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August 20, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
Bob is pulling a 30kg filing cabinet with a force of 200N , but the filing cabinet refuses to move. The coefficient of static friction between the filing cabinet and the floor is 0.80. What is the magnitude of the friction force on the filing cabinet? Express your answer to ...
Sunday, May 11, 2014 at 9:22pm

Physics HELP!!!!!!!!
Suppose 0.021 mole of an ideal monatomic gas has a pressure of 1.00 atm at 273.15 K and is then cooled at constant pressure until its volume is reduced by 41.1 %. What is the amount of work done by the gas?
Sunday, May 11, 2014 at 5:11pm

Physics
A ball with a mass of 12 g is moving at 15 m/s. It collides with a second ball with a mass of 36 g moving at 5 m/s in the same direction. After the collision, the 12-g ball moves at 6.0 m/s. How great is the change in momentum of the z36-g ball?
Sunday, May 11, 2014 at 2:06pm

physics
A car moves along an x axis through a distance of 900 m, starting at rest (at x = 0) and ending at rest (at x = 900 m). Through the first ¼ of that distance, its acceleration is +2.25 m/s2 . Through the rest of that distance, its acceleration is – 0.750 m/s2 . Find...
Sunday, May 11, 2014 at 12:49pm

physics
24 joule work is done in moving a charge of 6c between two points. Calculate potential difference between this two points.
Sunday, May 11, 2014 at 10:28am

Physics
design a pair of ear defenders and explain how they work using big idea of energy transfer
Sunday, May 11, 2014 at 7:29am

Physics
A cyclist starts from rest and coasts down a 6.5∘{\rm ^\circ} hill. The mass of the cyclist plus bicycle is 95kg{\rm kg} . The cyclist has traveled 270m{\rm m} .What was the net work done by gravity on the cyclist? How fast is the cyclist going? Ignore air resistance.
Saturday, May 10, 2014 at 8:45pm

physics- answers check
5. A magnetic field map shows a. the direction of the magnetic field. b. a few representational field lines. c. relative strength of the magnetic field. d. All of these choices are correct. my answer: d 6. Magnetic field lines a. can cross each other when the field is strong. ...
Saturday, May 10, 2014 at 7:13pm

physics- answers check
1. For a bar magnet, the magnetic field lines point a. towards the South pole. b. towards the North pole. c. always towards the magnet. d. always away from the magnet. my answer: a 2. Magnetic field lines a. are straight lines. b. are always circles. c. form continuous loops. ...
Saturday, May 10, 2014 at 7:11pm

physics
If I am standing on top of a building that is 350 ft. high and I throw a baseball off the roof at angle of 60 degrees, determine how long the ball is in the air as well as how far it lands from the building.
Saturday, May 10, 2014 at 12:23pm

College Physics
Metal sphere 1 has a positive charge of 7.00nC . Metal sphere 2, which is twice the diameter of sphere 1, is initially uncharged. The spheres are then connected together by a long, thin metal wire. What are the final charges on each sphere?
Friday, May 9, 2014 at 9:28pm

College Physics
A 3.00-cm-diameter parallel-plate capacitor with a spacing of 0.800mm is charged to 300V . What is the total energy stored in the electric field?
Friday, May 9, 2014 at 9:17pm

Physics
50.0pJ of energy is stored in a 3.00cm × 3.00cm × 3.00cm region of uniform electric field.
Friday, May 9, 2014 at 8:59pm

Physics
A baseball is thrown from the roof of 23.5m -tall building with an initial velocity of magnitude 10.0m/s and directed at an angle of 53.1∘ above the horizontal. a.What is the speed of the ball just before it strikes the ground? Use energy methods and ignore air ...
Friday, May 9, 2014 at 6:36pm

Physics
A ski tow operates on a slope of angle 14.9∘ of length 320m . The rope moves at a speed of 12.5km/h and provides power for 55 riders at one time, with an average mass per rider of 68.0kg .Estimate the power required to operate the tow.
Friday, May 9, 2014 at 6:31pm

physics
Hello! I'm studying for physics and I am stuck on this question (I have the answer): Two identical cars are travelling on a horizontal road, one of them is going at twice the speed of the other one. Both break using the same force. The slower car breaks completely after ...
Friday, May 9, 2014 at 4:09pm

Physics
A body is allowed to slide down a frictionless track freely under gravity.The track ends in a semicircular shaped part of diameter d.What should be the height(minimum) from which the body must fall so that it completes the circle?
Friday, May 9, 2014 at 8:37am

physics
If a cyclist moving with a speed of 4.9 m/s on a level road can take a sharp circular turn of radius 4 m,then what is the coefficient of friction between the cycle tyres and the road?
Friday, May 9, 2014 at 8:03am

Physics
A 10kg box is initially at rest 10m above the ground level on top of a hill. The box starts to slide down the hill and when it reaches ground level it has speed 10m/s. Was there a friction force between the box and the ground? If so how much work did the force of friction do ...
Friday, May 9, 2014 at 1:27am

Physics
As shown in the picture to the right, a ball is suspended from the ceiling by a string of negligible mass. When the ball is set into motion such that it moves in a horizontal circle at a constant speed of 1.6m/s, the tension in the string is 7.7N. What is the length of the ...
Friday, May 9, 2014 at 1:24am

Physics
Two blocks are connected by a cord passing over a small frictionless pulley. The angle is 30 degrees, and the mass of the small block is m=15kg. If the coefficient of friction between the small block and the inclined plane is .25 and the large block is accelerating down at 2m/...
Friday, May 9, 2014 at 1:23am

Physics
A 2kg begins at the top of a 1m high frictionless, inclined plane on top of a 1.5m high table. If it is loaded onto a spring with spring constant 50N/m and compressed 10 cm from equilibrium and then released, how far from the edge of the table will the block land?
Friday, May 9, 2014 at 1:21am

Physics
1. A 40Ω , 20Ω and 60Ω resistor is connected in a parallel circuit. Which resistor would have the greatest current passing through it and why? 2. A 24Ω , 8Ω and 60Ω resistor is connected in a series circuit. Which resistor would have the greatest ...
Thursday, May 8, 2014 at 8:12pm

Physics
A cannonball is hot straight up from the edge of a cliff with an initial velocity of 30m/s. A second cannonball is shot straight downward from the edge of the same cliff with an initial velocity of -30m/s. How do the speeds of the two cannonballs compare when they reach the ...
Thursday, May 8, 2014 at 7:15pm

Physics
Peter is shooting arrows at a target with a bow. The target is 10m above the arrows launch point and some distance from Peter. If the arrows are shot with initial velocity Vo at 60 degrees with respect to the ground, then they will hit the target at the highest point of their ...
Thursday, May 8, 2014 at 7:13pm

Physics
A daredevil performs a stunt in which he jumps with his motorcycle from a horizontal cliff 10m high. What must the initial velocity of the motorcycle be, in order for the stuntman to barely clear a 10m wide water canal at the base of the cliff?
Thursday, May 8, 2014 at 7:12pm

Physics
Starting from rest, a horse pull a 250-kg cart for a distance of 1,5km. it reaches a speed of 0,38m/s by the time it has walked 50,0m and then walks at constant speed.fictional force 260n.each gram of oats the horse eats releases 9kJ of energy. 10% of this can go into work the...
Thursday, May 8, 2014 at 7:09pm

Physics
A little girl is standing on a cliff and throws a ball straight down at a speed of 5m/s towards the ground below. How far has it fallen 2.0 seconds after it leaves her hand?
Thursday, May 8, 2014 at 5:49pm

Physics
A ball leaves a table with an initial horizontal velocity of 2.4m/s. The height of the table is adjustable. In two runs, the height of the table is set at 2.5m and 5.0m respectively. Assume air resistance is negligible. What is the horizontal distance between the two landing ...
Thursday, May 8, 2014 at 4:57pm

physics
A hammer is being used to pull a nail out of a horizontal board. L = 32 cm and d = 5.2 cm. If a force of 158 N is exerted horizontally as shown, calculate the force (in N) exerted by the hammer claws on the nail.
Thursday, May 8, 2014 at 4:29pm

physics
As an astronaut, you observe a small planet to be spherical. After landing on thte planet you set off, walking always straight ahead, and find yourself returning to your spacecraft from the opposite side after completing a lap of 26.5 km. You hold a hammer at a height of 1.31 ...
Thursday, May 8, 2014 at 4:29pm

Physics 270-1 Applied
A rock is thrown down with an initial speed of 30.0ft/s from a bridge to the water below. It takes 3.50s for the rock to hit the water. (a) Find the speed (in ft. /s) of the rock as it hits the water. (b) How high is the bridge above the water?
Thursday, May 8, 2014 at 3:18pm

PHYSICS PLEASE HELP QUICKLY
Multiple choice please help :) Which of the following is equivalent to one ampere? 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s
Thursday, May 8, 2014 at 1:44pm

Multiple Choice
Physics 2. Which of the following is equivalent to one ampere? (Points : 1) 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s Question 3.3. A stream of moving charges results in a current of 5.6 A. How long does 116 C of charge take to flow past a fixed point? (Points : 1) 2.0 s 5.6 s...
Thursday, May 8, 2014 at 1:34pm

Physics
If 50 ft lbs of work is done on the same spring (in part a) in order to compress it, by how much is the spring shortened? *Information on part (a) is 400 #/in is the k constant and 1.75" is the compression. 50 ft lbs = 600 in lbs equation is: 1/2 * 600" lb * 1.75&...
Thursday, May 8, 2014 at 1:26pm

Physics question help/ check my answers
The middle two question please check my answers and tell me if I am correct or if there is something I am missing. The first and the last question I need help to understand and complete it. Thank you in advance!!! 1. What is the electric force between a +2 µC point ...
Thursday, May 8, 2014 at 12:27pm

Physics
A.) How much work must be done in order to compress a spring with an elastic constant of 400 lb / in and 1.75 inches? *Note: 1.75" is the compression & 400#/in is the k constant. B.) If 50 ft lbs of work is done on the same spring (in part a) in order to compress it, by ...
Thursday, May 8, 2014 at 12:05pm

PHYSICS
How do I determine final velocity in the equation Vf^2=Vi^2 + 2ad ?
Thursday, May 8, 2014 at 11:40am

Physics
How do I get the final velocity from Vf^2 = Vi^2 + 2ad. Here are my following numbers: Vi= 0.3048 m/s Vf= ? d = 22.86 m a = 166 m/s^2 t = Not required Based on the numbers I have would I set it up this way??? Vf^2= 0.3048^2 + 2*(166*22.86) This process comes out to an ...
Thursday, May 8, 2014 at 10:49am

Physics
A.) How much work must be done in order to compress a spring with an elastic constant of 400 lb / in and 1.75 inches? *Note: 1.75" is the compression & 400#/in is k the constant. B.)If 50 ft lbs of work is done on the same spring (in part a) in order to compress it, by ...
Thursday, May 8, 2014 at 10:25am

PHYSICS
A 3.0 kg block is moved up a 37 degree incline under a constant horizontal force of 40.0 N. The coefficient of friction is 0.10 and the block is displaced 2.0 m up the incline. Calculate the change in the kinetic energy of the block.
Thursday, May 8, 2014 at 7:49am

Physics
Q: Japanese honeybees have a unique defensive mechanism against their natural predator, the giant hornet. When threatened by a hornet attacking the nest, worker bees will work together to surround the hornet, and then vibrate to create heat. If enough bees work together, the ...
Thursday, May 8, 2014 at 3:21am

physics
A 70 kg man holding a 0 . 857 kg ball stands on a frozen pond next to a wall. He throws the ball at the wall with a speed of 11 . 9 m / s (relative to the ground) and then catches the ball after it rebounds from the wall. How fast is he moving after he catches the ball? Ignore...
Wednesday, May 7, 2014 at 11:30pm

Physics
A 3.0 kg block is moved up a 37 degree incline under a constant horizontal force of 40.0 N. The coefficient of friction is 0.10 and the block is displaced 2.0 m up the incline. Calculate the change in the kinetic energy of the block.
Wednesday, May 7, 2014 at 9:12pm

physics
A 60.0 kg box is lifted straight upward by a rope, a distance of 10.0 meters, at constant speed. How much power is required to complete this task in 5.00 seconds?
Wednesday, May 7, 2014 at 7:49pm

Physics
A 3.0 kg block is moved up a 37 incline under a constant horizontal force of 40.0 N. The coefficient of friction is 0.10 and the block is displaced 2.0 m up the incline. Calculate the change in the kinetic energy of the block.
Wednesday, May 7, 2014 at 7:15pm

Physics
On a roller coaster ride the cart is 250 kg. Initially, the cart is traveling at 5 m/s at the upper level, and then 25 once it reaches the flat lower level that is 8 m off the ground. How high up is the upper level?
Wednesday, May 7, 2014 at 4:35pm

Physics
. How much heat does it take to melt 2.5 kg of lead when it is at its melting point (m.p. = 327.5°C; Hf = 2.04 × 104 J/kg)? 6.2 × 101 J 8.2 × 103 J 5.1 × 104 J 1.7 × 107 J
Wednesday, May 7, 2014 at 3:29pm

Physics
3813.75 Joules of work is being done on a 150 lb object while it is moved 75 ft across a horizontal plane, what is the final velocity if the coefficient of kinetic friction is 0.25 and the initial velocity is 1 ft / s?
Wednesday, May 7, 2014 at 2:57pm

physics
3813.75 Joules of work is being done on a 150 lb object while it is moved 75 ft across a horizontal plane, what is the final velocity if the coefficient of kinetic friction is 0.25 and the initial velocity is 1 ft / s?
Wednesday, May 7, 2014 at 2:38pm

URGENT Physics help
An attractive force of 7.2 N occurs between two point charges that are 0.10 m apart. If one charge is 4.0 µC, what is the other charge? (µC = 1.0 × 106 C) (Points : 3) 1.0 µC 2.0 µC +1.0 µC +2.0 µC Which substance is most easily ...
Wednesday, May 7, 2014 at 11:09am

Physics
A girl throws a ball at a fence 10m away. The ball is 2m from the ground when it leaves her hand with an initial velocity of v=8 i+8 j m/s. When the ball hits the fence its horizontal velocity component is reversed (the vertical velocity component is unchanged). Where does the...
Wednesday, May 7, 2014 at 10:54am

Physics
Need help with a question! I worked out A (assuming its right) which leads to B. A) C=1.03x10^-4 uF, A=2.5mm^2, d=0.75um B) If the voltage across the membrane is delta V= 75mV, what is the charge +_Q on each surface A? thanks!
Wednesday, May 7, 2014 at 8:08am

Physics
A cannonball is dropped overboard from a boat. The cannonball sinks toward the bottom of the sea. The mass of the seawater displaced by the cannonball is exactly 2/3 the mass of the cannonball. Find the velocity of the cannonball after 10 seconds after being dropped.
Wednesday, May 7, 2014 at 3:16am

physics
The gravitational field strength at 35700km above earth is .225N/kg. what is the tangental velocity of a 100000kg communication satellite? mass of earth = 5.98E24kg and radius of earth = 6.37E6m
Tuesday, May 6, 2014 at 11:32pm

physics
a 2000kg car approaches a 1000m radius curve. If the amount of friction is 1800 N and it have velocity of 30m/sec will the car be able to make the turn?
Tuesday, May 6, 2014 at 11:27pm

physics
how fast must a .11kg toy car travel at the top of a loop in toy track not to fall off if the radius of the loop is .15m?
Tuesday, May 6, 2014 at 11:25pm

Physics
A 0.50 kg pendulum is pulled back and released. When the height is 0.60 m above its equilibrium position its speed is 1.9 m/s. What is the maximum height of the pendulum?
Tuesday, May 6, 2014 at 10:41pm

Physics
A mass vibrates at the end of a horizontal spring (k=125 N/m) along a frictionless surface reaching a maximum speed of 7.0 m/s. If the maximum displacement of the mass is 85.0 cm, what is the mass?
Tuesday, May 6, 2014 at 10:30pm

Physics
The speed of a hockey puck (mass=100.0 g) decreases from 45.00 m/s to 42.68 m/s in coasting 16.00 m across the ice. a) How much thermal energy was produced? b) What frictional force was acting on the puck?
Tuesday, May 6, 2014 at 10:29pm

Physics
A 75 g arrow is fired horizontally. The bow string exerts an average of 65 N on the arrow over a distance of 0.90 m. With what speed does the arrow leave the bow string?
Tuesday, May 6, 2014 at 10:27pm

Physics
A 75 g arrow is fired horizontally. the bow string exerts an average force of 65 N on the arrow over a distance of 0.90 m. With what speed does the arrow leave the bow string?
Tuesday, May 6, 2014 at 10:24pm

Physics
A block of mass 20 g sits at rest on a plate that is at the top of the fluid on the right side of a U-tube. The U-tube contains two different fluids with densities ρ1 = 900 kg/m^3 and ρ2 = 630 kg/m^3 and has a cross sectional area A = 5.3x10^-4 m^2. The surfaces are ...
Tuesday, May 6, 2014 at 9:58pm

physics
find the moment of inertia of the earth. Radius is 6,000 km and mass is 6 x 10^24 kg
Tuesday, May 6, 2014 at 7:36pm

physics
A steel sphere of radius 6.5 mm is dropped into a lake. What is the terminal speed of the sphere?
Tuesday, May 6, 2014 at 7:18pm

physics
A block of mass 20 g sits at rest on a plate that is at the top of the fluid on the right side of a U-tube. The U-tube contains two different fluids with densities ρ1 = 900 kg/m^3 and ρ2 = 630 kg/m^3 and has a cross sectional area A = 5.3x10^-4 m^2. The surfaces are ...
Tuesday, May 6, 2014 at 7:17pm

physics
A block of mass 20 g sits at rest on a plate that is at the top of the fluid on the right side of a U-tube. The U-tube contains two different fluids with densities ρ1 = 900 kg/m^3 and ρ2 = 630 kg/m^3 and has a cross sectional area A = 5.3x10^-4 m^2. The surfaces are ...
Tuesday, May 6, 2014 at 3:18pm

Physics
A steel sphere of radius 6.5 mm is dropped into a lake. What is the terminal speed of the sphere?
Tuesday, May 6, 2014 at 2:55pm

Physics
The position of an object is described as x = 4.0t and y= 1.5t2 - 2t + 1.0. All factors are in SI-units. a) What is the begining velocity of the object? b) What is his acceleration? c) What is the direction along the x-axe at the time t=1.0 s ? Given answers are: 4.5 m/s in -...
Tuesday, May 6, 2014 at 1:09pm

physics
What is a property of metals?
Tuesday, May 6, 2014 at 11:35am

physics
Suppose an unknown substance has a melting temperature of 1,200 degrees Celsius and a density of 16.7 g/cm3. However, the different individual atoms that make up the substance have very different melting temperatures and densities. The unknown substance is most likely a
Tuesday, May 6, 2014 at 11:34am

Physics
A concave spherical mirror has a radius of curvature 15 cm. A 1 cm tall bulb is placed in front of the mirror such that its image is formed 10 cm in front of the mirror what is the focal length position of object magnification of object height of object Please help!! I am ...
Tuesday, May 6, 2014 at 11:12am

physics
Find the final speed gained by a proton when it is accelerated from rest through a potential difference of 100 volts. Also find its final kinetic energy in electron volt
Tuesday, May 6, 2014 at 10:33am

physics
A block of mass 20 g sits at rest on a plate that is at the top of the fluid on the right side of a U-tube. The U-tube contains two different fluids with densities ρ1 = 900 kg/m^3 and ρ2 = 630 kg/m^3 and has a cross sectional area A = 5.3x10^-4 m^2. The surfaces are ...
Tuesday, May 6, 2014 at 3:39am

physics
A steel sphere of radius 6.5 mm is dropped into a lake. What is the terminal speed of the sphere?
Tuesday, May 6, 2014 at 3:35am

physics
Why does the pitch of the sound produce by blowing over an open end of a bottle change when you have more water in it?
Tuesday, May 6, 2014 at 3:29am

physics
Low E on a guitar vibrates at 82.4 Hz and the guitar is 62.8 cm long. How long would the same string have to be to vibrate at high E 329.6 Hz. Assume that both strings vibrate at the fundamental frequency for the string.
Tuesday, May 6, 2014 at 3:27am

Physics
Part A Determine the energy of a photon whose absorption changes a He+ ion from the n = 1 to the n = 6 state. Determine the wavelength of a photon whose absorption changes a He+ ion from the n = 1 to the n = 6 state. Determine the frequency of a photon whose absorption changes...
Tuesday, May 6, 2014 at 12:22am

physics
Does increasing the force affect the amount of work done climbing the stairs? Does increasing the distance affect the amount of work done climbing the stairs? How would you describe the mathematical relationship between these two parameters
Monday, May 5, 2014 at 9:55pm

physics
Which of the following statements is not true about resonance? Answer It is easy to get an object to vibrate at its resonant frequencies but difficult to get it vibrate at other frequencies. A simple pendulum has many resonant frequencies called harmonics. A spring-mass system...
Monday, May 5, 2014 at 6:12pm

Physics
The angular velocity of a process control motor is (21−12t2) rad/s, where t is in seconds. A)At what time does the motor reverse direction? I got 6.5s B) Through what angle does the motor turn between t =0 s and the instant at which it reverses direction? Can anyone do B
Monday, May 5, 2014 at 5:17pm

Physics
The angular velocity of a process control motor is (21−12t2) rad/s, where t is in seconds. A)At what time does the motor reverse direction? I got 6.5s B) Through what angle does the motor turn between t =0 s and the instant at which it reverses direction? Can you help ...
Monday, May 5, 2014 at 5:09pm

Physics
What is the turntable’s angular velocity at t = 4.0s ?
Monday, May 5, 2014 at 4:57pm

physics
Stuck on this homework problem, any help would be appreciated. Thank you!! A truck has 5.9L diesel engine in it. 5.9L of the overall displacement in 6 cylinders each 102mm bore (diameter) and 120mm stroke (length). Engine operates at 16.3:1 compression ratio and with 6psi (0....
Monday, May 5, 2014 at 4:55pm

physics
A beam of electrons moving in the x-direction at 8.3Mm/s enters a region where a uniform 240G magnetic field points in the y-direction. The boundary of the field region is perpendicular to the beam. How far into the field region does the beam penetrate?
Monday, May 5, 2014 at 4:16pm

physics
Level I: If a rider accidentally releases an object when the ride is at maximum height and top speed, how far away (horizontally) would that object land, assuming negligible air resistance? If viewed from above, what would the path of that object look like?
Monday, May 5, 2014 at 4:16pm

Physics
A fisherman who lives in a high rise apartment building in Toronto, weighs a fish on a spring scale and records a 11.2 N reading. He reweighs the fish while he is in his elevator and records a reading of 13.1 N. What is the acceleration of the elevator at that moment?
Monday, May 5, 2014 at 4:16pm

Physics
Two pulleys are connected by a belt that causes one pulley to rotate (via friction) as it is driven by the first pulley. The belt turns around the pulleys without slipping on either one. rA is 10.0 cm and rB is 25.0 cm. If wheel A starts from rest and increases its rate of ...
Monday, May 5, 2014 at 3:53pm

physics
A crane slowly lifts a cement slab weighing 2,500 N to a height of 12 m. The slab is accidentally dropped. What is its KE as it hits the ground?
Monday, May 5, 2014 at 3:53pm

Physics
A wheel turns through 90.0 revolutions in 15.0 sec. The angular speed at the end of this 15.0 sec period is 10.0 rev/s. Assuming that the angular acceleration is constant, calculate a) the angular speed at the beginning of the 15.0 sec interval, and b) the amount of time that ...
Monday, May 5, 2014 at 3:53pm

Physics URGENT!!!!!!!!!!!!
An
 approaching 
train
 produces
 the
 RP1
signal
(attention
​ signal)
at
 600 Hz .
The
 train
 moves 
with
 the
speed
 of
 120 km. What
 is
 the
...
Monday, May 5, 2014 at 12:17pm

Physics URGENT!!!!!!!!!!!!
A
 bat­ watcher
 detects
 the
 sound
 of
 a
 hunting
 greater
horseshoe
 bat 
at
 76 kHz .
She
 knows
 that
 this
 species
 produces
 echolocation 
calls...
Monday, May 5, 2014 at 12:15pm

physics
An
 approaching 
train
 produces 
the 
RP1
signal
(attention​ 
signal) 
at
 600 Hz .
The 
train
 moves 
with
 the
speed
 of
 120 km/h. What
 is
 the&#...
Monday, May 5, 2014 at 11:42am

physics
An american system of communication is based on the radio frequency of 76 Hz. Compute the wavelength of theses waves and compare it to the diameter of the earth.
Monday, May 5, 2014 at 11:37am

Physics
Hello, I need an example of something that travels 7 m/sec or 10 m/sec. Any ideas?
Monday, May 5, 2014 at 11:32am

AP Physics B
how much heat does it take to melt 4.2 kg of ice at 0c? Answer in kcal
Monday, May 5, 2014 at 9:50am

physics
two children sit at opposite ends of a 60 lb. 10 ft. seesaw which is pivoted at its center one child weighs 50 lbs. and the other 75 lbs. the seesaw is uniform so that its center of gravity is at its geometric center, which also is its pivot point. A) the force exerted by the ...
Monday, May 5, 2014 at 7:18am

physics
a particle of mass m moving with a speed v meters per second strikes a particle of mass 3m at rest and joins together. express the final kinetic energy as a fraction of initial energy
Monday, May 5, 2014 at 4:04am

physics
when a force of 0.245 newtons is applied to a body of mass 250g which is resting on a horizontal plane, the body is found to be in a limiting equilibrium. find the coefficient of friction between body and planes.
Monday, May 5, 2014 at 3:58am

physics
a body of mass 5kg falls vertically against a resistance of x Newtons.The body passes through two points A and B, 2.5 METERS APART with A above B, WHEN TRAVELING WITH SPEED 2 METERS PER SECOND AND 6 METERS PER SECOND RESPECTIVELY. BY ENERGY CONSIDERATION , FIND THE VALUE OF X.
Monday, May 5, 2014 at 3:55am

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