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August 2, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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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

physics
in every minute a pump draws 6 metric cubed of water from a well and issues it at a speed of 5 meters per second from the nozzle situated 4 meters above the level from which the water was drawn. find the average rate at which the pump is working. (1 metric cubed =1000kg)
Monday, May 5, 2014 at 3:46am

physics
a hot air ballon rises from the ground with a uniform acceleration. after 10 seconds the ballon has attained a height of 25 metres. if the total mass of ballon and its bucket is 250 kg, find the magnitude of the force f
Monday, May 5, 2014 at 3:42am

Astro-Physics
Imagine you are in a spaceship one million km from a black hole of mass 2×1030 kg. Initially you are flying directly away from it at a velocity of 12.8 km/s. Using the n-body approximation, what is your velocity one second later? Type your answer in metres per second?
Monday, May 5, 2014 at 1:07am

Physics
A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a distance of 450 m at ...
Sunday, May 4, 2014 at 10:02pm

Physics
8.2 kg of ice is taken from a temperature of -49 C into steam at 123 C. What is the energy used? Q_total =
Sunday, May 4, 2014 at 9:31pm

physics
A metal ball of mass 1.8 kg with initial temperature of 46.5 C is dropped into a container of 3 kg of water at 15 C. If the final temperature is 22.6 C, what is the specific heat of the metal? c_metal =____ J*kg*C?
Sunday, May 4, 2014 at 9:30pm

physics
10 kg of ice at -4 C is dropped into 15.1 kg of water at 36 C. What is the final temperature of the mixture? T_final =
Sunday, May 4, 2014 at 9:28pm

physics
12.8 kg of ice at 0 C is dropped into 3.3 kg of water at C. What fraction of the ice melts? =
Sunday, May 4, 2014 at 9:25pm

physics
A metal ball of mass 1.8 kg with initial temperature of 46.5 C is dropped into a container of 3 kg of water at 15 C. If the final temperature is 22.6 C, what is the specific heat of the metal? metal = ____ J/kg*C?
Sunday, May 4, 2014 at 9:20pm

Physics
A 0.45kgkg mass oscillates in simple harmonic motion on a spring with a spring constant of 160N/mN/m .What is the period of the oscillation?
Sunday, May 4, 2014 at 8:31pm

physics
A 0.25 kg{\rm kg} object is suspended on a light spring of spring constant 35N/mN/m . The spring is then compressed to a position 17cmcm above the stretched equilibrium position.How much more energy does the system have at the compressed position than at the stretched ...
Sunday, May 4, 2014 at 8:30pm

physics
Sunlight strikes the surface of a lake at an angle of incidence of 44.5°. At what angle with respect to the normal would a fish see the Sun?
Sunday, May 4, 2014 at 6:21pm

physics
How would a diamond look if there were no dispersion?
Sunday, May 4, 2014 at 6:20pm

physics
the length of nylon rope from which a mountain climber is suspended has a force constant of 1.40*10^4. how much would this rope stretch to break the climbers fall if he freefall 2.00 m before the rope run out of slack
Sunday, May 4, 2014 at 5:48pm

physics
If an archaeologist finds an ancient fire pit containing partially consumed firewood and the 14C content of the wood is only 10% of an equal carbon sample from present day tree, what is the age of ancient site. 14 C has half life of 5730 years
Sunday, May 4, 2014 at 5:34pm

Physics question
Does the crest of a wave usually have a larger amplitude than the trough?
Sunday, May 4, 2014 at 5:33pm

Physics
A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration?
Sunday, May 4, 2014 at 5:24pm

physics
suppose the length of a clock's pendulum is increased by 0.01 exactly at noon what time will be exactly next day by noon
Sunday, May 4, 2014 at 5:17pm

physics
A 1,500 kg car starts from rest and accelerates to a speed of 12 m/s over a distance of 68 m a) calculate the total work on the car b) calculate the net force that caused the car to accelerate (constant force)
Sunday, May 4, 2014 at 2:21pm

physics
A 3.8 kg ball is rolling along a slippery road at 1.5 m/s E. It then rolls onto a patch of grass and slows to a stop over a distance of 3.6 m a) calculate the total work on the ball b) calculate the net force that caused the ball to come to a stop (force is constant)
Sunday, May 4, 2014 at 2:20pm

Science
GCSE Physics-Forces affecting falling objects. My falling object is a skydiver Can you please help me to find the information needed? Nothing too complicated please. Here is a list of things I need to include but I have no idea where this information can be found on the ...
Sunday, May 4, 2014 at 2:18pm

physics
Question Part Points Submissions Used 1 2 3 4 0/0.37 0/0.37 –/0.37 –/0.37 4/15 1/15 0/15 0/15 Total 0/1.48 ...A diamond in air is illuminated with white light. On one particular facet, the angle of incidence is 46.05°. Inside the diamond, red light (ë = 660...
Sunday, May 4, 2014 at 2:08pm

Physics
A hiker throws a rock with a mass of 1.4kg from a cliff that is 37 m above the ground . The hiker gives the rock an initial downward velocity of 8.5 m/s. a) What is the energy of the rock at the moment the hiker releases it? b) What is the velocity of the rock at the moment it...
Sunday, May 4, 2014 at 12:39pm

Physics
A soccer player kicks a 0.43 kg ball straight up to see how far it will rise. The ball starts with a velocity of 16m/s at a height of 0.85m above the ground. It rises then falls straight down to the ground. a) what is the total energy of the ball just after it is kicked? b) ...
Sunday, May 4, 2014 at 12:37pm

physics
A diamond in air is illuminated with white light. On one particular facet, the angle of incidence is 46.05°. Inside the diamond, red light (ë = 660.00 nm in vacuum) is refracted at 17.38° with respect to the normal; blue light (ë = 470.00 nm in vacuum) is ...
Sunday, May 4, 2014 at 11:52am

physics
Sunlight strikes the surface of a lake at an angle of incidence of 44.5°. At what angle with respect to the normal would a fish see the Sun?
Sunday, May 4, 2014 at 11:47am

Science
GCSE Physics-Forces affecting falling objects. My falling object is a skydiver Can you please help me to find the information needed? Nothing too complicated please. Here is a list of things I need to include but I have no idea where this information can be found on the ...
Sunday, May 4, 2014 at 10:52am

physics
what is the magnitude and the direction of an electric field when an electron is accelrated vertically upward at a distance of 5.5 metres in 3 micro seconds?
Sunday, May 4, 2014 at 7:06am

physics
Consider a rectangular swimming pool of depth 2.3 m with a width and length of 13 m. What is the force exerted by the water on one of the sidewalls of the pool?
Saturday, May 3, 2014 at 10:15pm

physics
A 9.0 §Ù resistor and a 53.0 §Ù resistor are connected in parallel to a battery, and the current in the 9.0 §Ù resistor is found to be 1.41 A. Find the potential difference across the bat- tery.
Saturday, May 3, 2014 at 9:53pm

Physics
A construction worker is standing in a 2.6 m deep well, 3.1 m from the side of the well's wall. He tosses a hammer to a companion outside the well. If the hammer leaves his hand 1.0 m above the bottom of the well, at an angle of 35 degrees to the horizontal, what is the ...
Saturday, May 3, 2014 at 3:45pm

physics
A proton is suspended at rest in a uniform field E.Take into account gravity and determine E.
Saturday, May 3, 2014 at 11:05am

physics
What is the magnitude of the acceleration of anelectron in a 2200 N/C electric field?I want the solution to this problem.
Saturday, May 3, 2014 at 11:00am

physics
If a particle has kinetic energy K = 60 MeV when its momentum magnitude p = 100 MeV/c, what is the ratio m/me of its mass to the electron mass?
Saturday, May 3, 2014 at 9:11am

physics
Two inelastic balls of masses 2 and 3 kg are moving at the velocities 8 and 4 m/s. Find the increase of the internal energy if the first ball catches up the second one.
Saturday, May 3, 2014 at 7:39am

physics
An engine manufacturer makes the following claims: The heat input per second of the engine is 90.0 kJ at 375 K. The heat output per second is 4.0 kJ at 225 K. Do you believe these claims?
Saturday, May 3, 2014 at 6:06am

physics
1.A beam of light passes through the air and enters a diamond at an angle of incidence of 40 degrees. Use Snell’s Law to find the angle of refraction of the diamond. (Index of refraction for air is 1.00 and the index of refraction of a diamond is 2.42.) If the beam of ...
Friday, May 2, 2014 at 10:18pm

Physics
A 74.2-kg climber is scaling the vertical wall of a mountain. His safety rope is made of a material that, when stretched, behaves like a spring with a spring constant of 1.62 x 103 N/m. He accidentally slips and falls freely for 0.959 m before the rope runs out of slack. How ...
Friday, May 2, 2014 at 8:16pm

Physics
A 4.07 x 10-2-kg block is resting on a horizontal frictionless surface and is attached to a horizontal spring whose spring constant is 144 N/m. The block is shoved parallel to the spring axis and is given an initial speed of 10.5 m/s, while the spring is initially unstrained. ...
Friday, May 2, 2014 at 6:54pm

Physics
A 32.0kg crate is initially moving with a velocity that has magnitude 3.92m/s in a direction 37.0 ∘ west of north.How much work must be done on the crate to change its velocity to 5.50m/s in a direction 63.0 ∘ south of east?
Friday, May 2, 2014 at 6:50pm

physics
In the Bohr model of the atom, the ground-state electron in hydrogen has an orbital speed of 2190 km/s.The mass of an electron is 9.11×10−31kg. What is its kinetic energy?
Friday, May 2, 2014 at 6:46pm

Physics
Mountain pull. A large mountain can slightly affect the direction of “down” as determined by a plumb line. Assume that we can model a mountain as a sphere of radius R = 3.00 km and density (mass per unit volume) 2.6 × 103 kg/m3. Assume also that we hang a 0.250...
Friday, May 2, 2014 at 4:37pm

Easy physics...having trouble with part b
Moon effect. Some people believe that the Moon controls their activities. If the Moon moves from being directly on the opposite side of Earth from you to being directly overhead, by what percentage does (a) the Moon's gravitational pull on you increase and (b) your weight...
Friday, May 2, 2014 at 4:36pm

Physics- check answer please
1. A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration? a) 0.05 mm b) 5.0 mm c) 15.mm d) 20.mm e) 180 mm my answer: I got 10 mm but it is not listed as an option
Friday, May 2, 2014 at 3:49pm

Physics
When a tuning fork of unknown frequency is sounded simultaneously with a 512 Hz tuning fork, 20 beats are heard in 4.0 seconds. What are the possible frequencies of the unknown tuning fork?
Friday, May 2, 2014 at 3:49pm

PHYSICS
79X190 find (a) the net electrical charge of the nucleus, (b) the number of neutrons, (c) the number of nucleons, (d) the approximate radius of the nucleus, and (e) the nuclear density. I have already determined B and C. I only need to know the equations for A, D, and E Thank you
Friday, May 2, 2014 at 3:30pm

Physics
A 4.07 x 10-2-kg block is resting on a horizontal frictionless surface and is attached to a horizontal spring whose spring constant is 144 N/m. The block is shoved parallel to the spring axis and is given an initial speed of 10.5 m/s, while the spring is initially unstrained. ...
Friday, May 2, 2014 at 12:54pm

Physics (URGENT!!!)
A sniper fires a bullet at 120 m/s at 30° above the horizontal from the roof top of a 35 m high parking garage. If the bullet strikes the level ground beside the parking garage: a) How long was the bullet in the air? b) How far from the base of the parking garage did the ...
Friday, May 2, 2014 at 12:53pm

physics
one can determine a persons center of mass by having them recline on a plank resting on two scales. A person 2m tall lies on such a plank and the scale near her head reads 405 N and the one near her feet reads 360 N. Find the center of her mass.
Friday, May 2, 2014 at 12:46pm

Physics
A pirate captain has asked you to help him engineer a new plank to have prisoners walk overboard from. He needs the plan to fall overboard with the prisoners in order not to leave any evidence behind. He has a uniform beam of length 8m and a mass of 100kg is resting on two ...
Friday, May 2, 2014 at 12:44pm

physics
You lay a board over two wooden pegs. The board has a length of 5m and weighs 25 N. it overhangs the left peg by 1m and the right by 2m. Determine the normal force that each peg exerts on the board.
Friday, May 2, 2014 at 12:40pm

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