Thursday

May 5, 2016
**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 by michael *

**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 by michael *

**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 by Habuta*

**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 by Anonymous*

**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 by Anonymous*

**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 by Anonymous*

**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 by Anonymous*

**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 by Vinay*

**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 by Jackie*

**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 by Bri*

**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 by Bri*

**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 by Bri*

**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 by Zandile Mabi*

**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 by catcat*

**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 by Ying*

**Physics**

At what speed must I travel, in kms, if i need to travel 22.6 kms in 18 minutes?
*Sunday, January 25, 2015 by Miles*

**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 by ruby*

**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 by Anonymous*

**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 by Jay*

**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 by S*

**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 by Andy*

**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 by Anonymous*

**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 by Anonymous*

**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 by Anonymous*

**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 by Help!*

**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 by Bill Smithers*

**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 by John*

**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 by Anonymous*

**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 by Anonymous*

**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 by Anonymous*

**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 by Syd*

**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 by tarkan*

**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 by David*

**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 by Hanna*

**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 by d*

**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 by d*

**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 by Marie*

**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 by David*

**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 by kim*

**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 by kim*

**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 by Jessica*

**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 by Ted*

**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 by confused*

**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 by David*

**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 by Jerry*

**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 by Alex*

**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 by Amy*

**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 by Cynthia*

**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 by Allison*

**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 by Gabe*

**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 by Anonymous*

**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 by Baba*

**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 by Jon*

**Physics **

A(n) 57.3 kg astronaut becomes separated from the shuttle, while on a space walk. She finds herself 54.3 m away from the shuttle and moving with zero speed relative to the shuttle. She has a(n) 0.697 kg camera in her hand and decides to get back to the shuttle by throwing the ...
*Thursday, January 22, 2015 by Tina *

**physics**

The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-4.25 107) t 2 + (3.45 105) t, where v is in meters per second and t is in seconds. The acceleration of the bullet just as it leaves the barrel is zero. (a) Determine the ...
*Thursday, January 22, 2015 by Anonymous*

**Physics**

A dog running in an open field has components of velocity vx = 3.0m/s and vy = -1.1m/s at time t1 = 11.7s . For the time interval from t1 = 11.7s to t2 = 22.2s , the average acceleration of the dog has magnitude 0.55m/s2 and direction 34.5∘ measured from the +x−...
*Thursday, January 22, 2015 by Kelly*

**physics**

An athlete leaves one end of a pool of length L at t = 0 and arrives at the other end at time t1. She swims back and arrives at the starting position at time t2. If she is swimming initially in the positive x direction, determine her average velocities symbolically in the ...
*Thursday, January 22, 2015 by Leah*

**physics**

a force of 1600N is used to push a crate of brick at a rate of 40m/s squard. If the crate weights 150kg, how much do the bricks weight?
*Thursday, January 22, 2015 by Samuel*

**physics **

a 1kg object moving east with a velocity of 10 m/s collides with a .50kg object that is at rest. neglecting friction, what is the momentum of the system? please show work
*Thursday, January 22, 2015 by hussam ali*

**Physics **

The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with acceleration -5.40 m/s2 for 4.40 s, making straight skid marks 63.1 m long ending at the tree. With what speed does the car then strike the tree?
*Thursday, January 22, 2015 by Chad *

**Physics**

A rabbit runs in a straight line with a velocity of +1.3 m/s for a period of time, rests for 11 s, and then runs again along the same line at +0.65 m/s for an unknown amount of time. The rabbit travels a total distance of 1080 m, and its average speed is 0.79 m/s.What is the ...
*Thursday, January 22, 2015 by Wendy*

**Physics**

You raise a bucket of water from the bottom of a well that is 12 m deep. The mass of the bucket and the water is 5.00 kg, and it takes 15 s to raise the bucket to the top of the well. How much power is required? Pe= 60.00 Work= Force*direction
*Thursday, January 22, 2015 by Haylee*

**Physics**

You raise a bucket of water from the bottom of a well that is 12 m deep. The mass of the bucket and the water is 5.00 kg, and it takes 15 s to raise the bucket to the top of the well. How much power is required?
*Thursday, January 22, 2015 by Haylee*

**physics**

A projectile of mass 0.528 kg is shot from a cannon, at height 6.7 m, as shown in the figure, with an initial velocity vi having a horizontal component of 7 m/s. The projectile rises to a maximum height of 3.8 m above the end of the cannon’s barrel and strikes the ground ...
*Thursday, January 22, 2015 by Anonymous*

**physics**

A copper telephone wire has essentially no sag between poles 30 m apart on a winter day when the temperature is −16◦C. How much longer is the wire on a summer day when the temperature is 26 ◦C? Assume that the thermal coefficient of copper is constant ...
*Thursday, January 22, 2015 by joe*

**physics**

A tennis ball has a mass of 58 g and a diameter of 8 cm. Find the moment of inertia about its diameter. Assume that the ball is a thin spherical shell.
*Thursday, January 22, 2015 by Johnathan*

**physics**

The system shown in the figure below consists of a mass M = 3.5-kg block resting on a frictionless horizontal ledge. This block is attached to a string that passes over a pulley, and the other end of the string is attached to a hanging m = 2.2-kg block. The pulley is a uniform...
*Thursday, January 22, 2015 by Johnathan*

**physics**

A 2.1-kg 12-cm-radius cylinder, initially at rest, is free to rotate about the axis of the cylinder. A rope of negligible mass is wrapped around it and pulled with a force of 18 N. (a) Find the magnitude of the torque exerted by the rope. N · m (b) Find the angular ...
*Thursday, January 22, 2015 by Johnathan*

**Physics**

A plane has a max speed of 200 km/h. What is the maximum speed it can travel due west if there's a northwest wind at 50 km/h?
*Thursday, January 22, 2015 by Felix*

**Physics**

A fully equipped astronaut has a mass of 170 kg. If the astronaut has a weight of 675 N standing on the surface of a planet, what is the acceleration due to gravity on this planet?
*Thursday, January 22, 2015 by Kayla*

**physics **

The driver of a car traveling at 60 ft/sec suddenly applies the brakes. The position of the car is s(t) = 50t - 2t2, t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the car come to a stop?
*Thursday, January 22, 2015 by Jeff*

**physics**

A canoe has a velocity of 0.31m/s southeast relative to the earth. The canoe is on a river that is flowing
*Thursday, January 22, 2015 by Anonymous*

**Physics**

In the deep ocean, a water wave with wavelength 95 m travels at 12 m/s. Suppose a small boat is at the crest of this wave, 1.8m above the equilibrium position.What will be the vertical position of the boat 3.0s later?
*Thursday, January 22, 2015 by Emma*

**physics 11**

A 1000 kg car travelling at 25m/s south collides head-on with a 2250 kg car travelling at 10m/s in the opposite direction. They stick together after collision. Which way does the wreckage move? What is their final velocity?
*Thursday, January 22, 2015 by Deep*

**Physics**

What is the y-component of a vector in the x-y plane whose magnitude is 87.8 and whose x-component is 64.9?
*Wednesday, January 21, 2015 by Tanner*

**Physics**

I have a test tomorrow and I don't really understand this question, I was hoping somebody could help explain it? If 2.75x10¹⁹ electrons pass a point in a circuit in 30s, what is the current?
*Wednesday, January 21, 2015 by Kyra*

**physics**

A football is kicked at ground level with a speed of 15.4 m/s at an angle of 34.7° to the horizontal. How much later does it hit the ground? (in s)
*Wednesday, January 21, 2015 by Tanner*

**Physics**

Romeo is chucking pebbles gently up to Juliet's window and he wants the pebbles to hit the window with only a horizontal component of velocity (the least possible speed). He is standing at the edge of a rose garden at H = 4.62 m below her window and at D = 5.21 m from the ...
*Wednesday, January 21, 2015 by Tanner*

**Physics**

He is standing at the edge of a rose garden at H = 4.62 m below her window and at D = 5.21 m from the base of the wall. How fast are the pebbles going when they hit her window?
*Wednesday, January 21, 2015 by Madison*

**physics**

A diver running 1.89 m/s dives out horizontally from the edge of a vertical cliff and 2.88 s later reaches the water below. How high was the cliff. (in m)
*Wednesday, January 21, 2015 by Madison*

**physics**

A string that passes over a pulley has a 0.375 kg mass attached to one end and a 0.630 kg mass attached to the other end. The pulley, which is a disk of radius 9.50 cm, has friction in its axle. What is the magnitude of the frictional torque that must be exerted by the axle if...
*Wednesday, January 21, 2015 by Johnathan*

**physics**

A cat walks along a uniform plank that is 4.00 m long and has a mass of 7.00 kg. The plank is supported by two sawhorses, one 0.44 m from the left end of the board and the other 1.60 m from its right end. When the cat nears the right end, the plank just begins to tip. If the ...
*Wednesday, January 21, 2015 by Johnathan*

**physics**

The components of a vector V are often written (Vx, Vy, Vz). What is the x component of a vector which is the sum of the two vectors, V1 and V2, whose components are (3.27, 1.86, 0.00) and (3.85, -3.53, -1.43)?
*Wednesday, January 21, 2015 by Madison*

**physics**

A 10.7 kg bowling ball moves in a straight line at 4.26 m/s. How fast must a 2.55 g Ping-Pong ball move in a straight line so that the two balls have the same momentum?
*Wednesday, January 21, 2015 by chris*

**physics**

A person walks first at a constant speed of 5.10 m/s along a straight line from point circled A to point circled B and then back along the line from circled B to circled A at a constant speed of 3.15 m/s.(a) What is her average speed over the entire trip? How can I find the ...
*Wednesday, January 21, 2015 by Leah*

**Physics**

Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 5 m/s2 for 4.2 seconds. It then continues at a constant speed for 11.1 seconds, before applying the brakes such that the car...
*Wednesday, January 21, 2015 by Isaiah*

**physics**

Consider a thin spherical shell of radius 20.2cm with a total charge of 3.3μC distributed uniformly on its surface. a) Find the electric field, in N/C, at a radius of 15.6cm from the center of the charge distribution. b) Find the electric field, in N/C, at a radius of 27....
*Wednesday, January 21, 2015 by Lauren*

**physics**

A train whistle is heard at 280Hz 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 270 Hz. What is the speed of the train before slowing down? What is the speed of the train after slowing down?
*Wednesday, January 21, 2015 by henry*

**Physics**

Chinook salmon are able to move through water especially fast by jumping out of the water periodically. This behavior is called porpoising. Suppose a salmon swimming in still water jumps out of the water with velocity 6.41 m/s at 44.1° above the horizontal, sails through ...
*Wednesday, January 21, 2015 by Blake*

**physics**

The following charges are located inside a metallic container on unknown shape: 5.00 μC, -4.60 μC, 67.0 μC, and -50.0 μC. Calculate the net electric flux, in Nm2/C, through the container
*Wednesday, January 21, 2015 by Lauren*

**physics**

A proton is placed at rest in an electric field of 515 N/C. Calculate the speed of the proton 36.0 ns after being released
*Wednesday, January 21, 2015 by Linda*

**physics**

An object having a net charge of 18.2 μC is placed in a uniform electric field of 790 N/C directed vertically upward, i.e. in the direction opposite gravity. What is the mass, in grams, of this object if it "floats" in the field? (Assume g = 9.80 m/s2.)
*Wednesday, January 21, 2015 by Serena*

**Physics **

When will the resultant of the 5N and 7N be at a maximum?
*Wednesday, January 21, 2015 by Owami *

**physics**

Suppose that you balance a 5 kg ball on the tip of your finger that has an area of 1 cm2. What is the pressure on your finger?
*Wednesday, January 21, 2015 by Kareem*

**physics**

A rectangular barge floats in freshwater. When a 400 kg block is loaded on the 5 m long by 2 m wide barge, the barge sinks a few centimeters deeper. How much deeper does the barge lower?
*Wednesday, January 21, 2015 by Kareem*

**physics**

A lead ball of mass 60kg hangs from a string. A piece of putty mass of 15kg hits the ball with velocity of 12m/s. If the putty sticks to the ball, what will be their velocity immediately after the impact?
*Wednesday, January 21, 2015 by Momentum*

**physics **

5. An object is dropped. If one could neglect air resistance a. what would its velocity (magnitude and direction) be after 1 s? b. what would its displacement (magnitude and direction) be after 1 s?
*Wednesday, January 21, 2015 by Anonymous*

**physics**

You set your stationary bike on a high 80 N friction like resistive force and cycle for 30 min at speed of 8 m/s. Your body is 10% efficient at converting chemical energy in your body into mechanical work. What is your internal chemical energy change? How long must you bike to...
*Tuesday, January 20, 2015 by bill*

**Physics**

mrubber stopper = 0.07Kg mmetal washers = 0.196Kg radius = 1.0m total time = 12 seconds # of revolutions = 10 revolutions With this data, calculate the centripetal Force (Fc) (to 2 decimals) of the rubber stopper in its "orbit".
*Tuesday, January 20, 2015 by Brooke*

**Physics**

mass rubber stopper = 0.07Kg mass metal washers = 0.196Kg radius= 1.0m total time = 12 seconds # of revolutions = 10 revolutions With this data, calculate the Period (T) of the rubber stopper in its "orbit".
*Tuesday, January 20, 2015 by Brooke*