Monday

July 6, 2015

July 6, 2015

**Physics**

A proposed space station includes living quarters in a circular ring 50.5 m in diameter. At what angular speed should the ring rotate so the occupants feel that they have the same weight as they do on Earth?
*Tuesday, December 2, 2014 by Anonymous*

**Physics**

Two blocks with masses m1 = 1.20 kg and m2 = 2.90 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.300. Assume that the pulley has a negligible mass and ...
*Tuesday, December 2, 2014 by Anonymous*

**Physics**

A box of mass 10.9 kg with an initial velocity of 2.01 m/s slides down a plane, inclined at 38◦ with respect to the horizontal. The coefficient of kinetic friction is 1. The box stops after sliding a distance x. The acceleration due to gravity is 9.8 m/s. a. How far does...
*Tuesday, December 2, 2014 by Unknown*

**Physics**

A 284 kg crate is pulled along a level surface by an engine. The coefficient of kinetic friction between the crate and the surface is 0.513. How much power must the engine deliver to move the crate at a constant speed of 7.2 m/s?
*Tuesday, December 2, 2014 by Unknown*

**Physics**

A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
*Tuesday, December 2, 2014 by Anonymous*

**Physics**

An ultrasound pulse from a boat is directed at the sea floor. Ultrasound travels at 1400 m/s. The pulse take 0.5 seconds to return to the boat. What is the depth of the sea in this area?
*Tuesday, December 2, 2014 by Tas*

**Physics**

A cannon barrel is elevated at an angle of 45°. It fires a ball with a speed of 250 m/s. (For the following questions, ignore air resistance.) (a) What height does the ball reach? m (b) How long is the ball in the air? s (c) What is the horizontal range of the cannon? kmp
*Tuesday, December 2, 2014 by Anonymous*

**physics**

A 500kg roller coaster starts from rest at points 35m above the ground level. The car drives down into a valley 4m above the ground and then climbs the top of a hill that is 24m above the ground level. What is the velocity of the car in the valley and at the top of the hill? (...
*Tuesday, December 2, 2014 by cesa*

**physics**

A 6 N box is projected with a velocity of 2 m/s at the bottom of the plane inclined 30 degrees above the horizontal. If friction is neglected, how high up along the plane will it travel before coming to rest?
*Tuesday, December 2, 2014 by cesa*

**physics**

If someone is standing on an edge of a table with a book in his hand.if he is going to fall from the este then What should he do to avoid falling from edge?
*Tuesday, December 2, 2014 by aliya*

**Physics**

We always hear people say “You should conserve energy! Think of what will happen to the next generation if all our energy resources get depleted!” Is this in contradiction with the Law of Conservation of Energy which states that the total amount of energy in the ...
*Tuesday, December 2, 2014 by Brianna*

**Physics**

The figure below shows block 1 of mass 0.200 kg sliding to the right over a frictionless elevated surface at a speed of 5.00 m/s. The block undergoes an elastic collision with stationary block 2, which is attached to a spring of spring constant 1208.5 N/m. (Assume that the ...
*Tuesday, December 2, 2014 by Chelsi*

**Physics**

A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
*Monday, December 1, 2014 by Anonymous*

**physics**

At t = 0 a block with mass M = 5 kg moves with a velocity v = 2 m/s at position xo = -.33 m from the equilibrium position of the spring. The block is attached to a massless spring of spring constant k = 61.2 N/m and slides on a frictionless surface. At what time will the block...
*Monday, December 1, 2014 by stewart*

**physics**

You create a plot of T2 (in s2) vs mass (in kg) and the linear fit of your graph gives a slope of 0.12735 ± 0.01234. What is the value of the spring constant you took the data with? i am not sure what to do. i know the k=1/slope but im not sure how to start to solve ...
*Monday, December 1, 2014 by liz*

**physics-finding velocity**

A small block of mass .450 kg is sliding down a ramp inclined at an angle of 53 degrees to the horizontal. it starts to slide from a vertical height of .65 meters. Find the Velocity when it slides off the ramp. The way I approached this problem was by sing Vf^2-VI^2=2ad. ...
*Monday, December 1, 2014 by Chris*

**physics**

Water flowing through a 1.9-cm-diameter pipe can fill a 500L bathtub in 5.1min. What is the speed of the water in the pipe?
*Monday, December 1, 2014 by anad*

**Physics**

An object is placed to the left of a lens, and a real image is formed to the right of the lens. The image is inverted relative to the object and is one-half the size of the object. The distance between the object and the image is 65 cm. (a) How far from the lens is the object...
*Monday, December 1, 2014 by Elle*

**Physics**

A rectangular trough, 2.0 m long, 0.50 m wide, and 0.50 m deep, is completely full of water. One end of the trough has a small drain plug right at the bottom edge. When you pull the plug, at what speed does water emerge from the hole? (in m/s) Hint: V = sqrt (2 g H I just don...
*Monday, December 1, 2014 by Anna*

**physics**

A spring scale is calibrated from zero to 20. N. The calibrations extend over a length of 0.10 m. (a) What is the elastic potential energy of the spring in the scale when a weight of 5.0 N hangs from it? (b) What is the elastic potential energy when the spring is fully stretched?
*Monday, December 1, 2014 by johnson*

**Physics**

bob drop a rock from a height of 4.5 m. (the acceleration due to gravity is 9.8 m/s^2) 1.at s the initial speed of the rock 2. how long is the rock falling before it hits the ground c. what is the final speed of the rock? [I have trouble with c) My work: a) v1 =0m/s b) v1t +1/...
*Monday, December 1, 2014 by Ash*

**physics**

2. You push a 2.0 Kg block against a horizontal spring (the spring constant is k=200 N/m) compressing it by 15 cm. Then you release the block and the spring sends it sliding across a tabletop. The block stops 75 cm from where you released it. (a) Find the work done by the ...
*Monday, December 1, 2014 by Anonymous*

**Physics**

The windpipe of a whooping crane is about 1.27 m long. Assuming that the pipe is closed at one end, what is the fundamental frequency of this pipe? Answer in Hz and use 340 m/s for the speed of sound.
*Monday, December 1, 2014 by Andy*

**physics**

A stretched string fixed at each end has a mass of 21 g and a length of 5.7 m. The tension in the string is 41.1 N. What is the vibration frequency for the third harmonic? Answer in Hz.
*Monday, December 1, 2014 by Lauren*

**physics**

An airplane traveling at v = 163 m/s emits a sound of frequency 1730 Hz. At what frequency does a stationary listener hear the sound as the plane approaches? Use 340 m/s for the speed of the sound and answer in Hz.
*Monday, December 1, 2014 by May*

**physics**

You take a pendulum clock to the moon, Assuming you do not change anything about the clock, will it still keep the right time? why?
*Monday, December 1, 2014 by Chris*

**physics**

You have a pendulum clock which keeps using a bob on a long shaft. The clock is running slow, You can add or subtract mass from the bobs, or move the bob up and down on the shaft? What should you do to correct the time on the clock?
*Monday, December 1, 2014 by Chris*

**physics**

You test a moon buggy on earth. When the buggy hits a bump, it oscillates up and down on its springs with a period of 4 seconds. Will the period be the same when buggy is used on the moon?
*Monday, December 1, 2014 by Chris*

**Physics**

Two sounds have measured intensities of I1 = 110 W/m2 and I2 = 330.00 W/m2. By how many decibels is the level of sound 1 lower than that of sound 2? Answer in dB.
*Monday, December 1, 2014 by Hannah*

**physics**

a 2.0-kg ball has a momentum of 25 kg*m/s. what is the ball's speed?
*Monday, December 1, 2014 by john*

**physics**

Elephants communicate via infrasound, at frequencies as low as 11 Hz that can travel up to 9 km. The intensity of these sounds can reach 106 dB, measured a distance of 4 m from the source. a) Determine the intensity level in W/m2 of the infrasound at 4 m from the source. b) ...
*Monday, December 1, 2014 by Haley*

**Physics**

An object is placed in front of a converging lens in such a position that the lens (f = 13.2 cm) produces a real image located 23.5 cm from the lens. Then, with the object remaining in place, the lens is replaced with another converging lens (f = 18.8 cm). A new, real image is...
*Monday, December 1, 2014 by Elle*

**Physics**

A jet transport has a weight of 2.03 x 106 N and is at rest on the runway. The two rear wheels are 16.0 m behind the front wheel, and the plane's center of gravity is 12.1 m behind the front wheel. Determine the normal force exerted by the ground on (a) the front wheel and...
*Monday, December 1, 2014 by Jenna*

**Physics**

The wheels, axle, and handles of a wheelbarrow weigh W = 65 N. The load chamber and its contents weigh WL = 538 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man’s hands apply a force to the ...
*Monday, December 1, 2014 by Jenna*

**physics**

The capacitance of a capacitor with a dielectric of air is 1200 pF. When a dielectric is inserted between the plates, the capacitance increases to 0.006 ìF. What is the value of e. ans= 1200/0.006=
*Monday, December 1, 2014 by Eren*

**physics**

a net force of 200 newton's is applied to a wagon for 3 seconds. this causes the wagon to undergo a change in momentum of
*Monday, December 1, 2014 by john*

**Physics**

Find the capacitance of a parallel plate capacitor if 1400 ìC of charge are deposited on its plates when 20 V are applied across the plates.
*Monday, December 1, 2014 by Eren*

**physics**

a net force of 100 newton's is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of
*Monday, December 1, 2014 by john*

**physics**

A rock is thrown downward into a well that is 8.58 m deep. If the splash is heard 1.08 seconds later, what was the initial speed of the rock?
*Monday, December 1, 2014 by Anonymous*

**Physics- formula help**

How do you calculate air resistance on an object if you have how much the object weighs and the acceleration?
*Monday, December 1, 2014 by Mimi*

**physics**

Melaine, Kristin, and Elizabeth's 0.39kg batman is accelerated across a frictionless fishing line from rest to a speed of 15m/s in 1.5 m. How much power is exerted on "Batman"?
*Monday, December 1, 2014 by Sarah*

**physics**

A child on a barber shop spins on a stool. If the child turns counterclockwise through 8.0 radians at a certain time and with an angular velocity of 2.56 rad/s. What is the time interval in minutes when the child turns?
*Monday, December 1, 2014 by Ana*

**physics**

a 50 gram object is accelerating at a rate of 5 m/s2. calculate the force needed to produce this acceleration
*Monday, December 1, 2014 by candace*

**physics**

if a force of 3000 n can move a crate at an acceleration of 10 m/s2, what is the mass of the object
*Monday, December 1, 2014 by candace*

**physics**

a force of 20 n acts on a 5 kg block. calculate the acceleration of the object.
*Monday, December 1, 2014 by candace*

**Physics**

A hollow sphere has a mass of 15 kg, an inner radius of 12 cm and an outer radius of 18 cm. What is the rotational inertia (moment of inertia) of the sphere about an axis passing through its center?
*Monday, December 1, 2014 by Mike*

**Physics**

We always hear people say “You should conserve energy! Think of what will happen to the next generation if all our energy resources get depleted!” Is this in contradiction with the Law of Conservation of Energy which states that the total amount of energy in the ...
*Monday, December 1, 2014 by Hershey*

**Physics**

You may have observed that a car with windows closed sitting under the sun on a hot day, can get extremely hot in the interior, even hotter than the outside air. Explain this in terms of heat and temperature concepts. How is this similar to greenhouse effect? To global warming?
*Sunday, November 30, 2014 by Hershey*

**Physics**

The surface area of an adult human is about 1.8m2 . Suppose a person with a skin temperature of 34 ∘C is standing nude in a room where the air is 25∘C but the walls are 17 ∘C. A) There is a "dead-air" layer next to your skin that acts as insulation...
*Sunday, November 30, 2014 by Drew*

**physics**

The acceleration of gravity is 9.8 m/s 2 . What is the magnitude of the total force on a(n) 87 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 41 m/s in 5.3 s? Answer in units of kN
*Sunday, November 30, 2014 by jo*

**physics**

A simple harmonic oscillator consists of a block of mass 1.20 kg attached to a spring of spring constant 190 N/m. When t = 1.80 s, the position and velocity of the block are x = 0.124 m and v = 3.190 m/s. (a) What is the amplitude of the oscillations? What were the (b) ...
*Sunday, November 30, 2014 by kelly*

**physics**

Atoms in a solid are not stationary, but vibrate about their equilibrium positions. Typically, the frequency of vibration is about f = 4.55 x 1012 Hz, and the amplitude is about 2.69 x 10-11 m. For a typical atom, what is its (a) maximum speed and (b) maximum acceleration?
*Sunday, November 30, 2014 by Nick*

**physics**

A 35kg lawnmower starts from rest. Its pushed with a force of 127N at an angle 40 degrees below horizontal. After 12s it reaches speed of 0.37m/s. Find acceleration and force of friction. Attempts: Well I figured out Fnormal=343 my multiplying mass by gravity and assuming as ...
*Sunday, November 30, 2014 by jamie*

**Physics**

A 1.75-kg wooden block rests on a table over a large hole as in the figure below. A 5.20-g bullet with an initial velocity vi is fired upward into the bottom of the block and remains in the block after the collision. The block and bullet rise to a maximum height of 20.0 cm.
*Sunday, November 30, 2014 by Ana*

**physics**

Two boys stand on the surface of a frozen lake where μs = 0.15 and μk = 0.10. The 30.0 kg boy shoves the 40.0 kg boy with a horizontal force of 50.0 N, 0.0°. Find the resulting acceleration of each boy.
*Sunday, November 30, 2014 by Mush *

**Physics**

A 50 kg cart rests on frictionless surface. A net force of 75 N acts on the carts over a distance of 2m. What maximum speed does the cart reach? Work: I can figure that the acceleration is 1.5m/s/s, Vi= 0. I was thinking maybe if I found time through the kinematic equation d=...
*Sunday, November 30, 2014 by Sam*

**Physics**

A puck (uniform disk) of mass m and radius r is travelingat a speed v on frictionless ice. It strikes a second identical puck a glancing blow (at point P) and sticks to it (using VelcroTM). After the collision, the two-puck-object rotates with angular velocity ω about its...
*Sunday, November 30, 2014 by Alex*

**physics**

with what speed does a hammer dropped from a height of 23 m strike the ground?
*Sunday, November 30, 2014 by Leah*

**physics**

A robot arm expends 15J of work to extend a spring 10cm from its equilibrium position. How much force is required?
*Sunday, November 30, 2014 by Leah*

**physics**

How much work is required to extend an exercise spring 15cm if the spring constant is 800N/m?
*Sunday, November 30, 2014 by Leah*

**physics**

When a 1.50 kg block is 3.96 m above the base of the hill, the mass has a speed of 1.71 m/s. When the block reaches a point 0.750 m above the base of the hill, what is its kinetic energy?
*Sunday, November 30, 2014 by Steve*

**Physics**

A child of mass m is playing on a merry-go-round which has mass 6m and radius r. Assume the merry-go-round is a uniform disk. The child is standing on the edge of the merry-go-round, which is spinning with an angular speed ω1. a) What is the moment of inertia, I1, of the ...
*Sunday, November 30, 2014 by Alex*

**Physics**

A 4.26 kg block starts up a 33.0 degree incline at 7.81 m/s. How far will it slide if the coefficient of kinetic friction is 0.23?
*Sunday, November 30, 2014 by Jennifer*

**Physics**

The acceleration of gravity is 9.8 m/s^2 . What is the magnitude of the total force on a(n) 72 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 61 m/s in 7.8 s? Answer in units of kN
*Sunday, November 30, 2014 by Jackie*

**physics**

How much heat (in kJ) will it take to bring 56 kg of ice at -8°C to dry steam? Answer to 3 significant figures
*Sunday, November 30, 2014 by Anonymous*

**physics **

Ben uses a parachute, to fall to the ground at a safe, steady speed. Discuss the energy transfers, which allow ben and his parachute, to drop at a steady speed.
*Sunday, November 30, 2014 by olivia*

**physics**

A dude is spinning a 1.0 kg mass on the end of a 1.5 meter string. He gets it spinning at a constant rate of 4.0 rev/sec. The string breaks such that the mass is thrown into projectile motion with an initial angle of 45° to the ground (assume that it is launched from ...
*Sunday, November 30, 2014 by hicham*

**physics**

A river is flowing along the east direction with a velocity of 10km/hr. A person heads towards north with a velocity of 2km/hr. what is the velocity of the person with respect to ground?
*Sunday, November 30, 2014 by shreya*

**physics**

an object moves horizontally with a velocity v=20m/s with constant acceleration a=2m/ss.how faar does it move before its velocity is doubled?
*Sunday, November 30, 2014 by ali*

**physics**

a projectile has a maximum range R=150m.find its initial velocity and the corresponding maximum height it reaches. at what angle should it be aimed to hit a target at the same level that is located at a distance x=100m from it?
*Sunday, November 30, 2014 by ali*

**physics**

a force of 10n cause a spring to extened by 20 mm find? the extension of the spring when 25n is applied
*Sunday, November 30, 2014 by mubarak*

**physics**

An unknown mass of a certain solid, initially at 60⁰C, is heated at a uniform at a uniform rate. After 4.0 min the solid reaches its melting point of 80⁰C, and it remains at that temperature for 3.0 min until completely melted. After a further 6.0 min of heating, ...
*Sunday, November 30, 2014 by Alicia*

**physics**

a 20 kg traveler's bag is being pulled along the floor with a force of 50 NF. the force is applied on the handle forming an angle of 30 degree with the horizontal. neglecting friction,what is the acceleration og the bag? How much force is exerted by the floor on the bag?
*Sunday, November 30, 2014 by jhon*

**Physics**

A hollow sphere has a mass of 15 kg, an inner radius of 12 cm and an outer radius of 18 cm. What is the rotational inertia (moment of inertia) of the sphere about an axis passing through its center?
*Sunday, November 30, 2014 by Mike*

**physics**

a body moving at 40 m/s accelerates at the rate of 8m/s^2. what is the distance it transverses in 15 seconds?
*Sunday, November 30, 2014 by ynah*

**physics**

a car is running at 50 mph when the driver starts to step at the breaks. if the car decelerates at the rate of 7 ms^2, how long does it take the car stop?
*Sunday, November 30, 2014 by ynah*

**physics **

The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the total force on a(n) 85 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 60 m/s in 7.2 s? Answer in units of kN So far I have (60-0)/7.2=8.34 but I got ...
*Saturday, November 29, 2014 by Edgar*

**physics**

a 20 kg traveler's bag is being pulled along the floor with a force of 50 NF. the force is applied on the handle forming an angle of 30 degree with the horizontal. neglecting friction,what is the acceleration og the bag? How much force is exerted by the floor on the bag?
*Saturday, November 29, 2014 by jhon*

**Physics**

A point source of light is placed at the centre of the bottom of a jar having a liquid of refractive index 5/3.An opaque disc of radius 1.0 cm is placed on the liquid surface with its centre vertically above the source.What is the maximum height of the liquid for which the ...
*Saturday, November 29, 2014 by Swati*

**Physics**

A ray of light which is incident in air on the surface of the glass block is deviated through 15 degree. The angle of incidwnce in air is 60 degree.What is the angle of refraction in glass?Also calculate the critical angle for glass air interface.
*Saturday, November 29, 2014 by Swati*

**physics**

A cylinder of gas is compressed by a piston from an intial volume of 125 litres to a final volume of 90 litres.The compression occurs at constant pressure and work done on the gas by the piston is 10^4J.What is the gas pressure during compression
*Saturday, November 29, 2014 by takunda*

**collison problem in physics **

I saw this problem half answered already but the answers I got were wrong A 238U nucleus is moving in the x-direction at 4.8×105m/s when it decays into an alpha particle (4He) and a 234Th nucleus. The alpha moves at 1.2×107m/s at 36∘ above the x-axis. a. Find...
*Saturday, November 29, 2014 by James T. *

**Physics**

A 2.00kg solid sphere of radius 5.00cm rolls down a 20 degrees inclined plane starting from rest. (a) What is the magnitude of the acceleration of the center of mass of the sphere? (b) How far down the plane does it roll without slipping in 1.00s?
*Saturday, November 29, 2014 by Nick*

**Physics**

A 10kg mass is located at the (1.00m)i + (2.00m)j + (2.00m)k. A 5kg mass is located at (-1.00m)i + (1.00m)j + (1.00m)k. (A) Determine the moment of inertia of this system about an axis through the origin parallel to the x-axis. (B) Determine the moment of inertia of this ...
*Saturday, November 29, 2014 by Matt*

**physics **

the input to a 93.33 efficient belt drive system is 75 kw. what is the output ?
*Saturday, November 29, 2014 by pash*

**physics**

A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one jet right after the ...
*Saturday, November 29, 2014 by Jason*

**physics PLEASE HELP **

An air column open at one end only is increased in length. The air column first resonates with a given turning fork when the length of the air column reaches 20 cm. The next two consecutive lengths that will resonate with the same tuning fork will measure.
*Saturday, November 29, 2014 by Kiki*

**physics **

Assume that there is no friction between m2 and the incline, that m2 = 1.8 kg, m1 = 1.4 kg, the radius of the pulley is 0.10 m, the moment of inertia of the pulley is 3.6 kg m2, and θ = 27.0°. Mass 1 is hanging vertically while mass 2 is on the incline. After mass 2 ...
*Saturday, November 29, 2014 by Haley*

**physics**

A solid copper object hangs at the bottom of a steel wire of negligible mass. The top end of the wire is fixed. When the wire is struck, it emits a sound with a fundamental frequency of 135 Hz. The copper object is then submerged in water so that half its volume is below the ...
*Saturday, November 29, 2014 by Maka*

**Physics**

A 500.0 g bird is flying horizontally at 2.25 m/s, not paying much attention, when it suddenly flies into a stationary vertical bar, hitting it two-thirds of the way up from the bottom. The bar is uniform and very thin, is 0.750 m long, has a mass of 1.50 kg, and is hinged at ...
*Saturday, November 29, 2014 by Alex*

**PHYSICS**

Two parallel METAL rods form a plane inclined at 20.0° to the horizontal. The upper end of the rods are connected together by a resistor of 118.0 Ω. The lower end of the rods are held in an ELECTRICALLY INSULATING block. They are separated horizontally by a distance ...
*Saturday, November 29, 2014 by Khuan*

**physics**

The temperature of the air is 20.0 degrees Celsius when a tourist drops a coin into a wishing well. She hears the splash 5.30 s after drops the coin. If air resistance is ignored, how deep is the well?
*Saturday, November 29, 2014 by Rose*

**physics**

A metal wedge can be used to split wood pieces. This one has a base only 2 inches across. The length of the wedge is 12 inches. The largest force you can exert with your hammer is 500lbs. As you pound your wedge into the wood, what is the largest sideways force it can exert on...
*Saturday, November 29, 2014 by linda*

**physics**

44 foot skid from a jeep cherokee, how fast was it traveling.
*Saturday, November 29, 2014 by Anonymous*

**physics**

A body describing circular path at uniform speed of 2 m/s takes 33 seconds to complete 3.5 revolutions. Then what wil be the radius of the circular path ?
*Saturday, November 29, 2014 by Fathima*

**physics**

how much ice at -10degree celsius is needed to cool .1 kg of ethyl alcohol and .1kg of water from 20 degree celcius to 5 degree celsius?
*Saturday, November 29, 2014 by alicia*

**Physics**

A perpendicular force of 600n acts on a circular surface of radius 1.4 m. The surface breaks if additional force of 16N is applied on it . What is the maximum pressure that the surface can withstand with.
*Friday, November 28, 2014 by Achintya Sharma *

**physics**

An open ended air column of length 35 cm resonates with a speaker sounding a 500 Hz note. If the air is vibrating in the fundamental mode, what temperature is the air?
*Friday, November 28, 2014 by Kiki*

**Physics **

A 4 kg object is suspended by a string from the ceiling of an elevator. The acceleration of gravity is 9.8 m/s2 . Determine the tension in the string if it is accelerating upward at a rate of 2.4 m/s2. Answer in units of N part 2 Determine the tension in the string if it is ...
*Friday, November 28, 2014 by dale*

**Physics**

Which wave of the following wavelengths could not make a standing wave in a 1.0 m string, with nodes at both ends? A. 2.0 m B. 1.0 m C. 0.75 m D. 0.50 m E. 0.25 m i think the answer is D
*Friday, November 28, 2014 by Rose*