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March 3, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
Two towers(the towers are the same) are built next to each other. the distance between them is d and there height is 10,000d. a ball is thrown horizontally from one tower to the other with spped v=sqrt(gd/2). assuming the ball collied elasticlly with the wall, therfore his ...
Tuesday, January 27, 2015 at 3:56pm

physics- vectors
In the sum Vector A plus Vector B equals vector C, vector A has a magnitude of 11.6 m and is angled 36.5° counterclockwise from the +x direction, and vector C has a magnitude of 14.0 m and is angled 17.1° counterclockwise from the -x direction. What are (a) the ...
Tuesday, January 27, 2015 at 3:27pm

Physics
A 26.3 g marble sliding to the right at 21.0 cm/s overtakes and collides elastically with a 13.3 g marble moving in the same direction at 12.2 cm/s. After the collision, the 13.3 g marble moves to the right at 23.7 cm/s. Find the velocity of the 26.3 g marble after the collision.
Tuesday, January 27, 2015 at 3:02pm

Physics
What is the gravitational force between two 10 kg iron balls separated by a distance of 0.1 m? How does this compare with the weight of one ball?
Tuesday, January 27, 2015 at 2:31pm

Physics
What is the Earth's gravitational force on you when you are standing on the Earth and when you are riding in the Space Shuttle 380 km above the Earth's surface? Answer as a fraction of the surface gravity of Earth. (The Earth's radius is 6400 km.)
Tuesday, January 27, 2015 at 1:55pm

physics
A rod with length L and mass m stand on a frictionless table. a ball with mass m and speed u cimped perpendicular to the rod a distance x from the bottom of the rod and sticks to it. what is the angular velocity of the rod+ball after the collison? I need help on how to solve ...
Tuesday, January 27, 2015 at 12:49pm

Physics
In the sum Vector A plus Vector B equals vector C, vector A has a magnitude of 11.6 m and is angled 36.5° counterclockwise from the +x direction, and vector C has a magnitude of 14.0 m and is angled 17.1° counterclockwise from the -x direction. What are (a) the ...
Tuesday, January 27, 2015 at 12:44pm

Physics
A 10.0-kg block is released from point A in Figure P8.57. The track is frictionless except for the portion between points B and C , which has a length of 6.00 m. The block travels down the track, hits a spring of force constant 2 250 N/m, and compresses the spring 0.300 m from...
Tuesday, January 27, 2015 at 5:56am

Physics
A small rocket is fired in a test range. It rises high into the air and soon runs out of fuel. On the way down it passes near an observer (sitting in a 21.5-m-high tower) who sees the rocket traveling at a speed of 35 m/s and moving in a vertical plane at an angle of 56° ...
Tuesday, January 27, 2015 at 3:36am

Physics
How much work is it to push a box (mass 120 kg) up an incline (angle 16 degrees with the horizontal) that is 9.6 meters long, if the coefficient of kinetic friction between the box and the incline is 0.5?
Tuesday, January 27, 2015 at 12:38am

Physics
You (m=75.0 kg) are floating outside your space station, and- oh no- a siren sounds, and the doors start to close! At the instant the siren sounds, you are exactly 10.0 m from the station doors and floating away from the space station at a speed of 1.00 m/s. The doors will ...
Tuesday, January 27, 2015 at 12:27am

Physics
A 2170 kg car moving east at 10.5 m/s collides with a 3230 kg car moving east. The cars stick together and move east as a unit after the collision at a velocity of 6.00 m/s. a) What is the velocity of the 3230 kg car before the collision? Answer in units of m/s. 016 (part 2 of...
Monday, January 26, 2015 at 11:34pm

physics
In the sum Vector A plus Vector B equals vector C, vector A has a magnitude of 11.6 m and is angled 36.5° counterclockwise from the +x direction, and vector C has a magnitude of 14.0 m and is angled 17.1° counterclockwise from the -x direction. What are (a) the ...
Monday, January 26, 2015 at 11:27pm

Physics - Vectors
Vector A has a magnitude of 2.2 units, vector B has a magnitude of 10 units, and Vector A times Upper B has a value of 14.0. What is the angle between the directions of Vector A and Vector B?
Monday, January 26, 2015 at 11:20pm

Physics
A railroad car with a mass of 2.33 × 104 kg moving at 3.71 m/s collides and joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.44 m/s. a) What is the final speed of the three ...
Monday, January 26, 2015 at 11:19pm

physics
A train whistle is heard at 310Hz as the train approaches town. The train cuts its speed in half as it nears the station, and the sound of the whistle is then 300 Hz.
Monday, January 26, 2015 at 10:23pm

physics
A 425 g model rocket is accelerated upward at 86 m/s2 by its engine. What is the value of the force exerted by the engine on the rocket?
Monday, January 26, 2015 at 7:18pm

physics
A little girl with a mass of 33 kg jumps on a trampoline that has an elastic constant of 2336 N/m. When she jumps onto the trampoline it sinks 81 cm. Assuming that all of the energy of the trampoline launches her into the air, how far will she rise?
Monday, January 26, 2015 at 6:41pm

physics
Two blocks of equal masses are connected by a string. Block 1 is pulled by a force of 30 N which accelerates both blocks at 3 m/s2 along a surface of negligible friction A) find the masses of each block B) find the tension
Monday, January 26, 2015 at 6:28pm

physics
What percentage of the takeoff velocity did the plane gain when it reached the midpoint of the runway?
Monday, January 26, 2015 at 6:19pm

Physics - test question verification
Forces of 2.4 N and 1.8 N act on an object at right angles to one another. What is the magnitude of a third force acting on the same object so that it remains stationary? A) 3.0 N B) 4.2 N C) 0.6 N I dont understand how the answer is A)
Monday, January 26, 2015 at 5:59pm

Physics
A gardener pushes a mower at a distance of 900 m while mowing the yard. The handle of the mower makes an angle of 40.0 with the ground. The gardener exerts a force of 35.0 n along the handle of the mower. How much work does the gardener do in mowing the lawn?
Monday, January 26, 2015 at 4:13pm

physics
It is night and a wilderness camper is in distress. To signal for help, they take a flare gun into a clearing and fire a flare up from the ground at a speed of 15 m/s. a) How high does the flare make it into the sky? b) How long is the flare in the sky? c) If the surrounding ...
Monday, January 26, 2015 at 4:07pm

physics
A ship emits a sound wave to the bottom of the ocean in water, whose speed is 1150 m/s. It takes 3.25 seconds for the sound to return. Determine how deep the ocean is.
Monday, January 26, 2015 at 1:50pm

Physics
A golfer takes three putts to get the ball into the hole. The first putt displaces the ball 3.32 m north, the second 1.63 m southeast, and the third 0.703 m southwest. What are (a) the magnitude and (b) the angle between the direction of the displacement needed to get the ball...
Monday, January 26, 2015 at 1:19pm

Physics
A golfer takes three putts to get the ball into the hole. The first putt displaces the ball 3.32 m north, the second 1.63 m southeast, and the third 0.703 m southwest. What are (a) the magnitude and (b) the angle between the direction of the displacement needed to get the ball...
Monday, January 26, 2015 at 1:15pm

Physics
19. Two people of unequal mass are initially standing still on the ice with negligible friction. They then simultaneously push each other horizontally. Afterward, which of the following is true? * -The center of mass of the two person system moves in the direction of the less ...
Monday, January 26, 2015 at 12:46pm

physics
A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.
Monday, January 26, 2015 at 12:07pm

physics
Why a magnet lose magnetism when heated?
Monday, January 26, 2015 at 10:45am

Physics
An object is thrown with speed of 17 m/s at an angle of 550. find the time it takes to reach its maximum height.
Monday, January 26, 2015 at 8:35am

physics
In a chase scene, a movie stuntman runs horizontally off the flat roof of one building and lands on another roof 2.0m lower. If the gap between the buildings is 4.4m wide, how fast must he run to cross the gap? Express your answer to two significant figures and include the ...
Monday, January 26, 2015 at 1:25am

Physics
A 26.3 g marble sliding to the right at 21.0 cm/s overtakes and collides elastically with a 13.3 g marble moving in the same direction at 12.2 cm/s. After the collision, the 13.3 g marble moves to the right at 23.7 cm/s. Find the velocity of the 26.3 g marble after the ...
Monday, January 26, 2015 at 12:35am

Physics
Two carts with masses of 4.3 kg and 3.9 kg move toward each other on a frictionless track with speeds of 5.6 m/s and 5.0 m/s, respec- tively. The carts stick together after colliding head-on. Find their final speed.
Monday, January 26, 2015 at 12:26am

Physics
A 64.3 kg astronaut is on a space walk when the tether line to the shuttle breaks. The astronaut is able to throw a 10.0 kg oxygen tank in a direction away from the shuttle with a speed of 11.9 m/s, propelling the astronaut back to the shuttle. Assuming that the astronaut ...
Monday, January 26, 2015 at 12:11am

Physics
A 6.6 g bullet is stopped in a block of wood (mw = 6 kg). The speed of the bullet-pluswood combination immediately after the collision is 0.8 m/s. What was the original speed of the bullet? Answer in units of m/s.
Monday, January 26, 2015 at 12:09am

Physics
A 2170 kg car moving east at 10.5 m/s collides with a 3230 kg car moving east. The cars stick together and move east as a unit after the collision at a velocity of 6.00 m/s. a) What is the velocity of the 3230 kg car before the collision?
Monday, January 26, 2015 at 12:03am

Physics
A football punter accelerates a 0.53 kg foot- ball from rest to a speed of 8.6 m/s in 0.24 s. What constant force does the punter e
Sunday, January 25, 2015 at 11:53pm

Physics
A 83.8 kg astronaut is working on the en- gines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several sec- onds later is 39.6 m behind the ship, at rest relative to the spaceship. The only way to re- turn ...
Sunday, January 25, 2015 at 11:45pm

Physics
a batter hits a baseball into the air. If the horizontal component (X-component) of the velocity is measured to be 20.4 m/s, if at it's max height the ball was in the air for 2.5 s, at what angle was the ball hit off the bat?
Sunday, January 25, 2015 at 10:10pm

Physics
a bullet is fired horizontally from the top of a cliff that is 15 m above a long lake. if the muzzle speed is 478, how far from the bottom of the cliff does the bullet strike the surface of the lake
Sunday, January 25, 2015 at 10:10pm

physics
(e) If the speed of the ball at the bottom of the circle is v, what is the expression for the centripetal force on the ball in terms of its speed v and the length L of the string? Take the upward direction as positive and the downward direction as negative when considering ...
Sunday, January 25, 2015 at 9:34pm

physics
A car is speeding at 25 m/s in a school zone. A police car starts from rest just as the speeder passes and accelerates at a constant rate of 5 m/s2. How fast is the police car traveling when it is 25 m behind the speeding car? I honestly don't know where to start. We don&#...
Sunday, January 25, 2015 at 9:09pm

physics
John and Mary are skating at an ice rink. John skates at a constant speed of 6.7 m/s, with respect to the ice surface, directly south. Mary skates at a constant speed of 11.5 m/s in a direction of 34° west of south, with respect to the ice. What are the magnitude and ...
Sunday, January 25, 2015 at 9:08pm

Physics (Classical)
John and Mary are skating at an ice rink. John skates at a constant speed of 6.7 m/s, with respect to the ice surface, directly south. Mary skates at a constant speed of 11.5 m/s in a direction of 34° west of south, with respect to the ice. What are the magnitude and ...
Sunday, January 25, 2015 at 9:07pm

physics
How much heat must be removed from 456 g of water at 25.0°C to change it into ice at -10.0°C? The specific heat of ice is 2090 J/kg ∙ K, the latent heat of fusion of water is 33.5 × 104 J/kg, and the specific heat of water is 4186 J/kg ∙ K.
Sunday, January 25, 2015 at 8:57pm

physics
In a chase scene, a movie stuntman runs horizontally off the flat roof of one building and lands on another roof 2.0m lower. If the gap between the buildings is 4.4m wide, how fast must he run to cross the gap? Express your answer to two significant figures and include the ...
Sunday, January 25, 2015 at 8:08pm

Physics
A driver in a car traveling at a speed of 55.4 mi/h sees a deer 116 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assuming that the deer does not move in the meantime). I simply do not know how ...
Sunday, January 25, 2015 at 7:39pm

physics
a 0.25 kg mass at the end of a spring oscillates 2.2 times per second with an amplitude of 0.15m. Determine the speed when it passes the equilibrium point and the speeed when it is 0.1 m from equilibrium
Sunday, January 25, 2015 at 7:36pm

physics
a spring with a k=225 N/m is attached to a ball (m=1.00kg) on a horizontal frictionless table. The ball is pulled 15.0 cm to the right and then released: Find f
Sunday, January 25, 2015 at 7:32pm

physics
A small mass is attached to a 3.00m string and is raised at an angle of 65 degrees. What is its maximum speed? I've come to the conclusion that I'd need to how far it is to the ground to use the formula Eg = mg(delta)h however how wouldi approach doing that? After that...
Sunday, January 25, 2015 at 6:47pm

physics
You're heading an international effort to save Earth from an asteroid heading toward us at 11km/s . Your team mounts a rocket on the asteroid and fires it for 10 min, after which the asteroid is moving at 21km/s at 32∘ to its original path. In a news conference, what...
Sunday, January 25, 2015 at 6:36pm

physics
A hockey puck moving at 37m/s slams through a wall of snow 31cm thick. It emerges moving at 15m/s . Part A Assuming constant acceleration, find the time the puck spends in the snow. Express your answer to two significant figures and include the appropriate units. Part B ...
Sunday, January 25, 2015 at 6:35pm

physics
A model rocket leaves the ground, heading straight up at 45m/s . Part A What's its maximum altitude? Express your answer to two significant figures and include the appropriate units. Part B Find its velocity at 1 s? Express your answer to two significant figures and ...
Sunday, January 25, 2015 at 6:26pm

physics
You drop a rock into a deep well and 4.1s later hear the splash. How far down is the water? Neglect the travel time of the sound. Express your answer using two significant figures.
Sunday, January 25, 2015 at 6:24pm

physics
A cannon fires a shell straight upward; 2.4 s after it is launched, the shell is moving upward with a speed of 18 m/s. Assuming air resistance is negligible, find the speed (magnitude of velocity) of the shell at launch and 5.4 s after the launch. What is the velocity at ...
Sunday, January 25, 2015 at 5:50pm

physics
The wheels of a certain roller coaster are both above and below the rails as shown in the figure so that the car will not leave the rails. The mass supported by this particular wheel is 117 kg and the radius of this section of track is 44 m. The acceleration of gravity is 9.8 ...
Sunday, January 25, 2015 at 12:56pm

physics
An 94.4 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 29.6 m behind the ship, at rest relative to the spaceship. The only way to return to ...
Sunday, January 25, 2015 at 12:01pm

physics
A 24.0 g marble sliding to the right at 60.8 cm/s overtakes and collides elastically with a 12.0 g marble moving in the same direction at 15.2 cm/s. After the collision, the 12.0 g marble moves to the right at 76 cm/s. Find the velocity of the 24.0 g marble after the collision.
Sunday, January 25, 2015 at 11:43am

physics
A 2100 kg car traveling at 12.0 m/s collides with a 2780 kg car that is initially at rest at the stoplight. The cars stick together and move 3.90 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that ...
Sunday, January 25, 2015 at 11:38am

Physics
Two forces of 5N and 7N respectively act on an object,When will the resultand of the two vectors be at max?
Sunday, January 25, 2015 at 11:11am

Physics Pendulum
1. Many pendulums used in clocks are made of a thin metal bar with a very thin (in the plane of oscillation) adjustable bob. a) Why the emphasis on a thin bar and bob? b) for what reasons would the bob be moved up or down the bar? 2. A young child sits on a playground swing ...
Sunday, January 25, 2015 at 9:00am

Physics
50 grams of ice cubes at -5oC is added to a 1 litre (1 kg) of water that is initially at 30oC. a) Use the table of values to find the energy needed to melt the ice:(energy to raise the temperature of the ice to 0oC+ change the state of the ice to water) b) Hence find the ...
Sunday, January 25, 2015 at 8:43am

Physics
At what speed must I travel, in kms, if i need to travel 22.6 kms in 18 minutes?
Sunday, January 25, 2015 at 5:42am

physics
two ectors act on the same pont. what should the angle between them be so that a maximum resultant is obtained a. o degree b. 90 degree c. 180 degree d. cannot tell answer : a. 0 degree
Sunday, January 25, 2015 at 3:05am

Maths and Physics
An inverted garbage can of Weight W is suspended in air by water from a geyser. The water shoots up from the ground with a speed u, at a constant rate dm/dt. Find the maximum height at which the garbage can rides.What assumption must be fulfilled for the maximum height to be ...
Sunday, January 25, 2015 at 2:57am

Physics
In a 100 m linear accelerator, an electron is accelerated to 1.40% of the speed of light in 46.0 m before it coasts for 54.0 m to a target. What's the electron's acceleration during the first 46.0 m? b) How long does the total flight take?
Saturday, January 24, 2015 at 9:35pm

physics
One particle has a mass of 2.86 x 10-3 kg and a charge of +7.32 μC. A second particle has a mass of 6.41 x 10-3 kg and the same charge. The two particles are initially held in place and then released. The particles fly apart, and when the separation between them is 0.127 ...
Saturday, January 24, 2015 at 8:56pm

physics
Tom has a mass of 67.2 kg and Sally has a mass of 58.5 kg. Tom and Sally are standing 23 m apart on a massless dance floor. Sally looks up and she sees Tom. She feels an attraction. If the attraction is gravitation, find its magnitude. Assume both can be replaced by spherical ...
Saturday, January 24, 2015 at 8:41pm

physics
A series of two 2.0 kg blocks are attached together through string B.Two of the blocks weigh each 2.0 kg and are now being use for a new experiment. The blocks are being pulled upwards by another string A with a force of 25 N. What is the acceleration of the blocks?(3.55 m/s^2...
Saturday, January 24, 2015 at 8:33pm

physics
A series of two 2.0 kg blocks are attached together through string B.Two of the blocks weigh each 2.0 kg and are now being use for a new experiment. The blocks are being pulled upwards by another string A with a force of 25 N. What is the acceleration of the blocks?(3.55 m/s^...
Saturday, January 24, 2015 at 7:13pm

Intro. Physics!!!
1------- A -10 uC charge is placed 0.20 m away from an unknown charge. The force between the two charges is found to be attractive and has a value of 9.0 N. What is the magnitude and sign of the other charge? 2-------- A -5 uC charge is a distance of 12 cm from a 7 uC charge. ...
Saturday, January 24, 2015 at 7:00pm

Physics
1) if a positive and negative charge each has a magnitude of 6 uC and are separated by a distance of 10 cm, what is the force between the particles? 2) Given that the repulsive force between two identical positive point charges is 1.0 N when the charges are 0.5 m apart, what ...
Saturday, January 24, 2015 at 6:52pm

College Physics
Two pucks traveling at each other collide and deflect at 30.0° angles from their original velocities. The mass of Puck B is 20% greater than the mass of Puck A. Before colliding, the pucks approach each other with momenta of equal magnitudes and opposite directions. After ...
Saturday, January 24, 2015 at 6:34pm

College Physics
An electron in a television tube travels the 12 cm distance from the grid to the screen at an average speed of 7.00 107m/s. How long does the trip take?
Saturday, January 24, 2015 at 5:52pm

Physics
A motorcycle is following a car that is traveling at constant speed on a straight highway. Initially, the car and the motorcycle are both traveling at the same speed of 19.0m/s , and the distance between them is 52.0m . After t1 = 5.00s , the motorcycle starts to accelerate at...
Saturday, January 24, 2015 at 4:33pm

Physics
A motorcycle is following a car that is traveling at constant speed on a straight highway. Initially, the car and the motorcycle are both traveling at the same speed of 19.0m/s , and the distance between them is 52.0m . After t1 = 5.00s , the motorcycle starts to accelerate at...
Saturday, January 24, 2015 at 4:33pm

Physics
Three charges, Q1, Q2 and Q3 are located on a straight line. The charge Q3 is located 0.136 m to the right of Q2. The charges Q1 = 1.22 μC and Q2 = -2.46 μC are fixed at their positions, distance 0.301 m apart, and the charge Q3 = 3.03 μC could be moved along ...
Saturday, January 24, 2015 at 4:18pm

physics
Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.82 m. The stones are thrown with the same speed of 8.88 m/s. Find the location (above the base of the ...
Saturday, January 24, 2015 at 3:13pm

physics
an orienteer runs 300m north and then 400m to the southeast (at a 45 degree angle to north). if he runs at a constant speed, how far away is he from the starting position?
Saturday, January 24, 2015 at 3:08pm

Physics
A car slows down from a speed of 24.0m/s to rest in 9.0s, How far did it travel in that time?
Saturday, January 24, 2015 at 1:55pm

Physics
Any help direction is appreciated. Inez is putting up decorations for her sister's quinceanera (fifteenth birthday party). She ties three light silk ribbons together to the top of a gateway and hangs from each ribbon a rubber balloon. To include the effects of the ...
Saturday, January 24, 2015 at 1:40pm

physics
After coming down a steep hill at a constant speed of 49 m/s, a car travels along the circumference of a vertical circle of radius 329 m until it begins to climb another hill. What is the magnitude of the resultant force on the 170 kg driver of the car at the lowest point on ...
Saturday, January 24, 2015 at 1:20pm

physics
A ball of mass 21.7 g is attached to a cord of length 0.61 m and rotates in a vertical circle. What is the minimum speed the ball must have at the top of the circle so the cord does not become slack? The acceleration of gravity is 9.8 m/s . Answer in units of m/s
Saturday, January 24, 2015 at 1:03pm

Physics
Two students on roller skates stand face-toface, then push each other away. One student has a mass of 96 kg and the second student 56 kg. Find the ratio of the magnitude of the first student’s velocity to the magnitude of the second student’s velocity.
Saturday, January 24, 2015 at 7:46am

Physics
car leaves skid mark 72m in length with a deceleration speed of 7.20m/s^2. what was the initial speed prior to braking?
Saturday, January 24, 2015 at 12:55am

physics
A boy on a 1.9 kg skateboard initially at rest tosses a(n) 8.0 kg jug of water in the forward direction. If the jug has a speed of 2.7 m/s relative to the ground and the boy and skateboard move in the opposite direction at 0.65 m/s, find the boy’s mass. Answer in units of kg
Friday, January 23, 2015 at 9:25pm

physics
A(n) 0.364 kg soccer ball approaches a player horizontally with a speed of 19.7 m/s. The player illegally strikes the ball with her hand and causes it to move in the opposite direction with a speed of 22.4 m/s. What is the magnitude of the impulse delivered to the ball by the ...
Friday, January 23, 2015 at 9:24pm

physics
A physical pendulum is constructed of a 48 cm long piece of wooden dowel with a mass of 550 grams and a radius of 0.7 cm. Attached at one end of the pipe is a hoop with a radius of 6 cm and a mass of 1.2 kg as shown. The pendulum is released from the 12:00 position and allowed...
Friday, January 23, 2015 at 8:35pm

Physics
A)A very narrow beam of white light is incident at 42.20° onto the top surface of a rectangular block of flint glass 12.6 cm thick. The indices of refraction of the glass for red and violet light are 1.647 and 1.672, respectively. Calculate the dispersion angle (i.e., the ...
Friday, January 23, 2015 at 8:33pm

physics
A hockey puck slides with an initial speed of 40.7 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.038, what is the speed of the puck after 11.9 s?
Friday, January 23, 2015 at 6:35pm

Physics
A car leaves skid marks 72m in length. The deceleration is 7.2m/s^2. What is the speed of the car before braking?
Friday, January 23, 2015 at 5:42pm

Physics
In the Daytona 500 auto race, a Ford Thunderbird and a Mercedes Benz are moving side by side down a straight-away at 67.5 m/s. The driver of the Thunderbird realizes he must make a pit stop, and he smoothly slows to a stop over a distance of 250 m. He spends 5.00 s in the pit ...
Friday, January 23, 2015 at 5:17pm

physics
A 1100·kg elevator is attached to a cable whose tension is 10900·N. What is the magnitude of the elevator's acceleration?
Friday, January 23, 2015 at 2:01pm

integrated physics and chemistry
The velocity of a car traveling north decreases from 20 m/s to 12 m/s in 32 seconds. What is the acceleration of the car? I answered it as 0.25 m/s^2 North. Is this correct?
Friday, January 23, 2015 at 1:51pm

physics
An unknown substance with a mass of 300 g absorbs 1000 j of heat while undergoing a temperature increase of 15 degrees c. What is the specific heat of the unknown substance ?
Friday, January 23, 2015 at 1:09pm

physics
An object has the following equation of motion (equation describing its position as a function of time). x(t) = x0 where x0 = −2.3 m. What is the object’s position at time t = 23 s? What is its velocity?
Friday, January 23, 2015 at 12:43pm

physics
Two girls pull a 15 kg sled, each with her own rope. They pull horizontally at an angle of 30 degrees from each other with identical forces of 25 N each. The coefficient of friction between the snow and the sled is 0.1. The acceleration of gravity is 9.8 m/s2 . What is the ...
Friday, January 23, 2015 at 11:29am

physics
5m ladder leans against frictionless wall. point of contact is 4m above the ground. ladder has uniform mass of 15kg. determine forces by ground and the wall on the ladder
Friday, January 23, 2015 at 7:01am

physics
a stone propelled from a catapult with a speed of 50mls,attains a height of 100m. Calculate the angle of projection and range.
Friday, January 23, 2015 at 12:37am

PHYSICS
A 1250 KG wrecking ball is lifted to a height of 12.7 m above its resting point . When the wrecking ball is released, its swings toward an abandoned building and makes an indentation of 43.7 cm in the wall. A) What is the potential energy of the wrecking ball at a height of 12...
Thursday, January 22, 2015 at 11:11pm

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