Friday

February 12, 2016
**Physics 30**

A system containing a frictionless pulley is described in the diagram on the right (the 2.0 kg box is on the floor while the 3.0 kg box is 0.5m high) . If this system is released, what will be the momentum of: A. the 2.0 kg box when the 3.0 kg box hits the floor? b. the 3.0 kg...
*Saturday, January 23, 2016 by Mona *

**physics**

A ball is thrown straight up at 20.0 m/s. How fast is the ball moving after 2.00 s?
*Saturday, January 23, 2016 by elli*

**Physics 30**

A system containing a frictionless pulley is described in the diagram on the right (the 2.0 kg box is on the floor while the 3.0 kg box is 0.5m high) . If this system is released, what will be the momentum of: A. the 2.0 kg box when the 3.0 kg box hits the floor? b. the 3.0 kg...
*Saturday, January 23, 2016 by Mona *

**Physics**

A ball is thrown straight up at 24.0 m/s. Ignore the effects of air resistance in your calculations.After 2.00 s?
*Saturday, January 23, 2016 by Kayla*

**Sta 112**

This is my question every one . Please help me have it already I had 6 as my answer. In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also 4 of them offer physics and chemistry but not biology,3 offer physics and biology but not ...
*Saturday, January 23, 2016 by Anonymous*

**Physics**

A car starts from rests and accelerates at a rate of 4 feet per second squared. How far does the car travel in 10 seconds?
*Saturday, January 23, 2016 by Robin*

**Physics 30**

A frictionless pulley (a 2.0 kg is on the floor while the 3.0 kg is 0.5m high) . when released, momentum of the 2kg is?
*Saturday, January 23, 2016 by Mona *

**Physics**

A student drops a lead ball 4" in diameter from the top of a large live oak tree. As the ball is falling, a bird flies under it, slowing the ball's velocity to 30 feet/sec. Two seconds later the ball strikes the ground. What is the coefficient of friction due to air ...
*Saturday, January 23, 2016 by Johnny*

**Physics**

Hail forms high in the atmosphere and can be accelerated to a high speed before it reaches the ground. Estimate the terminal speed of a spherical hailstone that has a diameter of 2.8 cm. Hint: The mass of a piece of hail that has a volume of 1 cm3 is about 1 g.
*Saturday, January 23, 2016 by Kirsten*

**Physics**

Car A travelling at 13 m/s [N] is 190m behind car B which is travelling at 9.0 m/s [N]. At this moment car A starts to accelerate at 6.0 m/s^2 [N] to catch up with car B. After 1.0s, car B also starts to accelerate at 2 m/s^2 [N]. How long will it take car A to catch up with ...
*Saturday, January 23, 2016 by jerry*

**PHYSICS**

Do the mass of a body determine the gravity they possess(sun)
*Saturday, January 23, 2016 by STEVIUM*

**physics **

The weight of a solid in air is four times greater than the weight of solid in water. Find its weight of which solid in water if it has relative density is 64.
*Saturday, January 23, 2016 by Jefferson *

**PHYSICS**

WORKER ARE LOADING EQUIPMENT INTO A FREIGHT ELEVATOR AT THE TOP FLOOR OF A BUILDING HOWEVER THEY OVERLOAD THE ELEVATORAND THE WORN CABLE SNAPS THE MASS OF THE LOADED ELEVATOR AT THE TIME OF THE ACCIDENT IS 1600KG..AS THE ELEVATOR FALLS,THE GUIDE RAILS EXCERT A CONSTANT ...
*Saturday, January 23, 2016 by WASEEM*

**PHYSICS**

A CAR IS MOVING INITIALLY AT A SPEED OF 50MI/H WEIGHTING 3000LB IS BROUGT TO A STOP IN A DISTANCE OF 200FT FIND THE BRAKING FORCE.AND FIND TIME REQUIRED TO STOP ASSUMING THE SAME BRAKING FORCE..AND FIND THE DISTANCE AND TIME REQUIRED TO STOP IF THE CAR WERE GOING 25MI/H ...
*Saturday, January 23, 2016 by WASEEM*

**PHYSICS**

WHAT IS THE MASS AND WEIGHT OF 1420LB OF SNOMOBILE AND 412KG OF HEAT PUMP?
*Saturday, January 23, 2016 by WASEEM*

**Physics**

with what minimum speed must a ball be thrown straight up in order to reach a height of 34 meters above the launch position?
*Friday, January 22, 2016 by Kay*

**Physics**

what are 2 examples of elastic collisions not discussed in class
*Friday, January 22, 2016 by Rebecca S.*

**physics**

a 1200kg car is moving on the freeway at 30 m/s. (a) Find the magnitude of its momentum and its kinetic energy in SI units. (b) At what speed, in m/s, will the car's momentum be half of what it is in part (a). (c) At what speed, in m/s, will the cars kinetic energy be half...
*Friday, January 22, 2016 by van*

**Damon or DrBob please help..chemistry/physics**

Question: 0.37 litre of an ideal monatomic gas (Cv,m = 3R/2) initially at 51 °C and 36 atm pressure undergo an expansion against a constant external pressure of 1.06 atm, and do 2.3 kJ of work. The final pressure of the gas is 1.06 atm. Calculate the change in enthalpy, &#...
*Friday, January 22, 2016 by Ashley*

**physics**

a mass if 10kg move with a velocity of 4ms-1find it kinetic energy.
*Friday, January 22, 2016 by lydia*

**physics **

a 0.300kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.80 m/s when it makes a head on collision with a stationary 0.150kg glider. (a) Find the magnitude and direction of the final velocity of each glider in the collision is elastic. (...
*Friday, January 22, 2016 by chyenne*

**physics**

a 2646lb car is moving on the freeway at 69 mph. (a) Find the magnitude of its momentum and its kinetic energy in SI units. (b) At what speed, in m/s, will the car's momentum be half of what it is in part (a). (c) At what speed, in m/s, will the cats kinetic energy be half...
*Friday, January 22, 2016 by chyenne*

**Physics **

A Boeing 747 "Jumbo Jet" has a length of 59.7 m. The runway on which the plane lands intersects another runway. The width of the intersection is 25.0 m. The plane decelerates through the intersection at a rate of 5.0 m/s2 and clears it with a final speed of 29 m/s. ...
*Friday, January 22, 2016 by Adriana*

**Physics**

For stephen . .Can we make or combine tachyons with shoes to increase our speed to approach the speed of light. If u have gone to d past how do u intend to come bak presently
*Friday, January 22, 2016 by Afeez*

**physics **

A body has mass 400kg on earth. What will be it mass on the moon if the Acceleration due to gravity is 9.8m/s2?
*Friday, January 22, 2016 by Nyame Godfred *

**physics **

Help me to answer this!! What is meant by energy-mass relationship?w Explain with examples.
*Friday, January 22, 2016 by Ali*

**physics**

a cyclist does work at the rate of 500w while riding. how much force does her foot push with, when she is traveling at 8.0 m/s?
*Friday, January 22, 2016 by ty*

**physics**

How much effort force would be needed to roll a barrel with a resistance force of 100N up an inclined plane with a height of 2m and an inclined plane of 8m?
*Friday, January 22, 2016 by Jean*

**physics**

For an ocean wave that has the crests 6 m apart and passing a boat every two seconds, calculate the speed of the wave.
*Friday, January 22, 2016 by sam*

**Physics**

HOW MUCH HEAT IS ABSORBED WHEN THE BLOCK OF COPPER OF MASS 0.05kg and specific capacity 390j/kg is heated for 20 degree celsius and 70 degree celsius
*Friday, January 22, 2016 by Supreme*

**physics **

the turn ratio of transformer is 1:10.A battery of 12v is connected to the primary coil,what is the voltage drop across the secodary coil
*Friday, January 22, 2016 by balu*

**physics**

: what is the density of an object with the mass 60g and volume 25cm cube
*Friday, January 22, 2016 by Majesty*

**Physics**

An automobile having a mass of 1220 kg is driven into a brick wall in a safety test. The bumper behaves like a spring of constant 2.42 × 106 N/m and compresses 2.99 cm as the car is brought to rest. What was the speed of the car before im- pact, assuming no energy was ...
*Friday, January 22, 2016 by Emma*

**Physics **

A 500kg piano is being lowered into position by a crane while to people steady it with ropes pulling to the sides.Bob's rope pulls to the left, 15' below the horizontal, with 500N of tension.Ellen's rope pulls toward the right, 25' below horizontal. a)What ...
*Friday, January 22, 2016 by King *

**fluid physics**

Water is pumped through a pipe of diameter 15.0 cm from theColorado River up to Grand Canyon Village, on the rim of thecanyon. The river is at 564 m elevation and the village isat 2096 m. (a) At what minimum pressure must the water be pumped to arrive atthe village? (b) If ...
*Thursday, January 21, 2016 by Johnneybrib*

**physics**

A baseball pitcher throws a baseball with a speed of 48 m/s . In throwing the baseball, the pitcher accelerates it through a displacement of about 3.5 m, from behind the body to the point where it is released how long was it in the air before returning to earth?
*Thursday, January 21, 2016 by linds*

**Physics**

A 5 kg ball is moving 4m/s to the right when it collided least ally with a 2 kg ball moving at 6 m/s to the left. After the collision, the 5 kg ball is moving .8 m/s to the right. What is the velocity of the 2 kg ball?
*Thursday, January 21, 2016 by Brock*

**physics**

a 200 N wooden platform is suspended from the roof of the house by ropes attached to it's ends. it has a total length of 4.2 meters. a painter weighing 650 N stands from the left end of the platform. find the tension in each end of the ropes .
*Thursday, January 21, 2016 by jessa*

**physics **

In a certain right triangle, the two sides that are perpendicular to each other are 7.00 m and 8.30 m long. What is the tangent of the angle for which 7.00 m is the opposite side?
*Thursday, January 21, 2016 by john*

**physics **

In a certain right triangle, the two sides that are perpendicular to each other have lengths h = 4.40 m and b = 8.70 m. What is the length of the third side of the triangle?
*Thursday, January 21, 2016 by john*

**physics **

A right triangle has a hypotenuse of length 2.00 m, and one of its angles is 24.0°. What are the lengths of the following sides? (a) the side opposite the 24.0° angle (b) the side adjacent to the 24.0° angle
*Thursday, January 21, 2016 by john*

**Physics **

An object of mass m = 2.9 g and charge Q = +42 µC is attached to a string and placed in a uniform electric field that is inclined at an angle of 30.0° with the horizontal. The object is in static equilibrium when the string is horizontal. a) Find the magnitude of the...
*Thursday, January 21, 2016 by Alexa*

**Physics**

A car travels at a constant speed around a circular track whose radius is 2.8 km. The car goes once around the track in 430 s. What is the magnitude of the centripetal acceleration of the car?
*Thursday, January 21, 2016 by Melanie*

**physics 1**

A ladder 8.70 m long leans against the side of a building. If the ladder is inclined at an angle of 69.0° to the horizontal, what is the horizontal distance from the bottom of the ladder to the building?
*Thursday, January 21, 2016 by jojo*

**Physics**

A wheel is rotating at a rate of 2.5 revolutions every 3.6 s. Through what angle, in radians, does the wheel rotate in 1.0 s?
*Thursday, January 21, 2016 by Melanie*

**physics 1**

The base of a pyramid covers an area of 13.0 acres (1 acre = 43,560 ft2) and has a height of 481 ft. If the volume of a pyramid is given by the expression V = (1/3)bh, where b is the area of the base and h is the height, find the volume of this pyramid in cubic meters.
*Thursday, January 21, 2016 by jojo*

**physics 1**

A house is 80.0 ft long and 22 ft wide, and has 8.0 ft high ceilings. What is the volume of the interior of the house in cubic meters and cubic centimeters?
*Thursday, January 21, 2016 by jojo*

**Physics **

During takeoff, a plane goes from 0 to 50 m/s in 8s. What is its acceleration? Halos fast is it going after 5 s? How far had it traveled by the time it reaches 50 m/s?
*Thursday, January 21, 2016 by Ang*

**Physics **

A boy whose mass is 40kg runs up a flight of 30 steps each.150mm,in 6secs find d average power developed (take g =10m/s sguaree)
*Thursday, January 21, 2016 by Olu *

**physics**

water flow at 0.65m/s through a 3-cm diameter hose.at the end of the hose is a 0.3cm diameter nozzle,at what speed does the water pass through the nozzle?
*Thursday, January 21, 2016 by mulu muler*

**maths**

in a class of 35 students twice as many study chemistry and study physics half a many study chemistry as study both subjects illustrate it on a venn diagram
*Thursday, January 21, 2016 by owusu afriyie*

**physics**

a ball bounces to 60% of its original height.what fraction of its mechanical energy is lost in each bouces?where does this energy go?
*Thursday, January 21, 2016 by akash*

**physics 2**

In Figure below the hand moves the end of the Slinky up and down through two complete cycles in one second. The wave moves along the Slinky at a speed of 0.545 m/s. Find the distance between two adjacent crests on the wave.
*Wednesday, January 20, 2016 by Drea*

**Physics**

A brick is thrown horizontally off the top of a building at 7 m/s. If the building is 31m tall, how far from the base of the building will the brick land.
*Wednesday, January 20, 2016 by Millie*

**Physics**

You're sailboarding at 7.0 m/s when a wind gust hits, lasting 6.3 s accelerating your board at 0.51 m/s2 at a 35∘ to your original direction. a) Find the magnitude of displacement during the gust. b) Find the direction of your displacement during the gust.
*Wednesday, January 20, 2016 by Anonymous*

**Physics**

There are 2 point charges. Q1 is 4nC and is at (-2,0). Q2 is -2nC and is at (0,3). How much work does the electric field do when a third point charge of +3.00 nC is moved from infinitely far away and placed at the origin? I know infinitely far means Va will be 0. However ...
*Wednesday, January 20, 2016 by Sammie*

**Physics**

How much work does a 50 kg student to climb 3 meters high stairs
*Wednesday, January 20, 2016 by Jose *

**Physics **

In what ratio the mass 4m should be split so the value of gravitational force comes maximum for a fix distance d between the masses? F=G(4m-x)/r^2 G/r^2(4m-x^2)
*Wednesday, January 20, 2016 by Aarifah *

**Physics **

In what ratio the mass 4m should split so that value of gravitational force comes Maximum for a fix distance d between the masses?
*Wednesday, January 20, 2016 by Anonymous*

**Physics**

A gun is fired vertically into a 1.60 kg block of wood at rest directly above it. If the bullet has a mass of 21.0 g and a speed of 195 m/s, how high will the block rise into the air after the bullet becomes embedded in it?
*Wednesday, January 20, 2016 by Jeff*

**physics **

Plz plz answer this question..... I need this immediate.... "what is ment by the energy-mass relationship?explain it with the help of examples.....
*Wednesday, January 20, 2016 by Akbar*

**physics**

A body of mass 5kg is to be given an acceleration of 20m/s2.calculate the force required when acceleration is vertically upwards (g=10m/s2)
*Wednesday, January 20, 2016 by Abdullahi*

**Physics **

Plz plz answer this question..... "what is ment by the energy-mass relationship?explain it with the help of examples.....
*Wednesday, January 20, 2016 by Ali*

**Physics**

The density of lead is 11.35g.cm.what will be the mass in kilograms of a 2dm sample of lead ?
*Wednesday, January 20, 2016 by Lindokuhle*

**physics**

an aluminum cylinder, of height h=2ocm and of radius r=1ocm, rests with its base on a horizontal table. Density of aluminum P=2700kg/m^3 a-calculate the weight of the cylinder take g=10N/kg b-what is the value of the force exerted by the table on the cylinder? c-deduce the ...
*Wednesday, January 20, 2016 by julia*

**Physics**

A fighter plane is directly over an anti aircraft gun at a time t=0. The plane has a speed of 600km/hr. A shell is fired from an anti aircraft gun at the time t=0, in order to hit the plane. The muzzle velocity V is 1100m/s. Determine the distance the gun should be aimed ahead...
*Wednesday, January 20, 2016 by Gabriel*

**physics**

A monkey standing on the ground wants to climb to the top of a vertical pole 13m tall.he climbs 5m to 1seconds and slips downward 3m in the next 1seconds..he again climbs 5m in 1sec ANd slips by 3m in the next second and so on..draw the x-t graph of his motion and hence find ...
*Wednesday, January 20, 2016 by kaycee*

**Physics...please help me out..**

A body of mass 7.5kg is to be pulled up along a plane which is inclined at 30degree to the horizontal. If the efficiency of the plane is 75 %, what is the minimum force required to pull the body up the plane?
*Wednesday, January 20, 2016 by Angela *

**physics**

an enemy plane is flying horizontally at an altitude of 2.0Km,with a speed of 3.0m/s.an army man with a gun on the ground sights the enemy plane and fires a shell with a muzzle speed of 600m/s when d plane Is directly overhead.at what angle to the ground should the plane be ...
*Wednesday, January 20, 2016 by kaycee*

**Physics**

A body of mass 7.5kg is to be pulled up along a plane which is inclined at 30degree to the horizontal. If the efficiency of the plane is 75%,what is the minimum force required to pull the body up the plane?
*Tuesday, January 19, 2016 by Angela *

**Physics - Repost because of no response**

1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] and the second stone moves away at a velocity of 1.25 m/s [N44oE], what was the initial velocity of the ...
*Tuesday, January 19, 2016 by Chanz*

**physics**

A cue ball (mass = 0.145 kg) is at rest on a frictionless pool table. The ball is hit dead center by a pool stick, which applies an impulse of +1.45 N · s to the ball. The ball then slides along the table and makes an elastic head-on collision with a second ball of ...
*Tuesday, January 19, 2016 by Isabelle*

**Physics**

A machine of efficiency 80% is used to raise a load of body of mass 75kg through a vertical height of 3m in 30seconds.Calculate the power input.
*Tuesday, January 19, 2016 by Angela *

**Physics **

A simple machine with an efficiency of 75% lift of a load of 5000N.When a force of 500N is applied to it,Calculate the velocity ratio of the machine.
*Tuesday, January 19, 2016 by Angela *

**Physics**

work done by 975 kilograms from 25 m/s to 65 m/s
*Tuesday, January 19, 2016 by Jimmy*

**Physics - Am I correct? **

1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] and the second stone moves away at a velocity of 1.25 m/s [N44oE], what was the initial velocity of the ...
*Tuesday, January 19, 2016 by Chanz*

**physics**

A person is standing at the edge of the water and looking out at the ocean (see figure). The height of the person's eyes above the water is h = 1.9 m, and the radius of the Earth is R = 6.38 x 106 m. (a) How far is it to the horizon? In other words, what is the distance d ...
*Tuesday, January 19, 2016 by DEMETRIUS*

**physics**

a car is uniformly decelerated from 90km/hr in a time of 10 sec calculate the 2 acceleration
*Tuesday, January 19, 2016 by wonde*

**PHYSICS**

How can tachyons increase in speed by decreasing in energy
*Tuesday, January 19, 2016 by TRYSYENS*

**Physics**

A solid is completely submerged in a particular liquid and floats at a constant level.when the temperature of the liquid in the solid is raised, the liquid expands more than the solid. will this make the solid rise upward remain floating or sink explained
*Tuesday, January 19, 2016 by Christine*

**Physics **

An automobile with a mass of 1450 kg is parked on a moving flatbed railcar; the flatbed is 1.50 m above the ground. The railcar has a mass of 38500 kg and is moving to the right at a constant speed of 8.70 m/s on a frictionless rail. The automobile them accelerates to the left...
*Tuesday, January 19, 2016 by Khalid*

**Physics please help**

The gun, mount, and train car of a railway had a total mass of 1.22 x 10^6 kg. The gun fired a projectile that was 80 cm in diameter and weighed 7502 kg. In the firing, the gun has been elevated 20 degrees above the horizontal. If the railway gun at rest before firing and ...
*Tuesday, January 19, 2016 by Khalid*

**physics**

an ideal gas occupies a volume of 22.4litres at stp while absorbing 2.53KJ of heat from the surrounding the gas expands isobarically to 32.4 litres. What is the change in internal energy
*Tuesday, January 19, 2016 by jay*

**Physics (Feilds)**

Show that the gravitational potential at the surface of the Earth is -64 MJ kg-1, given the surface gravitational feild strength is 9.8 N kg-1 and the mean radius of the Earth is 6400 km.
*Tuesday, January 19, 2016 by Sarah*

**Science(physics)**

A spring 20cm long is stretched to 25cm by a load of 50N. What will be its length when stretched by 100N assuming that the elastic limit is not reached? I want the answer abd solving to this question and also the formula for young modulus of elasticity
*Tuesday, January 19, 2016 by Rachel*

**Algebra**

Math club purchased 3 adult tickets and 12 student tickets for $262.50. Physics club purchased 4 adult tickets and 8 student tickets for $230.00. How much do the adult and student tickets cost?
*Tuesday, January 19, 2016 by bill*

**physics **

Mary weighs 519 N and she walks down a flight of stairs to a level 3.4 m below her starting point. What is the change in Mary’s potential energy? Answer in units of J.
*Tuesday, January 19, 2016 by Issa*

**Physics**

1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] and the second stone moves away at a velocity of 1.25 m/s [N44oE], what was the initial velocity of the ...
*Monday, January 18, 2016 by Ryback*

**physics**

A stick is a connection of two same -diameter metal rod 5 cm , and a length of both stick is 0,6m. The thermal conductivity of the first rod 92 cal /s.m.°C , and the second stick 50 cal / s.m.°C . The temperature at the free end of the first rod 100 °C and the free...
*Monday, January 18, 2016 by Anonymous*

**physics **

Bailey is on the tenth frame of her recent bowling competition and she needs to pick up the last pin for a spare and the first place trophy. She rolls the 7.05-kg ball down the lane and it hits the 1.53-kg pin head on. the ball was moving at 8.24 m/s before the collision. The ...
*Monday, January 18, 2016 by bryce *

**Physics**

the distance of a planet from its sun is 19000000 miles. if there are 29400000 seconds in one orbit, find the speed of the planet in its orbit about the sun. (assume a circular orbit)
*Monday, January 18, 2016 by S*

**physics**

The energy of the em waves is of the order of 15 kev.to which part of the spectrum does it belong?
*Monday, January 18, 2016 by Princy*

**Physics **

Also got lost on this question: A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235m below. If the plane is traveling horizontally with a speed of 250 km/h (69.4 m/s), (a) how far in advance of the recipients (horizontal distance) must the ...
*Monday, January 18, 2016 by LINA*

**Physics**

I'm having trouble where to start with this question.. Any help would be helpful. A projectile is fired with an initial speed of 75.2 m/s at an angle of 34.5° above the horizontal on a long flat firing range. Determine (a) the maximum height reached by the projectile...
*Monday, January 18, 2016 by LINA*

**Physics **

I did the problem but i'm confused on what to do next: 1.A hunter aims directly at a target (on the same level) 120m away. (a) If the bullet leaves the gun at a speed of 250m/s, by how much will it miss the target? (b) At what angle should the gun be aimed so the target ...
*Monday, January 18, 2016 by LINA*

**Physics**

How many coulombs pass through a wire that carries a current of 3.2 A for 5.0 h? I=Q/t Q=It Q=3.2*5*60 Q=960 I am told this is not the correct answer.
*Monday, January 18, 2016 by R*

**Physics**

A body moving with a velocity at 10 ms collides with a stationery box of mass 100 kg.I f the body has a mass of 50 kg and the two move together after collision.Find their final velocity?
*Monday, January 18, 2016 by Isaac*

**Physics**

Vehicle A is 819.017 feet behind vehicle B. Vehicle A is traveling at 93.602fps and vehicle B is traveling at 44fps. How long until vehicle A catches vehicle B?
*Monday, January 18, 2016 by Wayne*

**ap physics **

Mass m1 on the frictionless table of the figure below is connected by a string through a hole in the table to a hanging mass m2. With what speed must m1 rotate in a circle of radius r if m2 is to remain hanging at rest? (Use any variable or symbol stated above along with the ...
*Monday, January 18, 2016 by ian*

**AP Physics**

A 25 degree incline sits on a 1.2 meter high table. a ball rolls off the incline with a velocity of 4 m/s. how far does the ball travel across the room before reaching the floor?
*Monday, January 18, 2016 by Kat*