Saturday

January 21, 2017
**Physics**

A 2.5m long string vibrates as a 100 Hz standing wave with nodes at 1m and 1.5m from one end of the string and no points in between the two.Which harmonic is this?work out

*Thursday, November 10, 2016 by Anonymous*

**Physics**

A jet plane traveling 1890 km/h (525 m/s ) pulls out of a dive by moving in an arc of radius 5.20 km What is the plane's acceleration in g's?

*Wednesday, November 9, 2016 by Stuck*

**Physics**

Two parallel straight wires are 1 meter apart. Each wire carries a current of 2 Amperes in the same direction. What is the resultant magnetic field produced by both wires at a point: 2) 1/4 of the distance between them I don't really understand what 2 is saying to be real ...

*Wednesday, November 9, 2016 by Jo*

**Physics**

Blocks with masses of 1 kilogram, kilogram, and 3 kilogram are lined up in a row on a frictionless table. All three are pushed forward by a 12 Newton Force applied to the 1 kilogram block. Draw a free body diagram of all 3 blocks. How much force does the 2 kilogram block ...

*Wednesday, November 9, 2016 by Anonymous*

**Physics**

A brave but inadequate rugby player is being pushed backward by an opposing player who was exerting a force of 800 Newtons on him. The mass of the losing player plus the equipment is 90 kilograms and he is accelerating at 1.2 meters per second backward. How would I sketch the ...

*Wednesday, November 9, 2016 by Anonymous*

**Physics**

A raft is made of 15 logs lashed together. Each is 30.0 cm in diameter and has a length of 7.00 m. How many people (whole number) can the raft hold before they start getting their feet wet, assuming the average person has a mass of 66.0 kg? Do not neglect the weight of the ...

*Wednesday, November 9, 2016 by Kayla*

**Physics**

A 1500 kilogram car skids to a hold on a wet road where the coefficient of kinetic friction is 0.5. How fast was the car traveling if it leaves 65 meter long skid marks?

*Wednesday, November 9, 2016 by Anonymous*

**Physics**

For the object in the preceding problem, what magnitude torque is necessary to give the object an angular acceleration of 1.5 rad/s^2 a) along the x-axis? b) along the y-axis? c) along the z-axis (perpendicular to the page, passing through the origin)? Help please! Use the ...

*Wednesday, November 9, 2016 by Anonymous*

**Physics**

A clock has a second hand which rubs against the inside of the glass cover. If the frictional force between the glass cover and the tip of the hand is 0.0020 N and the length of the hand is 8 cm, what minimum torque must be supplied to the hand by the clock mechanism if the ...

*Wednesday, November 9, 2016 by Anonymous*

**Physics**

A certain number of identical resistors are connected in series and their total resistance is measured. When the resistors are disconnected and re-connected in parallel, their total resistance drops to one-percent of the value measured when they were connected in series. How ...

*Wednesday, November 9, 2016 by Tim*

**physics**

Blood flows in an aorta of radius 4.12mm at 35.0cm/s. Calculate the volume flow rate. Although the cross-sectional area of a capillary is much smaller than that of the aorta, there are many capillaries, so their total cross-sectional area is much larger. If all the blood from ...

*Wednesday, November 9, 2016 by taylor*

**physics**

a car with a mass of 1.50 x 10^3 kg starts from rest and acceleration to a speed of 18.0 m/s in 12.0 s. Assume that the force of resistance remains constant at 400.0 N during this time. What is the average power developed by the cars engine

*Wednesday, November 9, 2016 by sharon*

**Physics**

Water at a pressure of 4.20 atm at street level flows into an office building at a speed of 0.65 m/s through a pipe 6.60 cm in diameter. The pipes taper down to 2.20 cm in diameter by the top floor, 28.0 m above. Calculate the water pressure in such a pipe on the top floor in ...

*Wednesday, November 9, 2016 by Trish*

**Physics**

A tennis ball is thrown with a velocity of 30m/s at an angle of 60^ of the horizontal calculate the time,m/s,and the range

*Wednesday, November 9, 2016 by Samuel*

**physics!!!!**

There is a two member dog sled team pulling with all their strength in the middle of a snow storm. Dog A is pulling with a force of 178 N at 15Ã°Ââ€;˜Å“ and Dog B is pulling with 225 N at Ã¢Ë†â...

*Wednesday, November 9, 2016 by Jackie*

**Physics**

A quarterback throws a spiral to a receiver that is 40m away. The football has a spin of 14 rev/s and went through 58 revolutions before being caught. if the ball is caught at the same height it was thrown at, at what velocity and at what angle should the quarterback throw the...

*Wednesday, November 9, 2016 by Jack*

**Physics**

two charges of 40 microc and -20 micro c are placed at a certain distance apart. they are touched and kept at the same distance.the ratio of their initial to the final force between them is

*Wednesday, November 9, 2016 by Xyz*

**physics 101**

You drive your car at a speed 40km/h for 1 hour, then slow down to 30km/h for the next 20km. How far did you drive, and what was your average speed?

*Wednesday, November 9, 2016 by Nuri*

**Physics**

A bullet fired in a horizontal direction with muzzle velocity 300m/s. In the absence of air resistance, a) how far will it have dropped in travelling a distance of 20m. b) how far will it have dropped in one second

*Wednesday, November 9, 2016 by Mokut*

**Physics**

Hooke's law states that the distance, d, a string is stretched varies directly with the force, F, applied to the spring. If a force of 12 pounds stretches a spring 3 inches, how far will the spring stretch when a force of 30 pounds is applied?

*Wednesday, November 9, 2016 by Rizza Mae*

**physics**

A 400-gram package lying on a horizontal surface is attached to a horizontal string which passes over a smooth pulley. When a mass of 200 grams is attached to the other end of the string, the package is on the point of moving. Find the coefficient of friction.

*Wednesday, November 9, 2016 by Rheabelle*

**Physics**

How much energy W needed to compress a spring from 15 cm to 10 cm if the constant of the spring is 150 N/m.

*Wednesday, November 9, 2016 by Rizza Mae*

**physics**

A 5kg box on a horizontal table is pushed by a horizontal force of 15N. If the coefficient of friction is 0.4, will the box move? what is the smallest force that could make the box slide along the table?

*Wednesday, November 9, 2016 by Rheabelle*

**Physics: Centre of Mass**

Three masses of 4.0 kg, 5.0 kg and 7.0 kg are located on a line at positions +4.0, +8.0, and -5.0 in meters from the origin, respectively. Where is the center of mass of these three masses? With respect to the origin as x = 0, I calculated the center of mass to be: (4.0 kg)*(4...

*Tuesday, November 8, 2016 by Bob*

**PHYSICS**

A 15 M LENGTH OF HOSE IS WOUND AROUND A REEL WHICH IS INITIALLY AT REST. THE MOMENT OF INERTIA OF THE REEL OF 0.44KGM^2 AND ITS RADIUS IS 0.160M. WHEN THE REEL IS TURNING FRICTION AT THE AXLE EXERTS A TORQUE OF MAGNITUDE 3.40NM ON THE REEL. IF THE HOSE IS PULLED SO THAT THE ...

*Tuesday, November 8, 2016 by kassy*

**PHYSICS**

A PERSON LOWERS A BUCKET INTO A WELL BY TURNING THE HAND CRANK. THE CRANK HANDLE MOVES WITH A CONSTANT TANGENTIAL SPEED OF 120M/S ON ITS CIRCULAR PATH. THE ROPE HOLDING THE BUCKET UNWINDS WITH OUT SLIPPING ON THE BARREL OF THE CRANK. FIND THE LINEAR SPEED WITH WHICH THE BUCKET...

*Tuesday, November 8, 2016 by kassy*

**physics**

a 5kg box is pulled along the floor by a rope that makes a 25 degree angle with the horizontal. the coefficient of kinetic friction between the box and the floor is 0.25. If the box accelerates at a rate of 1.5 m/s squared, what must be the tension of the rope?

*Tuesday, November 8, 2016 by brother martin*

**PHYSICS**

AN AUTOMOBILE TIRE HAS A RADIUS OF 0.330M AND ITS CENTER MOVES FORWARD WITH A LINEAR SPEED OF V= 15.0M/S. a) DETERMINE THE ANGULAR SPEED OF THE WHEEL. B) RELATIVE TO THE AXLE, WHAT IS THE TANGENTIAL SPEED OF A POINT LOCATED 0.175M FROM THE AXLE?

*Tuesday, November 8, 2016 by kassy*

**physics**

A MAN HOLDS A 178 N BALL IN HIS HAND, WITH THE FOREARM HORIZONTAL. HE CAN SUPPORT HE BALL IN THIS POSITION BECAUSE OF THE FLEXOR MUSCLE FORCE, M, WHICH IS APPLIED PERPENDICULAR TO THE FOREARM. THE FOREARM WEIGHS 22 N AND HAS A CENTER GRAVITY. FIND THE MAGNITUDE OF M AND B)THE ...

*Tuesday, November 8, 2016 by kassy*

**Physics**

A solid sphere and a thin walled spherical she'll, both with a radius R, are set up to roll down a ramp and through a vertical loop of radius r. From what minimum height, h, does each sphere need to be released in order to make it around the loop? If the loop has a radius ...

*Tuesday, November 8, 2016 by Kassy*

**Physics**

How long will it take a motor with an output power of 4000 W to lift a 250 kg container vertically upwards 25 m? how would u do the calculation?

*Tuesday, November 8, 2016 by Stacy*

**Physics**

An object initially rotating at an angular speed of 1.6 rad/sec turns through 30 revolutions during the time it experienced an angular acceleration of 0.32 rad/s^2 a) For how much time did the acceleration last? b) What was the final angular speed? Help please. Use the ...

*Tuesday, November 8, 2016 by Anonymous*

**Conceptual Physics**

While driving down an icy road in his pickup truck, Dan slid off the road into a ditch. He and his two friends each exerted a force of 200 N on the truck for two minutes, but failed to move it. The work done by the three friends on the truck was? the answer is 3.0m/s but isn&#...

*Tuesday, November 8, 2016 by Stacy*

**Physics**

An object initially rotating at an angular speed of 1.6 rad/sec turns through 30 revolutions during the time it experienced an angular acceleration of 0.32 rad/s^2 a) For how much time did the acceleration last? b) What was the final angular speed? Help please. Use the ...

*Tuesday, November 8, 2016 by Anonymous*

**Physics**

what is the angular speed of the earth as it orbits the sun a) in radians/second? b) in degrees per day? I need help please. Use the equation and step by step to get the answer

*Tuesday, November 8, 2016 by Anonymous*

**Physics**

a softball batter hits a fly ball that is caught 3.8 seconds later, 88m from home plate. The ball is caught at the same height from which it was thrown. What was its initial velocity? What is the maximum height above its launch point that it reached?

*Tuesday, November 8, 2016 by Bill*

**physics**

A centreate block mass 25kg is placed on a wooden plant inclined at an angle 32 dergree to the horizontal calculate the force parallel to the inclined plane that would keep the block rest .If the cofficient of fricition between the block and the plane is 0.45

*Tuesday, November 8, 2016 by awoyele tobi*

**Physics**

An engine of car of power 40KW moves on a rough road wit a velocity of 50ms-1.cal.the force require to bring it to rest.

*Tuesday, November 8, 2016 by Zahraht*

**Physics**

I am trying to help my daughter with this question and don't know how to even begin it. Thank you. A 75 kg baby carriage is pushed along a level sidewalk by exerting a force of 50 N on the handle, which makes an angle of 60o with the horizontal. What is the coefficient of ...

*Tuesday, November 8, 2016 by Mom*

**physics**

a compound microscope has an eyepiece of focal length 10 c.m and an objective of focal length 4c.m.the magnification of an object is placed at a distance of 5 c.m from the objective so that the final image is formed at the distance of distinct vision (20 c.m) is

*Tuesday, November 8, 2016 by Asfand*

**Physics**

The cylindrical driving bell whose length is 1.5m is lowered to the bottom of a tank.assume the atmospheric pressure at the surface as equivalent to 1000 cm of water and the temperature as constant

*Tuesday, November 8, 2016 by Swami*

**Physics**

A 24.5-kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 87.5 N and is directed at an angle of 30.0Â° above the horizontal. Determine the coefficient of kinetic friction. Âµk=

*Monday, November 7, 2016 by Ashley*

**Physics**

Determine the radius R of an object undergoing circular motion at a velocity of 54 m/s with an acceleration of 90 m/s^2

*Monday, November 7, 2016 by Student*

**Physics**

I don't know how to solve this problem. In it, I am given the mass (4 kg), acceleration (0), velocity (20 m/s), coefficient of friction (.2), and the applied force (10 N downwards with an angle of 30 degrees above the horizontal). I must find the displacement of the object...

*Monday, November 7, 2016 by Corinne*

**Physics**

Calculate the velocity of an object moving around a 32m circle in a period of 11s. Calculate the acceleration.

*Monday, November 7, 2016 by Student*

**Physics**

a 294 kg crate is released from rest and hits the ground 1.18 m below after 4.10 s. What is the mass of the crate to the left of the pulley? Assume the rope and pulley are massless.

*Monday, November 7, 2016 by HELP ME!!!!!!*

**physics**

An ideal gas has the following initial conditions: Vi = 490 cm3, Pi = 5 atm, and Ti = 100Â°C. What is its final temperature if the pressure is reduced to 1 atm and the volume expands to 1000 cm3?

*Monday, November 7, 2016 by Math*

**Physics**

A 3 kg book is resting on a table. What force does the table exert on the book?

*Monday, November 7, 2016 by Nathaniel*

**Physics**

A 45kg skier is sliding down a 37 degree ski slope starting from rest. She crossed the 25m in 5.0s. Ignoring air resistance, Find all the forces on the skier.

*Monday, November 7, 2016 by John*

**Physics**

The large disk-shaped flywheel illustrated below has a radius R of 0.25 m. It is made to spin by the small wheel that contacts it at its rim. The small wheel applies a constant force of 1430 N. Friction in the bearing exerts a retarding torque 22 Nm on the large wheel. If the ...

*Monday, November 7, 2016 by Beth*

**Physics**

Suppose your car was mired deeply in the mud and you wanted to use the method illustrated in the figure to pull it out. (a) What force in newtons would you have to exert perpendicular to the center of a rope to produce a force of 10,000 N on the car if the angle is 1.80Â...

*Monday, November 7, 2016 by Sara*

**physics**

There are two crates are sliding down a ramp. If the crate at the top has a mass of 11.5 kg and friction is 0.20. The other has a mass of 23 kg and friction is 0.10, what is the tension in the string? Assume the string is massless.

*Monday, November 7, 2016 by 2FUN*

**physics**

motion

*Monday, November 7, 2016 by abdulkadir*

**Physics**

An object initially rotating at an angular speed of 1.6 rad/sec turns through 30 revolutions during the time it experienced an angular acceleration of 0.32 rad/s^2. a) For how much time did the acceleration last? b) What was the final angular speed?

*Monday, November 7, 2016 by Anonymous*

**Physics**

What is the angular speed of the earth as it orbits the sun a) in radians/second? b) in degrees per day?

*Monday, November 7, 2016 by Anonymous*

**Physics**

What is the reaction of the earth pulling down on a pen that is lying on a table

*Monday, November 7, 2016 by Mark*

**Physics**

Three liters of nitrogen combine with 9 L of hydrogen to form 6 L of ammonia. If the molecules of nitrogen and hydrogen have two atoms each, how many atoms of hydrogen and nitrogen are there in one molecule of ammonia? ____ atoms of hydrogen ____ atoms of nitrogen

*Monday, November 7, 2016 by Katelyn*

**Physics**

A mass-spring system undergoes simple harmonic motion with amplitude A.Does the total energy of the system change if the mass doubled but the amplitude is unchanged? Does the kinetic and potential energies depends on the mass? Explain.

*Monday, November 7, 2016 by Anyam*

**Physics**

The distance between two telephone poles is 50.0 m. When a 0.500-kg bird lands on the telephone wire midway between the poles, the wire sags 0.14 m. Ignore the weight of the wire. 1)How much tension does the bird produce in the wire? (Express your answer to two significant ...

*Monday, November 7, 2016 by Buttermilk Biscuit Jr.*

**Physics**

A certain number of identical resistors are connected in series and their total resistance is measured. When the resistors are disconnected and re-connected in parallel, their total resistance drops to one-percent of the value measured when they were connected in series. How ...

*Monday, November 7, 2016 by Charles*

**physics**

Two crates rest on top of one another.There is a crate of mass 4.62 kg on top of another crate of mass 2.19 kg. The coefficient of friction between the lower crate and the floor is Î¼k = 0.440 and the coefficient of static friction between the two crates is Î...

*Monday, November 7, 2016 by 2FUN*

**Physics**

A car uniformly accelerates from 0 to 27.0 m/s. A 68.0-kg passenger experiences a horizontal force of 390.0 N. 1)How much time does it take for the car to reach 27.0 m/s? (Express your answer to three significant figures.) My teacher didn't explain how we could ever find ...

*Monday, November 7, 2016 by Casey*

**Physics**

Suppose that instead of our sun, our star were a giant star such as Betelgeuse. The mass of Betelgeuse is estimated to be about 20 times that of our sun. With earth in the same orbit? With its same mass, how long would our year be in earth days if we orbited Betelgeuse?

*Monday, November 7, 2016 by Matt*

**Physics**

A) the earth year is 365.25 days long. How long would our year be if earth followed the same orbit, but was only the mass of Mars? Answer this in earth days. B) How long would our year be if earth were the same mass, but had the orbital distance of mercury Answer this in earth...

*Monday, November 7, 2016 by Matt*

**Physics**

At a height of 500km above earth, a satellite will orbit the earth once every 95 minutes. Find the mass of the earth based on this idea. B) How far above earth's surface would a satellite need to orbit so that it revolves at exactly the same rate as the earth's rotation?

*Monday, November 7, 2016 by Matt*

**physics (CHECK MY WORK PLEASE ASAP)**

An object of mass 1.00kg is moving over a horizontal circular path of radius 2.00m, with a speed of 3.00ms^-1. Determine: (a) its centripetal acceleration (b) its kinetic energy (c) its period (d) its angular velocity a: 3.00^2/2.00 = 4.5 ms^-1 b: 0.5 Ã— 1.00 &...

*Monday, November 7, 2016 by Stevie*

**Physics**

Two cars approach along icy streets which meet at a right angle to one another. The cars collide and stick together. One car has a mass of 1200 kg and had a speed of 30 km/h in the +x direction before the collision. The second car has a mass of 1500 kg and was traveling in the...

*Sunday, November 6, 2016 by Anonymous*

**Physics**

A particle accelerates from rest at a constant rate for some time and attains a velocity of 8 meter per second. Afterwards it decelerates with the consent rate and comes to rest. If the total time taken is 4 second then what is the total distance covered by the particle?

*Sunday, November 6, 2016 by Priyanka*

**physics**

A box slides down a frictionless 35 degree incline. Determine its acceleration. If the incline is 10.0 m long and the box starts from rest, how much time does it take to get to the bottom?

*Sunday, November 6, 2016 by rick*

**Physics**

A 10 kg object (m1) initially moving to the right at 20 m/s makes a totally elastic head on collision with a 15 kg object (m2) which was initially moving to the left at 5 m/s. Find the final velocities of each object. HINT: Treat this as a one-dimensional problem. Help ASAP ...

*Sunday, November 6, 2016 by Anonymous*

**Physics**

Two cars approach along icy streets which meet at a right angle to one another. The cars collide and stick together. One car has a mass of 1200 kg and had a speed of 30 km/h in the +x direction before the collision. The second car has a mass of 1500 kg and was traveling in the...

*Sunday, November 6, 2016 by Anonymous*

**Physics**

Three carts of masses 4kg, 10 kg, and 3 kg move on a frictionless horizontal surface with initial speeds of 5 m/s, 3 m/s, and 4 m/s. If the carts all stick together after the collisions, what will be the final velocity of the combined mass? Help ASAP please. Step by step to ...

*Sunday, November 6, 2016 by Anonymous*

**Physics**

Show that the kinetic energy of an object can be written in terms of the momentum as KE = p2/2m. Help ASAP please. Step by step to get the answer

*Sunday, November 6, 2016 by Anonymous*

**Physics**

a) What is the ratio of the momentum of a 3kg mass moving at 3 m/s to that of a 2 kg mass moving at 4 m/s? b) What is the ratio of the respective kinetic energies? Help ASAP please!! Step by step to get the answers

*Sunday, November 6, 2016 by Anonymous*

**Physics**

One afternoon, a couple walks three-fourth of the way around a circular lake, the radius of which is 1.45km. They start at the south side of the lake and head due east at the beginning of their walk. (a) What is the distance they travel? (b) What are the magnitude and ...

*Sunday, November 6, 2016 by Marene*

**Physics**

A boat crosses a river 1.5km wide in 15mins. If the river flows at 2km/hr calculate the velocity of the boat.

*Sunday, November 6, 2016 by Erwin*

**physics**

An object of mass 1.00kg is moving over a horizontal circular path of radius 2.00m, with a speed of 3.00ms^-1. Determine: (a) its centripetal acceleration (b) its kinetic energy (c) its period (d) its angular velocity

*Sunday, November 6, 2016 by Stevie*

**Physics**

Two hockey pucks of equal mass are involved in a perfectly elastic, glancing collision, as shown in the figure below. The orange puck is initially moving to the right at voi = 3.95 m/s, when it strikes the initially stationary blue puck, and moves off in a direction that makes...

*Sunday, November 6, 2016 by Jessica*

**Physics FRICTION FORCE AND N-2ND LAW**

A balloon has a weight of 1250 N, and the lifting force on it is 3525N. If the air resistance is 15N, what is the acceleration of the balloon? (Notice fg=mg) 3525-15=3515 3515/1250= 2.81 ???? A pulling force on a case is 1653 N while the friction force is 765 N on the case. If...

*Sunday, November 6, 2016 by Physics*

**physics**

A mango fruit drops from the top of it's tree which is 40 m. How long does it takes to reach the ground

*Sunday, November 6, 2016 by miracle*

**Physics PROJECTILE AND CIRCULAR MOTION**

1.13g plastic stopper is attached to a 0.93-m string. The stopper is swung in a horizontal circle, making one revolution in 1.18s(period T). Find the tension force(equivalent to the centripetal force)exerted by the string on the stopper? (V=2(pie)r/T)? 2. A football is thrown ...

*Sunday, November 6, 2016 by Physics*

**Physics**

A child standing on a platform holds a rope taut at an angle Î¸ to the vertical. The child swings from the platform starting from rest. When the child swings through the lowest position, the tension in the rope is 1.9 times the child's weight. Determine the ...

*Sunday, November 6, 2016 by Ven Man*

**Physics**

Calculate the force of earths Gravity on a 2.00 earth radii above the earth surface if it's mass is 1850kg.

*Sunday, November 6, 2016 by Stuck*

**AP physics**

Astronauts who spend long periods in outer space could be adversely affected by weightlessness. One way to stimulate gravity is to shape the spaceship like a cylindrical shell that walking on the inside surface. Explain how this simulates gravity. Consider (a) how object fall...

*Sunday, November 6, 2016 by Susana*

**physics**

An ideal gas has the following initial conditions: Vi = 490 cm3, Pi = 5 atm, and Ti = 100Â°C. What is its final temperature if the pressure is reduced to 1 atm and the volume expands to 1000 cm3? ______ Â°C

*Sunday, November 6, 2016 by Katelyn*

**physics**

Three liters of nitrogen combine with 9 L of hydrogen to form 6 L of ammonia. If the molecules of nitrogen and hydrogen have two atoms each, how many atoms of hydrogen and nitrogen are there in one molecule of ammonia? ____ atoms of hydrogen ____ atoms of nitrogen

*Sunday, November 6, 2016 by Katelyn*

**physics**

1. A bullet of mass 10 g is fired vertically upward and it reaches to the highest point in 10 seconds. Which of the following figures is nearer to its maximum height above the firing position? A) 10 m B) 22 m C) 30 m D) 42 m E) None of the above

*Sunday, November 6, 2016 by Ghulam muhammad*

**physics**

A bomber drops a bomb from an aircraft flying at 2000Km/h with an altitude of 7 Km. The speed at which the bomb will strike the earth would be. a) Greater than 2000Km/h b) Less than 2000 Km/h c) Equal to 2000 Km/h d) Can not compare with the given data

*Sunday, November 6, 2016 by Ghulam muhammad*

**physics**

A duck is swimming across a river. The duck can swim at maximum speed of 2m\s in still water. If the duck i swimming as hard as possible straight across a river that running at 4m\s, what is the duck's overall speed, relative to the goose sitting on the river bank?

*Sunday, November 6, 2016 by atiyya*

**physics**

A boat is heading directly North acroos a river at 5km\h. The river is flowing east at 3km\h. a) what is the actual velocity of the boat? b) how far down stream does it land if the trip takes 0.5 hrs. c) how wide is the river?

*Sunday, November 6, 2016 by atiyya*

**physics**

A force of 300N lifts a mass of 120kg with help of lever whose length is 2.4 m.The distance between fulcrum and mass is a) 40cm b) 48cm c) 80cm d) 171cm

*Sunday, November 6, 2016 by Ghulam muhammad*

**physics**

a body is projected with velocity v1 from a point a at the same time another body is projected vertically upwards with velocity v2 the point b lies vertically below the height the point for both the bodies to collide 2/v should be

*Sunday, November 6, 2016 by teja*

**AP physics**

The earth moves faster in its orbits around the sun in January, or in July? Explain [Note: this is not much of a factor in producing seasons - the main factor is the tilt of the earths axis relative to the plane of its orbit.]

*Sunday, November 6, 2016 by Stuck*

**AP physics**

The sun is below us at a magnitude of nearly a line with the earth center. Are we then Heavier at midnight due to the sun's gravitational force on us, than we are at noon? Explain

*Sunday, November 6, 2016 by Stuck*

**Physics**

Why is more fuel required for spacecraft to travel from the earth to the moon than to return from the moon to the earth?

*Sunday, November 6, 2016 by Stuck*

**Physics**

Does an apple exert a gravitational force on the earth? If so, how large a force? Consider an apple (a) Attached to a tree and (b) falling.

*Sunday, November 6, 2016 by Stuck*

**AP physics**

Astronauts who spend long periods in outer space could be adversely affected by weightlessness. One way to stimulate gravity is to shape the spaceship like a cylindrical shell that walking on the inside surface. Explain how this simulates gravity. Consider (a) how object fall...

*Sunday, November 6, 2016 by Stuck*

**Physics**

A ball A having a speed of 44.0 ms-1 collides with another ball, B, of the same mass which is initially at rest. After the collision A is deflected, 45.0ï‚° from its initial direction and B moves off at an angle of 30.0Â° to the original direction of A...

*Sunday, November 6, 2016 by Van*

**Physics**

A ball A having a speed of 44.0 ms-1 collides with another ball, B, of the same mass which is initially at rest. After the collision A is deflected, 45.0ï‚° from its initial direction and B moves off at an angle of 30.0Â° to the original direction of A...

*Saturday, November 5, 2016 by Van*

**Physics**

A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.4 m below the water surface.How much force must a boy apply to the hole with his thumb to stop the leak? Could he do it?

*Saturday, November 5, 2016 by Ayla*