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January 30, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
A rock is thrown vertically upward from the edge of a cliff. The rock reaches a maximum height of 20.6 m above the top of the cliff before falling to the base of the cliff, landing 6.54 s after it was thrown. How high is the cliff?
Friday, February 1, 2013 at 8:10pm

Physics
Standing on a bridge, you throw a 3.0 g stone straight upward with speed of 2.5 m/s. How long does it take to return to the original position?
Friday, February 1, 2013 at 4:56pm

physics
An electron and a proton are initially very far apart (effectively an infinite distance apart). They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.40 10-11 m. What is EPEfinal - EPEinitial, which is the ...
Friday, February 1, 2013 at 4:43pm

Physics
A model airplane has a mass of .90 kg and moves at a constant speed on a circle that is parallel to the ground. Find the tension in the guideline (length = 17 m) for speeds of 19 and 38 m/s.
Friday, February 1, 2013 at 3:43pm

physics
A sonar signal of frequency 1.00 106 Hz has a wavelength of 1.40 mm in water. (a) What is the speed of the signal in water? (b) What is its period in water? (c) What is its period in air?
Friday, February 1, 2013 at 3:40pm

physics
Water waves in a lake travel 4.5 m in 1.7 s. The period of oscillation is 1.2 s. (a) What is the speed of the water waves? (b) What is their wavelength?
Friday, February 1, 2013 at 3:38pm

physics
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 19.0{\rm cm} , giving it a charge of -13.0\mu {\rm C} Find the electric field just outside the paint layer. Find the electric field 8.50{\rm cm} outside the surface of the ...
Friday, February 1, 2013 at 3:34pm

physics
An ocean wave has a length of 12.0 m. A wave passes a fixed location every 2.0 s. What is the speed of the wave?
Friday, February 1, 2013 at 3:29pm

physics
A mag lev train traveling at 180 m/s towards a rail way crossing sounds its horn with a wavelength of 0.20 m. What is the frequency of sound that people waiting at the rail way crossing hear?
Friday, February 1, 2013 at 3:05pm

Physics
If the specific volume of red brass is 0.001865 ft/3lb. What would be the density? Thanks!
Friday, February 1, 2013 at 1:50pm

physics
An airplane is flying with a velocity of 95.0 at an angle of 26.0 above the horizontal. When the plane is a distance 113 directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment. How far from the dog will the suitcase land? You can...
Friday, February 1, 2013 at 12:55pm

physics
A force of 1.35 newtons is required to accelerate a book by 1.5 meters/second2 along a frictionless surface. What is the mass of the book?
Friday, February 1, 2013 at 10:38am

physics
Comic-book superheroes are sometimes able to punch holes through steel walls. (a) If the ultimate shear strength of steel is taken to be 3.00 x 10^9 Pa, what force is required to punch through a steel plate 1.90 cm thick? Assume the superhero's fist has cross-sectional ...
Friday, February 1, 2013 at 10:36am

physics
in order to catch a fast moving softball with your bare hand doing this reduce the catching forcebecause the what
Friday, February 1, 2013 at 7:08am

physics
a frieght train rolls at the same speed but has twice as much mass its momentum is
Friday, February 1, 2013 at 7:07am

physics
find the impulse on a baqseball that is hit 80N of force in a time of 0.52 s
Friday, February 1, 2013 at 7:05am

Physics Electricity
Two identical point charges (q = 7.20 x 10^6 C) are fixed at diagonally opposite corners of a square with sides of length 0.480 m. A test charge (q0 = 2.40 x 10^8 C), with a mass of 6.60  108 kg, is released from rest at one of the empty ...
Friday, February 1, 2013 at 5:22am

Physics
potential energy well for a 2.0 kg particle (the function U(x) has the form bx2 and the vertical axis scale is set by us = 2.0 J). (a) If the particle passes through the equilibrium position with a velocity of 85 cm/s, will it be turned back before it reaches x = 15 cm? (b) If...
Friday, February 1, 2013 at 4:23am

PHYSICS
Because Earth's rotation is gradually slowing, the length of each day increases: The day at the end of 1.0 century is 1.0 ms longer than the day at the start of the century. In 93 centuries, what is the total (in hours) of the daily increases in time (that is, the sum of ...
Friday, February 1, 2013 at 2:32am

PHYSICS
Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.4 × 103 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual ...
Friday, February 1, 2013 at 2:30am

Physics
5. The ball launcher in a pinball machine has a spring that has a force constant of 1.20 N/cm . The surface on which the ball moves is inclined 10.0° with respect to the horizontal. The spring is initially compressed 5.00 cm. Find (a) the launching speed of a 100-g ball ...
Friday, February 1, 2013 at 2:30am

PHYSICS
During heavy rain, a section of a mountainside measuring 5.4 km horizontally (perpendicular to the slope) 0.80 km up along the slope, and 2.1 m deep slips into a valley in a mud slide. Assume that the mud ends up uniformly distributed over a surface area of the valley ...
Friday, February 1, 2013 at 2:13am

physics
If 3000ft/3 of air crossing an evaporator coil and is cooled from 75F to 55F, what would be the volume of air,in ft/3, exiting the evaporator coil?
Friday, February 1, 2013 at 12:52am

pre ap physics
a car with amass of 1120 kg starts from rest and accelerates to the speed of 17.5 m/s in 18.8 s. assume that the force of resistance remains constant at 402.5 N during this time. what is the average power developed by the car's engine? answer in units of W can you please ...
Friday, February 1, 2013 at 12:22am

physics
Suppose that on earth you can throw a ball vertically upward a distance of 2.39 m. Given that the acceleration of gravity on Mars is 3.80 m/s2, how high could you throw a ball on Mars? (Take the y-axis in the vertical direction, and assume that the location of your hand is at ...
Thursday, January 31, 2013 at 11:53pm

physics
The body of a 1258 kg car is supported on a frame by four springs. The spring constant of a single spring is 1.31 × 104 N/m. Four peo- ple riding in the car have a combined mass of 230 kg. When driven over a pothole in the road, the frame vibrates and for the first few ...
Thursday, January 31, 2013 at 11:06pm

Physics
Small spheres of diameter 1.00mm fall through 20 degree Celsius water at a terminal speed of 1.10 cm/s. calculate the density of the spheres.
Thursday, January 31, 2013 at 10:49pm

Physics
In the figure below, an electron is moving rightward between two parallel charged plates separated by distance d = 2.40 mm. The particle is speeding up from an initial speed of 3620 km/s at the left plate. |    ​  |...
Thursday, January 31, 2013 at 9:53pm

physics
Find the position and velocity of a particle at t = 1.92 s if the particle is initially moving east at a speed of 18.4 m/s and experiences an acceleration of magnitude 3.96 m/s2, directed west.
Thursday, January 31, 2013 at 8:23pm

Physics
If a 60 kg meteor falls to earth from a great distance. How much gravitational potential energy does it lose? (the energy PE is 0 at a great distance). What happens to this potential energy? Final-Initial=-Gmm/r-0=change in energy
Thursday, January 31, 2013 at 8:02pm

Physics
6.9kg/m3
Thursday, January 31, 2013 at 7:52pm

Physics
A block of wood (10-kg) at rest is hit by a bullet (50-g) that embeds itself in the block and causes both to now move at 2.7-m/s eastward. What is the initial velocity of the bullet?
Thursday, January 31, 2013 at 7:21pm

Physics
Two pendulums are set up side by side. One pendulum P, consists of a 0.240 kg mass that is suspended on a string that is 65.0 cm long. The other pendulum, Q, has a 0.360 kg mass that is suspended on a string that is 39.0 cm long. The two masses are pulled aside slightly and ...
Thursday, January 31, 2013 at 7:13pm

Physics
Two sinusoidal waves with the same amplitude of 9.11 mm and the same wavelength travel together along a string that is stretched along an x axis. Their resultant wave is shown twice in the figure, as valley A travels in the negative direction of the x axis by distance d = 60.0...
Thursday, January 31, 2013 at 6:48pm

Physics
Two sinusoidal waves with the same amplitude of 9.11 mm and the same wavelength travel together along a string that is stretched along an x axis. Their resultant wave is shown twice in the figure, as valley A travels in the negative direction of the x axis by distance d = 60.0...
Thursday, January 31, 2013 at 6:28pm

Physics
A soccer ball is released from the top of a smooth incline. After 3.80 s the ball travels 9.1 m. One second later it has reached the bottom of the incline. Assume the ball's acceleration is constant and determine its value ( m/s2)
Thursday, January 31, 2013 at 6:19pm

physics
A light bulb is placed 17.1 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 6.60 cm closer to the mirror. Calculate the focal length of the concave mirror.
Thursday, January 31, 2013 at 6:15pm

Physics
Two identical balls each have a charge of -7.5x10^-6C. The balls hang from identical strings that are 8‹ from the vertical because of the repulsive force between the charged balls. The balls are separated by a distance of 10cm. What is the tension in one of the ...
Thursday, January 31, 2013 at 6:00pm

Physics
Air is vibrating in a tube (closed at both ends) at its fundamental frequency of 160 Hz. If the tube is filled with helium instead, what is its fundamental frequency? Use 1020 m/s for the speed of sound in helium.
Thursday, January 31, 2013 at 5:11pm

Physics
A baseball is hit with a speed of 29.0{\rm m/s} at an angle of 44.0{\rm ^\circ} . It lands on the flat roof of a 10.0{\rm m} -tall nearby building. If the ball was hit when it was 1.4{\rm m} above the ground, what horizontal distance does it travel before it lands on the ...
Thursday, January 31, 2013 at 5:09pm

Physics
A metal sphere has a charge of -6 µC. How many excess electrons are there on the sphere?
Thursday, January 31, 2013 at 5:05pm

Physics
Two small aluminum spheres, each having mass 2.65×10−2 , are separated by 85.0 . How many electrons would have to be removed from one sphere and added to the other to cause an attractive force between the spheres of magnitude 4.00×104 (roughly four ton)? Assume...
Thursday, January 31, 2013 at 5:04pm

Physics
A 6.00 cm tall candle is placed at a distance of 30.0 cm from a double convex lens having a focal length of 15.0 cm. How tall is the image?
Thursday, January 31, 2013 at 5:01pm

Physics?
the total mass-energy of one pound of anything is about how many joules
Thursday, January 31, 2013 at 5:01pm

Physics
All I need is the formula for this. Can't remember it or what it's called, then I can solve it, thank you! The second harmonic of a guitar string has a frequency of 120 Hz. What is the length of the guitar string if the speed of the waves on the string is 110 m/s?
Thursday, January 31, 2013 at 4:56pm

Physics
A hydraulic ram is a device that uses the pressure created by a large amount of water falling a small distance to raise a portion of that water to a much greater height. It is suitable in valleys where springs feed a stream below, where farms needing irrigation are at the top ...
Thursday, January 31, 2013 at 4:54pm

physics
A hot-air balloon is rising straight up with a speed of 6 m/s. A ballast bag is released from rest relative to the balloon at 7 m above the ground. How much time elapses before the ballast bag hits the ground?
Thursday, January 31, 2013 at 4:10pm

Physics
This is a 2 part question, and I'm fine on part 1. However, for background info, here is part 1: A motorcycle racer traveling at 145km/h loses control in a corner of the track and slides across the concrete surface. The combined mass of the rider is 243kg. The steel of the...
Thursday, January 31, 2013 at 3:55pm

physics
Search: On a pleasure cruise a boat is traveling relative to the water at a speed of 5.4 m/s due south. Relative to the boat, a passenger walks toward the back of the boat at a speed of 1.4 m/s. (a) What is the magnitude and direction of the passenger's velocity relative ...
Thursday, January 31, 2013 at 3:53pm

Physics
Calculate the pH of a solution obtained by mixing 100cm3 of 0.1M HCl and 100cm3 of 0.2M NaOH
Thursday, January 31, 2013 at 3:51pm

Physics
Calculate the pH of a solution obtained by mixing 100cm3 of 0.1M HCl and 100cm3 of 0.2M NaOH
Thursday, January 31, 2013 at 3:50pm

physics
In a marathon race, Chad is out in front, running due north at a speed of 3.92 m/s. John is 92 m behind him, running due north at a speed of 4.33 m/s. How long does it take for John to pass Chad?
Thursday, January 31, 2013 at 3:33pm

physics
A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. The ball leaves the club at a speed of 16.1 m/s at an angle of 41.1° above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
Thursday, January 31, 2013 at 3:23pm

Physics
3. An astronaut lands on an alien planet. He places a pendulum (L = 0.200 m) on the surface and sets it in simple harmonic motion, as shown in this graph. Answer the following questions: a. What is the period and frequency of the pendulum’s motion? b. How many seconds out...
Thursday, January 31, 2013 at 3:07pm

Physics
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons.
Thursday, January 31, 2013 at 3:02pm

Physics
A mountain-climbing expedition establishes two intermediate camps, labeled A and B in the drawing, above the base camp. What is the magnitude Δr of the displacement between camp A and camp B?
Thursday, January 31, 2013 at 2:42pm

physics
A positively charged glass rod is brought close to a neutral sphere that is supported on a nonconducting plastic stand. Sketch the distribution of charges on the sphere if it is made of: a) Aluminum b) Non-conducting plastic
Thursday, January 31, 2013 at 2:27pm

physics
A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. The ball leaves the club at a speed of 16.1 m/s at an angle of 41.1° above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
Thursday, January 31, 2013 at 2:19pm

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 ...
Thursday, January 31, 2013 at 1:46pm

Math/Physics
Two identical tuning forks have frequencies of 512 Hz. If one is held by a listener while the other approaches at a speed of 7.2 m/s, what does the listener hear?
Thursday, January 31, 2013 at 1:34pm

physics
From her bedroom window a girl drops a water-filled balloon to the ground, 3.3 m below. If the balloon is released from rest, how long is it in the air?
Thursday, January 31, 2013 at 12:43pm

physics
When water freezes, it expands about 8.60%. What would be the pressure increase inside your automobile engine block if the water in it froze? The bulk modulus of ice is 2.00 * 10^9 N/m2.
Thursday, January 31, 2013 at 12:27pm

physics
dipole consisting of charges 300 apart, is placed between two very large (essentially infinite) sheets carrying equal but opposite charge densities of 140
Thursday, January 31, 2013 at 11:33am

Physics
how much heat energy needed to convert 125g ice 27 deg C to 50 deg C
Thursday, January 31, 2013 at 11:23am

Physics
How much energy is released when 1 gram of steam condenses to water at 100 degrees Celsius?
Thursday, January 31, 2013 at 10:50am

Physics
what is the number of grams of steam at 100 degrees C that will condense as 5g of ice at 0 degrees C melts?
Thursday, January 31, 2013 at 10:44am

physics
if 8100 calories are released from 200g of steam at 100C, how much of the steam condenses?
Thursday, January 31, 2013 at 10:40am

PHYSICS
WHAT IS OSMOSIS,MATTER,DIFFUSION AND GAS LAW
Thursday, January 31, 2013 at 7:49am

physics
The relative Density of an alloy is 65.(a) find the mass of a solid alloy cube of side 20cm.(b) what vol of the alloy has a mass of 13kg? Please explain in details
Thursday, January 31, 2013 at 6:17am

Physics
A communcations satellite of mass 200kg is in circular orbit of radis 4x10^4 km measured from the center of the earth. What is the gravitational force on the satellite and what fraction is this of its weight on the surface of the earth?
Thursday, January 31, 2013 at 5:04am

physics
A body is allowed to fall from rest through a vertical height of 8.45 m. Gravitational acceleration is 9.8 mis2. Calculate the velocity of the body at the end of the fall.
Thursday, January 31, 2013 at 4:06am

physics
heading due north at 6.00 m/s relative to the water. The local ocean current is 1.53 m/s in a direction 40° north of east. What is the velocity of the ship relative to the earth?
Thursday, January 31, 2013 at 2:29am

Physics
A proton collides head on with a helium atom at rest. Their combined velocity after the collision is 8 x 10^5 ms^-1. Calculate the initial velocity of the proton. *** HELP PO PLEASE!!
Thursday, January 31, 2013 at 1:28am

Physics
A proton collides head on with a helium atom at rest. Their combined velocity after the collision is 8 x 10^5 ms^-1. Calculate the initial velocity of the proton. *** HELP PO PLEASE!!
Thursday, January 31, 2013 at 1:27am

Physics
A proton collides head on with a helium atom at rest. Their combined velocity after the collision is 8 x 10^5 ms^-1. Calculate the initial velocity of the proton. *** HELP PO PLEASE!!
Thursday, January 31, 2013 at 1:26am

Physics
At the bow of a ship on a stormy sea, a crewman conducts an experiment by standing on a bathroom scale. In calm waters, the scale reads 180 lb. During the storm, the crewman finds a maximum reading of 235 lb and a minimum reading of 132 lb. Find the maximum upward acceleration...
Wednesday, January 30, 2013 at 11:35pm

Physics
If the seventh and fourth standing wave frequencies of a string differ by 144 Hz, what is the fundamental frequency of the string?
Wednesday, January 30, 2013 at 10:43pm

Math/Physics
What is an expression for the standing wave that is produced by adding the two waves (2.5 cm)sin[(3.0 m-1)x - (27 s-1 )t] and (2.5 cm)sin[(3.0 m-1)x + (27 s-1)t]
Wednesday, January 30, 2013 at 10:29pm

Physics
The density of a gas at s.t.p is 1.3kg/m3. Find the density of the gas at -15 degree celcius and at a pressure of 8cmHg.
Wednesday, January 30, 2013 at 9:57pm

physics
On Mars, the acceleration due to gravity is 3.71 m/s2. How far would a rock fall in 3 s if you dropped it on Mars?
Wednesday, January 30, 2013 at 9:50pm

Physics
A vertical spring with a spring constant of 400 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 2.3 cm in bringing the block to a momentary...
Wednesday, January 30, 2013 at 9:45pm

physics
you drop a marble from rest and after 1 second its velocity is 9.8 in the downward direction-what is the velocity after falling 0.5 secs?
Wednesday, January 30, 2013 at 9:27pm

physics
a ramp was used to lift 25000kg block. block rose 2m in height traveling 30 m along the ramps surface how much uphill friction is needed to push it up the ramp at constant velocity?
Wednesday, January 30, 2013 at 9:25pm

physics
A particle has a charge of +2.2 μC and moves from point A to point B, a distance of 0.16 m. The particle experiences a constant electric force, and its motion is along the line of action of the force. The difference between the particle's electric potential energy at ...
Wednesday, January 30, 2013 at 8:10pm

physics
How long does it take light to travel through a 3.3 mm-thick piece of window glass?
Wednesday, January 30, 2013 at 8:01pm

Physics
A drag racer, starting from rest, speeds up for 393 m with an acceleration of +16.3 m/s2. A parachute then opens, slowing the car down with an acceleration of -5.51 m/s2. How fast is the racer moving 3.31E+2 m after the parachute opens?
Wednesday, January 30, 2013 at 7:51pm

Physics
A drag racer, starting from rest, speeds up for 393 m with an acceleration of +16.3 m/s2. A parachute then opens, slowing the car down with an acceleration of -5.51 m/s2. How fast is the racer moving 3.31E+2 m after the parachute opens?
Wednesday, January 30, 2013 at 7:46pm

Physics
A crate of mass 59 kg is attached to one end of a string, and the other end of the string runs over a pulley and is held by a person as in the figure below. If the person pulls with a force of 94 N, what is the crate's acceleration?
Wednesday, January 30, 2013 at 7:36pm

Physics
As a tennis ball is struck, it departs from the racket horizontally with a speed of 28.2 m/s. The ball hits the court at a horizontal distance of 19.5 m from the racket. How far above the court is the tennis ball when it leaves the racket?
Wednesday, January 30, 2013 at 6:40pm

Physics
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ...
Wednesday, January 30, 2013 at 6:19pm

Physics ~Conservation of Energy~ part 2
1.) A 500 kg roller coaster is pulled to the top of a hill 45 m high and arrives at the top with a zero speed. a) how much work has done by the vhain to pull the car to the top? b) how much potential energy does it have at the top? c)What is the total energy of the system? d) ...
Wednesday, January 30, 2013 at 6:12pm

Physics (As Level) 12 Grade
2) An aircraft lands on a runway at a speed of 40 meters per second (ms^-1) and brakes to a halt in a distance of 860m. Calculate a) The Braking time. B) The deceleration of the aircraft.
Wednesday, January 30, 2013 at 6:07pm

Physics
You have collected exactly 2800 aluminum cans for recycling, each with a mass of 13.6 g. How much energy is needed to melt them if their initial temperature is 26.2◦C? Assume the specific heat, the latent heat and the melting point of aluminum are 899 J/kg ·◦...
Wednesday, January 30, 2013 at 6:00pm

Physics
How much energy is required to change a 58 g ice cube from ice at −1◦C to steam at 101◦C? The specific heat of ice is 2090 J/kg ·◦ C and of water 4186 J/kg ·◦ C. The latent heat of fusion of water is 3.33 × 105 J/kg, its latent...
Wednesday, January 30, 2013 at 5:59pm

Physics ~Conservation of Energy~
1.) At one point in its fall, an object (m=2.5 kg.) has a kinetic energy of 5 J(joule) and a potential energy of 10 J. a) what is the total energy of the system? b) what is the velocity at this point? The object continues to another point where its potential energy is 3J(joule...
Wednesday, January 30, 2013 at 5:57pm

Physics ~Work Kinetic Energy~
1.)A ball (m 0.5 kg) starts from rest and has 300 J(joule) of work applied to it. a) what is the initial kinetic energy of the ball? b) what is the final kinetic of the ball? c) what is the final velocity of the ball? 2.)A boy is doing chin-up. If the boy does 450 N of work to...
Wednesday, January 30, 2013 at 5:50pm

Physics
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.050 s, during which time it experiences an acceleration of 390 m/s2. The ball is launched at an angle of 46° above the ground. Determine the horizontal and ...
Wednesday, January 30, 2013 at 5:38pm

Physics
A 123 g cube of ice at 0◦C is dropped into 1.9 kg of water that was originally at 81◦C. What is the final temperature of the water after after the ice melts? The latent heat of fusion of water is 3.33 × 105 J/kg . Answer in units of ◦C
Wednesday, January 30, 2013 at 5:35pm

Physics
A meteoroid is speeding through the atmosphere, traveling east at 19.0 km/s while descending at a rate of 12.9 km/s. What is its speed, in km/s?
Wednesday, January 30, 2013 at 5:35pm

physics
If two charges are a distance R apart from eachother and their force is F, what will the force be if they are moved apart to a distance of 2R?
Wednesday, January 30, 2013 at 1:53pm

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