Thursday

May 26, 2016
**physics**

an arrow shot vertically upwards loses its intial speed by 60% in 3 secs maximum height reched by the arrow is (g=9.8 m/sec^2)
*Tuesday, November 24, 2015 by d.nikhileswar reddy*

**Physics**

A watch battery can supply approximately 15 C of charge before it needs to be replaced. Calculate the number of hours it will last if the current drawn by the watch is 0.50 micro-amps
*Tuesday, November 24, 2015 by Joe*

**physics**

Note: The direction of the acceleration ~a of the system is given in the figure. Three masses (17 kg, 21 kg and 67 kg) are connected by strings. The 67 kg mass slides on a horizontal surface of a table top and the 17 kg and 21 kg masses hang over the edge of the surface. The ...
*Tuesday, November 24, 2015 by I dont like physics*

**physics**

Consider a block on an incline plane. The coefficients of static and kinetic friction between the block and the incline are µs = 0.353 and µk = 0.31. Calculate the critical angle θc, where the block just begins to slide. Answer in units of ◦. The block ...
*Tuesday, November 24, 2015 by I dont like physics*

**English 1**

Can someone please check these. I answered what I thought was right; therefore, I did not know three of them which are 16, 17, and 19. 6. Compare and contrast the poem “Mexicans Begin Jogging” and the story “Delfino II: Diez in the Desert.” a. Both are ...
*Tuesday, November 24, 2015 by Blair*

**Physics**

An electrical motor has a power rating of 500 W when it is lifting a mass of 80 kg through a height of 6 m in a time of 15 s. Calculate the efficiency of the motor?
*Tuesday, November 24, 2015 by Joe*

**MacArthur physics **

. A person kicks a rock off a cliff horizontally with a speed of 20 m/s. It takes 7.0 seconds to hit the ground, find: a) height of the cliff b) final vertical velocity c) range
*Tuesday, November 24, 2015 by Anonymous *

**Physics**

A baseball player hits a pop fly that goes directly up in the air with an initial velocity of 45 m/s. What is the maximum height the base ball reaches? Work: initial velocity = 45 m/s, gravity= -9.8 m/s, final velocity = 0 m/s
*Tuesday, November 24, 2015 by Natascha *

**physics **

Two blocks of masses m1=5 and m2=6 kg are on either side of the wedge shown below. Assume the surface and the pulley are frictionless. Find A)the direction this system will accelerate B) the acceleration of m1 and m2 C) the tension in the rope did I do this right? how do I ...
*Tuesday, November 24, 2015 by Spice*

**physics **

Two blocks of masses m1=5 and m2=6 kg are on either side of the wedge shown below. Assume the surface and the pulley are frictionless. Find A)the direction this system will accelerate B) the acceleration of m1 and m2 C) the tension in the rope did I do this right? how do I ...
*Tuesday, November 24, 2015 by Spice*

**physics **

a child sits on the edge of a spinning merry-go-round 3.2 m from its center. The coefficient of static friction between the child's bottom and the surface of the merry-go-round is .8. Find the maximum rate in revolutions per seconds, that the merry-go-round can be spun ...
*Tuesday, November 24, 2015 by Spice*

**Physics**

A car, moving along a straight stretch of high- way, begins to accelerate at 0.0377 m/s2. It takes the car 34.3 s to cover 1 km. How fast was the car going when it first began to accelerate? Answer in units of m/s.
*Monday, November 23, 2015 by kate*

**physics**

Your car is stuck in a mud hole. You are alone but you have a long strong rope. having studied physics you tie the rope tautly to a telephone pole and pull on it sideways at the midpoint as shown. Find the force exerted by the rope on the car when the anle is 3.2 and you are ...
*Monday, November 23, 2015 by zach*

**physics**

The distance between two telephone poles is 31 m. When a 1.54kg bird lands on the telephone wire midway between the poles, the wire sags 0.165 m. The acceleration of gravity is 9.8 m/s^2. How much tension in the wire does the bird produce? Ignore the weight of the wire.
*Monday, November 23, 2015 by zach*

**Physics**

The truck of a passenger car applies brakes at a velocity of 30 m/s and comes to rest 5 seconds later. What is the deceleration?
*Monday, November 23, 2015 by Prince *

**Physics**

how long does it take a car to change its velocity from 15m/s to 25m/s if it accelerates uniformly at 5m/s2.
*Monday, November 23, 2015 by Prince *

**Physics**

In a machine a cylinder with a mass of 80.0 g is pushed down into a hole with a spring at the bottom as shown in Figure 1. When the spring is uncompressed the cylinder rests on top of it with its end just at the entrance to the hole. The cylinder is pushed by a rod which is ...
*Monday, November 23, 2015 by Anonymous*

**Physics**

A very large roller coaster has an initial hill that has an 85 m drop. Note that a roller coaster has no engine. After being pulled up the first hill by a chain the train moves along the track with only gravity, normal forces due to the track, friction and air drag acting on ...
*Monday, November 23, 2015 by Anonymous*

**Physics**

For each of the following situations identify what energy transformation is taking place. (a) A child jumps out of a tree and lands on a trampoline. Consider “initial” to be the moment when they have left the tree and “final” to be the moment when they are...
*Monday, November 23, 2015 by Anonymous*

**Physics**

This assignment is about energy. But one of the new things we’ve just learned about is spring forces, so there should be a question about them. So the first parts of this question are not about energy. One end of a spring is attached to the ceiling. The unstretched length...
*Monday, November 23, 2015 by Anonymous*

**Physics**

A low friction cart (similar to what you use in the lab) collides with a second low friction cart. Cart A has a mass of 0.500 kg and cart B has a mass of 0.750 kg. Glider A was moving at 40.0 cm/s before the collision. Glider B was at rest. (a) The carts have velcro on them so...
*Monday, November 23, 2015 by Anonymous*

**Physics**

two air carts of mass m1=0.87kg and m2=0.48kg are placed on a frictionless track.cart 1 is at rest initally, and a spring bumper with a force constant of 690N/m. cart 2 has a flat metal surface for a bumper, and move toward the bumper of the stationary cart with an intial ...
*Monday, November 23, 2015 by Has*

**physics**

Two satellite are monitored as they orbite the earth,satellites Y is foure times as far from the earth's centere as is satellite X. if the period of revolution of satellite X is T. What is the period of revolution of Y?
*Monday, November 23, 2015 by debiru*

**Physics**

A 70.0 kg boy compresses a spring by 0.500 m and slides down a frictionless slide. The slide leads into a 30° ramp that has a coefficient of kinetic friction of 0.110 with the boy. If the spring constant in the spring is 52000 N/m and the slide has a height of 41.0 m, what...
*Monday, November 23, 2015 by Anonymous*

**physics**

5kg particle is atteched at a rim of arotating wheel of radius 2m. the wheel completes each revolution in 3 seconds. The total moment of inertia of the system(I partics+I wheel) is 2kg.m^2 A.determine the rotational kinetic energy of the system? B.the work needed to stop the ...
*Monday, November 23, 2015 by degefech*

**physics **

the cofficient of friction b/n the tyre of the car rotating around horizontal circuar road way is 0.5; what would the minimum radius at which acar turn ahorizontal road when its speed is 15m/s?g=10m/s
*Monday, November 23, 2015 by bediru*

**physics**

The coefficient of friction b/n the Tyre of the car rotating around horizontal circulary road and the road way is 0.5; what would the minimum radius at which a car turn ahorizontal road when its speed is 15m/s? g=10m/s
*Monday, November 23, 2015 by bediru *

**physics **

A uniform solid cylinder of mass 1kg roll with out slipping on aflat surface at aspeed of 4m/s. What is the total kinetic energy of the cylinder?
*Monday, November 23, 2015 by ali*

**Physics**

A 79.5 kg snowboarder heads down a 28.0° hill that has a height of 62.8 m. If the hill is assumed to be frictionless and there is horizontal wind with a force of 98 N acting against the snowboarder, find the speed of the snowboarder as they reach the bottom of the hill ...
*Monday, November 23, 2015 by Anonymous*

**physics**

a small mass of 2kg tide the string of length 3cm complete 4revolutions in one second in horizontal circle. What is the tangential displacement of the body in 5seconds?
*Monday, November 23, 2015 by abidi*

**physics**

what minimum initial velocity must aprojectile have to reach atarget at a distance of 25m away? (g: 10m/s)
*Monday, November 23, 2015 by jemal*

**physics **

A uniform chain 10m long and weighing 6 kg permetre hangs vertically.calculate the work required to wind it up.. Plzz solve it
*Monday, November 23, 2015 by arya*

**Physics**

A gram of living plant material with Carbon-14 , decays at a rate of about 16 disintegrations per minute. When the plant dies, the Carbon-14 decays, with a half-life of 5600 years. A gram of the dead plant is found to decay at about 1 disintegration per minute. Calculate the ...
*Monday, November 23, 2015 by Deidre*

**physics**

Calculate the Specific Gravity of an object that sinks in water if m = 21.97 g and mA = 17.40 g.
*Monday, November 23, 2015 by Kim*

**Physics**

In a machine a cylinder with a mass of 80.0 g is pushed down into a hole with a spring at the bottom as shown in Figure 1. When the spring is uncompressed the cylinder rests on top of it with its end just at the entrance to the hole. The cylinder is pushed by a rod which is ...
*Monday, November 23, 2015 by Hermans*

**Physics**

A very large roller coaster has an initial hill that has an 85 m drop. Note that a roller coaster has no engine. After being pulled up the first hill by a chain the train moves along the track with only gravity, normal forces due to the track, friction and air drag acting on ...
*Monday, November 23, 2015 by Hermans*

**Physics**

3. A low friction cart (similar to what you use in the lab) collides with a second low friction cart. Cart A has a mass of 0.500 kg and cart B has a mass of 0.750 kg. Glider A was moving at 40.0 cm/s before the collision. Glider B was at rest. (a) The carts have velcro on them...
*Monday, November 23, 2015 by Daniel*

**Physics**

One end of a spring is attached to the ceiling. The unstretched length of the spring is 10.0 cm. A 2.0 kg mass is hung from the other end of the spring. It is slowly lowered until it comes to rest. At this point the spring is 15 cm long. (a) What is the stiffness (spring ...
*Monday, November 23, 2015 by Daniel*

**Physics**

A small rock with mass m moves at velocity v0 and hits a rod of mass M as shown. The rod is initially at rest. The collision is completely inelastic. a) What is the angular velocity of the rod after the collision? b) What is the maximum angle the rod makes with the vertical?
*Monday, November 23, 2015 by Jack*

**Physics**

The typical lifetime of a star like our Sun is 10 billion years. While a star like our Sun is able to generate energy in its core (through fusion) the thermal pressure balances the gravitational pressure from the Sun’s mass. However, once the star rules our of hydrogen, ...
*Monday, November 23, 2015 by Vivek*

**Physics**

A round object with mass m and radius R rolls down a ramp that makes an angle θ with respect to the horizontal. You can assume there is static friction so that the object rolls without slipping. a) For now, take the moment of inertia of the object to be I (you do not know...
*Monday, November 23, 2015 by Vivek*

**PHYSICS**

Two forces, one four times as large as the other pull in the same direction a 10kg mass and impart to it an acceleration of 2.5 m/s^2. if the smaller force is removed. what is the acceleration of the mass?
*Monday, November 23, 2015 by Camz*

**PHYSICS**

Two forces of magnitude 6N and 4N act on a body. what is the ratio of the acceleration produce when these forces are acting in the same direction to the acceleration when oppositely directed ?
*Monday, November 23, 2015 by Camz*

**Physics**

A car travels at 80 km/h on a level road in the positive direction of an x axis. Each tire has a diameter of 66 cm. Relative to a woman riding in the car and in unit-vector notation, what are the velocity at the (a) center, (b) top, and (c) bottom of the tire and the magnitude...
*Monday, November 23, 2015 by Abdullah*

**Physics**

A marble is thrown horizontally with a speed of 13.9 m/s from the top of a building. When it strikes the ground, the marble has a velocity that makes an angle of 40 ° with the horizontal. From what height above the ground was the marble thrown?
*Monday, November 23, 2015 by Stark*

**Physics 1100**

In a tug of war, two teams pull on opposite ends of a rope, attempting to pull the other team across a dividing line. Team A accelerates toward team B at the rate of 0.106 m/s2. Find all the horizontal forces acting on each team if the weight of each team is 1.04 104 N and the...
*Sunday, November 22, 2015 by Tess*

**physics**

What is the difference in blood pressure (mm-Hg) between the bottom of the feet and the top of the head of a 1.57-m-tall person standing vertically? 1 mm-Hg = 133 N/m2. The density of blood is 1050 kg/m3.
*Sunday, November 22, 2015 by arshi*

**physics**

A(n) 2165.7 kg car is coasting along a level road at 35.5 m/s. A constant braking force is applied, such that the car is stopped in a distance of 52.7 m. What is the magnitude of the braking force? Answer in units of N.
*Sunday, November 22, 2015 by Saykar*

**Physics IB **

A speeder passes a parked police car at a constant speed of 27.3 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.55 m/s2 . a) How much time passes before the speeder is overtaken by the police car? b) How far does the speeder travel ...
*Sunday, November 22, 2015 by Isabel Delaney*

**College physics**

a person drives northward (90 degrees) at 15m/s in a truck that weighs 2500kg. a second person driving a car that weighs 1600 kg drives southwest (225 degrees) at 16 m/s. They have a perfectly inelastic collision. What is the direction and speed of the two vehicles immediately...
*Sunday, November 22, 2015 by ben*

**College Physics- buoyancy problem**

To an order of magnitude, how many helium-filled toy balloons would be required to lift you? Because helium is an irreplaceable resource, develop a theoretical answer rather than an experimental answer. Assume that you have a mass of approximately 70 kg, the radius of a ...
*Sunday, November 22, 2015 by Dumb Student*

**Physics**

for every 10 m you descend below the surface of water, the pressure on you will increase by an amount equal to atmospheric pressure 101kpa. an air bubble in a lake has a volume of 20 mm^3 at a depth of 40m. predict what volume it will have just before reaches the surface?
*Sunday, November 22, 2015 by Gersum*

**PHYSICS**

Given a planar electromagnetic wave in vacuum whose B-field is denoted by Bx = 0, Bz = 0, B_y = 66.7 × 〖10〗^(-8) sin 4π〖10〗^6 (z-3×〖10〗^8 t) Write an expression for the E-field. What are wavelength, speed and ...
*Sunday, November 22, 2015 by NOONY*

**PHYSICS**

A plane electromagnetic wave moving through free space has an E- field given by E_x=0; E_y=0; E_z=100 sin[8π×〖10〗^14 (t- x/(3×〖10〗^8 ))]. Calculate the corresponding flux density.
*Sunday, November 22, 2015 by NOONY*

**PHYSICS**

Given a plane harmonic wave of wavelength , propagating with a speed v in a direction given by the unit vector (i ̂+ j ̂ )/√2 in Cartesian coordinates. Write an expression for the wave function. Here i ̂ ,j ̂,k ̂ are the usual unit basis...
*Sunday, November 22, 2015 by NOONY*

**PHYSICS**

1. Write an expression for a R - state lightwave of angular frequency and amplitude E0 propagating in the positive x-direction such that at t=0 and x=0 the E-field points in the negative z-direction.
*Sunday, November 22, 2015 by NOONY*

**Physics**

an elastic band is stretched a distance of 0.150m by a force of 100.0
*Sunday, November 22, 2015 by Anonymous*

**Physics**

To an order of magnitude, how many helium-filled toy balloons would be required to lift you? Because helium is an irreplaceable resource, develop a theoretical answer rather than an experimental answer. Assume that you have a mass of approximately 70 kg, the radius of a ...
*Sunday, November 22, 2015 by Student who needs help*

**Physics**

Which needs more energy: to heat 5 kg of copper from 20 degrees celcius to 50 degrees celcius or to heat 0.5 kg of water from 20 degrees celcius to 50 degrees celcius?
*Sunday, November 22, 2015 by Ann*

**Physics**

Two objects of different masses are joined by a light rod. a) Id the moment of inertia about the center of mas the minimum or maximum and why? b) If the two masses are 3kg and 5kg and the length of the rod is 2m, what are the moments of inertia of the system about an axis ...
*Sunday, November 22, 2015 by Anna*

**physics**

filament lamp: cost-80p efficiency-0.2 expected life- 1000 hours compact fluorescent lamp (CFL): cost- £3.00 efficiency-0.8 expected life- 8000 hours A filament lamp with a power rating of 100 w gives 2000 units of light. what power rating would a CFL need to provide ...
*Sunday, November 22, 2015 by sam*

**physics **

An object of size 3cm is placed 14cm in front of a concave lens of focal length 21cm calculate position and size of the image?
*Sunday, November 22, 2015 by Zainab *

**Physics**

Using the data in the table below,determine how many calories are needed to change 100g of solid x at 10degrees celcious to a vapour at 210degrees celcious:thermodynamic constants for substance x: heat of fusion 40,0cal/g heat of vaporization 150,0cal/g melting point 10,0'...
*Sunday, November 22, 2015 by John*

**Physics**

011 10.0 points Masses 18 kg and 9 kg are connected by a light string that passes over a frictionless pulley as shown in the figure. The acceleration of gravity is 9.8 m/s2 . 18 kg 9 kg If the 18 kg mass, initially held at rest on the table, is released and moves 1.7 m in 1.4 ...
*Saturday, November 21, 2015 by Madison*

**Physics**

The earth spins on its axis once a day and orbits the sun once a year (365 1/2 days). Determine the average angular velocity (in rad/s) of the earth as it (a)spins on its axis and (b) orbits the sun. In each case, take the positive direction for the angular displacement to be ...
*Saturday, November 21, 2015 by Jose Luis*

**Physics**

question 1 ..A 5 kg rock is thrown vertically upward at 12 m/s. How high did the rock rise? question 2 The driver of a truck traveling at 126 km/h on a highway sees a sign which indicated that 800 m after the sign the maximum speed will be 90 km/h . When the truck passes the ...
*Saturday, November 21, 2015 by Axe*

**lighthouse christian college**

Wich career can I take when I took english,afrikaans,lo,physics and pure maths?
*Saturday, November 21, 2015 by mthofire*

**physics**

A hunter fires 50 g bullets from a machine gun. If each bullet moves with a velocity of 150ms−1 how many such bullets are to be fired into a tiger of mass 60 kg coming towards him with a velocity of 10ms−1 in order to stop the tiger?
*Saturday, November 21, 2015 by Anonymous*

**Physics**

Szymon and Chris fly their balloon around the earth in 80 days. Taking the radius of the earth to be 6400 km, calculate their average speed in m/s. I did answered all the homework questions but I didn't know how to do this one?
*Saturday, November 21, 2015 by Andrew*

**physics**

A lineaer spring having a force constant k=40 N/m hangs vertically,supporting a 0.8 kg mass.the mass is then pulled down a distance of 0.15 m . During up and down oscillations ,the maximum speed of the mass will be..
*Saturday, November 21, 2015 by Abi*

**Physics **

A race car starts from rest on a circular track of radius 279 m. The car's speed increases at the constant rate of 0.760 m/s2. At the point where the magnitudes of the centripetal and tangential accelerations are equal, find the following a) the speed of the race car? m/s ...
*Saturday, November 21, 2015 by Anonymous*

**physics**

Two horses pull horizontally on ropes attached to a tree stump (Fig. 3). Each horse pulls with a force of magnitude F. If the angle between the two ropes is 126O, what is the resultant force?
*Saturday, November 21, 2015 by fiz*

**Physics AP**

A 32 kg child goes down a straight slide inclined 38∘ above horizontal. The child is acted on by his weight, the normal force from the slide, and kinetic friction. How large is the normal force of the slide on the child?
*Friday, November 20, 2015 by raquel *

**Physics**

A car of mass 1390 kg rests on a hydraulic lift with a piston of radius 0.26 m that is connected to a second piston of radius 0.033 m. If the car is just barely lifted off the ground, what is the force at the second piston? I Tried F1/F2 = r1^2 / r2^2 ==> 1390x10 / F2 = 0....
*Friday, November 20, 2015 by Noel*

**Physics**

A 180 pound body is dropped from a helicopter 5 miles (26400 ft.) up - - what maximum speed would the body attain, in miles per hour, before hitting the ground? Disregard gravity, air density, etc. factors, a very rough approximation is all that is needed. Thanks.
*Friday, November 20, 2015 by Bill*

**Physics**

A baseball player dives into third base with a speed of 7.90 m/s. If the coefficient of friction between the player and the ground is 0.41, how far does the player slide before coming to rest?
*Friday, November 20, 2015 by Alyyssa*

**Physics**

At the airport, you pull a 15kg suitcase across the floor with a strap that is at an angle of 45 degrees above the horizontal. Find the normal force and the tension in the strap if the suitcase is pulled at a constant speed and the coefficient of kinetic friction is 0.36.
*Friday, November 20, 2015 by Alyyssa*

**Physics**

A builder wants to build a corbeled arch, based on the principle of stability, what minimum number of bricks, each 0.30 m long, is needed if the arch is to span 1.0 m? Be sure to include in the total number of bricks one brick on top and one brick at the base of each half-span...
*Friday, November 20, 2015 by Anonymous2.0*

**Physics 12 college preparation **

Find the work done by a traveller carrying a suitcase of mass 8.2 kg by pulling up on it when walking forward for a distance of 120 m . Explain your reasoning
*Friday, November 20, 2015 by Ahmed*

**Physics**

A set of density rods is designed to illustrate the concept of density. The idea is to create cylinders of equal diameters and masses, but varying lengths, to show which have the largest and smallest densities. (a) Derive a formula that will predict the ratio of the length of ...
*Friday, November 20, 2015 by Alyssa*

**Physics**

Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.7 m diameter and a mass of 270 kg . Its maximum angular ...
*Friday, November 20, 2015 by Jay*

**physics**

what is the acceleration of a car going 25m/s on a cloverleaf with a radius of 45 m?
*Friday, November 20, 2015 by kelly*

**physics**

an object of height 5 cm is placed at a distance of 2m in front of a mirror and its image is obtained on a screen.Find the distance of screen from the mirror,nature of the mirror and its focal length.
*Friday, November 20, 2015 by Anonymous*

**physics**

why water from soil does not evaporate?
*Friday, November 20, 2015 by heat*

**Physics**

If a 180 pound body is dropped from an airplane 5 miles (26400 ft.) up: a/ how long would it take for the body to reach the ground? b/ what would be the maximum speed the body would attain in miles per hour? Close approximations are all that are required here. Thanks.
*Friday, November 20, 2015 by Bill*

**Physics**

Four bricks are to be stacked at the edge of a table, each brick overhanging the one below it, so that the top brick extends as far as possible beyond the edge of the table. *The construction in stable equilibrium, bricks must extend no more than (starting at the top) 1/2, 1/4...
*Friday, November 20, 2015 by Anonymous2.0*

**Physics [Help, need answer in 10 min]**

During a solar eclipse, the moon (of mass 7.36 × 1022 kg), Earth (of mass 5.98 × 1024 kg), and Sun (of mass 1.99 × 1030 kg) lie on the same line, with the moon between Earth and the Sun. What gravitational force is exerted on the moon by the Sun? The ...
*Thursday, November 19, 2015 by James*

**physics**

the following point charges are placed on the x-axis: +2.0μC at x=20cm,-3.0μC at x=30cm and -4.0μC at x=40cm. What is the potential at x=0?
*Thursday, November 19, 2015 by christine*

**physics**

two point charges +q and -q are separated by a distance d. aside from infinity, where else is the potential due to these two charges 0?
*Thursday, November 19, 2015 by christine*

**Physics**

If a 180 pound body was dropped from a plane 5 miles in the air - how long would it take for the body to reach the ground?
*Thursday, November 19, 2015 by Bill*

**Physics**

If you want to design a set of five density rods (made of aluminum, iron, copper, brass, and lead), determine the ratios of the lengths of each rod to the length of the lead rod, the densest material in the group. The specific gravities of the elements are approximately SG ...
*Thursday, November 19, 2015 by Alyssa*

**Physics**

Find the pressure at the bottom of a swimming pool that is 1.1 m deep.
*Thursday, November 19, 2015 by m*

**Physics**

A 5.0 kg skater begins a spin with an angular speed of 4 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one half its initial value. What is the skater's final angular speed? I know the answer to be 8 rad/s, however, I thank you ...
*Thursday, November 19, 2015 by Jose Luis*

**Physics**

At the moment when a shotputter releases a 7.26 kg shot, the shot is 2.0m above the ground and travelling at 15.0 m/s. It reaches a maximum height of 8.0m above the ground and then falls to the ground. Assume that air resistance is negligible. What is the final velocity of the...
*Thursday, November 19, 2015 by A*

**physics**

A series circuit consist of 6 ohms resistor,ammeter and battery. The current in the circuit is 0.5A but drops to 0.3A when another resistor of 8ohms is added in series. Find the battery e.m.f and its internal resistance?
*Thursday, November 19, 2015 by davies*

**Physics**

A 5.0 kg skater begins a spin with an angular speed of 4 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one half its initial value. What is the skater's final angular speed? I thank you in advance for your time. JL
*Thursday, November 19, 2015 by Jose Luis*

**Physics **

A cyclist travels a distance of 1200m due north before going 200m due east followed by 500m south-west.Draw a scale diagram to calculate the cyclist's displacement from her initial position.
*Thursday, November 19, 2015 by Amna*

**PHYSICS**

A BATH CONTAINS 100 KG OF WATER AT 60 DEGREES CELCIUS. HOT AND COLD TAPS ARE THEN TURNED ON TO DELIVER 20KG PER MINUTE EACH A TEMPERATURE 70 DEGREES CELSIUS AND 10 DEGREES CELSIUS RESPECTIVELY. HOW LONG WILL IT BE BEFORE THE TEMPERATURE IN THE BATH HAS DROPPED TO 45 DEGREES ...
*Thursday, November 19, 2015 by LANRE*

**Physics**

The 9-ball travelling and strikes the 13-ball, which is of equal mass and at rest. If this is an elastic collision, which statement below is true? Marks 3+4 = 7 a) All of the 9-ball’s energy and momentum are transferred to the 13-ball. b) All of the 9-ball’s energy ...
*Thursday, November 19, 2015 by Asma *

**Physics**

The following calculations are for EM radiation, for which the internal energy U=Vu, where u=u(T)is the total energy density. a) Show that (∂S/∂T)_v=V/T(du/dT), and (∂S/∂V)T=(u+P)/T Note: use the answers in part a in part b and c b) Using Stefan-...
*Thursday, November 19, 2015 by Sara*