Monday
January 16, 2017

# Homework Help: Science: Physics

## Recent Homework Questions About Physics

Harry, who has a mass of 54 kg, has just gotten a flybar pogo stick and is standing on top of a small wall. He pushes off the wall with a velocity of 1.7 m/s, gets on the stick and lands. The stick has a spring constant of 3.5 x 104 N/m and he compresses it by 20.0 cm when he ...
Thursday, November 17, 2016 by Michelle

Physics
You are lawn bowling and bowl a ball with a speed of 5.00 m/s. Unfortunately, your ball hits a large rock of mass 400 g, resulting in a perfectly elastic collision. If the final velocity of the ball after the collision is -2.93 m/s, what must the mass of the ball be
Wednesday, November 16, 2016 by Physics Lover

Physics
A 21700 kg train is reaching the end of the line. In order to slow down, the front of the train snags a cable that is attached to a spring. If the spring has a spring constant of 73400 N/m and the train's initial speed is 53.0 m/s, how much will the spring stretch to stop ...
Wednesday, November 16, 2016 by Physics Lover

Physics
A meter stick whose mass is 0.200 kg is supported at the zero cm mark by a knife edge and a force F at the 100 cm point. A mass of 700 grams is attached to the stick at 40 cm mark. Find the magnitude of N and F in Newton's.
Wednesday, November 16, 2016 by Lauren

Physics
You throw a 238 g baseball straight up from a height of 1.73 m and it reaches a height of 13.2 m. Using conservation of energy, what minimum initial speed is needed to accomplish this?
Wednesday, November 16, 2016 by Physics Lover

physics
A 2.0 g bullet is shot with an initial velocity of 200.0 m/s into a board (I = 12.0 kg m2). The board is held still by a frictionless pivot a third away from its bottom end, as shown below. Assume that you can treat the board as a uniform rod. 1. What is the initial angular ...
Wednesday, November 16, 2016 by anna

Physics
A 4.0 g bullet is shot with an initial velocity of 300.0 m/s into a board (I = 19.0 kg m2). The board is held still by a frictionless pivot a third away from its bottom end, as shown below. Assume that you can treat the board as a uniform rod. 1) What is the initial angular ...
Wednesday, November 16, 2016 by Sara S

Megan and Catrina are at a playground swing set. Catrina pulls Megan back so that the 2.5 m long chain makes a 35ï‚° angle with the vertical. She pushes her with a speed of 6.5 m/s and Megan begins to swing forward. a) What is Meganâ€™s fastest ...
Wednesday, November 16, 2016 by Alexis

applied physics
An object is thrown vertically up ward from the ground with initial velocity 1960cm/s Neglecting air resistance, find the maximum height reached and the total time taken to return to the straight point ,/using first order differential equations/
Wednesday, November 16, 2016 by Ermiyas Abas

Physics
a 30.0 g particle is released from rest at x = 5 J. What is the speed of the particle at x = 0 J?
Wednesday, November 16, 2016 by Speed Ratio

Physics
What is the speed ratio (vA/vB) if particle A has 6 times the kinetic energy and half the mass of particle B? 3.46 1.73 2.45 0.289
Wednesday, November 16, 2016 by Speed Ratio

Physics
One end of a spring is attached to a wall and Jamie pulls on the other end of the spring with a force of 200 N, stretching the spring by 11.5 cm. If Jason takes the end of the spring off of the wall and they both pull the spring with a force of 200 N, how far will the spring ...
Wednesday, November 16, 2016 by Physics Lover

physics
The figure shows an overhead view of a 3.00-kg plastic rod of length 1.20 m on a table. One end of the rod is attached to the table, and the rod is free to pivot about this point without friction. A disk of mass 37.0 g slides toward the opposite end of the rod with an initial ...
Wednesday, November 16, 2016 by Amy

Physics
compute for the power while pushing an object by a 200N force making 18 degrees above the horizontal covering a distance of 7.5m in 0.5 minute?
Wednesday, November 16, 2016 by Anonymous

Physics
Francesca dangles her watch from a thin piece of string while the jetliner she is in accelerates for takeoff, which takes about 11 s . Tap image to zoom . Part A Estimate the takeoff speed of the aircraft if the string makes an angle of 25âˆ˜ with respect to ...
Wednesday, November 16, 2016 by Destani

Physics
Air conditioners sold in the United States are given a seasonal energy-efficiency ratio (SEER) rating that consumers can use to compare different models. A SEER rating is the ratio of heat pumped to energy input, similar to a COP but using English units, so a higher SEER ...
Wednesday, November 16, 2016 by Morgyn

Physics
The record time for a Tour de France cyclist to ascend the famed 1100-m-high Alpe d'Huez was 37.5 min, set by Marco Pantani in 1997. Pantani and his bike had a mass of 65 kg. Assume the body works with 25 % efficiency. A)How many Calories did he expend during this climb? B...
Wednesday, November 16, 2016 by Morgyn

Physics
A ceiling fan draws a current of 0.625 A and has a voltage of 120 V. The resistance of the ceiling fan, to the nearest tenth?
Wednesday, November 16, 2016 by Vivian

physics
A system consists of a 0.130-kg chunk of ice floating in 1.12 kg of water, all at 0 âˆ˜C. Part A How much thermal energy must be added to the system to convert it to 1.25 kg of water at 15.0 âˆ˜C?
Wednesday, November 16, 2016 by ......

Physics
A spring gun shoots out a plastic ball at speed v0. If the ball's speed is increased by a factor of 5, what distance must the spring have been compressed?
Wednesday, November 16, 2016 by First Name

Physics
A rectangular object has a width of 40 meters, height of 15 meters, and length of 2 meters. It floats consistently when 3 meters of its height is below the surface of the water. 1. Find the volume of the displaced water. - Is this the same as the volume of the object?
Wednesday, November 16, 2016 by Anonymous

Physics
A roller-coaster car rolls down a track, reaching a speed of v0 at the bottom. If the height of the track is increased by a factor of 2.00, assuming the track is frictionless, by what factor will the speed at the bottom increase?
Wednesday, November 16, 2016 by ._.

physics
One end of a spring is attached to a wall and Jamie pulls on the other end of the spring with a force of 100 N, stretching the spring by 19.5 cm. If Jason takes the end of the spring off of the wall and they both pull the spring with a force of 100 N, how far will the spring ...
Wednesday, November 16, 2016 by Anonymous

Physics
a great of effort, time, and money has been spent in the quest for the so-called perpetual-motion machine, which is defined as a hypothetical machine that operates or produces useful work indefinitely and/ or a machine that produces more work or energy than it consumes. ...
Wednesday, November 16, 2016 by John

Physics
the human body is only about 25 % efficient at converting input chemical energy to useful work. where does the rest of the input chemical energy go?
Wednesday, November 16, 2016 by John

Physics
A quartz sphere is 14.0 cm in diameter. What will be its change in volume if its temperature is increased by 305 Â°F? (the coefficient of volume expansion of quartz is (1.50 Ã— 10^-6) Â°C-1) Answer in cm^3 I tried this twice and got 0.657 cm^3 ...
Wednesday, November 16, 2016 by Kayla

physics
a ball moving witha speed of 9m/s sttrikes an identical ball such that after collison ,the direction of each ball makes an angle of 30 with original line of motion. if K1 and K2 are the kinetic energies before and after collision the A) K1< K2 b) K1> K2 c)K1=K2
Wednesday, November 16, 2016 by Aabha

Physics
The popular Super Soaker water guns are powered by compressed air (provided by a hand pump used by the operator.) A certain model has a cylindrical reservoir (where the water is held) 8.00 cm in diameter and a barrel (where the water leaves the gun) 1.00 cm in diameter. If ...
Wednesday, November 16, 2016 by Ernan

Physics
A cylindrical log of uniform density and radius 20.0 cm floats so that the vertical distance from the water line to the top of the log is 8.00 cm. What is the density of the log? (Hint: draw a good picture of the circular end of the log.)
Wednesday, November 16, 2016 by Ernan

Physics
A mass m at the end of a spring oscillates with a frequency of 0.83 Hz . When an additional 770 g mass is added to m, the frequency is 0.65 Hz . Part A What is the value of m? Express your answer to two significant figures and include the appropriate units. Milligrams --> Kg
Tuesday, November 15, 2016 by Ashley

Physics
You exert a force of 26 N on the head of a thumbtack. the head of the thumbtack has a radius of 7 mm.? What is the pressure on your thumb? -------- atm
Tuesday, November 15, 2016 by Katelyn

Physics
A car is proceeding at a speed of 14.0 m/s when it collides with a stationary car in front. During the collision, the fist car moves a distance of 0.350 m as it comes to a stop. The driver is wearing her seat belt, so she remains in her seat during the collision. The driver&...
Tuesday, November 15, 2016 by Nick

Physics
Robert constructs the apparatus shown and slides a block down a slope that is without friction until the block reaches the section, L, of length 1.85 m, which begins at height h2 = 2.0 m on a ramp of angle 30.0Â°. In that section, the coefficient of kinetic friction ...
Tuesday, November 15, 2016 by Alexis

physics
Acceleration of a Mass in a Pulley System Block 1 of mass m1 slides on a frictionless plane inclined at angle Î¸ with respect to the horizontal. One end of a massless inextensible string is attached to block 1. The string is wound around a frictionless movable ...
Tuesday, November 15, 2016 by simon

PHYSICS
A 6.53-kg block initially at rest is pulled to the right along a horizontal surface by a constant force of 125 N applied at an angle Î¸ above the horizontal. The coefficient of kinetic friction between the block and the horizontal surface is 0.150. At what angle &...
Tuesday, November 15, 2016 by ROMAN

physics
A basketball explodes into three separate pieces. Two pieces of equal mass shoot off at 20.3 m/s, one travelling to the south and one to the west, perpendicular to each other. The third piece has a mass 4 times the size of one of the other pieces. What is the speed of the ...
Tuesday, November 15, 2016 by HELP!!!

physics
What is the force constant of a spring which is stretched 2mm by a force of 4N
Tuesday, November 15, 2016 by amie

Physics
a transverse wave on a string has a period of 0.1 s and an amplitude of 1 cm. What is the maximum transverse acceleration at any point along the string?
Tuesday, November 15, 2016 by Mona

university physics
A 5.20 g pellet is shot horizontally from a BB gun at a speed of 29.1 m/s into a 20.8 g wooden block. The wooden block is attached to a spring and lies on a frictionless table. If the collision is inelastic and the spring constant k = 22.0 N/m, what is the maximum compression ...
Tuesday, November 15, 2016 by lily

physics
A car brakes at constant acceleration from a velocity 226m/s to 12.5m/s over a distance of 105m.find; a)How much time elapses during this time interval. b)what is the acceleration. c)if the car continued to be braked at same constant acceleration how much longer would it take ...
Tuesday, November 15, 2016 by claire

physics
A body is in equilibrum when three forces act on it.Two of the forces are F1 of magnitude 8Newtons acting due east and F2 which is 5Newtons acting 060. find the magnitude and direction of the third force.
Tuesday, November 15, 2016 by joe

Physics
In what two positions will a converging lens form images of a luminous object on a screen located 40.0cm from the object?
Tuesday, November 15, 2016 by Anonymous

PHYSICS
A force of 0.65 N is required to hold a spring extended 5.3 cm from its equilibrium position. Calculate the spring of constant of spring?
Monday, November 14, 2016 by Carmen

Physics
A 5.20 g pellet is shot horizontally from a BB gun at a speed of 29.1 m/s into a 20.8 g wooden block. The wooden block is attached to a spring and lies on a frictionless table. If the collision is inelastic and the spring constant k = 22.0 N/m, what is the maximum compression ...
Monday, November 14, 2016 by Shane

university physics
two suitcases are on a 7.89 m high ramp to passengers waiting in a baggage terminal. The top suitcase is released from rest, and it slides down the ramp and hits the second suitcase. If the suitcase at the top has a mass of 16.6 kg and the other suitcase has a mass of 33.2 kg...
Monday, November 14, 2016 by jenna

Physics
A 1340-kg car traveling east at 13.6 m/s (20 mi/h) has a head-on collision with a 1930-kg car traveling west at 20.5 m/s (30 mi/h). If the collision time is 0.10 s, what is the force needed to restrain a 68-kg person in the smaller car? In the larger car? I understand how to ...
Monday, November 14, 2016 by JJ

Physics
A person makes a quantity of iced tea by mixing 668 g of hot tea (essentially water) with an equal mass of ice at its melting point. If the initial hot tea is at a temperature of 86âˆ˜C, what are the (a) final temperature of the ice tea (in âˆ˜C...
Monday, November 14, 2016 by Gabriel

Physics
In a calorimetry experiment, an object of mass M= 9.2 kg falls through a height of 35.5 m and, by means of a mechanical linkage, rotates a paddle wheel that stirs m= 0.92 kg of water. The water is initially at 20âˆ˜C. What is the maximum possible temperature ...
Monday, November 14, 2016 by Gabriel

Physics
If you reduce the distance between two point charges to one third of the original distance, the electromagnetic force changes by a factor of:
Monday, November 14, 2016 by Maria

Physics
A sign weighing 500N is suspended at the end of a uniform 300N beam 5m in length, as shown. The beam is attatched to the wall with a hinge, and its other end is supported by a wire. What is the tension in the wire if it makes an an angle of 30o with the beam? Help please. Use ...
Monday, November 14, 2016 by Anonymous

Physics
A man stands on a freely rotating platform, as shown, holding an exercise dumbbell in each hand. With outstretched arms, his angular speed is 1.5 rad/s. After he has pulled his arms in, as shown, his angular speed is 5 rad/s. What is the ratio of his final rotational KE to his...
Monday, November 14, 2016 by Anonymous

Physics
At the centre of a circular ice rink, a 67.0 kg ice skater moving 2.00 m/s north hits and grabs onto a 41.0 kg ice skater who had been traveling west at 4.30 m/s. If the skaters hold onto each other and the rink has a 42.0 m diameter, what is the amount of time for the skaters...
Monday, November 14, 2016 by Can you do this ?

Physics
A 1340-kg car traveling east at 13.6 m/s (20 mi/h) has a head-on collision with a 1930-kg car traveling west at 20.5 m/s (30 mi/h). If the collision time is 0.10 s, what is the force needed to restrain a 68-kg person in the smaller car? In the larger car?
Monday, November 14, 2016 by Batman

physics
A basketball explodes into three separate pieces. Two pieces of equal mass shoot off at 20.3 m/s, one travelling to the south and one to the west, perpendicular to each other. The third piece has a mass 4 times the size of one of the other pieces. What is the speed of the ...
Monday, November 14, 2016 by Help please!!!

Physics
At the centre of a circular ice rink, a 87.0 kg ice skater moving 2.10 m/s north hits and grabs onto a 51.0 kg ice skater who had been traveling west at 5.35 m/s. If the skaters hold onto each other and the rink has a 26.0 m diameter, what is the amount of time for the skaters...
Monday, November 14, 2016 by HELP ME!!!!!!

physics
For shooting practice a person uses a pellet gun and an empty pop can. The pop can rests on a flat surface that has a coefficient of kinetic friction 0.500. The pellet has a mass of 0.140 kg and the pop can has a mass of 0.470 kg. After the pellet is fired and now inside the ...
Monday, November 14, 2016 by HELP ME!!!!!!

physics
Two people, George who has a mass of 93.0 kg and Victoria who has a mass of 60.0 kg, are on a frozen circular pond. They stand at the very centre and push off of each other. The distance from one side of the pond to the other is 83.0 m and it takes George 15.0 s to reach the ...
Monday, November 14, 2016 by 2FUN

Physics
A 3.70 kg bird is flying past a tree that has a 4.70 kg chipmunk in it. The chipmunk decides to jump on the bird so he can fly too. As the bird is flying past the tree, the chipmunk leaps off at 8.00 m/s in the same direction the bird is flying and lands on the bird. ...
Monday, November 14, 2016 by HELP ME!!!!!!

physics
A missile is fired form the back of a stationary truck. The missile takes off at a speed of 41.7 m/s and has a mass of 53.8 kg. If the truck has a mass of 856 kg, what is the recoil speed of the truck?
Monday, November 14, 2016 by 2FUN

physics
Matt 86.0 kg and his dog 18.0 kg are playing around on a frozen lake. Matt attempts to run across the ice at 2.90 m/s and his dog runs toward him at 1.40 m/s. If his dog jumps up into his arms, what is Matt's speed just after he catches his dog?
Monday, November 14, 2016 by 2FUN

physics
consider your sitting in a chair inside the living room on a leveled floor.if you are at the origin what will be the position vector of spider on any of wall
Monday, November 14, 2016 by Owais

physics
The mass of the Earth is 5.972kg, and the radius of Earth is 6, 371 km. A 750 kg satellite orbits 35, 800 km above Earth in a perfectly circular orbit. 1. If the gravitational force is the centripetal force keeping the satellite in a stable cicular orbit, how does the ...
Monday, November 14, 2016 by LESTER

physics
. Two positive point charge of 12 Î¼C and 8 Î¼C are 10 cm apart. The work done in bringing them 4 cm closer is,
Monday, November 14, 2016 by shayna

PHYSICS
A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle 40Â° with the horizontal (Fig. 6-19). The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (i) the frictional force on the ...
Monday, November 14, 2016 by Carmen

Physics
Two bumper cars crash head on in an elastic collision. One car #1 was moving 2.5 m/s west and car #2 was moving 3.7 m/s east. Each car has a mass of 254 kg. What are the final velocities after the collision? I think this problem is supposed to be solved with m1v1, i + m2v2, i...
Monday, November 14, 2016 by George

Physics
In projectile motion, what angle would the same distance as a 45 degree angle?
Monday, November 14, 2016 by Lester

Physics
A person whose weight is W = 658 N is doing push-ups. From his feet to his center of gravity he is 0.840m and from the center of gravity to his hands is 0.410m. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this ...
Sunday, November 13, 2016 by BrookeNeed

Physics
In a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. In one instance, the radius of the circle is 0.622 m. At one point on this circle, the ball has an ...
Sunday, November 13, 2016 by BrookeNeed

Physics
If a train starts from rest and accelerate at the rate alpha and attains velocity v ,then moves at a constant velocity,then deaccelerates at the rate beta and stops ,if the total distance is found to be l then what is the total time??
Sunday, November 13, 2016 by Nashif

Physics
Two bumper cars crash head on in an elastic collision. One car #1 was moving 2.5 m/s west and car #2 was moving 3.7 m/s east. Each car has a mass of 254 kg. What are the final velocities after the collision? I think this problem is supposed to be solved with m1v1, i + m2v2, i...
Sunday, November 13, 2016 by George

physics
What is the direction and magnitude of the net force acting on the hot air balloon? It has an arrow up with 6300, an arrow down with 3200, an arrow to the right of 1350 and an arrow left with 745. Is this how to do it and if so, how do I convert the sin of theta into degrees. ...
Sunday, November 13, 2016 by Sam

physics
During a crash, a race car driver decelerates from 48.0 m/s to 0 m/s in a distance of 14.9 m. If the drivers mass is 70.0 kg, what is the average force acting on the driver during the crash? This is what I have so far. Am I starting right?
Sunday, November 13, 2016 by Sam

Physics
A team in Quebec is playing ice baseball. A 72 kg player who is initially at rest catches a 145 g ball traveling at 18 m/s. If the player's skates are frictionless, how much time is required for him to glide 5 m after catching the ball?
Sunday, November 13, 2016 by OJ

Physics
You demonstrate hitting a board in a karate class. The speed of your hand as it hits the thick board is 14 m/s with respect to the board, and the mass of your hand is about .80 kg. How deep does your hand go into the board before stopping if the collision lasts for 2. X 10^-3 s?
Sunday, November 13, 2016 by HELP I WANT TO DROP OUT

Physics
An astronaut with a mass of 90 kg (including spacesuit and equipment) is drifting away from his spaceship at a speed o f.2 m/s with respect to the spaceship. The astronaut is equipped only with a 0.5 kg wrench to help him get back to the ship. With what speed and in what ...
Sunday, November 13, 2016 by Kelsey

A child on a swing is traveling at 2 m/s as she passes through the lowest part of swingâ€™s arc. What is the period of the motion?
Sunday, November 13, 2016 by Mona

physics
You decide to use your garden hose to wash your garage door. The water shoots out at a rate of 10 kg/s and a speed of 16 m/s with respect to the hose. When the water hits the garage, its speed decreases to zero. Determine the force that the water exerts on the wall. What ...
Sunday, November 13, 2016 by Abbie

Physics
A 65-kg astronaut pushes against the inside back wall of a 2000kg spaceship and moves toward the front. Her speed increases from 0 to 1.6 m/s If her push lasta 0.3 seconds what is the average force that the astronaut exerts on the wall of the spaceship?? If the spaceship was ...
Sunday, November 13, 2016 by Hang

physics
A child is sitting on a stationary skateboard with a pile of rocks which she throws in one direction in order to make the skateboard travel in the opposite direction. If the rocks each have a mass of 0.95 kg and she can throw them with a speed of 19 m/s relative to the ground...
Sunday, November 13, 2016 by Amy

Physics
a box sliding on a horizontal surface with a speed of 6m/s encounters an incline plane that makes a 15 degree angle with the horizontal line. What is the max distance that will be travelled by the box up the incline before coming to rest if the coefficient of kinetic friction ...
Sunday, November 13, 2016 by Kayla

physics
A bicycle starts from rest and reaches 6.0 m/s after 4 seconds. What is its acceleration?
Sunday, November 13, 2016 by maha

Physics
A bowling ball pendulum demonstration goes bad. The 8.0-lb bowling ball is raised to the height of the demonstrators nose, 160 cm above the ground, and releases the bowling ball. When the bowling ball is at the lowest point of the swing (36 inches above the ground), the knot ...
Sunday, November 13, 2016 by Stuart

Physics
At what other angle (other than 45 degrees) could a gun be fired to travel the same horizontal distance Is the answer: There is not one?
Sunday, November 13, 2016 by Lester

Physics
A force of 123 N acts on a 10.0kg object for 45.6 meters. If the objects starts at rest, and the surface is flat and frictionless, how fast is the object moving after the force is removed. I got acceleration to be 12.3, but I am not sure how to move on with the problem.
Sunday, November 13, 2016 by James

Physics
If sound travels at 330m/s in air, how long does it take for sound to travel 10,000m in air? If sound travels at 1500m/s in water, how long does it take for sound to travel 10,000m in water?
Sunday, November 13, 2016 by Lucyyyyy

Physics C: Mechanics
A 1.00 kg mass is attached to a string wrapped around a cylinder of radius 0.05m. Two masses are connected with a rod and attached to the end of the cylinder, perpendicular to its axis. as the mass falls from rest the rotating contraption spins through 12 pi radians in 1.2 ...
Sunday, November 13, 2016 by Riya

Physics C: Mechanics
A hollow, thin-walled cylinder and a solid sphere start from rest and roll without slipping down an inclined plane of length 5.0 m. The cylinder arrives at the bottom of the plane 2.6 s after the sphere. Determine the angle between the inclined plane and the horizontal.
Sunday, November 13, 2016 by Kani

physics
a metal bar 70cm long and 4.00 kg in mass supported on two knief -edge placed 10 cm from each end. a 6.00 kg weight is suspended at 30 cm from one end . find the reaction at the knife-edge ?
Sunday, November 13, 2016 by nirbhay

Physics
A child pushes a wagon with a passenger of total mass 42 kg along a horizontal surface as fast as the child can run, and then releases the wagon, which continues for another 16 m before stopping. The coefficient of kinetic friction acting to slow the wagon is 0.18. What was ...
Saturday, November 12, 2016 by Jatin

Physics
A 125-g arrow is shot vertically upward with an initial speed of 28 m/s. Assuming 30% loss in total mechanical energy while ascending, what maximum height above the position from which it was shot does the arrow reach?
Saturday, November 12, 2016 by Matt

physics
What is the kinetic energy gained by a 500kg car accelerating from rest to 27m/s? 1/2=mv^2 > 1/2(500)(27m/s)^2= 182,250J a. What is the power output in watts of the engine that causes this acceleration in 4.00s? 27m/s*4s= 108m/s^2 1/2(500)(108)= 27,000 Watts b. How many ...
Saturday, November 12, 2016 by JAY

PHYSICS
Heat transfer Q and work done W are always energy in transit, whereas internal energy E is energy stored in a system. Give an example of each type of energy, and state specifically how it is either in transit or resides in a system.
Saturday, November 12, 2016 by JAY

Physics
Imagine you are driving a car up Pikeâ€™s Peak in Colorado. To raise a car weighing 1000 kilograms a distance of 100 meters would require about a million joules. You could raise a car 12.5 kilometers with the energy in a gallon of gas (if all stored chemical ...
Saturday, November 12, 2016 by JAY

physics
Rain drops do not accelerate for long terminal speed due to the vicious drag of the air.if this did not happen rain drop would hit us with a dangerous high speed.discuss
Saturday, November 12, 2016 by ameen

Physics - Energy
An airplane is flying with a speed of 250km/h at a height of 3610m above the ground. A parachutist whose mass is 75.2kg, jumps out of the airplane, opens the parachute and then lands on the ground with a speed of 3.75m/s . How much energy was dissipated on the parachute by the...
Saturday, November 12, 2016 by Kidd

physics
a uniform wooden beam 10 m long ang weighting 200 N is used to support a load of 300 N on the left end , and 500 N on the right end. Determine the center of the gravity if another load of 80 N is 2 m from the left end
Saturday, November 12, 2016 by angelan

PHYSICS
To pull a car out of a ditch, one end of the rope POR is tied around a pillar at P and the other end is tied to the car at R. A force of 100N is applied to the Center O of the rope and perpendicular to PR. find the tensions in the rope if the angle POR = 150 degrees
Saturday, November 12, 2016 by Anonymous

Physics
A car is traveling at 7.0 m/s when the driver applies the brakes. The car moves 1.5 m before it comes to a complete stop. If the car had been moving at 14 m/s, how far would it have continued to move after the brakes were applied? Assume the braking force in both cases is ...
Saturday, November 12, 2016 by Kayla

Physics
If a racehorse starts from rest and accelerates at a rate of 4.7 m/s2, how long does it take the horse to go 20 m?
Friday, November 11, 2016 by Brook

Physics - Buoyant Force Question
Find the buoyant force on a helium balloon in air (Standard Pressure and Temperature) if the balloon is spherical with diameter 12.0 cm.
Friday, November 11, 2016 by Anon