Thursday
January 19, 2017

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
Describe a vibration that is not periodic. I'm not sure how to answer this! Please help?!
Friday, December 23, 2016 by Mark

physics
What should be the minimum initial velocity with which a missile has to be launched so that it reaches a target of 1000km away in the same plane
Friday, December 23, 2016 by Anonymous

physics
A geostationary satellite for communications seems to be in a fixed spot above the equator because it has the same angular velocity as the earth.A) show that if it goes round once a day,its angular velocity is a little over 7×10 race to negative...
Thursday, December 22, 2016 by And

Physics
A lump of lead with mass 0.5kg is dropped from height of 20m onto a hard surface it doesn't rebound but remains there at rest for a long period of time. A, find change in heat , change in work, change in internal energy for the lead during this process?
Thursday, December 22, 2016 by Faf

physics
A pendulum suspended from the roof of a bus moving along a horizontal track makes an angle of 5° with the vertical,,,determine the acceleration of the bus?
Thursday, December 22, 2016 by Lemmy

physics
A child of mass 40kg jumps off a wall and hits the ground at 4m/s he bends his knees and stops in 1s calculate the force required to slow him down how would this force be different if he didn't bend his knees and stopped in 0.1s
Thursday, December 22, 2016 by Anonymous

Science: Physics
We use an electric immersion heater to heat 2,0 liters water having temperature of 20ï‚°C to the boiling point. Specific heat capacity of water is 4,19 kJ/(kg c). The power of the heater is 1,50 kW and efficiency of heating is 80 %. How much time does the heating...
Thursday, December 22, 2016 by karem

Science: Physics
An electric heater of power 2500 W is connected to a voltage of 230 V. i) Calculate the electric current going through the heater. ii) What is the resistance of the heater? iii) How much energy does it consume in a year, if it is switched on 15 min every day. iv) How much it ...
Thursday, December 22, 2016 by karem

Physics
A lump of lead with mass 0.5kg is dropped from height of 20m onto a hard surface it doesn't rebound but remains there at rest for a long period of time. A, find change in heat , change in work, change in internal energy for the lead during this process?
Thursday, December 22, 2016 by Faf

Physics
1. A rectangular coil 0.065 m by 0.080 m is positioned so that its cross-sectional area is perpendicular to the direction of a magnetic field. The coil has 66 turns and a total resistance of 7.6 Ω and the field decreases at a rate of 2.5 T/s. What is the ...
Wednesday, December 21, 2016 by Jake

Physics
A 50 N box is pushed 5 m up a 30 degree inclined plane. What work is done on the box?
Wednesday, December 21, 2016 by Arsh

physics
Heather and Jerry are standing on a bridge 51 m above a river. Heather throws a rock straight down with a speed of 17 m/s . Jerry, at exactly the same instant of time, throws a rock straight up with the same speed. Ignore air resistance. How much time elapses between the first...
Wednesday, December 21, 2016 by pete

Physics -HELP
1. A rectangular coil 0.065 m by 0.080 m is positioned so that its cross-sectional area is perpendicular to the direction of a magnetic field. The coil has 66 turns and a total resistance of 7.6 Ω and the field decreases at a rate of 2.5 T/s. What is the ...
Wednesday, December 21, 2016 by Jake

Physics -HELP
A rectangular coil 0.065 m by 0.080 m is positioned so that its cross-sectional area is perpendicular to the direction of a magnetic field. The coil has 66 turns and a total resistance of 7.6 Ω and the field decreases at a rate of 2.5 T/s. What is the ...
Wednesday, December 21, 2016 by Jake

Physics -HELP
A coil with 337 turns of wire, a total resistance of 47 Ω, and a cross-sectional area of 0.35 m2 is positioned with its plane perpendicular to the field of a powerful electromagnet. What average current is induced in the coil during the 0.30 s that the ...
Wednesday, December 21, 2016 by Jake

physics
A certain vehicle can accelerate from rest to a speed of 25m/s in a time of 8s.What average power is needed to cause this acceleration?Neglect frictional losses
Wednesday, December 21, 2016 by David

physics
A copper wire has a resistance of 1.02 Ω at 20.0°C. What is its resistance at 60°C? The temperature coefficient of resistivity for copper is 0.0039 (C°)—1.
Wednesday, December 21, 2016 by delisA

physics
State the factors that affect the speed and the rotation of the motor
Wednesday, December 21, 2016 by Gerald Muiruri

physics
At ground level g is 9.8meter per second square. Suppose the earth started to increase its angular velocity. How long would a day be when the people on the equator were just 'thrown off' why is the expression thrown off is a bad one?
Tuesday, December 20, 2016 by Andy

Physics
A 13 kg block(mA) rests on a level table. The coefficient of kinetic friction between the block and the table is .15. A string of negligible mass is attached to the block. The string, which is perfectly horizontal, passes through a frictionless pulley at the edge of the table ...
Monday, December 19, 2016 by Anonymous

maths, geography, physics, chemistry
A cuboid has TSA 40 sq. m and latral surface 26 sq. m. Find the base area.
Monday, December 19, 2016 by sneha kaurav

physics
In Figure 10-1, if the force exerted on a 3.0-kg backpack that is initally at rest is 20.0 N and the distance it acts over is 0.25 m, what is the final speed of the backpack?
Monday, December 19, 2016 by aisha

physics
A projectile is fired from the origin (at y = 0 m) as shown in the diagram. The initial velocity components are and The projectile reaches maximum height at point P, then it falls and strikes the ground at point Q, which is 20 m below the launch point. Assuming air resistance ...
Monday, December 19, 2016 by breanna

physics
If a battary of 12vo and 100Ah is used for a 3KVA inverter calculate the maximum current it can produce at maximum load.
Monday, December 19, 2016 by johnkay

Science - physics
If you had to send your laser around a wide corner, which type of mirror could help? Briefly explain how it may help I think this one is a concave mirror
Monday, December 19, 2016 by Kathy

physics (science)
A body travels from rest with acceleration 8m/s square . Find its velocity when it has covered a distance of 100m
Monday, December 19, 2016 by Emmanuella

Physics
A 5.0 kg block with a speed of 2.9 m/s collides with a 10 kg block that has a speed of 2.1 m/s in the same direction. After the collision, the 10 kg block is observed to be traveling in the original direction with a speed of 2.6 m/s. Suppose, instead, that the 10 kg block ends...
Sunday, December 18, 2016 by Alex

physics
A car slows down uniformly from a speed of 24.0 m/s to rest in 4.50 s. How far did it travel in that time?
Sunday, December 18, 2016 by carolyn

physics
Two forces ,whose resultant is 100N are perpendicular to each other .if one of them makes an angle of 60degrees with the resultant calculate its magnitude
Sunday, December 18, 2016 by mirabel

Physics
9. Figure shows an aluminium wire of length 60 cm joined to a steel wire of length 80 cm and stretched between two fixed supports. The tension produced is 40 N. The cross-sectional area of the steei wire is 1.0 mm2 and that of the aluminium wire is 3.0 mm2. The minimum ...
Sunday, December 18, 2016 by Vandit

Physics
A double-slit experiment uses coherent light of wavelength 633 nm with a slit separation of 0.100 mm and a screen placed 2.0 m away.
Saturday, December 17, 2016 by as

Physics
Hello, Could anyone help me with something about rolling motion? Well the question is the next: Does static friction cause a positive work in the rolling motion? I really don't get how the static friction is involved in rolling and if it causes work Please help
Saturday, December 17, 2016 by Mary

Physics
A car is traveling at 50km/h. The driver sees a child run out into the road 5m ahead. She applies the breaks and the car stops in 5s. The driver's thinking time is 1.5s. a. Will the car stop in time? b. If the driver's thinking time is increased to 2.5s, will the car ...
Saturday, December 17, 2016 by Yesuf

Physics
At ground level g is 9.8m/s^2. Suppose the earth started to increase its angular velocity. How long would a day be when people on the equator were just 'thrown off'? Why is the expression 'thrown off' a bad one ?
Saturday, December 17, 2016 by Yesuf

Physics
At ground level g is 9.8m/s^2. Suppose the earth started to increase its angular velocity. How long would a day be when people on the equator were just 'thrown off'? Why is the expression 'thrown off' a bad one?
Saturday, December 17, 2016 by Yesuf

Physics
the co efficient of friction of a plane inclined at 30 degree is 0.4 . Then the acceleration of the body sliding freely on it is?
Saturday, December 17, 2016 by Varun

Physics
An electric fan is rated 240W,25V.Which fuse value is more suitable for the set
Saturday, December 17, 2016 by Efa

Physics
A 650 kg roller coaster car has two points of reference given to an observer. Point A, at a height of 120 m, the cart is moving at 3.40 m/s. Later on in the ride, at point B, the cart is moving at 28.2 m/s. Determine the height at point B. None of the formulas on my formula ...
Friday, December 16, 2016 by Help

Physics uncertainties
A flat head drill bit is used to drill holes of small depth. The drill bit can drill holes with a diameter size of (40 ± 0.5)mm. The depth of the hole has an uncertainty of ±1mm. If the total percentage uncertainty of the volume made by the hole is ...
Friday, December 16, 2016 by Izzy

Physics wave motion
A radar array consists of five vertical antennae arranged in a line, each emitting radio waves of frequency 120MHz in phase with one another uniformly in all directions. The spacing between each of the antennae is 8.0m. Apart from the normal direction perpendicular to the line...
Friday, December 16, 2016 by John

Physics (pressure)
A barometer has air trapped above the mercury in an inverted tube with the opening in a reservoir of mercury. When the length l of air trapped is 10.0cm, the mercury height h is 72.0. When the tube is slightly lowered into the reservoir, l becomes 8.0cm. What is the new h? ...
Friday, December 16, 2016 by Isabel

Physics
This is an Oscillations question. A horizontal plate is vibrating vertically in simple harmonic motion at a frequency of 20Hz. What is the maximum amplitude of vibration so that a coin of 0.0080kg resting on the plate always remains in contact with it?
Friday, December 16, 2016 by Jade

physics
An object of mass 0.50 kg on the end of a string is whirled round in a horizontal circle of radius 2.0m with a constant speed of 10m/s.Find its angular velocity and tension in the string( string is horizontal)answer should be 25.5 N
Friday, December 16, 2016 by Minoli

Physics
1.7 m long pendulum is setup from a 3 m ceiling so that it is at its peak (h=.65 m), it is then released. At the bottom of the swing the string is cut (assume no engery loss during the cutting process) 1.) what is vertical velocity right before it hits the ground? 2.) how far ...
Thursday, December 15, 2016 by marfil

physics
A soccer ball was kicked off a cliff that was h = 8.4 m above the ground. The ball was kicked at a speed of 25 m s-1 and an angle of 20 to the horizon. What is magnitude of the horizontal displacement of the ball? Use g = 9.8 m s-2. proper equation and help plz
Thursday, December 15, 2016 by 123456

physics
Charlie now moved onto the next hole where he hit the ball with an initial speed of 30 m s-1 and at an angle of 60 degrees. This time the ball lands with a speed of 17.3 m s-1. Use g = 9.8 m s-2.
Thursday, December 15, 2016 by qwdsadasd

PHYSICS
Charlie now moved onto the next hole where he hit the ball with an initial speed of 30 m s-1 and at an angle of 60 degrees. This time the ball lands with a speed of 17.3 m s-1. Use g = 9.8 m s-2.
Thursday, December 15, 2016 by PHYSICS

PHYSICS
Terry hit his 26 g golf ball so that it has an initial velocity of 33 m s-1 travelling at an angle of 26 to the horizon. If the ball lands at the same height it was struck, how far will it travel? Use g = 9.8 m s-2.
Thursday, December 15, 2016 by PHYSICS

PHYSICS HELP!!!!!
A soccer ball was kicked off a cliff that was h = 8.4 m above the ground. The ball was kicked at a speed of 25 m s-1 and an angle of 20 to the horizon. What is magnitude of the horizontal displacement of the ball? Use g = 9.8 m s-2. proper equation and help plz
Thursday, December 15, 2016 by physics

PHYSICS HELP
A pilot wants to fly a plane east at a velocity of 400.0 km/hr with respect to the ground. A 50.0 km/hr wind is blowing southward. With respect to the air, what velocity must the pilot maintain?
Thursday, December 15, 2016 by Anjela

physics
A soccer ball was kicked off a cliff that was h = 8.4 m above the ground. The ball was kicked at a speed of 25 m s-1 and an angle of 20 to the horizon. What is magnitude of the horizontal displacement of the ball? Use g = 9.8 m s-2.
Thursday, December 15, 2016 by help

physics
A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 3.05 s. You may ignore air resistance, so the brick is in free fall. (a) How tall, in meters, is the building? (b) What is the magnitude of the brick's velocity just before...
Thursday, December 15, 2016 by kylie

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
Thursday, December 15, 2016 by kylie

physics
A car starts from rest and travels for 5.0 s with a uniform acceleration of +2.5 m/s2. The driver then applies the brakes, causing a uniform negative acceleration of -3.0 m/s2. If the brakes are applied for 2.0 s, how fast is the car going at the end of the braking period, and...
Thursday, December 15, 2016 by kylie

Physics- Energy Released In Chemical Reaction
The reaction between two hydrogen isotopes is shown below: 2H + 3H → 4He + n + energy released The energy released in this reaction is: a.equal to that in a fission reaction b.equal to that in a chemical reaction. c.less than that in a chemical reaction. d....
Thursday, December 15, 2016 by MM

Physics- Car moving with speed of 22 m/s...
A car is moving with a speed of 22 m/s. The driver then brakes, and the car comes to a halt after 6.5 s. What is the distance covered by the car after the driver brakes, until it comes to a stop? a. 36 m b. 72 m c. 140 m d. 219 m
Thursday, December 15, 2016 by MM

Physics-Uncertainty Principle
On the subatomic level, the uncertainty principle creates situations in which ___________ does not apply.
Thursday, December 15, 2016 by MM

Physics
A model rocket has a mass of 0.435 kg. It is mounted vertically and launches directly up with a thrust force of 13.1 N. a) What is the weight of the rocket? b) Determine the net force on the rocket as it is launched. c) What is the acceleration of the rocket at lift-off?
Thursday, December 15, 2016 by Tom

physics
An ore car of mass 41000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 29 m lower vertically, is a horizontally situated spring with constant 4.1 × 105 N/m. The acceleration of gravity is 9.8 m/s2 . Ignore friction. How ...
Thursday, December 15, 2016 by miguel ocampo

Physics
A cardboard box of unknown mass is sliding upon a mythical frictionless surface. The box has a velocity of 4.56 m/s when it encounters a bit of friction. After sliding 0.700m, the box has a velocity of 3.33 m/s. What is the coefficient of friction of the surface? Am I right to...
Thursday, December 15, 2016 by Grace

Physics
A football is kicked at ground level with a speed of 17.7 m/s at an angle of 39.8 ∘ to the horizontal. How much later does it hit the ground? Answer=> t=_____ s Express your answer using three significant figures and include the appropriate units.
Thursday, December 15, 2016 by Jacob

Physics
Problem: A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 "g's. Part A: Calculate the magnitude of the force on a 71-kg person accelerating at this rate. Answer=> F= 2.09x10^4 N Part B: What distance is ...
Thursday, December 15, 2016 by Ashley

physics
A train travelling at 30km/h stops when it's brakes are applied. The train suffers a deceleration our 2m/s. @. How long does the train take to come to rest? b) what is its final velocity?
Thursday, December 15, 2016 by vicky

physics
a circular wheel rotate 200 nos. of revolution in 30 seconds. find its angular velocity
Thursday, December 15, 2016 by prem

physics
What is the angle between A and B vectors for which A+B=A-B ?
Thursday, December 15, 2016 by khan da

physics
A. how long will it take for a 55.0 kg steel brick to fall 75 meters on earth. A. how far from the base will a 55.o kg steel brick to land,(horizontally) if it dropped a vertical distance of 75 meters on earth, and what is its velocity just before it hits the ground?
Thursday, December 15, 2016 by grace

Physics
A 0.50-kg mass is placed on the end of a vertical spring that has a spring constant of 75 N/m and eased down into its equilibrium position. (a) Determine the change in spring (elastic) potential energy of the system. PEs=1/2kx^2=1/2(75)(0.5)^2=9.375 (b) Determine the system&...
Wednesday, December 14, 2016 by Court

physics
Explain why helicopters need 2 rotors to fly in a straight line. Talking about centripetal force.
Wednesday, December 14, 2016 by Stuart

physics
Explain why helicopters need 2 rotors to fly in a straight line.
Wednesday, December 14, 2016 by Stuart

physics
How does a washing machine's 'spin cycle' expel water from clothes?
Wednesday, December 14, 2016 by Ronny

Physics
A soccer player kicks a ball at an angle 45degree with an initial speed of 20m/s,assuming that the ball travels in a vertical plane. Calculate (a) The time at which the ball reaches the highest point. (b) The maximum height reached. (c) The horizontal range of the ball and (d...
Wednesday, December 14, 2016 by Deepankar Roy

Physics
What is the net force required to accelarate a 2000kg car to 6m/sec us equation F=ma
Wednesday, December 14, 2016 by Pj

physics
a cannon of mass 400kg fires a shell of mass 20kg. if the shell leaves the cannon at 300ms^-1, with what velocity does the cannon recoil? an a- particle is emitted from a polonium nucleus at a speed of 1.8 x 10^7 ms^-1. the relative masses of the a- particle and the remaining ...
Wednesday, December 14, 2016 by Josh

physics
What is mean by 28degree east of north
Wednesday, December 14, 2016 by Anonymous

Physics Equilibrium
A table is supported against a wall forming an angle with the vertical. The coefficient of static friction between the table and the floor is (μe). The frictional force of the wall on the board may be neglected. Find an expression for the maximum value that the ...
Tuesday, December 13, 2016 by Laura

physics
A panel is supported on supports a and b. A 60-kg person walks on the board from point a. Despise the deformation of the table A) find its expression for the magnitude of the force exerted by each support in function x of the person B) in what position will the person be found...
Tuesday, December 13, 2016 by daniela

physics
A panel is supported on supports a and b. A 60-kg person walks on the board from point a. Despise the deformation of the table A) find its expression for the magnitude of the force exerted by each support in function x of the person B) in what position will the person be found...
Tuesday, December 13, 2016 by daniela

Physics
A table is supported against a wall forming an angle with the vertical. The coefficient of static friction between the table and the floor is (μe). The frictional force of the wall on the board may be neglected. Find an expression for the maximum value that the ...
Tuesday, December 13, 2016 by Karen

Physics
A force of 1500 N (pull) is applied to a 200-kg crate at an angle of 20 degrees above horizontal. The coefficient of static friction is .65 and the coefficient of kinetic friction is .43. Does the crate move? If so, what is its acceleration?
Tuesday, December 13, 2016 by Anonymous

Physics
What Is Simple Harmonic Motion (SHM)?
Tuesday, December 13, 2016 by Ayo

physics
an annular ring starts from rest and rolls without sliding down a hill from a height of 22.5m. it has an outer radius from 1.0 m and an inner radius of 0.50m. if the moment of inertia of an annular ring in I=1/2M(ro^2 + ri^2), what is th elinear velocity of the ring when it ...
Tuesday, December 13, 2016 by Josue

physics
a 50 kg box sits on a scale in an elevator. the scale reads 400N. what is the acceleration of the elevator? (magnitude and direction)
Tuesday, December 13, 2016 by Josue

Physics
A block slides down a frictionless 3m long inclined plane making 10 degrees with the horizontal. The block starts from rest. Find acceleration of the block and its speed at the bottom.
Tuesday, December 13, 2016 by Gio

Physics
A dart is loaded into a spring-loaded toy dart gun by pushing the spring in by a 
distance d. For the next loading?the spring is compressed a distance d/3. How much 
work is required to load the second dart compared to that required to load ...
Tuesday, December 13, 2016 by Gio

physics
a 1.0 m long rope with a mass on one end swings in a horizontal circle such that the speed of the mass is 1.5m/s. what is the period of motion?
Tuesday, December 13, 2016 by Josue

physics
a large block with a madd of 5kg sits on top of a steep, frictionless hill, which has a height of 45m. what is the velocity of the block by the time it reaches the bottom of the hill?
Tuesday, December 13, 2016 by Josue

Physics
A dart is loaded into a spring-loaded toy dart gun by pushing the spring in by a 
distance d. For the next loading?the spring is compressed a distance d/3. How much 
work is required to load the second dart compared to that required to load ...
Tuesday, December 13, 2016 by Giovanni

physics biology chemistry and ict
WHAT ARE THE ALLOTROPES OF ANTIMONY
Tuesday, December 13, 2016 by SEINI OUSMAN

Physics
Maximum height of the stone above the ground
Tuesday, December 13, 2016 by Fatimah

Physics
The Speed Of A Train Is Reduced From 80km/h To 40km/h In A Distance Of 500m On Applying The Brakes (I)how Much Further Will The Train Travel Before Coming To Rest (II)assuming The Retardation Remain Constant,how Long Will It Take To Bring The Train To Rest After The ...
Tuesday, December 13, 2016 by Victoria

physics
Two forces act on an object. one has a magnitude of 4N in the y axis and the other has a 4N and is pointing 30 degrees below the posive x axis. what is the magnitude of the net force acting on the object?
Tuesday, December 13, 2016 by Josue

Physics
A 6.2 g bullet is fired into a 2 kg ballistic pendulum. The bullet emerges from the block with a speed of 281 m/s, and the block rises to a maximum height of 15 cm . Find the initial speed of the bullet. The acceleration due to gravity is 9.8 m/s 2 . Answer in units of m/s.
Monday, December 12, 2016 by Somya

physics
Una tabla esta apoyada contra un pared formando un ángulo con la vertical. El coeficiente de roce estatico entre la tabla y el piso es ( μe ). La fuerza de roce de la pared sobre la tabla puede despreciarse. Encuentre una expresión para...
Monday, December 12, 2016 by daniela

Physics
A steel cable of cross sectional area 2.5 cm^2 supports a 1000kg elevator. The elastic limit of the cable is 3 x 10^8 Pa. If the stress in the cable is not to exceed 20 percent of the elastic limit, then find the maximum upward acceleration of the elevator
Monday, December 12, 2016 by Cielo

physics
Andy is waiting at the signal. As soon as the light turns green, he accelerates his car at a uniform rate of 8.00 meters/second2. What is the displacement of Andy’s car after 30.0 seconds?
Monday, December 12, 2016 by jakie

physics
Una tabla esta apoyada contra un pared formando un ángulo con la vertical. El coeficiente de roce estatico entre la tabla y el piso es ( μe ). La fuerza de roce de la pared sobre la tabla puede despreciarse. Encuentre una expresión para...
Monday, December 12, 2016 by daniela

physics
A positive charge with Q1= +210-6 C and a negative charge Q2 = -1×10-6 C are located at an equal distance 0.1m from the origin (see below). A third charge Q3=+110-6C is located at the origin. Calculate the magnitude of the net...
Monday, December 12, 2016 by mable

physics
A 2 kg block with initial velocity +2m/s collides with a stationary 6 kg block with initial velocity 0m/s on a frictionless surface. After the collision, the 2 kg block is moving at –1 m/s and the 6kg block is moving to the right at +1 m/s. Show that the ...
Monday, December 12, 2016 by mable

physics
A 100 kg car is traveling at 20m/s over the top of a circular hill as shown below. The radius of the circle is 200 m. What force does the ground exert on the car at the top of the hill? After reaching the top of the hill, the car descends a vertical distance of 20 m. What is ...
Monday, December 12, 2016 by mable

physics
A 2 kg block is being pulled by a rope with a tension of 3N at an angle of 45° as shown. The coefficients of friction are μk=0.4 and μs=0.5. Does the block slide or not?
Monday, December 12, 2016 by mable

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Homework Help: Science