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August 31, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
wo cars approach each other on a straight, level highway. Car A travels at 60 km/h and car B at 80 km/h. The driver of car B sees car A approaching at a speed of ________. Two cars approach each other on a straight, level highway. Car A travels at 60 and car B at 80 . The ...
Friday, February 7, 2014 at 12:44am

physics
Water of density 1000 kg/m3 falls without splashing at a rate of 0.241 L/s from a height of 81.3 m into a 0.638 kg bucket on a scale. If the bucket is originally empty, what does the scale read 2.06 seconds after the first drop contacts the bucket? The acceleration due to ...
Thursday, February 6, 2014 at 10:59pm

Physics
) The energy of the first excited state of a hydrogen atom is -0.34 eV ± 0.0003 eV. What is the average lifetime of for this state?
Thursday, February 6, 2014 at 10:46pm

Physics
A student is doing the egg blast lab. Their egg blast device has a total mass of 0.20 kg. It fires off of the launcher at 26 m/s. The egg hits the wall, splatters, and stays stuck to the wall. Find the total impulse on the egg.
Thursday, February 6, 2014 at 9:46pm

physics
A proton, initially traveling in the +x-direction with a speed of 6.00×105m/s , enters a uniform electric field directed vertically upward. After traveling in this field for 4.38×10−7s , the proton’s velocity is directed 45 ∘ above the +x-axis.
Thursday, February 6, 2014 at 9:16pm

physics
a 65kg person dives into the water from the 10m platform. she comes to a stop 2m below the surface of the water. what net force did the water exert on the swimmer? so for the net force i got -2548N i know: vf^2=vi^2 + 2ad vf^2 = 0 + 2(9.8)(10) vf^2 = 196 vf=14m/s therefore to ...
Thursday, February 6, 2014 at 7:34pm

physics
What total capacitances can you make by connecting a 4.98 µF and 8.98 µF capacitor together? series ? parallel?
Thursday, February 6, 2014 at 7:27pm

Physics
An atomic nucleus of radon initially moving at 530 m/s emits an alpha particle in the direction of its velocity, and the new nucleus slows to 410 m/s. If the alpha particle has a mass of 4u, and the original nucleus of radon had a mass of 222u, what speed does the alpha ...
Thursday, February 6, 2014 at 6:35pm

Physics
Vertical beam of mercury (Hg atomic mass =202u) atoms emerges from the oven kept at T= 400K. Consider three atoms, emerging from the oven: one with the average speed, one with the rms speed, and the other with the most probable speed of the Maxwellian distribution a) Find the ...
Thursday, February 6, 2014 at 6:06pm

Physics
A 4 liter sample of a diatomic gas with γ =1.4 confined to a cylinder, is carried through a closed cycle. The gas is initially at 1.00atm. and 300K. First, its pressure is tripled under constant volume. Then it expands adiabatically to its original pressure. Finally the ...
Thursday, February 6, 2014 at 6:05pm

Physics
A 0.018 kg bullet traveling 222 m/s penetrates a 3.9 kg block of wood, and exits the block with a velocity of 72 m/s. If the block was stationary on a horizontal frictionless surface before impact, how fast does it move after the bullet exits?
Thursday, February 6, 2014 at 5:55pm

Physics
Suppose a hockey puck slides down a frictionless ramp with an acceleration of 4.70 m/s2. (a)What angle does the ramp make with respect to the horizontal? (b) If the ramp has a length of 6.40 m, how long does it take the puck to reach the bottom? (c) Now suppose the mass of the...
Thursday, February 6, 2014 at 5:51pm

Physics
A car is moving down a street at 67 km/h. A child suddenly runs into the street. If it takes the driver 1.26 s to react and apply the brakes, how many meters will the car have moved before it begins to slow down?
Thursday, February 6, 2014 at 5:27pm

Physics
Suppose a hockey puck slides down a frictionless ramp with an acceleration of 4.70 m/s2. What angle does the ramp make with respect to the horizontal? Please show steps...
Thursday, February 6, 2014 at 4:18pm

physics
A balloonist floating at an altitude of 150m accidently drops his book and starts to ascend at a constant velocity of 1.2m/s. How will the balloon be when the book reaches the ground?
Thursday, February 6, 2014 at 2:48pm

physics
A.Use newtons first law to explain why whiplash occurs? B.why are cars fitted with head rests?
Thursday, February 6, 2014 at 10:18am

Physics
A 2.75kg block of copper at 22C dropped into 5.25kg of water at 12.0C. What is the final temperature of the mixture? Specific heat: water = 4.19J/kgK copper = 390J/kgK
Thursday, February 6, 2014 at 6:39am

Physics
Can you please help with the following: x^2+2x-35=0 I can't remember how to get the different possibilities. Appreciate help, thanks
Thursday, February 6, 2014 at 6:21am

Physics
A small rock is thrown vertically upward with a speed of 17.0m/s from the edge of the roof of a 32.0m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. What is the speed of the rock just ...
Thursday, February 6, 2014 at 1:38am

Physics
What is the weight of a 22.0 kg mass at the equator on the surface of Saturn? The mass of Saturn is 5.69 x 10^26 kg and the radius of Saturn is 6.03 x 10^7 m I tried this one using the equation : Fg= Gm1m2/r^2 Fg= (6.67 x 10^-11)(22.0kg)(5.69 x 10^26kg) / (6.03 x 10^7m)^2 I ...
Wednesday, February 5, 2014 at 11:54pm

Physics
You can use any coordinate system you like in order to solve a projectile motion problem. To demonstrate the truth of this statement, consider a ball thrown off the top of a building with a velocity v at an angle θ with respect to the horizontal. Let the building be 49.0 ...
Wednesday, February 5, 2014 at 11:17pm

Physics
You can use any coordinate system you like in order to solve a projectile motion problem. To demonstrate the truth of this statement, consider a ball thrown off the top of a building with a velocity v at an angle θ with respect to the horizontal. Let the building be 49.0 ...
Wednesday, February 5, 2014 at 11:09pm

physics
in a modern nonlinear dynamic experiment, small beads are vibrated on a plate; when the beads start to move, interesting patterns form. If the plate vibrates at 250 hz, for what amplitude of motion will the bears start to lift off?
Wednesday, February 5, 2014 at 11:04pm

Physics
A speedboat increases in speed from 21 m/s to 30.9 m/s in a distance 191 m. a)Find the magnitude of its acceleration. Answer in units of m/s^2. b)Find the time it takes the boat to travel this distance. Answer in units of s.
Wednesday, February 5, 2014 at 10:20pm

physics
5. A charge of -5.00 nC and a charge of -2.00 nC are separated by a distance of 40.0 cm. Find the equilibrium position (where the net force equals zero) for a third charge of 15.0 nC.
Wednesday, February 5, 2014 at 7:56pm

physics
A 2.0 kg mass rests on a frictionless wedge that has an acceleration of 15 m/s2 to the right. The mass remains stationary relative to the wedge, moving neither higher nor lower. (a) What is the angle of inclination, θ, of the wedge, i.e., the angle between the inclined ...
Wednesday, February 5, 2014 at 7:04pm

physics
You have designed a rocket to be used to sample the local atmosphere for pollution. It is fired vertically with a constant upward acceleration of 15 m/s2. After 21 s, the engine shuts off and the rocket continues rising (in freefall) for a while. (Neglect any effects due to ...
Wednesday, February 5, 2014 at 6:54pm

Physics
A football is kicked at ground level with a speed of 17.9m/s at an angle of 39.0∘ to the horizontal. How much later does it hit the ground?
Wednesday, February 5, 2014 at 6:49pm

Physics
A 500.0 kg object is attached by a rope through a pulley to a paddle-wheel shaft that is placed in a well-insulated tank holding 25.0 kg of water. The object is allowed to fall, causing the paddle wheel to rotate, churning the water. If the object falls a vertical distance of ...
Wednesday, February 5, 2014 at 6:26pm

physics (clear answer)
An airplane traveling north at 400 m/s is accelerated due east at a rate of 50 m/s2 for 6 s. If the effects of air resistance and gravity are ignored, what is the final speed of the plane?
Wednesday, February 5, 2014 at 6:23pm

physics
A 101.6-N bird feeder is supported by three cables as shown in the figure below. Find the tension in each cable
Wednesday, February 5, 2014 at 6:22pm

physics
you are driving up a long, inclined road . after 1.20 mi you notice that signs along the roadside indicate that your elevation has increased by 550 ft.
Wednesday, February 5, 2014 at 6:20pm

Physics
What is the temperature increase of water per kilogram at the bottom of a 145 m waterfall if all of the initial potential energy is transferred as heat to the water?
Wednesday, February 5, 2014 at 6:18pm

Physics
A 3.00 gram lead bullet travels at a speed of 240 m/s and hits a wooden post. If half the heat energy generated remain with the bullet, what is the increase in temperature of the embedded bullet? (clead = 128 J/kg C)
Wednesday, February 5, 2014 at 6:16pm

physics
Two boxes are connected by a cord running over a pulley as shown in the picture below. Box I of mass 8.0 kg is on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg. What is the tension in the cord? 35 N ...
Wednesday, February 5, 2014 at 6:10pm

physics
As a rock of mass 3.0 kg drops from the edge of a 60. meter high cliff, it experiences air resistance, whose average strength during the fall is 22. N. At what speed will the rock hit the ground? Answer 1.5 m/s 13 m/s 18 m/s 26 m/s 34 m/s
Wednesday, February 5, 2014 at 6:10pm

physics
A 15.0-kg box is released from rest on a rough inclined plane tilted at an angle of 45° to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200. What is the force of kinetic friction on the box? Answer Fifteen square root of ...
Wednesday, February 5, 2014 at 6:07pm

physics
A basketball is launched with an initial speed of 10.0 m/s and follows the trajectory shown. The height of the basket y= 1.50m.From what distance x the ball is shot? Note: The drawing is not to scale. Angle is 45degrees
Wednesday, February 5, 2014 at 5:40pm

physics
A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +5.2 m/s and ax = +5.9 m/s2. The y components of the puck's initial velocity and acceleration are ...
Wednesday, February 5, 2014 at 5:36pm

Physics
You are pulling a crate across the floor. The crate has a mass of 75.0 kg. You exert a horizontal force of 120. N to the left. Friction exerts a force of 82.0 N to the right. What is the magnitude (fill in box) and direction of the acceleration of the crate?
Wednesday, February 5, 2014 at 5:26pm

physics
A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 30° above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box? Square root of three meters per second squared. Four square ...
Wednesday, February 5, 2014 at 5:25pm

Physics
) What is the minimum uncertainty in the velocity of an electron that is known to be somewhere between 0.050 nm and 0.10 nm from a proton?
Wednesday, February 5, 2014 at 5:06pm

physics
The wavelength of a pulse is 0.1925mm. There are 5 cycles in the pulse. What is the spatial pulse length?
Wednesday, February 5, 2014 at 4:55pm

physics
The pulse duration of the transducer is 0.6 microseconds. The frequency of the transducer is 8MHz. How many cycles are contained in that pulse?
Wednesday, February 5, 2014 at 4:54pm

physics
what is the propagation speed of a 5MHz transducer?
Wednesday, February 5, 2014 at 4:53pm

physics
What is the wavelength of a 4MHz transducer?
Wednesday, February 5, 2014 at 4:51pm

physics
If an ultrasound beam at the focal zone has a power of 0.050 watts and the area at this focal zone is 4cm^2, what is the intensity of the beam?
Wednesday, February 5, 2014 at 4:50pm

Physics
If you can throw a stone straight up to a height of 18m, how far could you throw it horizontally over level ground? Assume the same throwing speed and optimum launch angle.
Wednesday, February 5, 2014 at 4:50pm

Physics
If the period of a transducer is 0.83msec, what is the HZ?
Wednesday, February 5, 2014 at 4:48pm

physics
If the frequency of a transducer is 5MHz, what is the period?
Wednesday, February 5, 2014 at 4:47pm

physics
Find the length of a simple pendulum that has a period of 5.00s . Assume g = 9.81 m/s2. Express your answer to three significant figures and include the appropriate units.
Wednesday, February 5, 2014 at 4:41pm

Physics
If the period of the moon were 31 days while its orbit radius 3.8x10^8m, what would the mass of the Earth be?
Wednesday, February 5, 2014 at 3:21pm

Physics
Two trains, each having a speed of s, are headed at each other on the same straight track. A bird that can fly at speed 2s flies off the front of one train when they are d apart and heads directly for the other train. On reaching the other train it flies directly back to the ...
Wednesday, February 5, 2014 at 2:10pm

Physics
A particle starts from the origin at t = 0 and moves along the positive x axis. A graph of the velocity of the particle as a function of the time is shown in the figure; the v-axis scale is set by vs = 7.0 m/s. (a) What is the coordinate of the particle at t = 5.0 s? (b) What ...
Wednesday, February 5, 2014 at 2:09pm

physics
A red ball of mass 0,6 kg,travelling at 5 m.s^-1 on a frictionless surface ,stikes a stationary green ball of mass 0,3 kg.after the collision,the red ball continues to move in its original direction at 2m.s^-1,while the green ball moves in front of the red ball. Determine the ...
Wednesday, February 5, 2014 at 1:52pm

physics
thanks for the answer but can i get more explanation
Wednesday, February 5, 2014 at 12:40pm

Physics
How much energy (in MeV) is released in the reaction proton + deuteron goes to 3He + gamma? (You may ignore the initial kinetic energy of the reactants.) For the purposes of this problem, use the following masses (in MeV/c2): Proton: 938.783263054 Neutron: 939.5657182828 ...
Wednesday, February 5, 2014 at 9:58am

Physics
How much energy (in MeV) is released in the reaction proton + deuteron goes to 3He + gamma? (You may ignore the initial kinetic energy of the reactants.) For the purposes of this problem, use the following masses (in MeV/c2): Proton: 938.783263054 Neutron: 939.5657182828 ...
Wednesday, February 5, 2014 at 9:26am

Physics
Consider an interstellar spaceship powered by matter-antimatter reactions. The energy resulting from the matter-antimatter reactions is ejected from the exhaust as electromagnetic radiation producing thrust. The design goal is to have the thrust produce an acceleration equal ...
Wednesday, February 5, 2014 at 9:25am

physics
7/8 part of a substance decays in 45 days what is its half life
Wednesday, February 5, 2014 at 7:44am

Physics
we have to transpose the following equation to find p, but I dont quite understand how to come up with the correct answer: x^2/p^2 + y^2/q^2 = 1 Appreciate help, thanks
Wednesday, February 5, 2014 at 6:04am

Physics
A source traveling at 100m/s emits sound waves of frquency 900hz ..what is the velocity of the sound ?
Tuesday, February 4, 2014 at 11:46pm

physics
A constant force of 900 N pushes a 100 kg mass up the inclined plane shown above at a uniform speed of 5 m/s. ( hight= 1m) The power developed by the 900 N force is most nearly: 400 W 800 W 900 W 1000 W 4500 W
Tuesday, February 4, 2014 at 11:46pm

physics
The cart of mass 10 kg shown above moves without frictional loss on a level table. A 30 N force pulls on the cart horizontally to the right. At the same time, a 10 N force at an angle of 60° above the horizontal pulls on the cart to the left. What is the magnitude of the ...
Tuesday, February 4, 2014 at 11:44pm

physics
The two blocks of masses M and 2M shown above initially travel at the same speed v but in opposite directions. They collide and stick together. What is the final velocity of the mass M after the collision? negative one sixth v. negative one third v. Zero one sixth v. one third...
Tuesday, February 4, 2014 at 11:35pm

physics
Two trains face each other on adjacent tracks. They are initially at rest, and their front ends are 34 m apart. The train on the left accelerates rightward at 1.18 m/s2. The train on the right accelerates leftward at 1.19 m/s2. (a) How far does the train on the left travel ...
Tuesday, February 4, 2014 at 11:31pm

physics
The figure above shows an object of mass 0.5 kg that is suspended from a scale and submerged in a liquid. If the reading on the scale is 4 N, then the buoyant force that the fluid exerts on the object is most nearly: 1.3 N 1.0 N 0.75 N 0.33 N 0.25 N
Tuesday, February 4, 2014 at 11:30pm

physics
For which of the following motions of an object must the acceleration always be zero? I. Any motion in a straight line II. Any free fall motion III. Any motion in a circle it can be more than one :P
Tuesday, February 4, 2014 at 11:28pm

physics
If the field strength is E = 9 V/m a distance of 1 m from the charge, what is the field strength E a distance of 3 m from the charge?
Tuesday, February 4, 2014 at 11:13pm

physics
What must the charge (sign and magnitude) of a particle of mass 1.47g be for it to remain stationary when placed in a downward-directed electric field of magnitude 690N/C ? Use 9.81m/s2 for the magnitude of the acceleration due to gravity. PART B What is the magnitude of an ...
Tuesday, February 4, 2014 at 11:13pm

physics
A large plane having uniform charge density has an electric field just outside the plane that points directly toward the plane with magnitude 1.25×104N/C . What is the surface charge density? Express your answer with the appropriate units.
Tuesday, February 4, 2014 at 11:12pm

physics
if a charged plane has a uniform surface charge density of −1.5×10−7C/m2 , what is the magnitude of the electric field just outside the plane’s surface? Express your answer to two significant figures and include the appropriate units.
Tuesday, February 4, 2014 at 11:11pm

physics
An electric dipole lies on the x-axis, consisting of a -2.3nC charge at x = -11cm and a +2.3nC charge at x = 11cm . Part A Compute the electric field at the point (–16cm , 0). Find the magnitude of the electric field. Express your answer to two significant figures and ...
Tuesday, February 4, 2014 at 11:10pm

physics
Two point charges are placed on the x axis. (Figure 1) The first charge, q1 = 8.00nC , is placed a distance 16.0m from the origin along the positive x axis; the second charge, q2 = 6.00nC , is placed a distance 9.00m from the origin along the negative x axis. Calculate the ...
Tuesday, February 4, 2014 at 11:09pm

physics
A 23.6μC point charge lies at the origin. Find the electric field at the point (0.55m , 0). What is the magnitude of the electric field? Express your answers using two significant figures. Enter the x and y components of the field separated by a comma. Find the electric ...
Tuesday, February 4, 2014 at 11:06pm

physics
Two point charges, -20μC and +40μC , are separated by a distance of 17.0cm . What is the magnitude of the electric field at a point halfway between the two charges? Express your answer to two significant figures and include the appropriate units
Tuesday, February 4, 2014 at 11:02pm

physics
have homework due soon, need help thanks. Two point charges are placed on the x axis.(Figure 1) The first charge, q1 = 8.00nC , is placed a distance 16.0m from the origin along the positive x axis; the second charge, q2 = 6.00nC , is placed a distance 9.00m from the origin ...
Tuesday, February 4, 2014 at 11:02pm

Physics
The earths mass is m=5.98*10^24 kg and physics students masss is 70 kg. Knowing that the gravitational force between the student and the earth is 392 N of force, what is the distance between the student and the Earths center?
Tuesday, February 4, 2014 at 11:01pm

physics
Consider a swimmer who wants to swim directly across a river as shown in the figure below. If the speed of the current is 0.29 m/s and the swimmer's speed relative to the water is 0.64 m/s, how long will it take her to cross a river that is 14 m wide?
Tuesday, February 4, 2014 at 9:15pm

physics
truck covers 40.0 m in 7.50 s while uniformly slowing down to a final velocity of 2.65 m/s. (a) Find the truck's original speed. (b) Find its acceleration. m/s2
Tuesday, February 4, 2014 at 8:28pm

Physics
A girl sitting on a merry-go-round moves counterclockwise through an arc length of 3.75 m. If the girl’s angular displacement is 2.12 rad, how far is she from the center of the merry-go-round? Answer in units of m
Tuesday, February 4, 2014 at 8:20pm

Physics
A girl sitting on a merry-go-round moves counterclockwise through an arc length of 3.75 m. If the girl’s angular displacement is 2.12 rad, how far is she from the center of the merry-go-round? Answer in units of m
Tuesday, February 4, 2014 at 8:17pm

physics (this one is killing me clear answer)
At time t = 0 s, a puck is sliding on a horizontal table with a velocity 3.60 m/s, 35.0° above the +x axis. As the puck slides, a constant acceleration acts on it that has the following components: ax = –0.360 m/s2 and ay = –0.980 m/s2. What is the velocity of ...
Tuesday, February 4, 2014 at 7:34pm

physics
A beach ball, moving with a speed of +1.28 m/s rolls off a pier and hits the water a horizontal distance of 0.74 m from the end of the pier. How high (magnitude only) above the water is the pie?
Tuesday, February 4, 2014 at 7:01pm

physics
Vector has a magnitude of 5.10 units and points due east. Vector points due north. (a) What is the magnitude of , if the vector + points 27.4 ° north of east? (b) Find the magnitude of + .
Tuesday, February 4, 2014 at 6:57pm

physics
a 1710 kg passes over a hill that follows the arc of a circle of radius 41.5 meters. what is the maximum speed the car can have passing this point so the car does not leave the road
Tuesday, February 4, 2014 at 6:13pm

physics
An object (with charge -4.2 µC and mass 0.024 kg) hovers at rest above the ground, its weight being held up by a uniform electric field.(a) Find the size and direction of this electric field.(b) If the electric charge on the object is quadrupled while its mass remains ...
Tuesday, February 4, 2014 at 6:04pm

Physics
A bat in a cave emits a sound pulse and receives an echo 0.15 second later. Assuming that the speed of sound is 345 m/s, how far did the sound (a longitudinal wave!) travel during this time?
Tuesday, February 4, 2014 at 5:41pm

physics
An object (with charge -4.2 µC and mass 0.024 kg) hovers at rest above the ground, its weight being held up by a uniform electric field.(a) Find the size and direction of this electric field.(b) If the electric charge on the object is quadrupled while its mass remains ...
Tuesday, February 4, 2014 at 5:37pm

Physics
At a given temperature O2 molecules will move (3/2)1/2 faster than O3 molecules on the average. True or False? I'm not sure if it is true or false on this one, but I think its false. If you mix a gas, eventually all the molecules have the same kinetic energy on the average...
Tuesday, February 4, 2014 at 4:40pm

Physics
A ball is dropped from a height of 20 m. You can use the relation between the work done by gravity and the change in the ball's kinetic energy to determine the speed of the ball at any point in its free fall. The speed of the ball when it hits the ground =
Tuesday, February 4, 2014 at 4:39pm

Physics Please check my answers
A sound of 7 kHz frequency is well within the normal hearing range of most people. True. False. << 2. Sound is a transverse compression wave. True. False.<< 3. The decibel level of a sound can have a negative value. True.<< False. 4. The Doppler effect occurs...
Tuesday, February 4, 2014 at 4:12pm

physics
In what circumstances can the angular velocity of system of particles change without any change in the system\'s angular momentum? This cannot happen under any circumstances. This can happen if an external net torque is applied properly to the system. This can happen if ...
Tuesday, February 4, 2014 at 3:46pm

Physics
The process shown on the PV diagram is A P – V graph with a vertical line with an arrow pointing up.The process shown on the PV diagram is: adiabatic. isothermal. isochoric isobaric.
Tuesday, February 4, 2014 at 2:58pm

physics
A 100-cm3 container has 4 g of ideal gas in it at 250 kPa. If the volume is changed to 50 cm3 and the temperature remains constant, what is its new density? Answer 400 kg/m3 250 kg/m3 80 kg/m3 50 kg/m3
Tuesday, February 4, 2014 at 2:57pm

physics
An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at a temperature of 30.°C. How many molecules are there in the gas? 6.1 × 1023 6.0 × 1022 2.4 × 1022 2.3 × 1023
Tuesday, February 4, 2014 at 2:56pm

Physics
The molecular mass of oxygen molecules is 32, and the molecular mass of nitrogen molecules is 28. If these two gases are at the same temperature, the ratio of nitrogen's r m s speed to that of oxygen is: (8)1/2:(7)1/2 8:7 (7)1/2:(8)1/2 7:8
Tuesday, February 4, 2014 at 2:53pm

Physics
A metre rule is found to balance at 51cm mark.When a body of 70g is suspended at the 10cm mark,the balance point is found to be at 25cm mark.Find the mass of the ruler and the distance of the balance point from the zero end,if the body were move to the 20cm mark.
Tuesday, February 4, 2014 at 9:09am

Physics
After a snow storm, your driveway of area 50m^2 is covered with a layer of ice 10cm high at a temperature of 0C. You decide to use sunlight falling at 200 W/m^2 to melt the ice? Is it good idea? (Density of ice is 920kg/m^3 and 1 cal = 4.184 J.
Tuesday, February 4, 2014 at 7:39am

Physics
In a physics experiment, 250g of water is placed in a 50g calorimeter cup made of aluminum when both are at 15C. Steam at 100C is completely absorbed by passing it through the water, raising the temperature of water and cup to 45C. Find the mass of steam absorbed. Specific ...
Tuesday, February 4, 2014 at 7:32am

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