Friday
May 6, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
Dolphins can hear ultrasound with frequencies up to 280 kHz. What is the speed of sound in water if the wavelength of ultrasound with a frequency of 2.80 × 10^5 Hz is 0.510 cm? How long would it take this sound wave to travel to a dolphin 3.00 km away?
Monday, January 25, 2016 by sam

physics
A ship anchored at sea is rocked by waves whose crests are 21 m apart. The waves travel at 5.6 m/s. How often do the wave crests reach the ship?
Monday, January 25, 2016 by sam

physics
A biophysics student measures her reaction time by having a friend drop a meterstick between her fingers. The meterstick falls 0.300 meters before she catches it. (a) What is her reaction time? (b) Estimate the minimum average speed of nerve impulses going from her eye to her ...
Monday, January 25, 2016 by tom

Physics
A 1.5 tall student throws a baseball with a horizontal component of velocity of 25m/s. It takes 3.00s to come back to its original height. d. how far did the ball travel horizontally? e. What is the initial velocity in the y-direction? f.At what angle is the baseball thrown?
Monday, January 25, 2016 by Emely

Physics
Two equal points charges of +3.00 X 10-6C are placed 0.200m apart. What are the magnitude and direction of the force each charge exerts on the other?
Monday, January 25, 2016 by van

physics
A 1200kg car moves along a horizontal road at speed v0=23.3m/s,the road is wet, so the static friction coefficient between the road and the tires is only µs=0.209 and the kinetic friction coefficient is even lower µk=0.1463. The acceleration due to gravity is 9.8m/...
Monday, January 25, 2016 by Alex

Physics
King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 63 m/s and an angle of 42°. A cannonball that was accidentally dropped hits the moat below in 1.1 s. How far from the castle wall does the cannonball hit the ...
Monday, January 25, 2016 by Needs help!

Physics
A 0.0475 kg ice cube at −30.0°C is placed in 0.577 kg of 35.0°C water in a very well insulated container. The latent heat of fusion of water is 334 kJ/kg, the specific heat of ice is 2092 J/(kg · K), and the specific heat of water is 4184 J/(kg · K...
Monday, January 25, 2016 by Art

physics
a man holds a child on his shoulders while watching a football match. How much work has he done if the game lasts for 2 hours
Monday, January 25, 2016 by divine

Physics
(a) In 2009, Usain Bolt ran the last 100 meters of the 150-meter race in 8.70 seconds. What is Usain Bolt’s speed? (b) The world record for the 100-meter dash is 9.58 seconds (Bolt, 2009). Use the speed from part (a) as his maximum velocity. Assume a sprinter accelerates ...
Monday, January 25, 2016 by Tom

Physics
(a) A magazine article states that cheetahs are the fastest sprinters in the animal world and that a cheetah was observed to accelerate from rest to 70 kilometers per hour in 2 seconds. What average acceleration in meters per second squared does this require? (b) The article ...
Monday, January 25, 2016 by Tom

physics
an object takes 0.35 seconds to hit the floor, what height did it fall from? is the way to calculate it h = gt^2 / 2 so would it be = h = .5 * 9.8 * 0.35^2
Monday, January 25, 2016 by james

Physics
A biophysics student measures her reaction time by having a friend drop a meterstick between her fingers. The meterstick falls 0.300 meters before she catches it. (a) What is her reaction time? (b) Estimate the minimum average speed of nerve impulses going from her eye to her ...
Monday, January 25, 2016 by Tom

Physics
is the mechanical energy of a teflon coated block sliding down a rough incline remaining constant?
Monday, January 25, 2016 by Marie

Physics
A faulty celcius thermometer read 0.7 degree celcius at the melting point of pure ice and 99.5 at the boiling point of water at normal pressure. Calculate the correct temperature when it reads 30 degree celcius. At what temperature will its reading be exactly correct
Monday, January 25, 2016 by Shredder

Physics
On a distant planet, an astronaut drops a wrench. The wrench falls a distance of 1.52m in a time of 0.705s. What is the acceleration due to gravity on this planet?
Monday, January 25, 2016 by JuliePham

Physics
What would be the average velocity of an object falling 1.25m from the rest, just as it strikes the ground?
Monday, January 25, 2016 by JuliePham

Physics
What would be the average velocity of an object falling 1.25m from the rest?
Monday, January 25, 2016 by JuliePham

physics
to forces are applied to a car in an effort b to move it ,as shown in figure .a) what is the resultant of these two forces ? b). if the car has a mass of 3000 kg , what acceleration does it have ? ignore friction.
Monday, January 25, 2016 by m adnan

physics
Estimate the average speed of the apollo spacecaft in m/s, given that the craft took five days to reach the moon from eaeth .the moon is 3.8*10 to the power 8m from earth.
Monday, January 25, 2016 by m adnan

Mathematics,Science(physics,chemistry and biology)
Two similarly charged identical ping pong balls are suspended from the common support with the help of two threads.Calculate angle between the two threads and also calculate the tension in two strings.
Monday, January 25, 2016 by Shhd

physics
a small airplane flies a straight line at the speed of 225 km/hrs. How long does it takes the plane to fly in 30km in minute, hours and seconds
Monday, January 25, 2016 by Anonymous

physics
A light rope is attached to a block with a mass of 10 kg that rests on a horizontal, frictionless surface, and a block of mass, m, is suspended from the other end. The tension in the rope is 20 N when the blocks are released. a) What is the acceleration of the 10 kg block? b) ...
Monday, January 25, 2016 by MHECY

physics
A water fall is 84 metre.If half of kinetic energy is converted into heat.What is the rise in the temperature of water?
Monday, January 25, 2016 by uzair

physics
An applied force of 450N is needed to drag a 100kg crate at a constant speed across a horizontal rough floor. Calculate the coefficient of kinetic friction for the crate on the floor.
Monday, January 25, 2016 by Anonymous

physics
You are a blacksmith and have been working with 14.0 kg of steel. When you are finished shaping it, the steel is at a temperature of 405°C. To cool it off, you drop it into a bucket containing 3.0 kg of water at 55°C. How much of this water is converted to steam? ...
Monday, January 25, 2016 by chase

physics
You drop 454 g of solid ice at −35°C into a bucket of water (1,200 g) at 45°C. Eventually, the ice all melts, and the entire system comes into thermal equilibrium. Find the final temperature of the system.
Monday, January 25, 2016 by chase

physics
Consider Joule's experiment described in the insight below. Assume the mass m = 2.3 kg and the fluid is water with a volume of 1.75 L. What is the increase in the temperature of the water when the mass moves vertically a distance z = 1.55 m?
Monday, January 25, 2016 by chase

physics
An ice cube of volume 7.6 cm3 is initially at a temperature of -11.4°C. How much heat is required to convert this ice cube into steam?
Monday, January 25, 2016 by chase

physics
An Air plane flys from san fransico to new-york about 4800km at speed of 300m/s how much time does trip take as measured by observer in the plane?B and by observer in the plane?
Sunday, January 24, 2016 by Best

physics
An Air plane flys from san fransico to new-york about 4800km at speed of 300m/s how much time does trip take as measured by observer in the plane?
Sunday, January 24, 2016 by john

Physics
An airplane has a velocity of 580 km/h relative to the moving air. At the same time, a wind blows northward with a speed of 92 km/h relative to earth. The airplane is moving in an easterly direction relative to earth. Find the speed of the airplane to relative to earth (answer...
Sunday, January 24, 2016 by Frank

Physics
A tennis player strikes a ball when it is 1 m above the ground, with a velocity 17 m/s at 30 degrees above the horizontal. The net is 4 m away horizontally and it is 0.6 m high. How high, vertically, above the net does the ball pass?
Sunday, January 24, 2016 by Andy

Physics
A block and tacle of 6 pulley is used to raise a load of 300n steadily through a height of 30m if the workdone against friction is 2000j. calculate the workdone by the effort,the applied effort,the efficiency of the system
Sunday, January 24, 2016 by HAKEEM

Physics
A quarterback throws a football at 38 m/s at a certain angle above the horizontal. If it took the ball 6.41 s to reach the top of its path, how long was it in the air? * I want to say that the formula you use is distance. But im not sure. O r manybe even find out what ...
Sunday, January 24, 2016 by Ann

physics
An 8.7 kg block slides with initials speed of 1.66 m/s across a level floor. How far does the block slide before it comes to rest!? I used F= m(v(sq)/2s)...is that right?
Sunday, January 24, 2016 by Lilinau

Physics- HELP PLEASE!
Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 µC and -6 µC respectively. The charges on the lower left and right corners are -2.4 µC and -9 µC respectively. The net electric...
Sunday, January 24, 2016 by Ellie

Physics II
An electron with an initial speed of 5.0 ✕ 105 m/s enters a region in which there is an electric field directed along its direction of motion. If the electron travels 9.0 cm in the field before being stopped, what are the magnitude and direction of the electric field?
Sunday, January 24, 2016 by Beat

Physics
We study three point charges at the corners of a triangle. Their charges are q1 = +4.0 10-9 C, q2 = −2.5 ✕ 10−9 C, and q3 = +5.0 10-9 C. Two distances of separation are also given, ℓ12 = 6 m and ℓ13 = 9 m. Find the net electric force on q3 1- ...
Sunday, January 24, 2016 by Anonymous

Physics
A ball is thrown straight up at a launch velocity of 15m/s. What is the velocity when it returns to the throwers hand?
Sunday, January 24, 2016 by Barbara

physics
A 960 kg sports car crosses the rounded top of a hill with a radius of 52 m. Calculate a) the force the car exerts on the road at the highest point of the hill. The speed of the car is 70 km/h.
Sunday, January 24, 2016 by pujesh

physics
An inverted image is magnified by 2 when the object is placed 22cm in front of a concave mirror. Determine the image distance and the focal length
Sunday, January 24, 2016 by portia

Physics
A 3,0kg cart moving East with a speed of 1.0ms^-1 collides head-on with a 5.0 kg cart that is initially moving West with a speed of 2.0 m.s^-1. After the collision, then 3.0 kg cart is moving to the left with a speed of 1.0 m.s^-1. IGNORE THE FRICTION, WHAT IS FINAL VELOCITY ...
Sunday, January 24, 2016 by Asive

physics
A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 12.6 m/s. The cliff is 49.1 m above a flat horizontal beach as shown in the figure. a.How long after being released does the stone strike the beach below the cliff? b.With ...
Sunday, January 24, 2016 by Help plz

Physics
A 275 kg motor cycle and rider accelerate from restand reach a velocity of 20m.s-1 West.the motor cycle wheels exert an average force of 710N East on the road. Calculate the minimum time taken to reach a velocity of 20m.s-1
Sunday, January 24, 2016 by Anonymous

math
In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also,4 of them offer physics and chemistry but not biology,3 offer physic and biology but not chemistry,6 offer biology and chemistry but not physics if 13 of them offer physics only how...
Sunday, January 24, 2016 by dapo

Physics
A ball is thrown verically upwards from the top of the tower with a speed of 100 m/s. It strikes the pond near the base of the towerafter 25 second. The height of tower is
Sunday, January 24, 2016 by mohit

physics
an airplane from rest has an accelerated time of 200m/s at lest 25 seconds in totaly.what is the distance the airplane from take off?
Sunday, January 24, 2016 by lourdes

Physics
An object weighs 500N.what is its mass?
Sunday, January 24, 2016 by Ck

physics
A 400N weight is sitting on a piston. The diameter of the piston is 8 cm. How much pressure does the weight exert on the piston?
Saturday, January 23, 2016 by sabrina

physics
John pushes on a 400 kg refrigerator with a force of 800 N. While sliding a friction force of 300 N acts on the refrigerator. What is the acceleration of this refrigerator?
Saturday, January 23, 2016 by vincent

Physics
A proton is released from rest inside a region of constant, uniform electric field E1 pointing due North. 14.8 seconds after it is released, the electric field instantaneously changes to a constant, uniform electric field E2 pointing due South. 8.07 seconds after the field ...
Saturday, January 23, 2016 by Joe

Physics
A pickup truck (2268 kg) and a compact car (1100 kg) have the same momentum. If the same horizontal net force were exerted on both vehicles, pushing them from rest over the same distance, what is the ratio of their final kinetic energies? (ratio: truck to car)
Saturday, January 23, 2016 by random guy

Physics 30
A system containing a frictionless pulley is described in the diagram on the right (the 2.0 kg box is on the floor while the 3.0 kg box is 0.5m high) . If this system is released, what will be the momentum of: A. the 2.0 kg box when the 3.0 kg box hits the floor? b. the 3.0 kg...
Saturday, January 23, 2016 by Mona

physics
A ball is thrown straight up at 20.0 m/s. How fast is the ball moving after 2.00 s?
Saturday, January 23, 2016 by elli

Physics 30
A system containing a frictionless pulley is described in the diagram on the right (the 2.0 kg box is on the floor while the 3.0 kg box is 0.5m high) . If this system is released, what will be the momentum of: A. the 2.0 kg box when the 3.0 kg box hits the floor? b. the 3.0 kg...
Saturday, January 23, 2016 by Mona

Physics
A ball is thrown straight up at 24.0 m/s. Ignore the effects of air resistance in your calculations.After 2.00 s?
Saturday, January 23, 2016 by Kayla

Sta 112
This is my question every one . Please help me have it already I had 6 as my answer. In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also 4 of them offer physics and chemistry but not biology,3 offer physics and biology but not ...
Saturday, January 23, 2016 by Anonymous

Physics
A car starts from rests and accelerates at a rate of 4 feet per second squared. How far does the car travel in 10 seconds?
Saturday, January 23, 2016 by Robin

Physics 30
A frictionless pulley (a 2.0 kg is on the floor while the 3.0 kg is 0.5m high) . when released, momentum of the 2kg is?
Saturday, January 23, 2016 by Mona

Physics
A student drops a lead ball 4" in diameter from the top of a large live oak tree. As the ball is falling, a bird flies under it, slowing the ball's velocity to 30 feet/sec. Two seconds later the ball strikes the ground. What is the coefficient of friction due to air ...
Saturday, January 23, 2016 by Johnny

Physics
Hail forms high in the atmosphere and can be accelerated to a high speed before it reaches the ground. Estimate the terminal speed of a spherical hailstone that has a diameter of 2.8 cm. Hint: The mass of a piece of hail that has a volume of 1 cm3 is about 1 g.
Saturday, January 23, 2016 by Kirsten

Physics
Car A travelling at 13 m/s [N] is 190m behind car B which is travelling at 9.0 m/s [N]. At this moment car A starts to accelerate at 6.0 m/s^2 [N] to catch up with car B. After 1.0s, car B also starts to accelerate at 2 m/s^2 [N]. How long will it take car A to catch up with ...
Saturday, January 23, 2016 by jerry

PHYSICS
Do the mass of a body determine the gravity they possess(sun)
Saturday, January 23, 2016 by STEVIUM

physics
The weight of a solid in air is four times greater than the weight of solid in water. Find its weight of which solid in water if it has relative density is 64.
Saturday, January 23, 2016 by Jefferson

PHYSICS
WORKER ARE LOADING EQUIPMENT INTO A FREIGHT ELEVATOR AT THE TOP FLOOR OF A BUILDING HOWEVER THEY OVERLOAD THE ELEVATORAND THE WORN CABLE SNAPS THE MASS OF THE LOADED ELEVATOR AT THE TIME OF THE ACCIDENT IS 1600KG..AS THE ELEVATOR FALLS,THE GUIDE RAILS EXCERT A CONSTANT ...
Saturday, January 23, 2016 by WASEEM

PHYSICS
A CAR IS MOVING INITIALLY AT A SPEED OF 50MI/H WEIGHTING 3000LB IS BROUGT TO A STOP IN A DISTANCE OF 200FT FIND THE BRAKING FORCE.AND FIND TIME REQUIRED TO STOP ASSUMING THE SAME BRAKING FORCE..AND FIND THE DISTANCE AND TIME REQUIRED TO STOP IF THE CAR WERE GOING 25MI/H ...
Saturday, January 23, 2016 by WASEEM

PHYSICS
WHAT IS THE MASS AND WEIGHT OF 1420LB OF SNOMOBILE AND 412KG OF HEAT PUMP?
Saturday, January 23, 2016 by WASEEM

Physics
with what minimum speed must a ball be thrown straight up in order to reach a height of 34 meters above the launch position?
Friday, January 22, 2016 by Kay

Physics
what are 2 examples of elastic collisions not discussed in class
Friday, January 22, 2016 by Rebecca S.

physics
a 1200kg car is moving on the freeway at 30 m/s. (a) Find the magnitude of its momentum and its kinetic energy in SI units. (b) At what speed, in m/s, will the car's momentum be half of what it is in part (a). (c) At what speed, in m/s, will the cars kinetic energy be half...
Friday, January 22, 2016 by van

Damon or DrBob please help..chemistry/physics
Question: 0.37 litre of an ideal monatomic gas (Cv,m = 3R/2) initially at 51 °C and 36 atm pressure undergo an expansion against a constant external pressure of 1.06 atm, and do 2.3 kJ of work. The final pressure of the gas is 1.06 atm. Calculate the change in enthalpy, &#...
Friday, January 22, 2016 by Ashley

physics
a mass if 10kg move with a velocity of 4ms-1find it kinetic energy.
Friday, January 22, 2016 by lydia

physics
a 0.300kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.80 m/s when it makes a head on collision with a stationary 0.150kg glider. (a) Find the magnitude and direction of the final velocity of each glider in the collision is elastic. (...
Friday, January 22, 2016 by chyenne

physics
a 2646lb car is moving on the freeway at 69 mph. (a) Find the magnitude of its momentum and its kinetic energy in SI units. (b) At what speed, in m/s, will the car's momentum be half of what it is in part (a). (c) At what speed, in m/s, will the cats kinetic energy be half...
Friday, January 22, 2016 by chyenne

Physics
A Boeing 747 "Jumbo Jet" has a length of 59.7 m. The runway on which the plane lands intersects another runway. The width of the intersection is 25.0 m. The plane decelerates through the intersection at a rate of 5.0 m/s2 and clears it with a final speed of 29 m/s. ...
Friday, January 22, 2016 by Adriana

Physics
For stephen . .Can we make or combine tachyons with shoes to increase our speed to approach the speed of light. If u have gone to d past how do u intend to come bak presently
Friday, January 22, 2016 by Afeez

physics
A body has mass 400kg on earth. What will be it mass on the moon if the Acceleration due to gravity is 9.8m/s2?
Friday, January 22, 2016 by Nyame Godfred

physics
Help me to answer this!! What is meant by energy-mass relationship?w Explain with examples.
Friday, January 22, 2016 by Ali

physics
a cyclist does work at the rate of 500w while riding. how much force does her foot push with, when she is traveling at 8.0 m/s?
Friday, January 22, 2016 by ty

physics
How much effort force would be needed to roll a barrel with a resistance force of 100N up an inclined plane with a height of 2m and an inclined plane of 8m?
Friday, January 22, 2016 by Jean

physics
For an ocean wave that has the crests 6 m apart and passing a boat every two seconds, calculate the speed of the wave.
Friday, January 22, 2016 by sam

Physics
HOW MUCH HEAT IS ABSORBED WHEN THE BLOCK OF COPPER OF MASS 0.05kg and specific capacity 390j/kg is heated for 20 degree celsius and 70 degree celsius
Friday, January 22, 2016 by Supreme

physics
the turn ratio of transformer is 1:10.A battery of 12v is connected to the primary coil,what is the voltage drop across the secodary coil
Friday, January 22, 2016 by balu

physics
: what is the density of an object with the mass 60g and volume 25cm cube
Friday, January 22, 2016 by Majesty

Physics
An automobile having a mass of 1220 kg is driven into a brick wall in a safety test. The bumper behaves like a spring of constant 2.42 × 106 N/m and compresses 2.99 cm as the car is brought to rest. What was the speed of the car before im- pact, assuming no energy was ...
Friday, January 22, 2016 by Emma

Physics
A 500kg piano is being lowered into position by a crane while to people steady it with ropes pulling to the sides.Bob's rope pulls to the left, 15' below the horizontal, with 500N of tension.Ellen's rope pulls toward the right, 25' below horizontal. a)What ...
Friday, January 22, 2016 by King

fluid physics
Water is pumped through a pipe of diameter 15.0 cm from theColorado River up to Grand Canyon Village, on the rim of thecanyon. The river is at 564 m elevation and the village isat 2096 m. (a) At what minimum pressure must the water be pumped to arrive atthe village? (b) If ...
Thursday, January 21, 2016 by Johnneybrib

physics
A baseball pitcher throws a baseball with a speed of 48 m/s . In throwing the baseball, the pitcher accelerates it through a displacement of about 3.5 m, from behind the body to the point where it is released how long was it in the air before returning to earth?
Thursday, January 21, 2016 by linds

Physics
A 5 kg ball is moving 4m/s to the right when it collided least ally with a 2 kg ball moving at 6 m/s to the left. After the collision, the 5 kg ball is moving .8 m/s to the right. What is the velocity of the 2 kg ball?
Thursday, January 21, 2016 by Brock

physics
a 200 N wooden platform is suspended from the roof of the house by ropes attached to it's ends. it has a total length of 4.2 meters. a painter weighing 650 N stands from the left end of the platform. find the tension in each end of the ropes .
Thursday, January 21, 2016 by jessa

physics
In a certain right triangle, the two sides that are perpendicular to each other are 7.00 m and 8.30 m long. What is the tangent of the angle for which 7.00 m is the opposite side?
Thursday, January 21, 2016 by john

physics
In a certain right triangle, the two sides that are perpendicular to each other have lengths h = 4.40 m and b = 8.70 m. What is the length of the third side of the triangle?
Thursday, January 21, 2016 by john

physics
A right triangle has a hypotenuse of length 2.00 m, and one of its angles is 24.0°. What are the lengths of the following sides? (a) the side opposite the 24.0° angle (b) the side adjacent to the 24.0° angle
Thursday, January 21, 2016 by john

Physics
An object of mass m = 2.9 g and charge Q = +42 µC is attached to a string and placed in a uniform electric field that is inclined at an angle of 30.0° with the horizontal. The object is in static equilibrium when the string is horizontal. a) Find the magnitude of the...
Thursday, January 21, 2016 by Alexa

Physics
A car travels at a constant speed around a circular track whose radius is 2.8 km. The car goes once around the track in 430 s. What is the magnitude of the centripetal acceleration of the car?
Thursday, January 21, 2016 by Melanie

physics 1
A ladder 8.70 m long leans against the side of a building. If the ladder is inclined at an angle of 69.0° to the horizontal, what is the horizontal distance from the bottom of the ladder to the building?
Thursday, January 21, 2016 by jojo

Physics
A wheel is rotating at a rate of 2.5 revolutions every 3.6 s. Through what angle, in radians, does the wheel rotate in 1.0 s?
Thursday, January 21, 2016 by Melanie

physics 1
The base of a pyramid covers an area of 13.0 acres (1 acre = 43,560 ft2) and has a height of 481 ft. If the volume of a pyramid is given by the expression V = (1/3)bh, where b is the area of the base and h is the height, find the volume of this pyramid in cubic meters.
Thursday, January 21, 2016 by jojo

physics 1
A house is 80.0 ft long and 22 ft wide, and has 8.0 ft high ceilings. What is the volume of the interior of the house in cubic meters and cubic centimeters?
Thursday, January 21, 2016 by jojo

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Homework Help: Science