# physics please HELP !

74,851 results, page 73-
## physics.

Describe constructive and destructive interference in terms of the combining of crests and troughs and the reesulting amplitude. -
## physics

a body travels from rest with acceleration 8ms find its velocity when it has covered a distance of 100m -
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What is the strength of the magnetic field a distance of 1 meter from a wire carrying a current of 1 A? equation: B=MoI ------ 2(pi)r Mo=4(pi)x 10^-7 I=1 A How do I know what r is? -
## Physics

What is the free-fall acceleration in a location where the period of a 0.594 m long pendulum is 1.55 s s? Answer in units of m/s -
## physics

he speed of light in a vacuum is about 3.00 108 m/s how many kilometers a pulse from a laser beam travels in exactly 3.9 hours. -
## PHYSICS

1. A 500.0 g metal block absorbs 1.125 × 104 J of heat to raise its temperature by 50.0 K. What is the substance? -
## physics

An airplane accelerates down a runway at 3.33 m/s2 for 35.3 s until is finally lifts off the ground. Determine the distance traveled before takeoff. -
## Physics

Two objects attract each other gravitationally with a force of 2.3×10−10 when they are 0.21 apart. Their total mass is 4.50 . Find their individual masses. -
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An object sits 29m above the ground and has a mass of 47 kg. How much potential Energy does it posses 1.5 seconds after falling? -
## physics

What is the net force on a Mercedes convertible traveling along a straight road at a steady speed of 100km/h? -
## Physics

Intravenous infusions are often made under gravity. At what height should the bottle be placed so the liquid pressure is 700 mm-H2O? -
## Physics Dynamics

An arrow has an initial launch speed of 32 m/s. If it must strike a target 38 m away at the same elevation, what should be the projection angle? -
## physics

A weight suspended from a spring is seen to bob up and down over a distance of 50 centimeters 2 times each second. What is its frequency? What is its period? What is its amplitude? -
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What is the angular separation between the first-order images on either side of the central maximum? Answer in units of degrees. -
## physics

How can the LIGO gravity wave detector achieve a measurement accurate to 1/1000 of a proton's diameter -
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what minimum initial velocity must aprojectile have to reach atarget at a distance of 25m away?(use g=10m/s square) -
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What is the minimum velocity needed for a roller coaster , traveling on the ground , to make it over a 112 m hill? -
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let p and E denote the linear momentum and energy of emitted photon respectively if the wavelength of incident radiation is increased---- -
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A tennis ball is thrown directly upward with an initial speed of 25 m/s. What is its velocity in m/s when it hits the ground? -
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at what angle with respect to the horizontal should the shot put be launched if the starting height is 2.0m to have the greatest range? -
## Physics

If a person can have a hang time of .75 seconds, how long would it take that individual to go from the ground to the highest point of their jump? -
## Physics help

how would you investigate if the half life of water dripping from a burette is constant? I know the method but what equation and principle would ya'll use? -
## physics

How much kinetic energy is gained by an electron that is allowed to move freely through a potential difference of 2.5 × 104 V? -
## PHYSICS

What's the total mechanical energy of a 300kg satellite in circular orbit 1400km above Earth's surface? -
## physics

when you do work to push an object horizonatally on a frictionless surface what energey change is taking place? -
## honors physics

What is the minimum velocity for a tolerant coaster traveling on the ground to make it over 112 m hill -
## physics

Mitch carries a large cat from one end of his bedroom to the other.does he do any work?if not why? if so,what energy change is occurring? -
## Physics

5kg rock is dropped into a well and a splash is heard after 3 seconds , how deep is the well? Ignore air resistance -
## Physics

An object is dropped from rest. What is its instantaneous speed when it has been in motion for 5 s? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s -
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A rotating wheel as an initial angular velocity of 10rad/s and 2.5rad/s^2.how many revolution does it will complete in 30seconds? -
## physics

A ball initially at rest rolls down a hill with an acceleration of 2.7 m/s2. If it accelerates for 8.1 s, how far will it move? Answer in units of m. -
## Physics

A person with a mass of 55kg climbs a tower with a height of 11m in 25 minutes. What power is produced? -
## Physics

A roller coaster travels 41.9 m at an angle of 15.0◦ above the horizontal. How far does it move horizontally? Answer in units of m -
## physics

A 0.150-kg ball, moving in the positive direction at 12 m/s, is acted on by the impulse of 4N*s what is the balls final velocity -
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What is the total internal kinetic energy of 16.2 moles of a monatomic ideal gas at a temperature of 279 K? KE = -
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scientific interpretation of two toy cars having bar magnet on the roof .what happen when close to each other from same and different direction? -
## Physics

if a molecules in a solid has a temp of T = hf/2k then what would be the average energy of vibration 1) 0.88kT 2) 0.47kT 3) 0.62kT 4) 0.31kT -
## PHYSICS

A 3.1 kg bundle starts up a 30° incline with 139 J of kinetic energy. How far will it slide up the plane if the coefficient of friction is 0.30? -
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if a race cars velocity increases from 4 m/s to 36 m/s over a 4 s time interval, it average acceleration would be 10 m/s2. would this be true or false ? -
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A tennis ball is released at 30 degrees. It reaches max height of 20 ft find initial speed -
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A positive and a negative charge, each of magnitude 1.7 10-5 C, are separated by a distance of 11 cm. Find the force on each of the particles. what formula do i use? -
## physics PLEASE I NEED HELP

Wally now lift the box of the floor and put it on a shelf. Does he doing any work? If not why? If so .what energy change is accurring? -
## physics

Wally now lift the box of the floor and put it on a shelf. Does he doing any work? If not why? If so .what energy change is accurring? -
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what is the symbolic expression for the wavelength ë of a photon in terms of its energy E, Planck's constant h, and the speed of light c. -
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a pendulum of length L=9.8m hangs in equilibrium and is then given velocity v=0.2m/s at its lowest point.What is the magnitude of the subsequent oscillation? -
## Physics

Given a free falling object that is initially at rest, what are the objects displacement, velocity, and acceleration after 9 seconds? -
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A baseball bat is rotating at 350rpm(revolutions per minute) at contact. What is the angular velocity in radians per second? -
## Physics

Six charge equal to Q are placed at the corners of regular hexagon of each side x,what is the electric potential at the intersection of the diagonals? -
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How long does it take a plane, traveling at a constant speed of 166 m/s, to fly once around a circle whose radius is 4000 m? -
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Two forces of the same magnitude act at a point.the square of their resultant is 3 times the product of their magnitudes.the angle between them is? -
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Explain the statement: the saturation vapour pressure of water at 60 degree Celsius is 149.4 mm of Mercury. Thanks -
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on a cool night with no wind, people facing a campfire feel a breeze on their backs explain -
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you chop 50 g of ice at 0 degrees celsius into 200g of water at 40 degress celcius. What is the final temperature? -
## physics hw

Determine the stopping distances for a car with an initial speed of 87 km/h and human reaction time of 2.0 s for the following accelerations. (a) a = -4.0 m/s2 (b) a = -8.0 m/s2 -
## Physics

Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characteristic radiation characteristics? -
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What is the pressure at a depth of 80 m in the ocean? The density of seawater is 1. 03 × 10 3kg/m3. Please express your answer in units of atm. -
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A violin string vibrates at 298 Hz when unfingered. At what frequency will it vibrate if it is fingered one sixth of the way down from the end? -
## Physics

According to special relativity, at high speeds the distance between distant locations is: a) shortened b) no different than if you were at rest c) lengthened -
## Physics

What is the pressure at a depth of 80 m in the ocean? The density of seawater is 1. 03 × 10 3kg/m3. Please express your answer in units of atm. -
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A lamp operates with a current of 0.625A and a potential difference of 120V. What is the currnt flowing through the microwave? -
## PHYSICS

A cell phone emits signs in approximately 750 Mhz. Which is the wavelength and energy of this radiation -
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calculate the energy consumed by a computer(150 W) that is used for 2.0 hours and a laser(250 W) that is used for 10 min? Answer is 1.2 Mj -
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Why do many musicians wear earplugs during their performances even though the intensity of the sounds produced is lower than the threshold of pain? -
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Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 4800 km. -
## AP Physics

How fast (in rpm) must a centrifuge rotate if a particle 6.0 cm from the axis of rotation is to experience an acceleration of 130000 g's -
## Physics

a bus moving at a speed of 20m/s begins to slow at a constant rate. Find how far it goes before stopping? -
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For a certain projectile, the horizontol range is twice in magnitude of the maximum height attained by it. Find its angle of projection. -
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5. A bomber is flying at a height of 9 km at 800 km/h. How far in front of the target should he drop his bombs? show formulas* -
## Physics

Two 1.5 kg balls move away from each other, one traveling 6 m/s to the right, the other 2 m/s to the left. What is the magnitude of the total momentum of the system? Answer in units of kg · m/s -
## PHYSICS

Calculate the maximum amount of stretching (in percent) that a piece of steel can undergo before breaking under tension -
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A square conducting slab with 7 m sides carries a net charge of 89 mu or micro CC. what is the electric field? -
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If you were to burn a candle under equal masses of water and iron for the same amount of time, would one increase in temperature more than the other? which one? -
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Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 3.004km. -
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A car traveling 28 mi/h accelerates uniformly for 6.7 s, covering 555 ft in this time. What was its acceleration? Answer in units of ft/s 2 -
## Physics

Your friend doesn't believe you when you tell her that the acceleration due to gravity on earth is the same for both light and heavy objects. How could you convince her? -
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What is the shortes possible time in which a bacterium could travel a distance of 8.4 cm across a Petri dish at a constant speed of 3.5mm/s? -
## Physics

Two point charges that have charge values of 4.0 X 10^-6 C and -8.0 X 10^-6 C, respectively, are separated by 2.4 X 10^-2 m. What is the mutual force between them, given that kC = 8.99 X 10^9 Nm^2/C^2? I got the Felectric as -5.0 X 10^2 N, but I'm not sure -
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one side of a square bolck is 20 cm. the block weighs 320 grams. which numeral could be used to express the density? is it 0.04, 0.25, 16, or 25? -
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How many calories of heat are required to convert 230 grams of ice at -10.0C to a gas with a temperature of 1500C? -
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Determine the magnitude of the force of gravity acting on a 340 kg satellite, 850 km above Earth's surface -
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If the coefficient of kinetic friction is 0.24, how much work do you do when you slide a 55 kg box at constant speed across a 5.4 m -wide room? -
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Which principle can be applied to explain what happens to the pitch of a sound as the source comes closer and close,pass the listener and away? -
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m1=4kg and m2=2kg and angle is 42 degrees.if the mass m2 is moving down with 0.5 m/s^2 acceleration, find the coefficient of the friction -
## SPR,PHYSICS

A block of wood floats in water with two-Third of its volume submerged its relative density is equal to? -
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A longitudinal wave spreads radially from a source with power 345 W. What is the intensity 40.0 meters away? answer in W/m^2. -
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dave is traveling in his car at 16m/s. he maintains this speed for 60 seconds. what is his acceleration in meters per second squared? -
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A plane flies at 150m/s at 35 degrees east of north. It encounters a wind from the west blowing 26 m/s. -
## Physics

Since friction is a force, how do you determine its magnitude and direction? Use a box sliding across a carpet to illustrate your answer -
## physics

a circular wheel rotate 200 nos. of revolution in 30 seconds. find its angular velocity -
## physics

a pendulum of length L=9.8m hangs in equilibrium and is given velocoity v=0.2m/s at its lowest point.What is the magnitude of the subsequent oscillation? -
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Two protons are moving directly toward one another. When they are very far apart, their initial speeds are 1.5e6 m/s. What is the distance of closest approach? PLEASE HELP! im very confused. -
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compute the acceleration of a 1500-N block sliding down a 30 degrees incline. Assume friction is negligible -
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A loudspeaker emits energy equally in all directions at the rate of 1.75J/s. What is the intensity level at a distance of 15 m? -
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Sam tosses a ball horizontally off a footbridge at 4.8 m/s. How much time passes after he releases it until its speed doubles? -
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A bullet is shot straight down at a speed of 3.9 m/s. After 2.3 seconds, how fast is it moving? Use 10 m/s2 for gravity. Give answer in m/s. -
## URGENT! PHYSICS

HI! I searched on a lot of websites for this, but none of them actually was right for me. I need to do an egg drop withh only straws and glue/tape. Thanks! -
## Physics Help!

Find the total kinetic energy content of 1.55 moles of an ideal gas at temperature 435 K -
## Physics

A person is jogging at 3.5 m/s and grabs a rope that is hanging vertically from a tree. How high can the student swing? -
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a stone of mass 50g is released from rest, Calculate it's kinetic energy after 6s from the beginning of the motion -
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determine the center of mass for three particles(1.5, 2.5, 3.5) forming a equilateral triangle one side lenght of 135cm.