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April 19, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
Two 4.0cm × 4.0cm square aluminum electrodes, spaced 0.50mm apart are connected to a 300V battery. What is the charge on the positive electrode? I already found the capacitance which turned out to be 28 pF.
Tuesday, January 27, 2015 at 8:55pm

Physics
A bicycle wheel has a diameter of 47.6 cm and a mass of 0.809 kg. The bicycle is placed on a stationary stand on rollers and a resistive force of 60.1 N is applied to the rim of the tire. Assume all the mass of the wheel is concentrated on the outside radius. In order to give ...
Tuesday, January 27, 2015 at 8:27pm

Physics
A bicycle wheel has a diameter of 47.6 cm and a mass of 0.809 kg. The bicycle is placed on a stationary stand on rollers and a resistive force of 60.1 N is applied to the rim of the tire. Assume all the mass of the wheel is concentrated on the outside radius. In order to give ...
Tuesday, January 27, 2015 at 8:22pm

Physics
A soccer ball is kicked with a velocity of 12m/s, HORIZONTALLY off a building which is 8.5m high. What is the velocity of the ball after 1.25s? This is what I found so far: Vi = 12m/s Dx = 15.8049336m Dy = 8.5m Time it took for ball to hit floor 1.31707778s I used D=Vi(T) + 1/...
Tuesday, January 27, 2015 at 8:21pm

physics
A block with initial velocity of 3 m/s slides 9m across a rough horizontal surface before coming to rest. What is the coefficient of kinetic friction? V^2=Vo^2+2ax 0=9+18x a=-1/2 Ffr=mukFn Sigma F=ma ma=mukFn
Tuesday, January 27, 2015 at 8:11pm

Physics
A(n) 0.491 kg football is thrown with a speed of 17.8 m/s. A stationary receiver catches the ball and brings it to rest in 0.0147 s. What is the magnitude of the impulse de- livered to the ball? Answer in units of kg · m/s
Tuesday, January 27, 2015 at 7:58pm

Physics
A 0.145 kg baseball pitched at 39.9 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. If the contact time between r the bat and ball is .001 s, calculate the average force between the ball and bat during contact. I know the answer is 13300 N, ...
Tuesday, January 27, 2015 at 7:14pm

physics
A boy on a 2.2 kg skateboard initially at rest tosses a(n) 8.4 kg jug of water in the forward direction. If the jug has a speed of 3.0 m/s relative to the ground and the boy and skateboard move in the opposite direction at 0.60 m/s, find the boy’s mass. Answer in units of kg
Tuesday, January 27, 2015 at 7:13pm

Physics
By trial and error, a frog learns that it can leap a maximum horizontal distance of 1.26 m. If, in the course of an hour, the frog spends 27.5 % of the time resting and 72.5 % of the time performing identical jumps of that maximum length, in a straight line, what is the ...
Tuesday, January 27, 2015 at 5:11pm

Physics
An object fired at an angle of 31.9° above the horizontal takes 2.55 s to travel the last 15.5 m of its vertical distance and the last 10.5 m of its horizontal distance. With what speed was the object launched? (Note: This problem does not stipulate that the initial and ...
Tuesday, January 27, 2015 at 5:10pm

Physics
A plane diving with constant speed at an angle of 52.5° with the vertical, releases a package at an altitude of 499 m. The package hits the ground 3.87 s after release. How far horizontally does the package travel?
Tuesday, January 27, 2015 at 5:10pm

Physics
What is the maximum height above ground a projectile of mass 0.67 kg, launched from ground level, can achieve if you are able to give it an initial speed of 78.5 m/s?
Tuesday, January 27, 2015 at 5:10pm

Physics
For a science fair competition, a group of High School students built a kicker-machine that can launch a golf ball from the origin with a velocity of 12.9 m/s and initial angle of 31.7° with respect to the horizontal. a) Where will the golf ball fall back to the ground? ...
Tuesday, January 27, 2015 at 5:09pm

Physics
You are practicing throwing darts in your dorm. You stand 3.21 m from the wall on which the board hangs. The dart leaves your hand with a horizontal velocity at a point 1.94 m above the ground. The dart strikes the board at a point 1.73 m from the ground. a) Calculate the time...
Tuesday, January 27, 2015 at 5:09pm

Physics
In an action movie, the heroine is supposed to jump with a motorcycle from the roof of one skyscraper to another one. The roof of the second skyscraper is h=9 meters lower, and the gap between the buildings is d=15 meters wide. Both roofs are horizontal and flat. Neglecting ...
Tuesday, January 27, 2015 at 5:08pm

Physics
A juggler tosses a ball h = 2 m into the air with one hand and catches it with the other hand at the same level. Neglecting air resistance, how long is the ball in the air?
Tuesday, January 27, 2015 at 5:08pm

Physics
If you throw a ball into the air at some angle with respect to the horizontal, which of the following statements about the ball is true? The acceleration is zero at the top of the motion The horizontal component of the velocity is zero at the top of the motion The velocity is ...
Tuesday, January 27, 2015 at 5:08pm

Physics
Pease evaluate the statements by choosing from these three statements Always true: the statement is true under any circumstances Not necessarily true: the statement may be true in some circumstances, but not in others Always false: under no circumstances is this true 1. If you...
Tuesday, January 27, 2015 at 5:07pm

Physics
The captain of a boat wants to travel directly across a river that flows due east with a speed of 1.09 m/s. He starts from the south bank of the river and wants to reach the north bank by travelling straight across the river. The boat has a speed of 6.44 m/s with respect to ...
Tuesday, January 27, 2015 at 5:06pm

Physics
The air speed indicator of a plane that took off from Detroit reads 349 km/h and the compass indicates that it is heading due east to Boston. A steady wind is blowing due north at 46.5 km/h. a) Calculate the speed of the plane with reference to the ground. b) If the pilot ...
Tuesday, January 27, 2015 at 5:05pm

Physics
A swimmer is heading straight for the other shore of a river with a velocity of vs=0.5 m/s relative to the water, but is carried away by the current, which has a velocity of vr=0.4 m/s. It takes her 20.6 s to get across. How far downstream does she end up?
Tuesday, January 27, 2015 at 5:05pm

Physics
During a long airport layover, a physicist father and his 8-year-old daughter try a game that involves a moving walkway. They have measured the walkway to be 41.5 m long. The father has a stopwatch and times his daughter. First, the daughter walks with a constant speed in the ...
Tuesday, January 27, 2015 at 5:05pm

Physics
A man in search of his dog drives first 13.3 mi northeast, then 17.3 mi straight south, and finally 6.85 mi in a direction 30.3° north of west. 1. a) What is the magnitude of his resultant displacement? 2. b) What is the direction of his resultant displacement? Express ...
Tuesday, January 27, 2015 at 5:04pm

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

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