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February 7, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics: Static Equilibrium
Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of è with the wall. The right-hand cable had tension 960 N and makes an angle of è1 with the ceiling. a) What is the angle è1 which the ...
Monday, November 16, 2015 by Adrian

PHYSICS
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 5.70 m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water?
Monday, November 16, 2015 by Anonymous

Physics
A ball rolls over the edge of a table with a horizontal velocity v m/s. the height of the table is 2.1m and the horizontal range of the ball from the base of the table is 16m. What is the initial speed of the ball?
Monday, November 16, 2015 by DaiAna

physics
Assume a cyclist of weight mg can exert a force on the pedals equal to 0.90 mg on the average. If the pedals rotate in a circle of radius 18 cm, the wheels have a radius of 34 cm, and the front and back sprockets on which the chain runs have 42 and 19 teeth respectively (Fig. ...
Monday, November 16, 2015 by physics

PHYSICS
A dentist's chair with a patient in it weighs 2180 N. The output plunger of a hydraulic system begins to lift the chair, when the dentist's foot applies a force of 73.6 N to the input piston. Neglect any height difference between the plunger and the piston. What is the...
Monday, November 16, 2015 by Anonymous

Physics: Static Equilibrium
Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of è with the wall. The right-hand cable had tension 960 N and makes an angle of è1 with the ceiling. a) What is the angle è1 which the right...
Monday, November 16, 2015 by Adrian

Physics 1111 at UGA
If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is one third the escape speed?
Monday, November 16, 2015 by Merritt

Physics
A chameleon extends its tongue to capture a tasty insect. The tongue accelerates at 33 m/s2 for 0.12 seconds to make the capture. what is the speed of the chameleons tongue when it grabs the insect?
Monday, November 16, 2015 by anonymous

Physics
Suppose you measure a standing person's blood pressure by placing the cuff on his leg 0.580 m below the heart. Calculate the pressures you would observe if the pressures at the heart are 121 over 80 mm Hg. Assume there is no loss of pressure due to resistance in the ...
Monday, November 16, 2015 by Kenzie

physics
A cross-country skier who weighs 600 N has chosen ski wax that provides ฯ=0.03. What is the minimum amount of horizontal force,perhaps from a tailwind,that would keep the skier coasting at constant speed across level snow?
Monday, November 16, 2015 by sarah

Physics
A bicycle with tires 64 cm in diameter travels 5.2 km . Part A How many revolutions do the wheels make? Express your answer using two significant figures.
Monday, November 16, 2015 by Safia

Physics
The interior of a submarine located at a depth of 50 m in seawater is maintained at sea-level atmospheric pressure. Find the force acting on a window 20 cm square. The density of seawater is 1.03 × 103 kg/m3
Monday, November 16, 2015 by peter

physics
70-kg man jumps off a raft 2 meter squared moored in a freshwater lake. By how much does the raft rise?
Monday, November 16, 2015 by yin

AP physics 1
an astronaut on a space walk discovers that this jet pack has no longer works, leaving him stranded 50m from the space-craft. If the jet pack is removable, explain how the astronaut can still use it to return to the ship?
Sunday, November 15, 2015 by lakpa

Physics: Static Equilibrium
Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of θ with the wall. The right-hand cable had tension 960 N and makes an angle of θ1 with the ceiling. a) What is the angle θ1 which the right- hand...
Sunday, November 15, 2015 by Adrian

Physics
Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of θ with the wall. The right-hand cable had tension 960 N and makes an angle of θ1 with the ceiling. a) What is the angle θ1 which the right- hand...
Sunday, November 15, 2015 by Adrian

Physics HELP
How would I solve this problem? A plane travels 4300 m at an angle of 49 degrees to the ground, then changes direction and travels 6500 m at an angle of 21 degrees to the ground. What is the magnitude and direction of the planes tot displacement?
Sunday, November 15, 2015 by Anonymous

Physics
if your plane is flying 25° north of east at the speed of 820 kg per hour how fast is it moving to the north?
Sunday, November 15, 2015 by Karlie

physics
When a wood shelf of mass 7.2 kg is fastened inside a slot in a vertical support as shown in (Figure 1) , the support exerts a torque on the shelf. Assume that the slot exerts two vertical forces on the shelf, at points A and B. Detrmine the force exerted on the shelf by the ...
Sunday, November 15, 2015 by Anonymous

physics
When a wood shelf of mass 7.2 kg is fastened inside a slot in a vertical support as shown in (Figure 1) , the support exerts a torque on the shelf. Assume that the slot exerts two vertical forces on the shelf, at points A and B.
Sunday, November 15, 2015 by Anonymous

physics
An airplane is travelling at a speed of 600 mph on a heading of 345 degrees. There is a wind moving at a speed of 70 mph on a heading of 20 degrees. The pilot would like to maintain his planned course. Find the speed and heading he should set in order to travel with the wind ...
Sunday, November 15, 2015 by johnny

Physics HELP
A bug on a picnic table travels 10 cm east, then 18 cm northward, and finally 20 cm westward. What is the bugs displacement relative to its original position?
Sunday, November 15, 2015 by Anonymous

Physics
A thin spherical shell of silver has an inner radius of 8.74 x 10-2 m when the temperature is 29.4 °C. The shell is heated to 145 °C. Find the change in the interior volume of the shell.
Sunday, November 15, 2015 by Kevin

physics
A car travels 15km northwards. 5km eastwards, 10km southwards, and 5km westwards to arrive at point P. Find its total displacement
Sunday, November 15, 2015 by Benny

Physics
a crane holds a 500kg wrecking ball in place using a wire with tension T1 and is horizontal to the ground. The crane swings it with a cable under tension T2. if the wire holds the ball in place so the cable forms a 20 degree angle with the vertical, determine tensions T1 and T2.
Sunday, November 15, 2015 by Drew

Physics
A man moves due north 6km then he moves 4km due west and then moves 4km southwards finally he moves 4km eastwards.Find his: total distance and displacement
Sunday, November 15, 2015 by Nonso

Physics 1
A car manufacturer claims that you can drive its new vehicle across a hill with a 47 degree slope before the vehicle starts to tip. If the vehicle is 2.0 meter wide, how high is its center of gravity?
Sunday, November 15, 2015 by Chris

Physics
If the magnetic field in a traveling EM wave has a peak value of 17.9nT, what is the peak value of the electric field strength?
Sunday, November 15, 2015 by Anonymous

physics
Hello I'm having trouble with this physics question: You are examining the loss in intensity as light passes through a fibre optic cable. The input intensity is measured as 55.1 W/m2 and the output intensity as 28.7 W/m2. Calculate the attenuation of the signal in decibels...
Sunday, November 15, 2015 by diana

Physics
A car starts rolling down a 1-in-6 hill (1-in-6 means that for each 6 m traveled along the road, the elevation change is 1 m). How fast is it going when it reaches the bottom after traveling 70 m ? Assume an effective coefficient of friction equal to 0.10
Sunday, November 15, 2015 by Emily

Physics
A roller coaster reaches the top of the steepest hill with a speed of 7.0 km/h . It then descends the hill, which is at an average angle of 44 ∘ and is 30.0 m long. Estimate its speed when it reaches the bottom. Assume μk=0.18.
Sunday, November 15, 2015 by Emily

physics help plz :)
A bicycle spins 10 revs in 5.7 sec. The radius of the wheel is 15 cm a drop of water is 0.3 grams. What height will the drop of water reach when it comes off the wheel?--- I know that I have to use the v=we equation and that grams need to be in kg. But I'm not sure exactly...
Sunday, November 15, 2015 by amelia

Physics
Compare the maximum speeds at which a car can safely navigate a flat, unbanked turn of radius 50.0 m in dry conditions versus snowy conditions. The coefficient of static friction in dry weather is 0.90, and in snowy weather it is 0.10. So, find the maximum speed for each ...
Sunday, November 15, 2015 by Smit

Physics
Determine the velocity of the Hubble deep space telescope while it is in orbit at a height of 598 km (5.98 x 105 m) above the earth’s surface. The earth’s radius is approximately 6.4 x 106 m. The mass of the earth is 6.0 x 1024 kg.
Sunday, November 15, 2015 by Smit

Physics
A hockey skater turns in a circular path with radius of 31.0 m while going 10.5 m/s. If he experiences a centripetal force of 565 N, what is the mass of the skater?
Sunday, November 15, 2015 by Smit

Physics
A 1450 kg car goes over a vertical hill with a radius of 64.7 m. What is the maximum velocity that will keep the car on the road as it goes over the hill?
Sunday, November 15, 2015 by Smit

physics
An ECG monitor must have an RC time constant less than 100 μs to be able to measure variations in voltage over small time intervals. If the resistance of the circuit (due mostly to that of the patient’s chest) is 1000 Ω, what is the maximum capacitance of the ...
Sunday, November 15, 2015 by carolyn

physics
A disk shaped yoyo (m=220 grams) has a 70 cm long string. The radius of the central winding peg is 2.5 mm, the outer radius of the yoyo is 5.6 cm. A) How much Torque is applied to this yoyo by the string? B) How long until the yoyo hits the bottom of the throw? C) What is the ...
Sunday, November 15, 2015 by Anonymous

Physics
A train can deccerate at 0.4 m/s. It's traveling at 160km/hr. How far in advance should it apply brakes to come to a full stop.
Sunday, November 15, 2015 by Jas

Physics
Period of moon=273 days Radius of moon =3,9x10^5 km Radius of satellite = 7200km Period of satellite=?
Sunday, November 15, 2015 by Mk

PHYSICS
A BALL IS PROJECTED VERTICALLY UPWARD FROM THE TOP OF A TOWER 60MITRE HIGH WITH A VELOCITY OF 30MITRE PER SECONDS.WHAT IS THE MAXIMUM HEIGHT ABOVE THE GROUND LEVEL?HOW LONG DOES IT TAKE TO REACH THE GROUND?
Sunday, November 15, 2015 by Anonymous

Physics
rotating space station has radius 1380 m, measured from the center of rotation to the outer deck where the crew lives. What should the period of rotation be if the crew is to feel that they weigh one-half their Earth weight?
Sunday, November 15, 2015 by Anonymous

Physics
If the specific heat of ice is 0.5 cal/g degree celsius, how much heat must be released from 5 g of water at 0 degree celsius to change it to ice at -4 degree celsius?
Saturday, November 14, 2015 by Peter

Physics
A certain amount of gas has a volume of 4000cm^3 at a temperature of 27 degree celsius and a pressure of 1.2 atmospheres. If the pressure is kept constant, find the volume of the gas if it is heated to 60 degree celsius. Please tell me what formula should I use.
Saturday, November 14, 2015 by Hera

Physics
An automobile is traveling 50 km/h². It deccerate at 5 m/s², how far will it take to travel after the brake are applied?
Saturday, November 14, 2015 by Abby

Physics
The 3.1 kg box shown below slides with a constant speed down an incline at an angle of θ = 28.0° to the horizontal. What is the coefficient of kinetic friction?
Saturday, November 14, 2015 by Mariah

Physics
Two identical small spheres of mass 2.0g are fastened to the ends of an insulating thread of length 0.60m The spheres are suspended by a hook in the ceiling from the centre of the thread. The spheres are given identical electric charges and hang in static equilibrium, with an ...
Saturday, November 14, 2015 by Ness

Physics
A piece of aluminum is attached to a string and suspended in a pool of oil with density 780 kg/m3. If the apparent weight of the aluminum is 590 N, what is the volume of the aluminum?
Saturday, November 14, 2015 by Wrenn

Physics
Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. If his arms are capable of exerting 1350 N on the vine, what is his acceleration at the point where the vine makes an angle of 45 degrees from the vertical assuming maximum speed at this point. His mass ...
Saturday, November 14, 2015 by Anonymous

Physics
A copper (shear modulus 4.2 x 1010 N/m2) cube, 0.324 m on a side, is subjected to two shearing forces, each of magnitude F = 6.93 x 10 5 N (see the drawing). Find the angle (in degrees), which is one measure of how the shape of the block has been altered by shear deformation.
Saturday, November 14, 2015 by Kevin

Math, physics
A rotating space station has radius 1380 m, measured from the center of rotation to the outer deck where the crew lives. What should the period of rotation be if the crew is to feel that they weigh one-half their Earth weight?
Saturday, November 14, 2015 by Pikka

Physics
A car of mass 1380 kg rests on a hydraulic lift with a piston of radius 0.24 m that is connected to a second piston of radius 0.029 m. If the car is just barely lifted off the ground, what is the force at the second piston? my work: 1380kg/.24m = F/.029m (1380)(.029)/.24=F F=...
Saturday, November 14, 2015 by Wrenn

physics
A boy and girl are balanced on a "massless" seesaw. The boy has a mass of 75 kg and the girl a mass of 50kg. The seesaw is 6 meters in lenght with the pivot point between them...What are the distances each child must sit relative to the pivot point?
Saturday, November 14, 2015 by Joe

physics
5kg particle is attaced at arim of arotating wheel of radius 2m. the wheel completes each revolution in 3seconds. The total moment of inertia of the sysem(I particle+I wheel) is 2kg.msquare) find A, Determine the rotational kinetic energy of the system? B, the work need to ...
Saturday, November 14, 2015 by cheru

physics
A uniform solid cylinder of mass 1kg rolls with out slipping on aflate surface at aspeed of pay/200rad/s how long will it be when they meet?
Saturday, November 14, 2015 by AAB

physics
Two satellites are monitored as they orbit the earth,satellites Y is foure times as far from earth's centre as is satellite X. IF the period of revolution of satellite X is T. WHAT IS THE PERIOD OF REVOLUTION OF OF Y?
Saturday, November 14, 2015 by barch

physics
what minimum initial velocity must aprojectile have to reach atarget at a distance of 25m away?(use g=10m/s square)
Saturday, November 14, 2015 by taru

physics
The coefficient of friction b/n the tyre of the car rotating around horizontal circular road and the road way is 0.5; whate would the minimum radius at w/c acar turn a horizontal road when its speed is 15m/s?(g=10m/s square)
Saturday, November 14, 2015 by eden

physics
The AM frequencies of a radio dial range from 550 kHz, and the FM frequencies range of 88.0 MHz to MHz. all of these radio waves travel at a speed of 3.0x10^8 m/s, what are the wavelenght ranges of a.) the aM brand b.) FM brand
Saturday, November 14, 2015 by Anonymous

physics
The AM frequencies of a radio dial range from 550 kHz, and the FM frequencies range of 88.0 MHz to MHz. all of these radio waves travel at a speed of 3.0x10^8 m/s, what are the wavelenght ranges of a.) the aM brand b.) FM brand
Saturday, November 14, 2015 by Jane

Physics
A car traveling 60km/hr accelerates at the rate of 2.0m/s2. How much time is required for the car to reach a speed of 90km/hr? can u help me with this? With solutions
Saturday, November 14, 2015 by Jamila Felarca

physics
A fast-moving superhero in a comic book runs around a circular, 70-m-diameter track five and a half times (ending up directly opposite her starting point) in 3.0 s . What is her angular speed, in rad/s?
Saturday, November 14, 2015 by Shakira

Physics
A motorist travels 160km at 80km/hr and 160km at 100km/hr. What is the average speed of the motorist for this trip? I need the step by step solution because I didnt listen to ny teacher properly
Saturday, November 14, 2015 by Michael Lawrence Dureza

physics
A circular disk of 10cm radius is charged uniformly with a total charge of Q. Find the electric field intensity at a point 20cm away from the disk along its axis
Saturday, November 14, 2015 by Anonymous

Physics
A gardener waters a lawn. the hose ejects 5*10^-4 m^3 of water per second. The area of the mouth of the hose is 5 cm^2. Find the backward force exerted on the gardener.[density of water=10^3kg/m^3]
Saturday, November 14, 2015 by Alice

physics
what do you think will happen if a blackhole and a whitehole are close to each other
Friday, November 13, 2015 by stephan

Physics
An airplane is circling an airport by traveling a horizontal circular path at a speed of 400 km/h. The bank angle of the wings is 20 degrees. What is the radius of the circular path the plane is flying? I honestly do not know where to start this. And it is an algebra-based ...
Friday, November 13, 2015 by Michael

Physics
What is the gravitational force between two identical 4,500 kg asteroids whose centers of mass are separated by 120 m?
Friday, November 13, 2015 by Dax

physics
"How far would a tennis ball (100g) go if thrown from your catapult at a height of 1m with a force of 50 N and at an angle of 50 degrees from the horizontal?"
Friday, November 13, 2015 by bisha

physics
a piece of metal of density 7800kgm-3 weighs 20N in air. Cal. The apparent weight of th metal when completely immersed in a liquid of density 830kgm-3
Friday, November 13, 2015 by David soye

Physics/Science
During a baseball game, a batter hits a pop- up to a fielder 72 m away. The acceleration of gravity is 9.8 m/s^2. If the ball remains in the air for 5 s, how high does it rise?
Thursday, November 12, 2015 by KT

Physics
The moon is a satellite that orbits the earth at a radius of 3.85 × 108 m. The mass of the earth is 5.98 × 1024 kg. What is the orbital speed of the moon?
Thursday, November 12, 2015 by Hannah

Physics 101
A carousel has a diameter of 10 m. How far (path length) does little Joey, strapped in at the very edge of the carousel, travel if the carousel is rotated through angle of 45 degrees, 45 rad and 45 rev, respectively?
Thursday, November 12, 2015 by Brittany

Physics
A 175-N box is placed on an inclined plane that makes a 20.0° angle with the horizontal. Find the component of the weight force parallel to the plane's surface.
Thursday, November 12, 2015 by Wesley

physics b
If heat Q is required to increase the temperature of a metal object from 4°C to 6°C, the amount of heat necessary to increase its temperature from 6°C to 12°C is A Q B 2 Q C 3 Q D 4Q please help me asap
Thursday, November 12, 2015 by marie

physics b
If heat Q is required to increase the temperature of a metal object from 4°C to 6°C, the amount of heat necessary to increase its temperature from 6°C to 12°C is _____.
Thursday, November 12, 2015 by marie

physics b
In a waterfall, much of the energy of the falling water is converted into heat. If all the mechanical energy is converted into heat that stays in the water, how much of a rise in temperature occurs in a 100 m waterfall? For water, c = 4.186 × 103 J/(kg • C°)
Thursday, November 12, 2015 by destiny

physics
what is heat
Thursday, November 12, 2015 by mara

physics b
You add 8950 J of heat to 174 g of iron. What is the temperature increase of the iron (c = 452 J/(kg • C°))?
Thursday, November 12, 2015 by destiny

physics b
A nail driven into a board increases in temperature. If 60% of the kinetic energy delivered by a 1.8 kg hammer with a speed of 7.8 m/s is transformed into heat that flows into the nail and does not flow out, what is the increase in temperature of an 8 g aluminum (c = 900 J/(kg...
Thursday, November 12, 2015 by destiny

physics
what is diffraction? When does it occur? Which waves will defract more when passing through an opening?
Thursday, November 12, 2015 by mara

physics
A stone is thrown from a height of 1.8 with a velocity of 29.4. How long does it take to reach its greatest height? I'm sure it has something to do with the s=ut+1/2 at squared not sure though
Thursday, November 12, 2015 by Jack

PHYSICS
A pitcher throws a curveball that reaches the catcher in 0.64 s. The ball curves because it is spinning at an average angular velocity of 350 rev/min (assumed constant) on its way to the catcher's mitt. What is the angular displacement of the baseball (in radians) as it ...
Thursday, November 12, 2015 by Anonymous

PHYSICS
John’s mass is 82.7 kg, and Barbara’s is 61.9 kg. He is standing on the x axis at xJ = +9.82 m, while she is standing on the x axis at xB = +4.83 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?
Thursday, November 12, 2015 by Anonymous

PHYSICS
Chapter 07, Problem 48 Two particles are moving along the x axis. Particle 1 has a mass m1 and a velocity v1 = +5.0 m/s. Particle 2 has a mass m2 and a velocity v2 = -7.9 m/s. The velocity of the center of mass of these two particles is zero. In other words, the center of mass...
Thursday, November 12, 2015 by Anonymous

PHYSICS
The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.0280 kg and is moving along the x axis with a velocity of +6.64 m/s. It makes a collision with puck B, which has a mass of 0.0560 kg and is initially at rest. The collision is not ...
Thursday, November 12, 2015 by Anonymous

PHYSICS
Batman (mass = 87.3 kg) jumps straight down from a bridge into a boat (mass = 680 kg) in which a criminal is fleeing. The velocity of the boat is initially +14.8 m/s. What is the velocity of the boat after Batman lands in it?
Thursday, November 12, 2015 by Anonymous

Physics
How far above the surface of the earth would you have to be before your weight is reduced by 13.52%?
Thursday, November 12, 2015 by Rebecca

Physics
Find the minimum initial speed of a projectile in order for it to reach a height of 2022 km above the surface of the earth.
Thursday, November 12, 2015 by Rebecca

maths lit,physics,life science n tourism
i don't know which career to choose can you help me ?I'm doing grade 11.
Thursday, November 12, 2015 by anita

AP Physics
A 5.86 kg block initially at rest is pulled to the right along a horizontal surface by a constant, horizontal force of 14.4 N. The coefficient of kinetic friction is 0.14. The acceleration of gravity is 9.8 m/s 2 . Find the speed of the block after it has moved 4.98 m. Answer ...
Wednesday, November 11, 2015 by Robert

Physics
A plane landing on a small tropical island has just 80 m of runway on which to stop. If its initial speed is 65 m/s, what is the maximum acceleration of the plane during landing, assuming it to be constant? Answer in units of m/s 2
Wednesday, November 11, 2015 by Kyle

Physics
What is its centripetal acceleration? Answer in units of m/s 2 .
Wednesday, November 11, 2015 by Elisabeth

Physics
An athlete swings a 2.01 kg ball horizontally on the end of a rope. The ball moves in a circle of radius 0.98 m at an angular speed of 0.44 rev/s. What is the tangential speed of the ball? Answer in units of m/s.
Wednesday, November 11, 2015 by Elisabeth

Physics
A person of mass 81.7 kg escapes from a burning building by jumping from a window situated 28.9 m above a catching net. The acceleration of gravity is 9.8 m/s^2 . If air resistance exerts a force of 123.1 N on him as he falls, determine his speed just before he hits the net. ...
Wednesday, November 11, 2015 by Anonymous

Physics
If a sprinter accelerates from rest at a constant rate of 2.0m/s/s how fast will they be running after 4.0s?
Wednesday, November 11, 2015 by phinigan

Physics
A person of mass 81.7 kg escapes from a burning building by jumping from a window situated 28.9 m above a catching net.The acceleration of gravity is 9.8 m/s^2. If air resistance exerts a force of 123.1 N on him as he falls, determine his speed just before he hits the net. ...
Wednesday, November 11, 2015 by Jordan

Physics
A car’s velocity decreases at a constant rate from 22.0m/s to 10.0m/s over a period of 3.0s. –What is the car’s average acceleration?
Wednesday, November 11, 2015 by phinigan

chemistry or physics
What is the speed of light in scientific notation?
Wednesday, November 11, 2015 by Brooke N

Physics
A train speeds up from a speed of 5 meters per second to 15 meters per second, taking 15 seconds to do so. –Find the acceleration of the train.
Wednesday, November 11, 2015 by phinigan

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Homework Help: Science