Thursday
May 23, 2013

# Homework Help: Science: Physics

physics
What is the mass of a lead sinker witha volume of 3cm3? please show work I calculated 11.3*3 = 33.9 Is this correct.. Thank you.
Sunday, April 24, 2011 at 7:27pm

physics
Two wires run parallel to each other with currents I1 = -60.3 A, and I2 = 44.1 A. If they are a = 0.12 m apart, what is the magnitude of the force (N) per meter of length? I used the formula (f/L)=Uo(I1)(I2)/(2(pi)(r)) I got 4.43810^-2(N/m)but it was wrong..I'm not sure ...
Sunday, April 24, 2011 at 7:15pm

Pharmacist information
Pharmacists who are trained in the United States must earn a Pharm.D. degree from an accredited college or school of pharmacy. The Pharm.D. degree has replaced the Bachelor of Pharmacy degree, which is no longer being awarded. To be admitted to a Pharm.D. program, an applicant...
Sunday, April 24, 2011 at 7:07pm

physics
What is the mass of a lead sinker witha volume of 3cm3? please show work Thank you
Sunday, April 24, 2011 at 6:57pm

physics
Why would an aneurysm (a widening of an artery) be especially subject to ruputering? I am thinking the pressure is greater than what the artery can handle. How do I express this? Thank you.
Sunday, April 24, 2011 at 6:51pm

physics
With density g/cm3 copper 8.93 silver 10.5 mercury 13.6 will a block of copper or silver float higher in mercury in liquid form? Thank you.
Sunday, April 24, 2011 at 6:47pm

physics
Two identical wooden barrels are fitted with long pipes extending out their tops. The pipe on the first barrell is 1 foot in diameter, an the pipe on the second barrell is only 1/2 inch in diameter. When the larger ptpe is fill with water to a height of 20 feet, the barrell ...
Sunday, April 24, 2011 at 6:36pm

Physics
Let us assume that the muon production happens at an altitude of about 15 kilometers above the surface of the Earth, and that the produced muons have a velocity of 0.99 c. Thus, in the Earth system, it takes the muon approx. 50500 nanoseconds to reach the surface of the Earth...
Sunday, April 24, 2011 at 6:35pm

physics
A roller coaster of mass 1000.0 kg passes point A with a speed of 1.80 m/s? point a= 30m point b= 0m point c= 25m point d= 12m 1. What is the total mechanical energy of the roller coaster at point A? 2. What is the speed of the roller coaster at point B? 3. What is the ...
Sunday, April 24, 2011 at 6:29pm

physics
gold and silver have densities of 19.3 and 10.5 grams per cubic centimer, respectively. If you have eual volumes of each, which one will have the larger mass? I am thinking the gold. how do i prove it? Thank you
Sunday, April 24, 2011 at 6:28pm

physics
The physics of a golf ball and kinetic energy. When a 0.045 kg golf ball takes off after being hit, its speed is 41 m/s. a) What is the kinetic energy of the ball after it has been hit? b) How much work is done on the ball by the club? c) Assume that the force of the club acts...
Sunday, April 24, 2011 at 6:26pm

physics
1. The physics of Mars and its two moons. Mars has two moons, Phobos and Deimos (Fear and Panic, the companions of Mars, the god of war). Deimos has a period of 30 h, 18 min and a mean distance from the centre of Mars of 2.3 x 104 km. If the period of Phobos is 7 h, 39 min, ...
Sunday, April 24, 2011 at 6:23pm

Physics
A radiation worker is subject to a dose of 150 mrad/h of protons for one 40 h work week. How many times the yearly allowable effective dose did she receive?
Sunday, April 24, 2011 at 6:14pm

physics
You can apply enough force to the head of a pushpin to push it into a plaster wall with your thumb. However, it is not a good idea to try to do this with a needle. Use the concept of pressure to explain the differnce betweeen these two situations. Thank you
Sunday, April 24, 2011 at 6:02pm

physics
Oxygen molecules contain two oxygen atoms, and carbon dioxide molecules contain one atom of carbon and two atoms of oxygen. How does the total number of molecules in 1 liter of oxygen compare with the total number of atoms in 1 liter of carbon dioxide if they are both at the ...
Sunday, April 24, 2011 at 5:48pm

physics
A woman with a mass of 65kg climbs a set of stairs that are 3m high. How much gravitational potential energy does she gain? Thank you.
Sunday, April 24, 2011 at 5:30pm

physics
If an 80kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3s, what average power is generated
Sunday, April 24, 2011 at 5:05pm

physics
It is possible to cut the top off a alcohol-in-glass thermometer without any of the alcohol spilling out. However, it will no longer function as a good thermometer. Why not. I am thinking it is a lost pressures issue.
Sunday, April 24, 2011 at 4:45pm

physics
A .095kg aluminum sphere is dropped rom the roof of a 45m building.If 65% of the thermal energy produced when the sphere hits the ground is absorbed by the sphere, what is its temperature change?
Sunday, April 24, 2011 at 4:22pm

physics
Given that 12g of carbon combines completely with 16g of oxygen to form carbon monoxide, how many grams of carbon monoxide can be made from 48g of carbon and 48g of oxygen
Sunday, April 24, 2011 at 4:08pm

physics
rare element very low carbon are composed of symmetrical triangle that have very much, and which are closely linked in the mirror and solid form what can ...
Sunday, April 24, 2011 at 3:08pm

Physics
The Cyclotron lab is not really designed to handle radioactive beams, but Briggsium is too weird to ignore. The physicists propose to generate it in a nuclear reaction immediately behind the accelerators, and are trying to see if they can get the beam all the way to the ...
Sunday, April 24, 2011 at 2:43pm

Physics
A 395cm oscillator has a speed of 104.5cm/s when its displacement is 2.80cm and 74.5cm/s when its displacement is 6.60cm. What is the oscillator's maximum speed?
Sunday, April 24, 2011 at 2:19pm

Physics
A 20 cm long, 180g rod is pivoted at one end. A 17g ball of clay is stuck on the other end. What is the period if the rod and clay swing as a pendulum?
Sunday, April 24, 2011 at 2:15pm

physics
A cube of ice is take from the freezer at -8.5C and placed in a 95g calorimeter aluminum cup containing 310g of water at 20degC. The final situation is observed to be all water at 17degC. What was the mass of the ice cube?
Sunday, April 24, 2011 at 1:45pm

physics
A clock with a pendulum made of steel has a period of 1.000 s at 20.0°C. The temperature is decreased to 4°C. By how much does the period change? How much time does the clock gain or lose in one week?
Sunday, April 24, 2011 at 5:57am

Physics
A 74.5 kg ice skater moving to the right with a velocity of 2.62 m/s throws a 0.21 kg snowball to the right with a velocity of 23.8 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
Sunday, April 24, 2011 at 12:29am

Physics
A 10-kg ladder 2.5m long rests against a frictionless wall with its base on the floor 80cm from the wall. How much force does the top of the ladder exert on the wall?
Saturday, April 23, 2011 at 11:12pm

Physics
Physics Question Help please!!!? A 3.70 kg mass attached to a spring oscillates with a period of 0.375 s and an amplitude of 17.0 cm. (a) Find the total mechanical energy of the system
Saturday, April 23, 2011 at 9:04pm

Physics
Can someone please help me with this physics question? I have most parts of the question answered already. (i only need help with b and c). Thanks The motion of a body is described by the equation 3.50 sin (0.100ðt)where t is in s and y is in m. (a) Find the amplitude 3.50...
Saturday, April 23, 2011 at 9:02pm

Bob Pursley rechecked my question and it was correct if you scan down but he didn't direct me where to find direction of magnetic force on plane and do the pilots have to make corrections to make up for the difference? I'd appreciate any help with that, if possible ...
Saturday, April 23, 2011 at 8:25pm

2 more physics questions I need help on, please?
In which of these situations does more charge flow past a given point on a wire? a. Current of 4 A in 1 min b. Current of 2 A in 0.5 min c. Current of 8 A in 2 min d. All are the same charge I think the answer is C? Since the formula for finding current is 1 = C / s = 1 Ampere...
Saturday, April 23, 2011 at 7:57pm

physics
Determine the force of interaction between 2 electric charges q1= 1x10-6 C and q2= 2x10-6 C at the distance r = 2 m. I think the formula is F=kq1*q2/r2? How do I find k?
Saturday, April 23, 2011 at 7:50pm

Physics
The specific heat capacity of ice is about 0.5 cal/g °C. Calculate the number of calories it would take to change a 4 gram ice cube at absolute zero (-273°C) to 4 gram of boiling water.
Saturday, April 23, 2011 at 6:25pm

physics
How much charge flows through a 12 V battery when a 2 ìC capacitor is connected across its terminal?
Saturday, April 23, 2011 at 5:54pm

Physics
Still stuck...see post at 3:34pm. I don't think I'm understanding the instructions regarding what #'s to use for sin and cos.
Saturday, April 23, 2011 at 5:21pm

Physics
If a aircraft flie at 1000m/s east it accumulates a 50C of charge as it passes a cloud. How would I calculate magnitude of magnetic force, direction of magnetic force on plane and do the pilots have to make corrections to make up for the difference? Thanks in advance for any help
Saturday, April 23, 2011 at 5:04pm

Physics-totally bewildered!!
I have a physics question. This is for extra credit which I really need to earn- If I made a solar cell how would I know which material is best to use if given choices like aluminum with a work function of 4.1eV at a cost of 2.40Kg or platinum with a work function of 6.4 eV at...
Saturday, April 23, 2011 at 5:02pm

physics
What is the period of a simple pendulum that is 2.0 m long in each situation? (b) in an elevator accelerating at 3.0 m/s2 upward (c) in an elevator accelerating 3.0 m/s2 downward
Saturday, April 23, 2011 at 4:37pm

physics
A Foucault pendulum is designed to demonstrate the effect of the Earth's rotation. A Foucault pendulum displayed in a museum is typically quite long, making the effect easier to see. Consider a Foucault pendulum of length 16 m with a 109-kg brass bob. It is set to swing ...
Saturday, April 23, 2011 at 4:13pm

physics
A mass of 12.7 kg is hanging by a steel wire 1.02 m long and 1.12 mm in diameter. If the mass is pulled down slightly and released, what will be the frequency of the resulting oscillations? Young's modulus for steel is 2.0 1011 N/m2.
Saturday, April 23, 2011 at 4:07pm

physics
A mass of 0.394 kg is attached to a spring with a spring constant of 224.2 N/m. Its oscillation is damped, with damping constant b = 14.0 kg/s. What is the angular frequency of this damped oscillation? ω = rad/s
Saturday, April 23, 2011 at 4:06pm

physics
When a mass is attached to a vertical spring, the spring is stretched a distance d. The mass is then pulled down from this position and released. It undergoes 52 oscillations in 28.3 s. What was the distance d?
Saturday, April 23, 2011 at 3:47pm

Physics
Q #2: (only other one I'm stuck on...) A 10-kg ladder 2.5m long rests agaist a frictionless wall with its base on the floor 80cm from the wall. How much force does the top of the ladder exert on the wall? I've found answers to similar questions on this site, but not ...
Saturday, April 23, 2011 at 3:34pm

Physics
A 30-lb weight is attached to one end of a 6-ft uniform beam whose own weight is 20-lb. Where is the balance point? Thanks in advance.
Saturday, April 23, 2011 at 3:32pm

physics
does the frequency of light influences how it is reflected
Saturday, April 23, 2011 at 1:27pm

physics
A satellite of mass m in a circular orbit at a height of 400Km above the earth's surface. What is the Radius of the Earth (given: 6.35 * 10^6) with respect to the center C of the Earth?
Saturday, April 23, 2011 at 11:41am

physics
a stone is from the top of a tower 300m high and at the same time another stone is projected vertically upward with initial velocity 75m/s. calculate when and where the two stone meet
Saturday, April 23, 2011 at 3:28am

physics
In LCR series AC circuit when does the effective voltage lag behind the current?
Friday, April 22, 2011 at 4:17pm

physics
when the pressure is more on the ground ---- when a man is walking or when a man is standing.
Friday, April 22, 2011 at 4:10pm

physics
What will be the equilibrium temperature when a 245g block of copper at 285 degrees C is placed in a 145g calorimeter aluminum cup containing 825g of water at 12 C ?
Friday, April 22, 2011 at 3:46pm

physics - rotational motion
A small car of mass, m, is release at height, h, on a steel track. the car rolls down the track and through the loop of radius, R. at the end of the rack, the car rolls off the track, which is positioned at height, H, above the floor. neglect friction and the small amount of ...
Friday, April 22, 2011 at 2:50pm

physics
With what tension must a rope with length 2.70 and mass 0.150 be stretched for transverse waves of frequency 43.0 to have a wavelength of 0.850 ?
Friday, April 22, 2011 at 1:59pm

physics
How much heat in KJ is needed to change 3.0 kg of ice at -10C into (superheated) steam at +150C ? Do I need to find specific heat? (3.0kg)(2100)(150-10)= 882kj right?
Friday, April 22, 2011 at 1:20pm

Physics
A 100-kg box is suspended from two ropes; the left one makes an angle of 20degrees with the vertical, and the other makes an angle of 40degrees. What is the tension in each rope. I think I've got the basics: I have Fx=T1(x) + T2(x)= 0 to calc the first tension, and Fy= T1(...
Friday, April 22, 2011 at 9:35am

Physics
A block of mass 5kg is lifted 2m in 3sec. Find the work done.
Friday, April 22, 2011 at 8:42am

physics
The temperature of 4.60 mol of an ideal monatomic gas is raised 15.0 K in an adiabatic process. What are (a) the work W done by the gas, (b) the energy transferred as heat Q, (c) the change ΔEint in internal energy of the gas, and (d) the change ΔK in the average ...
Friday, April 22, 2011 at 7:25am

physics
An ideal monatomic gas initially has a temperature of 338 K and a pressure of 6.96 atm. It is to expand from volume 435 cm3 to volume 1310 cm3. If the expansion is isothermal, what are (a) the final pressure (in atm) and (b) the work done by the gas? If, instead, the expansion...
Friday, April 22, 2011 at 6:37am

physics
A glass window pane is exactly 23 cm by 38 cm at 10oC. By how much has its area increased when it temperature is 49oC, assuming that it can expand freely? Take the coefficient of thermal expansion for the glass to be exactly 9 x 10-6/Co
Friday, April 22, 2011 at 6:35am

physics
the tension in the wire is decreased by 19%. The percentage decrease in the frequency will be?
Friday, April 22, 2011 at 5:33am

Physics
Some cooking pan whose bottom is made out of copper has a radius 0.1 m and thickness 0.003 m. The water in the pan boils at 1.7e-3 kg/s. How much higher is temperature of the outside surface of the pan's bottom compared to the inside surface?
Friday, April 22, 2011 at 3:34am

Physics
A 30-lb weight is attached to one end of a 6-ft uniform beam whose own weight is 20-lb. Where is the balance point of the system? I know the answer is "1.2 ft from the 30-lb weight" but I can't figure out how to get there. Please help. Thanks...
Friday, April 22, 2011 at 12:54am

physics
A car initially going 30ft/sec brakes at a constant rate (constant negative acceleration) coming to a stop in 4 seconds. How far did the car travel?
Thursday, April 21, 2011 at 9:00pm

physics
The temperature of 4.60 mol of an ideal monatomic gas is raised 15.0 K in an adiabatic process. What are (a) the work W done by the gas, (b) the energy transferred as heat Q, (c) the change ΔEint in internal energy of the gas, and (d) the change ΔK in the average ...
Thursday, April 21, 2011 at 7:22pm

physics
An ideal monatomic gas initially has a temperature of 338 K and a pressure of 6.96 atm. It is to expand from volume 435 cm3 to volume 1310 cm3. If the expansion is isothermal, what are (a) the final pressure (in atm) and (b) the work done by the gas? If, instead, the expansion...
Thursday, April 21, 2011 at 7:21pm

physics
A glass window pane is exactly 23 cm by 38 cm at 10oC. By how much has its area increased when it temperature is 49oC, assuming that it can expand freely? Take the coefficient of thermal expansion for the glass to be exactly 9 x 10-6/Co
Thursday, April 21, 2011 at 7:21pm

Physics
1). A hot iron horseshoe (mass=.40kg), just forged, is dropped into 1.35L of water in a .30kg iron pot initially at 20.0 degrees Celsius. If the final equilibrium temperature is 25.0 degrees Celsius, estimate the initial temperature of the hot horseshoe. 2). A cube of ice is ...
Thursday, April 21, 2011 at 5:42pm

physics
There is a problem that asks if an ice cube is dropped into nitrogen (boiling point of nitrogen is 77K), how much nitrogen will evaporate? heat lost by ice = heat gained by nitrogen But by is the equation m(ice)*c(ice)*deltaT = m(nitrogen)*L(vaporation) ? Why isn't it m(...
Thursday, April 21, 2011 at 5:09pm

physics
How will changing the frequency of the wave affect the wave speed?
Thursday, April 21, 2011 at 4:07pm

physics
How will changing the amplitude of the wave affect the wave speed?
Thursday, April 21, 2011 at 4:07pm

physics
A block of mass M connected to an untstretched horizontal spring of spring constant k is hit by a bullet of mass m which has a velocity V just before the collision. The bullet stays in the block. The coefficient of friction between the block and surface is b. Explain how do ...
Thursday, April 21, 2011 at 3:39pm

physics
If a burning log is a black object with a surface area of 0.35 m2 and a temperature of 800 ¢ªC, how much power does it emit as thermal radiation?
Thursday, April 21, 2011 at 2:22pm

Physics
I've been stuck on this problem for a while. Im not sure where to even begin. A bike wheel is rotating with an angular velocity of 3.1 rev/s. If the coefficient of kinetic friction between the wheel and brakes is .87, then find the revolutions the wheel makes in coming to ...
Thursday, April 21, 2011 at 1:39pm

physics
A beam of light is emitted in a pool of water from a depth of 64.0 cm. How far away, relative to the spot directly above it, must it strike the air-water interface in order that the light does not exit the water?
Thursday, April 21, 2011 at 12:44pm

physics
the density of a block of wood with a colume of 50 cubic centimeters and a mass of 10o grams is
Thursday, April 21, 2011 at 12:16pm

Integrated Physics and Chemistry
In an internal combustion engine, the gas vapor/air mixture enters the cylinder during the ____ stroke. A)intake B)compression C)power D)exhaust
Thursday, April 21, 2011 at 10:31am

Integrated Physics and Chemistry
The specific heat capacity of copper is 0.09 cal/g°C. How much energy is needed to flow into a 10-gram sample to change its temperature from 20°C to 21°C? A)0.009 cal B)0.09 cal C)0.9 cal D)9 cal
Thursday, April 21, 2011 at 10:29am

Integrated Physics and Chemistry
A wooden walkway and a sandy beach are at the same temperature. The sand feels much hotter because it has a greater ____. A)entropy B)insulation capacity C)suface area D)thermal conductivity
Thursday, April 21, 2011 at 10:26am

Integrated Physics and Chemistry
If the kinetic energy of a sample increases, the ____ will also increase. A)potential energy B)temperature C)chemical energy D)nuclear energy
Thursday, April 21, 2011 at 10:16am

Integrated Physics and Chemistry
Which of the following would by the best conductor of heat energy? A)a plastic spoon B)a wooden spoon C)a metal spoon
Thursday, April 21, 2011 at 10:14am

Integrated Physics and Chemistry
Matching... 1.)zeroth 2.)first 3.)second -heat can change energy from one form to another, but the amount of energy in the universe is constant. -two objects in thermal equilibrium will have no net heat flow between them. -the tendency of the universe is to increase entropy.
Thursday, April 21, 2011 at 10:12am

physics
The temperature of 4.60 mol of an ideal monatomic gas is raised 15.0 K in an adiabatic process. What are (a) the work W done by the gas, (b) the energy transferred as heat Q, (c) the change ΔEint in internal energy of the gas, and (d) the change ΔK in the average ...
Thursday, April 21, 2011 at 10:09am

physics
An ideal monatomic gas initially has a temperature of 338 K and a pressure of 6.96 atm. It is to expand from volume 435 cm3 to volume 1310 cm3. If the expansion is isothermal, what are (a) the final pressure (in atm) and (b) the work done by the gas? If, instead, the expansion...
Thursday, April 21, 2011 at 10:08am

Integrated Physics and Chemistry
A furnace is used to heat ___ A)water B)air C)a refrigerant D)radiant coils
Thursday, April 21, 2011 at 10:08am

Integrated Physics and Chemistry
Some refrigerants used in air conditioners have been associated with... A)smog B)destruction of the ozone layer C)thermal pollution D)power failures
Thursday, April 21, 2011 at 10:06am

Integrated Physics and Chemistry
Insulating materials are rated by their.. A)specific heat B)heat index C)R-value D)temperature resistance
Thursday, April 21, 2011 at 10:03am

physics
a stone is from the top of a tower 300m high and at the same time another stone is projected vertically upward with initial velocity 75m/s. calculate when and where the two stone meet
Thursday, April 21, 2011 at 9:53am

physics
The 4.00-kg block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended towards the rod and each have a length of 1.25. The length from the upper string and lower string on the rod is 2...
Thursday, April 21, 2011 at 5:30am

physics
Believe it or not, a plumb-bob does not hang exactly along a line directed to the centre of the Earth! Determine how far off true plumb a bob hangs in Cape Town. In which direction is the deviation (north, east, south, or west)? How would your answer differ for a plumb-bob in ...
Thursday, April 21, 2011 at 5:16am

physics
How much heat in KJ is needed to change 3.0 kg of ice at -10C into (superheated) steam at +150C ?
Thursday, April 21, 2011 at 12:39am

The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four railway cars having a ...
Wednesday, April 20, 2011 at 11:35pm

physics
An 85.4 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 22.4 m behind the ship, at rest relative to the spaceship. The only way to return to ...
Wednesday, April 20, 2011 at 8:45pm

Physics
Two billiard balls with identical masses and sliding in opposite directions have an elastic head-on collision. Before the collision, each ball has a speed of 20 cm/s. Find the speed of each billiard ball immediately after the collision.
Wednesday, April 20, 2011 at 8:41pm

physics
Which phase of matter consists of particles that are locked into place and unable to move past each other?
Wednesday, April 20, 2011 at 6:06pm

physics
Search: The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.029 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.049 kg and is initially at rest. After the ...
Wednesday, April 20, 2011 at 4:26pm

physics
Search: The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.029 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.049 kg and is initially at rest. After the ...
Wednesday, April 20, 2011 at 4:25pm

physics
Search: The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.029 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.049 kg and is initially at rest. After the ...
Wednesday, April 20, 2011 at 4:25pm

physics
A 5.0-kg block at rest on a frictionless surface is acted on by forces F1 = 5.5 N and F2 = 3.5 N. What additional horizontal force will keep the block at rest? Answer: F3 = (-7.6 N)
Wednesday, April 20, 2011 at 2:02pm

physics
A stone is thrown vertically upwards with a velocity 30 ms −1 . If the acceleration due to gravity is 10 ms −2 , what is the distance travelled by the particle during the first second of its motion?
Wednesday, April 20, 2011 at 12:07pm

Physics
The engine of a train has a mass of 5x10^4 kg. it can accelerate six railway cars having a total mass of 3x10^5 kg by 0.4 m/s^2 (the 6 railway cars have a combined mass of 3x10^5). what acceleration can the same engine using the same force give to four railway cars having a ...
Wednesday, April 20, 2011 at 9:55am

PHYSICS
A thin 2.82 m long copper rod in a uniform magnetic field has a mass of 44.2 g. When the rod carries a current of 0.238 A, it floats in the magnetic field. The acceleration of gravity is 9.81 m/s2 . What is the field strength of the magnetic field? Answer in units of T.
Tuesday, April 19, 2011 at 10:10pm

physics
An electron in an electron beam experiences a downward force of 1.9×10^−14 N while traveling in a magnetic field of 6.4 × 10^−2 T west. The charge on a proton is 1.60×10^−19. a) What is the magnitude of the velocity? b) What is its direction?
Tuesday, April 19, 2011 at 10:09pm

physics
A proton moves perpendicularly to a mag- netic field that has a magnitude of 3.09×10^−2 T. The charge on a proton is 1.60×10−19 C. What is the speed of the particle if the magnitude of the magnetic force on it is 3.50*10^−14N? Answer in units of m/s.
Tuesday, April 19, 2011 at 10:08pm

physics
How high does a rocket have to go above Earth's surface until its weight is one fourth what it would be on Earth?
Tuesday, April 19, 2011 at 9:44pm

College Physics
I'm asked to find the shortest wavelength photon emitted for the paschen series for the hydrogen atom. I used the Rydberg equation and substituted the appropriate values. Frequency= Rh(1/3^2)-(1/infinity^2) I get an answer of 820 nm. My online homework program said this ...
Tuesday, April 19, 2011 at 9:39pm

Physics
A hydrogen atom initially in its ground state (n = 1) absorbs a photon and ends up in the state for which n = 3. What is the energy of the absorbed photon? *I found the energy of the atom at the ground state and at n = 3. I subtracted the final from the initial to get a value ...
Tuesday, April 19, 2011 at 9:14pm

PHYSICS
Sally Sue, an enthusiastic physics student enjoyed the opportunity to collect data from standing waves in a spring. She and her partner help the ends of their spring 4.00 meters apart. There are 5 nodes in the standing wave produced. Sally moved her hand from the rest position...
Tuesday, April 19, 2011 at 9:01pm

physics
find the speed and period of a satellite that would orbit Mars 203 km above its surface.
Tuesday, April 19, 2011 at 8:56pm

I need help with two questions: 1) An object can only have a charge that is an integral multiple of the charge on the ___. Am I correct with "electron" as the answer? or possibly elementary charge? 2) The difference in potential between any two points in a field is ...
Tuesday, April 19, 2011 at 7:52pm

physics
A storage tank at stp contains 18.5kg of nitrogen. What is the volume of the tank and what would the pressure be if you added another 15kg of nitrogen at the same temperature?
Tuesday, April 19, 2011 at 6:51pm

Physics
A motorcycle with a mass of 350 kg is accelerated from rest to a velocity of 30 m/s by a force of 4000 N. calculate the distance over which this acceleration occurred.
Tuesday, April 19, 2011 at 5:17pm

Physics
How do I solve this question: What is the resistance of a laptop computer that has an 11V battery & requires 15W of power?
Tuesday, April 19, 2011 at 4:50pm

physics
A teenager pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 12 in 9.0 . Assume the merry-go-round is a uniform disk of radius 2.2 and has a mass of 650 , and two children (each with a mass of 29 ) sit opposite ...
Tuesday, April 19, 2011 at 4:32pm

physics
The bolts on the cylinder head of an engine require tightening to a torque of 63 . If the six-sided bolt head is 15 in diameter, estimate the force applied near each of the six points by a socket wrench.
Tuesday, April 19, 2011 at 4:23pm

physics
An airplane flies 200 km due west from city A to city B and then 245 km in the direction of 31.5° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A?
Tuesday, April 19, 2011 at 4:18pm

physics
A small rubber wheel is used to drive a large pottery wheel, and they are mounted so that their circular edges touch. The small wheel has a radius of 1.8 and accelerates at the rate of 7.0 , and it is in contact with the pottery wheel (radius 30.0 ) without slipping. Calculate...
Tuesday, April 19, 2011 at 4:08pm

physics
You are standing at a spot where the magnetic field of the Earth is horizontal, points due northward, and has magnitude 36.9 μT. Directly above your head, at a height of 12.3 m, a long, horizontal cable carries a steady DC current of 381 A due northward. Calculate the ...
Tuesday, April 19, 2011 at 2:29pm

physics
You are standing at a spot where the magnetic field of the Earth is horizontal, points due northward, and has magnitude 36.9 μT. Directly above your head, at a height of 12.3 m, a long, horizontal cable carries a steady DC current of 381 A due northward. Calculate the ...
Tuesday, April 19, 2011 at 2:28pm

physics
Two 173 turn coils, each with a diameter of d = 4.45 m, are placed w = 1.31 m apart, as shown in the figure. A current of 6.99 A is flowing in the wires of both coils; the direction of the current is clockwise for both coils when viewed from the left. What is the magnitude of ...
Tuesday, April 19, 2011 at 1:53pm

physics
You are standing at a spot where the magnetic field of the Earth is horizontal, points due northward, and has magnitude 36.9 μT. Directly above your head, at a height of 12.3 m, a long, horizontal cable carries a steady DC current of 381 A due northward. Calculate the ...
Tuesday, April 19, 2011 at 1:52pm

physics
A dish of hot food has an emissivity of 0.42 and emits 15 W of thermal radiation. If you wrap it in aluminum foil, which has an emissivity of 0.06, how much power will it radiate?
Tuesday, April 19, 2011 at 1:20pm

physics
A centrifuge accelerates uniformly from rest to 18000 rpm in 180 s. Through how many revolutions did it turn in this time?
Tuesday, April 19, 2011 at 12:39pm

physics
A grinding wheel 0.28 m in diameter rotates at 2400 rpm. What is the acceleration of a point on the edge of the grinding wheel?
Tuesday, April 19, 2011 at 12:35pm

Physics
A ray of light of frequency is 5.09 x 10^14 Hz is traveling from water to medium X. The angle of incidence in water is 45 degrees and the angle of refraction in Medium X is 29 degrees. The index of refraction of Medium X is 1.94. Calculate the wavelength for each medium. What ...
Tuesday, April 19, 2011 at 12:28pm

physics
a 2 kg object is released from rest from a height of 10 m above the ground.calculate the kinetic energy at the moment it reaches 4 m above the ground with potential energy 200J
Tuesday, April 19, 2011 at 12:24pm

Maths and Physics
Law of Gravitation- Find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is neglected. The gravitational constant for g is, G = 6.67428*10^-11 m^3 Kg^-1 s^-2 (10 marks). Kind Regards
Tuesday, April 19, 2011 at 10:19am

Integrated Physics and Chemistry
The internal energy of a material is determined by.. A)its temperature B)the kinetic energy of its molecules C)the potential energy of its molecules D)the combined amount of kinetic and potential energy of its molecules
Tuesday, April 19, 2011 at 10:05am

Integrated Physics and Chemistry
Matching... Heat engine Heat pump Boiler Thermostat -a heating appliance that uses heat energy released from fossil fuels to warm water for use in radiant or convection heating systems -a appliacne that controls the maintenance temperature of a heating system -an appliance ...
Tuesday, April 19, 2011 at 10:02am

Integrated Physics and Chemistry
A thermostat is used for which of the following? A) Maintaining the temperature is a room B)Turning a heating system on C)Turning a heating system off D)All of the above
Tuesday, April 19, 2011 at 9:55am

physics
The third longest wavelength in the Paschen series in hydrogen corresponds to what transitions?
Tuesday, April 19, 2011 at 7:37am

physics
Calculate the ionization energy of doubly ionized Lithium, which has Z=3. Construct also the energy level diagram for it.
Tuesday, April 19, 2011 at 7:37am

physics
Evaluate the Rydberg constant R using Bohr theory and show that its value is R = 1.0974x10-1.
Tuesday, April 19, 2011 at 7:36am

physics
In the Sun, an ionized helium atom makes a transition from n =6 state to the n = 2 state, emitting a photon. Can that photon be absorbed by hydrogen atoms present in the Sun? If so between what energy states will the hydrogen atom jump?
Tuesday, April 19, 2011 at 7:36am

physics
Explain what ideas led Bohr to suggest a new atomic model; and state Bohr postulates. Explain also, in words, what the correspondence principle is in atomic physics.
Tuesday, April 19, 2011 at 7:35am

physics
A box is placed on top of another box,if it is exerting a compressive force of 500N.What is the approximate weight of the box?
Tuesday, April 19, 2011 at 3:59am

physics
The resultant of two forces acting on the same point simultaneously will be the greatest when the angle between them is 180⁰ 45⁰ 0⁰ 90⁰
Tuesday, April 19, 2011 at 2:56am

physics
If Fx = Fy then the angle è which the vector F makes with the horizontal is of 0⁰ 45⁰ 90⁰ 180⁰
Tuesday, April 19, 2011 at 2:55am

physics
A man moves along a semi-circle. What is the relation between distance covered (S) by him and his displacement (D)? S = D S > D S < D
Tuesday, April 19, 2011 at 2:50am

physics
How much power is used by a 50Kg athlete in climbing a 10m high ladder in 9.8 sec? 1000 J 2000 J 3000 J 4000 J
Tuesday, April 19, 2011 at 2:48am

physics
The weight of an object on the moon is one-sixth of its weight on the Earth. The ratio of the kinetic energy of a body on the Earth moving with speed V to that of the same body moving with speed V on the moon is:
Tuesday, April 19, 2011 at 2:40am

physics
A thin 2.82 m long copper rod in a uniform magnetic field has a mass of 44.2 g. When the rod carries a current of 0.238 A, it floats in the magnetic field. The acceleration of gravity is 9.81 m/s2 . What is the field strength of the magnetic field? Answer in units of T.
Tuesday, April 19, 2011 at 12:16am

physics
A proton moves perpendicularly to a mag- netic field that has a magnitude of 3.09×10^−2 T. The charge on a proton is 1.60×10−19 C. What is the speed of the particle if the magnitude of the magnetic force on it is 3.50*10^−14N? Answer in units of m/s.
Tuesday, April 19, 2011 at 12:15am

physics
An electron in an electron beam experiences a downward force of 1.9×10^−14 N while traveling in a magnetic field of 6.4 × 10^−2 T west. The charge on a proton is 1.60×10−19. a) What is the magnitude of the velocity? b) What is its direction?
Tuesday, April 19, 2011 at 12:13am

Physics
A cylinder of oxygen has a gauge pressure of 2000psi and a volume of 16L at 70 degrees F. If the oxygen is used as a constant flow rate of 2 L/minute, measured at 1 atm of pressure, how long will the tank last? Hint: Calculate the mass (grams) of oxygen in the tank and the ...
Tuesday, April 19, 2011 at 12:04am

Physics
A transformer has 3000 loops in its primary coil and 1500 loops in its secondary coil. What is the voltage in the secondary coil if the voltage in the primary coil is 120 V??? ***PLEASE explain how you get the answer*** thank you:)
Monday, April 18, 2011 at 11:55pm

Physics
A cylinder of oxygen has a gauge pressure of 2000psi and a volume of 16L at 70 degrees F. If the oxygen is used as a constant flow rate of 2 L/minute, measured at 1 atm of pressure, how long will the tank last? Hint: Calculate the mass (grams) of oxygen in the tank and the ...
Monday, April 18, 2011 at 11:18pm

physics
If a coffee can has a radius of 63.0 cm and a height of 15.8 cm find its volume round to neaerest cm3
Monday, April 18, 2011 at 10:49pm

Physics
An escalator in a department store is driven by a large electric motor whose power consumption changes with the load to keep the escalator moving at a constance velocity, up to a certain maximum power capacity. An escalator working at 0.22 of its maximum power capacity lifts ...
Monday, April 18, 2011 at 10:36pm

Physics
Much of the time and expense in drilling an oil well goes into changing the drill bit as it wears out. the drilling pipe must be pulled up and disassembled one section at a time in order to pull the drill bit out of the hole and replace it. A pipe 0.65 miles long weighs 2,400 ...
Monday, April 18, 2011 at 10:32pm

Physics
A small boy is flipping a piece of cake across the lunch room at school. He uses a fork as a catapult by holding the handle on the table and pressing on the back of it with his thumb. Only part of the energy delivered to the fork goes into the accelerating the cake, however, ...
Monday, April 18, 2011 at 10:29pm

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