Saturday
August 29, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
A stone is dropped into a well and the sound of the splash is heard after 3.91 seconds. If the depth of the well is 67.7 meter, find the velocity of sound???
Saturday, August 29, 2015 by Anonymous

Physics
A 60 kg soccer player kicks a stationary 0.4 kg ball giving it a speed of 14 m/s. The player's foot is in contact with the ball for 0.08 second. What is the average force on the ball? P.S What formula/s should I use?
Saturday, August 29, 2015 by Julie

Physics
A 2000 kg starts from rest and gains a velocity of 20 m/s in 5 s. What force wad applied on it?
Saturday, August 29, 2015 by Peter

Physics
A force of 64 N is applied on a body producing an acceleration of 2.4 m/s^2. What is the mass of a body?
Saturday, August 29, 2015 by Liz

Physics
a 75 w compact fluorescent bulb operating at 30% efficiency. Calculate the amount of energy lost to heat and the amount of energy converted into light after the bulb has been on for 2.0h.
Saturday, August 29, 2015 by Jason

physics
At a carnival, you can try to ring a bell by striking a target with a 8.46-kg hammer. In response, a 0.411-kg metal piece is sent upward toward the bell, which is 5.22 m above. Suppose that 34.4 percent of the hammer's kinetic energy is used to do the work of sending the ...
Saturday, August 29, 2015 by kate

physics
A pistol of mass 2kg fires a bullet of mass 50g. The bullet strikes a block of mass 0.5kg. If the block with bullet embedded in it moves with a velocity of 4m/s the recoil velocity of the gun will be..??
Friday, August 28, 2015 by yash

physics
Starting from rest, a 2.4x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.42 N on it. This force does 1.5x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground...
Friday, August 28, 2015 by archer

physics
A 58.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 3.70 m. What is the work done on the man by (a) the gravitational force and (b) the escalator?
Friday, August 28, 2015 by archer

physics
The aorta carries blood away from the heart at a speed of about 43 cm/s and has a radius of approximately 1.1 cm. The aorta branches eventually into a large number of tiny capillaries that distribute the blood to the various body organs. In a capillary, the blood speed is ...
Friday, August 28, 2015 by archer

physics
If a scuba diver descends too quickly into the sea, the internal pressure on each eardrum remains at atmospheric pressure while the external pressure increases due to the increased water depth. At sufficient depths, the difference between the external and internal pressures ...
Friday, August 28, 2015 by kate

physics
The human lungs can function satisfactorily up to a limit where the pressure difference between the outside and inside of the lungs is 1/21 of an atmosphere. If a diver uses a snorkel for breathing, how far below the water can she swim? Assume the diver is in salt water whose ...
Friday, August 28, 2015 by kate

physics
The drawing shows an intravenous feeding. With the distance shown, nutrient solution (ñ = 1040 kg/m3) can just barely enter the blood in the vein. What is the gauge pressure of the venous blood? Express your answer in millimeters of mercury.
Friday, August 28, 2015 by kate

physics
An archer, about to shoot an arrow, is applying a force of +250 N to a drawn bow string. The bow behaves like an ideal spring whose spring constant is 510 N/m. What is the displacement of the bow string?
Friday, August 28, 2015 by kate

physics
You are trying to lose weight by working out on a rowing machine. Each time you pull the rowing bar (which simulates the "oars") toward you, it moves a distance of 1.17 m in a time of 1.84 s. The readout on the display indicates that the average power you are ...
Friday, August 28, 2015 by kate

Physics
An airplane has a takeoff speed of 66m/s. Assuming a constant acceleration of 1.62m/s^2, how long is the plane accelerating down the runway?
Friday, August 28, 2015 by Marty

PHYSICS
The x and y components of a vector A are 4 and -5 respectively and Vector B are -2 and 1 respectively. If A-B+3C=0, find the Cartesian coordinates for vector C?
Friday, August 28, 2015 by BARNABAS

Physics
a speed boat is moving though the water at a speed of 28 m/s when the engine stalls. the boat comes to a halt over 120m, what is the time it takes to stop and what is the acceleration. im trying to figure it out but i dont know what kinematic equation to use
Thursday, August 27, 2015 by Neil

Physics
The height of a cylindrical container is 15 cm and the inside diameter of the container is 10 cm. a) what is the volume? b) How much weight (in kg) would be required to fill the container to a density of 1.3 g/cm^3?
Thursday, August 27, 2015 by James

Physics
A voltmeter is specified as being accurate to within 2%. The reading on the voltmeter is 3.50v..the maximum voltage represented by this reading is?
Thursday, August 27, 2015 by Victor

Physics
At a carnival, you can try to ring a bell by striking a target with a 8.46-kg hammer. In response, a 0.411-kg metal piece is sent upward toward the bell, which is 5.22 m above. Suppose that 34.4 percent of the hammer's kinetic energy is used to do the work of sending the ...
Thursday, August 27, 2015 by Ben

Physics
A skier slides horizontally along the snow for a distance of 12.1 m before coming to rest. The coefficient of kinetic friction between the skier and the snow is 0.0343. Initially, how fast was the skier going?
Thursday, August 27, 2015 by Ben

physics
A bicycl rider starts from rest and moves with uniform acceration of 1.5m\s^2 it is velocity reachs 7.5m\s of a distance .......
Thursday, August 27, 2015 by donia

Physics
Starting from rest, a 2.4x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.42 N on it. This force does 1.5x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground...
Thursday, August 27, 2015 by Kate

Physics
A 58.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 3.70 m. What is the work done on the man by (a) the gravitational force and (b) the escalator?
Thursday, August 27, 2015 by Kate

physics
a ball is thrown horizontally from the top of a building 35m. high. the ball strikes the ground at a point 80m from the base of the building. a. find the time the ball is in flight b. its initial velocity c. the x and y components of velocity just before it hits the ground
Thursday, August 27, 2015 by Anonymous

physics
A speed skater moving across frictionless ice at 9.0 m/s hits a 5.3 m -wide patch of rough ice. She slows steadily, then continues on at 5.8 m/s. What is her acceleration on the rough ice? Express your answer using two significant figures.
Wednesday, August 26, 2015 by hannah

Physics
Scientists hypothesized that finer grain iron oxide on video and audio tapes would result in better recording and playback. They produced ten tapes with a range of partial sizes, recorded them, and tested the quality of the playback. Electronic instruments and human visual and...
Wednesday, August 26, 2015 by Annah

Physics
Consider a cloudless day when the sun shines down across the United States. If 2375 kJ of energy reaches a square meter (m2) of the United States in one hour, how much total solar energy reaches the entire United States per hour? The entire area of the United States is 9,158,...
Wednesday, August 26, 2015 by Ashley

physics(lens)
Two converging lenses, A and B,with focal length F1=20cm and F2=25cm,are placed 80cm apart. An object is placed F0cm in front of the first lens. 1)Determine the position of the final image formed by the magnification of the two lenses. 2)Determine the magnification of the ...
Wednesday, August 26, 2015 by benjamin

physics
Two forces 7N each are inclined at an angle of 120 degree to each other. Find the single force that will replace the given force system
Wednesday, August 26, 2015 by sheryl

physics(measurement)
What accurate method can be used to determine the thickness of a coin. Explain pls..
Wednesday, August 26, 2015 by benjamin

physics(lens)
Two converging lenses, A and B,with focal length F1=20cm and F2=25cm,are placed 80cm apart. An object is placed F0cm in front of the first lens. 1)Determine the position of the final image formed by the magnification of the two lenses. 2)Determine the magnification of the ...
Wednesday, August 26, 2015 by benjamin

physics
10 planks are required to stop the bullet in initial velocity u thickness of each planks is x and all planks are producing equal retardation find the final velocity of bullet after coming out of first plank
Wednesday, August 26, 2015 by deepica

Physics
a ball is thrown vertically upward and reaches a height of 15 cm. Find, a.) The projection velocity b.) the time of flight c.) the speed with w/c the ball passes the starting point
Wednesday, August 26, 2015 by Justine

physics
What is basically difference between the following : 1)Internal energy and latent heat 2)Internal energy and potential energy I'm really confused , because they're so close in meaning. Thanks
Wednesday, August 26, 2015 by MAD

physics
A piece of ice its mass is 2.5 kg and at 0.0 C temperature , it is crawling on the ground with 5.7 m/s , what is the mass of the melted ice , if we know all of the kinetic energy of the ice turn into the internal energy (of the ice ) , that we need 3.3 X 10^5 J to melt 1.0 kg ...
Wednesday, August 26, 2015 by MAD

physics
A person hammered a 0.5 kg something (substance ) with a hammer that its weight is 2.5 kg , with the velocity 65 m /s ,, if one third of the hammer's energy turn into the internal energy to both of the substance and the hammer , then what is the change (increasing ) ...
Wednesday, August 26, 2015 by MAD

physics
In physics what are the dependent variables between 0 and 2 on a line graph? I must use the rounded number to mark off intervals along the axis. The intervals must be the same amount each time (count up by the same number).
Wednesday, August 26, 2015 by clint

College Physics
A cyclist is at rest at a traffic light. When the light turns green, he begins accelerating at 2.56 m/s2. How far does he go after the light turns green until he reaches a cruising speed of 10.88 m/s?
Tuesday, August 25, 2015 by Ashley

Physics
A car starts from rest and travels for 5.0 s with a steady acceleration of magnitude 1.5 m/s2. the driver then applies the brakes for 3.0 seconds causing a steady deceleration of magnitude 2.0 m/s2. How fast is the car going at the end of the breaking period?
Tuesday, August 25, 2015 by Heather

physics
a bullet of mass 0.1kg moving with velocity 500 m/s strikes with a block of mass 2kg suspended with a string.after collision block is raised by 0.1m. what will be the velocity of bullet after the collision. bullet is not embeded in the block.
Tuesday, August 25, 2015 by dharmender duddi

Physics
The makers of a certain automobile advertise that it will accelerate from 15 to 50 mi/hr in high in 13 sec. Compute (a) the acceleration in ft/ sec2, and (b) the distance the car travels in this time, assuming the acceleration to be constant.
Tuesday, August 25, 2015 by Justine

Physics
A falling body has an initial velocity of 200 cm/sec. How far will it drop before it's velocity becomes 10,000 cm/sec.
Tuesday, August 25, 2015 by Justine

physics
The magnetic potential in the region in the given X v=2xy. find magnetic field at (1m, 1m)
Tuesday, August 25, 2015 by himanshu singh

physics
Is initial velocity can be negative? in this case, A stone is dropped from a ballon while ascending at the rate of 8mps. The stone reaches the ground in 6 sec. What is the height of the balloon when the stone was dropped? What is the sign for the initial velocity? Can someone ...
Tuesday, August 25, 2015 by karylle

Physics
When the shuttle bus comes to a sudden stop to avoid hitting a dog, it decelerates uniformly at 3.6 m/s^2 as it slows from 8.5 m/s to 0 m/s. Find the time interval of acceleration for the bus. Answer in units of s.
Tuesday, August 25, 2015 by Anonymous

Physics
A car travels in a straight line for 2.9 h at a constant speed of 77 km/h . What is its acceleration? Answer in units of m/s^2
Tuesday, August 25, 2015 by Anonymous

Physics
You throw a glob of putty straight up toward the ceiling. Which is 3.60 m above the point where the putty leaves your hand. The initial speed of the putty leaves  as it leaves your hand is 9.50m/s.<br> (A) what is the speed of the putty just before it strikes the ...
Monday, August 24, 2015 by Dave Ang

Physics
19. A track consists of a frictionless incline plane, which is a height of 0.5 m, and a rough horizontal section with a coefficient of kinetic friction 0.02. Block A, whose mass is1.5 kg, is released from the top of the incline plane, slides down and collides instantaneously ...
Monday, August 24, 2015 by Alex

Physics
The speed of a train increased from 20 mi/hr to 30 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2
Monday, August 24, 2015 by Dave Ang

difficult physics i need help
calculate the relative permeability of an iron ring when the exiting current taken by the 600-turns of coils is 1.2A and the total flux produce is 1mwb.the mean circumference of the rings is 50m and the area of the cross section is 10cm^2?...
Monday, August 24, 2015 by edward

Physics
A speeding motorists passes a stopped police car. At the moment he passes, the police car begins accelerating at a constant rate of 4.4 m/s^2. The motorist unaware that he is being chased, continues at a constant speed until the police car catches him 12s later. How fast was ...
Sunday, August 23, 2015 by Bob

physics
A stone is thrown straight up from the ground with an initial speed of 26.6 m/s. At the same instant, a stone is dropped from a height of "h" (a variable) meters above ground level. The two stones strike the ground simultaneously. Find the height "h" (a ...
Sunday, August 23, 2015 by Nate

Physics
A ball is launched up an inclined wall by a spring. The spring has a spring constant of 12.2 kN/m and is initially compressed 0.3m. The ball has a mass of 1.7 kg, a radius of 0.045m, and a moment of inertia of 0.0014kg*m^2. You can assume the ball rolls along the surface ...
Sunday, August 23, 2015 by Howard

Physics
A conventinal light bulb is rated at 240 V (100 W).Ligths is emitted when the filament of the bulb gets whites hot.How many joules of energy does bulb transform each minute?
Sunday, August 23, 2015 by Fanih

physics
A car travels at a constant speed of 30 mph for 20 miles, at a speed of 40 fps for the next 20 miles, and then travels the final 20 miles at 90 kph. what is the average speed of the entire trip?
Sunday, August 23, 2015 by michelle

Physics
a block of mass 1500kg lying steady on horizontal surface of a table needs 200N horizontal force to come in motion. What is coefficient of static friction between the block and the surface of table
Sunday, August 23, 2015 by Janmesh patel

Physics
At an instant the block(M = 33kg) is moving down the slope. Angle between slope and floor = 33deg Force Pulling up the slope 49N at 38deg to the slope What is the acceleration of the block up the slope if the kinetic coefficient of friction is 0.5? My first thought was that ...
Saturday, August 22, 2015 by Jonathan

Physics
A clown at a birthday party has brought along a helium cylinder, with which he intends to fill balloons. When full, each balloon contains 0.00280 m3 of helium at an absolute pressure of 1.20 x 105 Pa. The cylinder contains helium at an absolute pressure of 2.90 x 107 Pa and ...
Saturday, August 22, 2015 by Anonymous

physics
A cyclist is at rest at a traffic light. When the light turns green, he begins accelerating at 2.13 m/s2. How many seconds after the light turns green does he reach a cruising speed of 5.05 m/s?
Saturday, August 22, 2015 by Kevin

Physics
A stone is dropped from a ballon while ascending at the rate of 8mps. The stone reaches the ground in 6 sec. What is the height of the balloon when the stone was dropped?
Saturday, August 22, 2015 by Karylle

Physics
a block of mass 1500kg lying steady on horizontal surface of a table needs 200N horizontal force to come in motion. What is coefficient of static friction between the block and the surface of table
Saturday, August 22, 2015 by Janmesh patel

Physics
In a house the temperature at the surface of a window is 22.3 °C. The temperature outside at the window surface is 2.82 °C. Heat is lost through the window via conduction, and the heat lost per second has a certain value. The temperature outside begins to fall, while ...
Saturday, August 22, 2015 by Anonymous

physics
two small kids weighing 10kg and 15kg are trying to balance on a seesaw of total length 5 m with the fulcrum at the centre. if one of the kids is sitting at an end where should the other sit?
Saturday, August 22, 2015 by anonymous

Physics.
A glacier advances at 3.9x 10 -6 cm/s. How far will it move in 50000s? How far will it move in 3.3y? Answer in units of cm.
Friday, August 21, 2015 by Diana

Physics
The Kelvin temperature of an object is T1 and the object radiates a certain amount of energy per second. The Kelvin temperature of the object is then increased to T2, and the object radiates 81 times as much energy per second as it radiated at the lower temperature. What is ...
Friday, August 21, 2015 by Anonymous

physics
A car travels along a straight stretch of road. It proceeds for 11.2 mi at 52 mi/h, then 23.2 mi at 40 mi/h, and finally 48.2 mi at 31.9 mi/h. What is the car’s average velocity during the entire trip?
Friday, August 21, 2015 by shriya

Physics
A man can swim in still water at a speed of 3km/hr.He wants to cross the river that flows at 2km/hr and reach the point directly opposite to his starting Point.find the angle if his body makes with the river flow.
Friday, August 21, 2015 by Anonymous

Physics
A body is projected at angle of 30 degree with the horizontal at an initial speed of 200m/s.how far from the point of projection will it strike
Friday, August 21, 2015 by Bright

physics
a car moving at 6m/s accelerate at 1.5meter squared per second for 4seconds.It then it slows down at rate 1.2 meter squared per second. What is the distance travel?
Friday, August 21, 2015 by melanie

physics
2 forces pull horizontally on a heavy box. force b is directed 20 west of north and pulls twice as hard as force a. the resultant of these two pulls is 400N directly northward. using vector components to show two possible solutions to this problem: a. what are the two possible...
Friday, August 21, 2015 by courtney

Physics
The stoplights on a street are designed to keep traffic moving at 34 mi/h. The average length of a street block between traffic lights is about 80 m. What must be the time delay between green lights on successive blocks to keep the traffic moving continuously? There are 1.609...
Thursday, August 20, 2015 by Joe

Physics
On a drive from your home to town, you wish to average 44 mph. The distance from your home to town is 106 miles. However, at 53 miles (half way), you find you have averaged only 33 mph. What average speed must you maintain in the remaining distance in order to have an overall ...
Thursday, August 20, 2015 by Joe

Physics
Part one was answered, thank you. This was Part one:A runner is jogging at a steady 6.2 km/hr. When the runner is 4.9 km from the finish line, a bird begins flying from the runner to the finish line at 24.8 km/hr (4 times as fast as the runner). When the bird...
Thursday, August 20, 2015 by Joseph

Physics
The stoplights on a street are designed to keep traffic moving at 34 mi/h. The average length of a street block between traffic lights is about 80 m. What must be the time delay between green lights on successive blocks to keep the traffic moving continuously? ...
Thursday, August 20, 2015 by Elsa

Physics
After this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. The bird repeats the back and forth trips until the runner reaches the finish line. How far ...
Thursday, August 20, 2015 by Val

Physics-PLEASE HELP
A man walks for 5 km/hr for 1 km and 7 km/hr for next 1 km. What is his average speed for the walk of 2 km? -5.8 km/hr -6.0 km/hr -2.0 km/hr -1.0 km/hr Thank you very much!!
Thursday, August 20, 2015 by Ellie

physics
One of the standard tracks used in athletic events is a 400m loop. This track consists of two straight sections joined by semi-circular sections and one lap of the track in the inside lane is exactly 400 m. (a) What is the displacement of a runner in the inside lane when they...
Thursday, August 20, 2015 by prakash

PHYSICS
a metre rule of length AB and mass 100g is suspended on a knife egde. if a mass of 200g is placed at 25cm mark from A at what point will another mass x be suspended from B?
Thursday, August 20, 2015 by MATEH

Physics
An object moves a to b, 4kms due west and then moves from b to c, 3kms due north. Find the displacement
Thursday, August 20, 2015 by JR

Physics
A runner is jogging at a steady 6.2 km/hr. When the runner is 4.9 km from the finish line, a bird begins flying from the runner to the finish line at 24.8 km/hr (4 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the ...
Thursday, August 20, 2015 by Joseph

Physics
5. A skier wearing a fully-body ski suit of surface area 1.8 m2 is losing heat by convective and radiation processes off the surface of the ski suit at a rate of 95 W. Given that the suit is filled with goose down 15 mm thick with a thermal conductivity of 0.025 Wm−1K&#...
Wednesday, August 19, 2015 by Anonymous

Physics
A concert hall of volume 2000 m3 contains air at a temperature of 25 ◦C and relative humidity 80 %. Given that the density of water vapour in saturated air at 25 ◦C is 22.8 g/m3 and that the temperature and pressure of the concert hall remain constant what mass of...
Wednesday, August 19, 2015 by Anonymous

G ss jikowyi subject physics
Subject physics a spring 20m long is streched to 25cm by a load of 50n ? What will be his length when strench to 100n assuming that the elastic limit is not reached
Wednesday, August 19, 2015 by Mercy

physics
A wooden box is being pulled 10m from its original position along a horizontal surface by constant force of 25N calculate the work done on the box if the force is applied horizontally, and the force makes an angle of 37°.
Wednesday, August 19, 2015 by ann

physics 2
A circus performer stretches a tigthrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.800 s to reach the opposite tower, 20.0 m away. If a 1.00 m length of the rope has a mass of 0.350 kg...
Wednesday, August 19, 2015 by apple

physics
a projectile is fired at 30 degree above the horizontal with an initial speed of 600 m/s. find the direction and magnitude of the velocity after 2 seconds?
Wednesday, August 19, 2015 by don-don

Physics
A bird watcher meanders through the woods, walking 1.07 km due east, 0.533 km due south, and 4.62 km in a direction 50.1 ° north of west. The time required for this trip is 1.451 h. Determine the magnitudes of the bird watcher's (a) displacement and (b) average velocity.
Wednesday, August 19, 2015 by Anonymous

Physics
are water waves at the beach with a velocity of 1.75m/s and a wavelength of 3.213 and frequency of 1/1.84Hz considered fast?
Wednesday, August 19, 2015 by Courtney

physics
A boy runs 10.3 blocks North, 6.1 blocks Northeast, and 5 blocks West. Determine the length of the displacement vector that goes from the starting point to his final position. Determine the direction of the displacement vector. Use counterclockwise as the positive angular ...
Tuesday, August 18, 2015 by Anonymous

physics
Two workers pull horizontally on a heavy box, but one pulls twice as hard as the other. The larger pull is directed at 25.0 degrees west of north, and the resultant of these two pulls is 350.0 N directly northward. Use vector components to find the magnitude of each of these ...
Tuesday, August 18, 2015 by Anne

physics
The magnitude of the velocity of a projectile when it is at its maximum height above ground level is 15 m/s. (a) What is the magnitude of the velocity of the projectile 1.2 s before it achieves its maximum height? (b) What is the magnitude of the velocity of the projectile 1.2...
Tuesday, August 18, 2015 by gar

Physics
How Much Work Is Done Against Gravity In Sliding A 500g Object Through 2m Up A Smooth Plane That Is Inclined 30degree To The Horizontal(g=9.8)
Tuesday, August 18, 2015 by Anonymous

Physics
what is the schwarzschild radius of a black hole with a mass of 1.68x10^43kg
Tuesday, August 18, 2015 by Zack

physics
The length of spring is alpha when force of 4 N is applied on it. The length is beta when force of 5 N is applied then the length of spring when 9 N force is applied is ?
Tuesday, August 18, 2015 by Muqadas

Physics PLEASE HELP!
A bullet whose mass is 1.0 x 10-3 kg leaves a 5.0 kg rifle with a muzzle velocity of 1.0 x 103 m/s. It strikes a stationary block of wood whose mass is 1.0 kg and remains embedded in it. The kinetic energy of the bullet as it travels towards the wooden block is?
Monday, August 17, 2015 by Jenna

physics
An airplane passenger has 150 ml of air in his stomach just before the plane takes off from a sea level airport where the pressure is 1 atm. What volume will this air have at a cruising altitude where the pressure in the man’s stomach has equalized with the cabin pressure...
Monday, August 17, 2015 by anonymous

PHYSICS
A hypothetical planet has a mass 1.49 times that of Earth, but the same radius. What is g near its surface?
Monday, August 17, 2015 by Anonymous

physics
A runner is jogging at a steady 4.8 km/hr. When the runner is 6.3 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (3 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the runner...
Monday, August 17, 2015 by I dont like physics

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