Wednesday
August 31, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
ABC is a equilateral triangle of side 0.03m. Charges of +5nC and -5nC are placed at the corner A and C find the resultent electric intensity at B.
Tuesday, April 12, 2016 by Puneeth

AP Physics
Point A is 2.0 meters away from a charge of -3.o(Mu) and 3.0 meters away from a charge of +1.5(Mu) as shown. A) Find the net Electric field at point A B) Find the total electric potential at point A.
Tuesday, April 12, 2016 by samantha

AP Physics
Two identical, small balls are suspended by separate 0.25m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0 x 10^-4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and, as a ...
Tuesday, April 12, 2016 by samantha

physics
a 2.2 kg ball is dropped from 3m above vertical spring whose spring constant is 450 n/m. a) how far will it compress the spring? b.) what velocity will the ball have when it leaves the spring again?
Tuesday, April 12, 2016 by Anne

Physics
A 5kg box is pulled for a distance of 12m with a force of 20N along frictionless surface. The force is applied at an angle that is 15 deg. above the horizontal. a.) how much work was done by the applied force? b) how fast will the box be moving at the end of the 12m if it ...
Tuesday, April 12, 2016 by Anne

Physics
A fan is rotating at 50 rad/s. When turned off it slows down to a stop in 90 seconds. How many rev's does the fan make in coming to a stop?
Tuesday, April 12, 2016 by Wayne

physics
Suppose that 7.40 g of hydrogen is separated into electrons and protons. Suppose also that the protons are placed at the Earth's north pole and the electrons are placed at the south pole. What is the resulting compressional force on the Earth?
Tuesday, April 12, 2016 by lila

physics
A thin, rigid, uniform rod has a mass of 2.60 kg and a length of 1.69 m. (a) Find the moment of inertia of the rod relative to an axis that is perpendicular to the rod at one end.A thin, rigid, uniform rod has a mass of 2.60 kg and a length of 1.69 m.
Tuesday, April 12, 2016 by reghuir

physics
One end of a thin rod is attached to a pivot, about which it can rotate without friction. Air resistance is absent. The rod has a length of 0.48 m and is uniform. It is hanging vertically straight downward. The end of the rod nearest the floor is given a linear speed v0, so ...
Tuesday, April 12, 2016 by reghuir

Physics
If the angle between the polarizer and the analyzer is 30 degrees, what light intensity would be transmitted through the polarizer and analyzer, respectively? I know the equationg we're supposed to use is: I= Io*cos2(theta), but how do I find the Io? And would the answer ...
Tuesday, April 12, 2016 by Kiara

College Physics
Construct & solve a problem involving a person swimming across a river which has a waterfall some distance downstream. Please help, I have no idea where to start.
Tuesday, April 12, 2016 by Smi

Physics
A stone is dropped from a tower 100 meters above the ground. The stone falls past ground level and into a well. It hits the water at the bottom of the well 5.00 seconds after being dropped from the tower. Calculate the depth of the well. Given: g = -9.81 meters/second2.
Tuesday, April 12, 2016 by Stacy

physics
A mass oscillate with SHM of amplitude A and period T y = A cos (2πt/T). The kinetic energy of the mass is equal with twice the potential energy of the spring at :
Tuesday, April 12, 2016 by JuliePham

Physics Help
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? How would I calculate this? F(net) = F(drag) - F(gravity) F(drag) = F(net) + F(gravity) F(drag) = ma + ...
Tuesday, April 12, 2016 by Alea

physics
An air condenser has an area of 100 cm^2 the plates being 4mm apart. It is connected in series with another condenser having plate area of 20cm^2 plates being separated by dielectric 0.1mm thick with E=2.5. If the potential difference across an condenser is 1000volts; find the...
Tuesday, April 12, 2016 by vicky

Physics
A spring loaded ballistic pendulum gun requires an increasing force to load. When loading a ball of mass 0.054 kg, the spring is compressed 7.00 cm, the gun is fully loaded, and the force required is 70.0 N. a) Calculate the work required to load the gun. b) Calculate the ...
Tuesday, April 12, 2016 by Emily

physics
An air condenser has an area of 100 cm^2 the plates being 4mm apart. It is connected in series with another condenser having plate area of 20cm^2 plates being separated by dielectric 0.1mm thick with E=2.5. If the potential difference across an condenser is 1000volts; find the...
Tuesday, April 12, 2016 by vicky

Physics
A pendulum clock can be approximated as a simple pendulum of length 1.03 m and keeps accurate time at a location where g = 9.82 m/s2. In a location where g = 9.77 m/s2, what must be the new length of the pendulum, such that the clock continues to keep accurate time (that is, ...
Tuesday, April 12, 2016 by Emily

PHYSICS
A 2000kg elevator is attached to a 1800kg counterweight. What power must the motor supply to raise the elevator at 0.4m/s?
Tuesday, April 12, 2016 by a

physics
what will be the speed of a 500 kilogram moving satellite if we apply100N force on it after each second till 10 hours and current velocity of this satellite is 16,800 miles per hour?
Tuesday, April 12, 2016 by vikram

11th grade physics
A parallel condenser of 0.8F is to be constructed using sheets of tin foil each 30cm.25cm and separated by a paraffin waxed paper 0.015cm thick of dielectric constant Find how many sheets of metals are required?
Tuesday, April 12, 2016 by angy

11th grade physics
How do we know which plate has an excess of electrons?
Tuesday, April 12, 2016 by angy

Physics
The Equation of Continuity states that the mass flow rate has the same value at every position along a tube that has a single entry and a single exit point for fluid flow. Basically it boils down to the idea that the fluid doesn’t magically disappear or appear. If 2.0 kg ...
Tuesday, April 12, 2016 by Rachel

Physics
A metal block of mass 1.840 kg is hanging from a string. The tension in the string is 9.972 N. The block is submerged in a beaker of fluid and is stationary. What is the magnitude and direction of the buoyant force acting on the block? Consider making a free body diagram ...
Tuesday, April 12, 2016 by Rachel

physics
The period of an ocean wave is 20 seconds. Calculate the wave's frequency.
Tuesday, April 12, 2016 by Anonymous

physics
If you launch a marble out of a launcher on a table with a given angle, and you know that range( distance it travelled) and time travelled ( if needed). The only force acting upon is gravity. How would you find the initial speed or velocity of the launcher? Is there a formula?
Tuesday, April 12, 2016 by anon

Physics
A child is pushed down a slide from a height of 2.5m with a speed of 7m/s if his mass is 25kg and reaches the ground a speed of 5m/s calculate the coefficient of kinetic friction. Theta = 55 degrees
Tuesday, April 12, 2016 by Hajju Farouk

Physics
A stone is short-cut from a catapult with an initial velocity of 20m/s atan elevation of 40.calculate the velocity of nove height
Tuesday, April 12, 2016 by Raphael

PHYSICS Momentum!! Collision HELP
A ball A of mass .202 kg is moving at a velocity of 2.0 m/s toward a ball B that is at rest. (a) Calculate the initial momentum for Ball A and Ball B. (b) Calculate initial Kinetic energy for Ball A and Ball B. My doubt since its asking for initial moment only, can I simply ...
Tuesday, April 12, 2016 by Pam

physics
Argon is a monatomic gas whose atomic mass is 39.9 u. The temperature of eight grams of argon is raised by 95 K under conditions of constant pressure. Assuming that argon behaves as an ideal gas, how much heat is required?
Monday, April 11, 2016 by jose

PHYSICS Collision of two Balls Momentum!! HELP
A ball A of mass .202 kg is moving at a velocity of 2.0 m/s toward a ball B that is at rest. (a) Calculate the initial momentum for Ball A and Ball B. (b) Calculate initial Kinetic energy for Ball A and Ball B. My doubt since its asking for initial moment only, can I simply ...
Monday, April 11, 2016 by Pam

Physics
How high would you have to lift a 0.294N mouse to do the same amount of work that you would do if you lift a 6.87 kN elephant 1.00cm?
Monday, April 11, 2016 by Chad

Physics
A photon of light has a wavelength of about 600 nm (1nm = 1 x 10-9 m). What is the energy of this photon of light? how do I solve this step by step?
Monday, April 11, 2016 by Alea

PHYSICS HELP!!
(a) Suppose 10 astronauts are sent to Mars and then back to Earth. The average power usage of each astronaut is 10,000,000 joules per day. What is the average power usage of each astronaut in watts and horsepower? (b) It will take approximately 2 years for the astronauts to ...
Monday, April 11, 2016 by Ben

Physics
a lawnmower with a mass of 12 kg is being pushed by a force of 150n horizontally and 40 n down. if the kinetic coefficient of friction between the grass is 0.9, find the force of friction on the lawnmower. Please explain this as well, I am getting an answer but I don't know.
Monday, April 11, 2016 by lomonoyan

Physics
Imagine a vessel containing 2.000 kg of liquid whose specific heat equals 1.50 kcal/kg/°c. Suposse that all of the liquid exists at its vaporization temperature of 450 k. We transfer 150 cal of heat energy to the liquid. What is the temperature of the liquid in the vessel ...
Monday, April 11, 2016 by Jazz

Physics
What is common to all light sources, including incandescent, fluorescent, neon, halogen, laser, and sodium vapor devices?
Monday, April 11, 2016 by Brianna

Physics
Suppose the thickness of an oil film on water is just the right thickness for canceling red light. What color will your eye see? Explain using 3 – 4 complete sentences. Would I see all the colors except for red? Or would I just see the color green? I am not sure
Monday, April 11, 2016 by Alea

Physics
An electron is held 2.10 cm from an vertically aligned infinite charged plane and then released from rest. It accelerates toward the plane to the left and collides with a speed of 1.50×107 m/s .
Monday, April 11, 2016 by James

Physics
Two electrically-charges spheres are suspended from insulated threads a certain distance from each other. There is a certain amount of electrostatic force between them. Describe specifically (not just increase or decrease) what happens to this force in each of the scenarios ...
Monday, April 11, 2016 by Alea

Physics
Along solenoid is wound with 500 turns permeter and the current in its windings is increasing at rate of 20A/s .If the cross sectional area of solenoid 5cm^2.what will be the rate change of magnetic flux
Monday, April 11, 2016 by Ermias

Physics 101
on a uniform beam of length 5m, hangs a mass 30kg at one end. the beam then balances at a point 1.5m from this end. find the mass of the beam(g=10ms-1)
Monday, April 11, 2016 by DOLAPO

PHYSICS!!
Squids and octopuses propel themselves by expelling water. They do this by taking the water into a cavity and then suddenly contracting the cavity, forcing the water to shoot out of an opening. A 6.50 daN squid (including the water in the cavity) that is at rest suddenly sees ...
Monday, April 11, 2016 by Jessica

PHYSICS!!
(a) Suppose 10 astronauts are sent to Mars and then back to Earth. The average power usage of each astronaut is 10,000,000 joules per day. What is the average power usage of each astronaut in watts and horsepower? (b) It will take approximately 2 years for the astronauts to ...
Monday, April 11, 2016 by tom

physics
A light spring of constant k = 95.0 N/m is attached vertically to a table (figure (a)). A 2.70-g balloon is filled with helium (density = 0.179 kg/m3) to a volume of 4.00 m3 and is then connected to the spring, causing the spring to stretch as shown in figure (b). Determine ...
Monday, April 11, 2016 by anna

physics
A 1.00-kg beaker containing 2.29 kg of oil (density = 916 kg/m3) rests on a scale. A 2.33-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below). Find the equilibrium readings of both scales. top scale N bottom scale N
Monday, April 11, 2016 by anna

physics
A spring has an unstretched length of 10 cm . It exerts a restoring force F when stretched to a length of 12 cm . For what total stretched length of the spring is its restoring force 3F? At what compressed length is the restoring force 2F? I keep doing this but I do not think ...
Monday, April 11, 2016 by jessica

Physics
You’re riding your bicycle first west a distance of 7.7 km, then south a distance of 14.1 km. (a) In what direction does your average velocity vector point, in degrees south of west? (b) If the total trip took 18.3 minutes, what is the magnitude of this average velocity, ...
Monday, April 11, 2016 by Bira

Physics
A volleyball is sent over a net, having been launched at a speed 4.6 m/s at an angle 28.2 degrees above the horizontal, from the ground. What is the maximum height, in m, that the net can be placed such that they ball can make it over?
Monday, April 11, 2016 by Bira

Physics
A ball is tossed upward and returns to its original position after 19.7 seconds. If another ball is thrown at an angle of 41.4 degrees above the horizontal, at what speed, in m/s, must it be thrown such that it returns to the same height at the same time as the first ball?
Monday, April 11, 2016 by Bira

Physics
James Bond is chasing a runaway villain across the tops of several buildings. In order to make it from one building to another safely, Bond needs you to calculate how much horizontal speed he needs to jump from one building’s roof to another, with the horizontal distance ...
Monday, April 11, 2016 by Bira

Physics
A baseball is hit and leaves the bat horizontally at a speed of 6.7 m/s. The ball lands 10.3 m from where it was hit. What was the height of the bat at the time it hit the baseball, in m?
Monday, April 11, 2016 by Bira

Physics
A volleyball is sent over a net, having been launched at a speed 5 m/s at an angle 42.7 degrees above the horizontal, from the ground. What is the ball’s speed, in m/s, 2.97 seconds after being launched?
Monday, April 11, 2016 by Bira

Physics
An egg is thrown from the top edge of a 22.9 m high building down onto an unsuspecting person standing on the ground 6.2 m from the base of the building. If the egg is tossed horizontally, at what speed, in m/s, must the egg be thrown such that it lands on the person?
Monday, April 11, 2016 by Bira

Physics
A 1.4 kg box that is sliding on a frictionless surface with a speed of 10 m/s approaches a horizontal spring. The spring has a spring constant of 2000 N/m. (a) How far will the spring be compressed in stopping the box? (b) How far will the spring be compressed when the box'...
Sunday, April 10, 2016 by michael

Physics
A 1100 kg safe is 2.0 m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 40 cm. What is the spring constant of the spring? I don't understand what to do here
Sunday, April 10, 2016 by tom

Physics
A flying squid (family Ommastrephidae) is able to "jump" off the surface of the sea by taking water into its body cavity and then ejecting the water vertically downward. A 0.80 kg squid is able to eject 0.32 kg of water with a speed of 20 m/s. (a) What will be the ...
Sunday, April 10, 2016 by xxxxxxx

Physics
A proton, moving with a velocity of vii, collides elastically with another proton that is initially at rest. Assuming that after the collision the speed of the initially moving proton is 1.50 times the speed of the proton initially at rest, find the following.
Sunday, April 10, 2016 by Dance Queen

physics
A window air conditioner consumes 900 W of electric power and has COP = 2.9.If it runs continuously for 24 h , how much heat gets removed from the house?
Sunday, April 10, 2016 by lizbeth

Physics
A 3.10 kg block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of 43.5 N. What is the coefficient of kinetic friction between the block and the floor? I tried dividing the N by the KG and vise versa but it didn't work
Sunday, April 10, 2016 by xxxxxxx

Physics
An ideal spring hangs vertically from the ceiling. When a 1.0 kg mass hangs from the spring it is extended 5.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10 cm. While the spring is being extended by the ...
Sunday, April 10, 2016 by Joane

physics
Consider the circuit shown below. Assume that the op-amp is ideal. fa2014_fn_diode_opamp2.png Figure 3-1 The diode has the following I-V characteristics: iD=Is*(e^(vD/vth)-1) where iD is the current through the diode,( Is ) is the reverse bias saturation current Vd is the ...
Sunday, April 10, 2016 by bearinthewoods

Physics
Einswine has a mass of 300 kg. He sits on an ideal spring. Before he sits on the spring it is 2 m tall. After he sits on the spring it is only 1.5 m tall. What is the spring constant of the spring?
Sunday, April 10, 2016 by joane

physics
A light spring of constant k = 95.0 N/m is attached vertically to a table (figure (a)). A 2.70-g balloon is filled with helium (density = 0.179 kg/m3) to a volume of 4.00 m3 and is then connected to the spring, causing the spring to stretch as shown in figure (b). Determine ...
Sunday, April 10, 2016 by anna

physics
given the following apparatus; retort stand,stone,thread,spring balance,water,beaker and kerosine.using Archimede's principle, describe a simple experiment on how to determine the density of kerosine.
Sunday, April 10, 2016 by kelechi

physics
A 1.00-kg beaker containing 2.29 kg of oil (density = 916 kg/m3) rests on a scale. A 2.33-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below). Find the equilibrium readings of both scales. top scale N bottom scale N
Sunday, April 10, 2016 by anna

physics
Piston circled 1 in the figure below has a diameter of 0.28 in.; Piston circled 2 has a diameter of 1.6 in. In the absence of friction, determine the force vector F necessary to support the 500-lb weight. in lb i got 1.53 lb but it is incorrect
Sunday, April 10, 2016 by anna

College Physics 1 (Algebra-based)
Calculate the force required of the "deltoid" muscle, Fm, to hold up the outstretched arm shown in the figure below. The total mass of the arm is 3.31kg. Assume that alpha = 15.2°, d = 12.0 cm and D = 24.0 cm. Figure: tinyurl com/hszqaqw Any help (at least how to...
Sunday, April 10, 2016 by collegegirl

PHYSICS!!
Two basketball players collide head on. play a weighs 80 kg and is travelling 2.5m/s to the right while player b weighs 68 kg and is travelling 1.2 m/s to the left. after collision player a is travelling at 1.0 m/s to the right. a. what is the change in momentum of player a? b...
Sunday, April 10, 2016 by tom

Physics CENTER OF MASS
A thin rectangular plate of uniform areal density σ = 2.79 kg/m2 has length of 37.0 cm and width of 23.0 cm. The lower left hand corner is located at the origin, (x,y)= (0,0) and the length is along the x-axis. (a)There is a circular hole of radius 8.00 cm with center at...
Sunday, April 10, 2016 by Jesse

HELP PHYSICS!! WORK
How much work is it to push a box (mass 190 kg) up an incline (angle 16 degrees with the horizontal) that is 8.3 meters long, if the coefficient of kinetic friction between the box and the incline is 0.6?
Sunday, April 10, 2016 by Emma

PHYSICS work on a ramp!!!
How much work is it to push a box (mass 190 kg) up an incline (angle 16 degrees with the horizontal) that is 8.3 meters long, if the coefficient of kinetic friction between the box and the incline is 0.6? My doubt is how do I find force?
Sunday, April 10, 2016 by Matt

Energy of satellite PHYSICS
An m = 43 kg mass instrument package is put into orbit at an altitude above the Earth of A = 23000 km. What is the kinetic energy of this satellite in Joules?
Sunday, April 10, 2016 by Stephanie

PHYSICS CENTER OF MASS
A thin rectangular plate of uniform areal density σ = 2.79 kg/m2 has length of 37.0 cm and width of 23.0 cm. The lower left hand corner is located at the origin, (x,y)= (0,0) and the length is along the x-axis. (a)There is a circular hole of radius 8.00 cm with center at...
Sunday, April 10, 2016 by Nancy

Physics projectile
If a body projected vertically upwards, give a graph showing variation in its kinetic energy
Sunday, April 10, 2016 by Anonymous

Quick Physics help
1. What is the medium for waves on a rope? 2. What is the medium for earthquake waves? 3. A characteristic of waves is that after the wave has passed the medium is (disturbed, undisturbed) is this disturbed? 4. A cork is floating in the water 20 m from the shore of a lake. No ...
Sunday, April 10, 2016 by Anonymous

Physics
A ball is thrown from the ground toward a cliff of height h with a speed of 30.0 m/s and an angle of 60o above horizontal. It lands on the cliff 4.00 s later. How high is the cliff? Answer: 25.5 m But having difficulty getting this answer
Sunday, April 10, 2016 by Sarah

Physics
The amount of radiant power produced by the sun is approximately 3.9 x 1026 W. Assuming the sun to be a perfect blackbody (e = 1) sphere with a radius of 6.96 x 108 m, find its surface temperature (in kelvins).
Sunday, April 10, 2016 by Akeneta

PHYSICS ENERGY CONSERVATION!!
The car shown in the figure has a mass of 395 kg when it passes through point A with a speed of 17.7 m/s, being the height of A 7.2 m above the ground (y = 0). In the instant that passes through C its speed is diminished to 7.6 m/s. Assuming that the path has no friction (a) ...
Sunday, April 10, 2016 by Malcolm

Physics
You take a trip in your car. Starting from rest, you accelerate at 1.00 m/s2 for 10.0 s, heading north. You then stop accelerating and immediately head west at a constant speed for an additional 20.0 s, at which point, you crash into a building coming to an instant stop. At ...
Sunday, April 10, 2016 by sarah

Physics
A 25 kg box is along a horizontal floor and a force of 400 N pushes the box with an angle of 50 degree with the horizontal. Starting from rest, the box achieves a velocity of 2 m/s in a time of 4 seconds. Find the coefficient of sliding friction between the box and the floor. ...
Sunday, April 10, 2016 by Shekinah

physics
A mass m = 0.068 kg of benzene vapor (Lv = 3.94x105 J/kg) at its boiling point of 80.1°C is to be condensed by mixing with water at 45.0°C. What is the minimum mass of water required to condense all of the benzene vapor? Assume the mixing and condensation take place is...
Sunday, April 10, 2016 by jose

physics
A golf ball is hit at a velocity of 30 m/s at an angle of 40˚ from the ground. a.) How high will the golf ball rise? b.) How long will it take for it to hit the ground? c.) How far will it go?
Sunday, April 10, 2016 by suzie

physics
A ball is thrown horizontally from a height of 100 m. It covered a horizontal distance of 3,350 m when it touches the ground. a. What is its horizontal velocity? b. How many seconds after it was fired will it touch the ground? c. What was its vertical velocity when it hits the...
Sunday, April 10, 2016 by suzie

physics
A bullet with a muzzle velocity of 200 m/s is fired horizontally from a rifle mounted on top of a window ledge 7.8 m from the ground. a.) How long will it take to hit the ground? b.) What is the range of the bullet?
Sunday, April 10, 2016 by suzie

physics
Two electrically-charges spheres are suspended from insulated threads a certain distance from each other. There is a certain amount of electrostatic force between them. Describe specifically (not just increase or decrease) what happens to this force in each of the scenarios ...
Saturday, April 9, 2016 by taylor

Physics
An 80 kg hunter gets a rope around a 400 kg polar bear. They are stationary and on frictionless level ice, initially 60 m apart. When the hunter pulls the polar bear to him, the polar bear will move: 1. 10 m 2. 30 m
Saturday, April 9, 2016 by PLS HELP!!

Physics
Please how do i get an answer to this answer that goes like this a wire of length 5.0m and diameter 2.0cm extends by 0.25mm when a force of 50n was used on its end. Calculate (i) stress (ii) strain in the wire (pi=3.142)
Saturday, April 9, 2016 by Manuel

Physics
A bicycle is turned upside down while its owner repairs a flat tire. A friend spins the other wheel and observes that drops of water fly off tangentially. She measures the heights reached by drops moving vertically (see figure below). A drop that breaks loose from the tire on ...
Saturday, April 9, 2016 by A.G.

Physics
Q1. What is the working principle of the loudspeaker. Q2.Explain the following:- 1.Beat 2.Shock wave 3.Mach effect.
Saturday, April 9, 2016 by Jamilu.

physics
Consider air to be a mixture of 80% nitrogen and 20% oxygen. How much work is required to raise the temperature of 7 mol of air by 9 ∘C in an adiabatic process?
Saturday, April 9, 2016 by lizbeth

Physics
the current in an rc circuit if the resistance is 20 ohms the capacitance is 0.002 farad the emr is 12e^-10t
Saturday, April 9, 2016 by fatimaaa

physics
A 58 kg skier has a speed of 9.5 m/s at point A. She then encounters a 1.75 m deep dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m.
Saturday, April 9, 2016 by rocky

physics
The lightbulb in the circuit shown in the figure has a resistance of 14 Ω and consumes 4.2 W of power; the rod is 1.18 m long and moves to the left with a constant speed of 2.9 m/s . The strength of the magnetic field is 2.2 T . Find the current that flows in the circuit...
Friday, April 8, 2016 by jacob

Physics
The isotope, Carbon-14 emits beta radiation and has a half live of 5730 years. How long will it take for the amount of radiation this gives off to drop by a factor of 4?
Friday, April 8, 2016 by Alea

Physics
The total U.S. consumption of electricity in a particular year was 5.0 x 10^12 kilowatt-hours. What is the mass equivalence of this amount of energy? Show all calculations leading to an answer. How would I solve it?
Friday, April 8, 2016 by Alea

physics- help me please
The pressure at the bottom of a glass filled with water (ρ = 1000 kg/m3) is P. The water is poured out and the glass is filled with mercury (ρ = 13.6 ✕ 103 kg/m3). The pressure at the bottom of the glass is now which of the following? a)equal to P b)smaller ...
Friday, April 8, 2016 by anna

physics- help me please
Suppose you have two cubic meters of uranium, four cubic meters of lead, four cubic meters of copper. Rank them by mass, from smallest to largest. a)lead, copper, uranium b)uranium, copper, lead c)copper, uranium, lead d)uranium, lead, copper can someone help me
Friday, April 8, 2016 by anna

physics
What is the maximum walking speed of an adult man whose legs are each 1.2 m long?
Friday, April 8, 2016 by aram

Physics
An object is thrown directly up (positive direction) with a velocity (vo) of 20.0 m/s and do= 0. How high does it rise (v = 0 cm/s at top of rise). Remember, acceleration is -9.80 m/s2.
Friday, April 8, 2016 by emanuel

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