Sunday
July 5, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
Leroy, who has a mass of 72 kg, is skateboarding at 5.9 m/s when he smacks into a brick wall and comes to a dead stop in 0.2 s.
Wednesday, February 18, 2015 by Kimiko

Physics
Before going into orbit, an astronaut has a mass of 55 kg. After some days in orbit, a measurement determines that a force of 110 N causes her to move with an acceleration of 1.90 m/s2. What is her mass now?
Wednesday, February 18, 2015 by Koji Hasama

Physics
When you jump vertically 0.86 meters above the ground, what is your acceleration when you reach your highest point?
Wednesday, February 18, 2015 by Vincent

physics
a pendulum is 0.75 meters long and has a period of 4.17seconds is this pendulum on the earth moon or mars?
Wednesday, February 18, 2015 by nikq

physics
Paul lifts a sack weighing 245 newtons vertically from the ground and places it on a platform at a height of 0.7 meters. If he takes 10 seconds to do this task, what power has he expended during this time?
Wednesday, February 18, 2015 by t

physics
A simple harmonic oscillator executes motion whose amplitude is .20 m and it completes 60 oscillations in 2 minutes Calculate its time period and angular frequency
Wednesday, February 18, 2015 by Anonymous

physics
3 blocks with masses of 1,00; 3,00 & 4,00 are connected with strings.calculate the acceleration of the blocks and the tension in the strings.
Wednesday, February 18, 2015 by Lucky ndlovu

Calculus Physics
A particles with mass 3.7 kg moves in the x direction according to the following function: x(t)=−7+4t+3t2−4t3. (the units of each coefficient are meters, and time is measured in seconds). At time t=7.8, what is the net force acting on the particle?
Wednesday, February 18, 2015 by danny

Calculus Physics
A box and one force vector, F1 is shown. F1 = + 10 N. If the mass of the box is 3 kg, what is the magnitude and direction of a force, F2, that would need to be applied if the box was to have an acceleration of + 2 m/s 2 in the horizontal direction. (Indicate direction by ...
Wednesday, February 18, 2015 by danny

physics
a small marble of negligible dimensions and of the mass 1.1kg is placed at a point A of a smooth frictionless circular
Wednesday, February 18, 2015 by Anonymous

Physics
A box slides down a 27.7° ramp with an acceleration of 1.25 m/s². The acceleration of gravity is 9.8 m/s². Determine the coefficient of kinetic friction between the box and the ramp.
Wednesday, February 18, 2015 by Ben

Physics
A child is twirling a 0.0120-kg plastic ball on a string in a horizontal circle whose radius is 0.100 m. The ball travels once around the circle in 0.500 s. (a) Determine the centripetal force acting on the ball. (b) If the speed is doubled, does the centripetal force double...
Wednesday, February 18, 2015 by Anonymous

Physics
Suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
Wednesday, February 18, 2015 by Dean

physics
A 7.00-kg bowling ball moves at 2.15 m/s. How fast must a 2.40-g Ping-Pong ball move so that the two balls have the same kinetic energy?
Tuesday, February 17, 2015 by Michael

physics
A horizontal force of 150 N is used to push a 45.0-kg packing crate a distance of 5.75 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150-N force (b) the coefficient of kinetic friction between the ...
Tuesday, February 17, 2015 by Sierra

Physics
Suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
Tuesday, February 17, 2015 by Dean

physics
You are sitting in a car going 20 m/s relative to the ground and decide to throw a ball backwards with a velocity of 4m/s relative to your car. A person in another car behind you sees the ball moving towards him with a velocity of 2.50 m/s relative to his car. What is the ...
Tuesday, February 17, 2015 by jyothi

Physics
Two boxes, A and B, are connected to each end of a light vertical rope. A constant upward force 90.0N is applied to box A. Starting from rest, box B descends 11.0m in 3.50s . The tension in the rope connecting the two boxes is 30.0N a) What is the mass of box A? b) What is the...
Tuesday, February 17, 2015 by Jordan

Physics 202
A rail gun uses electromagnetic forces to accelerate a projectile to very high velocities. The basic mechanism of acceleration is relatively simple and can be illustrated in the following example. A metal rod of mass 10.0g and electrical resistance 0.100Ω rests on ...
Tuesday, February 17, 2015 by Tiffany

physics
with what velocity must a ball be thrown in order to achieve the height of 50 ft.? and how long will it stay in the air?
Tuesday, February 17, 2015 by rhine

Physics
Sound of a certain wavelength is coming from within a room and passing through a rectangular door (a "slit"). If the width of the doorway is twice the wavelength of the sound, what is the diffraction angle è of the sound leaving the doorway? Please show me how...
Tuesday, February 17, 2015 by Tiffany

physics
A fire helicopter carries a 664 kg bucket of water at the end of a 24.9 m long cable. Flying back from a fire at a constant speed of 44.2 m/s, the cable makes an angle of 41.6o with respect to the vertical. Determine the force of air resistance on the bucket.
Tuesday, February 17, 2015 by Brad

physics
Two blocks are connected by a lightweight cord that passes over a frictionless, massless pulley. The bottom block has a mass of 2.00 kg and the top block has mass 0.500 kg. The coefficient of kinetic friction at each sliding surface is equal to 0.10. The two blocks are release...
Tuesday, February 17, 2015 by Cali

physics
43. A block of mass 2.00 kg rests on a ramp tilted at 25.0°. Coefficients of friction for the block/ramp: μs = 0.300, μk = 0.100. A string passing over a high quality pulley connects the block with a bucket as shown below. The bucket contains sand but a hole is ...
Tuesday, February 17, 2015 by Devin

physics
38. A rock of mass 0.400 kg is released from the surface and sinks in the ocean. As the rock descends it is acted upon by three forces: gravity, buoyancy, and drag. The buoyancy is an upward force equal to half its weight. Drag from the water can be modeled by F = kv, where k...
Tuesday, February 17, 2015 by Danny

physics
21. A traffic signal of mass 25.0 kg is suspended by two cables as shown in the diagram below. Solve for the tension in each cable each of the following scenarios: (a) θ1 = θ2 = 20.0°, and (b) θ1 = 20.0°, θ2 = 30.0°.
Tuesday, February 17, 2015 by Danny

Physics
how does the value of V relate to V1 and V2?
Tuesday, February 17, 2015 by Ly

physics
Toby is jogging at a constant speed of 3 m/s along a winding path. He is accelerating even though he is going at a constant speed. how is this possible? please help..
Tuesday, February 17, 2015 by Aileen

Physics
A contestant in a winter games event pushes a 59.0 kg block of ice across a frozen lake as shown in the figure below. The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03. The block is being pushed at a direction of 23 degrees below the ...
Tuesday, February 17, 2015 by Mariah

physics
A string under a tension of 59.0 N is used to whirl a rock in a horizontal circle of radius 2.55 m at a speed of 20.0 m/s on a frictionless surface as shown in the figure below. As the string is pulled in, the speed of the rock increases. When the string on the table is 1.00 m...
Tuesday, February 17, 2015 by Anonymous

Chemistry and physics
What causes a red glow when the iron and sulphur mixture is heated?
Tuesday, February 17, 2015 by Maureen

physics
An object 5 cm high is placed at a distance of 60 cm in front of a concane mirror of focal length10cm .Find the position and size of image
Tuesday, February 17, 2015 by sumit

Physics
suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
Tuesday, February 17, 2015 by Anonymous

Physics
I'm having trouble finding the speed to the problem. My book isn't helping much either. A golfer hits a shot to a green that is elevated 2.50 m above the point where the ball is struck. The ball leaves the club at a speed of 18.7 m/s at an angle of 51.0˚ above the...
Tuesday, February 17, 2015 by Carissa

physics SOS
a 62.8 kg astronaut is floating toawrd the front of her ship at .16 m/s relative to the ship. she wishes to throw away the 2.9 kg book she was carrying. what should the speed of the book be to achive her goal?
Tuesday, February 17, 2015 by Anonymous

physics
An object travels at 5.00 m/s in the +x direction and 4.00 m/s in the +y direction. What is the magnitude of its velocity?
Tuesday, February 17, 2015 by alexis

physics
An object has a velocity of 5.00 m/s at an angle of 30.0˚ north of east. If we define east as the +x direction and north as the +y direction, what is the magnitude of vy?
Tuesday, February 17, 2015 by alexis

physics
A person walks 4.0 miles east and then makes a 50° turn to the right and walks another 2.0 miles. How far is she from her starting point?
Tuesday, February 17, 2015 by alexis

Physics
In a hydroelectric installation, a turbine delivers 1500 hp to a generator, which in turn transfers 80.0% of the mechanical energy out by electrical transmission. Under these conditions, what current does the generator deliver at a terminal potential difference of 1910 V?
Monday, February 16, 2015 by Jasmine

Physics
A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.2 V when it is delivering 26.0 W of power to an external load resistor R. (a) What is the value of R? (b) What is the internal resistance of the battery?
Monday, February 16, 2015 by Jasmine

physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 5 rotations in 20.7 seconds when twirled.
Monday, February 16, 2015 by Anonymous

physics
this website sucks--- try posting solutions to the questions that are asked or stop calling your site homework help
Monday, February 16, 2015 by annom

Physics 2
Using the diagram to the left, rank each of the given paths on the basis of the change in electric potential. Rank the largest-magnitude positive change (increase in electric potential) as largest and the largest-magnitude negative change (decrease in electric potential) as ...
Monday, February 16, 2015 by Jenna

Physics
The figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.550mg is then applied at upward angle = 19°. (a) What is the magnitude of the acceleration of the block across the floor if the friction coefficients are μs = 0.595 ...
Monday, February 16, 2015 by Uina

physics
A woman with mass of 63 kg stands at the rim of a horizontal table having a moment of inertia of 520 kg m2 and a radius of 1.5 m. The turntable is initially at rest and is free to rotate about a frictionless, vertical axis through its center. The woman then starts walking ...
Monday, February 16, 2015 by Lexus

physics
A charge of +355 μC is fixed at the center of a square that is 0.64 m on a side. How much work is done by the electric force as a charge of +7.9 μC is moved from one corner of the square to any other empty corner?
Monday, February 16, 2015 by Anonymous

physics
A police officer investigating an accident estimates that a moving car hit a stationary car at 24km/h . If the moving car left skid marks 45m long, and if the coefficient of kinetic friction is 0.71, what was the initial speed of the moving car? Express your answer using two ...
Monday, February 16, 2015 by Anonymous

physics
Starting from rest, a skier slides 100 m down a 28 ∘ slope. How much longer does the run take if the coefficient of kinetic friction is 0.17 instead of 0? Express your answer using two significant figures.
Monday, February 16, 2015 by Anonymous

physics
The handle of a 27kg lawnmower makes a 36∘ angle with the horizontal. If the coefficient of friction between lawnmower and ground is 0.66, what magnitude of force, applied in the direction of the handle, is required to push the mower at constant velocity? Express your ...
Monday, February 16, 2015 by Anonymous

physics
A skier of mass m = 55kg glides down a slope at angle theta = 32∘, as shown in the figure below. The snow is so slippery that you can neglect friction. Find the skier's acceleration. Express your answer using two significant figures. Find the force the snow exerts on...
Monday, February 16, 2015 by Anonymous

physics
Children sled down a 44m -long hill inclined at 27∘ . At the bottom, the slope levels out. If the coefficient of friction is 0.11, how far do the children slide on the level ground? Express your answer using two significant figures.
Monday, February 16, 2015 by Anonymous

Physics
Assume the distance axis is linear and da = 10.0m and db = 35.0 m. Estimate the work done by a force F in moving a 2.80 kg object from da to db.
Monday, February 16, 2015 by Arianne

Physics
One 3.30 kg paint bucket is hanging by a massless cord from another 3.30 kg paint bucket, also hanging by a massless cord, as shown in figure below. If the two buckets are pulled upward with an acceleration of 1.57 m/s by the upper cord, calculate the tension in the lower cord...
Monday, February 16, 2015 by Cody

Physics
A Gun of Mass 3.5kg fires a bullet at 320m/s. If the gun recoils with a speed of 24m/s, calculate the mass of the bullet.
Monday, February 16, 2015 by Jacob

Physics
Express the angular velocity of 36 rpm (revolutions per minute) in units of radians per second (rad/s).
Monday, February 16, 2015 by phys 220

physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 5 rotations in 20.7 seconds when twirled. 1)Calculate the centripetal acceleration of the wooden block: 2)Calculate the tension in the string acting on the ...
Monday, February 16, 2015 by phys 220

Physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 9 rotations in 20.7 seconds when twirled. a)What is the block's tangential (linear) speed? b)What is the block's angular speed?
Monday, February 16, 2015 by phys 220

Physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 9 rotations in 20.7 seconds when twirled.
Monday, February 16, 2015 by Please Help

physics
a solid X, insoluble in water, weighs 180g in air and 150g in water. what is the relative density of the solid X? it is the physics question.
Monday, February 16, 2015 by gunjan

Physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 12 rotations in 20.7 seconds when twirled. Calculate the centripetal acceleration of the wooden block: Calculate the tension in the string acting on the ...
Monday, February 16, 2015 by Anonymous

Physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 8 rotations in 20.7 seconds when twirled. What is the block's tangential (linear) speed? What is the block's angular speed?
Monday, February 16, 2015 by Anonymous

physics
Two forces of the same magnitude act at a point.the square of their resultant is 3 times the product of their magnitudes.the angle between them is?
Monday, February 16, 2015 by Anonymous

physics
a student wants to determine the coefficient of static friction and kinetic friction between a box and a plank by gradually raising one end of the plank. when the angle of inclination with the horizontal reaches 28.0, the box starts to slip and slide 2.53 m down the plank in 3...
Monday, February 16, 2015 by nicole

physics
A water (H2O) molecule consists of two hydrogen atoms and one oxygen atom. The oxygen atom is located at the origin. One hydrogen atom is between the positive x-axis and positive y-axis and the other hydrogen atom is between the negative x-axis and the positive y-axis. Each ...
Monday, February 16, 2015 by blessings

Physics
Calculate the acceleration of a plane when it changes its speed from 0m/s to 250m/s in 12 seconds
Monday, February 16, 2015 by Jinish

Physics
Angelito wanted to lose weight by dieting and exercising. One day, he only had a loaf of bread with an energy content of 2.50 x 10^5 J for his breakfast. To exercise, he lifted a 28.34kg to a height of 0.5m. How many times must he lift and lower the barbell to burn 1.25 x 10^4 J?
Monday, February 16, 2015 by Jay K Dee

physics
An unknown object with mass M slides on a smooth frictionless surface with a speed of 35.0 m/s along the x-axis. Suddenly it explodes into two pieces, P and Q, which move in different directions as shown in the figure below. Determine the final velocity of both fragments if ...
Monday, February 16, 2015 by Anonymous

physics
A hockey puck of mass m = 120 g is attached to a string that passes through a hole in the center of a table, as shown in the figure below. The hockey puck moves in a circle of radius r = 0.50 m. Tied to the other end of the string, and hanging vertically beneath the table, is ...
Monday, February 16, 2015 by jyothi

physics
The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 7.0 m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 3.3 m from ...
Monday, February 16, 2015 by jyothi

physics
Two objects, with masses m1 and m2, are originally a distance r apart. The gravitational force between them has a magnitude F. The second object has its mass changed to 4m2, and the distance is changed to r/7. What is the ratio between the magnitude of the new gravitational ...
Monday, February 16, 2015 by jyothi

physics
When you lift a bowling ball with a force of 60.7 N, the ball accelerates upward with an acceleration a. If you lift with a force of 69.3 N, the ball's acceleration is 1.99a. Calculate the weight of the bowling ball.
Sunday, February 15, 2015 by Brad

Physics
A simple pendulum has mass 1.14 kg and length 0.760 m. (a) What is the period of the pendulum near the surface of Earth? (b) If the same mass is attached to a spring, what spring constant would result in the period of motion found in part (a)?
Sunday, February 15, 2015 by Joanna

Physics 1
Monique has a mass of 46 kg and she is sitting on a swing that hangs 0.50 m above the ground. Pierre pulls the swing back and releases it when the seat is 1.40 m above the ground. How fast is Monique moving when the swing passes through its lowest point? The answer is 4.2m/s, ...
Sunday, February 15, 2015 by Brittany

Physics (BioPhysics)
You are bending your upper body forward, while your legs remain perfectly straight and their center of gravity remains over the back of your feet (see cartoon below). What is the maximum angle  you can lean forward by without tipping over? Assume that your upper body ...
Sunday, February 15, 2015 by Phillip

Physics Circular Motion
What is the maximum speed for a car to safely negotiate a 30 banked curve of 60 m radius if there is a coefficient of static friction of 0.35?
Sunday, February 15, 2015 by Jayesh

Physics Circular Motion
A 0.75-kg ball is attached to a 1.0-m rope and whirled in a vertical circle. The rope will break when the tension exceeds 450 N. What is the maximum speed the ball can have at the bottom of the circle without breaking the rope?
Sunday, February 15, 2015 by Jayesh

Physics Circular Motion
A satellite in orbit around the earth has a period of one hour. An identical satellite is placed in an orbit having a radius that is nine times larger than that of the first satellite. What is the period of the second satellite?
Sunday, February 15, 2015 by Jayesh

Physics
What is the difference in blood pressure (mm−Hg) between the top of the head and bottom of the feet of a 1.82m tall person standing vertically?
Sunday, February 15, 2015 by Anonymous

physics
When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 7.87 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?
Sunday, February 15, 2015 by prince

Physics- Momentum
A 170g cue ball is moving at 3.0 m/s when it strikes a 160g stationary numbered ball (object ball). After the collision the balls move off as shown. Determine the speed of the cue ball and the numbered (object) ball after the collision. The diagram illustrates the cue ball ...
Sunday, February 15, 2015 by Mysty

physics
What average force is required to stop a 920kg car in 7.7s if the car is traveling at 83km/h ?
Sunday, February 15, 2015 by Dre

Physics
A slide loving pig slides down a certain 21° slide in four times the time it would take to slide down a frictionless 21° slide. What is the coefficient of kinetic friction between the pig and the slide?
Sunday, February 15, 2015 by Uina

Physics
A small box is held in place against a rough wall by someone pushing on it with a force directed upward at 29.8° above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.400 and 0.320, respectively. The box slides down unless the...
Sunday, February 15, 2015 by Madison

Physics
You are given a vector in the xy plane that has a magnitude of 85.0 units and a y component of -40.0 units
Sunday, February 15, 2015 by Anonymous

physics
Calculate the extension that would be produced by a 20N force if 15N extends a spring by 3cm
Sunday, February 15, 2015 by zynell

physics
As a protest against the umpire’s calls, a baseball pitcher throws a ball straight up into the air at a speed of 20.4 m/s. In the process, he moves his hand through a distance of 1.57 m. The acceleration of gravity is 9.8 m/s 2 . If the ball has a mass of 0.147 kg, find ...
Sunday, February 15, 2015 by John

Physics
Two boys,each of mass m,are standing at the back of a flatbed trolley of mass 4m.the trolley is at rest on a frictionless horizontal surface.The boys jump off simultaneously at one of end of the trolley whith a horizontal velocity of 2m's.the trolley moves in the opposte ...
Sunday, February 15, 2015 by Rabelani

physics
The tortoise and the hare agree to a race. Of course, they are racing cars, having gotten tired of racing on foot. The tortoise, having just bought a new Mercedes AMG GT, allows the hare to have a running start in his Volkswagen Rabbit. The hare starts the race by getting up ...
Sunday, February 15, 2015 by Allie

physics
A sprinter in a race can run 100m in 11.4 seconds. If it takes him 4.2 seconds to accelerate to top speed, what is the magnitude of his acceleration? Assume that he stays at his top speed from 4.2 seconds till the end. I do not understand which kinematics equation will help, ...
Sunday, February 15, 2015 by Allie

physics
A sledge weighing 30 kg is pulled with a rope that makes 60° with the horizontal. The tension on the rope is constant and it is 37N. The sledge is moved horizontally for 13 m. There is no friction and cos(60°)=0.5 a) What is the work done by the tension on the sledge ...
Sunday, February 15, 2015 by Ashly

Physics
Calculate the components parallel and perpendicular to the plane of 150N gravitational force acting on an object on a slope at 20 degrees to the horizontal ?
Sunday, February 15, 2015 by Tatum

Physics
Calculate the horizontal and vertical components of a 280 N force pulling upwards at an angle of 33 degrees to the horizontal ?
Sunday, February 15, 2015 by Tatum

Physics
A particle moving along the x-axis has its velocity described by the function v =2t squared m/s, where t is in s. Its initial position is x = 2.8m at t = 0 s. At 2.7s , what is the particle's position?
Saturday, February 14, 2015 by Joan

physics
Galileo's first telescope used a convex objective lens with a focal length f = 1.65 m and a concave eyepiece. When this telescope is focused on an infinitely distant object, and produces an infinitely distant image, its angular magnification is +3.11. What is the focal ...
Saturday, February 14, 2015 by Samantha

physics
Because a concave lens cannot form a real image of a real object, it is difficult to measure its focal length precisely. One method uses a second, convex, lens to produce a virtual object for the concave lens. Under the proper conditions, the concave lens will form a real ...
Saturday, February 14, 2015 by Ted

Physics
If the rifle is stopped by the hunter’s shoulder in a distance of 3.16 cm, what is the magnitude of the average force exerted on the shoulder by the rifle? Answer in units of N. mass of bullet= 0.0137 kg velocity of bullet= 546 m/s to the right mass of rifle= 3.82 kg ...
Saturday, February 14, 2015 by Anonymous

Physics
Two objects of same material are travelling near you. Object A is a 1.5 kg mass traveling 13.5 m/s; object B is a 2 kg mass traveling 5 m/s. Which object would make you feel worse if you are hit by it? 1. B 2. A 3. Unable to determine 4. the same
Saturday, February 14, 2015 by Kim

Physics
A car and driver weighing 7740 N passes a sign stating “Bridge Out 27.7 m Ahead.” She slams on the brakes, and the car decelerates at a constant rate of 12.3 m/s^2. The acceleration of gravity is 9.8 m/s^2. What is the magnitude of the work done stopping the car if ...
Saturday, February 14, 2015 by Jess

Physics
How does the energy stored in a capacitor change if (a) the potential difference is doubled, and (b) the charge on each plate is doubled, as the capacitor remains connected to a battery?
Saturday, February 14, 2015 by Anonymous

physics
A batted baseball leaves the bat at an angle of 33.0∘ above the horizontal and is caught by an outfielder 380ft from home plate at the same height from which it left the bat. 1. What was the initial speed of the ball? 2. How high does the ball rise above the point where ...
Saturday, February 14, 2015 by chibest

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