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May 23, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

Stream Physics Hydrology - HELP!!!!
1a) An aqueous solution containing 35 kg of endosuflan insecticide is accidentally released into a small stream. The stream dimensions are 17.5 meters wide and 1.15 meters deep. The stream velocity is 1.1 m/s. The stream channel drops 24m over a distance of 10 km. Endosuflan ...
Friday, April 17, 2015 at 1:08pm

physics
If a calculated quantity has units of T • m/A, that quantity could be Answer choices a magnetic torque. 1.0. 2.an electric field. 3.an electric potential. 4.a magnetic field.
Friday, April 17, 2015 at 12:00pm

physics
A charged particle is observed traveling in a circular path of radius R in a uniform magnetic field. If the particle was traveling twice as fast, the radius of the circular path would be 8R. R/4. R/2. 2R. 4R. expanation lso
Friday, April 17, 2015 at 11:19am

physics
1 The specific heat of a substance at its boiling point or melting point Is 0 Is infinity Is negative lies between 0 and 1 2 A unit mass of solid converted to liquid at its melting point. Heat is required for this process is Specific heat Latent heat of vaporization Latent ...
Friday, April 17, 2015 at 10:55am

Physics
Proove a*sin(x)+b*sin(x+phi)=((a+b)^2*cos(phi)^​1/2*sin(x+phi/2)
Friday, April 17, 2015 at 10:53am

Physics
Two plane mirrors are positioned at right angles to one another. A ray of light strikes one mirror at an angle of 30° to the normal. It then reflects toward the second mirror. What is the angle of reflection (from the normal) of the light ray OFF the second mirror? I would...
Friday, April 17, 2015 at 10:45am

Physics
A person whose eyes are 1.50 m above the floor stands in front of a plane mirror. The top of his head is .10 m above his eyes. How far above the floor should the bottom edge of the shortest possible mirror be placed? I know that I need to take half of a number. I just don'...
Friday, April 17, 2015 at 10:26am

physics
a tennis ball is hit vertically upwards with a velocity of 20m/s. what is it's Decelaration as it moves upward? calculate the maximum height reached by the ball.
Friday, April 17, 2015 at 8:57am

physics
A 3.6 -kg mass attached to the end of a string swings in a vertical circle (radius = 17.9 m). When the string is horizontal, the speed of the mass is 3.8 m/s. What is the magnitude of the force of the string on the mass at this position?
Friday, April 17, 2015 at 8:20am

physics
A 1.7 -kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 26.0 m/s. What is the magnitude of the tension in the string at this position?
Friday, April 17, 2015 at 8:20am

physics
A hawk flies in a horizontal arc of radius 12.0 m at a constant speed of 7.1 m/s. It continues to fly along the same horizontal arc but increases its speed at the rate of 7.9 m/s2. Find the acceleration magnitude under these conditions.
Friday, April 17, 2015 at 8:20am

Physics
A tiny source emits sound uniformly in all directions. The intensity level ar a dist. Of 2m is 100dB. How much sound power is the soure emitting?
Friday, April 17, 2015 at 7:18am

physics
A man walks 5.0m due east and then 10.0m N30oE . Find his resultant displacement
Friday, April 17, 2015 at 4:27am

physics
Calculate the magnitude and direction of the electric force if a charge of −3.5 × 10−7 C is placed in a field of 12 N/C [right].?
Friday, April 17, 2015 at 1:01am

Physics
I dont know where to even begin... Two equally charged ping pong balls, each having a mass of 5g repel eachother hanging from different strings attached at the same fixed point above. The angle each makes with the vertical is 30 degrees and they are separated by a distance of ...
Thursday, April 16, 2015 at 11:31pm

physics class
Suppose that you balance a 5 kg ball on the tip of your finger that has an area of 1 cm2. What is the pressure on your finger?
Thursday, April 16, 2015 at 11:21pm

Physics
A ball rolls off the edge of a 0.75m high lab table with a horizontal speed of 1.50 m/s. Calculate the time that the ball is in flight, calculate the vertical velocity of the ball just before striking the floor, and calculate the horizontal distance(range) that the ball will ...
Thursday, April 16, 2015 at 8:39pm

physics
A box is suspended by a steel wire via a frictionless pulley The wire has a mass per length of µ = 24.5 × 10 − 3 kg/m. The box is so heavy and the wire so thin that the mass of the wire does not influence the wire tension. The horizontal part of the wire has ...
Thursday, April 16, 2015 at 6:26pm

Physics
A 1100- kg car collides with a 1400- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 25 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...
Thursday, April 16, 2015 at 4:35pm

physics
A bicycle tire is 82 inches across and has a diameter of 26 inches.
Thursday, April 16, 2015 at 2:59pm

physics
Decide whether each of the following statements are T-True, or F-False. A) Velocity anti-nodes of standing air waves occur at closed ends of tubes. B) Pressure nodes of standing air waves occur at closed ends of tubes. C) Velocity nodes of standing air waves occur at open ends...
Thursday, April 16, 2015 at 2:48pm

College Physics
Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1050Kg and was approaching at 8.00m/s due south. The second car has a mass of 700Kg and was approaching at 20.0m/s due west. A) Calculate the final velocity of the cars.(Note ...
Thursday, April 16, 2015 at 2:07pm

physics
A spaceship has a momentum of 20,000 kg·m/s to the left; its mass is 500 kg. What is the magnitude of its velocity?
Thursday, April 16, 2015 at 1:56pm

statistics
The distribution of B.A. degrees conferred by a local college is listed below, by major. Major Frequency English 2073 Mathematics 2164 Chemistry 318 Physics 856 Liberal Arts 1358 Business 1676 Engineering 868 9313 What is the probability that a randomly selected degree is not ...
Thursday, April 16, 2015 at 11:43am

physics please help
A rock of mass 5kg is pushed over the edge of a cliff which is 200m high 1.ignore air resistance and calculate the speed of the rock at the bottom of the cliff. In reality air resistance cannot be ignored. The rock eventually reaches terminal velocity of 30m/s 2.calculate the ...
Thursday, April 16, 2015 at 10:16am

physics
. A tennis player serves the ball at a height of h with an initial velocity of 40m/s at an angle of 4 0 with the horizontal. Knowing that the ball clears the 0.941m net by 152mm. Determine (a) the height h (b) the distance d from the net to where the ball will land.
Thursday, April 16, 2015 at 9:55am

physics
A helicopter is flying with a constant horizontal velocity of 144.2 kmph and is directly above the point A when a loose part begins to fall. The part lands 6.5seconds later at point B on an inclined surface. Determine (a) The distance 'd' between points A and B. (b) ...
Thursday, April 16, 2015 at 9:54am

physics
A ski jumper starts with a horizontal take-off velocity of 25m/s and lands on a straight landing hill inclined at 30 0 . Determine (a) the time between take-off and landin. (b) The length 'd' of the jump. (c) The maximum vertical distance between the jumper and the ...
Thursday, April 16, 2015 at 9:52am

physics
conducting spherical shells with radiia=10cm and b=30cm are maintained at potentials v(r=b)=0v and v(r=a)=100v.determine v and e in the region between the shells.
Thursday, April 16, 2015 at 8:17am

physics
The coefficient of apparent expansion of a liquid when determined using two different vessels A and B are gamma1 and gamma2 respectively. If the coefficient of expansion of the vessel A is alpha, the coefficient of linear expansion os the vessel B is a)alphaxgamma1xgamma2/...
Thursday, April 16, 2015 at 12:36am

physics
A 15-kg block is on a frictionless ramp that is inclined at 20° above the horizontal. It is connected by a very light string over an ideal pulley at the top edge of the ramp to a hanging 19-kg block, as shown in the figure. The string pulls on the 15-kg block parallel to ...
Wednesday, April 15, 2015 at 10:56pm

physics
A 1000-kg barge is being towed by means of two horizontal cables. One cable is pulling with a force of 80.0 N in a direction 30.0° west of north. In what direction should the second cable pull so that the barge will accelerate northward, if the force exerted by the cable ...
Wednesday, April 15, 2015 at 10:56pm

physics
A 40-kg box is being pushed along a horizontal smooth surface. The pushing force is 15 N directed at an angle of 15° below the horizontal. What is the magnitude of the acceleration (in m/s2) of the crate?
Wednesday, April 15, 2015 at 10:55pm

physics
A car of mass 1100 kg that is traveling at 27 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the braking force (in N) acting on the car?
Wednesday, April 15, 2015 at 10:55pm

physics
At what altitude should a satellite be placed into circular orbit
Wednesday, April 15, 2015 at 10:54pm

physics
If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet, what is the acceleration due to gravity (in m/s2) on that planet?
Wednesday, April 15, 2015 at 10:54pm

Physics
An engineer has an odd-shaped object of mass 16 kg and needs to find its rotational inertia about an axis through its center of mass. The object is supported on a wire along the desired axis. The wire has a torsion constant κ = 0.4 N· m. If this torsion pendulum ...
Wednesday, April 15, 2015 at 8:34pm

Physics
If a 0.50-kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 8.0 N for a distance of 4 m, then what would be the block's velocity?
Wednesday, April 15, 2015 at 8:27pm

Physics
A bicycler rider is traveling at 7m/s. During an 8s period, the bicycle rider then slows down with acceleration to a speed of 3 m/s. How far does the bicycle rider travel during the 8s? d=7m/s s=3m/s t=8s t x s = d/t x t d = s x t
Wednesday, April 15, 2015 at 5:35pm

Science/Physics
My question is you walk 3.9 kilometers to school. In gym, you do the 12 minute run and actually make it 2.4 kilometers. After school you walk your friend home first and then go home it is 3.1 kilometers farther than your morning walk to school. What was your total distance ...
Wednesday, April 15, 2015 at 3:36pm

physics
A skier descends a mountain at an angle of 35.0º to the horizontal. If the mountain is 235 m long, what are the horizontal and vertical components of the skier's displacement?
Wednesday, April 15, 2015 at 11:31am

physics
When responding to sound, the human eardrum vibrates about its equilibrium position. Suppose an eardrum is vibrating with an amplitude of 6.7 x10-7 m and a maximum speed of 3.9 x10-3 m/s. (a) What is the frequency (in Hz) of the eardrum's vibrations? (b) What is the ...
Wednesday, April 15, 2015 at 11:14am

Physics
How much energy is require to set a 0.304m phonograph record into rotation at 33.33 revolution per minute if the mass of the record is 0.11kg?
Wednesday, April 15, 2015 at 10:47am

physics
A boy drops a mango from a tree it falls without rebound wat happens to its momentum
Wednesday, April 15, 2015 at 7:24am

Physics
8. A 4.70 m long pole is balanced vertically on its tip. What will be the speed (in meters/second) of the tip of the pole just before it hits the ground? (Assume the lower end of the pole does not slip.) I did V^2=0^2+2(9.8)(4.70) and was wrong. I did remember to square root ...
Wednesday, April 15, 2015 at 5:03am

Physics
8. A 4.70 m long pole is balanced vertically on its tip. What will be the speed (in meters/second) of the tip of the pole just before it hits the ground? (Assume the lower end of the pole does not slip.) I did V^2=0^2+2(9.8)(4.70) and was wrong. I did remember to square root ...
Wednesday, April 15, 2015 at 4:56am

physics
two identically charged sphere of mass 3 gm each are suspended from a point by threads of length 13 cm. they are separated 10 cm due to repulsion. find the tension of the thread and charge on the sphere?
Wednesday, April 15, 2015 at 2:40am

physics
find the weight of a person with a mass of 68.0kg
Wednesday, April 15, 2015 at 1:00am

Physics
We think of the width of the central maxima on our screen as a measure of the uncertainty in the direction of travel of the protons. What happens to this uncertainty in the direction of travel (momentum) as the slit width narrows?
Wednesday, April 15, 2015 at 12:28am

Physics
When we force protons through a narrow slit, we are gaining certainty in their position. As we gain certainty in their position, what should happen to the certainty on momentum?
Wednesday, April 15, 2015 at 12:26am

Physics
The density of a solid is 130gcm^-3 at the temperature of 25 degree Centrigate.Find the Density at 150 degree Celcius if the linear expansion of the solid is 2.0*10^(-5)K^-1. I got the answer to be 129.03.
Tuesday, April 14, 2015 at 9:05pm

Physics
An antiaircraft gun fires at an elevation of 60° at an enemy aircraft at 10,000m above the ground. At what speed must the cannon be shot to hit the plane at that height.
Tuesday, April 14, 2015 at 8:31pm

Physics
A stone is thrown vertically upward with an initial speed u.if is the acceleration due to gravity,at what time will the stone return to the starting point
Tuesday, April 14, 2015 at 7:20pm

Physics
A cannon ball is projected so as to attain maximum range. Find the maximum height attained if the initial velocity is u
Tuesday, April 14, 2015 at 6:42pm

PHYsics
A centrifuge for separation of sugar crystals in molasses must exert a force of 6 N/g. If the filter drum has a radius of 350 mm, determine the required speed in the revolution per minute I tried the following F = 6 = 10^-3*a a = 6000 = ω^2*r
Tuesday, April 14, 2015 at 12:19pm

physics
How long would it take to bring a 318 kg car moving at 11.2 m/s to a complete stop if a 602.8 N breaking force is applied?
Tuesday, April 14, 2015 at 11:02am

physics
An ideal gas at 19.8 °C and a pressure of 2.79 x 105 Pa occupies a volume of 3.66 m3. (a) How many moles of gas are present? (b) If the volume is raised to 7.20 m3 and the temperature raised to 28.5 °C, what will be the pressure of the gas? I got a) right with 419.46, ...
Tuesday, April 14, 2015 at 10:29am

Technical Physics
A boat is sitting in the middle of the lake. What happens to the water level in the lake when a heavy anchor is thrown overboard? Does the water level rise, lower, or stay the same.
Tuesday, April 14, 2015 at 10:28am

Physics
4 charges Q1=2C, Q2=3C, Q3=3C & Q4=-4C are placed at the vertices of a square of side 10cm. find the force on 5th charge Q5=1C placed at the center of square.
Tuesday, April 14, 2015 at 9:58am

Physics
The density of a solid is 130gcm^-3 at the temperature of 25 degree Centrigate.Find the Density at 150 degree Celcius if the linear expansion of the solid is 2.0*10^(-5)K^-1. I got the answer to be 129.03.
Tuesday, April 14, 2015 at 9:30am

Physics
The angle of a rotating shaft turns in t seconds is given by theta= ω+1/2at^2 and it is given that ω=3 rad/s and α=0.6 rad/s to complete θ=4 radians. Determine the time taken to complete θ=4 radians.
Tuesday, April 14, 2015 at 8:41am

physics
A centrifuge for separation of sugar crystals in molasses must exert a force of 6 N/g. If the filter drum has a radius of 350 mm, determine the required speed in the revolution per minute I tried the following F = 6 = 10^-3*a a = 6000 = ω^2*r
Tuesday, April 14, 2015 at 8:22am

physics
A ball is thrown vertically upward from the edge of a cliff of height 131 m. The initial velocity is 77.7 m/s. how high is the cliff?
Tuesday, April 14, 2015 at 8:11am

physics
A centrifuge for separation of sugar crystals in molasses must exert a force of 6 N/g. If the filter drum has a radius of 350 mm, determine the required speed in the revolution per minute I tried the following F = 6 = 10^-3*a a = 6000 = ω^2*r
Tuesday, April 14, 2015 at 7:01am

physics
a particle covers 1/2 distance between A and B with a velocity V0. during 1/2 of the time required to cover the remaining distance the particle moves with a velocity V1 and rest moves with a velocity V2. find the average velocity of the particle
Tuesday, April 14, 2015 at 6:04am

Physics
In exercising, a weight lifter loses 0.236 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. The work done in lifting weights is 1.41 x 105 J. (a) Assuming that the latent heat of vaporization of perspiration is...
Tuesday, April 14, 2015 at 5:06am

Physics
A train accelerates from the rest at the station A at a rate of 0.8 m/s2 for 25 s, the travels at constant velocity for 77.5 s before it comes to rest at the station B after period of retardation lasting 20 s. What is the distance between stations A and B, and the average ...
Tuesday, April 14, 2015 at 4:16am

physics
Choose one of the Laws of Thermodynamics (zeroth, first, second, or third) and give a brief summary of its development. Who is credited with "discovering" it and when? How did the four laws come to be ordered as they are? Please explain in detail
Tuesday, April 14, 2015 at 2:55am

physics
A machine with an efficiency of 100% is said to be efficient. a) If a lever has a distance of 4m from the pivot to where a load of 500N is applied and a distance of 1m from the pivot to where the load is,calculate the efficiency of the lever when height moved by effort i 3m ...
Tuesday, April 14, 2015 at 2:30am

physics
A 10kilow walts electric motor is used to raise a 400kg load of bricks to a height of 60meters.The efficiency of the motor 80%.what is the input energy?
Tuesday, April 14, 2015 at 2:13am

physics
A particle starts moving from rest with uniform acceleration.It travels a distance x in first 2 sec and a distance y in the next 2 sec.Then Answer) y=3x
Tuesday, April 14, 2015 at 12:46am

physics
a body of mass 25kg,moving at 3m/s on a rough horizontal floor is brought to rest after sliding through a distance of 2.5m on the floor. calculate the coefficient of sliding friction [g=10ms-2]
Tuesday, April 14, 2015 at 12:30am

PHYSICS
Calculate the maximum height the tank shell reaches using the initial speed (18 m/s), half-time(1.8), and angle(75).
Monday, April 13, 2015 at 11:48pm

physics
Calculate the range of the projectile using the initial speed and angle. Use g = 9.8m/s your calculation. Initial speed is 18m/s Angle is 75 Help please !!
Monday, April 13, 2015 at 11:14pm

Physics
A soccer ball is kicked from the edge of a cliff with a velocity of 12.0m/s horizontally. If the ball landed 47.9m from the base of the cliff, how tall is the cliff?
Monday, April 13, 2015 at 7:37pm

physics
A 4.0kg particle collides with a 6.0 kg particle that is at rest at 10m/s. What is the velocity of the particles after the collision
Monday, April 13, 2015 at 7:27pm

physics
When the lights of an automobile are switched on, an ammeter in series with them reads 9.70 A and a voltmeter connected across them reads 12.20 V. When the electric starting motor is also turned on, the ammeter reading drops to 7.30 A and the lights dim somewhat. If the ...
Monday, April 13, 2015 at 5:43pm

Physics
I have a question on fluids. Water in a section 1.2m wide, 2m high. retained by sluice gate that can pivot about its base. There is a retaining cable at the top of the gate. Determine tension in the retaining cable at the top of the gate when the depth of water is 1.8m. ...
Monday, April 13, 2015 at 3:49pm

physics
A flying bat emits squeaks at a frequency of 80 MHz, if a stationary observer picks up the frequency of the squeaks as 78 MHz, is the bat moving towards or away from the listener? Determine the speed of the bat.
Monday, April 13, 2015 at 12:43pm

Physics 2
Calculate the maximum height using the initial speed, half-time, and angle. The initial speeed is 9.8m/s, half time is 1.8, and the angle is 75.
Monday, April 13, 2015 at 9:58am

Physics
Calculate the maximum height using the initial speed, half-time, and angle. The initial speeed is 18m/s, half time is 1.8, and the angle is 75
Monday, April 13, 2015 at 9:52am

Physics
Ann, Sam and you take a trip to the orbiting International Space Station, bringing along a hula hoop that is 1.02 m in diameter (= 2R) and has a mass Mh = 2.0 kg. You are watching from a viewport while Sam and Ann go outside for a (space) walk. You see both Sam and Ann ...
Monday, April 13, 2015 at 8:25am

physics
A block of mass M1 = 15 kg is lying on a horizontal friction-less surface is connected to a string passing over a friction-less pulley. A mass of M2 = 25 kg is hanging at its other end as shown in the figure below. (i) Find the acceleration in the masses. (ii) What is the ...
Monday, April 13, 2015 at 7:35am

Physics
A sprinter crosses the finish line of a race. The roar of the crowd in front approaches her at a speed of 357m/s . The roar from the crowd behind her approaches at 341m/s . A) What is the speed of the sound? B) What is the sprinter's speed?
Sunday, April 12, 2015 at 11:42pm

Physics
You have 250 g of water in an aluminium calorimeter with a mass of 125 g. How long will it take to increase the temperature of the water and calorimeter from 20C to 37C if the system is heated by a resistive heating element with 8 V across the resistor and 0.75 A flowing ...
Sunday, April 12, 2015 at 11:06pm

Physics
A not so brilliant physics students wants to jump from their 3rd floor apartment window to the swimming pool below. The problem is the base of the apartment is 8.00 meters from the pool’s edge. If the window is 20.0 meters high, how fast does the student have to be ...
Sunday, April 12, 2015 at 9:20pm

Physics
3. A bullet is fired from at a shooting range. The bullet hits the ground after 0.32 seconds. How far did it travel horizontally and vertically in this time if it was fired at a velocity of 1100 m/s?
Sunday, April 12, 2015 at 9:19pm

PHYSICS math
2. An airplane is 50,000 m above an observer and 2.1 km to the west of them and 1.5 km to the north of you. Determine the angle to the plane in the x – y axis and the total distance to the plane from you. Choose the x-axis east, y axis north, and z axis up
Sunday, April 12, 2015 at 9:18pm

Physics
Stacy uses a close range telescope, which contains 2 converging lenses, each having a focal distance of 0.750 m, separated by a distance of 1.501 m. If she spots Jane, located a distance of 542 meters away, what is the magnification of the image she sees? is it upright or ...
Sunday, April 12, 2015 at 8:29pm

physics
A crane operator intends to lift a 300 kg piece of equipment using an upward force of 4000 N, will he be able to lift the equipment.
Sunday, April 12, 2015 at 8:17pm

physics
a boy drops a mango from a tree it falls without rebound what happens to it's momentum
Sunday, April 12, 2015 at 5:42pm

PHYSICS
Determine the resulting temperature when 1kg of ice at 0 Degree celcius is mixed with 9kg of water.
Sunday, April 12, 2015 at 4:56pm

physics
An electrical power plant generates electricity with a current of 50A and a potential difference of 20,000 V. In order to minimize the power losses due to the high current heating up the line, a transformer steps up the potential difference to 500,000 V before it is ...
Sunday, April 12, 2015 at 4:45pm

physics
An object whose moment of inertia is 2.5 kg · m^2 experiences the torque shown in the figure below. What is the object's angular velocity at t = 1.6 s? Assume it starts from rest. webassign[.]net[/]knight[/]p13-21[.]gif So far, I know that that to find the ...
Sunday, April 12, 2015 at 4:00pm

physics
1 The principle of conservation of heat energy states that that when an object is at constant temperature or is in thermal equilibrium, it is losing and gaining heat at equal rates. the heat lost by a hot body is equal to the heat gained by the cold body in any system provided...
Sunday, April 12, 2015 at 3:53pm

physics
1 The specific heat of a substance at its boiling point or melting point Is 0 Is infinity Is negative lies between 0 and 1 2 A unit mass of solid converted to liquid at its melting point. Heat is required for this process is Specific heat Latent heat of vaporization Latent ...
Sunday, April 12, 2015 at 3:50pm

Physics
The pressure of water flowing through a 6.5×10−2−m -radius pipe at a speed of 1.8m/s is 2.2 × 105 N/m2 What is the flow rate of the water? What is the pressure in the water after it goes up a 5.2−m -high hill and flows in a 5.0×10−2&#...
Sunday, April 12, 2015 at 3:19pm

Physics
A car with a total mass of 1800kg (including passengers) is driving down a washboard road with bumps spaced 5.0m apart. The ride is roughest—that is, the car bounces up and down with the maximum amplitude—when the car is traveling at 6.1 m/s.What is the spring ...
Sunday, April 12, 2015 at 3:07pm

physics- Space
How does the amount of dark matter in the Universe compare to the amount of ordinary matter? In what way is dark matter similar to ordinary matter? In what way are they different? I got the first one which dark matter is 23% of the universe. But for the other questions, the ...
Sunday, April 12, 2015 at 1:40pm

Physics
a freight train has two engines, each with a mass of 50,000 kg. pulling
Sunday, April 12, 2015 at 8:55am

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