Monday
August 29, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

PHYSICS
A football is kicked from the ground at an angle 30degree above the horizontal with an initial speed 18m/s and directly towards the goalkeeper. If the goal line is a horizontal distance 25m away calculate the vertical height at which the ball crosses the goal line if not ...
Sunday, May 29, 2016 by CHRISTINE

Physics grade 11 HELP
A cannon fires a projectile at 75 m/s at an angle of 56.7 above the horizontal. How high does the projectile get off the ground?
Sunday, May 29, 2016 by Shirley

Physics
If our planet is travelling at 10000 mph (just using hypothetical numbers) and you launched a rocket into space at 10000 mph (ignoring the planets rotational speed to keep this simple) on the same exact path the planet is moving, would the rocket be moving at 20000 mph in space?
Saturday, May 28, 2016 by Will

Physics
A hydraulic press has an input cylinder 4.0cm in diameter and an output cylinder 16cm in diameter. (a) Assuming 100 percent efficiency, find the force exerted by the output piston when a force of 170N is applied to the input piston.
Saturday, May 28, 2016 by Anonymous

Physics
A partially filled bucket of water sits on a scale and its weight is 3.5 N. A piece of metal is suspended from a thread and completely immersed in the bucket (but does not touch the bottom). The scale now reads 7.5 N. Find the volume of the metal.
Saturday, May 28, 2016 by Anonymous

PHYSICS
A ball is dropped onto the floor from a height of 20m. It rebounds to a height of 15m. If the ball was in contact with the floor for 0.01sec what was its average acceleration during the contact take g=10m/s
Saturday, May 28, 2016 by CHRISTINE

Physics
What is the Buoyancy force exerted on a 180kg iron anchor when it is immersed in seawater? The density of iron is 7.8×103 kg/m3 and that of seawater is 1.03 × 103 kg/m3 .
Saturday, May 28, 2016 by Anonymous

Physics
What is the Buoyancy force exerted on a 180kg iron anchor when it is immersed in seawater? The density of iron is 7.8×103 kg/m3 and that of seawater is 1.03 × 103 kg/m3 .
Saturday, May 28, 2016 by Anonymous

Physics
A raft is constructed of wood having a density of 6.00x102 kg/m3. Its surface area is 5.40 m2 and its volume is 0.45 m3. When the raft is placed in fresh water, to what depth h is the raft submerged by its weight? The density of fresh water is 1000 kg/m3. Hint: Use Newton’...
Saturday, May 28, 2016 by Anonymous

Physics
The mass of a liter of milk is 1.032 kg. The butterfat that it contains has a density of 865 kg/m3 when pure, and it constitutes exactly 4.0 percent of the milk by volume. What is the density of the fat-free skimmed milk
Saturday, May 28, 2016 by Anonymous

Physics
A thin sheet of gold foil has an area of 2.98 cm2 and a mass of 6.20 mg. How thick is the sheet? The density of gold is 19, 300 kg/m3.
Saturday, May 28, 2016 by Anonymous

PHYSICS
A player kicks a ball at an angle of 37degree with the horizontal and with an initial speed of of 48ft/s. A second player standing at a distance of 100ft from the first in the direction of the kick starts running to meet the ball at the instant it is kicked. How fast must he ...
Saturday, May 28, 2016 by CHRISTINE

Physics
A spiral spring 20cm long is stretched to 25cm by a load of 50N.What will be its length when streched by 100N assumimg that the elastic limit is not reached?
Saturday, May 28, 2016 by Olamiekan

Physics
A motorboat whose speed in still water is 2.91 m/s must aim upstream at an angle of 30.0 degrees (with respect to a line perpendicular to the shore) in order to travel directly across the stream. - What is the speed of the current? - What is the resultant speed of the boat ...
Friday, May 27, 2016 by Alyssa

Physics
starting with the equation for resistors in parallel, prove that for two resistors R1 and R2, the equivalent total resistance (RT) is: Rt=R1R2/R1+R2 I kind of understand it, but it isn't giving me the right answer which should be the equation?
Thursday, May 26, 2016 by lomonoyan

physics
Si unit of specific inductive capacity?
Thursday, May 26, 2016 by Deepak

physics
A man of weigt 600N runs up the stairs of heigt 4m in 3seconds. what is exerted by the man?
Thursday, May 26, 2016 by vincent

physics
a source emits 1700Hz frequency travelling at a speed of 70m/s. A detector is placed 200m away. What is the frequency detected by the detector when the source is closest to it? Also find the distance between them when the detector detects the frequency to be 1200Hz. Velocity ...
Thursday, May 26, 2016 by please Help urgentlyph

physics
A red racecar accelrates at a constant rate of 5 m/s2. How much time does it take to increase its speed from 50 m/s to 60 m/s? a. 17 s b. 0.058 s c. 0.25 s 2.0 s
Thursday, May 26, 2016 by Pimp

Maths,Physics,Life Science, Agricultural science
list three factors to consider when choosing subject in grade 10
Thursday, May 26, 2016 by sibongile

physics
A police cruiser is travelling at 24 m/s and slows down at a rate of 0.65 m/s2 until it stops. The distance traveled by the cop while slowing down is closest to
Thursday, May 26, 2016 by Pimp

physics
A rectilinear homogeneous conductor OA of mass 12 g and of length 36cm hangs freely from its upper end O while its lower end A slightly touches the surface of the mercury. Terminals C and D are connected to a generator which supplies a current 7.4A. A horizontal magnetic field...
Thursday, May 26, 2016 by amber

physics
Which idea did Isaac Newton’s experiments with light support?
Thursday, May 26, 2016 by br

physics
Four copper wires of equal length are connected in series. Their cross-sectional areas are 0.96 cm^2, 2.02 cm^2, 2.90 cm^2, and 5.06 cm^2. A potential difference of 116 V is applied across the combination. Determine the voltage across the 2.02 cm^2 wire.
Thursday, May 26, 2016 by My question wasn't answered....

PHYSICS
a shell of mass M moving with velocity v breaks into two fragments. one of the mass comes to rest. velocity of the second fragment is
Wednesday, May 25, 2016 by Mariya

Physics
Waves are coming towards your boat at a speed of 4 m/s, you are standing on the fish scale and notice that the reading on the scale changes up and down such that the lowest scale reading is ½ of the maximum scale reading. If the total vertical distance travelled by the ...
Wednesday, May 25, 2016 by Anonymous

Physics
Waves are coming towards your boat at a speed of 4 m/s, you are standing on the fish scale and notice that the reading on the scale changes up and down such that the lowest scale reading is ½ of the maximum scale reading. If the total vertical distance travelled by the ...
Wednesday, May 25, 2016 by Anonymous

Physics
Two positive charged spheres, one with 2 times the charge of the other are 38 cm apart. The net force between them is 0.77 N. What is the charge on the lesser charged sphere?
Wednesday, May 25, 2016 by Becca

physics
A diffraction grating with 1000 slits/cm is oriented parallel to the y-axis and its center is located on the x-axis at x = -5.00 m. A source of light of wavelength 650 nm is located on the x-axis at x = -125 m. At how many locations does constructive interference occur on the ...
Wednesday, May 25, 2016 by Chad

Quick physics help
what does a mirror do to images that it reflects
Wednesday, May 25, 2016 by Anonymous

physics
Four copper wires of equal length are connected in series. Their cross-sectional areas are 0.96 cm^2, 2.02 cm^2, 2.90 cm^2, and 5.06 cm^2. A potential difference of 116 V is applied across the combination. Determine the voltage across the 2.02 cm^2 wire.
Wednesday, May 25, 2016 by vivian

physics
A body is thrown vertically upwards at an initial velocity of 30m/s. Find the velocity after 2s and the time it takes to reach the maximum height.(TAKE g equal 10m/s2(square).
Wednesday, May 25, 2016 by josephafful

Physics
A transverse wave traveling in a string takes 1.40 s to move 13.2 m. The mass of a 8.50 m piece of the string is 1.60 kg. What is the tension in the string?
Wednesday, May 25, 2016 by Kevin

Physics
The string is 0.95 m long with tension 8.00 N. The total mass of the string is 12.34 g. Find the period of the oscillation.
Wednesday, May 25, 2016 by Kevin

physics
a submarine fitted with a SONAR system operates at a frequency 50kHz. An enwmy submarine is now moving towards it with a speed of 450km/hr. Find the frequency of the sound received back at the SONAR from the enemy submarine. Velocity of sound in water is 1450m/s.
Wednesday, May 25, 2016 by please Help urgently

physics
a gun,kept on straight horizontal ground is used to hit a car, traveling along the same road away from the gun with a uniform speed of 72km/h.The car is at a distance of 500m from the gun. when the gun is fired at an angle of 45 degrees with the horizontal. find (1) the ...
Wednesday, May 25, 2016 by jabulani

physics
the range of a rifle bullet is 100m, when thither is the angle of projection if the bullet is fired withe the same angle from a car traveling at 36km/h towards the target, show that the range will increase by 100/7 squire root of tan thither
Wednesday, May 25, 2016 by jabulani

physics
if magnitude of sum of two unit vectors is root2 then find the magnitude of subtraction of these unit vectors
Wednesday, May 25, 2016 by suraj

Physics
A ball thrown vertically upward and return in20 seconds.find the velocity and the maximum height with explanation
Wednesday, May 25, 2016 by Karan

physics
A stone is thrown up with a velocity of 39.2 at an angle of 30° above the horizontal find at what times, it will be at a height of 14.7
Wednesday, May 25, 2016 by jabulani

Physics
I'm confused about this question: "A car traveling at 60 mi/h stops in 6 seconds. How far does it travel during this time?" I can't figure out what formula to use, or how to begin solving this.
Tuesday, May 24, 2016 by Kat

physics
An isolated capacitor of unknown capacitance has been charged to a potential difference of 100 V. When the charged capacitor is then connected in parallel to an un- charged 10.0 μF capacitor, the potential difference across the combination is 30.0 V. Calculate the unknown...
Tuesday, May 24, 2016 by dani

Physics help
what does a mirror do to images that it reflects
Tuesday, May 24, 2016 by Anonymous

physics
A diffraction grating having 180 lines/mm is illuminated with a light signal containing two wavelengths, λ1 = 400 nm and λ2 = 500 nm. The signal is incident perpendicularly on the grating. What is the smallest angle at which two of the resulting maxima are ...
Tuesday, May 24, 2016 by dani

physics
A metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end. A magnetic field of magnitude B = 0:350 T points out of the page. a) If the rails are separated by L = 25.0 cm and the speed of the rod is 55 cm/s, ...
Tuesday, May 24, 2016 by dani

physics
A wire has a resistance of R. What will the wire's resistance be if it is stretched to four times its original length without changing the volume of the wire? (Express in terms of R.) R=V/I; 4R=V/I; R=V/(I/4) I think this is right? help please.
Tuesday, May 24, 2016 by dani

physics
When 115 V is applied across a wire that is 10 m long, the magnitude of the current density is 1.4*10^4 A/m2. Find the resistivity of the wire. R=V/I; R=pL/A => V/I=pL/A => A(x)V/I(x)L=p :(π(5^2))(115)/(1.4*10^4)(10) Is this right? Do I just plug and chug now?
Tuesday, May 24, 2016 by dani

physics
A convex spherical mirror has a radius of curvature of 50 cm. Determine the position and magni cation of the image of an object located 35 cm in front of the mirror. i only know how to do concave mirrors. i have the equations as 1/f=1/d0+1/di for position and m=hi/h0=-di/d0 ...
Tuesday, May 24, 2016 by dani

Physics
A rock is thrown straight up at 22.0 m/s from a roof of a 30.0 m tall building. After rising, the rock falls on the street below. Ignoring air resistance, how much time is the rock in the air? Show the work please :)
Tuesday, May 24, 2016 by Luke

Physics
Heat is added to a system, and the system does 35.0 J of work. If the internal energy increases by 17.0 J, how much heat was added to the system?
Tuesday, May 24, 2016 by AMOOON

Physics
A 50.0-kg boy runs on a horizontal surface at a speed of 10.0 m/s and jumps onto a cart just before reaching a slope as shown in the figure. The cart is initially at rest. If the mass of the cart is 150 kg, what is the maximum height h the boy/cart will reach up the slope ...
Tuesday, May 24, 2016 by Robin

Physics
A 50 kg student, starting from rest, slides down an 10.8 meter high water slide. How fast is he going at the bottom of the slide?
Tuesday, May 24, 2016 by alexis

physics
A 0.26 kg particle moves in an xy plane according to x(t) = - 13 + 1 t - 3 t3 and y(t) = 22 + 6 t - 11 t2, with x and y in meters and t in seconds. At t = 1.2 s, what are (a) the magnitude and (b) the angle (within (-180°, 180°] interval relative to the positive ...
Tuesday, May 24, 2016 by sherf

physics
A car is travelling along the road at 8m/s.IT accelerates at 1m/s for a distance of 18m.how fast is it then travelling?
Tuesday, May 24, 2016 by Anjali

Physics
A person holding a lunch bag is moving upward in a hot air balloon at a constant speed of 6.1 m/s . When the balloon is 28 m above the ground, she accidentally releases the bag. What is the speed of the bag just before it reaches the ground? I got Vf^2= Vo^2 +2ad Vf^2= 0+ (2*9...
Monday, May 23, 2016 by T

Physics
A person holding a lunch bag is moving upward in a hot air balloon at a constant speed of 6.1 m/s . When the balloon is 28 m above the ground, she accidentally releases the bag. What is the speed of the bag just before it reaches the ground? I got Vf^2= Vo^2 +2ad Vf^2= 0+ (2*9...
Monday, May 23, 2016 by T

physics
Coherent light of frequency 6.38×1014 Hz passes through two thin slits and falls on a screen 80.0 cm away. You observe that the third bright fringe occurs at ± 3.08 cm on either side of the central bright fringe. How far apart are the two slits? At what distance ...
Monday, May 23, 2016 by ChrismB

physics
In a marathon race, Chad is out in front, running due north at a speed of 3.92 m/s. John is 94 m behind him, running due north at a speed of 4.33 m/s. How long does it take for John to pass Chad
Monday, May 23, 2016 by jessica

physics
moving beltway at an airport has a speed v1 and a S length L. A woman stands on the beltway as it moves from one end to the other, while a man in a hurry to reach his flight walks on the beltway with a speed of v2 relative to the moving beltway. (a) What time inter- val is ...
Monday, May 23, 2016 by anonymous

Physics
What is the pressure at a depth of 80 m in the ocean? The density of seawater is 1. 03 × 10 3kg/m3. Please express your answer in units of atm.
Sunday, May 22, 2016 by Anonymous

Physics
A barrel will rupture when the gauge pressure inside reaches 345 kPa. A vertical pipe is attached to the lower end of the barrel. The barrel and pipe are filled with oil, density of 1200 kg/m3. How long can the pipe be if the barrel is not to rupture?
Sunday, May 22, 2016 by Anonymous

Physics
A barrel will rupture when the gauge pressure inside reaches 345 kPa. A vertical pipe is attached to the lower end of the barrel. The barrel and pipe are filled with oil, density of 1200 kg/m3. How long can the pipe be if the barrel is not to rupture?
Sunday, May 22, 2016 by Anonymous

Physics
How high (in meters) would the water rise in the pipes of a building if the water pressure gauge shows the pressure to be 252 kPa at ground level?
Sunday, May 22, 2016 by Anonymous

Physics
What is the pressure at a depth of 80 m in the ocean? The density of seawater is 1. 03 × 10 3kg/m3. Please express your answer in units of atm.
Sunday, May 22, 2016 by Anonymous

Physics
A DIVERGING lens has a focal length of 35 cm. (a) Find the image distance when an object is placed 48 cm from the lens. (b) Is the image real or virtual magnified or reduced?
Sunday, May 22, 2016 by Matt

Physics
A DIVERGING lens has a focal length of 35 cm. (a) Find the image distance when an object is placed 48 cm from the lens. (b) Is the image real or virtual magnified or reduced? I am very lost and don't even know where to start
Sunday, May 22, 2016 by Matt

physics
as the permeability of a material is the ratio of the magnetic field strength and the magnetic flux, could the permeability of the material be multiplied by the magnetic field strength in order to calculate the flux?
Sunday, May 22, 2016 by hannah

physics
what is the importance/significance of calculating the magnetic flux density of a solenoid?
Sunday, May 22, 2016 by hannah

physics
An insulated beaker contains 300g of water initially at 30 degree celsius. water at 100 degree celsius is added until the temperature of mixture reaches 50 degree celsius . the specific heat capacity of water is 4.2J/(kg degree celsius). how much water is added?
Sunday, May 22, 2016 by annie

physics
A skier slides down a ski slope with an acceleration 2.2 m/s^2 directed down the slope. The coefficient of kinetic friction between the skis and the slope is 0.24. What is the angle of the slope with the ground?
Sunday, May 22, 2016 by John

Physics
A friend asks you how much pressure is in your car tires. Unfortunately, you have misplaced your gauge but confident in your knowledge of physics you tell your friend “I can figure it out”. From the owner’s manual you find that the car’s mass is 1350 kg and...
Saturday, May 21, 2016 by Anonymous

Physics
One object has a charge of +5.0 × 10−6 C, and a second object has a charge of +2.0 × 10−6 C. The objects are 0.5 meters apart. What is the electrostatic force between them?
Friday, May 20, 2016 by Sarah

Physics
In the motion picture It Happened One Night, Clark Gable is standing inside a stationary but in front of Claudette Colbert, who is seated. The bus suddenly starts moving forward and Clark falls into Claudette’s lap. Why did this happen?
Friday, May 20, 2016 by Patnock Bii Hakurekama

physics
The displacement vector has scalar components of Ax = 80.0 m and Ay = 60.0 m. The displacement vector has a scalar component of Bx = 60.0 m and a magnitude of B = 75.0 m. The displacement vector has a magnitude of C = 100.0 m and is directed at an angle of 36.9° above the...
Friday, May 20, 2016 by Anonymous

physics
A boulder with a mass of 48.3kg is sitting on the top of a 11.8m tall cliff, and the boulder falls off of the cliff. At what height above the ground is the boulder when it reaches a velocity of 6.40m/s? I found that the kinetic energy of the boulder before it falls off is 5585...
Friday, May 20, 2016 by Anonymous

physics
A truck with a mass of 2.00x10^3 kg is coasting along a straight level road at 250.0 m/s. It comes to rest in 300.0m. How much work is done by friction in bring the truck to a stop?
Friday, May 20, 2016 by Anonymous

physics
Suppose the stone is thrown at an angle of 40.0° below the horizontal from the same building (h = 42.0m) as in the example above. If it strikes the ground 36.7 m away, find the following. (Hint: For part (a), use the equation for the x-displacement to eliminate v0t from ...
Friday, May 20, 2016 by mike

physics
A rifle is shot with 30.0m for distance and hit's a target at 1.90cm as a height. What is the flight time? What is the velocity of the shot?
Thursday, May 19, 2016 by Leila

Physics
The difference in temperature between summer and winter causes the length of a pendulum in a clock to change by one part in 27000. If the period of the pendulum is 1 s, what time-difference error will this make in one hour?
Thursday, May 19, 2016 by Kevin

Math
At small town high there are 100 students,each of whom takes atleast one of Biology,Chemistry,or physics.There are 50 student in Biology,60 in chemistry,and 70 in Physics.If 24 students are enrolled in exactly two of the classes,how many students are in all three?
Thursday, May 19, 2016 by Luiz

Physics
An object is placed at a distance of 50cm in front of a mirror of focal length 25cm. Find the image distance. If the object is 10cm high what will be the nature and size of the mirror?
Thursday, May 19, 2016 by Charlesh

physics
A magnetic needle is disposed inside a horizontal coil. In the abscence of any electric current the needle is observed to get oriented in a direction perpendicular to the x'x of the coil. a) what is the direction of the terrestrial magnetic field. b) A current I is allowed...
Thursday, May 19, 2016 by victoria

Physics
a spring is 30 cm long when a mass of 50 grams is placed when it is at rest. when an additional mass of 20 grams is placed, the spring elongates by 2.5 cm. what is the spring constant and what is the original length of the spring?
Thursday, May 19, 2016 by Karl Panelo

SCIENCE PHYSICS
A Sky-diver(falling vertically)starts from rest at time t=0.His acceleration is non-uniform until be reaches a steady speed of 50m/s at t=10s.He open his parachute at t=20s and decelerates until t=25s.From t=25s he falls at a steady speed of 5m/s.Draw the speed-time graph for ...
Thursday, May 19, 2016 by SUMAN DAS

physics
A body is moving with velocity of 10_1.If the motion is uniform; what will be its velocity after 10 second
Wednesday, May 18, 2016 by raj

physics
The drawing shows two situations in which charges are placed on the x and y axes. They are all located at the same distance of 27.4 cm from the origin O. For each of the situations in the drawing, determine the magnitude of the net electric field at the origin.
Wednesday, May 18, 2016 by fyf

physics
Find the tensions in the given diagram. If the object supported weight is 800N T4 70o T5 70o T3 C B T1 T2 50o 30o A 800N
Wednesday, May 18, 2016 by chansa b

physics
The equation y=5sin(3x-4)where y is in millimeters x is in metres and t is in seconds,represents a wave motion
Wednesday, May 18, 2016 by Arugo Assmpta

physics
A wire 20cm long carry current of 2A is placed perpendicular to a uniform magnetic field. If a force of 0.8N acts on it. Calculate the value of the magnetic field intensity B
Wednesday, May 18, 2016 by Rose

Physics
An empty rubber balloon has a mass of 0.0120 kg. The balloon is filled with helium at 0 degrees celsuis, 1 atm pressure, and a density of 0.179kg/m^3. The filled balloon has a radius of .5m a)What is the magnitude of the net force acting on the balloon? b) What is the ...
Wednesday, May 18, 2016 by Sara Draz

11th grade physics
The magnetic field strength along the axis (x'ox) of a solenoid is measured ( o being the center of the solenoid). The adjacent graph represent the length: (The graph represents the variation of B (mT) as a function of x (cm). The numbers on the y axis are 1 2 3 and on the...
Wednesday, May 18, 2016 by vicky

physics
a bullet is fire in a horizontal direction with a muzzle velocity of 300m/s in the absence of air resistance, how far will it have dropped in travely a horizontal distance of(a)20m?(b)40m?(c)60m? how far will it drop in one second
Wednesday, May 18, 2016 by rex

physics
What is quantity of heat required to melt down completely 1kg of ice at 30 degree celsius
Wednesday, May 18, 2016 by Ruth

physics help grade11
In a physics laboratory experiment, a 6.00 kg box is pushed across a flat table by a horizontal force F. A. If the box is moving at a constant speed of 0.35 m/s and the coefficient of friction is 0.12. What is the magnitude of F? B. What is the magnitude of F if the box is ...
Wednesday, May 18, 2016 by jyne

Physics
A man starts running from his home towards east . After covering 60m ,he turns north and runs 80m. If he runs at uniform rate and covers the distance in 1 minute ,then what is its acceleration?
Wednesday, May 18, 2016 by Mohit

Physics
A 67.6 ohms resistor is connected in parallel with a 103.8 ohms resistor. This parallel group is connected in series with a 20.8 ohms resistor. The total combination is connected across a 18.2-V battery. Find a) the current and b) the power dissipated in the 103.8 ohms resistor.
Wednesday, May 18, 2016 by Ellie

physics
A race car accelerates from 50 m/s to 75 m/s over a distance of 400 m. What is the race car’s acceleration?
Wednesday, May 18, 2016 by eli

physics
Find the number of moles in 2.00 L of gas at 35.0°C and under 7.41×107 N/m2 of pressure. Select one: a. 0.051 moles b. 51 ×105 moles c. 58 moles d. 5.8 moles
Tuesday, May 17, 2016 by Sandra

physics
Four items, all with equal masses, are used to construct the device depicted to the right. Two of the items are uniform solid disks, the smaller of which has half the radius of the other. The disks are glued together so that they share a common axle. The other two items are ...
Tuesday, May 17, 2016 by ChrismB

physics
A charge of -5.02 μC is traveling at a speed of 8.86 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 54.6o. A force of magnitude7.85 × 10-3 N acts on the charge. What is the ...
Tuesday, May 17, 2016 by Lily

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Homework Help: Science