Monday
May 30, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
A 5.0-g bullet traveling horizontally at an unknown speed hits and embeds itself in a 0.195-kg block resting on a frictionless table. The block slides into and compresses a 180-N/m spring a distance of 5.0×10^−2 m before stopping the block and bullet.
Tuesday, March 8, 2016 by Samir Patel

Physics
A wire is made of a material with a resistivity of 2.08184 × 10−8 Ω · m . It has length 4.42917 m and diameter 0.6763 mm . What is the resistance of the wire? Answer in units of Ω. Would you just use the equation R = PL /a?
Tuesday, March 8, 2016 by Jeff

Physics HW Plz help
If a wave’s third harmonic has a frequency of 24 Hz, what is its natural (fundamental) frequency and what is the frequency of H6?
Tuesday, March 8, 2016 by Student Lexi

physics
The displacement of a particle is given by S = a+bt+ct^2. Deduce the dimensions of the constants,a,b,and c appearing in the question.
Tuesday, March 8, 2016 by daniel

AP Physics
Two speakers, one directly behind the other, are each generating a 406-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Take the speed of sound to be 344 m/s.
Tuesday, March 8, 2016 by Kevin

physics
Two objects of masses m1 = 0.58 kg and m2 = 0.92 kg are placed on a horizontal frictionless surface and a compressed spring of force constant k = 300 N/m is placed between them as in figure (a) shown below. Neglect the mass of the spring. The spring is not attached to either ...
Tuesday, March 8, 2016 by sherry

physics
A 12.0-g piece of clay is launched horizontally at a 102-g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 52 N/m. The piece of clay sticks to the side of the block. If the clay-block system ...
Tuesday, March 8, 2016 by sherry

physics
A projectile is launched from ground level at an angle of 45 degrees above the horizontal with a speed of 40m/s. It is aimed straight towards a high wall that is a horizontal distance of 120m away from the launch point. a) How much time will the projectile spend in the air ...
Tuesday, March 8, 2016 by anna

Physics
Consider the hip joint. The bones are normally not in direct contact , but instead are covered with cartilage to reduce friction. The space between them is filled with synovial fluid, which reduces the friction further. Due to this fluid, the coefficient of kinetic friction ...
Tuesday, March 8, 2016 by tom

Physics grade 12
Two point charges 2uC and 8uC are placed 12 cm apart. Find the position of the point where electric field resultant will be zero
Tuesday, March 8, 2016 by Ibrahim

physics
Consider the system shown in the diagram. The pulley is a uniform cylinder with mass m3 = 0.60 kg and radius R = 4.0 cm, the other two masses are m1 = 2.5 kg and m2 = 1.0 kg, and á = 30o. Assume the rope is massless, there is no slipping of the rope on the pulley, and ...
Tuesday, March 8, 2016 by sam

Physics
Consider the hip joint. The bones are normally not in direct contact , but instead are covered with cartilage to reduce friction. The space between them is filled with synovial fluid, which reduces the friction further. Due to this fluid, the coefficient of kinetic friction ...
Tuesday, March 8, 2016 by tom

Physics
A Stone Of Mass 1kg Is Dropped From Rest From A Window 20m Above The Ground.Another Stone Of Mass 0.5kg Is Dropped From A Height Of 5m Above The Ground . If Both Stones Are Dropped At The Same Time,find The Time Interval That That Elapses Between The Two Stones Hitting The ...
Tuesday, March 8, 2016 by Lawrenty

Physics
How long must a 25 degree ramp be to slow to a momentary stop a runaway truck moving along a truly horizontal highway at 85 miles per hour
Tuesday, March 8, 2016 by Dennis

Physics
A man walks 3km E and then 4km N. What is his resultant displacement?
Tuesday, March 8, 2016 by Charles

Physics
An airplane is heading 20degree north flying at 200km/hr relative to the air. Simultaneously the wind carries the plane 10degree, east of south at the speed of 60km/hr. (a) find the velocity of the plane relative to the ground. (b) find the component (east and south) of the ...
Tuesday, March 8, 2016 by Charles

Physics
Find the vector cross product of two vectors C=2i-j and D=i+2j-3k. What is the angle between the vectors
Tuesday, March 8, 2016 by Charles

Physics
Find the magnitude of the dot product of the two vectors B=6i+j+2k, D=-1+3j. What is the angle between B and D
Tuesday, March 8, 2016 by Charles

Physics
Consider two vectors one of magnitude 3 and the other 4 unit, which of the following is not correct? We can combine these vectors to yield a resultant of. A.7 B.5 C.1 D.0
Tuesday, March 8, 2016 by Charles

Physics
If D=7i-3j+2k and E=4i+5j-3k. Deduce angle between D and E
Tuesday, March 8, 2016 by Charles

Physics
If D=7i-3j+2k. Find the magnitude of D
Tuesday, March 8, 2016 by Charles

Physics
If D=7i-3j+2k and E=4i+5j-3k. Find the scalar product of D.E
Tuesday, March 8, 2016 by Charles

Physics
Find the sum of vectors A=5m<60degree and B=6m<130degree
Tuesday, March 8, 2016 by Charles

physics
You drop a rock into a well and count the seconds before you hear a splash. If you counted 10 seconds before you heard the splash, how deep is the well?
Tuesday, March 8, 2016 by praveena

PHYSICS
1. A 15 kg child sits in a swing that is attached in ropes 1.6 m long . Find the potential energy of the child relative to his lower position when the ropes (a) are horizontal (b) vertical and (c) make 30° with the horizontal. 2. A brick of mass 1.50 kg is placed on top of...
Tuesday, March 8, 2016 by Camz

physics
If the string on a violin is 25.4cm long and produces a fundamental tone of frequency of 440Hz, by how much must it be shortened to produce a fundamental tone of frequency of 523.3Hz. is there a specific formula to follow? like, how do you know what to do?
Monday, March 7, 2016 by aaa

Physics
A body is projected such that the horizontal range is twice the maximum height of projection. Find the angle of projection; and the time of flight if the velocity of projection is 5m/s
Monday, March 7, 2016 by Charles

Physics
What is the total time of flight of an object projected vertically upwards with a speed of 30m/s? (g=10m/s^2
Monday, March 7, 2016 by Charles

Physics
A car moving with a speed of 180km/h was brought uniformly to rest by the application of the breaks in 20s. How far did the car travel after the breaks were applied?
Monday, March 7, 2016 by Coco

Physics
A particle is at x=+5m at t=0, x=-7m at t=6s and x=+2m at t=10s. Find the average velocity of the particle during the intervals. (a) t=0 and t=6s (b) t=6s to t=10s (c) t=0 to t=10s
Monday, March 7, 2016 by Coco

Physics
A ball is thrown vertically upward with a velocity of 30m/s. Determine the maximum height reached
Monday, March 7, 2016 by Vibes

Physics
An aircraft flies 800km due east and then 600km due north. Determine the magnitude of it's displacement
Monday, March 7, 2016 by Coco

Physics
It took a car driver 30min to travel a distance of 50km. What is the average speed?
Monday, March 7, 2016 by Coco

Physics
Find the electric field at a point midway between two charges of +39.5 ✕ 10-9 C and +72.0 ✕ 10-9 C separated by a distance of 31.8 cm.
Monday, March 7, 2016 by Anonymous

Physics
An object 20cm high is placed 40cm from a lens of focal length 24cm. Calculate: a) The power of the Lens? b) The distance from the lens to the position of the image?
Monday, March 7, 2016 by Joseph

physics
the surface tension Y, of liquid depends on the density,P, acceleration of gravity,g, and the height, h. use the method of dimension to derive the actual relationship between these quantities
Monday, March 7, 2016 by charles

Physics
If s=at^2+bt+c, where s is distance and t is time, what will be the correct unit of a,b,c
Monday, March 7, 2016 by Vibes

physics
a sphere of radius r moving with velocity v through a fluid experiences a retarding force f given by F=6r^yv^zn^x where n is the viscosity of the liquid. use the method of dimensions to find the values of x,y,and z.
Monday, March 7, 2016 by charles

physics
What are the charges on and the potential difference across each capacitor in the figure if V = 13.2 V?
Monday, March 7, 2016 by king

physics
A 3.30-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.204 s, what is the average force ...
Monday, March 7, 2016 by sherry

physics
A 12.0-g piece of clay is launched horizontally at a 102-g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 52 N/m. The piece of clay sticks to the side of the block. If the clay-block system ...
Monday, March 7, 2016 by sherry

physics
A 3.30-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.204 s, what is the average force ...
Monday, March 7, 2016 by sherry

Physics
A lion sees a zebra about 100 feet away. A lion can run at 50 mph and a zebra has been clocked at 40 mph. How long will it take the lion to catch the zebra? Make a table of coordinates for each. Solve by graphing.
Monday, March 7, 2016 by Carol

Physics - sound
How can one recognise the beat frequency from a graph? Why is the beat frequency equal to the difference of the frequency of the two waves?
Monday, March 7, 2016 by Hannah

physics
A 910kg object is released from rest at an altitude of 1200 km above the north pole of the earth. If we ignore atmospheric friction, with what speed does the object strike the surface of the earth?
Sunday, March 6, 2016 by Anonymous

physics
Muscles are attached to bones by means of tendons. The maximum force that a muscle can exert is directly proportional to its cross-sectional area A at the widest point. We can express this relationship mathematically as F~max= σA, where σ (sigma) is a proportionality...
Sunday, March 6, 2016 by tom

Physics
A small 0.50 kg object moves on a frictionless horizontal table in a circular path of radius 1.0 m. the angular speed is 5.8 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the circle. Someone under ...
Sunday, March 6, 2016 by Max

physics
. 0.30m ....|______|_________________________ ....|...../\ ...|_| <-- box with unknown mass In the figure, the meterstick's mass is 0.200 kg and the string tension is 2.50 N . The system is in equilibrium. Find the (a) unknown mass m and (b) the upward force the fulcrum...
Sunday, March 6, 2016 by lizbeth

physics
A 500g trolly is placed on a runway that is tilted so that it makes an angle of 30 degrees to a horizontal table.A light inextensible string is attached to 150g mass piece.the trolly accelerates down the slope as a result of the force applied by the hanging mass piece.the ...
Sunday, March 6, 2016 by sinethemba

Physics
How can you recognise the beat frequency from a graph? Why is the beat frequency the difference between the two frequencies of the two sound waves (theory behind this)?
Sunday, March 6, 2016 by Hally

physics
An ore car of mass 40000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 16 m lower vertically, is a horizontally situated spring with constant 2.7 × 105 N/m. The acceleration of gravity is 9.8 m/s2 . Ignore friction. How much is ...
Sunday, March 6, 2016 by Jeje

physics
A player kicks a football at an angle of 45 degree with initial speed of 20 metre per second a second player on the goal line 60 metre away in the direction of a kick start training to receive the ball at that instant find the constant speed of the second player with which he ...
Sunday, March 6, 2016 by eddy

physics
a student connects the ends of a pencil lead to a 6.0V supply and measures the current to be 8.6A.the lead is rod of graphite of length 7.5 cm and diameter 1.4mm. a)calculate the resistance of the pencil b)use this data to calculate the resistivity of graphite
Sunday, March 6, 2016 by ruth

physics
a galvanometer has a resistance 60 ohm and is of 5mA full scale deflection.how would you modify it so as to get 0-10V voltmeter
Sunday, March 6, 2016 by ruth

Physics 12
. A rope 2 metres long rests on a table where the coefficient of friction is 0.5. What minimum length of rope can stay on the table before the whole rope will slip off? a) 133 cm b) 80 cm c) 200 cm d) Cannot determine without more information. The answer is A but i can't ...
Sunday, March 6, 2016 by Harvey

Physics
A brass cube 2cm on each edge is held in the jaw of a wire with a force 1600N. By aw much is the cube compressed. (Y for brass is 9.1×10^10pa)
Sunday, March 6, 2016 by CHARLES

Physics
forty 2.0 kg blocks 20.0 cm thick are used to make a retaining wall in a backyard. Each row of the wall will contain 10 blocks. you may assume that the first block is the reference level. How much gravitational potential energy is stored in the wall when the blocks are set in ...
Sunday, March 6, 2016 by AlphaPrimes

physics
At 20°C, a brass cube has an edge length of 34 cm. What is the increase in the cube's surface area when it is heated from 20°C to 67°C?
Sunday, March 6, 2016 by Jim

physics
The vertical and horizontal component of the initial velocity of a projectile are 36m/s and 64m/s. Find the initial velocity and angle inclination
Sunday, March 6, 2016 by charles

physics
Light is an electromagnetic wave and travels at a speed of 3.00 × 10^8 m/s. The human eye is most sensitive to yellow-green light, which has a wavelength of 5.72 × 10^-7 m. What is the frequency of this light?
Sunday, March 6, 2016 by leanne

Physics
A jet plane is flying at a constant altitude. At time t1=0 it has components of velocity Vx=90m/s, Vy=110m/s.At time t2=30.0s the components are Vx=-170m/s, Vy=40m/s.a).Sketch velocity vectors at t1 and t2.How do these two vectors differ?. For this time interval calculate b). ...
Sunday, March 6, 2016 by Jack

Physics
A 910kg object is released from rest at an altitude of 1200 km above the north pole of the earth. If we ignore atmospheric friction, with what speed does the object strike the surface of the earth? (the polar radius of the earth is 6357 km)
Sunday, March 6, 2016 by Anonymous

Physics
An Alaskan rescue plane traveling 38 m/s drops a package of emergency rations from a height of 105 m to a stranded party of explorers. The acceleration of gravity is 9.8 m/s2. Where does the package strike the ground relative to the point directly below where it was released? ...
Saturday, March 5, 2016 by Blake

physics
What is the final equilibrium temperature when 40.0 grams of ice at 0°C is mixed with 5.00 grams of steam at 120°C? The specific heat of ice is 2.10 kJ/kg °C, the heat of fusion for ice at 0°C is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg °C, the ...
Saturday, March 5, 2016 by athirah

physics
At 20°C, a brass cube has an edge length of 34 cm. What is the increase in the cube's surface area when it is heated from 20°C to 67°C?
Saturday, March 5, 2016 by Jim

Physics
Does the total kinetic energy of an isolated system necessarily have to be conserved when its total momentum is conserved?
Saturday, March 5, 2016 by Terry

Climate Physics
Find the insolation in Wm^-2 at summer solstice for a low obliquity of 22 degrees? I used the following: h_0=cos^-1(-tan(phi)* tan(delta)) cos(theta)=[sin(phi)*sin(delta)+cos(phi)​*cos(delta)*cos(h_0)] Result was 397 Wm^-2 This looked like an easy problem, but I am ...
Saturday, March 5, 2016 by Alice

physics
Force charges +q,-q,+q,-q placed at 4 corners of a square of sides 'a' calculate the resultant force on +Q charge at the intersection of 2 diagonals
Saturday, March 5, 2016 by chandan

Physics
If the sky diver releases her chute and an upward force of 800 Newtons is developed due to wind resistance, what will be the net force acting on her?
Saturday, March 5, 2016 by Jamie

physics
calculate the de-broglie wvelenth of the electron orbitting in the n=2 of hydrogen atom
Saturday, March 5, 2016 by sajid

Physics
An elastic cord can be stretched to its elastic limit by a load of 2N. If a 35cm length of the cord is extende 0.6cm by a force of the cord when the stretching force is 2.5N
Saturday, March 5, 2016 by Cryptic

Physics
A soccer ball of mass 550g is at rest on the ground. The soccer ball is kicked with a force of 108N. The player shoes is in contact with the ball for 0.3m. What is KE of the ball? What is the ball's velocity at the moment it loses contact with the soccer player's shoes?
Saturday, March 5, 2016 by Sam

Physics
A 55.3 kg skier is moving at 14.9 m/s on a frictionless horizontal, snow covered plateau when she encounters a rough patch 1.7 m long. The coefficient of kinetic friction between this patch and her skis is 0.27. After crossing the rough patch, what is the speed of the skier in...
Saturday, March 5, 2016 by Desperate Student

physics
A bicycle has 67.0 cm diameter wheels turning at 11.2 rev/s. How fast is the bicycle moving?
Friday, March 4, 2016 by lizbeth

Physics 2
Two boxes are connected by a light string that passes over a light, frictionless pulley. One box rests on a frictionless ramp that rises at 30° above the horizontal (see the Figure below), and the system is released from rest. (a) Which way will the 50kg box move, up the ...
Friday, March 4, 2016 by David

Physics
Two boxes are connected by a light string that passes over a light, frictionless pulley. One box rests on a frictionless ramp that rises at 30° above the horizontal (see the Figure below), and the system is released from rest. (a) Which way will the 50kg box move, up the ...
Friday, March 4, 2016 by David

physics
A car in an amusement park travels without friction on a vertical loop of 20 m radius. Calculate from what minimum height h it needs to be released from rest in order to remain on the track at the top of the loop.
Friday, March 4, 2016 by JuliePham

physics
Two carts of masses m and 3m are at rest on a horizontal frictionless track. A person pushes each cart with the same force F for 5 s. If the kinetic energy of the lighter cart after the push is K = 180J, the kinetic energy of the heavier cart is :
Friday, March 4, 2016 by JuliePham

Physics
A crate is sliding down a ramp that is inclined at an angle 26.8 ° above the horizontal. The coefficient of kinetic friction between the crate and the ramp is 0.260. Find the acceleration of the moving crate.
Friday, March 4, 2016 by Anonymous

Physics
The near point of a patient's eye is 58.2 cm. (a) What should be the refractive power ℛ of a corrective lens prescribed to enable the patient to clearly see an object at 22.0 cm? ℛ = dpt (b) When using the new corrective glasses, the patient can see an object ...
Friday, March 4, 2016 by Rahul

Physics
A person can see an object in focus only if the object is no farther than 35 cm from the right eye and 58 cm from the left eye. Write a prescription for the refractive powers ℛ (in diopters) for the person's corrective lenses. right eye dpt left eye dpt
Friday, March 4, 2016 by Rahul

Physics
A slab of ice with parallel surfaces floats on water. What is the angle of refraction of a light ray in water if the light ray is incident on the upper ice surface with an angle of 60° to the normal?
Friday, March 4, 2016 by Andrea

Physics
A concave spherical mirror has a radius of curvature of 18 cm. Locate the images for object distances as given below. In each case, state whether the image is real or virtual and upright or inverted, and find the magnification. (If an answer does not exist, enter DNE. If an ...
Friday, March 4, 2016 by Physics Lover

Physics
A solid disk rotates in the horizontal plane at an angular velocity of 0.0684 rad/s with respect to an axis perpendicular to the disk at its center. The moment of inertia of the disk is 0.190 kg·m2. From above, sand is dropped straight down onto this rotating disk, so ...
Thursday, March 3, 2016 by Anna

physics
A long straight horizontal wire carries a current I = 4.80 A to the left. A positive 1.00 C charge moves to the right at a distance 5.00 m above the wire at constant speed v = 4500 m/s . What is the magnitude B of the magnetic field at the location of the charge due to the ...
Thursday, March 3, 2016 by k

physics
One of the conditions for Uniform Circular Motion is that the acceleration be centripetal and directed toward the center of motion. What would the effect be of a non-zero acceleration parallel to the tangential velocity?
Thursday, March 3, 2016 by lizbeth

physics
The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. (a) If a car traveling 21.0 m/s stops uniformly in 1.20 m, how long does the collision last? s (b) What is the magnitude of the average force on the ...
Thursday, March 3, 2016 by mark

physics
A 3.30-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.204 s, what is the average force ...
Thursday, March 3, 2016 by sara

physics
A 0.224-kg volleyball approaches a player horizontally with a speed of 18.0 m/s. The player strikes the ball with her fist and causes the ball to move in the opposite direction with a speed of 22.0 m/s. (a) What impulse is delivered to the ball by the player? kg·m/s (b...
Thursday, March 3, 2016 by sara

Physics
A girl standing on a bridge throws a stone vertically downward with an initial velocity of 15.0 m/s into the river below. If the stone hit's the water 2.00 seconds later what is the height of the bridge above the water?
Thursday, March 3, 2016 by Tyler

Physics M/C Quesion
Two cyclists are travelling at constant speeds around a 400 m track in opposite direction. The speed of Jeff is 1.5 times the speed of Rob. The cyclists find they meet every 20 s. What is the speed of Jeff? A) 9.0 m/s B) 12 m/s C) 13 m/s D) 20 m/s E) 30 m/s
Thursday, March 3, 2016 by the physics kid

Physics M/C Quesion
A car travelling on a straight track accelerates uniformly from rest for 5.0 s and then travels at a constant speed for the next 5.0 s, covering a total distance of 75 m in that time. Determine the constant speed that the car achieved. A) 7.5 m/s B) 10 m/s C) 15 m/s D) 20 m/s ...
Thursday, March 3, 2016 by The lost one

Physics
An Alaskan rescue plane traveling 43 m/s drops a package of emergency rations from a height of 129 m to a stranded party of explorers. The acceleration of gravity is 9.8 m/s 2 . Where does the package strike the ground relative to the point directly below where it was released...
Thursday, March 3, 2016 by Meghan

Physics
Gold-198 with a half life of 2.6 days is used to diagnose and treat liver disease. Write a half life decay equation that relates the mass of au-198 remaining to time in days. What percentage of a sample of Au-198 would reamin after 1 day, 1 week? Given the information, I could...
Thursday, March 3, 2016 by AlphaPrimes

Physics
a box of mass 7 kg is pulled up a frictionless 30 degree incline by a force of 381 N which acts parallel to the incline surface. the box has an initial speed of 5m/s and is pulled 9m. what is the speed of the box at the end of the 9m.
Thursday, March 3, 2016 by Anon

Physics
Two soccer players, Mary and Jane, begin running from nearly the same point at the same time. Mary runs in an easterly direction at 4.43 m/s, while Jane takes off in a direction 60.2o north of east at 5.07 m/s. How long is it before they are 24.7 m apart? What is the velocity ...
Thursday, March 3, 2016 by Ron

Physics
a box of mass 7 kg is pulled up a frictionless 30 degree incline by a force of 381 N which acts parallel to the incline surface. the box has an initial speed of 5m/s and is pulled 9m. what is the speed of the box at the end of the 9m.
Thursday, March 3, 2016 by S

Physics
a mass, m = 2.1 kg, is ejected horizontally from a compressed coil with a force constant, k = 5.2 N/m and compression, x = 25 cm, onto a rough ramp that is 1.5 cm long with one end raised to a height, h= 120 cm. the speed at the bottom of the rough ramp is v=+3.037 m/s. the ...
Thursday, March 3, 2016 by S

Physics
a 2199 kg pile driver is used to drive a steel beam into the ground. the pile driver falls 8.8 m before contacting the beam, and it drives the beam 19 cm into the ground before coming to rest. using energy considerations, calculate the average force the beam exerts on the pile...
Thursday, March 3, 2016 by Anonymous

Physics
Imagine a landing craft approaching the surface of Callisto, one of Jupiter's moons. If the engine provides an upward force (thrust) of 2784 N, the craft descends at constant speed; if the engine provides only 1879 N, the craft accelerates downward at 0.39 m/s2. What is ...
Thursday, March 3, 2016 by Kameron

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Homework Help: Science