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December 19, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
a body of mass 5kg initially at rest is subjected to a force of 20N. find the kinetic energy acquired by the body at the end of 10s.
Wednesday, January 16, 2013 at 10:12am

physics
define 1watt of power . a lamp consumes 1000J of electrical energy in 10s calculate its power.
Wednesday, January 16, 2013 at 10:09am

physics
An observer rides with a moving sound source directly toward a large vertical wall. The vehicle has a constant speed of 10m/s and the source has a frequency of 150Hz. What beat frequency is heard by the observer as a result of the combination of the direct and reflected sounds?
Wednesday, January 16, 2013 at 7:34am

Physics
How many joules would be required to raise the temperature of 20g of ice at oC to water at15C?
Wednesday, January 16, 2013 at 12:35am

Physics
The patient in the figure below is to receive an intravenous injection of medication. In order to work properly, the pressure of fluid containing the medication must be 108 kPa at the injection point. (a) If the fluid has a density of 1024 kg/m3, find the height at which the ...
Tuesday, January 15, 2013 at 11:39pm

Physics
When a 1.53-kilogram mass is placed on a spring with a spring constant of 30.0 newtons per meter, the spring is compressed 0.500 meter. How much energy is stored in the spring?
Tuesday, January 15, 2013 at 11:25pm

Physics
A car traveling at 20 m/s accelerates at 7 m/s2 for 3 sec. How fast is it now traveling? Please help!
Tuesday, January 15, 2013 at 11:17pm

Physics
Three point charges are on the x axis: −6 µC at −3 m, 7 µC at the origin, and −5 µC at 3 m. Find the force on the first charge. The value of the Coulomb constant is 8.98755 × 10^9 N · m^2/C^2.
Tuesday, January 15, 2013 at 10:41pm

Physics
A 2563-kg van runs into the back of a 826-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road is negligible, calculate the initial speed of the van.
Tuesday, January 15, 2013 at 10:40pm

physics
A point charge of +1 µC is located at x = −2 cm and a second point charge of −8 µC is located at x = 6 cm. Where should a third charge of +1 µC be placed so that the electric field at x = 0 cm is zero?
Tuesday, January 15, 2013 at 10:22pm

Physics
You need to move a 128-kg sofa to a different location in the room. It takes a force of 99 N to start it moving. What is the coefficient of static friction between the sofa and the carpet?
Tuesday, January 15, 2013 at 10:15pm

PHYSICS
When a 1.53-kilogram mass is placed on a spring with a spring constant of 30.0 newtons per meter, the spring is compressed 0.500 meter. How much energy is stored in the spring?
Tuesday, January 15, 2013 at 10:06pm

Physics
When a 1.53-kilogram mass is placed on a spring with a spring constant of 30.0 newtons per meter, the spring is compressed 0.500 meter. How much energy is stored in the spring?
Tuesday, January 15, 2013 at 9:09pm

Physics!
A 0.3 kg brick is dropped form a height of 8 meters. It hits the ground and comes to rest. a) Calculate the impulse exerted by ground on the brick. b) It takes 0.0013 seconds from the time the brick first touches the ground until it touches the ground. Calculate the average ...
Tuesday, January 15, 2013 at 8:57pm

physics
A car with a mass of 3200 kg and a velocity of 50 m/s brakes to a final velocity of 25m/s in a distance of 85 m. what is the force the brakes apply to stop the car.
Tuesday, January 15, 2013 at 8:54pm

physics
A narrow beam of light passes through a plate of glass with thickness 1.4 cm and a refractive index 1.55. The beam enters from air at an angle 23.5 . The goal is to calculate the deviation d of the ray as indicated in the figure.
Tuesday, January 15, 2013 at 8:50pm

AP Physics B
Part 2!!!! An object weighing 305 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 270 N . Immersed in oil, the object appears to weigh 279 N . Find the density of the object. Answer in units of kg/m3
Tuesday, January 15, 2013 at 8:36pm

AP Physics B
An empty rubber balloon has a mass of 0.01 kg . The balloon is filled with helium at a density of 0.181 kg/m3 . At this density the balloon has a radius of 0.493 m . If the filled balloon is fastened to a vertical line, what is the tension in the line? The ...
Tuesday, January 15, 2013 at 8:34pm

AP Physics B
A 1.2 kg rectangular air mattress is 2.1 m long, 0.46 m wide, and 0.09 m thick. If it has a mass of 1.2 kg , what additional mass can it support in water?
Tuesday, January 15, 2013 at 8:32pm

AP Physics B
I have one our part question left that I just don't understand! Please help me!! Part 1 An 11.6 kg block of metal is suspended from a scale and immersed in water as in the figure. The dimensions of the block are 12.9 cm × 9.7 cm × 9.7 cm. The 12.9 cm ...
Tuesday, January 15, 2013 at 8:30pm

physics
A solid nonconducting sphere of radius 13 cm has a positive charge 9.8 × 10-8 C spread uniformly throughout its volume. The electric field at a point within the sphere at a radius 5.0 cm has a magnitude of
Tuesday, January 15, 2013 at 8:27pm

physics
The Amy Anhasier family began a vacation trip by driving 700 km west.Then the family drives 600km south,300 km east,and 400km,.Where willthe Amy end up in relation to their starting point?
Tuesday, January 15, 2013 at 5:12pm

physics
the magnitude of the tongue produced by a 3.0n force applied to a door at a perpendicular distance of 0.25 m from the hinge
Tuesday, January 15, 2013 at 2:04pm

physics
a 57 g of copper is at 12 degrees celsius, if 1012 J of energy is added to the copper, what is the final temperature of the copper?
Tuesday, January 15, 2013 at 2:02pm

Help me!, Physics
A 60g piece of ice at an intial temperature that is unknown is placed into a glass of 250g of water sitting at room temperature when it is 80 degrees F in the room. The glass and ice come up thermal equilibrium at 4 degrees Celsius. What is the original temperature of the ...
Tuesday, January 15, 2013 at 1:35pm

Help! Desperate, physics
a 40 kg child slides down a frictionless playground slide from a height of 2.0m. What is her speed at the bottom of the slide? Would the answer to part A change if she jumped straight down instead of sliding? How would the answer to part A change if the slide were not ...
Tuesday, January 15, 2013 at 12:24pm

Physics, help me!
On a curved roadway of radius 100m, the suggested speed is 35mph(approximately 16m/s). What must the coefficient of friction be between a car's tires and the road for the car to safely negotiate the curve at the posted speed?
Tuesday, January 15, 2013 at 11:55am

Physics
A bat emits a sound whose frequency is 83.2 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 40.5 oC, so the speed of sound is not 343 m/s. Assume that air behaves like an ideal gas, and find the wavelength of the sound.
Tuesday, January 15, 2013 at 11:38am

Physics
1. How does displacement change with time for a falling object? How might you describe the mathematical relationship between the distance and time of a falling object?
Tuesday, January 15, 2013 at 11:12am

physics
A small ball is thrown vertically upwards with an initial velocity of 40m/s. Find:(1) its velocity after moving 3 seconds(2) the maximum heigh attained(3) the time to attain the maximum height(4)the total time taken for the ball to return to the ground again
Tuesday, January 15, 2013 at 10:49am

physics
A small ball is thrown vertically upwards with an initial velocity of 40m/s. Find:(1) its velocity after moving 3 seconds(2) the maximum heigh attained(3) the time to attain the maximum height(4)the total time taken for the ball to return to the ground again
Tuesday, January 15, 2013 at 10:49am

Physics
1. How does displacement change with time for a falling object? How might you describe the mathematical relationship between the distance and time of a falling object? Explain the answer using your data, graphs, and kinematic equations.
Tuesday, January 15, 2013 at 10:36am

Physics
What force is needed to give a 0.25-kg arrow an acceleration of 196 m/s2? A. 0.25 N B. 49 N C. 196 N D. 748 N
Tuesday, January 15, 2013 at 10:16am

physics
When an air capacitor with a capacitance of 400 (1 = ) is connected to a power supply, the energy stored in the capacitor is 2.05×10−5 . While the capacitor is kept connected to the power supply, a slab of dielectric is inserted that completely fills the space ...
Tuesday, January 15, 2013 at 8:16am

physics
When an air capacitor with a capacitance of 400 (1 = ) is connected to a power supply, the energy stored in the capacitor is 2.05×10−5 . While the capacitor is kept connected to the power supply, a slab of dielectric is inserted that completely fills the space ...
Tuesday, January 15, 2013 at 8:13am

physics
how far (in meters) will you travel in 3.0 minutes running at 6.0 m/s?
Monday, January 14, 2013 at 11:50pm

physics
a 57 g of copper is at 12 degrees celsius, if 1012 J of energy is added to the copper, what is the final temperature of the copper?
Monday, January 14, 2013 at 11:01pm

physics
2. A car accelerates uniformly from +10.0 m/s to +40.0 m/s over a distance of 125 m. How long did it take to go that distance? Show all your work, including the equation used, given and unknown quantities, and any algebra required. Make sure your answer has the correct number ...
Monday, January 14, 2013 at 10:04pm

Physics conceptual questions
You have a drink that you want to cool off? You could put in 100 g of ice or 100 g of water, both at 0 degree C. Which one would be more effective in cooling your drink? Why?
Monday, January 14, 2013 at 10:03pm

Physics to be solved
a horizontal scaffold, of length 2.00 m and uniform mass 50.0 kg, is suspended from a building by two cables. The scaffold has dozens of paint cans stacked on it at various points. The total mass of the paint cans is 79.5 kg. The tension in the cable at the right is 837 N. How...
Monday, January 14, 2013 at 9:59pm

Physics
The driver of a car on a horizontal road makes an emergency stop by applying the brakes so that all four wheels lock and skid along the road. The coefficient of kinetic friction between tires and road is 0.39. The separation between the front and rear axles is L = 4.1 m, and ...
Monday, January 14, 2013 at 9:52pm

Physics
A gas is confined in a 0.47-m-diameter cylinder by a piston, on which rests a weight. The mass of the piston and weight together is 150 kg. The atmospheric pressure is 101 kPa. (a)What is the force (in Nt) exerted on the gas by the piston, the weight and the atmosphere ...
Monday, January 14, 2013 at 9:28pm

physics
a person lifts a 4.3 kg centimeter block a vertical distance of 1.10m. and then carries the block horizontally a distance of 10.0m. How much work is done by the person? How much work is done by gravity?
Monday, January 14, 2013 at 9:19pm

physics
a person lifts a 4.3 kg centimeter block a vertical distance of 1.10m. and then carries the block horizontally a distance of 10.0m. How much work is done by the person? How much work is done by gravity?
Monday, January 14, 2013 at 9:18pm

physics
Before a collision, a 27 kg object is moving at +11 m/s. Find the impulse that acted on the object if, after the collision, it moved at the following velocities. a. 8 m/s b. -8m/s
Monday, January 14, 2013 at 8:31pm

PLEASE HELP ME IN THIS PHYSICS PROBLEM
A heat transfer of 9.5 x 10^5 J is required to convert a block of ice at -15°C to water at 15°C. What is the mass of the block of ice?
Monday, January 14, 2013 at 7:05pm

Physics
A carnival ferris wheel completes five turns about its horizontal axis every minute. What is the acceleration of a passenger at his/ her lowest point on the ride? I understand that 1/f= T which is how you find the period and that minutes must be converted to sec, but I'm ...
Monday, January 14, 2013 at 6:52pm

Physics
Hi. I am Walter White. I am good at chemistry but suck at physics. Can you help me? ----------------------------------------​ Bob is traveling in a very fast space (v=0.8c) away from Alice, who is sitting still in an observatory watching him through a very good telescope...
Monday, January 14, 2013 at 6:44pm

Physics
A carnival ferris wheel completes five turns about its horizontal axis every minute. What is the acceleration of a passenger at his/ her lowest point on the ride? I understand that 1/f= T which is how you find the period and that minutes must be converted to sec, but I'm ...
Monday, January 14, 2013 at 5:19pm

Physics
A diver (mass = 75.0 kg) walks to the end of a flexible diving board. The end of the board bends down a distance of 0.55 m. The diver's weight on the diving board makes it behave like a spring. a) Determine the spring constant of the diving board. b) Calculate the diver&#...
Monday, January 14, 2013 at 4:50pm

Physics
how fast would you have to be traveling at in a spaceship in order to appear to age 20% slower than your classmate left behind on earth
Monday, January 14, 2013 at 3:33pm

physics
what is the kinetic energy of a 3 kg 20 cm diameter bowling ball with a linear velocity of 4m/s? (rolling and spinning)
Monday, January 14, 2013 at 2:36pm

physics
A bullet of mass m=10 g is fired with initial speed vi = 400 m/s into a block of mass M=2 kg initially at rest at the edge of a frictionless table of height h=1 m as shown in the figure. The bullet remains in the block, and after the impact the block lands a distance d from ...
Monday, January 14, 2013 at 2:16pm

physics
Two objects are approaching an intersection. One is a 50 kg traveling at 8 m/s from east to west and the other is a 40 kg going from south to north at 12 m/s. (a) Find the x and y components of the net momentum of this system. (b) What are the magnitude and direction of the ...
Monday, January 14, 2013 at 2:14pm

physics
a small conducted sphere is attached to the end of an insulating rod .it carries a charge of +5.0*10-9 C. the plates ,which are 4.0 cm apart, are connected to a 50 000 V supply. Calculate a)the magnitude of the electric field strenghen between the plates b)the magnitude of the...
Monday, January 14, 2013 at 1:52pm

physics
A small sphere of mass m=.0064kg and charge q1= +28.9 nC is attached to the end of a string and hangs vertically. A second charge of equal mass and charge q2= -58nC is located below the first charge by a distance d= 2.00cm. a. Find the Tension in the string b. If the string ...
Monday, January 14, 2013 at 1:29pm

physics
find the force if f between charges of 100mc -50mc located 50cm a part?
Monday, January 14, 2013 at 1:10pm

physics
find the force if f between charges of +100mc -50mc located 50cm a part?
Monday, January 14, 2013 at 1:06pm

Physics
a stone thrown from ground level returns to the same level of projection 4s after. with what speed was the stone thrown? Take g=10 m/s2
Monday, January 14, 2013 at 12:37pm

Physics
A hockey puck has a mass of 0.120 kg and is at rest. A hockey player makes a shot, exerting a constant force of 29.5 N on the puck for 0.16 s. With what speed does it head toward the goal?
Monday, January 14, 2013 at 12:30pm

Physics
You take a ride in a fast elevator to the top of a tall building and ride back down while standing on a bathroom scale. During which parts of the ride will your apparent and real weights be the same? During which parts will your apparent weight be less than your real weight? ...
Monday, January 14, 2013 at 12:21pm

Physics
A 200-N box is placed on an inclined plane that makes a 35.0° angle with the horizontal. Find the component of the weight force parallel to the plane's surface.
Monday, January 14, 2013 at 12:20pm

Physics
A bag is dropped from a hovering helicopter. The bag has fallen for 1.8 s. What is the bag's velocity? How far has the bag fallen?
Monday, January 14, 2013 at 12:20pm

Physics
A brick is dropped from a high scaffold. (a) What is its velocity after 4.5 s? m/s (b) How far does the brick fall during this time?
Monday, January 14, 2013 at 12:19pm

Physics
Engineers are developing new types of guns that might someday be used to launch satellites as if they were bullets. One such gun can give a small object a velocity of 4.4 km/s while moving it through a distance of only 1.6 cm. (a) What acceleration does the gun give this ...
Monday, January 14, 2013 at 12:17pm

math in physics
find the force if f between charges of 100mc -50mc located 50cm a part?
Monday, January 14, 2013 at 11:26am

Physics
The mass of a string is 9.1 × 10-3 kg, and it is stretched so that the tension in it is 240 N. A transverse wave traveling on this string has a frequency of 240 Hz and a wavelength of 0.42 m. What is the length of the string?
Monday, January 14, 2013 at 4:45am

physics
A Hot Wheels car rolls off a table at a speed of 2.36 m/s and hits the floor a distance of 95.1 cm from the table's edge. Determine the height (in cm) of the table.
Sunday, January 13, 2013 at 11:28pm

Thermodynamic Physics
When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1500 kg automobile traveling at 42 m/s comes to a halt after its brakes are applied, how much can the ...
Sunday, January 13, 2013 at 10:25pm

Physics
A satellite moves in a circular orbit around the Earth at a speed of 5.4 km/s. Determine the satellite’s altitude above the surface of the Earth. Assume the Earth is a homogeneous sphere of radius 6370 km and mass 5.98 × 10 24 kg. The value of the universal ...
Sunday, January 13, 2013 at 10:20pm

Physics
A car with a mass of 1815 kg is traveling down a road for 50 meters. It takes the car five seconds to travel this distance. Calculate the velocity, momentum, and kinetic energy of the car.
Sunday, January 13, 2013 at 10:10pm

Physics
Stand two plane mirrors on their edges and parallel to one another. Place a coin between them near one end. How many images do you see? Draw a ray diagram to explain the formation of the images.
Sunday, January 13, 2013 at 10:05pm

physics
An athlete whirls a 6.6 kg hammer tied to the end of a 1.2 m chain in a horizontal circle. The hammer moves at the rate of 0.432 rev/s. What is the centripetal acceleration of the hammer? Assume his arm length is included in the length given for the chain. Answer in units of m...
Sunday, January 13, 2013 at 10:04pm

Physics
Stand two plane mirrors on their edges and parallel to one another. Place a coin between them near one end. How many images do you see? Draw a ray diagram to explain the formation of the images.
Sunday, January 13, 2013 at 10:04pm

Physics
According to the Guinness Book of World Records (1990 edition, p. 169), the highest rotary speed ever attained was 2010 m/s (4500 mph). The rotating rod was 15 cm (5.9 in) long. Assume the speed quoted is that of the end of the rod. What is the centripetal acceleration of the ...
Sunday, January 13, 2013 at 9:42pm

physics
A 1.62 kg mass attached to a light string rotates on a horizontal, frictionless table. The radius of the circle is 0.986 m, and the string can support a mass of 32.5 kg before breaking. The acceleration of gravity is 9.8 m/s 2 . What maximum speed can the mass have before the ...
Sunday, January 13, 2013 at 9:35pm

PHYSICS
WHEN SIX PEOPLE WHOSE AVERAGE MASS IS 84 KG SIT DOWN IN A CAR, THEY FIND THAT THE CAR DROPS .84 CM LOWER ON ITS SPRINGS. THEN THEY HAVE GET OUT OF THE CAR AND BOUNCE IT UP AND DOWN. THE ACCELERATION OF GRAVITY IS 9.8 M/S^2. WHAT IS THE FREQUENCY OF THE CAR'S VIBRATION IF ...
Sunday, January 13, 2013 at 8:58pm

Physics
A 1060 N crate is being pulled across a level floor by a force F of 300 N at an angle of 35° above the horizontal. The coefficient of kinetic friction between the crate and the floor is 0.25. Find the magnitude of the acceleration of the crate in m/s^2
Sunday, January 13, 2013 at 8:55pm

physics
A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 188.0 N at an angle of 26° with the horizontal. The box has a mass of 30 kg, and the coefficient of kinetic friction between the box and the floor is 0.45. ...
Sunday, January 13, 2013 at 8:52pm

physics
A 3.40 kg block is pushed along the ceiling with an constant applied force of F = 82.0 N that acts at an angle θ = 50° with the horizontal. The block accelerates to the right at 5.80 m/s2. Determine the coefficient of kinetic friction between the block and the ceiling...
Sunday, January 13, 2013 at 8:50pm

physics
A box slides down a 26° ramp with an acceleration of 1.19 m/s2. Determine the coefficient of kinetic friction between the box and the ramp. μk =
Sunday, January 13, 2013 at 8:48pm

Physics
Two forces are applied to a car in an effort to accelerate it, as shown below. The first force, F1 = 364 N, is applied at an angle α = 33° to the forward dashed line. The second force, F2 = 522 N, is applied at an angle β = 11° to the forward dashed line. ...
Sunday, January 13, 2013 at 8:47pm

Physics
I just have a question....How to know if the volt is -ve or not? and How to know if a charge has deficit or excess electrons ?
Sunday, January 13, 2013 at 7:49pm

Physics.
A punter kicks a football at an angle of 45 degrees to the ground. The football has an initial velocity of 25 m/s, make a diagram and calculate: a) How long was the football in the air? b) How far does the football travel horizontally? c) What is the maximum height of the ...
Sunday, January 13, 2013 at 7:28pm

physics
as light passes from air to water vi/vr=4/3 find the angle of incidence of a ray of light if the angle or refration is 25 degrees 40 minutes (i is the angle of incidence and r is the angle of refraction)
Sunday, January 13, 2013 at 7:00pm

Physics
In one cycle, an engine burning a mixture of air and methanol (methyl alcohol) absorbs 525 J and expels 413 J. How much work is done by this engine?
Sunday, January 13, 2013 at 6:52pm

Physics
When one gallon of gasoline is burned in a car engine, 1.20 108 J of internal energy is released. Suppose that 0.99 108 J of this energy flows directly into the surroundings (engine block and exhaust system) in the form of heat. If 5.0 105 J of work is required to make the car...
Sunday, January 13, 2013 at 6:51pm

Physics
A 4.2 kg rock is initially at rest at the top of a cliff. Assuming the rock falls into the sea at the foot of the cliff and that its kinetic energy is transferred entirely to the water, how high is the cliff if the temperature of 1.5 kg of water is raised 0.10°C?
Sunday, January 13, 2013 at 6:51pm

physics
A 33.1 g ring that appears to be silver is heated to a temperature of 77°C, and then placed in a calorimeter containing 5.00 10-2 kg of water at 24.0°C. The calorimeter is not perfectly insulated, however, so that 0.14 kJ of energy is transferred by heat to the ...
Sunday, January 13, 2013 at 6:50pm

Physics
When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1500 kg automobile traveling at 42 m/s comes to a halt after its brakes are applied, how much can the ...
Sunday, January 13, 2013 at 6:49pm

physics
A collision occurs between two pucks on an air-hockey table. Puck A has a mass of 0.020 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 0.040 kg and is initially at rest. The collision is not head-on. After ...
Sunday, January 13, 2013 at 5:43pm

physics
Suppose the charge q2 can be moved left or right along a line connecting charges q1 and q3. Given that q = +15 µC, find the distance from q1 where q2 experiences a net electrostatic force of zero? (The charges q1 and q3 are separated by a fixed distance of 36 cm.) q1=+q...
Sunday, January 13, 2013 at 5:40pm

physics
You kick a .3kg soccer ball at a 30deg. angle. your toe provides an average force of 50N for .5m. How far does the ball go?
Sunday, January 13, 2013 at 5:32pm

physics
In the rectangle in the drawing, a charge is to be placed at the empty corner to make the net force on the charge at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner?
Sunday, January 13, 2013 at 4:49pm

physics
what is the refrevtion of waves? And what are the laws'of refraction? Also about phase change.
Sunday, January 13, 2013 at 3:36pm

physics
Sound is passing perpendicularly through an open window whose dimensions are 1.1 m  0.75 m. The sound intensity level is 95 dB above the threshold of hearing. How much sound energy comes through the window in one hour?
Sunday, January 13, 2013 at 3:32pm

physics
1. What are the examples of supersonic waves? 2. What is match cone, match no? 3. Define echo? 4. What is the effect of frequency on the velocity of sound in a gas? 5. Mathematical expression of beats. ''based on wave motion''
Sunday, January 13, 2013 at 3:25pm

Physics
A 4.90-kg ball, moving to the right at a velocity of +2.50 m/s on a frictionless table, collides head-on with a stationary 8.00-kg ball. Find the final velocities of the balls if the collision meet the following conditions. (a) elastic 4.9-kg ball = 8-kg ball = (b) completely ...
Sunday, January 13, 2013 at 2:58pm

Physics
How would I determine the height of a mountain if I am given direction cosines of vectors from two points on the base of the mountain to the peak?
Sunday, January 13, 2013 at 1:50pm

physics
Two pieces of metal (A and B) are identical in every way, except that A has a much larger thermal expansion coefficient. If equal amounts of heat are added to both pieces of metal, which metal does more work on its surroundings? 1. A 2. B 3. They do the same work. 4. Unable to...
Sunday, January 13, 2013 at 1:17pm

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