Wednesday
December 7, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
Why does the force of gravity change the speed of a satellite in an elliptical orbit? 1)The force of gravity is always tangent to the satellite motion. 2)Gravity speeds up the satellite as it moves away and slows it on its return. 3)The force of gravity is always perpendicular...
Friday, October 7, 2016 by dave

Physics
Abody is released from a height of 20m above the ground. Find it's height above the ground when it's velocity is 10m/s
Friday, October 7, 2016 by Yawe Akram

physics
An airplane accelerates down a runway at 3.33 m/s2 for 35.3 s until is finally lifts off the ground. Determine the distance traveled before takeoff.
Friday, October 7, 2016 by Anonymous

Physics
An asteroid has a mass of 3.66 x 10^20 kg and a radius of 8.2 x 10^5 m. If a 25 kg mass is dropped fro 10 m above the "ground" of the asteroid, how long will it take the mass to fall to the ground?
Friday, October 7, 2016 by sam

physics
A semi circular rail of horizontal diameter AB=2R is placed in a vertical plane. Two particles S1 and S2 of respective masses m1 and m2 (m1 <m2) slide without friction on the inner surface of this rail. A) Particle S1 is released at point B without initial velocity ....
Friday, October 7, 2016 by vicky

physics
An 8000 kg elevator is supported by a steel cable. If the acceleration of the elevator is 1.4 m/s^2 upward, then find the tension in the cable.
Friday, October 7, 2016 by sam

Physics
two campers in a national park hike from their cabin to the same spot on a lake each taking a different path. the total distance traveled along path 1 is 7.5 km and that along path 2 is 8.2 km. what is the final displacement of each camper?
Friday, October 7, 2016 by Jay

Physics
The density of copper is 9.8×10^3 and the density of gold is1.9×10^4. When the two wires of these two metals are held under the same tension the speed in the gold wire is found to be half of that of the copper. What is the ratio of the diameters of the two wires?
Friday, October 7, 2016 by Frank

Physics
Three equal masses are suspended from a frictionless, massless pulley system, as shown. Once the system has reached equilibrium, 1) what angles will the strings make with respect to the horizontal
Friday, October 7, 2016 by Anonymous

Physics
An object with a weight of 150 N hangs from the ceiling as shown in the figure. 1) Find the tension in each string. q1 = 60 degree and q2 = 45 degree
Friday, October 7, 2016 by Anonymous

Physics
The figure shows an Atwood machine (a wheel suspended from the ceiling with two masses connected by a string) with m1 = 1.0 kg and m2 = 1.1 kg. If m2 descends a distance 3m from rest in 3.6 seconds. 1) what is the strength of the gravitational field, g, at this location (N.B. ...
Friday, October 7, 2016 by Anonymous

physics
A plane flies at 150m/s at 35 degrees east of north. It encounters a wind from the west blowing 26 m/s. What is the true course of the plane? (speed and direction)
Friday, October 7, 2016 by JD

physics
A plane flies at 150m/s at 35 degrees east of north. It encounters a wind from the west blowing 26 m/s.
Friday, October 7, 2016 by JD

Physics
If you were in an elevator what should the acceleration of the elevator be in order for you to feel what you would weigh on the martian surface(remember that acceleration is a vector, so it has both magnitude and direction)? (weight on earth=130 lbs, weight on mars=49 kg, ...
Friday, October 7, 2016 by Evette

Physics urgent pleasw
Stone is thrown vertically downward with an inital speed of 2.0m/s from height of 10m, determine time it takes to reach the bottom. Thanks!
Friday, October 7, 2016 by Mike

Physics
a) Calculate the acceleration due to gravity on the planet Mars. I found this to be about 3.7 m/sec^2 b) What would your weight be on the planet Mars if you weighed 130 lbs? c) If you could jump vertically 5 ft on earth, how high would you be able to jump on mars? I'm just...
Thursday, October 6, 2016 by Evette

Physics
Is this logic correct? Explain why momentum is conserved when a ball bounces off the ground. My logic : The ball strikes the ground with velocity v. As it leaves the ground, its velocity is also v but in the opposite direction.. i.e -v Hence, m*v + m*(-v) = 0. So, momentum is ...
Thursday, October 6, 2016 by Gary

physics
South Carolina WR Alshon Jeffery destroys the defense and makes the catch on the Hail Mary pass and dives into the endzone for the TD. (Intermediate Level) Assuming he ran at a constant velocity what is the minimum velocity Alshon would have had to run in order to make it to ...
Thursday, October 6, 2016 by joe

Physics
A cute puppy walks 20 m at 30 degrees north of east and then continues another 45 m at 15 degrees south of east. Find the magnitude of the puppy's net displacement (or the distance from the starting point)
Thursday, October 6, 2016 by Mary

optics in physics
acorridor is lighted by 4 lamps s10cm apart and suspended at a height of 5m above the centre of the floor. if each lamp gives 200cp in all directions below the horinzontal, find the illumination at the point on the floor mid-way between the second and third lamps
Thursday, October 6, 2016 by james ugbes

physics
If a vector K has component Kx = 4.1 and Ky = -13, then find the magnitude K and direction (as a positive rotation angle relative to the +x axis) of the vector.
Thursday, October 6, 2016 by Mary

physics
A constant force acts on a 5.0 kg object and reduces its velocity from 7.0 m/s to 3.0 m/s in a time of 3.0 s. Find the force.
Thursday, October 6, 2016 by Kiana

Physics
A 1.8×104 kg rocket has a rocket motor that generates 2.8×105 N of thrust. What is the rocket's initial upward acceleration? At an altitude of 5000 m the rocket's acceleration has increased to 6.3 m/s2 . What mass of fuel has it burned?
Thursday, October 6, 2016 by kitt

Physics
A loudspeaker of mass 16.0 kg is suspended a distance of h = 2.00 m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 2.90 m What is the tension T in each of the cables? Use 9.80 m/s2 for the magnitude of the acceleration ...
Thursday, October 6, 2016 by kitt

Physics
A car starts from rest on a curve with a radius of 150 m and tangential acceleration of 1.5 m/s2 Through what angle will the car have traveled when the magnitude of its total acceleration is 3.0 m/s2 ?
Thursday, October 6, 2016 by Abby

Physics
A circular track has several concentric rings where people can run at their leisure. Phil runs on the outermost track with radius rP while Annie runs on an inner track with radius rA = 0.90 rP. The runners start side by side, along a radial line, and run at the same speed in a...
Thursday, October 6, 2016 by Abby

Physics
An object with a weight of 150 N hangs from the ceiling as shown in the figure. Find the tension in each string. q1 = 60 degree and q2 = 45 degree Please help ASAP! Type the equation and then substitute the numbers in the equation
Thursday, October 6, 2016 by Anonymous

Physics
The figure shows an Atwood machine (a wheel suspended from the ceiling with two masses connected by a string) with m1 = 1.0 kg and m2 = 1.1 kg. If m2 descends a distance 3m from rest in 3.6 seconds, what is the strength of the gravitational field, g, at this location (N.B. it...
Thursday, October 6, 2016 by Anonymous

physics
A 65.2 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.08 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...
Thursday, October 6, 2016 by taylor

physics
On a frozen pond, a 13.9 kg sled is given a kick that imparts to it an initial speed of v0 = 1.81 m/s. The coefficient of kinetic friction between sled and ice is μk = 0.122. Use the work kinetic energy theorem to find the distance the sled moves before coming to rest.
Thursday, October 6, 2016 by taylor

physics
a 5cm object is placed 50cm grom a converging mirror whose focal length is 20 cm. find the position and size of the image. Draw a ray diagram.
Thursday, October 6, 2016 by kaira

Physics/Science
I'm in 7th grade and I have a writing assignment that our teacher said "do your best" as an explanation. My best would be to call out sick the rest of the year! Hear goes. Explain the scientific accomplishments of Stephen Hawking. How dis his accomplishments ...
Thursday, October 6, 2016 by Kyle

Physics
A glacier advances at 7 × 10−6 cm/s. How far will it move in 3.7 y? Answer in units of cm. Plz help! I don't get it.
Thursday, October 6, 2016 by Jina

College Physics
Two equal forces, 20 N each, gives you a resultant value of 20 N. What is the angle between the two forces?
Thursday, October 6, 2016 by Dayshae

physics
a particle which has zero rest mass and non zero energy and momentum must travel with a speed?
Thursday, October 6, 2016 by Samm

physics
How long would a car take to go from 39.3 m/s to 12.4 m/s with an acceleration of 2.8 m/s2?
Thursday, October 6, 2016 by nat

physics
in tug of war there are tow teams..one team weigh 500 kg and other team weigh 600kg and the distance between them is 22 m.where will the two teams meet
Thursday, October 6, 2016 by aakanksha

physics
A ladder sits 2 meters away from the side of a house. The top of the ladder rests at 13 meters above the ground. What is the length of the ladder?
Thursday, October 6, 2016 by Anonymous

Physics
Using a simply pulley/rope system, a crewman on an Arctic expedition is trying to lower a 6.17-kg crate to the bottom of a steep ravine of height 23.8 meters. The 55.6-kg crewman is walking along holding the rope, being careful to lower the crate at a constant speed of 1.50 m/...
Thursday, October 6, 2016 by Morgan

Physics
As a hiker in Glacier National Park, you are looking for a way to keep the bears from getting at your supply of food. You find a campground that is near an outcropping of ice from one of the glaciers. Part of the ice outcropping forms a 31.5° slope up to a vertical cliff. ...
Thursday, October 6, 2016 by Morgan

Physics
A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.2 m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak?
Thursday, October 6, 2016 by dave

Physics
What is the escape speed of an electron launched from the surface of a 1.5 cm diameter glass sphere that has been charged to 10 nC? Which equation(s) would I use?
Thursday, October 6, 2016 by Brittany

physics
a body is moving along +xaxis with uniform acceleration of-4ms2 its velocity at x=0 is 10ms-1 the time taken by the body to reach a point at x=12m is?
Thursday, October 6, 2016 by meghana

physics
A gas occupies 20 dm³at 30°c at 2.5 atm find its volume ayt s.t.p.
Thursday, October 6, 2016 by dua

physics
a ball rolls off the edge of a tabletop 1m above the floor and strikes the floor at a point 1.5m horizontally from the edge of the table. Find the (a) time of flight (b) initial velocity, (c) final velocity just before it strikes the floor. Plsssss help
Thursday, October 6, 2016 by Katty

Physics
Suppose your car was mired deeply in the mud and you wanted to use the method illustrated in the figure below to pull it out. (a) What force would you have to exert perpendicular to the center of a rope to produce a force of 14,500 N on the car if the angle is θ = 2.60&...
Wednesday, October 5, 2016 by Anonymous

Physics
When an 84.7 kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.00E+3 J. By how much does the potential energy of a 17.3 kg child increase when the child climbs a normal staircase to the second floor?
Wednesday, October 5, 2016 by Ashley

Physics
What are some scientific questions that can be asked about projectile motion?
Wednesday, October 5, 2016 by Anonymous

Physics
Suppose a 356–g kookaburra (a large kingfisher bird) picks up a 65.0–g snake and raises it 2.30 m from the ground to a branch. How much work did the bird do on the snake? How much work did it do to raise its own center of mass to the branch?
Wednesday, October 5, 2016 by Ashley

Physics
An object is shot upwards, from the ground, with an initial velocity of 120 m/s. How high will it be after 4.0s?
Wednesday, October 5, 2016 by Student

Physics
An object, initially at rest, is subject to an acceleration if 34 m/s^2. how long will it take for that object to travel 3400m
Wednesday, October 5, 2016 by Student

Engineering/Physics
When gasoline is burned in the cylinder of an​ engine, it creates a high pressure that pushes on the piston. If the pressure is 150 ​pound-force per square​ inch, and it moves the 3​-inch diameter piston a distance of 6 centimeters in 0.1 ​seconds...
Wednesday, October 5, 2016 by John

physics
What two facts did Newton need to be able to calculate the acceleration of the Moon? 1) the distance to the Moon and the diameter of the Moon. 2)the time it takes the Moon to make one revolution and the distance from the Earth to the sun. 3)the diameter of the Moon and the ...
Wednesday, October 5, 2016 by Betty

Physics
a 50 kg ice skater is skating on a frozen lake where the ice has a coefficient of friction of .08. How much force is required to push her across the ice at a constant velocity?
Wednesday, October 5, 2016 by caroline

Physics
A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.2 m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak?
Wednesday, October 5, 2016 by dave

Physics
The sum of two vectors of fixed magnitudes has the greatest magnitude when the angle between these two vectors are?
Wednesday, October 5, 2016 by Anonymous

Physics
Two forces whose resultant is 100N are perpendicular to each other. If one of them makes an angle of 60° with the resultant, calculate its magnitude.
Wednesday, October 5, 2016 by Benita

physics
a simple pendulum has a period of 2.0s and an amplitude of swing 5.0cm.calculate the maximum magnitude of the acceleration of the bob
Wednesday, October 5, 2016 by joy

physics
he a body is moving in a circular track of radius 100m with a velocity 120m/s.determine the banking angle of the track (g=9.8m/s)
Wednesday, October 5, 2016 by joy

physics
A convex lens with a focal length of 20 cm is placed in front of a convex mirror with a focal length of 7.5 cm. A luminous object is placed in front of the convex lens at a distance of 40 cm from it. What is the distance between the mirror and the lens to get the object's ...
Wednesday, October 5, 2016 by Samm

Physics
A stuntman is being pulled along a rough road at a constant velocity by a cable attached to a moving truck. The cable is parallel to the ground. The mass of the stuntman is 109 kg, and the coefficient of kinetic friction between the road and him is 0.621. Find the tension in ...
Wednesday, October 5, 2016 by BrookeNeed

Physics
As a hiker in Glacier National Park, you are looking for a way to keep the bears from getting at your supply of food. You find a campground that is near an outcropping of ice from one of the glaciers. Part of the ice outcropping forms a 31.5° slope up to a vertical cliff. ...
Wednesday, October 5, 2016 by Morgan

Physics
Using a simply pulley/rope system, a crewman on an Arctic expedition is trying to lower a 6.17-kg crate to the bottom of a steep ravine of height 23.8 meters. The 55.6-kg crewman is walking along holding the rope, being careful to lower the crate at a constant speed of 1.50 m/...
Wednesday, October 5, 2016 by Morgan

Physics
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 2.15 × 104 m/s (Va) and the radius of the orbit is 5.15 × 106 m (ra). A second satellite also has a circular orbit around this same planet. The orbit of this second satellite ...
Wednesday, October 5, 2016 by Bex

Physics
A mark on the rim of a rotating circular wheel of 0.50m radius is moving with a speed 10m/s. Find its angular speed.
Wednesday, October 5, 2016 by Snehal

Physics
The mechanical force acting on a unit are of charged conductor is =? a)f=6/2ke0 b)f=6"/2ke0 c)f=6/ke0
Wednesday, October 5, 2016 by Syed

Physics
A man walks the distance of 8km in a direction of 20degrees east the walks another 6km in a direction 50degrees south east. Using vector diagrams find the magnitude and direction of the final displacement relative to the starting point.
Wednesday, October 5, 2016 by Tom

Physics
A fuzzy die (m = 0.2 kg) hangs from the ceiling of a car. When the car accelerates forward along a horizontal road, the die swings backward so the the string supporting it makes an angle of 4 degree with the vertical. 1) What is the acceleration of the car? HINT: We're not...
Wednesday, October 5, 2016 by Anonymous

Physics
A boy throws a ball straight up into the air so that it leaves his hand at 11 m/s. 1) If the ball has mass 0.15 kg and the boy's arm moved through 1.5 m as he threw the ball, then what average force did he exert on the ball? Please show it step by step along with the ...
Wednesday, October 5, 2016 by Anonymous

Physics
A golf ball with an initial angle of 34 degrees lands exactly 240 m down the range on a level course. a.) Neglecting air friction, what initial speed would achieve this result? b.) Using the speed determined in item a, find the maximum height reached by the ball. I was looking...
Wednesday, October 5, 2016 by George

physics
A boat is wrecked by waves of speed 30m/s whose successive crest are 10m apart. Calculate the speed at which the boat receives the waves.
Wednesday, October 5, 2016 by nuel

College Physics
A 1300-kg car moving on a horizontal surface has speed v=65 km/h when it strikes a horizontal coield spring and is brought to rest in a distance of 3.0m
Wednesday, October 5, 2016 by Jake

physics
what is the angle between the resultants of P + Q and P - Q where P & Q are two vectors
Wednesday, October 5, 2016 by prabir

Physics
Briefly describe the relative quantities of kinetic, gravitational potential and mechanical energy as a stone is thrown in the air vertically upward and falls to the person's hand at the same height that it left.
Tuesday, October 4, 2016 by John

Physics
An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man if a) the elevator is stationary? b) the elevator accelerates upward at 2 m/s2? c) the elevator rises with constant velocity 4 m/s? d) while rising, the elevator decelerates at 1.5 m...
Tuesday, October 4, 2016 by Anonymous

AP Physics
A 2 stage rocket launches off at an initial angle of 75 degrees above the horizontal. The rocket has a mass of 250 kg, while the stage 1 has a mass of 125 kg, and the stage 2 booster has a mass of 50 kg. At ignition the stage 1 booster gives the rocket a thrust of 34,652 N for...
Tuesday, October 4, 2016 by Anwar

Physics
A 2 stage rocket launches off at an initial angle of 75 degrees above the horizontal. The rocket has a mass of 250 kg, while the stage 1 has a mass of 125 kg, and the stage 2 booster has a mass of 50 kg. At ignition the stage 1 booster gives the rocket a thrust of 34,652 N for...
Tuesday, October 4, 2016 by Jack

Physics
A driver in a car, originally moving at 13.1 m/s, applies the brakes until the car comes to a stop. The car moves a distance of 34.1 m while braking. How much time did it take for the car to stop? Assume constant acceleration during braking.
Tuesday, October 4, 2016 by Kate

Physics
An automobile traveling along a straight road increases its speed from 67 ft/s to 85 ft/s in 180 ft. If the acceleration is constant, how much time elapses while the auto moves the 180 ft? Answer in units of s. Can you tell me the steps in doing this?
Tuesday, October 4, 2016 by An

Physics
A glacier advances at 7 × 10−6 cm/s. How far will it move in 3.7 y? Answer in units of cm. I have calculated that there are 31,449,600 seconds in a year. I multiplied 31,449,600 by 7 × 10−6 and got 2201.472. Then I multiplied that by 3.7 and got 8145....
Tuesday, October 4, 2016 by Lance

Physics
An Australian emu is running due west in a straight line at a speed of 12.8 m/s and slows down to a speed of 7.7 m/s in 7.4 s. (a) What is the direction of the bird’s acceleration? (b) Assuming that the acceleration remains the same, what is the bird’s velocity after...
Tuesday, October 4, 2016 by Sam

Physics
A bat flying in a cave emits a sound and receives its echo 0.1 s later. How far away is the cave wall? Assume the speed of sound to be 340 m/s. Answer in units of m. How do you do this?
Tuesday, October 4, 2016 by Macie

Physics
An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. How deep is the water directly below the vessel if the time delay of the echo to the ocean floor and back is 7 s? Answer in units of m. Is it 1530*7?
Tuesday, October 4, 2016 by Ken

Physics
usain bolt set the world record for the 100m dash, proving to be the fastest man in history, with a time of 9.58s. what was bolt's average speed in miles per hour? (his initial speed was 100m/9.58s I got 23.35 mph for this I need help with this. VVVVVVVVVVVVVV assume that ...
Tuesday, October 4, 2016 by James

Physics
A car accelerates from rest at 2.9 m/s^2. How much time does it need to attain a speed of 4 m/s? Answer in units of s. are you supposed to divide 2.9 by 4?
Tuesday, October 4, 2016 by Jackie

Physics
An airplane touches down at a speed of 55.0 m/s on a runway that is 600 m long. The plane can decelerate at a uniform rate of 2.50 m/s^2. Will the plane be able to stop before the end of the runway?
Tuesday, October 4, 2016 by HELP

Physics
A car will skid to a halt at a uniform rate of -9.4 m/s^2. If you measure skid marks that are 34 m long, with what speed was the car going just before the driver slammed the brakes?
Tuesday, October 4, 2016 by Dan

Physics
A rocket initially at rest accelerates at a rate of 80 m/s^2 for 0.74 min. What is its speed at the end of this time? Answer in units of m/s. Plz help and explain
Tuesday, October 4, 2016 by Jackie

physics
if 5 kg mass is suspended from an ideal spring can oscillate down. If the amplitude of oscillator is doubled . the period will be? a. Increases by factor 5 b. decreases by factor 5 c. double d. remain same
Tuesday, October 4, 2016 by Pakturk

physics
An object initially at rest on a horizontal OX axis explodes into two pieces . One piece moves just after explosion along the axis OX with a speed of 6m/s. What are the direction and the magnitude of the velocity of the second piece whose mass is three times that of the first?
Tuesday, October 4, 2016 by angy

physics
a labourer lifts 100 stone to a height of 6m in two minute.if mass of each stone be one kilogram, calculate the average power ( gravity = 10ms-² )
Tuesday, October 4, 2016 by VAIBHAV

physics
What is the constant value of gravitation ?
Tuesday, October 4, 2016 by please ans

physics
How do you find the scalar product of two vectors, A=8m along the y-axis in the negative direction and B=15m, 30 degrees from the y-axis in the first quadrant. Thanks!
Tuesday, October 4, 2016 by Timothy

physics
Consider a stationary skater of mass 60 kg. Another skater of mass 40kg rushes and holds the first at a speed of 12km/hr. Both skaters hold together and move as one system (S) with a speed V. a) Determine V. b) Determine the kinetic energy of (S) before and after collision.
Tuesday, October 4, 2016 by angy

Physics
A 625-kg racing car completes one lap in 14.3 s around a circular track with a radius of 50.0 m. The car moves at a constant speed. (a) What is the acceleration of the car? (b) What force must the track exert on the tires to produce this acceleration?
Tuesday, October 4, 2016 by Brendan

Physics
Divers in Acapalco dive from a cliff that is 60 m high. If the rocks below the cliff extend outward for 26 m, what is the minimum horizontal velocity a diver must have to clear the rocks?
Tuesday, October 4, 2016 by Brendan

Physics
An arrow is shot at 28.0 degrees above the horizontal. Its velocity is 52 m/s, and it hits the target. (a) What is the maximum height the arrow will attain? (b) The target is at the height from which the arrow was shot. How far away was it?
Tuesday, October 4, 2016 by Brendan

Physics
An airplane traveling 1004 m above the ocean at 130 km/h is going to drop a box of supplies to shipwrecked victims below. (a) How many seconds before the plane is directly overhead should the box be dropped? (b) What is the horizontal distance between the plane and the victims...
Tuesday, October 4, 2016 by Brendan

Physics
The density of an object is 1500kgm-3, the mass is 10000g find the volume
Tuesday, October 4, 2016 by Jordaine

physics
On the horizontal surface of a truck a block of mass 1kg is placed and truck is moving with acceleration 5m/sec then the frictional force on the block will be?
Tuesday, October 4, 2016 by aadithya

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Homework Help: Science