Monday
October 20, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
A 27.9 kg block (m1) is on a horizontal surface, connected to a 5.3 kg block (m2) by a massless string. The pulley is massless and frictionless. A force of 239.3 N acts on m1 at an angle of 28.9°. The coefficient of kinetic friction between m1 and the surface is 0.181. ...
Monday, October 20, 2014 at 9:55am

Physics
A 4.58 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 10.5 N at an angle theta = 25.5° above the horizontal. The coefficient of kinetic friction between the block and the floor is 0.09. What distance does the block travel in a time of 5....
Monday, October 20, 2014 at 9:48am

physics
100 kg jeepney is at reast on a bridge 5m from the right end, neglecting the weight of the bridge. find f1 and f2
Monday, October 20, 2014 at 8:26am

physics
how many kcals are required to cool one gallon/liter of water from 32degrees celcius to 7 degrees celcius?
Monday, October 20, 2014 at 7:12am

physics
a point charge q is located btween two earthed intersecting conducting planes that are inclined at 60 degree to each other .determine the number of image charges and their location .
Monday, October 20, 2014 at 7:08am

physics
Car A uses tires for which the coefficient of static friction is 0.333 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 13.8 m/s. Car B uses tires for which the coefficient of static friction is 0.843 on the same curve. What is the...
Monday, October 20, 2014 at 3:29am

physics
The mass of the sled and its two riders in Figure 5.5 is 243 kg. Find the magnitude of the centripetal force that acts on the sled during the turn with a radius of (a) 33.0 m and (b) 24.0 m.
Monday, October 20, 2014 at 2:00am

Physics: mechanics
A 250g bullet with a speed of 500m/s passes through the center of a 1.5kg square wooden block [ side length 18cm] at rest upon a horizontal frictionless surface. As it exits the block, the bullet has a speed of 150m/s. A) find the initial speed of the center of mass of the ...
Monday, October 20, 2014 at 1:15am

physics
An object slides on a level surface in the +x direction. It slows and comes to a stop with a constant acceleration of -2.45 m/s2. What is the coefficient of kinetic friction between the object and the floor? (please include explanation)
Monday, October 20, 2014 at 1:04am

physics
A 2.44 kg object is subjected to three forces that give it an acceleration vector a = -(8.00 m/s2)i hat + (6.00 m/s2)j hat. If two of the three forces are vector F1 = (30.7 N)i hat + (17.0 N)j hat and vector F2 = -(12.0 N)i hat + (8.00 N)j hat, find the third force.
Sunday, October 19, 2014 at 10:28pm

Physics
Starting from rest, a 98-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 700 N, and his speed at the bottom of the pole is 3.4 m/s. How far did he slide down the pole?
Sunday, October 19, 2014 at 10:13pm

physics
In a cargo plane, the center of gravity must be between the front and rear landing gears in order to maintain a torque equilibrium. The front landing gears help counteract the torque provided by the rear landing gears in this case. A jet transport has a weight of 1.00 ✕...
Sunday, October 19, 2014 at 10:11pm

physics
what is the physics answer to A 25.0 kg mortar shell is launched from level ground at 38.0m/s at 60 Degrees above the horizontal. At the top of its trajectory, the shell explodes into three pieces. A 10.0 kg piece flies forward at 38.0 m/s. Another 10.0 kg piece flies straight...
Sunday, October 19, 2014 at 10:09pm

physics
The distance between two consecutive nodes of a standing wave is 19.2 cm. The hand gen- eratingthe pulses movesupand downthrough a complete cycle 3.23 times every 5.9 s. Find the velocity of the wave. Answer in units of m/s how do I solve it? thanks!
Sunday, October 19, 2014 at 10:01pm

Physics
A ball with mass m = 0.210 kg and kinetic energy K1 = 2.97 J collides elastically with a second ball of the same mass that is initially at rest. After the collision, the first ball moves away at an angle of = 30.6° with respect to the hori- zontal, as shown in the figure. ...
Sunday, October 19, 2014 at 8:56pm

Physics
A ball with mass m = 0.210 kg and kinetic energy K1 = 2.97 J collides elastically with a second ball of the same mass that is initially at rest. After the collision, the first ball moves away at an angle of = 30.6° with respect to the hori- zontal, as shown in the figure. ...
Sunday, October 19, 2014 at 8:44pm

Physics!
A 0.0124-kg bullet is fired straight up at a falling wooden block that has a mass of 3.96 kg. The bullet has a speed of 756 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the ...
Sunday, October 19, 2014 at 8:36pm

Physics
  Block A and block B are forced together, compress- ing a spring (with spring constant k = 2500. N/m) between them 3.00 cm from its equilibrium length. The spring, which has negligible mass, is not fastened to either block and drops to the surface after it has expanded...
Sunday, October 19, 2014 at 8:06pm

physics
How far from a piece of paper must you hold your father’s 2.00 D reading glasses to try to burn a hole in the paper with sunlight?
Sunday, October 19, 2014 at 6:39pm

physics
In a game of shuffleboard, a disk with an initial speed travels of 3.2m/s travels 6.0m (a) what is the acceleration of the disk? (b) what is the coefficient of friction between the floor and the disk? So far I've gotten to the equation vf^2 - vi^2 = 2a(xf-xi) because time ...
Sunday, October 19, 2014 at 6:27pm

physics
A gardener pushes a box of tools across a driveway by applying a 27.5- N force that pushes downward at an angle of 32.8 o with respect to the horizontal. How much work is done if the box moves 3.25 m in the horizontal direction?
Sunday, October 19, 2014 at 6:21pm

Physics 12
the 3 forces shown act on a object is in equilibrium. F1= 50N (E 60 degrees N), F2= 60N (E 30 degrees S ) Calculate the magnitude of the force F3 and the angle???? How to solve??
Sunday, October 19, 2014 at 6:19pm

physics
The distance between two nearest nodes of a standing wave is 22.9 cm. Hand generated pulses move up and down through a complete cycle five times every seven seconds. Find the velocity of the wave. Answer in units of m/s
Sunday, October 19, 2014 at 5:18pm

Physics
In a science fiction novel two enemies, Bonzo and Ender, are fighting in outer spce. From stationary positions, they push against each other. Bonzo flies off with a velocity of +2.2 m/s, while Ender recoils with a velocity of -2.9 m/s. Determine the ratio mBonzo/mEnder of the ...
Sunday, October 19, 2014 at 5:18pm

Physics
Consider a rod plus disc system. The rod has a total length L =1.30 m, while the disc has a radius of R = L/2. The pivot is at P where the distance between P and the end of the rod is L/4. Point O is at the center of the disc, and the distance between O and P is 0.975 m. The ...
Sunday, October 19, 2014 at 5:13pm

physics
Given. a = 25.1 cm and b = 51.2 cm and the forces are F1 = 10.3 N, F2 = 10.6 N and F3 = 14.7 N. The angle between F2 and the horizontal is θ = 27.9 °. Find the magnitude of the net torque on the wheel about the axle through O. Answer in units of N m.
Sunday, October 19, 2014 at 5:00pm

Physics fun
A golf ball strikes a hard, smooth floor at an angle of 33.1 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.0172 kg, and its speed is 59.2 m/s just before and after striking the floor. What is the magnitude of the impulse applied to the ...
Sunday, October 19, 2014 at 4:39pm

Physics updated
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 65.3-kg man just before contact with the ground has a speed of 7.05 m/s. (a) In a stiff-legged ...
Sunday, October 19, 2014 at 4:20pm

Physics
A long solenoid has 1400 turns per meter of length, and it carries a current of 2.0 A. A small circular coil of wire is placed inside the solenoid with the normal to the coil oriented at an angle of 90.0˚ with respect to the axis of the solenoid. The coil consists of 46 ...
Sunday, October 19, 2014 at 4:01pm

Physics
A solid bar of length L = 1.32 m has a mass m1 = 0.751 kg. The bar is fastened by a pivot at one end to a wall which is at an angle θ = 35.0 ° with respect to the horizontal. (in other words, the angle between the wall and the beam is 35 degrees).The bar is held ...
Sunday, October 19, 2014 at 3:59pm

Physics!
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 79.1 kg man just before contact with the ground has a speed of 6.27 m/s. In a stiff-legged landing...
Sunday, October 19, 2014 at 3:55pm

Physics
Betty Bodycheck (mB = 55 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 45 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a direction that is 76.0° ...
Sunday, October 19, 2014 at 3:25pm

Physics
Betty Bodycheck (mB = 55 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 45 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a direction that is 76.0° ...
Sunday, October 19, 2014 at 3:06pm

physics
an airplance traveling at 450 km/h needs to reverse its course. the pilot decides to bank the wings at 12 degrees. find the time needed to reverse the course
Sunday, October 19, 2014 at 3:04pm

physics
Water is poured into a container that has a leak.The mass 'm' of the water is given as a function of time 't' by, m=5t^0.8 -3t + 20 , with t>=0, mass in grams and t in seconds A) at what time is the water mass greatest,and B) what is the greatest mass? In ...
Sunday, October 19, 2014 at 3:00pm

Physics
A soccer player extends her lower leg in a kicking motion by exerting a force with the muscle above the knee in the front of her leg. Suppose she produces an angular acceleration of 28.5 rad/s2 and her lower leg has a moment of inertia of 0.7 kg⋅m2. What is the force, in...
Sunday, October 19, 2014 at 2:43pm

PHYSICS
A BALL IS DROPPED A HEIGHT AT THE SAME TIME AS ANOTHER BALL IS PROJECTED HORIZONTALLY FROM THE SAME HEIGHT. 1.WILL THE BALLS HIT THE GROUND AT THE SAME TIME. 2.EXPLAIN YOUR ANSWER IN (1).
Sunday, October 19, 2014 at 2:25pm

Physics
At the 2014 ALCS game 2, the Royals started their right-handed pitcher Wade Davis whose fastball typically reaches 94 mph. if his throwing motion covers 2.8m from the position where his arm starts to make forward motion to release position, and the mass of the ball is 0.5lbs...
Sunday, October 19, 2014 at 12:31pm

Physics
A satellite in circular orbit around the earth has an orbital speed of 5 km/s. What is the period of the orbit? Assume the mass of the Earth is 5.98e24 kg.
Sunday, October 19, 2014 at 12:25pm

Physics
A lead bullet is traveling at 200 m/s strikes a tree and comes to stop. If half of the heat produced is retained by the bullet, by how much does the temperature increase?
Sunday, October 19, 2014 at 10:32am

physics
a soldier climbs a cliff with a pull of 750N on the rope and th rope is 22 degrees to the cliff . how much is he pulling.'
Sunday, October 19, 2014 at 6:34am

Physics
A total of 0.800 kg of water at 20 degrees celsius is places in a 1kw electric kettle. How long a time is needed to raise the temperture of water to 100 degrees celsius?
Sunday, October 19, 2014 at 2:45am

Physics
Just after hitting the runway, a plane has a speed of 200.0 km/h. The plane decelerates to a stop at a constant rate. a. What is its average speed on the runway in m/s? b. If the plane takes 21 seconds to come to a stop, how much of the runway does it cover during its ...
Saturday, October 18, 2014 at 9:39pm

physics
What is the velocity of the fallen ball that has 5kg
Saturday, October 18, 2014 at 9:14pm

physics
A triple beam balance, like the scales we use every week in lab, works using rotational equilibrium. If a 253 g mass is placed on the pan, 1 cm from the pivot, and there are three masses, 1 g, 10 g, and 50 g masses on the other side can be slid back and forth between 0 cm and ...
Saturday, October 18, 2014 at 8:54pm

Physics
The blades of a ceiling fan have a radius of 0.393 m and are rotating about a fixed axis with an angular velocity of +1.36 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 1.82 rad/s2. After 0.475 s have elapsed since...
Saturday, October 18, 2014 at 8:40pm

Physics
A top is a toy that is made to spin on its pointed end by pulling on a string wrapped around the body of the top. The string has a length of 54 cm and is wound around the top at a spot where its radius is 2.2 cm. The thickness of the string is negligible. The top is initially ...
Saturday, October 18, 2014 at 8:39pm

physics
How far from a piece of paper must you hold your father’s 2.00 D reading glasses to try to burn a hole in the paper with sunlight?
Saturday, October 18, 2014 at 8:24pm

physics
Traveling at a speed of 12.1 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.42 s have elapsed? Ignore the effects of ...
Saturday, October 18, 2014 at 7:46pm

math
I'm wonder if im correct? Two physics students built a model rocket for a class project. Once the rocket is launched, its height in feet, h(t), can be found using the height function h(t) = -16t² + 96t where t represents time in seconds my work: 0=-16t^2+96t = -16t(t-...
Saturday, October 18, 2014 at 5:17pm

Physics
Mike is piloting a lear jet traveling at 199.0 m/s. He accelerates at 8.5 m/s2 over a distance of 2240 meters. How fast will the jet be moving at the end of this acceleration?
Saturday, October 18, 2014 at 4:23pm

Physics
Sanjay's air boat starts from rest and accelerates at 8.7 m/s2 for a distance of 176 meters. How fast is it moving at the end of the 176 meters?
Saturday, October 18, 2014 at 4:18pm

PHYSICS 1301 (COLLEGE)
As shown in the figure below, two masses m1 = 4.10 kg and m2 which has a mass 50.0% that of m1, are attached to a cord of negligible mass which passes over a frictionless pulley also of negligible mass. If m1 and m2 start from rest, after they have each traveled a distance h...
Saturday, October 18, 2014 at 3:13pm

PHYSICS 1301 (COLLEGE)
A box of unknown mass is sliding with an initial speed vi = 5.10 m/s across a horizontal frictionless warehouse floor when it encounters a rough section of flooring d = 4.20 m long. The coefficient of kinetic friction between the rough section of flooring and the box is 0.100...
Saturday, October 18, 2014 at 2:38pm

physics
A child does 350 J of work while pulling a box from the ground up to his tree house with a rope. The tree house is above the ground. What is the mass of the box?
Saturday, October 18, 2014 at 1:26pm

physics
Traveling at a speed of 19.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.21 s have elapsed? Ignore the effects of...
Saturday, October 18, 2014 at 11:38am

physics please help
A drum (see Figure 10.2) has a radius of 0.40 m and a moment of inertia of 2.3 kg ∙ m2. The frictional torque of the drum axle is A 14 m length of rope is wound around the rim. The drum is initially at rest. A constant force is applied to the free end of the rope until ...
Saturday, October 18, 2014 at 10:44am

Physics
Nothing in my physics book addresses this question. Can someone please help?? Two ice skaters, with masses of 69kg and 47kg , stand facing each other on a 19-m-wide frozen river. The skaters push off against each other, glide backward straight toward the river's edges, and...
Saturday, October 18, 2014 at 10:11am

Physics
Please help!! I know how to work the problem to find velocities, but this one has me stumped! A 2.0kg block slides along a frictionless surface at 1.0m/s . A second block, sliding at a faster 4.4m/s , collides with the first from behind and sticks to it. The final velocity of ...
Saturday, October 18, 2014 at 10:09am

physics
A body of mass 4 kg is dropped from a height of 20m .calculate the initial momentum and the momentum just before it strikes the ground (g=10m/s*s)
Saturday, October 18, 2014 at 9:40am

physics
Consider a c-Si solar cell whose fingers have a resistance R=0.1Ω. What would be the finger's resistance (in Ω) if the finger's width is doubled and the finger's height is one third of its initial value?
Saturday, October 18, 2014 at 8:15am

physics
a person of mass 80 kg standing on a boat of mass 320 kg which at rest in still water the person is initially 12m from the shore the person walk on boat for 6 sec with a constant speed 1 m/s toward the shore and then stop distance of the person from the shore finally
Saturday, October 18, 2014 at 8:07am

physics
Vector A is 10 unit longs and points at 25 degree above the positive x axis. Another vector B is 8 units long and points along yhe positive x axis. Determine the magnitude of A X B.
Saturday, October 18, 2014 at 4:32am

physics
A block of mass m is pushed along a horizontal table by a force F= 70 N a an angle 55 degrees with the horizontal. The coefficient of kinetic friction is 0.3 Write Newtons second law using vectors. Write newtons second law using x scalar components
Friday, October 17, 2014 at 10:03pm

physics
A laser that emits pulses of UV lasting 2.95 ns has a beam diameter of 4.05 mm. If each burst contains an energy of 4.60 J, what is the length in space of each pulse? What is the average energy per unit volume (the energy density) in one of these pulses?
Friday, October 17, 2014 at 9:59pm

Physics
A bullet is fired from a rifle that is held 2.5 m above the ground in a horizontal position. The initial speed of the bullet is 1450 m/s. Find: (a) the time it takes for the bullet to strike the ground and (b) the horizontal distance traveled by the bullet.
Friday, October 17, 2014 at 9:39pm

Physics
A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 720 m/s. The barrel is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.031 m below the center. What is the horizontal distance between the end of the ...
Friday, October 17, 2014 at 9:38pm

Physics
A marble rolls off a lab table that is 0.92 m high. It rolls off the table with a velocity of 1.66 m/s. How far from the base of the table must the chip be placed so that the marble will hit the chip?
Friday, October 17, 2014 at 9:37pm

Physics Help Please!!!! Check!
if I weigh N on Earth and 5320 N on the surface of a planet, what is the acceleration due to gravity on that planet? mg=702N m=702/9.8=71.6 kg mg=5320N g=5320/71.6=74.3 m/s^2
Friday, October 17, 2014 at 9:28pm

physics
A mass of 3.25 kg is attached to the end of a spring that is stretched 20 cm by a force of 14 N. It is set in motion with an initial position x_0 = 0 and initial velocity (in m/s) v_0 = -11. Find the amplitude, period, and frequency of the resulting motion. You should assume ...
Friday, October 17, 2014 at 8:43pm

Physics
A block of mass 0.40 kg rests on the inclined surface of a wedge of mass 7.0 kg. The wedge is acted on by a horizontal force F with arrow and slides on a frictionless surface. a)If the coefficient of static friction between the wedge and the block is µs = 0.30, and the ...
Friday, October 17, 2014 at 7:21pm

physics
During a baseball game, a batter hits a high pop-up. If the ball remains in the air for 6.65 s, how high does it rise? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m CAN ANYONE HELP PLEASE ??????!!!
Friday, October 17, 2014 at 6:38pm

Physics
You are making a trip in a space shuttle, and your friend Jimmy is in another space shuttle. He shares the same circular orbit with you, 370 km above earth. However, he is 21 km ahead of you. A) How long will it take you to catch up with your friend if you reduce your orbital ...
Friday, October 17, 2014 at 6:13pm

Physics
Consider the skateboarder in the figure below. If she has a mass of 57 kg, an initial velocity of 21 m/s, and a velocity of 10 m/s at the top of the ramp, what is the work done by friction on the skateboarder? Ignore the kinetic energy of the skateboard's wheels. The ...
Friday, October 17, 2014 at 6:02pm

Physics
(a) How high a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 96.0 km/h? (b) If, in actuality, a 750 kg car with an initial speed of 96.0 km/h is observed to coast up a hill to a height 18.0 m above its starting point, how much ...
Friday, October 17, 2014 at 5:49pm

physics
a turntable rotates about a fixed axis, making one revolution in 10s . the moment of inertia of the turntable about it's axis is 1200kg/m^2 . a man of mass 80kg , initially standing at the center of the turntable, runs out along a radius. what is the angular velocity of ...
Friday, October 17, 2014 at 5:47pm

Physics
A mass of 14 kg is moving at a speed of 39 m/s at the bottom of incline which is inclined at an angle of 51.6 degrees. The incline has friction and the coefficient of kinetic friction is 0.6. The mass travels up the incline and stops due to both gravity and friction and then ...
Friday, October 17, 2014 at 5:27pm

Physics
Spark timer acceleration lab How do you determine the acceleration from the slope of your best fit line?
Friday, October 17, 2014 at 5:15pm

physics
A man on the moon throws a ball vertically upwards and it is notices that the ball travels 3.0m less in the fifth second of its upward motion that it does in the third second. What is the acceleration due to gravity on the moon?
Friday, October 17, 2014 at 2:56pm

physics
Find the height of a hot air balloon if an object which falls from it covers 19% of the height in the last second of its fall.
Friday, October 17, 2014 at 2:52pm

Physics
A golfer hits a shot to a green that is elevated 3.10 m above the point where the ball is struck. The ball leaves the club at a speed of 19.4 m/s at an angle of 33.0˚ above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
Friday, October 17, 2014 at 2:28pm

physics
A golfer hits a shot to a green that is elevated 3.10 m above the point where the ball is struck. The ball leaves the club at a speed of 19.4 m/s at an angle of 33.0˚ above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
Friday, October 17, 2014 at 1:40pm

Physics/ Biomechanics
Compare the vertical jump heights obtained using the vertical velocity at take off and half the flight time. Which one do you think is more accurate in assessing a vertical jump performance? - my vertical jump height using vertical velocity at take off = 0.28m - my vertical ...
Friday, October 17, 2014 at 12:53pm

physics
What would it mean if mu is greater than one?
Friday, October 17, 2014 at 11:33am

physics
a foot ball is thrown upward with an angle of 30 degree with respect to the horizantal .to throw a 40meter pass what must be the intial speed of the ball?
Friday, October 17, 2014 at 9:52am

Physics
a person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 10 m/s. the cliff is 48 m above the water's surface as shown. how long does it take for the stone to fall to the water? the acceleration of gravity is 9.81 m/s2. answer in units of s
Friday, October 17, 2014 at 9:34am

Physics
help. A rescue helicopter drops a package of emergency ration to a stranded party on the ground. If the helicopter is traveling horizontally at 40m/sec at a height of 100 m above the ground, where does the package strike the ground relative to the point at which it was ...
Friday, October 17, 2014 at 8:54am

Physics
A charge of +2uC is placed at one end of a meter stick, a charge of -2uC is placed at the other end. Calculate the electric field strength at the 50 cm mark
Friday, October 17, 2014 at 7:56am

Physics
An object slides down an inclined plane of initial height of 30m.its velocity at the foot of the plane is 20m..find the fraction of the initial potential energy which is dissipated as heat
Friday, October 17, 2014 at 6:04am

physics laws of motion
a block of mass 300kg is set into motion on a frictionless horizantal surface with help of frictionless pulley and a rope system.what horizantal force F should be applied to produce an acceleration of 1m/s in block
Friday, October 17, 2014 at 2:59am

physics
A block of mass m1 = 2.4 kg slides along a frictionless table with a speed of 8 m/s. Directly in front of it, and moving in the same direction, is a block of mass m2 = 5.0 kg moving at 2.8 m/s. A massless spring with spring constant k = 1140 N/m is attached to the near side of...
Friday, October 17, 2014 at 1:43am

physics
At a distance of 1 cm from the source, the flux from the isotropic source is one hundred times brighter. Which source is brighter fifty centimeters away? At what distance from the source are the two equally bright? Could you explain the theory behind the answers too? Isn't...
Friday, October 17, 2014 at 1:22am

physics
A 2.3 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 111 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. See below. What is its potential energy after it has swung to ...
Thursday, October 16, 2014 at 11:09pm

physics
Determine whether each statement below is true or false. The force necessary to lift an object is its mass times g. Kinetic energy is the energy of motion. Stopping distance is doubled, if speed is doubled. Work is the product of force and time. A joule is a newton times a ...
Thursday, October 16, 2014 at 11:07pm

physics
A bow with a spring constant of 398 N/m has an arrow placed in it and pulled back a distance of 0.6 m. If the arrow is shot straight up in the air how high will it go? Assume the mass of the arrow is 0.16 Kg.
Thursday, October 16, 2014 at 11:05pm

physics
A 63.8 kg woman lifts herself 36.6 cm each time she does a chin-up. What force does she exert in lifting herself to the chin position? And, how much positive work does she do in pulling herself up once?
Thursday, October 16, 2014 at 11:02pm

physics
An aluminum wire has resistance of per meter and carries a current If the power dissipated is find the electric field within the wire
Thursday, October 16, 2014 at 10:53pm

physics
A boy runs 18.4 blocks North, 12.9 blocks Northeast, and 19.7 blocks West. a)Determine the length of the displacement vector that goes from the starting point to his final position. b)Determine the direction of the displacement vector. Use counterclockwise as the positive ...
Thursday, October 16, 2014 at 10:38pm

Physics
A skateboarder moving at 7.18 m/s along a horizontal section of a track that is slanted upward by 48.5 ° above the horizontal at its end, which is 0.741 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring ...
Thursday, October 16, 2014 at 10:22pm

physics asap!!! thank you
A boy runs 18.4 blocks North, 12.9 blocks Northeast, and 19.7 blocks West. a)Determine the length of the displacement vector that goes from the starting point to his final position. b)Determine the direction of the displacement vector. Use counterclockwise as the positive ...
Thursday, October 16, 2014 at 10:18pm

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