what is the rms current going through the inductor?
Wednesday, May 6, 2015 by M

physics
A rain cloud contains 3.56 x 107 kg of water vapor. How long would it take (in seconds) for a 4.5 kW pump to raise the same amount of water to the cloud which has an altitude of 1741.4 meters?
Wednesday, May 6, 2015 by raeg

Physics
A weather balloon is released at an altitude of 500m. The force of gravity on the balloon is 21.1n. The lift force provided by the atmosphere is 18.7n. Which of the following is true about the balloon? a. The balloon rises at constant velocity. b. the net force on the balloon...
Wednesday, May 6, 2015 by Katie

Physics
A sled mass of 40 kg is pulled along a snow covered surface. The coefficient of static friction is 0.40 and the coefficient of sliding friction is 0.25 a) what force is needed to start the sled moving? b)what force is needed to start to keep the sled moving at a constant speed...
Wednesday, May 6, 2015 by Sarah

Physics
A sled mass of 40 kg is pulled along a snow covered surface. The coefficient of static friction is 0.40 and the coefficient of sliding friction is 0.25 a) what force is needed to start the sled moving? b)what force is needed to start to keep the sled moving at a constant speed...
Wednesday, May 6, 2015 by Sarah

physics
water is flowing at 3 m/s in a horizontal pipe under a pressure of 200 kpa. the pipe, which narrows to half its original diameter, is laid out on a level ground? a) what is the speed of flow in the narrow section? b) what is the pressure in the narrow section? c)how do the ...
Wednesday, May 6, 2015 by Arnel Comia

Physics
we have an unknown mass of water at an initial temp of 35 degrees C and 100 g ice cube at -5 degrees, the final temp is 5 degrees. What is the mass of the water? Specific heat of ice is 2100 j/(kg*k) latent heat of fusion of ice is 333.7 kj/kg
Tuesday, May 5, 2015 by Amber

Physics
Not sure what formula to use.. im given the molar mass of a molecule the temperature it's at and the distance it traveled, and im looking for the time it takes to travel that distance
Tuesday, May 5, 2015 by Amber

physics
Consider three charges arranged in a triangle as shown. + - + 0.266 m 0.599 m −3.4 nC 8.1 nC 4.8 nC y x What is the net electric force on the charge at the origin? The value of the Coulomb constant is 8.99 × 109 N · m2 /C 2 . Answer in units of N. 010 (part ...
Tuesday, May 5, 2015 by jamie

physics
4. Three point charges, +6.3 µC, +2.3 µC, and −3.4 µC, lie along the x-axis at 0 cm, 2.6 cm, and 5.2 cm, respectively. What is the force exerted on q1 by the other two charges? (To the right is positive.) The Coulomb constant is 8.99 × 109 N &...
Tuesday, May 5, 2015 by jamie

Physics
A paperboy moves at 3 m/s delivering newspaper. He throws a newspaper directly behind himself at 3 m/s, in the frame of reference of someone standing nearby, what is the motion of the newspaper?
Tuesday, May 5, 2015 by TRW

Physics
A rowboat is moving at 3 km/hr straight across a river from north to south and the river is flowing east at 4 km/hr. What is the resultant velocity?
Tuesday, May 5, 2015 by TRW

Physics
Test Bank, Question 13 In a classroom demonstration, a 79.2-kg physics professor lies on a "bed of nails." The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. ...
Tuesday, May 5, 2015 by Seham

Physics
A stone is thrown vertically upward with a speed of 12.0 m/s. (a) How fast is it moving when it reaches a height of 5.0 m? (b) How long is required to reach this height?
Tuesday, May 5, 2015 by Shing

physics
A spring has an unstretched length of 20 cm. A 100 g mass hanging from the spring stretches it to an equilateral length of 30 cm. suppose the mass is pulled down to where the spring's length is 40 cm. When it is released, it begins to oscillate. What is the amplitude of ...
Monday, May 4, 2015 by Marie Barrientos

Physics
The standard sampling rate (in Hz) used for sampling speech signals in telephony systems is 8 kHz with 8 bits assigned per sample. Based on this fact, calculate how much time it would take to transmit one second of raw digitized speech over a transmission line that has the ...
Monday, May 4, 2015 by Sabrina

physics
Find the total change in the internal energy of a gas that is subjected to the following two-step process. In the first step the gas is made to go through isochoric heating until it gains 5963 J and its pressure is 3.12 105 Pa. In the second step it is subjected to isobaric ...
Monday, May 4, 2015 by Anonymous

physics
The length of a moving spaceship is 27.0 m according to an astronaut on the spaceship. If the spaceship is contracted by 14.5 cm according to an Earth observer, what is the speed of the spaceship? I know L=27m and delta L= 0.145 so our contracted length is 26.855 so what ...
Monday, May 4, 2015 by Robby

Physics
a 4.0 cm high object is placed 5.10 cm from a concave mirror whose redius of curvature is 21.2 cm. Find the inmage distance and the image size.
Monday, May 4, 2015 by Jacbo

PHYSICS PLEASE HELP
When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume that the star is a...
Monday, May 4, 2015 by KS

Physics
A horizontal overhead power line carries a current of 500A in west to east direction. What is the magnetic field 1.5m below? What is it's direction?
Monday, May 4, 2015 by Shifa

Physics
A 24V lamp has a resistance of 8.0 ohms. What resistance must be placed in series with the lamp if it is to be used in a 117V line? I think I understand how resistors work but this HW question is completely over my head..
Monday, May 4, 2015 by John Q

physics
A fixed mass of gas has a pressure of 8700 Pa, a volume of 10.5 m3 and temperature of 68 °C. The pressure and volume of the gas are changed to 9 243 Pa and 14.4 m3. The new temperature of the gas is
Monday, May 4, 2015 by danny

PHYSICS
Please help me, I don't understand how to solve this: When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple...
Monday, May 4, 2015 by Anonymous

Physics
Given an object distance of 48[mm] and a thin-lens focal length of 110[mm], then what is the image distance? What is the scale factor (M) of the image seen in the previous question?
Sunday, May 3, 2015 by Bri

physics
A cube has a density of 2200kg/m3 while at rest in the laboratory. What is the cube's density as measured by an experimenter in the laboratory as the cube moves through the laboratory at 81.0{\rm \\%} of the speed of light in a direction perpendicular to one of its faces?
Sunday, May 3, 2015 by Anonymous

Physics
Prove that if an object is at a distance of twice the focal length from a lens the image is the same size as the object. Show this using an algabraic method.
Sunday, May 3, 2015 by Anonymous

physics
Bill has a mass of 66.9 kg. Jane has a mass of 58.8 kg. If they are seated 2.2 m apart, how much gravitational force attracts them?
Sunday, May 3, 2015 by liz

PHYSICS
When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume that the star is a...
Sunday, May 3, 2015 by Anonymous

physics
vibrating a long spring with a succession of pulses with a frequency of 50Hz produces adjacent nodes that are separated by 3.5cm. what is the velocity of the longitudinal waves formed?
Sunday, May 3, 2015 by Anonymous

Physics
Consider two students, a 65 kg guy and a 50 kg girl who are attracted to each other, gravitationally, that is. They sit next to each other in Physics class which means there is 1.5m between their centers. What is the magnitude of the force of gravity between these two students...
Sunday, May 3, 2015 by Maria

Physics Help Please
A 35-mm camera equipped with a 40-mm focal length lens is used to photograph a tree 17 m tall. If a 32-mm high image of the tree on the CCD sensor is required, how far should the camera lens be from the tree? Show Work Please! Thank you so much!
Sunday, May 3, 2015 by Need Help Urgent

physics
Francesca, who likes physics experiments, dangles her watch from a thin piece of string while the jetliner she is in takes off from JFK Airport. She notices that the string makes an angle of 25° with respect to the vertical as the aircraft accelerates for takeoff, which ...
Sunday, May 3, 2015 by Scar

physics
a box is given a push so that it slides across the floor. how far will it go, given that the coefficient of kinetic friction is 0.2 and the push imparts an initial speed of 4m/s?
Sunday, May 3, 2015 by Scar

physics
a box is given a push so that it slides across the floor. how far will it go, given that the coefficient of kinetic friction is 0 .2 and the push imparts an initial speed of 4m/s?
Sunday, May 3, 2015 by Scar

PHYSICS
When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume that the star is a...
Saturday, May 2, 2015 by Anonymous

PHYSICS
A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. The coefficient of static friction between the ground and the lower end of the board is 0.750. Find the smallest value for the angle , such that the lower end of ...
Saturday, May 2, 2015 by Anonymous

PHYSICS
A hiker, who weighs 977 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 4500 N, and rests on two concrete supports, one on each end. He stops 1/6 of the way along the bridge. What is the magnitude of the force that a ...
Saturday, May 2, 2015 by Anonymous

PHYSICS
The figure shows a jet engine suspended beneath the wing of an airplane. The weight of the engine is 14600 N and acts as shown in the figure. In flight the engine produces a thrust of 55100 N that is parallel to the ground. The rotational axis in the figure is perpendicular to...
Saturday, May 2, 2015 by Anonymous

Physics Helpppp
Q11 a(ii)A sinusoidal carrier wave has frequency 500 kHz and amplitude 6.0 V. It is to be frequency modulated by a sinusoidal wave of frequency 8 kHz and amplitude 1.5 V. The frequency deviation of the carrier wave is 20 kHz V^–1 Describe, for the carrier wave, the ...
Saturday, May 2, 2015 by Ariana

Physics Help Please
Scientists at Oak Ridge National Laboratory confirmed the existence of element 104 by creating 3000 atoms of it. If radioactive decay caused the number of atoms to drop by half within 4.0 s, how many atoms were left after 12 s? Show work please! Thank you!
Saturday, May 2, 2015 by Kim

physics
A hydraulic jack is used to lift a 2600 pound car. If the output piston (the one the car is sitting on) has an area of 60 square inches, how much force must be applied to the 0.5 square inch input piston to lift the car? ______ pounds.
Saturday, May 2, 2015 by Amy

Physics Help Please
A 35-mm camera equipped with a 40-mm focal length lens is used to photograph a tree 17 m tall. If a 32-mm high image of the tree on the CCD sensor is required, how far should the camera lens be from the tree? Show Work Please! Thank you so much!
Saturday, May 2, 2015 by Need Help Urgent

Physics Help Please --- Telescope
An astronomical refracting telescope is made from two lenses. the objective lens has a focal length of 114 cm, and the eyepiece lens has a focal length of 17 cm. a) What is the total length of the telescope? b) What is the angular magnification of the telescope? c) What is the...
Saturday, May 2, 2015 by Tanya

physics
suppose you want to know the amount of heat heat needed to raise the temperature of 2kg of copper by 10 degrees.what property of copper do yiu need to know?
Saturday, May 2, 2015 by fredericks

Physics
A 1.4-kg object moves along the x axis, subject to the potential energy shown in the figure. If the object's speed at point B is 1.70 m/s, what are the approximate locations of its turning points? ___________m (left-hand turning point) ___________m (right-hand turning ...
Saturday, May 2, 2015 by Anonymous

Physics
A 1.4-kg object moves along the x axis, subject to the potential energy shown in the figure. If the object's speed at point B is 1.70 m/s, what are the approximate locations of its turning points? ___________m (left-hand turning point) ___________m (right-hand turning point)
Saturday, May 2, 2015 by Anonymous

Physics Help Please --- Urgent
A thin converging lens is found to form an image of a distant building 24 cm from the lens. If an insect is now placed 16 cm from this lens, how far FROM THE INSECT will its image be formed? A) 64 cm B) 72 cm C) 32 cm D) 96 cm E) 48 cm
Saturday, May 2, 2015 by Tanya

physics
GPS satellites orbit the earth about 20,000 km above the surface of the earth. The radius of the earth is 6,371 km. What is the acceleration due to earth’s gravity on the GPS satellites? i've tried fooling around with the A = V^2/ R and V = 2pir/T equations, but I ...
Friday, May 1, 2015 by Dylan

Physics
Three positive point charges are arranged in a triangular pattern in a plane as shown. + 2 nC + 4 nC + 6 nC Distance between all: 7 m I dont know how to d this part: Find the magnitude of the net electric force on the 4 nC charge. The Coulomb constant is 8.98755 × 109 N...
Friday, May 1, 2015 by asd

Physics
I know this is so simple but for some reason I am having a brain fart... A 20 C charge experiences a 2 N force in an electric field. What is the strength of the electric field? Please help and laugh later thank you lol
Friday, May 1, 2015 by Trevor

10th grade physics
What speed must a bucket of water have to complete a circle with a radius of 1.2 m without spilling any water? My answer: this seems to be an incomplete question, not solvable without the weight of the bucket
Friday, May 1, 2015 by kevin

PHYSICS
WHAT IS CENTER OF MASS?
Friday, May 1, 2015 by H

physics
a spherical balloon of diameter 2m is filled with helium.Assume STP .how much is contained in the balloon helium
Friday, May 1, 2015 by Anonymous

Physics
Mass m2 rests on an incline and attaches to a string that goes over a pulley, where mass m1 hangs on the other side of the incline. Assume that there is no friction between m2 and the incline, that m2 = 5.1 kg, m1 = 0.9 kg, the radius of the pulley is 0.10 m, the moment of ...
Friday, May 1, 2015 by James

Physics
If the current in a wire of a CD player is 1.10 mA, how long would it take for 3.40 C of charge to pass a point in this wire?physi
Thursday, April 30, 2015 by Chris

Physics
Update: Planets are not uniform inside. Normally, they are densest at the center and have decreasing density outward toward the surface. Model a spherically symmetric planet, with the same radius as the earth, as having a density that decreases linearly with distance from the ...
Thursday, April 30, 2015 by Katie

Physics
Two electrostatic point charges of +60.0 μC and +57.0 μC exert a repulsive force on each other of 161 N. What is the distance between the two charges? The value of the Coulomb constant is 8.98755 × 109 N · m2/C2. Answer in units of m.
Thursday, April 30, 2015 by Chris

physics
four equal charges 2*10^-6c each are fixed at the four corner of a square of side 5cm.find the coulumb force experinced by one of the charge due to rest three
Thursday, April 30, 2015 by nikhil gupta

physics
four equal charges 2*10^-6c each are fixed at the four corner of a square of side 5cm.find the coulumb force experinced by one of the charge due to rest three
Thursday, April 30, 2015 by nikhil

Physics
The lens and mirror in the figure below are separated by d = 1.00 m and have focal lengths of +74.8 cm and -42.2 cm, respectively. An object is placed p = 1.00 m to the left of the lens as shown.
Thursday, April 30, 2015 by Austin

physics
just a question out of curiosity... Why is it that when you stretch a rubber band between your thumbs the same length both sides of the rubber band make two different sounds? Is it because the sound waves are at different velocities or frequencies?
Thursday, April 30, 2015 by jake

SOLVE -MATH
A physics exam consists of 9 multiple choice questions and 6 open-ended problems in which all work must be shown.If an examinee must answer 6 of the multiple- choice questions and 3 of the open-ended problems, in how many ways can the questions and problems be chosen?
Thursday, April 30, 2015 by JORDAN

physics
2. An object is 20.0 cm from a converging lens, and the image falls on a screen. When the object is moved 4.00 cm closer to the lens, the screen must be moved 2.70 cm farther away from the lens to register a sharp image. Determine the focal length of the lens.
Thursday, April 30, 2015 by tasha

Physics
An X-ray tube used for cancer therapy oper- ates at 8.8 MV with a beam current of 19 mA striking a metal target. Calculate the power of this beam.
Thursday, April 30, 2015 by Chris

Physics
A racket exerted an average force of 152.0 N on a ball initially at rest. If the ball has a mass of 0.070 kg and was in contact with the racket for 0.030 s, what was the kinetic energy of the ball as it left the racket?
Thursday, April 30, 2015 by Maria

Physics
A net charge of 73 mC passes through the cross-sectional area of a wire in 9 s . What is the current in the wire? The fun- damental charge is 1.602 × 10−19 C.
Thursday, April 30, 2015 by Chris

MATH
A physics exam consists of 9 multiple choice questions and 6 open-ended problems in which all work must be shown.If an examinee must answer 6 of the multiple- choice questions and 3 of the open-ended problems, in how many ways can the questions and problems be chosen?
Thursday, April 30, 2015 by STAR ---- HELP.....

physics
Two +'ve charges separated by a distance 2m each other with a force of 0.36N. If the combined charge is 26mc , the charges are
Thursday, April 30, 2015 by Thirumal

physics
A football kicker can give the ball an initial speed of 25m/s. What are the greatest and least elevation angles at which he can kick the ball to score a field goal from a point 50m in front of goalposts whose horizontal bar is 3.44m above the ground?
Thursday, April 30, 2015 by john

physics
A stone is dropped from the top of a cliff which is 100m high. At the same time another stone is vertically thrown upwards from the foot of the cliff woth a speed of 40m/s.AT what height and when do the stones meet
Thursday, April 30, 2015 by asgf

physics
bull's-eye bob at a hunting range fires his rifle at a target 200 meters downrange. the bullet moves horizontally from the rifle barrel with a speed of 400 m/s? how far does the bullet drop from a straight line horizontal path bny the time it reaches the target
Wednesday, April 29, 2015 by Anonymous

physics
A 16lb block rests on a horizontal frictionless surface. A cord attached to the block, running horizontally, passes over a pulley whose diameter is 6in, to a hanging block weighing 16lb. The system is released from rest, and the blocks are observed to move 8.1ft in 5s. What is...
Wednesday, April 29, 2015 by I Don't Know

physics
A smooth body slides down a plane inclined at an angle of 60degree to the horizontal calculate, A. The components of the acceleration of the body. B. Along the inclined plane. C. Perpendicular to the plane. D. The velocity of the body at the base of the plane after 10s. E. The...
Wednesday, April 29, 2015 by Marino

PHYSICS
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = 2.5 N/C, Ey = Ez = 0. If the velocity of the particle at t = 0 is given by vy = 50 m/s, vx = vz = 0, what is the speed of the particle at t = 2.0 s?
Wednesday, April 29, 2015 by Mary

physics
A tennis ball is thrown vertically upwards from the ground with a velocity of 50m/s calculate.1.the maximum height reached. 2.the time to reached the maximum height. 3.the time of flight
Wednesday, April 29, 2015 by Marino

Physics
What is the velocity of an object that is dropped from a height of 20m,just before it reaches the ground?
Wednesday, April 29, 2015 by Anonymous

physics
a diver of mass 101 kg jumps upward off a diving board into water. Diving board is 6m above water. Driver has a speed of 1.2m/s. based on speed how high above the board will she rise?
Wednesday, April 29, 2015 by danaja

chemistry
Table of enthalpy of solution for selected cesium salts Compound and ΔsolH kJ mol-1: - Cesium bromide: 25.98 - Cesium iodide: 33.35 - Cesium chloride: 17.78 - Cesium fluoride monohydrate: -10.46 - Cesium fluoride sesquihydrate (·1.5H2O): -5.44 Data taken from CRC ...
Wednesday, April 29, 2015 by john

physics
A uniform plank of seesaw is 5meter long.a boy weighing40kgf sits 1.5meter from the one end.what will be the distance of a girl weighing 25kgf sit at other end,so as to balance the seesaw.
Wednesday, April 29, 2015 by nitesh srivastava

physics
two charges of equal magnitude are 25.5 cm apart if the force between the charges is 155 N what is the magnitude of the charges
Tuesday, April 28, 2015 by j

Physics Help Please! Decay Questions
archaeologist digging at the site of an ancient settlement discover the remains of a wooden structure. carbon 14 dating of the wood from the structure finds a decay rate of 180 decays/min. Knowing that the decay rate for living wood is 600 decays/min and the decay constant for...
Tuesday, April 28, 2015 by Anonymous

Physics
A satellite has a mass of 6445 kg and is in a circular orbit 4.14 × 105 m above the surface of a planet. The period of the orbit is 2.1 hours. The radius of the planet is 4.52 × 106 m. What would be the true weight of the satellite if it were at rest on the planet...
Tuesday, April 28, 2015 by Sandra

Physics
A car skidded on a roadway that has a coefficient of friction with the road of 0.7. A police officer measured the skid marks and noted them to be 100 feet long. Two years later at trial, the lawyer for the driver argues that the officer did not measure the skid marks correctly...
Tuesday, April 28, 2015 by Hassan

Physics Help Please
archaeologist digging at the site of an ancient settlement discover the remains of a wooden structure. carbon 14 dating of the wood from the structure finds a decay rate of 180 decays/min. Knowing that the decay rate for living wood is 600 decays/min and the decay constant for...
Tuesday, April 28, 2015 by Anonymous

Physics
Calculate the work required to pull a wagon along a horizontal road for 4.0x10^2 m at a constant speed of 3.0 m/s if the force of friction is 8.0 N.
Tuesday, April 28, 2015 by Richard

Physics - Half Life Question Check!!!
An ancient rock is found to contain 40Ar gas, indicating that 77% of the 40K in the rock has decayed since the rock solidified. Any argon would have boiled out of liquid rock. How long ago did the rock solidify? The half-life of 40K is 1.25 billion years. A) 2.6 billion years ...
Tuesday, April 28, 2015 by Meli

Physics
Microwaves travel at the speed of light, 3.00 × 108 m/s. When the frequency of microwaves is 5.93× 109 Hz, what is their wavelength? Answer in units of m.
Tuesday, April 28, 2015 by Axel

PHYSICS PLEASE HELP
A very large firecracker explodes in the hallway into 3 fragments. Physics students rush to the scene to enrich their knowledge of the law of conservation of momentum. They report that Fragment 1: mass=1.23kg, v=8.70m/s, north Fragment 2: mass =2.60kg,v=6.10m/s,east fragment 3...
Tuesday, April 28, 2015 by Maddie

Physics please help
He drops a ninja ball device from a height of 10.0m. The mass of the enter device is 190g and the mass of the top (smallest) ball is 2.90g A) calculate the momentum of the device as it hits the ground (ignore air resistance) I know that this answer is 2.66 for sure B) if the ...
Tuesday, April 28, 2015 by Maddie

Physics
Periodic waves spread out over the surface of a lake where two women, Jenna and Mel, are fishing in separate boats 97 meters apart. Each woman's boat bobs up and down 31/min. At a time when Jenna's boat is at a crest, Mel's boat is at its lowest point, and there ...
Tuesday, April 28, 2015 by Anonymous

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