# Homework Help: Science: Physics

## Recent Homework Questions About Physics

Physics
The pilot of an airplane traveling 160 km/h wants to drop supplies to flood victims isolated on a patch of land 160m below. The supplies should be dropped how many seconds before the plane is directly overhead?

physics
Where did the waste energy go to? A ball rolls off the ramp on the edge of a table heading downward and hits the ground. Was the energy lost or gained a direct relation to the distance that the metal ball travelled along the ramp?

physics
What is the uncertainty of a physics lab? What does uncertainty mean? Let's say I'm measuring a height of where the ball is on the ramp and let go of the ball and the ball hits the ground and we use our eyes to see how far the ball lands from the ramp next to another ruler.

Physics
Two forces of 5n and 7n respectively act an object.What is the maximum and minimum resultant of the two forces.Draw a diagram to show the minimum and maximum resultants.

physics
A 2.4 nC charge is at the origin and a -5.6 nC charge is at x = 1.0 cm . a)At what x-coordinate could you place a proton so that it would experience no net force? b)Would the net force be zero for an electron placed at the same position?

Physics
You are required to produce two generalizations: (a) the average weight of a hen’s egg and (b) the average weight of a classroom chalk. You want your conclusion to be as systematic as possible with a limited time and with limited materials. How would the two determinations ...

Physics
I'm confused on where to start. Can someone help break it down. That would be so helpful. 1.) an athlete executing a long jump leaves the ground at a 30° angle and travels 7.80 m. What was the takeoff speed? If this speed were increased by just 5.0 Percent, how much longer ...

Physics
The diameter of our disk-shaped galaxy, the Milky Way, is about 1.7E+5 light-years (ly). The distance to the Andromeda galaxy, which is the spiral galaxy nearest to the Milky Way, is about 1.9E+6 ly. If a scale model represents the Milky Way and Andromeda galaxies as dinner ...

Physics
A piece of copper ball of mass 20 gram at 200 degree celcius is place in a copper calorimeter of mass 60 gram containing 50 grm of water at 30 degree celcius, ignoring heat loses calculate the final steady temperature of the mixture. ( S. H. C of water is 4200j/kgk )

physics
Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. Speaker B is 12 m to the right of speaker A. The frequency of the waves emitted by each speaker is 686 Hz. Sound velocity is 343 m/s. You are standing between the speakers, along ...

Physics/astronomy
How many different photons (photons of different frequencies) can be emitted as a hydrogen atom in the fifth excited state falls back directly or indirectly to the ground state?

physics
Can water be boiled without heating?

agric,physics,life sciences ,pure maths
can i be an agricultural engineer

Physics
Calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one where s=0.072N/m.

physics
a rain drop of radius 0.3mm has a terminal velocity in air 1m/s. the viscosity of air is 18×10^-5 dyne cm^-2 s. find the viscous force on the rain drops in newton.

physics
calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one. where S=0.072N/m

physics
calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one. where s=0.072N/m.

PHYSICS
AN OBJECT OF HEIGHT 5 CM IS PLACED PERPENDICULAR TO THE PRINCIPAL AXIS OF A CONCAVE LENS OF FOCAL LENGTH 10 CM .IF THE DISTANCE OF THE OPTICAL CENTRE OF THE LENS ES 20 CM .DETERMINE THE POSITION ,NATURE AND SIZE OF THE IMAGE FORMED USING THE LES FORMULA.

Physics
Where did the waste energy go to? A ball rolls off the ramp on the edge of a table heading downward and hits the ground.

Physics
How does the weight of a body varies on earth surface?

Physics
Plot a velocity time graph of a motorcycle that accelerates from rest for 10 secs upto a velocity of 20 m/s . It maintains this velocity for a further 20 secs and then retards so that it stops in 20 secs

pure maths, agriculture,life sciences, physics
i want to know what does those subject i choose fall under which career

physics
An enemy plane is flying horizontally at an altitude of 2.0km with a speed of 340m/s.An army man with anti-craft gun on the ground sight the enemy with a muzzle speed at 60m/s .when the enemy plane is directly overhead.find a)at what angle from the verticals should the gun be ...

Physics
A burglar's car in operation alone townA has a start with an acceration of 2m/s^2. A police van came after 5sec and continue to chase the burglar's car wit uniform velocity of 20m/s.find the time take in which the police patroj van will overtake the burglar's car.

Physics
A wave travels a distance of 60cm in 3s. The distance blw successive crests of thd wave is 4cm. What is the frequency?

Science (physics)
How does temperature affect the gas in a balloon?

AP Physics 1
1. A delivery truck travels 21 blocks north, 16 blocks east, and 26 blocks south. What is its final displacement from the origin? Assume the blocks are equal length. 2. Vector V1 is 6.6 units long and points along the negative x axis. Vector V2 is 8.5 units long and points at...

PHYSICS
Why do tachyons increase in speed by decreasing in energy

PHYSICS
Can light accelerate,explain,THANK YOU

Physics
A popular amusement park ride, shown on WB p. 8, operates as follows: riders enter the cylindrical structure when it is stationary with the floor at the point marked "a". They then stand against the wall as the cylinder then begins to rotate. When it is up to speed, the floor ...

physics
A tiger leaps horizontally from a 5.7 m high rock with a speed of 3.9 m/s. How far from the base of the rock will she land?

physics
A 550.27 N force is moving a 396.46 kg block at a constant velocity across a wooden plank. What is the kinetic friction force?

physics
A 550.27 N force is moving a 396.46 kg block at a constant velocity across a wooden plank. What is the kinetic friction force?

physics
A 19.62 kg block is sliding down a 34.52 degree incline at a constant velocity. What is the mu k of kinetic friction between the incline and the block?

Physics
A 543-N physics student stands on a bathroom scale in an 805-kg (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 473 N A) Find the magnitude of the acceleration of the elevator.

physics
a book accidentally falls from a shelf 4.2 m high.a librarian is standing nearby and moves .80m,starting from rest, to catch the book.what must be his average acceleration if he catches the book when it is 1.8m above the floor?

Physics
A cat can move at 1ms it wants to get straight across a 2m wide sidewalk moving left at .5 ms what angle should the cat direct itself

mec113 or physics
(1)what is welding (2)what are the advantage and disadvantage of welded point (3)list and explain the various types of joint normaly used in welding (4)what do you understand by welding (5)list out the equipment required for oxy-acetylene welding (6)discribe with the aid of ...

Physics
A boy throws a rock with an initial velocity of 1.67 m/s at 30.0° above the horizontal. If air resistance is negligible, how long does it take for the rock to reach the maximum height of its trajectory? Vi = 1.67 sin 30 = 0.835 m/s v = Vi - 4.9 t v = 0 0 = 0.835 - 4.9 t ...

Physics
If the substance of 1kg mass is converted completely into energy then how many kilowatt energy will be produced?

Physics
An 89.5 kg fullback moving east with a speed of 5.7 m/s is tackled by a 81.5 kg opponent running west at 2.58 m/s, and the collision is perfectly inelastic. (a) Calculate the velocity of the players just after the tackle. m/s (b) Calculate the decrease in kinetic energy during...

physics
the sidewalk moves left at 0.5 m/s. it is 2m long. a cat runs a 1m/s and it wants to run straight across to get to its food. at what angle should the cat direct itself? and how long would the cat take to cross the sidewalk

Conceptual Physics
A paperback is 106mm in width. What is the width in centimeters? In meters? (I need to see this in steps)

Physics
You have two tuning forks. One is a known frequency of 200 Hz. The second for his plate, there is a big frequency of five beats per second. What a piece of gum is placed on the second fork, the frequency increases three beats per second. What is the frequency of the second ...

Physics
Ive tried numerous methods, but I cant seem to get this right. Please help, and explain step by step. An object's position is given by x=bt+ct^3, where b=1.50m/s and c=0.640m/s3. To study the limiting process leading to the instantaneous velocity, calculate the object's ...

Physics
An archer shoots and arrow horizontally at a target 15m away. The arrow is aimed directly at the center of the target, but it hits 52 cm lower.how long did it take for the arrow to reach the target

general physics
a person horizontally pushes a 25 kg couch. Applied force is 18N and average resistive force is 7N. its pushed from rest to a final speed of 2.3 what is the distance pushed the time taken and the power delivered to push couch

physics
a disk i = 0.7 kgm and radius 60 cm is rotating a 12 rpm. there is an external torque applied to the outer edge and the rotational speed increases to 35 rpm in 8 sec. angular acceleration? angle the disk rotates? magnitude of applied force (assume tangential)?

Physics
A 40kg mass hangs from two cables. One cable is at a 25 degree angle. The other cable is horizontally attatched to the mass. Find the tension for each cable

physics
a string of lenght l and mass m is lying on a horizontal table. a force f is applied at one of its end.tension on the string at a distance y from the end at which the fprce applied is ?

physics
light year is a unit of?

physics
a boy of mass 40 kg hanging from the horizontal branch of a tree .the tension in his arms is minimum when the angle between the arms?

physics
Solid A of mass 50 kg resting on a smooth 45º incline is maintained in equilibrium by means of the light string passing over the pulley and holding at its other end a solid B of mass m. Make the inventory of the forces acting on A. Determine graphically the magnitude of the ...

Physics
An airplane needs to accelerate at 4.7 m/s2 to reach take-off speed before reaching the end of the runway. The mass of the airplane is 4500 kg. How much force is needed from the engines?

physics
Find the turn ratio in a transformer which deliver a voltage of 120volts in the secondary coil form a primary voltage at 60v. Please someone should help me with this

Physics
A negatively charged balloon has 4 μC of charge. How many excess electrons are on this bal- loon? The elemental charge is 1.6 × 10−19 C. Answer in units of electrons.

physics
a sluice gate consists of a quadriant of a circle of radius 1.5m pivoted at its center 0. When the water is level with the gate, calculate the magnitude and direction of the resultant hydrostatic force on the gate and the moment required to open the gate.The width of the gate ...

Physics
The Earth exerts an 640 N gravitational force on a man. What force does the man exert on the Earth? Answer in units of N.

PHYSICS
A ball is thrown upwards .the distance covered by it during of last 2 second before it reaches the maximum height is ???? Find answer

Physics II
Assuming equal point charges, calculate the magnitude of the charge in C if the electrostatic force is great enough to support the weight of a 1.95 mg piece of tape held 1.05 cm above another?

Physics II
A test charge of +2 μC is placed halfway between a charge of +6 μC and another of +4 μC separated by 10 cm. What is the magnitude of the force on the test charge?

Physics
If a 1350 kg minivan hits a barrier with a force of 2500 n and stops in 2.8 sec, how fast must the minivan have been traveling?

Physics
A 0.500 kg object is thrown vertically upward with an average applied force of 8.20 N by a student. The force is applied through a displacement of 1.50m. a. What is the average net force acting on the object? b. What is the velocity of the object when it leaves the student's ...

Physics
How many electrons pass a given point in the circuit in 17 minutes? The fundamental charge is 1.602•10^-19. And the current is 0.526315789

Physics
A steel ball of mass 8.0 kg and traveling at 3.0 m/s [E] has a head-on elastic collision with a brass ball which is at rest. After the collision, the velocity of the brass ball is 4.0 m/s [E]. Find: a)the velocity of the steel ball after the collision b) the mass of the brass ...

physics
Assume the truck is going at v0 = 25 m/s, and you're 20 m behind the truck. You decide to accelerate at a = 1.0 m/s2 to pass the truck. To pass safely, you also want to pass the truck by 20 m before moving back to the lane. Part A ) Estimate the time interval needed to pass a ...

PHYSICS
In your moving car, you covered 2.0 m during the first 1.0 s, 4.0 m during the second 1.0 s, 6.0 m during the third 1.0 s, and so forth. Find the acceleration.

Physics
Blood flow rates in the umbilical cord can be found by measuring the Doppler shift of the ultrasound signal reflected by the red blood cells. If the source emits a frequency f, what is the measured reflected frequency fR? Assume that all of the red blood cells move directly ...

Physics
A 0.15kg bullet is fired into a 1.85kg block that is hanging from a 45cm string. What minimum initial bullet speed is required if the bullet and block are to make one complete revolution? Please show all work. I need this question answered as soon as possible!

Math/Physics
Lil decides to estimate the height of the Empire State Building. She measures the angle θ of elevation of the spire atop the building as 19°. After walking x = 9.10 ✕ 102 ft closer to the building, she finds the angle to be 23.8°. Use Lil's data to estimate the ...

Physics
Two forsec of 5N and 7N act on an object. What are the maximum and minimum of the two forces

physics
an object with a mass of 1500g accelerates 10.0 m/s2 when an unknown force is applied to it. What is the amount of the force?

Physics
How many electrons pass a given point in the circuit in 17 minutes? The fundamental charge is 1.602•10^-19. And the current is 0.526315789

physics
A homogeneous rod AB=100 cm of mass m=4kg is suspended from a fixed roof by means of two very light strings OA and O'C having the same length point C is at 20cm from B , rod AB is in a horizontal position of equilibrium Make the inventory of the forces acting on the rod AB.

physics
A 55.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300. What horizontal force must be applied to the box for it to start sliding along the surface?

physics
In the outer space, a constant force is applied to a 32.5 kg probe initially at rest. The probe moves a distance of 100 m in 10 s. (a) What acceleration does this force produce? (b) What is the magnitude of the force?

Physics
An object moves with acceleration given by a = -6t^3 m/s^2. Its initial velocity at t = 0 is 5 m/s. How far will it move before stopping? ((((((The answer is " 7.5 m " ))))) Can you please show me the solution.

Physics
How fast must a plane fly at a latitude of 41.9° so that the sun stands still relative to the passengers?

Physics
12 kg wagon is being pulled at an angle of 38o above horizontal. What force is applied to the wagon if it accelerates from rest to a speed of 2.2 m/s over a distance of 3.4 m? Is this question a typo? Am I supposed to solve for force or work? Physics - silverback, Tuesday, ...

Physics
12 kg wagon is being pulled at an angle of 38o above horizontal. What force is applied to the wagon if it accelerates from rest to a speed of 2.2 m/s over a distance of 3.4 m? Is this question a typo? Am I supposed to solve for force or work?

Physics help
A 75.0 kg novice skier is going down a hill with several secondary hills. Ignore frictional effects and assume the skier does not push off or slow himself down. If the initial hill is 38.7 m above the chalet level: (8 marks) a) What is the speed of the skier at the bottom of ...

physics
A box rests on a frozen pond, which serves as a frictionless horizontal surface. If a fisherman applies a horizontal force with magnitude 48.0 N to the box and produces and acceleration of magnitude 3.00 m/s squ, What is the mass of the box?

physics
A ware house worker pushed a crate along the floor, as shown in fig 4.34, by a force of 10N that points downward at an angle of 45 degrees below the horizontal. Find the horizontal and vertical components of the push.

Physics
A boulder is raised above the ground so that the ground is 200j . Then it is dropped. What is its kinetic energy before it hits the ground?

physics
A ball is thrown up onto a roof, landing 4 sec later at height of 20m above the release level. The balls path just before landing is angled at 60 degree with the roof. a) find the horizontal distance d it travels. b) what is the magnitude of the balls initial velocity? c) what...

physics
A block of mass m1=3.70kg on a frictionless plane inclined at angle 30 deg is connected by a cord over a massless, frictionless pulley to a second block mass m2= 2.30kg. What is... a) The magnitude of the acceleration of each block? b) The direction of the acceleration of the ...

PHYSICS 1
The vector signs are above each letter (I just don't know how to show it that way) A= 145 units @ 190 deg. B= 75 units @ 288 deg. C= 210 units @ 85 deg. D= 105 units @ 355 deg. How do I use the component Method with these given magnitude and degree??? Physics Component Method...

PHYSICS
Is it a must that a nucleus must have opposite nature with the electron

PHYSICS
can an atom exist without a nucleus

Physics Component Method
The vector signs are above each letter (I just don't know how to show it that way) A= 145 units @ 190 deg. B= 75 units @ 288 deg. C= 210 units @ 85 deg. D= 105 units @ 355 deg. How do I use the component Method with these given magnitude and degree???

physics!
A point charge of +5 μC is located at the center of a sphere with a radius of 12 cm . What is the electric flux through the surface of this sphere ?

physics
Three equal positive point charges q are at the corners of an equilateral triangle with sides of length a. What is the magnitude and direction of the electric field at one corner of the triangle due to two charges placed on another two corners of the triangle ?. These two ...

physics
The distance between two charges q1 = -2.5 μC and q2 = 6.0 μC is equal to 1.0 m. Determine the point (other than infinity) at which the electric field is zero.

Physics
How much work does a weightlifter do on a 450 N barbell thathe lifts 2m into the air

Physics
a 100 N chandelier hangs from the ceiling on 8 chains. What is the tension force on each chain?

Physics
You want to pull a 35 kg steel safe across a pine floor. If the coefficient of static friction between steel and pine is .5, ow hard must you pull to get the safe to move

physics
A 31.0 kg child on a swing reaches a maximum height of 1.92 m above their rest position. Assuming no loss of energy: a) At what point during the swing will she attain their maximum speed? b) What will be her maximum speed through the subsequent swing? c) Assuming this maximum ...

Physics
A 1 kg apple sits on a table. What is the normal force of the table acting on the apple?

Physics
Sarah walks 300 m North ,50 m East and then she walks 300 m South. What is the displacement? Thanks in advance too!!

Physics
A 31.0 kg child on a swing reaches a maximum height of 1.92 m above their rest position. Assuming no loss of energy: a) At what point during the swing will she attain their maximum speed? b) What will be her maximum speed through the subsequent swing? c) Assuming this maximum ...

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