Friday

September 4, 2015
**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*

**physics**

A certain bacterium swims with a constant speed of 4.61 µm/s. How long will it take to swim across a petri dish that has a diameter of 8.69 cm?
*Monday, August 17, 2015 by James*

**physics**

A ball is thrown from the ground level with a x-velocity of 25m/s and a y-velocity of 45m/s. What is the ball velocity at the maximum height of trajectory?
*Monday, August 17, 2015 by jay*

**physics**

A copper Calorimeter of mass 150g,was half-filled with water of mass 300g and a temperature of 0°C.5g of ice of mass 0°C was added to the content, later some quantity of steam was passed into the mixture and the temperature rose by 20°C. Calculate the quantity of ...
*Monday, August 17, 2015 by oluwasegun*

**Physics **

A 1386 kg car traveling at 61 km/h is brought to a stop while skidding 42 m. What is the work done on the car by the frictional forces? (Use formula: v2 = vo2 + 2ad)
*Monday, August 17, 2015 by Jenna*

**physics **

The hook of a spring balance carries an object of mass 5kg And the balance is suspended vertically from the roof of a lift. Find the reading on the spring balance when the lift is going down with an acceleration of 0.1m/s^2? g=10m/s^2
*Monday, August 17, 2015 by jay*

**Physics 2**

If water at 0 oC is heated, it actually decreases in volume until it reaches Select one: a. 1 oC. b. 2 oC. c. 3 oC. d. 4 oC. e. 5 oC.
*Monday, August 17, 2015 by Urgent*

**physics**

a 0.8kg ball is kicked with the speed 20m/s at an 50 to the horizontal.calculate the kinetic energy of the ball at maximum height. m=0.8kg v=20m/s h=?
*Monday, August 17, 2015 by rose*

**physics**

a simple pendulum is suspended from the roots of a carriage if the carriage starts moving with an acceleration a ,then in eqilibrium the pendulum makes an angle theta with the vertical given by
*Monday, August 17, 2015 by Anonymous*

**Physics**

During an all-night cram session, a student heats up a 0.332 liter (0.332 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19.0 °C, and the beaker is filled to the brim. A short time later when the student returns, the temperature has risen ...
*Sunday, August 16, 2015 by Anonymous*

**Physics**

During an all-night cram session, a student heats up a 0.332 liter (0.332 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19.0 °C, and the beaker is filled to the brim. A short time later when the student returns, the temperature has risen to...
*Sunday, August 16, 2015 by Anonymous*

**Physics **

What is the change in velocity (in m/s) if an impulse of 225 N acts on a 4.5 kg mass for 3.0 s?
*Sunday, August 16, 2015 by Jenna*

**Physics**

A force of 12.0 N acts for 3.7 s on mass M. What impulse (in N*s) is given to the mass?
*Sunday, August 16, 2015 by Jenna*

**Physics **

A cyclist travels a distance of 1200m due north before going 2000m due east followed by 500m south-west. Draw a scale diagram to calculate the cyclist's final displacement form her initial position?
*Sunday, August 16, 2015 by Jorge *

**Physics**

A 50.0 g bullet strikes a 7.00 kg stationary wooden block. If the bullet becomes embedded in the block, and the block with the embedded bullet moves off at a velocity of 5.00 m/s, what was the initial velocity of the bullet?
*Sunday, August 16, 2015 by Jenna*

**physics**

A 0.40kg object is attached to a spring constant 160N/m so that the object is allowed to move on a horizontal frictionless surface. The object is released from rest when the sprin g is compressed 0.15m find: a) the force on the object and b) its acceleration at this instant.
*Sunday, August 16, 2015 by Etah*

**Physics**

A newly discovered particle, the SPARTYON, has a mass 895 times that of an electron. If a SPARTYON at rest absorbs an anti-SPARTYON, what is the frequency of each of the emitted photons (in 1020 Hz)? The mass of an electron is 9.11×10-31 kg.
*Sunday, August 16, 2015 by Julie*

**Physics**

Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 8.1 x 1028 kg and 1.7 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this material, how much would...
*Sunday, August 16, 2015 by Anonymous*

**physics**

An aeroplane lands on the runway at velocity 180km/hour and decelerates at 0.4 m/s^2 find the time taken until it stops and the displacement.
*Sunday, August 16, 2015 by toqa*