Thursday

August 25, 2016
**Physics**

A box is pushed across a floor with a force of 2.8 N at an angle of 26.8 degrees above the horizontal. How much work, in Joules, must be done to move the box a distance of 8.3 m?
*Thursday, April 21, 2016 by Amolica*

**Physics**

A baseball of mass 0.25 kg is hit so hard that it bounces on the ground and winds up in a spectator’s seat. If the ball leaves the ground at a speed 8.2 m/s and lands in the seat with a speed of 2.3 m/s, at what height, in metres relative to the ground, is the spectator?
*Thursday, April 21, 2016 by Amolica*

**Physics**

A 0.32 kg box of macaroni is held in place at the front of a 3.31 kg shopping cart only by the force of static friction as the shopping cart accelerates. Determine the minimum acceleration, in m/s 2, that the shopping cart must have if the box is to be kept from falling if the...
*Thursday, April 21, 2016 by Catherine*

**Physics**

A particular Ferris wheel takes you through one complete revolution every 25.3 seconds. If the radius of the Ferris wheel is 10.4 m, and your mass is 63.3 kg, calculate: (a) Your apparent weight, in N, when you are at the top of the Ferris wheel. (b) Your apparent weight, in N...
*Thursday, April 21, 2016 by Catherine*

**Physics**

A 2 kg block is resting on a 37 degree frictionless inclined plane, attached by a string to a frictionless pulley at the top of the plane, over which a second mass of 3.3 kg hangs down. Find the magnitude of the hanging mass’s acceleration.
*Thursday, April 21, 2016 by Catherine*

**Physics**

A powered model airplane of mass 1.7 kg is tied to a ceiling with string and allowed to fly at speed 0.21 m/s in a circular path of radius 0.86 m while suspended by the string which makes a constant angle with respect to the vertical. (a) What is the angle, in degrees, that ...
*Thursday, April 21, 2016 by Catherine*

**Physics**

A 410 kg race car is rounding a curve in the road which is banked at an angle of 23.4 degrees from the horizontal. Assume that there has just been a massive snowfall and the road’s surface is frictionless. What must the radius of the curve be if the car is travelling at a...
*Thursday, April 21, 2016 by Catherine*

**Physics**

A small disc of mass 0.7 kg is attached to a string on a frictionless table top. The string passes through a small hole in the centre of the table and is attached to a mass of 0.68 kg suspended below the table and above the floor. The disc can thus move in a circular path with...
*Thursday, April 21, 2016 by Catherine*

**Physics**

A 570 kg truck is carrying a large 1.9 kg box on its cargo deck when it starts to accelerate. If the coefficient of static friction between the box and the truck’s deck is 0.26, what is the maximum acceleration, in m/s 2, that the truck can have without letting the box slip?
*Thursday, April 21, 2016 by Catherine*

**physics**

The drawing shows an outstretched arm (0.61 m in length) that is parallel to the floor. The arm is pulling downward against the ring attached to the pulley system, in order to hold the 126-N weight stationary. To pull the arm downward, the latissimus dorsi muscle applies the ...
*Thursday, April 21, 2016 by regn*

**Physics**

A 4.7 gram feather falls with a constant speed of 1.4 m/s. What is the force of air resistance on the feather?
*Thursday, April 21, 2016 by Amanda*

**Physics**

In a twist of tradition, you pull a sled horizontally with a force of 3.3 N on a frictionless surface of snow while your dog is sitting inside the sled. If the sled accelerates at 1.27 m/s 2, and the sled’s mass is 2.8 kg, what is the mass of your dog?
*Thursday, April 21, 2016 by Amanda*

**Physics**

A ball travelling at 9.5 m/s is stopped by catching it by hand over a distance of 0.24 m. What is the mass of the ball if the force required to stop it over this distance is 6.4 N?
*Thursday, April 21, 2016 by Amanda*

**Physics**

A 7.5 kg box is pushed across a floor by pushing forward and down, with a force of 11 N at an angle 64 degrees from the horizontal floor. What is the normal force exerted by the floor onto the box?
*Thursday, April 21, 2016 by Amanda*

**Physics**

You are enjoying the frictionless frozen surface of the Rideau canal with your friend. While together, you try a physics experiment in which you push off of each other at the same time. If your acceleration is 2 m/s 2, what is your friend’s acceleration, in m/s 2, if your...
*Thursday, April 21, 2016 by Melissa*

**Physics**

You and your friend are pulling a 2.5 kg sled across a slightly rough patch on the frozen Rideau canal, such that there is a friction force of 1.5 N opposing the direction of motion. Assume that you each pull the sled forward from either side with the same force of 9.5 N, at ...
*Thursday, April 21, 2016 by Melissa*

**Physics**

A box is sent up a frictionless inclined (34.2 degrees) plane at an initial speed 3.9 m/s. (a) How much time, in seconds, does it take for the box to stop? (b) How far did the box travel up the plane before it came to a stop?
*Thursday, April 21, 2016 by Melissa*

**Physics**

While in an elevator, you decide to take some weight readings of yourself to determine the elevator’s acceleration. When the elevator is stopped, you read a weight of 59.2 kg. When the elevator is moving, you measure a maximum weight of 63.5 kg, and a minimum weight of 55...
*Thursday, April 21, 2016 by Melissa*

**physics**

A hiker, who weighs 915 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 4185 N, and rests on two concrete supports, one at each end. He stops one-fifth of the way along the bridge. What is the magnitude of the force that a...
*Thursday, April 21, 2016 by regn*

**Physics**

A 70 cm diameter wheel is rotating at 1 300 revolutions per minute and a small 5g mass is fixed to the outer edge of the wheel. Calculate the strength and direction of the centripetal force that is exerted on the mass.
*Thursday, April 21, 2016 by Mathew*

**Physics**

A wire loop of radius 0.165 m lies so that an external magnetic field of strength +0.24 T is perpendicular to the loop. The field changes to −0.32 T in 0.759 s. Note: The plus and minus signs here refer to opposite directions through the coil. Find the magnitude of the ...
*Thursday, April 21, 2016 by Abby*

**Physics**

A source passing a stationary observer is emitting a frequency of 560 Hz. If the speed of sound is 345 m/s, what must speed of the source be if the frequency speed is 480 hz? Here's what I've tried... Fo=480 Hz FObs = 480 + 560 VSource = ?(x) Vsound = 345 m/s I try to ...
*Thursday, April 21, 2016 by AlphaPlus*

**PHYSICS**

The initial temperature of a bomb calorimeter is 28.50°C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45°C. If the calorimeter has a mass of 1.400 kg and a specific heat of 3.52 J/(gi°C), how much heat is absorbed by ...
*Thursday, April 21, 2016 by Caleb*

**physics question help plz!**

1-What is the shape of the trajectory of a charged particle moving in a uniform electric field if its initial velocity is null? 2-What is the shape of the trajectory of a charged particle moving in a uniform electric field if its initial velocity is perpendicular to the field...
*Thursday, April 21, 2016 by bob*

**Physics**

Find the minimum aperture diameter of a camera that can resolve detail on the ground the size of a person (1.5 m ) from an SR-71 Blackbird airplane flying at an altitude of 26 km . (Assume light with a wavelength of 470 nm .) I got 570 mm which is wrong
*Thursday, April 21, 2016 by Hannah*

**physics**

A typical red blood cell subtends an angle of only 1.7×10−5 rad when viewed at a person's near-point distance of 25 cm. Suppose a red blood cell is examined with a compound microscope in which the objective and eyepiece are separated by a distance of 13.0 cm . ...
*Thursday, April 21, 2016 by jacob*

**Physics**

Consider a metal rod that is 1.42 m in length at a temperature of 14.4°C. The coefficient of linear expansion is 5.22×10-5°C-1. What is the change in length of the rod as temperature increases from 14.4°C to 52.0°C.
*Thursday, April 21, 2016 by Emily*

**physics question**

1-What is the shape of the trajectory of a charged particle moving in a uniform electric field if its initial velocity is null? 2-What is the shape of the trajectory of a charged particle moving in a uniform electric field if its initial velocity is perpendicular to the field...
*Thursday, April 21, 2016 by bob*

**physics**

I have a typical Opamp diode log amplifier. formula for it is.Vout=-Vth*ln(Vin/IsR) The positive side of amp has a resistor and then is tied to ground.How does that extra resistor impact my standard forumla.
*Thursday, April 21, 2016 by bearinthewoods*

**Physics**

Two cylinders having weights of 100 kN and 200 kN with radii of 100 mm and 200 mm are placed with heavier weight above the lighter weight and both of them are placed in a container having a width of 500 mm. Assuming that the length of the container and cylinder to be the same...
*Thursday, April 21, 2016 by van*

**Physics**

The volume flow rate in an artery supplying the brain is 4.59E-6 m3/s. If the radius of the artery is 5.33 mm, determine the average blood speed.
*Wednesday, April 20, 2016 by Emily*

**physics**

An electric dipole is made of two charges of equal magnitudes and opposite signs. The positive charge, q = 1.0μC, is located at the point (x, y, z) = (0.00cm, 1.0cm, 0.00cm), while the negative charge is located at the point (x, y, z) = (0.00cm,−1.0cm, 0.00cm). How ...
*Wednesday, April 20, 2016 by mela*

**Physics**

An egg is thrown from the top edge of a 22.9 m high building down onto an unsuspecting person standing on the ground 6.2 m from the base of the building. If the egg is tossed horizontally, at what speed, in m/s, must the egg be thrown such that it lands on the person?
*Wednesday, April 20, 2016 by Melissa*

**HELP PHYSICS PLS :)**

A 15 g bullet strikes and embeds in a 2.1 kg block suspended at the end of a 1.2 m string. After the collision the string rises to a maximum angle of 22 degrees to the vertical. what is the speed of bullet? what I did MASS OF BULLET = 0.015 KG i found the height of when it ...
*Wednesday, April 20, 2016 by amelia*

**physics**

A rotating door is made from four rectangular sections, as indicated in the drawing. The mass of each section is 70 kg. A person pushes on the outer edge of one section with a force of F = 74 N that is directed perpendicular to the section. Determine the magnitude of the door...
*Wednesday, April 20, 2016 by regn*

**Physics**

62kg person in an elevator is moving up at a constant speed of 4.0m/s for 5.0s a) calculate the work done by the normal force on the person. b) calculate the work done by the force of gravity on the person . c) How would your answer change if the elevator were moving down at 4...
*Wednesday, April 20, 2016 by lomonoyan*

**Physics**

Initially a battery circuit consists of a 25 ohm load connected to a battery with 3 ohms of internal resistance and the circuit draws 1.5A of current. What is the terminal voltage and EMF of the batter? How much (%) power is wasted? Please help, this doesn't make sense ...
*Wednesday, April 20, 2016 by Alec*

**Physics**

Imagine we have two identical batteries with emf = 1.8V and an internal resistance of 0.6 ohms. Now we connect the batteries to a circuit with total resistance of 50 ohms. What is the maximum amount of power we can dissipate in the 50 ohm load? what is the minimum?
*Wednesday, April 20, 2016 by Suzy*

**Physics**

A block of mass M=0.525kg is floating stationary in a beaker of water. A string connected to the bottom of the beaker holds the block in place. The tension in the string is 7.10 N. The bottom of the block is floating a distance h=1.66cm above the bottom of the beaker. What is ...
*Wednesday, April 20, 2016 by Emily*

**Physics **

The human heart discharges 75ml of blood at each beat against the pressure of 0.1mmHg. Calculate the power of the heart assuming that the purse frequency is 80 beats per minute.(density of mercury is 13.6*10^3 Kg/m3)
*Wednesday, April 20, 2016 by Ben*

**Physics**

If the average gauge pressure in the artery is 1.41E+4 Pa, what must be the minimum height, h of the bag in order to infuse glucose into the artery? Assume that the specific gravity of the solution is 1.04.
*Wednesday, April 20, 2016 by Sam*

**Physics**

An observer watching a fireworks display sees the light from the explosion and hears the sound 2 seconds later.How far was the explosion from the observer?
*Wednesday, April 20, 2016 by Muchori*

**physics**

The (non-conservative) force propelling a 1.40 x 103-kg car up a mountain road does 7.60 x 106 J of work on the car. The car starts from rest at sea level and has a speed of 22.0 m/s at an altitude of 2.50 x 102 m above sea level. Obtain the work done on the car by the ...
*Wednesday, April 20, 2016 by Anonymous*

**physics**

Spring of 20cm extend to 30cm under a force of 10N.what will be its total length when extended by a force of 10N?
*Wednesday, April 20, 2016 by polao*

**Physics**

Calculate the kinetic energy of a car of mass 1200kg moving at 1.8m/s The car engine is Switched Off calculate the height the could rise up a hill before coming to rest if there is no energy loss due to friction assume g= 10N/kg Into what form has the kinetic energy been ...
*Wednesday, April 20, 2016 by Evans*

**Physics**

a 2x10^-6 point charge travels a distance of.002m between two parallel charged plates from the negative end toward the positive end. The field has a strength of 500 N/C What is the change in voltage?
*Wednesday, April 20, 2016 by John*

**Physics**

A lighter block (2 kg) and a heavier block (8 kg) sit on a frictionless surface. Both blocks are initially at rest. The same force of 4 N then pushes to the right on each block for a distance of 9 m. What are the changes in kinetic energy of the blocks? What are the final ...
*Wednesday, April 20, 2016 by Anonymous*

**Physics**

A car is moving such that its kinetic energy is 6.20×105 J. The car accelerates and the engine does 2.90×105 J of work to accelerate the car. What is the final kinetic energy of the car? Ignore energy lost to friction. (Your answer must be accurate to at least 1%. ...
*Wednesday, April 20, 2016 by Anonymous*

**Physics**

A 588.6 kN car moving at 1 km/hr instantaneously collides an stationary 392.40 kg car. If the collision is perfectly inelastic, what is the velocity of the car after collision?
*Wednesday, April 20, 2016 by ced*

**physics **

Two cars of the same mass collide head -on and become tangled so that they move on together. If the engines of both were stopped at the moment of impact and the speeds of the cars impact were 120m/s ,find the joint velocity immediately after collision
*Wednesday, April 20, 2016 by Hussein *

**physics, english, chemistry, maths**

A girl whose mass 404g walk up a flight of 20steps each 150mm height in 10s find the average power developed Hint g = 10m/S
*Wednesday, April 20, 2016 by ellah*

**physics**

A uniform magnetic field is establish perpendicular to the plane of a loopof radius 14cm.Resistance 40ohmn, and negligible self-induce.The magnitude of the field increase at a rate of 400mT/s. (i)Find the induce emf in the loop (ii)the induced current in the loop and (iii)The ...
*Wednesday, April 20, 2016 by Christopher livinda*

**Physics**

If a car can accelerate at a rate of 15 m/hr/sec how long will it take the car to get to 65 m/hr from a dead stop?
*Wednesday, April 20, 2016 by Quin*

**Physics**

If a car can accelerate at a rate of 15 m/hr/sec how long will it take the car to get to 65 m/hr from a dead stop?
*Wednesday, April 20, 2016 by Anonymous*

**Physics**

The Atwood Machine consists of two masses suspended form a fixed pulley. If the first mass is 0.55kg and 0.8kg, (a) what is the acceleration of the system? (b) What is the magnitude of the tension in the string? (consider the pulley to be frictionless and the masses of the ...
*Wednesday, April 20, 2016 by Raphael Grenfell*

**physics **

A 43.0-kg boy, riding a 2.20-kg skateboard at a velocity of 5.30 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 8.00° above the horizontal. Ignore any ...
*Tuesday, April 19, 2016 by brad*

**Physics helpppp**

250 g ball of putty moving horizontally at 9 m/s collides with and sticks to a block lying on a frictionless horizontal surface. If 20%of the kinetic energy is lost, what is the mass of the block? What i did Mass1 = 0.25 kg Mass 2 =? Kinetic initial = 1/2(0.25)(9)^2 = 10.125 J...
*Tuesday, April 19, 2016 by PHYSICSSSS HELP*

**physics**

A stationary bicycle is raised off the ground, and its front wheel (m = 1.3 kg) is rotating at an angular velocity of 12.3 rad/s (see the drawing). The front brake is then applied for 3.0 s, and the wheel slows down to 3.3 rad/s. Assume that all the mass of the wheel is ...
*Tuesday, April 19, 2016 by nj*

**physics**

A 9.94-m ladder with a mass of 21.6 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 226 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular acceleration of 1.71 rad/s2 ...
*Tuesday, April 19, 2016 by nj*

**physics**

A 0.280 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. (a) What is the mass of the second ball? (b) What fraction of the original kinetic energy (ΔKE/KE) ...
*Tuesday, April 19, 2016 by GG*

**physics **

A car with a mass of 1100kg can accelerate on a level road from rest to 2m/s in 14sec.what is the steepest slope this car can climb.(hint:the plane is smooth.)
*Tuesday, April 19, 2016 by lily*

**Physics**

A child sitting 1.80 m from the center of a merry-go-round moves with a speed of 1.45 m/s . Calculate the centripetal acceleration of the child.Calculate the net horizontal force exerted on the child. (mass = 28.5 kg )
*Tuesday, April 19, 2016 by Brittney*

**Physics **

Use the work-energy theorem to solve each of these problems. You can use Newton's laws to check your answers. Neglect air resistance in all cases.
*Tuesday, April 19, 2016 by Bout*

**Physics**

An electric field measured near a point charge of 3.0 X 10^-6 C has a strength of 1.50 X 10^5 N/C How far is the point from the source charge
*Tuesday, April 19, 2016 by John*

**Physics**

A -6 x10^-6 point charge is .030 m from another point charge and experiences a repulsive fore of 180 N what is the magnitude of the other charge
*Tuesday, April 19, 2016 by Tina*

**Physics**

In the Biomedical and Physical Sciences building at MSU there are 135 steps from the ground floor to the sixth floor. Each step is 16.0 cm tall. It takes 5 minutes and 40 seconds for a person with a mass of 63.9 kg to walk all the way up. How much work did the person do? What ...
*Tuesday, April 19, 2016 by Kevin*

**physics**

A capacitor A1B1 of capacitance C1=2microF is charged under a voltage U1=20V and then isolated. a) Calculate the voltage U (A1B1) between its plates, and it's charge Q1 and energy W1. b) The plates A1 and B1 are connected to those A2 and B2 of an uncharged capacitor of ...
*Tuesday, April 19, 2016 by angy*

**science-college physics**

2. A certain wire of length L, cross-sectional area A is extended by an amount ‘e’ by a force F. Given that the young’s modulus of the material of the wire is E, Show that the; a. Energy stored in the wire is given by the expression (5) b. Energy per unit volume...
*Tuesday, April 19, 2016 by hamunyela morga*

**Physics**

In the Biomedical and Physical Sciences building at MSU there are 135 steps from the ground floor to the sixth floor. Each step is 16.0 cm tall. It takes 5 minutes and 40 seconds for a person with a mass of 63.9 kg to walk all the way up. How much work did the person do? What ...
*Tuesday, April 19, 2016 by Kevin*

**Physics**

An ocean liner leaves New York City and travels 25.1 degrees north of east for 110km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ships displacement vector in the directions, a) due east and b) due north
*Tuesday, April 19, 2016 by Ellie*

**Physics**

one charge of +10 uC is placed at the origin, a second charge of +5uC is placed at (2cm, 4cm) and a third charge (-15 uC) is placed at (4cm, 1 cm). What is the magnitude and direction of the electric force exerted on the first charge by the other two? I drew out the triangle, ...
*Monday, April 18, 2016 by Alec*

**Physics**

If one charge (+5 uC) is placed at origin and a second charge of (+7 uC) at x = 100 cm, then where can a third charge be placed and of what size, so that it has no electrostatic force on it. I know the magnitude of the force will not matter, however, I'm not sure as to how...
*Monday, April 18, 2016 by John*

**Physics**

An object is placed 18m from a screen. At what points between the object and the screen may a lens with focal length of 4m be placed so that an image can form on the screen. I have an exam in a few days, and this is one example my prof never really explained, he just stated. ...
*Monday, April 18, 2016 by William*

**PHYSICS**

When a car engine is turned off, the angular speed of the flywheel decreases linearly with time from 1200 rev/min to zero. a) Find the average angular acceleration b) How many revolutions does the flywheel make before stopping?
*Monday, April 18, 2016 by Hammad*

**Physics**

Calculate the acceleration of a car that is travelling at a constant speed of 100 km per hour on a straight road. The radius R of the Earth is 6370 km. Why do we not feel this acceleration?
*Monday, April 18, 2016 by Hammad*

**science-college physics**

1. A mass of 20 kg is suspended at the end of a rubber cord of diameter 2.0 mm and length 100 cm. Find the period of vertical oscillations of the mass. [Take young’s modulus E, for the rubber = 2.0 x 108 Nm - 2].
*Monday, April 18, 2016 by hamunyela morga*

**physics **

Two bodies a and b masses 4kg and 2kg move towards each other with velocities 3m/s and 2m/s and collide. If the collision is perfectly inelastic, find the velocity of the 2 bodies after collision. Find the tolal kinetic energy of the system before and after collision, hence ...
*Monday, April 18, 2016 by wealth *

**physics**

David Wetterman drops a 5 kg watermelon from the top of a 30 m building. What is the velocity of the watermelon as it smashes into the ground (neglecting air resistance)?
*Sunday, April 17, 2016 by Eli Garrett*

**Physics**

An elevator and its load have a total mass of 800kg .find the tension T in the supporting cable when the elevator originally moving downwards at10m/s is brought to rest with constant acceleretion in distance of25m
*Sunday, April 17, 2016 by Abidemi*

**Physics**

A Ball Of Mass 0.25kg Losses Half Of Its Velocity When It Makes A Head On Collision With An Identical Ball Q At Rest.After The Collision,Q Moves off with a speed of 2m/s in the original direction of p.calculate the initial velocity of p.
*Sunday, April 17, 2016 by Richard*

**Physics**

Brett stats from rest on his skateboard and accelerates at 0.5 m/s2 [N] for 12s, and then maintains his velocity for 15s before falling off his board. He slides along on his back until he comes to rest, accelerating at -2.4 m/s2. a) Calculate the highest instantaneous velocity...
*Sunday, April 17, 2016 by Nancy*

**physics little folks **

a mass is attached at the spring perform SHM with frequency of 15 hz find the acceleration when displacement is 1.6cm
*Sunday, April 17, 2016 by raahim*

**Physics**

A string is 2.4 m long, and the speed of sound along this string is 450 m/s. Calculate the frequency of the wave that would produce a first harmonic. Assume the string has nodes at both ends. What I've Tried Ln=2.4m v= 450 m/s f=? n=2 Ln=(4-1)/4 * Wavelength Wavelength = 2...
*Sunday, April 17, 2016 by AlphaPlus*

**Physics**

Home Economics Math Music Physical Education Science Social Studies GRADE LEVELS Preschool Kindergarten Elementary School 1st Grade 2nd Grade 3rd Grade 4th Grade 5th Grade 6th Grade 7th Grade 8th Grade High School 9th Grade 10th Grade 11th Grade 12th Grade College Adult ...
*Sunday, April 17, 2016 by Rameel*

**Physics**

A brick has mass 10kg and dimensions (10*5*20)cm Find the maximum and minimum pressure it can exert on ground
*Sunday, April 17, 2016 by Clive*

**physics**

The drawing shows a jet engine suspended beneath the wing of an airplane. The weight W with arrow of the engine is 11900 N and acts as shown in the drawing. In flight the engine produces a thrust T with arrow of 64500 N that is parallel to the ground. The rotational axis in ...
*Sunday, April 17, 2016 by nj*

**physics**

a helium nuclide of mass M1 moving with initial velocity V is incident on a stationary of mass M1. After collision M1 was deflected through an angle x and M2 an angle y. If the velocities of the nuclides after collision were V1 and V2 respectively, show that for an elastic ...
*Sunday, April 17, 2016 by Henry*

**Physics**

The volume of a fixed mass of a gas is 200cm cube at 27 degrees celcius.calculate its temperature when the volume is reduced to 1/2 its original at the same temperature
*Sunday, April 17, 2016 by Nimi*

**physics**

before 1900 the activity per mass of atmospheric carbon due to the presence of carbon-14 averaged about 0.255bq/g of carbon 1. what fraction of carbon is carbon-14
*Sunday, April 17, 2016 by jay*

**physics**

before 1900 the activity per mass of atmospheric carbon due to the presence of carbon-14 averaged about 0.255bq/g of carbon 1. what fraction of carbon is carbon-14
*Saturday, April 16, 2016 by jay*

**physics!**

In its search for flying insects, a bat uses an echolocating system based on pulses of high frequency sound. These pulses are 2.0 ms in duration, have a frequency of 50 kHz, and an intensity level of 100 dB at 1.0 m from the bat’s mouth. Assume the bat produces acoustic ...
*Saturday, April 16, 2016 by Jamie*

**physics**

After giving an intense performance, a confused and disoriented flautist has wandered onto the motorway! They are playing a constant 300Hz on their flute and are essentially stationary If you are driving along the motorway at 100 km/h(27.8 m/s). What is the frequency you hear ...
*Saturday, April 16, 2016 by TOM*

**Physics**

PHYSICS HELP PLS!!How does the equation of a displacement v. speed graph (cart moving down an incline through a speed gate) relate to the work-energy principle. Pls answer asap! Thanks!
*Saturday, April 16, 2016 by PLS HELP!!*

**physics 11**

Timmy twirls a dead rat (mass = 2 kg) attached to a rusty chain (length = 1m) in a vertical circle. With what velocity should Timmy rotate the rodent so that the chain just goes slack (no force in the chain) at the top? pls answer :(
*Saturday, April 16, 2016 by Jeremy*

**PHYSICS **

Mars rotates slowly about its axis, the period being 687 days. The mass of mars is 6.39 x 10^23 kg. Determine the radius for a synchronous satellite in orbit around Mars. (assume circular orbit)
*Saturday, April 16, 2016 by Kelly*

**physics HELP PLS :(**

Mark saxby is set to kick the field goal to win the state championship for Olathe East. He is 47.0m away from the goalposts and he kicks the ball at a speed of 25.0m/s at an angle of 30.0 degrees. (a.) If the cross bar on the goalposts is 3.00m above the ground will the ball ...
*Saturday, April 16, 2016 by Debbie*

**Physics**

An elliptical loop of wire has an area of 2m^2.The magnetic field coming out of the page starts from zero and increases according to B(t)=3t^3 Tesla.(a)At what point in time will the voltage measured across 10 ohm resistor is 1 volt.(b)What will be the magnitude and direction ...
*Saturday, April 16, 2016 by Samrah*

**physics**

a body starting from rest attains a speed of 8 m/s in 2 seconds. find the acceleration of the car.
*Saturday, April 16, 2016 by har!@#$%^&a*

**Physics**

Jason approaches a rotary in her 3,500kg Mercedes. Its radius of curvature 95m but his speed is 25m/s. The acceleration is 6.6 m/s^2. What is the coefficient friction between his tires and the road? I know Mu mg=mv^2/R but I am unable to complete my equation and continue to ...
*Friday, April 15, 2016 by Rosie*

**physics**

Trevor skis down a hill at a speed of 25 m/s. Friction slows him down to a speed of 20 m/s. Which free-body diagram shows the forces acting on him
*Friday, April 15, 2016 by diana ramirez*