Saturday
October 1, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
Alright, I can't figure it out, here's the problem. 3. A boy is giving his little sister a ride in the wagon. He pulls with an applied force of 20N. The frictional force against him is 20N and the sled is traveling 2m/s. If the boy pulls the wagon 45m, how much work ...
Thursday, January 28, 2016 by Ashtin

physics
2)if a curved of radius 50m is banked at 30 degree will a car travelling at 60 km/hr along the curve will safe?
Thursday, January 28, 2016 by Rutvik

Physics
Calculate the torque on a coil in a motor of length 0.2m and a width of 0.1m which carries a current of 5A placed in a magnetic field of 0.5T and has 1 turn.
Thursday, January 28, 2016 by Jack Brown

Physics
A body weighs 60g in air and 40g in water . the specific gravity 100g in air
Thursday, January 28, 2016 by Banajyotsna

Physics
From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the drawing shows, the bullet puts a hole in a window of another building and hits the wall that faces the window. (y = 0.42 m, and x = 6.4 m.) Using ...
Thursday, January 28, 2016 by Adriana

Physics
As preparation for this problem, review Conceptual Example 10. The drawing shows two planes each about to drop an empty fuel tank. At the moment of release each plane has the same speed of 140 m/s, and each tank is at the same height of 4.00 km above the ground. Although the ...
Thursday, January 28, 2016 by Adriana

Physics
A ball is thrown upwards with an initial velocity of 70 m/s 1. What is the velocity after 3 seconds? 2. What is the acceleration at the top of its path? 3. How many seconds does it take the ball to go up? 4. How many seconds does it take to hit the ground? 5. How high does the...
Thursday, January 28, 2016 by Mateo

Physics
If A Wire Of Length 250m Is Place In A Magnetic Field Of 575militesla And Conductor Move 25m/s Across The Field, Find The E.M.F Induce
Thursday, January 28, 2016 by Uduakobong

Physics
A thin metallic spherical shell of radius .5m has a total charge of 8 μC uniformly distributed on it. At the center of the shell is placed a point charge of 4 μC. What is the electric field at a distance of .15 m from the center of the spherical shell? I know that EA...
Wednesday, January 27, 2016 by Joe

Physics
It has two flags, each exactly 25.4 mm long, with the midpoints of the flags separated by 162 mm. The first flag interrupts the photogate timer for a time 50 ms, and the second flag interrupts the photogate timer for a time 45 ms. 1) What was the average velocity of the glider...
Wednesday, January 27, 2016 by Anonymous

physics
The speed of a space shuttle is 3.2×10^6 cm/s. Convert this into miles per hour (mph) using only 12 inches/ft, 60 seconds/min, 60 minutes/hour, and 1 inch = 2.54 cm. Factor Analysis must be used. Express your result to three significant digits and in scientific notation.
Wednesday, January 27, 2016 by sam

Physics
A particle of mass 57 g and charge 70 µC is released from rest when it is 34 cm from a second particle of charge −12 µC. Determine the magnitude of the initial acceleration of the 57 g particle. Answer in units of m/s2.
Wednesday, January 27, 2016 by Ayo

Physics
A rock dropped from the top of a building takes 0.55 s to fall the last 50% of the distance from the top to the ground.How tall is the building?
Wednesday, January 27, 2016 by Anonymous

physics
A batter hits a ball, causing it to leave the bat at 135 m/s and at an angle of 18.3 degrees from the horizontal. If the baseball field is level, and ignoring the height at which the batter hits the ball, how far (horizontally, in meters) away from the batter does the ball hit...
Wednesday, January 27, 2016 by julia

physics
Position vector r⃗ has magnitude of 15.0 m and direction angle 250 ∘. Find its components. Find the components, magnitude, and direction of the vector −2r⃗ . Where do I start?
Wednesday, January 27, 2016 by brad

physics
In a cathode-ray tube, electrons are projected horizontally at 1.0×10^6 m/s and travel a horizontal distance 11.5 cm across the tube. How long are the electrons in flight? Express your answer to two significant figures and include the appropriate units. Find the vertical...
Wednesday, January 27, 2016 by julia

Physics
A charge of -3.17 μC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.115 m). The charges on the circle are -3.96 μC at the position due north and +5.03 μC at the position due east. What is the ...
Wednesday, January 27, 2016 by Abby

physics
In a marathon race, Chad is out in front, running due north at a speed of 4.09 m/s. John is 94 m behind him, running due north at a speed of 4.28 m/s. How long does it take for John to pass Chad?
Wednesday, January 27, 2016 by Rhonda

physics
When driving west toward the Rocky Mountains, you see a peak 2.6 ∘ above the horizon. Your GPS gives your current elevation as 1490 m , and according to the map, you're 25.0 km (horizontally) from the peak. Find the peak's elevation. I thought it would be 1490+...
Wednesday, January 27, 2016 by lauren

Physics
You have a neutral balloon. What is its charge after 12000 electrons have been removed from it? The elemental charge is 1.6 × 10−19 C. Answer in units of µC.
Wednesday, January 27, 2016 by Ayo

analytical physics chemestry lab
You are provided with a 0.5M solution of NaCl. You require a working solution of 0.004M. Describe how you would prepare this working solution, including all steps and calculations. Hint: You want to use the least amount of reagents and consumables, serial dilutions.
Wednesday, January 27, 2016 by ruby

physics
A force of 55 N at an angle of 32 degrees to the horizontal is applied to drag a 15kg box across a horizontal floor at a velocity of 2.5 m/s. The coefficient of friction between the box and the floor is 0.25 and the box is moved 15m across the floor. How much work is done by ...
Wednesday, January 27, 2016 by Jan Dupre

Physics
A 2700 kg car traveling to the north is slowed down uniformly from an initial velocity of 29.8 m/s by a 7540 N braking force acting opposite the car’s motion. a) What is the car’s velocity after 2.77 s? Answer in units of m/s.
Wednesday, January 27, 2016 by Anonymous

Physics
A proton and an alpha particle (q = +2.00e, m = 4.00u ) are fired directly toward each other from far away, each with an initial speed of 0.247c. What is their distance of closest approach, as measured between their centers? (Hint: There are two conserved quantities. Make use ...
Wednesday, January 27, 2016 by Anonymous

Physics
a spring extends by 10 cm when a mass of 100g is attached to it. what is the spring constant?
Wednesday, January 27, 2016 by Rose

Physics
A small rectangular ferry boat is 3.87 m wide and 5.81 m long. When a loaded truck pulls onto it, the boat sink an additional 4.31 cm into the river. What is the weight of the truck? The acceleration of gravity is 9.8 m/s^2. Answer in units of kN.
Wednesday, January 27, 2016 by Luma

Physics
A 1.8 kg rectangular air mattress is 2.46 m long, 1.23 m wide, and 0.189 m thick. What mass can it support in water before sinking? Answer in units of kg.
Wednesday, January 27, 2016 by Luma

Physics
A piece of metal weighs 51.8 N in air, 37.2 N in water, and 42.6 N in an unknown liquid. Find the density of the metal. Answer in units of kg/m^3 Find the density of the unknown liquid. Answer in units of kg/m^3
Wednesday, January 27, 2016 by Luma

Physics
A dense plastic toy of mass 1.8 kg is floating just beneath the surface of a pond. What is the buoyant force on it? Answer in units of N.
Wednesday, January 27, 2016 by Luma

Physics
A rectangular barge 6 m long and 3 m wide float in fresh water. Water density is 1000 kg/m^3 horse? Answer in units of m. If the barge can only be pushed 5.34722 cm deeper into the water before water overflows to sink it, how many 350 kg horses can it carry?
Wednesday, January 27, 2016 by Luma

Physics
A floating ball normally weighs 7 N. The acceleration of gravity is 9.8 m/s^2. What is the size of the buoyant force that acts on it? Answer in units of N.
Wednesday, January 27, 2016 by Luma

PHYSICS
A UNIFORM METER RULE IS PIVOTED AT P IN 80cm mark on the meter rule force 0.2 And 0.8N Are Applied At M The 60Cm Mark And Q The 90Cm Mark.If The Rule Is In Equilibrium .Find The Mass Of The Rule.Take g=10ms-2
Wednesday, January 27, 2016 by PRINCE

PHYSICS
A BODY OF 50N Rest On A Smooth Plane Incline At 30 Degree To The Horizontal Which Force Applied Parallel To The Plane Will Keep The Body In Equilibrium
Wednesday, January 27, 2016 by PRINCE

Physics
A bullet fired vertically upwards reaches a height of 500m. [g=9.8m/s2]. What is its initial velocity?
Wednesday, January 27, 2016 by Anonymous

physics
an operating 100-watt lamp is connected to a 120-volt outlet. what is the total energy used by the lamp in 60. seconds
Wednesday, January 27, 2016 by sean

Physics
A 6.80 x 10^4 kg space shuttle moving at 7.90 x 10^4 m/s reenters the earth's atmosphere 80.0 km above the earth's surface. What is the shuttle's total mechanical energy with respect to earth's surface? I know the answer is E= 2.173 x 10^12J But I don't ...
Wednesday, January 27, 2016 by Danny

physics
a billiard ball rolling across a table at 1.50m/s makes a head on collision with an identical ball. find the speed of each ball after the collision;when the ball is at rest;when the 2nd ball ]is moving towards the first at the speed of 1.0m/s; when the second ball is moving ...
Wednesday, January 27, 2016 by raquel

PHYSICS
PLEASE POST MY ANSWER
Wednesday, January 27, 2016 by PRINCE

PHYSICS
A BLOCK OF WOOD REST ON AN INCLINE PLANE AND THE COEFFICIENT OF FRICTION BETWEEN THE BLOCK AND THE PLANE IS KNOWN TO BE 0.31 At What Angle Must The Plane Be Inclined To The Horizontal So That The Block Begins To Move Down The Plane
Wednesday, January 27, 2016 by PRINCE

PHYSICS
A CAR TRAVELLING AT 30M/S Overcome A FrictionAlly Resistance Of 100N While Moving.What Is The Power Of The Engine(Take 1 Hp=3/4 Kw)
Wednesday, January 27, 2016 by PRINCE

Physics
Two large parallel plates are separated by a small gap of distance 2 mm. See figure below. A fluid with dynamic viscosity µ = 10-3 Pa.s fills the gap between the plates. The surface area of each side of the plates is 2 m2. The top plate has a velocity 2.0 m/s in the x-...
Wednesday, January 27, 2016 by Jeremy

Physics
W.K.T, Magnetic Force qvB=mv^2/r ... n we know how to prove it too.... But how to show that the radius of curvature of the circular path is proportional to the linear momentum of the charge ?
Wednesday, January 27, 2016 by Minho

Physics
Determination of the boiling point of 0.01m solution of aluminum chloride and barium chloride and sodium chloride?
Tuesday, January 26, 2016 by Rahul ude

Physics
A pilot flies out of Cleveland and sets his compass due North. He maintains an airspeed of 250 km/hr. After 30 minutes he finds that the plane is 200 km north and 40 km west of the starting point. What is the velocity of the wind? I've made my triangle and found the ...
Tuesday, January 26, 2016 by Erin

Physics
A river flows at 6min/s and a boat can move at 4min/s relative to the water.If the boat heads perpendicular to the bank find the velocity relative to the ground.
Tuesday, January 26, 2016 by Rona

Physics
An 1750 kg weather satellite moves in a circular orbit with a gravitational potential energy of 1.69 x 10^10 J. At it's location, free-fall acceleration is only 6.44 m/s^2. How high above Earth's surface is the satellite?
Tuesday, January 26, 2016 by Selena

Physics
the pressure at a point below a point below the surface of the sea is caused by both the height of the water above that and the air pressure on the surface of the sea. if the diver reaches a depth of 20m below the surface on the surface of the sea Calculate The total pressure ...
Tuesday, January 26, 2016 by Joe

physics
C1=3.00uF and Vab = 120V. The charge on capacitor C1 is 150 uC. Calculate the voltage across the other two capacitors.
Tuesday, January 26, 2016 by chyenne

Physics
An airplane flying horizontally 1000 meters above the ground at 200 km per hr drops a bomb on a target on the ground. Determine the acute angle between the vertical and the line joning the airplaod and target at the instant when the bomb is released.
Tuesday, January 26, 2016 by Angel

physics
A capacitor has a capacitance of 7.28uF. What amount of excess charge must be placed on each of its plates to make the potential difference between the plates equal to 25.0V?
Tuesday, January 26, 2016 by van

Physics
Please help me. I need physics help. I don't understand how to do these questions. Can someone show me what I should use? and explain. I'll do calculations by myself. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. ...
Tuesday, January 26, 2016 by PhysicsQuestions- repost because of no response

Physics
A person wants to launch a water balloon and hit the top of a tower, 50.0 meters away. The water balloon launcher is angled at 25 degrees. The water balloon leaves the launcher at 68 m/s. If the balloon hits the top of the tower, how high was the tower?
Tuesday, January 26, 2016 by Drew

Physics
A body initially at distance given an acceleration of 12/s2 (squared2 ). Find the velocity after it travelled 205. Q2. A body moving in linear motion start with an initial acceleration after 205 was 12m/s2. What's the velocity at this instance?
Tuesday, January 26, 2016 by Dorothy

Physics
Two trains are moving toward each other with speeds of 23 mph and 37 mph. How far apart are they before they pass each other? A. 60 miles B. 30 miles C. 6 miles D. 3 miles E. 2 miles F. 1 mile
Tuesday, January 26, 2016 by Sandy East Ward

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 ...
Tuesday, January 26, 2016 by tommy

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 ...
Tuesday, January 26, 2016 by tommy

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 ...
Tuesday, January 26, 2016 by tom

PHYSICS
What reaction occurs between hydrogen and helium which gives the heat and of the sun
Tuesday, January 26, 2016 by STEVIUM

Physics
I need physics help. I don't understand how to do these questions. Can someone show me what I should use? and explain. I'll do calculations by myself. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first ...
Tuesday, January 26, 2016 by Physics

physics
(a)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 at a constant rate up to their maximum velocity, which is maintained for the remainder of the race, no matter how long it...
Tuesday, January 26, 2016 by tom

Physics
i41 tinypic com/2qna74k png (add the periods) For the vectors in the figure, with a = 6.4, b = 2.5 and c = 6.87. Calculate a(dot)b calculate a(dot)c calculate b(dot)c I got 0 for a(dot)b but the same method (ac*cos(theta)) does not work for the other two, please help.
Tuesday, January 26, 2016 by John brown

Physics
What is the use of MODEM at the transmitting end?
Tuesday, January 26, 2016 by Minhye

Physics
What is Analog Pulse Modulation ?
Tuesday, January 26, 2016 by Minhye

science(physics)
the no of wave in 6cm of vacum is same as that of no of wave in xcm of medium refractive index of given medium is 3/2 find the value of x
Tuesday, January 26, 2016 by Anonymous

physics
the no of wave in 6cm of vacum is same as that of no of wave in xcm of medium is 3/2 find the value of x
Tuesday, January 26, 2016 by rani

Marble hall
Is it possible to start pure maths and physics at college ?
Tuesday, January 26, 2016 by blackey

physics
A bus of mass 2500kg goes round a corner of radius 50m at a speed of 5m/s. what force is needed for the bus to go round the corner?
Tuesday, January 26, 2016 by Physics

Physics
A shaft is turning at 71.6rad/s at time zero. Thereafter, its angular acceleration is given by α = –10.8rad/s2 – 4.42 t rad/s3 where t is the elapsed time. Calculate its angular speed at t = 2.73s. and How far does it turn in these 2.73s
Tuesday, January 26, 2016 by Annie

Physics
Wat direction will the Electric Field Lines be in a parallel plate capacitor containing a dielectric ?
Tuesday, January 26, 2016 by Minhye

Physics
A merry-go-round is a common piece of playground equipment. A 6.42m diameter merry-go-round with a mass of 648.0kg is spinning at 39.4rpm. John runs tangent to the merry-go-round at 6.36m/s, in the same direction that it is turning, and jumps onto the outer edge. John's ...
Tuesday, January 26, 2016 by Ken

Physics
A tennis ball, starting from rest, rolls down a hill. At the end of the hill the ball becomes airborne, leaving at an angle of 35° with respect to the ground. Treat the ball as a thin walled spherical shell (I=2/3 mr^2 )and determine the range x it travels if it starts at ...
Tuesday, January 26, 2016 by Tim

Physics
A uniform 160 N ladder rests against a perfectly smooth wall, making a 70 degree angle with the wall (ladder is 7 m long). (a) find the normal forces that the wall and the floor exert on the ladder. B) what is the friction force on the ladder at the floor? I tried to solve the...
Tuesday, January 26, 2016 by Adolfo

physics
When a load of 1(10)^6 N is placed on a ship, the ship only sinks 2.5 cm into the ocean (sea water). Estimate the cross-sectional area of the ship at water level.
Monday, January 25, 2016 by luma

physics
Styrofoam has a density of 300 kg/m^3. What is the maximum mass that can hang without sinking from a 50 cm diameter styrofoam sphere in water? (Assume the volume of the mass is negligible compared to that of the sphere.) V sphere = r^34/3 pie
Monday, January 25, 2016 by luma

physics
A 10 cm by 10 cm by 10 cm wood block with a density of 700 kg/m^3 floats in water. a. What is the distance from the top of the block to the water if the water is fresh? b. If it's seawater?
Monday, January 25, 2016 by luma

physics
A cargo barge is loaded in a saltwater harbor for a trip up a freshwater river. If the rectangular barge is 3 m by 20 m and sits 0.8 m deep in the harbor, how deep will it sit in the river?
Monday, January 25, 2016 by luma

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 = +0.8 m/s and ax = +0.9 m/s2. The y components of the puck's initial velocity and acceleration are ...
Monday, January 25, 2016 by Adriana

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

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Homework Help: Science