Sunday
February 26, 2017

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
An ideal spring hangs vertically from the ceiling. When 1.0 kg mass hangs from the spring it is extended 5.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10 cm. While the spring is being extended by the ...
Sunday, February 26, 2017 by Nicole

Physics
The horizontal surface on which the block slides is frictionless. The speed of the block before it touch the spring is 6.0 m/s. How fast is the block moving at the instant the spring has been compressed 0.15 m? The spring constant, k = 2000 N/m
Sunday, February 26, 2017 by Nicole

physics-sound
A police car moving at 41 m/s is initially behind a truck moving in the same direction at 17 m/s. The natural frequency of the car's siren is 800 Hz. The change in frequency observed by the truck driver as the car overtakes him is __(Hz) Take the speed of sound to be 340m/s.
Sunday, February 26, 2017 by chloe

physics
A person jumps out of a helicopter in mid-air to retrieve a small metal ball. He screams at 475Hz, but people on the ground hear him scream at 578Hz. The person is falling at __(m/s) Once he grabs the metal ball, he is pulled back up to the helicopter at the same speed as he ...
Sunday, February 26, 2017 by chloe

Physics
A bullet with mass (m) is fired vertically into a block of wood with mass (M) that is hanging from a rope at rest. If the billet has an initial speed Vi (initial velocity) find the height (h) that the block will swing into the air after the bullet becomes embedded in it m=0....
Sunday, February 26, 2017 by Stephy

physics
A ball is thrown upward with velocity 5m/s calculate total distance covered by it ?{ Using formulae (v)2 -(u)2. =2gs}
Sunday, February 26, 2017 by Mohasin wani

Physics
An 80g particle moving with an initial velocity of (50m/s)î strikes and sticks to a 60g particle moving at (50m/s)j. How much kinetic energy is lost in this collision?
Sunday, February 26, 2017 by Gorg

physics
A (10.25) kg bowling ball is hung on a (11.50) m long rope. It is then pulled back until the rope makes an angle of (39.0) degrees with the vertical and released. Find the speed of the ball is at the lowest point. Give your answer in m/s and with 3 significant figures.
Saturday, February 25, 2017 by l

Physics
The box is being pulled by a roope across a level floor as shown in the diagram. The box is accelerating at 1 m/s2, the coefficient of kinetic friction is 0.5. what is th tension in the rope?
Saturday, February 25, 2017 by Sarah

Physics help please
excited by the in class experiments you put two speakers in your living room 80cm apart producing a sound of 750Hz. 4.0 m away you place a microphone right on the centerline between the speakers. Will the microphone detect a loud sound or a soft on at this point (relatively to...
Saturday, February 25, 2017 by Naida

PHYSICS
On vacation, your 1400-kg car pulls a 520-kg trailer away from a stoplight with an acceleration of 2.00 m/s2 . A: What is the net force exerted by the car on the trailer? Assume that the positive x axis is directed toward the direction of motion. F = N What force does the ...
Saturday, February 25, 2017 by LISA

PHYSICS
An object acted on by three forces moves with constant velocity. One force acting on the object is in the positive x direction and has a magnitude of 6.2 N ; a second force has a magnitude of 5.0 N and points in the negative y direction Find the magnitude of the third force ...
Saturday, February 25, 2017 by AMY

Physics
you are skiing down a slope angled at 30 degrees to the horizontal. Your acceleration is 2m/s^2. what is the coefficient of kinetic friction between you and the hill?
Saturday, February 25, 2017 by Sarah

Physics
A ball is dropped from a building, after 2 sec another ball is thrown downward. After 6 sec the second ball overtook the first ball. Is the second ball has greater acceleration than the first ball? Explain.
Saturday, February 25, 2017 by Heeelp

help with physics
Excited by the in class experiments you put two speakers in your living room 80cm apart producing a sound of 750Hz. 4.0 m away you place a microphone right on the centerline between the speakers. Will the microphone detect a loud sound or a soft on at this point (relatively to...
Friday, February 24, 2017 by nina

physics help please
The lecturer with a monotone voice of 440 Hz and you are both 2m away from the long, smooth and tall wall. You will hear sound that comes directly to you from the lecturer along with sound that comes back from the wall on it’s way to reaching you. You need the path here ...
Friday, February 24, 2017 by nina

Physics
A 200 gram sample of hot water at 89°C is mixed with 200 grams of cool water at 16°C. Assume there is no loss of heat energy to the surroundings, what is the final temperature of the mixture when they reach thermal equilibrium?
Friday, February 24, 2017 by Kat

Physics
A 100 gram mass of metal at 106°C is placed in 100 grams of cool water at 22°C. The final temperature of the mixture is 25°C. What is the specific heat capacity of the metal?
Friday, February 24, 2017 by Kat

physics
A ball is fired at a speed of 8 m/s at 20˚ above the horizontal from the top of a 5 m high wall. How far from the base of the ball will the ball hit the ground? Also calculate the angle below horizontal the velocity vector makes.
Friday, February 24, 2017 by yara

Physics
The lecturer with a monotone voice of 440 Hz and you are both 2m away from the long, smooth and tall wall.You will hear sound that comes directly to you from the lecturer along with sound that comes back from the wall on it’s way to reaching you.You need the path here needs ...
Friday, February 24, 2017 by josh

physics
An electron is projected horizontally at a speed of 3x10^6 m/s into a uniform electric field 200 N/C produced by two charged plates of width 0.1m (a) find the a cceleration of the electron in the elec field.(b) finn the time takes to travel through the electric field.(c) what ...
Friday, February 24, 2017 by rahidul

physics
Consider a balloon of mass 0.030 kg being inflated with a gas of density 0.54 kgm-3. What will be the volume of the balloon when it just begins to rise in air of density 1.29 kg m-3? [g = 10 ms-2]
Friday, February 24, 2017 by Divine

Physics
A stone with a mass of 20kg and density of 20,000kg/m3 is immersed in water. Find its weight
Thursday, February 23, 2017 by Victory

physics
A ball moving at a velocity of 10 meters/second has a momentum of 8.0 kilogram meters/second. What is its mass?
Thursday, February 23, 2017 by Anonymous

Physics
A 77 kg man climbs the stairs to the fifth floor of a building, a total height of 15.2 m. What is his potential energy in Joules when he reaches the fifth floor? Round your answer to 1 decimal place.
Thursday, February 23, 2017 by Colten

physics
The index of refraction of water for a given monochromatic light in water is n=4/3. The wavelength of this light in water is 500nm.  a) find the speed of this light in water.  b) find the energy of one photon of this light . Does this energy change if this light is ...
Thursday, February 23, 2017 by vicky

Physics
The lecturer with a monotone voice of 440 Hz and you are both 2m away from the long, smooth and tall wall. You will hear sound that comes directly to you from the lecturer along with sound that comes back from the wall on it’s way to reaching you. You need the path here ...
Thursday, February 23, 2017 by kailey

Physics 202
In a lecture hall you sit 12 m directly in front of one of the two speakers on the front of the hall. The second speaker is 8m from the first in line with the front of the room, so that the speakers and you form a triangle with a 90° angle. What frequencies in the human ...
Thursday, February 23, 2017 by Alisa

Physics
a uniform beam 6.0m long and weighing 4kg rest support p and q place left and right 1.0m of beam of weight from each of the beam weight of mass 10kg and 8kg and are placed near p and q respectively on each of the beam. calculate the reaction of p and q
Thursday, February 23, 2017 by Olalekan

Physics
a uniform beam 6.0m long and weighing 4kg rest support p and q place left and right 1.0m of beam of weight from each of the beam weight of mass 10kg and 8kg and are placed near p and q respectively on each of the beam. calculate the reaction of p and q
Thursday, February 23, 2017 by Olalekan

physics
1. A cylinder tank is 30m deep,calculate the pressure extended at the bottom of the tank,when it is four-fifth filled with water (g=10mg-2,density of water =1000kgm-2) 2.a sample of air weighing 1.32*10^2N is confined in a room measuring 9.5m*2.0m.calculate the density of the ...
Thursday, February 23, 2017 by ogu

physics
What is the density of a fuel of relative density 0.72
Thursday, February 23, 2017 by ogu

physics
The index of refraction of water for a given monochromatic light in water is n=4/3. The wavelength of this light in water is 500nm. a) find the speed of this light in water. b) find the energy of one photon of this light . Does this enerdy change if this light is propagated in...
Thursday, February 23, 2017 by vicky

physics
A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C
Thursday, February 23, 2017 by momen

Physics
Two forces are applied to a block of mass MM=12.0 kg that sits on a horizontal, frictionless table. One force F⃗ 1F→1 has a magnitude of 10.0 N and is directed at an angle θ1 equal to 37.0° from the xx direction as labeled in the figure below. As a result of the forces, ...
Thursday, February 23, 2017 by Neam

Physics
A box (mass=34kg) is set on an incline (angle=36.5 degrees), attached to a string. The box is let go slowly with a tension of 205N on the string, and starts sliding down with an acceleration of 0.12m/s^2. What was the coefficient of kinetic friction between the box and the ...
Thursday, February 23, 2017 by Stephanie

Physics Word Problem
suppose a meteorite called head on with mars and becomes buried under mars surface. what would be the elasticity of this collision? explain your answer.
Wednesday, February 22, 2017 by Anthony

physics
the human body can survive a negative acceleration trauma incident if the magnitude of the acceleration is 250m/sq. s. If you are in an automobile accident with an initial velocity of 29.17 m/s and are stopped by an airbag that inflates from the dashboard, over what distance ...
Wednesday, February 22, 2017 by judel

Physics
Sputnik, the first artificial satellite to orbit the Earth, had a mass of 83.6kg and travelled at 7574 m/s. The radius of the earth is 6371 km and its mass is 5.972 x 10^24 kg. What gravitational force did Sputnik apply to the earth during this orbit? What I've got so far: so...
Wednesday, February 22, 2017 by Grace

physics
The pitcher throws a pitch from the mound toward home plate 18.4m away. The ball is released horizontally from a height of 1.8m with a velocity of 32m/s. Find the height above ground when it gets there.
Wednesday, February 22, 2017 by charlee

physics
A large box of mass M is pulled across a horizontal, frictionless surface by a horizontal rope with tension T. A small box of mass m sits on top of the large box. The coefficients of static and kinetic friction between the two boxes are μs and μk, respectively. Find an ...
Wednesday, February 22, 2017 by jjh

Physics
write an equation that relates to frequency(f) applied to the string to the length(L) between the two fixed end points. This was from lab of standing waves.
Wednesday, February 22, 2017 by kailey

Physics
Davi Kent caldoza is riding the Giant Drop at great America. If Davi Kent free falls for 3.6 seconds, what will be his final velocity and how far will he fall?
Wednesday, February 22, 2017 by Angelo

Physics
A stone is thrown vertically upward with the velocity of 49.0 m/s. (a) how high will it travel before it starts to fall? (b) how many seconds will it take the stone to reach the highest point?
Wednesday, February 22, 2017 by Angelo

Physics
A Ball of Mass 0.5kg Moving At 10m/s Collide With Another Ball Of Equal mass At Rest.If The Two Balls Move Together After The Impact Calculate Their common Velocity
Wednesday, February 22, 2017 by Physics

physics
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = -5.5 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the ...
Tuesday, February 21, 2017 by Sam

Physics
A wet bar of soap slides freely down a ramp 17.0 m long, inclined at 38.0 degrees. How long (in seconds) does it take to reach the bottom? (Neglect friction.)
Tuesday, February 21, 2017 by Joseph

Physics
An electric heater the temperature of 120g of water in a thin light vessel through 10k in 2 minutes, when placed in 70g of water contained in a metal vessel of mass 0.55kg the temperature rises through 9k in the same time. Calculate from the above The heat supplied in 2 ...
Tuesday, February 21, 2017 by Anne

physics
Starting from rest, a student pulls a (34) kg box a distance of (13.50) m across the floor using a (161) N force applied at 35.0 degrees above horizontal. The coefficient of kinetic friction is 0.220 between the floor and the box. Find the work done by the pulling force. Give ...
Tuesday, February 21, 2017 by l

physics
A 22.0 kg box is sliding down on an incline set at (44) degrees up from horizontal. The coefficient of kinetic friction between the box and the incline is (.27). Find the acceleration of the box. Give your answer in m/s2 and with 3 significant figures.
Tuesday, February 21, 2017 by l

Physics
A cubic block initially at rest slides with a constant acceleration on an inclined plane 10m long in 2s. Calculate the acceleration of the block.
Tuesday, February 21, 2017 by Diana

physics
A flying-saucer shaped fairground ride is rotating in a horizontal plane. If the rider’s circular path has a radius of 8 m, at how many revolutions per minute the ride should spin in order for the rider to feel a centripetal acceleration of about 1.5 times Earth’s ...
Tuesday, February 21, 2017 by yara

physics
A 10kg box is attached to a 7kg box which rests on a 30 degrees incline the coeficient of kinetic friction is mk=0.1 between the box and surface find the rate of acceleration of the system
Tuesday, February 21, 2017 by hellen

physics
A ‘moving sidewalk’ in an airport terminal moves at 1 m/s and is 35 m long. If a woman steps on at one end and walks 1.5 m/s relative to the sidewalk, in the same direction as the movement of sidewalk. (a) How much time does it take her to reach the opposite end? 14s (b) ...
Tuesday, February 21, 2017 by yara

Physics
When a mass is hung from a spring stretches it by 15 cm. What is the period of the oscillations of this system?
Tuesday, February 21, 2017 by Jack

Physics
an object weighing 200 lbs. and suspended by a rope A is pulled asisde by the horizontal rope B and held so that rope A makes an angle of 30 degree with the vertical. find the tensions in rope A and B.
Tuesday, February 21, 2017 by Joseph echano

Physics
The electric field from an infinitely large and uniformly charged sheet is independent of the distance from the sheet, yet the individual charges in the sheet all produce fields that object the inverse square law. Why doesn't the field get weaker at greater distances?
Monday, February 20, 2017 by Timothy

physics
A car travelling at 25 m/s slams its break leaving skids marks along a distance 125 m as it comes to rest. the coefficient f friction between the tire and the road is a 5 b 2.5 c 1 2 .4 e .25 A 500N worker pulling a 500 N crate on a rope with a force of 50 N at a constant ...
Monday, February 20, 2017 by Anthony

Physics
which of the following is NOT true about the path of a cannon ball launched horizontally from the earth's surface if air resistance is neglected? a. the cannnonball has a uniform horizontal velocity b.the total velocity of the cannon ball increases as a function of time c.the ...
Monday, February 20, 2017 by Anonymous

physics
An electron in a cathode-ray tube is traveling horizontally at 2.10×109 cm/s when deflection plates give it an upward acceleration of 5.40×1017 cm/s2 . How long does it take for the electron to cover a horizontal distance of 6.30 cm ?What is its vertical displacement during ...
Monday, February 20, 2017 by sintia

physics
What is the magnitude of your total displacement if you have traveled due west with a speed of 23 m/s for 125 s , then due south at 12 m/s for 255 s ? 2sf What is the direction of your total displacement in part A.
Monday, February 20, 2017 by sintia

physics
In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 17 m/s at an angle of 39 ∘ above the horizontal. How long does it take for the ball to reach the wall if it is 3.8 m away? How high is the ball when it ...
Monday, February 20, 2017 by ana

Physics
What happens to the location of the image when the radius of curvature changes? I think it moves farther away when the curvature increases.
Monday, February 20, 2017 by Anonymous

physics
A soccer ball is kicked with a speed of 16.7 m/s at an angle of 45.0 ∘ above the horizontal.If the ball lands at the same level from which it was kicked, for what amount of time was it in the air?
Monday, February 20, 2017 by ana

physics
IP A white-crowned sparrow flying horizontally with a speed of 1.70 m/s folds its wings and begins to drop in free fall How far does the sparrow fall after traveling a horizontal distance of 0.400 m
Monday, February 20, 2017 by sintia

physics
An electron in a cathode-ray tube is traveling horizontally at 2.10×109 cm/s when deflection plates give it an upward acceleration of 5.40×1017 cm/s2 .How long does it take for the electron to cover a horizontal distance of 6.30 cm ? What is its vertical displacement during ...
Monday, February 20, 2017 by sintia

physics
The Earth is 150 million km from the sun. It completes one orbit in a period of approximately 365.25 days. Calculate the orbital speed of Earth in km/hour. please helpppp
Monday, February 20, 2017 by loral

Physics
A 71 kg skydiver jumps out of a plane at an altitude of 1370m. She reaches terminal velocity of 68m/s. She opens the parachute at an altitude of 328m, and lands with a speed of 2.8m/s. a)How much (negative) work is done by air resistance before she opens the chute? b)How much ...
Monday, February 20, 2017 by Helen

Physics
A stone is dropped from a hot air balloon that is rising at a constant speed of 2.2 m/s. If the stone takes 4.8 seconds to reach the ground then … a) What was the height of the balloon at the moment the stone was released? b) What is the height of the balloon at the time the...
Monday, February 20, 2017 by Jimbo

Thermal physics
Explain thermal physics in details
Monday, February 20, 2017 by Lukonde margret

Physics
A 50 ohm resistor consists of a copper portion joined to carbon portion, the resistance of the resistor being the sum of the resistance for 2 portions. Find the resistance of the copper portion of the resistor so that the combined resistance will be constant at all temperature.
Sunday, February 19, 2017 by Mycah

physics
Last one! Thankyou for the help thus far... calculate the KE in kJ of 9.100 x 10^5 atoms of silver moving at 1800. km/hr. ... the atoms part is what I'm confused about.
Sunday, February 19, 2017 by Sarah

physics
I'm not sure with this conversion... getting 9.843x10^4 ft/min to m/s ? How do I get to m/s using a specification conversion without using online conversions?
Sunday, February 19, 2017 by Sarah

physics
A 2000kg car is slowed down uniformly from 20m/s to 5 m/s in 4s. What is the average total force on the car during this time.
Sunday, February 19, 2017 by Pau

Physics
calculate K.E in Joules of a baseball w/ a mass of 237.2 cg moving at 85.00 mph
Sunday, February 19, 2017 by Sarah

physics
how is energy conserved ith a spring and box on a ramp. does 1/2kx^2 still equal gpe? what if the spring displacement is the same but the angle of the ramp changes, causing the gpe to change. how is energy conserved since the gpe is lower than before but the spring pe is the ...
Sunday, February 19, 2017 by Anonymous

addition vectors (physics)
75 km at 25° north of east, then 75 km at 65° south of west, and then 75 km due south
Sunday, February 19, 2017 by Sotha

Physics
17 km due north, then at 7° south of east, and then 15 km at west of south
Sunday, February 19, 2017 by Sotha

Physics
When dots are placed on a page from a laser printer, they must be close enough so that you do not see the individual dots of ink. To do this, the separation of the dots must be less than Raleigh’s criterion. Take the pupil of the eye to be 2.9 mm and the distance from the ...
Sunday, February 19, 2017 by Megan

Physics
The dipole moment of a water molecule is 6.37E-30 Cm. What is the electric potential's magnitude 1.58 nm from a water molecule along the axis of the dipole?
Sunday, February 19, 2017 by Sarah

Physics
2300 Joules is used to lift a wheelbarrow through 4 meters up an inclined plane into a container. Why does the man use more joules (3500 J) to push the wheelbarrow?
Sunday, February 19, 2017 by Tia

Physics
2300 Joules is used to lift a wheelbarrow through 4 meters up an inclined plane into a container. Why does the man use more joules (3500 J) to push the wheelbarrow?
Sunday, February 19, 2017 by Kale

Physics
A pilot wants to bomb his target on the ground. If the angle of the plane from the horizontal is 20° and the velocity of the plane is 80 m/s , find A). The distance that the pilot must release the bomb to his target B) the time before the bomb hits the target C) the final ...
Saturday, February 18, 2017 by Harrieth

PHYSICS
What is the relationship between angle and gpe with a cart and a ramp. Also if it isn't linear find away to graph it in a linear fashion.
Saturday, February 18, 2017 by Anthony

Laws of Physics
A block and tackle has a velocity of 6 and it is being used to raise a mass of 68 newtons through 3 meters. The efficiency is 60% Calculate the amount of energy needed to lift the mass through 3 meters and calculate the amount of energy that was put into the system and the ...
Saturday, February 18, 2017 by Laura

physics
A 145-lb student races up stairs with a vertical height of 4.8 m in 5.5 s to get to a class on the second floor. How much power in watts does the student expend in doing work against gravity
Saturday, February 18, 2017 by Jeorge Gonzlies

physics
If a 0.50-kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 7.6 N for a distance of 8.6 m, then what would be the block's velocity
Saturday, February 18, 2017 by Jeorge Gonzlies

physics
The motion of the truck is described by the equation V = 50t – 5t^2.Find: a.Value from t = 1.5 s to t = 5.0 s. b.Vinst at t = 3.0 s.
Saturday, February 18, 2017 by mohammed

physics
What is the effect of increasing the inclination of the track to the acceleration of the rider in the experiment?
Saturday, February 18, 2017 by mohammed

physics
Is the motion of the rider for each angle of inclination uniformly accelerated? Why or why not?
Saturday, February 18, 2017 by mohammed

physics
describe the shape of the graph made and discuss its significance.
Saturday, February 18, 2017 by mohammed

physics
From the graph made, compute for the instantaneous acceleration of the rider for each inclination at any chosen time by computing for the slop of the tangent line?
Saturday, February 18, 2017 by mohammed

physics
a bird can fly in still air at 20 miles per hour. when the wind is blowing straight from the north at 10 miles/hr. in what direction must the bird aim in order that it may fly from east to west and at what speed will it have?
Friday, February 17, 2017 by ravi ranjan

Physics
How much does it cost to operate a 23-W porch light for 24 h if electric energy costs 8¢/kWh?
Friday, February 17, 2017 by Mary

Physics
Hi, the following is a problem that concerns angular momentum: Modern hard drives spin very fast! The part that holds the data is a disk called the platter. Assume an aluminum platter that is 3.5in. in diameter, 1mm thick, and spinning at 5400 rpm. Treat the platter as a solid...
Friday, February 17, 2017 by Grace

Physics 202-help
If we have just counted 15 seconds between the lightning and thunder, how far away do we predict the center of the thunderstorm to be using the 3 second rule and What was the percent difference between the prediction and the real distance of the thunderstorm? The speed of ...
Friday, February 17, 2017 by mariah

physics
A proton travels to the east at 3.5*10⁶ m/s as it enters a region of uniform magnetic field. The magnitude of the magnetic field is 0.15 T and its direction is 30° north of east. Find the magnitude of the force on the proton at the moment it enters the magnetic field.
Friday, February 17, 2017 by uy

Physics
State the similarities between Coloumb's law And Newton's Law Of Universal Gravitation.
Friday, February 17, 2017 by Jacob

Physics
Question: A 62 kg astronaut floats outside a 3200 kg spacecraft. She's initially stationary with respect to the spacecraft. Then she pushes against the spacecraft and moves away at .50m/s to the left. I got an answer of .0096kg from doing 62*.50/3200 but that is incorrect. ...
Thursday, February 16, 2017 by Kay

Physics
Two ultrasonic sound waves combine and form a beat frequency that is in the range of human hearing for a healthy young person. The frequency of one of the ultrasonic waves is 84 kHz. (The range of hearing for a healthy young person is 20 Hz to 20 kHz.) (a) What is the smallest...
Thursday, February 16, 2017 by Daisy

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