Saturday
April 30, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
a box of mass 10kg is at rest on a horizontal plane.a force of 20N is applied to it at 30 degrees to the plane.assuming there no frictional force between the box and the plane,calculate the acceleration of the box.
Friday, March 11, 2016 by Misheck

Physics
At a busy intersection a 1460-kg car traveling west with a speed of 12 m/s collides head-on with a minivan traveling east with a speed of 9.4 m/s. The cars stick together and move with an initial velocity of 1.5 m/s to the east after the collision. What is the mass of the ...
Friday, March 11, 2016 by Alana

Physics
A missile is fired with a launch velocity of 15000 ft/s at a target 1200 miles away. At what angle must it be fired to hit the target? Use g = 32 ft/s.s
Friday, March 11, 2016 by Ben

Physics
A motorcycle stunt rider rides off the edge of a cliff. Just at the edge his velocity is horizontal, with magnitude of 9 m/s. Find the motorcycle's position from the edge of the cliff afyer 0.5 s. Use g = 9.8 m/s.s
Friday, March 11, 2016 by Bentong

Physics
A bomb is dropped from an airplane travelling horizontally with a speed of 300mph. If the airplane is 10000 ft above the ground, how far from the target must it be released? Use g = 32 ft/s.s Express your answer in miles.
Friday, March 11, 2016 by Bentong

physics
At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.20%? At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 2.0%? At what height above Earth's surface ...
Friday, March 11, 2016 by please help

Physics
A pool ball of mass 100g and velocity [5,-4]m/s collides with a stationary pool ball of the same mass. After the collision, the pool balls have velocites [2,-3]m/s and [3,-1]m/s. Is the collision elastic? Explain your answer.
Friday, March 11, 2016 by Sam

Physics
A pendulum bob has a mass of 1kg. The length of the pendulum is 2m. The bob is pulled to one side to an angle of 10degree from the vertical. What is the velocity of the pendulum bob as it swings through it's lowest point? What is angular velocity?
Thursday, March 10, 2016 by Sam

Physics
A ball of mass 500g is kicked into the air at angle of 45degree. It reaches a height of 12m. What was it's initial velocity?
Thursday, March 10, 2016 by Sam

Physics (Kinematics)
In the same instant that a Porsche races past him at 130 km/h, a speed cop gets off his motorcycle, accelerates uniformly at 8 m/s^2, to catch the speedster. After 5 seconds the trafic officer reaches his top speed, which he then maintains until he reaches up to the car. How ...
Thursday, March 10, 2016 by Jonathan Nokhoya

Physics
An airplane pilot checks her instruments and finds that the air speed of the plane is 325 km/h. the instruments show that the plane is pointed in a direction (S 30 W). A radio report indicates that the wind velocity is 80 km/h (W). What is the velocity of the plane relative to...
Thursday, March 10, 2016 by lomonoyan

physics
A binary star consists of two dense sphereaty masses of 10rest power 30 kg and 2 x 10rest power 30kg. Whose centres are 10rest power7km apart and which rotate togethe with angula velocity w about an axis which intersects a line joining their centres - show that if the only ...
Thursday, March 10, 2016 by ugochukwu

Physics
A 30-gram bullet leaves a gun barrel with a speed of 230 m/s. (a) What work is done on the bullet while it is in the gun barrel? (b) If the gun is 0.60m long, what is the average force on the bullet?
Thursday, March 10, 2016 by DeezNutz

Physics (Inside the atom)
A sample of radioactive isotope I is to be used for medical diagnosis of the kidneys. The isotope has a half-life of 8.0 days, and the sample is required to have an activity of 8 x 10^5 per second at the time it is given to the patient. Calculate the mass of the I-131 present ...
Thursday, March 10, 2016 by Hannah

Physics
a speeding car is driving at 120 km/h when it passes a police cruiser that is driving at 100 km/h. One second later, the police cruiser accelerates uniformly at 15 km/h until it reaches a speed of 135 km/h. how long does it take the police cruiser to catch the car
Thursday, March 10, 2016 by John

physics
An object is placed (a) 6cm (b) 20cm from a thin convex lens of focal length 10cm. Determine the nature, position and magnification of the image in each case.
Thursday, March 10, 2016 by ugochukwu

Physics
a tennis ball has mass 0.045 kg and is hit at a speed of 120 km/h by the server. the opposing player hits the ball exactly back along the line of its trajectory giving the ball a new speed of 115 km/h. if the contact time between the racquet and the ball is 0.02s what is the ...
Thursday, March 10, 2016 by Anonymous

Physics
during a snowball fight two balls with masses of 0.28 and 0.75 kg, respectively , are thrown in such a manner that they meet head-on and combine to form a single mass. the magnitude of initial velocity for each is 15 m/s. what is the speed of the combined mass immediately ...
Thursday, March 10, 2016 by Anonymous

Physics
a 6 kg mass with an initial velocity of 7 i m/s collides and sticks to a 5 kg mass with an initial velocity of v j m/s. the direction of the final velocity of the two masses with respect to the direction of the x axis is -15 degrees. what is v?
Thursday, March 10, 2016 by Anonymous

physics
a)find the charge to mass ratio for an electron accelerated through 600v in a magnetic field of strength 45mT where the speed of the electrons is 1.4*10^7m/s b)what is the percentage difference b/n your result and the accepted ratio with the value q=1.6*10^-19C and m=9.11*10^-...
Thursday, March 10, 2016 by ruth

Physics
A police car approaches a large wall at 51m/s. Its siren emits a 980 Hz signal. What is the frequency of the reflected sound observed by the officer?
Thursday, March 10, 2016 by maryam

physics
an electron moves in the plane of paper toward the top of the page .a magnetic field is also in the plane of the page and directed toward the right .what is the direction of the magnetic force on the electron ?
Thursday, March 10, 2016 by ruth

physics
At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.20%? At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 2.0%? At what height above Earth's surface ...
Thursday, March 10, 2016 by lizbeth

Physics
Suppose a 300–g kookaburra (a large kingfisher bird) picks up a 84.0–g snake and raises it 2.30 m from the ground to a branch. How much work did the bird do on the snake? I know that W=deltaPE, and PE=mgh. I keep getting 1046.64. Please help!
Thursday, March 10, 2016 by Emily

Physics
a 45-kg box initially at rest is being pushed with a force of 950 N along a frictionless horizontal surface. What is the speed of the boz after traveling a distance of 2.0m
Thursday, March 10, 2016 by Thea

Physics
An image formed by a convex mirror (f = -24.0 cm) has a magnification of 0.150. Which way and by how much should the object be moved to double the size of the image?
Thursday, March 10, 2016 by zhel

Physics
Devise the series or parallel combination of 2 capacitances from the E6 series that gives the closest match to the capacitance 1.14 μF. Indicate the percentage error between the desired value and the value you obtain.
Thursday, March 10, 2016 by Mike

Physics
Someone please help. A radio needs to be tuned to a range of values between 526.5 - 1606.5 kHz. Choose a combination of inductor and variable capacitor values within a tuned circuit that would meet this requirement. Choose practical components from standard vendor web sites (e...
Thursday, March 10, 2016 by Dan

Physics
Nicole is late for work. She jumps in her car and drives to work in 3.5 minutes. Her work place is 3.85 km away from her house. The speed limit between home and work is 50 km/hour. Is Nicole speeding?
Thursday, March 10, 2016 by Tom

Physics
Juliet sits on her balcony while Romeo serenades her from the ground, 7.00m below. To win Juliet’s affection, Romeo throws Juliet a bouquet of roses. At what velocity must the roses be thrown if they are to reach Juliet on the balcony?.
Thursday, March 10, 2016 by Tom

Physics
Gary and Elaine are competing as a team in an orienteering event. They follow instructions telling them to go 50 m [N], 75 m [NE] and 100 m [30o E of S]. a) Calculate the total distance travelled b) Draw a vector diagram to determine the resultant displacement.
Thursday, March 10, 2016 by Tom

physics
An object of mass 10kg is drawn from height of 10cm. Find (g=10m/s) its kinetic energy on reading the ground.. Velocity before as it reaches the ground.
Thursday, March 10, 2016 by pratheeksha

PHYSICS
A CAR COVERED A DISTANCE OF 10m IN 5 s; ITS SPEED WILL BE?
Thursday, March 10, 2016 by RUNALDO

physics
the speed of light is measured to be 1.50*10^8 m/s in a sucrose water solution. calculate the refractive index of the solution. \
Thursday, March 10, 2016 by ayesha

math111
in a science class,65 student study physics while 40 study chemistry.if there are 93 student in the class,how many student study both physics and chemistry?
Thursday, March 10, 2016 by james

Physics
Consider a sound wave in air that has displacement amplitude 0.1mm.calculate the pressure amplitude for frequensis of: 1) 500 Hz 2) 20,000 Hz
Thursday, March 10, 2016 by Megha

Physics
Verify that the formula u(t)=Acos(ωo*t+Φ) is a solution to the differential equation for the mass on a spring, by plugging this expression for u(t) directly into the differential equation: d^2u/dt^2+ωo^2*u=0.
Thursday, March 10, 2016 by Anonymous

Physics
The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900 J/kg • K. If 300 kJ of heat are added to 442 g of aluminum at 100°C, what is the final state of the system? That is, how much is liquid, how ...
Thursday, March 10, 2016 by MB

physics
A train is moving with a speed of 50 miles per hour. A man standing in the rear of a train car throws a ball toward the front of the train with a speed of 10 miles per hour. If a stationary observer outside the train sees this happen, what speed is the ball moving with? ...
Wednesday, March 9, 2016 by cadey

Physics
5. A grating with 400 lines per mm is illuminated with light of wavelength 600.0 nm. (a) Determine the angle at which the maxima are observed (b) Determine the largest order (n) that can be seen with this grating and this wavelength.
Wednesday, March 9, 2016 by Luke

physics
A charge q1 = 5 nC is located at the origin of xy copedinate system, and a charge of q2 = -2 nC is located on the y-axis at y =.30m. Find the components of the electric field and its magnitude and direction at a point P with coordinates (.40m, .30m).
Wednesday, March 9, 2016 by micah

physics
Three sheets of plastic have unknown indices of refraction. Sheet 1 is placed on top of sheet 2, and a laser beam is directed onto the sheets from above. The laser beam enters sheet 1 and then strikes the interface between sheet 1 and sheet 2 at an angle of 19.8° with the ...
Wednesday, March 9, 2016 by James

physics
Three sheets of plastic have unknown indices of refraction. Sheet 1 is placed on top of sheet 2, and a laser beam is directed onto the sheets from above. The laser beam enters sheet 1 and then strikes the interface between sheet 1 and sheet 2 at an angle of 19.8° with the ...
Wednesday, March 9, 2016 by Anonymous

physics
When you look through a 3.7 mm thick window comprised of a material whose refractive index is 1.59, by what time interval is the light you see delayed by having to go through glass instead of air? By how many wavelengths is it delayed, if its vacuum wavelength is 600 nm?
Wednesday, March 9, 2016 by Anonymous

physics
When you look through a 3.7 mm thick window comprised of a material whose refractive index is 1.59, by what time interval is the light you see delayed by having to go through glass instead of air? By how many wavelengths is it delayed, if its vacuum wavelength is 600 nm?
Wednesday, March 9, 2016 by Anonymous

physics
When you look through a 3.7 mm thick window comprised of a material whose refractive index is 1.59, by what time interval is the light you see delayed by having to go through glass instead of air?
Wednesday, March 9, 2016 by Anonymous

Physics
The momentum of a 12 kg dog racing to greet its owner is 37 kg m/s. What is the dog’s speed? is Pb-mbvb=(12)(37)=?
Wednesday, March 9, 2016 by Reina Bonilla

physics
When you look through a 3.7 mm thick window comprised of a material whose refractive index is 1.59, by what time interval is the light you see delayed by having to go through glass instead of air?
Wednesday, March 9, 2016 by Anonymous

Probability
The probability that a student passes a physics test is 2/3 and the probability that he passed both physics test and an english test is 14/15. The probability. The probability that he passes at least one test is 4/5. What is the probability that he passes the english test.
Wednesday, March 9, 2016 by Ammu

Physics
Many people mistakenly believe that the astronauts that orbit the Earth are "above gravity". Calculate g for space-shuttle territory, 206 kilometers above the Earth's surface. Earth's mass is 6e24 kg, and its radius is 6.38e6 m (6380 km). Your answer is what ...
Wednesday, March 9, 2016 by Kevin

Physics
Find the change in the force of gravity between two planets when the distance between them is decreased by a factor of 4.7
Wednesday, March 9, 2016 by Kevin

physics
A 50 kg sign is hanging from the ceiling .calculate the tension in the ropes?30 degree and 20 degree
Wednesday, March 9, 2016 by mulaudzivhonani

physics
a ball of 100g is thrown vertically upwards with an initial speed of 150km/h, calculate the time taken to return to the thrower
Wednesday, March 9, 2016 by wisdom

physics
At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.20%? At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 2.0%? At what height above Earth's surface ...
Wednesday, March 9, 2016 by lizbeth

Physics
A ball is dropped from a building, after 2 sec another ball is thrown downward. After 6 sec the second ball overtook the first ball. Is the second ball has greater acceleration than the first ball? Explain.
Wednesday, March 9, 2016 by Leaha Angelina

physics
Three charges, +2.5 micro coulomb, -4.8 micro coulomb and 6.3 micro coulomb, are located at (0.20m, .15m), (.50m, -.35m), and (-.42m,-.32m) respectively. What is the electric field at the origin?
Wednesday, March 9, 2016 by micah

PHYSICS ( PERIODIC MOTION)
A grandfather clock uses a physical pendulum to keep time. The pendulum consists of a uniform thin rod of mass M = 2.01 kg and length L = 0.19 m that is pivoted freely about one end, with a solid disk of mass 3M and a radius of L/4 attached to the free end of the rod. a) What ...
Wednesday, March 9, 2016 by MUSTAFA GHANIM

PHYSICS ( PERIODIC MOTION)
In a lab, a student measures the unstretched length of a spring as 12.9 cm. When a 113.6-g mass is hung from the spring, its length is 26.3 cm. The mass-spring system is set into oscillatory motion, and the student observes that the amplitude of the oscillation decreases by ...
Wednesday, March 9, 2016 by MUSTAFA GHANIM

Physics
Is Gc (32.2 lbmft/lbfs^2) equal to gravity? I think it is, but I'm kinda confused about the whole concept. Could someone explain it to me? Thank you very much.
Wednesday, March 9, 2016 by Danny

physics
Assumed that north is the y-direction and east the x-direction. You are piloting the boat that moves at a constant speed of 10 km/hr relative to the water beneath it. 1) On a body of still water, you point your boat due north for 2hr, then turn due east and continue for ...
Tuesday, March 8, 2016 by anna

Physics
A Ferris wheel, 24.0 m in diameter, rotates once every 12.5 s(see the diagram.) What is the fractional change in a person'sapparent weight (a) at the top, and (b) at the bottom, as comparedto her weight at rest?
Tuesday, March 8, 2016 by Jade

Physics
The ability to hear a “pin drop” is the sign of sensitive hearing. Suppose a 0.55-g pin is dropped from a height of 28 cm, and that the pin emits sound for 1.5s when it lands. Assuming all of the mechanical energy of the pin is converted to sound energy, and that ...
Tuesday, March 8, 2016 by Cameron Arnold

Physics
samuel drives his bicycle east at a velocity of 10.0 m/s. he then increases his speed in the same direction to 25.0 m/s in 3.50 s. what is his average speed
Tuesday, March 8, 2016 by Tristan

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 vanessa

Physics 1
A 50 kg cannonball hits a war tank vehicle of 12,000 kg that is initially at rest. The cannonball embeds in the tank and both move at the same velocity for 50 cm until they both come to a rest. What is the initial velocity of the cannonball if the coefficient of friction ...
Tuesday, March 8, 2016 by David

Physics 1
A golf ball of mass 125 g hits a billiards ball of mass 172.5 g that is initially at rest. After the collision, the golf ball moves to the right at a speed of 10 cm/s. The billiards ball moves to the left with a speed of 58 cm/s. (a) What was the velocity of the golf ball ...
Tuesday, March 8, 2016 by David

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

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Homework Help: Science