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March 29, 2017

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Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
A transverse wave is formed on a long skipping rope. The equation of the transverse wave is y=5.50 sin(0.031π x+5.52π t) where x and y are in centimeters, t is in seconds, and Π is pi (3.14..). Find the amplitude of the wave? what is the wavelength of the transverse wave? ...
Sunday, March 19, 2017 by Nicole

physics
How do you draw a force diagram for an object that is tied to a pole and is moving in a constant circular direction?
Sunday, March 19, 2017 by homework

Physics
What is the direction of the displacement of a person who walks 10 km at 37 degrees south of east, then 14 km due west?
Sunday, March 19, 2017 by Anonymous

Physics
At what acceleration would you expect the blood pressure in the brain to drop to zero for an erect person? Why? (Assume there are no body mechanisms operating to compensate for such conditions)
Sunday, March 19, 2017 by Gihan

modern physics
A radioisotope P has a half-life of 3 s. At t = 0, a given sample of this isotope contains 8000 atoms. Calculate (i) its decay constant, (ii) average life, (iii) the time t1 when 1000 atoms of the isotope P remain in the sample, and (iv) number of decays per second in the ...
Sunday, March 19, 2017 by gourav

modern physics
Calculate the deBroglie wavelength of a^ 87Rb atom that has been laser cooled to 120 µK. (Assume that the kinetic energy is .3/2kBT)
Sunday, March 19, 2017 by gourav

modern physics
A star emits light with wavelength 120 nm. An observer on earth measures the wavelength of the light received from the star to be 600 nm. Calculate the speed with which the star is moving.
Sunday, March 19, 2017 by gourav

modern physics
Missiles are fired towards the earth from a spacecraft. The missiles are moving with a speed of 0.8c with respect to the spacecraft. If the spacecraft itself has a speed of 0.3c with respect to Earth, how fast are the missiles observed to travel with respect to Earth? What ...
Sunday, March 19, 2017 by gourav

modern physics
The rest energy of a proton is 938 MeV. If its kinetic energy is also 938MeV, calculate its momentum and speed.
Sunday, March 19, 2017 by gourav

modern physics
Supersonic jets are able to achieve maximum speeds of up to 3.0 × 10-6c. Calculate the percentage contraction in the length of a jet plane travelling at this speed.
Sunday, March 19, 2017 by gourav

modern physics
The earth and the sun are 8.3 light-minutes apart in the same inertial frame. Two events occur at t = 0 on the earth and t = 3 minutes on the sun respectively. Calculate the time difference between the events according to an observer moving at u = 0.6c from the earth to the ...
Sunday, March 19, 2017 by gourav

physics
Two Small sphere are given positive electrical change. When they are 40cm apart the repulsion force between them has magnitude 0.25N what the charge on each sphere if two changes are equal
Sunday, March 19, 2017 by adam

physics
Two boxes of masses 3kg and 8kg respectively are moving with velocities 5m/s and 3m/s in opposite direction. If they stick together after impact, calculate their common velocity.
Sunday, March 19, 2017 by rutty

Physics
The lenses used in a compound microscope have powers of + 110 D and + 60 D . If a total magnification of -150 × is desired, what should be the distance between the two lenses?
Sunday, March 19, 2017 by Kim

Physics
A spaceship travels through space at a constant velocity of 3.00 x 10^2 m/s. What is the net force acting on the spaceship?
Saturday, March 18, 2017 by Student12

advance physics
A carnot’s engine with air as working substance is initially at 3270C and pressure of 12 atmospheres. The volume is one litre to start with. The expansion or compression ratio is 1:6. Find the lowest temperature and efficiency. (γ= 1.4)
Saturday, March 18, 2017 by anil

physics 1
) An oil tanker’s engines have broken down, and the wind is blowing the tanker straight toward a reef at a constant speed of 1.5 m/s (Fig.1). When the tanker is 500 m from the reef, the wind dies down just as the engineer gets the engines going again. The rudder is stuck, so...
Saturday, March 18, 2017 by omar

Physics
4. Two vehicles of equal mass collide at a 90° degree intersection. If the momentum of vehicle A is 1.20x10^5 kg km/h east and the momentum of vehicle B is 8.50x10^4 kg km/h north, what is the resulting momentum of the final mass?
Saturday, March 18, 2017 by Sotha Bun

Physics
3. Two vehicles collide at a 90 degree intersection. If the momentum of vehicle A is 6.10 x10^5 kg km/h south and the momentum of vehicle B is 7.20 x 10^5 kg km/h east, what is the magnitude of the resulting momentum of the final mass?
Saturday, March 18, 2017 by Sotha Bun

Physics
2. Two pickup trucks crash at a 90 degree intersection. If the momentum of pickup A is 4.60 x10^4 kg km/h north and the momentum of pickup B is 6.25 x 10^4 kg km/h east, what is the magnitude of the resulting momentum of the final mass?
Saturday, March 18, 2017 by Sotha Bun

Physics
1.Two motorcycles of equal mass collide at a 90 degree intersection. If the momentum of motorcycle A is 450 kg km/h west and the momentum of motorcycle B is 725 kg km/h south, what is the magnitude of the resulting momentum of the final mass?
Saturday, March 18, 2017 by Sotha Bun

physics
Two Children,A and B, fire identical 10g ball bearing from a catapult. The elastic band of each catapult is elastically extended by 0.10m and then released to fire a the ball bearings. Child A's elastic band has a spring constant of 144 N/m. Calculate the energy transferred to...
Saturday, March 18, 2017 by Sam

physics-lenses
What eyeglasses would you prescribe for persons with the following conditions: a) A near point of 49.8cm ? b) A far point of 49.8cm ?
Friday, March 17, 2017 by eliz

physics-lenses
A converging lens f1=10cm, is placed 25cm to the left of a diverging lens, f2=−15cm. An object is placed 22cm to the left of the converging lens. Locate the final image... in cm and its magnification. I'm not sure how to approach this problem, or the types of formulas I ...
Friday, March 17, 2017 by eliz

physics-lenses
A converging lens of focal length 4.3 m produces a magnified image 6.7 times the size of the object. What is the object distance if the image is real? virtual? pleasse help!
Friday, March 17, 2017 by eliz

physics
A <69.0> kg construction worker is standing on an 18.0 kg plank. The plank is <12.50> m long and it is suspended by vertical cables at each end. If the worker stands 2.80 from the right end of the plank, what is the tension in right cable? Give your answer in ...
Friday, March 17, 2017 by Idali

PHYSICS
a stone of mass 0.5kg is drop from a height of 12m. calculate; it's kinetic energy. (g=10m/s2).
Friday, March 17, 2017 by GLORY

Physics
A wire runs left to right and carries a current in the direction shown. What is the direction of the magnetic field at point Z?
Friday, March 17, 2017 by Anonymous

Physics
A positive charge moving up enters a magnetic field pointing out of the screen. What is the direction of the magnetic force on the charge? up down right left
Friday, March 17, 2017 by Anonymous

Physics
What must be known to determine the direction of the magnetic force on a charge? the type of the charge the amount of the charge the direction of the magnetic field the velocity of the charge the strength of the magnetic field
Friday, March 17, 2017 by Anonymous

Physics
The magnetic field 0.02 m from a wire is 0.1 T. What is the magnitude of the magnetic field 0.01 m from the same wire?
Friday, March 17, 2017 by Anonymous

Physics
If a Wire Resistance is 10 ohm at 0 DegC and the same wire Resistance becomes 15 ohm at temperature 100 DegC, then at what temperature the wire Resistance will be 30 ohm? Temperature coefficient of the wire material is 0.0047.
Friday, March 17, 2017 by SIDDHARTHA

Physics
Two point charges of 16 microcoulomb and - 9 microcoulomb are placed at8 cm distance. determine the position of the point at which resultant electric field is zero
Friday, March 17, 2017 by Harsh

Physics
When a 2Kg block of metal at 600°C is put into water at its boiling point, 0.5 kg of steam is released. Find the specific heat capacity of the metal?
Thursday, March 16, 2017 by Rita

Physics
Physics lab need help with sources of error. In our lab, we had to use carbon tape and a spark timer to find out the maximum velocity and maximum acceleration of a high school student. I'm having a hard time to find sources of errors. Any ideas or insights would be really ...
Thursday, March 16, 2017 by Chris

physics
A block is sent up a frictionless ramp along which an x-axis extends upward. The figure below gives the kinetic energy of the block as a function of position x. If the block’s initial speed is 4.00 m/s, what is the normal force on the block? (initial KE is 40J) initially i ...
Thursday, March 16, 2017 by julia

Physics
A plane directly east at a velocity of 860 km/h for 45 min and then travels directly west with a velocity of 720 km/h for 1h and 30 min. Find the following values for this plane, expressed in km and km/h: a) Total displacement b) Total distance c) Average velocity d) Average ...
Thursday, March 16, 2017 by Student12

physics
A pulley system of 4 pulleys is used to raise a loan of mass 50kg vertically,if its effeciency is 80%,determine the minimum effort required to raise the load(g=10ms-2)?
Thursday, March 16, 2017 by Abba

physics
A soccer ball has a diameter of about 22 cm and a mass of about 430 g. What is its terminal velocity?
Thursday, March 16, 2017 by jared

Physics
Given that charge of the electron is 1.6 x10^-19 C,What is the energy gained by the cathode ray particle when a voltage of 800 volts is applied between the electrodes of a cathode ray tube
Thursday, March 16, 2017 by Anonymous

physics
A stone of mass 2.8kg is projected upward with a speed of 5m/s. calculate the maximum height reached. use g=10m/s square.
Thursday, March 16, 2017 by Mawatta

physics
a uniform rod is 1m caring a weight of 100N calculate its tension of the string holding it an the reaction at the hinge
Thursday, March 16, 2017 by michael daniel

physics
How much positive and negative charge is there in a cup of water
Thursday, March 16, 2017 by sharma

physics
Find the relativistic momentum of an electron and proton accelerated through a potential of 10*10e6 Volts 10.5MeV/c , 137.4MeV/c 10.5MeV/c , 13.74MeV/c 105MeV/c , 13.74MeV/c 105MeV/c , 1.37MeV/c None of the above
Thursday, March 16, 2017 by dipali

AP Physics
A block and a spool have the same mass, and are each pulled across a level, frictionless surface by a string, as shown to the right. The string pulling the spool is wrapped around it many times, and the other string is fastened to the center of the block. Both hands pull with ...
Wednesday, March 15, 2017 by Anonymous

Physics
A block and a spool have the same mass, and are each pulled across a level, frictionless surface by a string, as shown to the right. The string pulling the spool is wrapped around it many times, and the other string is fastened to the center of the block. Both hands pull with ...
Wednesday, March 15, 2017 by Anonymous

Physics
A potter’s wheel with rotational inertia 24 kg m2 is spinning freely with no friction at 50 rpm. A piece of clay is dropped from above the wheel and sticks 0.5 m from the center of the wheel. Afterward, the rotational speed of the wheel and clay has dropped to 48 rpm. The ...
Wednesday, March 15, 2017 by Anonymous

Physics
The game of Jacks is played with pieces like those shown to the right, consisting of four small spheres at the ends of two perpendicular rods of length L and mass M. The piece is spun as shown about an axis through the third perpendicular rod of length L and mass M. Assume ...
Wednesday, March 15, 2017 by Anonymous

Physics
A wheel with rotational inertia I initially rotates with a angular speed ωi . A torque is applied, speeding the wheel up to three times the angular speed in time Δt . A) Find the magnitude of the applied torque. B) Find the work done on the wheel during this time.
Wednesday, March 15, 2017 by Anonymous

Physics
A hamster sits 0.10 m from the center of a lazy Susan of negligible mass. The wheel has an angular velocity of 1.0 rev/s. How will the angular velocity of the lazy Susan change if the hamster walks to 0.30 m from the center of rotation? Assume zero friction and no external ...
Wednesday, March 15, 2017 by Anonymous

11 grade / physics
a body reaches the max height of 80m when projected at the angle of 30degree find the horizontal component
Wednesday, March 15, 2017 by muskan

physics newton
During an episode of turbulence in an airplane you feel 180 N heavier than usual. Part A If your mass is 86 kg, what are the magnitude and direction of the airplane’s acceleration?
Tuesday, March 14, 2017 by silvia

physics help
A 1.2-kg block slides on a horizontal surface with a speed of v=0.80m/s and an acceleration of magnitude a=3.2m/s2, as shown in (Figure 1) . a<__________ box _________>v What is the coefficient of kinetic friction between the block and the surface? Express your answer to...
Tuesday, March 14, 2017 by anonymous

physics
A 9.8-kg monkey hangs from a rope, as shown in (Figure 1) . The tension on the left side of the rope is T1 and the tension on the right side is T2. In the figure, θ=15∘ and ϕ=23∘. Determine the tension T1. Express your answer to two significant figures and include ...
Tuesday, March 14, 2017 by anonymous

physics
a photon whose energy equals the rest energy of the compton collision with an electron, if the electron moves off an angle of 40 degrees to the original photon direction, what is the energy of the scattered photon? assume all constant given. please i need an answer.
Tuesday, March 14, 2017 by brite

physics
During an episode of turbulence in an airplane you feel 180 N heavier than usual. Part A If your mass is 86 kg, what are the magnitude and direction of the airplane’s acceleration? 2sf
Tuesday, March 14, 2017 by ana

Physics ( oscillations and waves)
a stretched string is observed to vibrate with frequency 30Hz in its fundamental mode when the supports are 60cm apart. the amplitude at the antinode is 3cm.the string has a mass of 30kg.calculate the speed
Tuesday, March 14, 2017 by Pavan s m

physics!
A (10.25) kg bowling ball is hung on a (11.50) m long rope. It is then pulled back until the rope makes an angle of (39.0)o with the vertical and released. Find the tension in the rope when the ball is at the lowest point. Give your answer in N and with 3 significant figures.
Tuesday, March 14, 2017 by Idali

Physics ( oscillations and waves)
two collinear harmonic oscillations are X1= 8 sin( 100pi *t) and X2= 12 sin(96 pi *t) are superposed. calculate the values of time when the amplitude of the resultant oscillation will be maximum and minimum
Tuesday, March 14, 2017 by Pavan s m

Physics
A thin-walled sphere rolls along the floor. What is the ratio of its translational kinetic energy to its rotational kinetic energy through its center of mass?
Tuesday, March 14, 2017 by Gigi

Physics
A 5g bullet is fired horizontally and hits an 8kg block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet?
Tuesday, March 14, 2017 by Angel

Physics
A 5 gram bullet is fired horizontally and hits an 8 kilogram block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet?
Tuesday, March 14, 2017 by Angel

physics
a point mass of 12.5 kg is hung from an 18.3 m long rope and swings back and forth with an amplitude of 2.34m. what is the oscillation period for the pendulum system?
Tuesday, March 14, 2017 by Anonymous

physics
How much energy is absorbed when 10g of ice at 0degree Celsius becomes steam at 100 degree Celsius?
Tuesday, March 14, 2017 by ananya

PHYSICS
can someone help me with physics lab homework please: load 300 g at 60 degree mass at 180 deg 150 g mass at 270 deg 260 g for step two resolution of 300-g at 60 degree f load= fx'= fy'= percent error for each component for setup II? WOULD THE HYPOTHETICAL SITUATION DESCRIBED ...
Tuesday, March 14, 2017 by LISA2

physics
can someone help me with physics lab homework please: load 300 g at 60 degree mass at 180 deg 150 g mass at 270 deg 260 g for step two resolution of 300-g at 60 degree f load= fx'= fy'=
Tuesday, March 14, 2017 by LISA

AP physics
i am given strings at different angle connected to a sign that is at equilibrium. i am given the mass of the sign but only one of the angles of the string. how do i find the tension in each string?
Monday, March 13, 2017 by Anthony

physics
The spring is compressed against the floor a distance of 1.6 cm and released. If the spring constant is 60 N/m, what is the magnitude of the spring force acting on the toy at the moment it is released?physics
Monday, March 13, 2017 by dan

physics
In an arcade game, a 0.12 kg disk is shot across a frictionless horizontal surface by being compressed against a spring and then released. If the spring has a spring constant of 230 N/m and is compressed from its equilibrium position by 8.0 cm, what is the magnitude of the ...
Monday, March 13, 2017 by dan

Physics
A thin-walled sphere rolls along the floor. What is the ratio of its translational kinetic energy to its rotational kinetic energy through its center of mass?
Monday, March 13, 2017 by Sara

physics
Explain in a few words why, when operating a garden hose fitted with a trigger-operated nozzle, the water jet is momentarily more powerful at the instant the trigger is squeezed than later, when there is a continuous stream of water. Show that the amount of power in the water ...
Monday, March 13, 2017 by jj

Physics
The figure below represents a section of a circular conductor of nonuniform diameter carrying a current of 4.50 A. The radius of cross-section A1 is 0.300 cm. (a)What is the magnitude of the current density across A1? A: 1.59155e2 using J=I/((r^2)pi) (b) If the current density...
Monday, March 13, 2017 by Tony

Physics
Three charges lie along the x axis the positive charge Q1 = 4mC is at X=2m and the postion of postive Q2 = 8uC is at the origin Q3 is placed on the x axis what is the sign on Q3 and why
Monday, March 13, 2017 by Anonymous

Physics
Three resistance of 8,12, and 24 ohms are in parallel. This combination is in series with another parallel of 10,10, and 20 ohms. The whole combination is then connected to a battery of 16.6 volts. If the current through the 20 ohm resistor is 0.4 amperes. Find: a.) The ...
Monday, March 13, 2017 by Mycah

Physics
One guideline for how diffraction affects shadows is that distinct shadows are created if the width of something is a minimum of 10 times greater than the wave’s wavelength. What would be the narrowest width of something to make a distinct shadow with blue light of frequency...
Sunday, March 12, 2017 by Anonymous

Elastic Collisions-Physics
A 0.16 kg billiard ball moving at 1.20 m/s collides elastically with one of the same mass at rest. It continues at a speed of 0.6 m/s afterward in a different direction from before. What is the final speed of the other billiard ball? I thought it was 0.6 m/s but it says I am ...
Sunday, March 12, 2017 by Mm

Physics
The figure is just mass A on top of mass B. There are no forces or anything shown. Block A, of mass 3.2 kg, is on block B, of mass 7 kg, as shown in the above figure. The lower block is on a frictionless surface while the coefficient of static friction is 0.25 between the two ...
Sunday, March 12, 2017 by Ana

Physics
A 0.145 kg baseball is thrown at a launch angle of 30° and strikes the ground at 18 m/s. How fast would it be moving when it reaches the ground if it's launch angle were 45°? Ignore air resistance. A. 340 m/s B. 210 m/s C. 16 m/s D. 18 m/s
Sunday, March 12, 2017 by Mm

Physics
An anti-aircraft gun fires at an elevation of 60 degree at an enemy aircraft at 10000m above the ground. At what speed must the cannon be shot to hit the plane at that height? (g=9.8)
Sunday, March 12, 2017 by James

Physics
A solid weighs 4.8g in air, 2.8g in water and 3.2g in kerosene. Calculate the ratio of the density of the solid to that of kerosene
Sunday, March 12, 2017 by Patience

Physics
Six points masses each of mass m are placed at the vertices of regular hexagonal of side l , the forces acting on any of the masses is?
Sunday, March 12, 2017 by Brijender

Physics
the speed of a train increases from 15 mi/h in a distance of 500 ft. calculate the average acceleration in ft/s squared
Sunday, March 12, 2017 by Amel

physics
why does water show abnormal behaviour?
Sunday, March 12, 2017 by Anonymous

physics
A cricket ball travelling north at 100km/h is deflected so that it travels north-east at 100km/h. What is the change in velocity of the cricket ball?
Sunday, March 12, 2017 by Xy

physics
A cricket ball travelling north at 100km/h is deflected so that it travels north-east at 100km/h. What is the change in velocity of the cricket ball?
Sunday, March 12, 2017 by Xy

Math / Physics
A block P of mass 3.56 kg is lying on a rough inclined plane of angle θ = 0.73 radians. Block P is attached via a model string that passes over a model pulley to a second block Q of unknown mass M kg hanging vertically as shown in diagram. The coefficient of static friction ...
Sunday, March 12, 2017 by SL

Physics
A cooking pot contains 0.8kg of water at 100degree celcius what is the specific heat
Saturday, March 11, 2017 by Zona

Physics
HBO is concerned about injuries on the set of their award winning fantasy series Game of Thrones. Star characters are given real swords which have a point of balance (centre of mass) 5.0cm above the top of the handle. For safety reasons, you are given only the 15cm long, 0....
Saturday, March 11, 2017 by Taylor

physics!
Consider an object with a mass of 12.5 kg moving at a constant speed in a circular path with a radius of <11.30> m. The object makes one full revolution in <16.60> seconds. Calculate the centripetal acceleration of the object. Give your answer in m/s2 and with 3 ...
Saturday, March 11, 2017 by yoalin

physics!
Consider an object with a mass of 12.5 kg moving at a constant speed in a circular path with a radius of <11.30> m. The object makes one full revolution in <16.60> seconds. Calculate the centripetal acceleration of the object. Give your answer in m/s2 and with 3 ...
Saturday, March 11, 2017 by yoalin

Physics
A pilot flies his plain in a vertical loop with a radius of 500m. a) what is the speed of the aircraft if the pilot is 'weightless' at the top of the loop? b)what is the weight of the pilot at the bottom of the loop if speed is the same and the pilot is 80kg?
Saturday, March 11, 2017 by Oskar

Physics
Two perpendicular forces have a resultant of 13N.if one of the forces is 5N, the other force is?
Saturday, March 11, 2017 by Jonathan

Physics
One guideline for how diffraction affects shadows is that distinct shadows are created if the width of something is a minimum of 10 times greater than the wave’s wavelength. What would be the narrowest width of something to make a distinct shadow with blue light of frequency...
Friday, March 10, 2017 by Anonymous

physics
a car is driving at 95 km/h down a highway when a deer runs infront of the car 80 m ahead. if the driver immediately applies the brakes and slows down at 4.2m/s^2, what happens?
Friday, March 10, 2017 by sara

physics
The drawing shows three point charges fixed in place. The charge at the coordinate origin has a value of q1 = +8.50 µC; the other two have identical magnitudes, but opposite signs: q2 = -5.50 µC and q3 = 5.5 µC. (a) Determine the net force (magnitude ...
Friday, March 10, 2017 by Anonymous

Physics
A 4700 kg truck on a level surface experiences a force applied due to the engine of 3700 N forward. If the force of friction acting on the truck is 189 N backward: a) Determine the values of the other forces acting on the truck. b) Draw a free body diagram and determine the ...
Friday, March 10, 2017 by Naz

Physics
For a pendulum that completes fifteen complete swings in 34.8 seconds, how much is the frequency?
Friday, March 10, 2017 by Lozzzz

physics
A positive and a negative charge, each with a magnitude of 1.41 x 10^-5 C, are separated by a distance of 0.44 m. Find the force on each of the particles.
Friday, March 10, 2017 by Anonymous

Physics
A magnetic field is uniform in a region of radius 10cm, and increasing at 0.02 Tesla/second. What is the magnitude of electric field in the region outside the magnetic field at radius of 15 cm?
Friday, March 10, 2017 by Mike

Physics
9.) A 1 570 kg satellite orbits a planet in a circle of radius 5.94 x 106 m. Relative to zero at infinity the gravitational potential energy of this satellite is -9.32 x 1011 J. What is the mass of the planet?
Friday, March 10, 2017 by Andy

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