Wednesday

January 28, 2015

January 28, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**PHYSICS**

last homework question I cannot figure out.... H E L P :} a bullet is fired at and passes a piece of target paper suspended by a massless string. The bullet has a mass of m, a speed v before the collision with the target, and a speed (0.466)v after passing through the target. ...
*Sunday, November 2, 2014 at 6:45pm*

**Physics**

As shown in the figure below, a bullet is fired at and passes a piece of target paper suspended by a massless string. The bullet has a mass of m, a speed v before the collision with the target, and a speed (0.466)v after passing through the target. The collision is inelastic ...
*Sunday, November 2, 2014 at 6:28pm*

**physics**

find the mass of a ball on a roof 30 meters high, if the ball's gravitational energy is 58.8 joules.
*Sunday, November 2, 2014 at 6:27pm*

**physics**

A projectile is fired at 12.5 m/s at an angle of 53.1 with the horizontal from a point 75m above the ground. A) How long does it take to reach the ground? B)What max height does it reach? C) What horizontal distance does it travel before striking the ground? D) With what ...
*Sunday, November 2, 2014 at 6:06pm*

**physics **

The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 45.7 cm and a mass of 9.1kg. How many revolutions did one of the front tires (assuming only the back tires spun upon ...
*Sunday, November 2, 2014 at 5:49pm*

**physics **

The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 45.7 cm and a mass of 9.1kg. How many revolutions did one of the front tires (assuming only the back tires spun upon ...
*Sunday, November 2, 2014 at 5:42pm*

**physics**

A car weighing 1.0 x 10^4N is parked on a 34 degree slope. The brakes fail and the car starts to slide down the hill. Assume no friction. Show your work, and determine a) the acceleration of the car, and b) after it has moved 28.0 m, how fast is it moving?
*Sunday, November 2, 2014 at 4:38pm*

**Physics**

a place kicker must kick a football from a Lint 36 meters from the goal. As a result of the kick, the ball must clear the crossbar, which is 3.04 meters high. When kicked, the ball leaves the ground with a speed of 20 meters per second at an angle of 50 degrees to the ...
*Sunday, November 2, 2014 at 4:15pm*

**physics**

a projectile is fired at 50 meters per second at an angle of 30 degrees below the horizontal off a cliff that is 50 meters high. How far away and at what speed and angle will this projectile land?
*Sunday, November 2, 2014 at 4:10pm*

**Physics**

A block M1 of mass 13.0 kg sits on top of a larger block M2 of mass 23.0 kg which sits on a flat surface. The kinetic friction coefficient between the upper and lower block is 0.440. The kinetic friction coefficient between the lower block and the flat surface is 0.140. A ...
*Sunday, November 2, 2014 at 3:27pm*

**physics**

A space station Radar locates sattelites A and B at a certain moment: A_0=(a_1,0,1^3), B_0=(0,b_2,b_3) the space station is located at (0,0,0) and the sattelites moves with a uniform velocity related to the space station: v_A=(V_A,0,0), v_B=(V_B,V_B,0) what is the minimal ...
*Sunday, November 2, 2014 at 2:32pm*

**physics**

What is the cause of esacape velocity
*Sunday, November 2, 2014 at 1:08pm*

**physics**

How can the equation be prove:maximum height,time of flight and maximun range in projectile?
*Sunday, November 2, 2014 at 12:42pm*

**physics**

A bus moves from rest with a uniform acceleration of 2ms(square)for the first 10s.
*Sunday, November 2, 2014 at 12:33pm*

**Physics**

An ant climbs onto the side of a bicycle tire a distance of 40.0 m from the hub. If the 0.010 g ant can hold onto the tire with a force of 4.34*10 to the -4, at what frequency would the tire fling the ant of assuming the wheel is spun on a horizontal plane? so what I did for ...
*Sunday, November 2, 2014 at 11:09am*

**Physics**

Determine Centripetal Acceleration acting on the person standing at the equator? (the radius of earth is given)
*Sunday, November 2, 2014 at 11:03am*

**physics**

During burnouts at the local drag strip, a dragster’s 45.0kg tire rotates at a speed of 35.0m/s. If the tire has a radius of 0.500m what is the centripetal force acting on the center of the tire rim during this burnout?
*Sunday, November 2, 2014 at 10:12am*

**Physics**

Two forces are applied to a car in an effort to accelerate it, as shown below. The first force, F1 = 328 N, is applied at an angle α = 35° to the forward dashed line. The second force, F2 = 464 N, is applied at an angle β = 13° to the forward dashed line. (a...
*Sunday, November 2, 2014 at 9:51am*

**Physics**

A laser source emits lights of wavelength 62100m and has an output of 35mW calculate how many photons are emitted per minute by this laser sourse
*Sunday, November 2, 2014 at 9:43am*

**Physics**

When maximum power is transferred to an external resistor R by a battery of emf E and internal resistance r, the ratio of r/R is? Answer 1:1 Can some please explain? Thankkks!
*Sunday, November 2, 2014 at 8:49am*

**physics**

a 1500kg car travelling east with a speed of 20m/s collides at an intesection with a 2500kg van travelling south at a speed of 15m/s.The vehicle undergoes a perfectly inelastic collision, and the wreckage slides 6m before coming to rest.Find the magnitude and direction of the ...
*Sunday, November 2, 2014 at 3:59am*

**physics**

a wheel 0.45m in diameter starts from rest and rotates with uniform acceleration to 6000 radians per minute in a time of 4s.Find angular acceleration of the wheel and speed of a point on the rim at end of 4s =w/t
*Sunday, November 2, 2014 at 3:49am*

**physics **

A cylindrically shaped space station is rotating about the axis of the cylinder to create artificial gravity. The radius of the cylinder is 159 m. The moment of inertia of the station without people is 4.23 x 109 kg·m2. Suppose 299 people, with an average mass of 67.0 ...
*Sunday, November 2, 2014 at 1:04am*

**physics**

a warehouse employee is pushing a 38 kg desk across a floor at a constant speed of 0.4 m/s. How much work must the employee do on the desk to change the speed of 1.5m/s?
*Sunday, November 2, 2014 at 1:34am*

**Physics **

A bowling ball encounters a 0.760-m vertical rise on the way back to the ball rack, as the drawing illustrates. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. The translational speed of the ball is 7.83 m/s at the bottom of the rise. ...
*Sunday, November 2, 2014 at 12:45am*

**physics, math**

A hot air balloon with a mass of 18.0 kg is accelerating upward at 1.80 m/s^2 (Anet = 1.80 m/s^2). What is the weight and buoyant force acting on the balloon?
*Saturday, November 1, 2014 at 10:05pm*

**Physics**

What is the maximum speed of a 3.40g particle that oscillates between x =2.0mm and x =8.0mm in the figure? (Figure 1) Description of Figure: Parabola with the lowest point at (4,1) parabola starts at(2,5) and ends at (8,5) Y-axis is U(J) X-axis is x(mm)
*Saturday, November 1, 2014 at 9:55pm*

**physics**

An m=150 g block hits an M= 265 g block initially at rest on a horizontal surface. After impact they stick together and slide 7.47 m before coming to rest. The coefficient of friction between blocks and surface is 0.39. a) What is in m/s the speed of both blocks immediately ...
*Saturday, November 1, 2014 at 9:54pm*

**Physics**

What is the maximum speed of a 3.40g particle that oscillates between x =2.0mm and x =8.0mm in the figure? (Figure 1) Description of Figure: Parabola with the lowest point at (4,1) parabola starts at(2,5) and ends at (8,5) Y-axis is U(J) X-axis is x(mm)
*Saturday, November 1, 2014 at 8:34pm*

**Physics**

A bowling ball encounters a 0.760 m vertical rise on the way back to the ball rack, as the drawing illustrates. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. The translational speed of the ball is 5.40 m/s at the bottom of the rise. ...
*Saturday, November 1, 2014 at 7:50pm*

**Physics**

1.71 kg of glass (ρ = 2.66 x 10^3 kg/m3) is shaped into a hollow spherical shell that just barely floats in water. What are the (a) outer and (b) inner radii of the shell? Do not assume the shell is thin. Volume = 2.66 * 10^3/1.71 V=1555.56 m^3 V=pi(r^2)h
*Saturday, November 1, 2014 at 6:27pm*

**Physics**

The colors we see when looking at an object depend on the _________. A) density of the object B) amplitude of the light we see C) frequency of the light we see D) mass of the object we are looking at I think it is A
*Saturday, November 1, 2014 at 5:33pm*

**Physics**

You swing a 2.40kg stone in a circle, using the full length of a thin 60.0cm rope.
*Saturday, November 1, 2014 at 2:31pm*

**Physics**

A car is traveling along a road, and its engine is turning over with an angular velocity of +190 rad/s. The driver steps on the accelerator, and in a time of 13.0 s the angular velocity increases to +300 rad/s. (a) What would have been the angular displacement of the engine if...
*Saturday, November 1, 2014 at 2:11pm*

**physics**

A dart is thrown horizontally toward X at 30 m/s as shown. It hits Y 0.29 s later. The distance XY in centimeters is:
*Saturday, November 1, 2014 at 1:47pm*

**physics**

A 75 kg hockey player glides across the ice on his skates with steel blades. What is the magnitude of the force of friction acting on the skater?
*Saturday, November 1, 2014 at 11:18am*

**Physics**

Three particles X, Y, and Z of masses 2 kg, 5 kg, and 4 kg respectively are arranged in order along a straight line. Y is 5.0 m from X and 7.0 m from Z. The distance of the centre of mass of the system of mass from X is? ANS: 6.6 m Help please? I dont even know how to start :(
*Saturday, November 1, 2014 at 8:57am*

**Physics**

A 56kg student is standing atop a spring in an elevator that is accelerating upward at 3.1m/s2 . The spring constant is 2100N/m . By how much is the spring compressed?
*Friday, October 31, 2014 at 11:55pm*

**physics**

The car stationary in front of a red traffic light. As the light turns green , a truck goes past at a constant velocity of 1.5 m/s. At the same moment , the car begins to accelerate at 1.25 m/s 2 . When it reaches 2.5 m/s the car continues at this velocity . When does the car ...
*Friday, October 31, 2014 at 11:36pm*

**physics**

The car stationary in front of a red traffic light. As the light turns green , a truck goes past at a constant velocity of 1.5 m/s. At the same moment , the car begins to accelerate at 1.25 m/s 2 . When it reaches 2.5 m/s the car continues at this velocity . When does the car ...
*Friday, October 31, 2014 at 11:32pm*

**physics**

A rifle fires a 1.27 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 7.87 x 10-2 m from its unstrained length. The pellet rises to a maximum ...
*Friday, October 31, 2014 at 11:16pm*

**physics**

An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. The speeds of sound in air, water, and the handrail are 356, 1460, and 5400 m/s, respectively. The sound ...
*Friday, October 31, 2014 at 10:58pm*

**physics**

A rifle fires a 1.27 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 7.87 x 10-2 m from its unstrained length. The pellet rises to a maximum ...
*Friday, October 31, 2014 at 10:14pm*

**Physics**

A block of mass m = 3.65 kg is attached to a spring (k = 27.5 N/m) by a rope that hangs over a pulley of mass M = 7.30 kg and radius R = 2.81 cm, as shown in the figure. a) Treating the pulley as a solid homogeneous disk, neglecting friction at the axle of the pulley, and ...
*Friday, October 31, 2014 at 8:08pm*

**Physics**

I would really appreciate the help for this assignment. A small reasoning for the answer would be very helpful. Thank you. A sphere of mass m and radius r is attached to the rim of a disk (mass M, radius R). The disk is rotating counter-clockwise with a constant period T ...
*Friday, October 31, 2014 at 8:02pm*

**physics**

The drawing shows two transverse waves traveling on two strings. The linear density of each string is 0.0483 kg/m, and the tension is provided by a 15.0-N block that is hanging from the string. Determine the speed of the wave in part (a) and part (b) of the drawing.
*Friday, October 31, 2014 at 8:01pm*

**Physics**

Bats are extremely adept at catching insects in midair. If a 62-g bat flying in one direction at 9 m/s catches a 6-g insect flying in the opposite direction at 4 m/s, what is the speed of the bat immediately after catching the insect?
*Friday, October 31, 2014 at 7:20pm*

**Physics**

A skateboarder of mass 38.0 kg is riding her 3.90-kg skateboard at a speed of 5.40 m/s. She jumps backward off her skateboard, sending the skateboard forward at a speed of 8.5 m/s. At what speed is the skateboarder moving when her feet hit the ground?
*Friday, October 31, 2014 at 6:54pm*

**Physics**

Three children are fighting over a toy. One child pulls on the toy with a force of 100N at an angle of 37° north of east. The second child pulls on the toy with a force of 200N south. The third child pulls with a force of 250N at an angle of 20° south of west. Watching...
*Friday, October 31, 2014 at 5:26pm*

**physics**

A 2.0kg book is lying on a 0.74m high table. You pick it up and place it on a bookshelf 2.0m above the floor
*Friday, October 31, 2014 at 4:47pm*

**Physics**

Jeron has a tendency to drop his bowling ball upon release when bowling. Instead of having the ball on the floor at the completion of his swing, Jeron lets go of the ball 0.35m above the floor. If he throws the ball with a horizontal velocity of 5.3m/s, what distance does it ...
*Friday, October 31, 2014 at 4:35pm*

**Physics**

Alexis Farias realizes her dream to play golf on the moon. She hits a golf ball with an initial velocity of 23.5m/s at an angle of 35.0 degrees above the horizontal. The acceleration due to gravity on the moon is 1.67m/s^2. A). How long is the golf ball in the air? B). How far...
*Friday, October 31, 2014 at 4:32pm*

**Physics**

Alexis Farias realizes her dream to play golf on the moon. She hits a golf ball with an initial velocity of 23.5m/s at an angle of 35.0 degrees above the horizontal. The acceleration due to gravity on the moon is 1.67m/s^2. A). How long is the golf ball in the air? B). How far...
*Friday, October 31, 2014 at 4:29pm*

**Physics**

A billiard ball of mass m = 0.250 kg hits the cushion of a billiard table at an angle of θ1 = 58.8° and a speed of v1 = 28.4 m/s. It bounces off at an angle of θ2 = 71.0° and a speed of v2 = 10.0 m/s. (a) What is the magnitude of the change in momentum of the...
*Friday, October 31, 2014 at 3:48pm*

**Physics**

A 1424-kg railroad car traveling at a speed of 11 m/s strikes an identical car at rest. If the cars lock together as a result of the collision, what is their common speed (in m/s) afterward?
*Friday, October 31, 2014 at 3:47pm*

**Physics **

700 kg plane is traveling at 90 m/s at altitude of 1500 m what is planes total mechanical energy
*Friday, October 31, 2014 at 3:21pm*

**Physics**

A satellite orbits a planet at 4000m/s, and the acceleration of gravity (centripetal acceleration) on the satellite is 0.58m/s2. What is the diameter of the orbit of the satellite? (Enter your answer in scientific notation utilizing "e" format and rounding the ...
*Friday, October 31, 2014 at 3:11pm*

**Physics**

A cord 0.65m long exerts a centripetal force of 23N on a whirling 2kg mass tied to the end of the cord. What is the velocity of the whirling mass? Round to nearest tenth. For this problem, I used to formula V = square root of f/rm. I did the square root of 23/0.65(2) = 8.4m/s^...
*Friday, October 31, 2014 at 3:09pm*

**Physics**

An object of mass 2.5 kg has speed of 15 m/s when height is 5m above ground what is speed when 12 m above ground?
*Friday, October 31, 2014 at 3:06pm*

**physics**

A telescope that has a 100 cm focal length objective and a 3.00 cm focal length eyepiece. Find the distance between the objective and eyepiece lenses in the telescope needed to produce a final image very far from the observer, where vision is most relaxed. Note that a ...
*Friday, October 31, 2014 at 3:05pm*

**Physics**

A 3m long weightless beam is supported at each end by cables (a scaffold). A painter weighing 900N stands 1m from the left cable. Calculate the tension (force) in each cable. I really don't understand this question.
*Friday, October 31, 2014 at 3:01pm*

**Physics**

A 700 kg plane is traveling at 90 m/s at an altitude of 1500 m. What is the total mechanical energy?
*Friday, October 31, 2014 at 2:56pm*

**Science Physics**

A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?
*Friday, October 31, 2014 at 12:28pm*

**Physics**

I was given this problem, and are having problems. I am taking AP Physics and I want to be able to understand the concept. Thank you for your help. A block of mass m = 3.65 kg is attached to a spring (k = 27.5 N/m) by a rope that hangs over a pulley of mass M = 7.30 kg and ...
*Friday, October 31, 2014 at 12:26pm*

**Physics**

This is a very confusing problem, I had never taken physics before and it is going to kill my GPA. can someone please help me solve this problem. I have a quiz coming up. Thanks for the help. The flywheel of an old steam engine is a solid homogeneous metal disk of mass M = 137...
*Friday, October 31, 2014 at 12:12pm*

**Physics**

This is very confusing to me, I tried a couple of the problems and got them wrong. I would really appreciate the help, and an explanation to study for the exam. Thank you in advance. You are the technical consultant for an action-adventure film in which a stunt calls for the ...
*Friday, October 31, 2014 at 12:07pm*

**physics**

A skier leaves the starting gate at the top of a ski ramp with an initial speed of 4.00 m/s (Figure 6-41). The starting position is 120 m higher than the end of the ramp, which is 3.00 m above the snow. Find the final speed of the skier if he lands 145 m down the 20.0° ...
*Friday, October 31, 2014 at 10:06am*

**physics**

Assuming you are on Earth, where acceleration due to gravity is 9.81 meters/second2, and you have a pendulum with a cord that is 0.65 meters long, what is the period?
*Friday, October 31, 2014 at 10:02am*

**physics**

HEy guys just wondering. What would be the basic theory to reverse gravity? Explain needed so basically using gravity to push things up? How would you reverse the energy. Any background knowledge?
*Friday, October 31, 2014 at 8:24am*

**physics**

wheel is spinning with angular speed 8.6 radian/sec.small fractional force on shaft causes a constant angular deacceleration and wheel come to rest in 192 sec.what is angular acceleration and total angle turned during the slow down
*Friday, October 31, 2014 at 6:51am*

**physics**

starting from rest grinding stone has constant angular acceleration 20 rad/sec at time = 0.reference axis is AB.what is angular displacement of line AB.
*Friday, October 31, 2014 at 6:47am*

**venn diagram**

venn diagram solving for 3 students likes geography physics science 75 likes only one subject 65 likes exactly two 15 like all three.1)how many students in a class 2)how many students like atleast one 3)how many students like only physics 4)how many students like only ...
*Friday, October 31, 2014 at 3:21am*

**physics**

If the speed of light through material Z is 2.5 × 108 m/s, what is this material’s index of refraction? The speed of light in a vacuum is 3 × 108 m/s.
*Friday, October 31, 2014 at 1:30am*

**physics**

A skier leaves the starting gate at the top of a ski ramp with an initial speed of 4.00 m/s (Figure 6-41). The starting position is 120 m higher than the end of the ramp, which is 3.00 m above the snow. Find the final speed of the skier if he lands 145 m down the 20.0° ...
*Friday, October 31, 2014 at 12:24am*

**Physics**

At an amusement park, a swimmer uses a water slide to enter the main pool. If the swimmer slides without friction, and descends through a vertical height of 3.01 m, and has a initial speed of 0.970 m/s, what is her speed at the bottom of the slide? ??? m/s
*Thursday, October 30, 2014 at 11:16pm*

**Physics**

I'm supposed to to calculate an experimental value for the acceleration of gravity from the slope of an acceleration vs. delta mass graph... also i'm supposed to find the percent error (to the normal acceleration of gravity of 9.8).. the slope is .442 i'm not sure ...
*Thursday, October 30, 2014 at 10:00pm*

**Physics**

A 2110 kg car traveling at 10.7 m/s collides with a 2780 kg car that is initially at rest at the stoplight. The cars stick together and move 2.00 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that ...
*Thursday, October 30, 2014 at 9:34pm*

**Physics**

A firefighter with a mass of 52 kg slides down a vertical pole with an acceleration of 3 m/s/s . The acceleration of gravity is 10 m/s/s. What is the friction force that is acting on him
*Thursday, October 30, 2014 at 9:09pm*

**Physics**

A crane is lowering two boxes downward at a constant velocity. The cable from the crane is attached directly to the upper box, m1, which has a mass of 95kg and a second cable hanging from the upper box supports the lower box, m2, which has a mass of 140kg. Determine the ...
*Thursday, October 30, 2014 at 8:22pm*

**Physics**

A 120kg box is sliding down a hill at a constant speed. The angle of the incline is 32 degrees. Determine the normal force of the hill on the box. Determine the amount of friction on the box.
*Thursday, October 30, 2014 at 8:20pm*

**physics**

A 71.5 kg ice skater moving to the right with a velocity of 2.92 m/s throws a 0.16 kg snowball to the right with a velocity of 20.1 m/s relative to the ground.
*Thursday, October 30, 2014 at 8:13pm*

**physics**

Displacement vectors A, B, and C add up to a total of zero. Vector A has a magnitude of 1550 m and a direction of 22.9° north of east. Vector B has a direction of 41.0° east of south, and vector C has a direction of 35.2° north of west. Find the magnitudes of ...
*Thursday, October 30, 2014 at 8:01pm*

**physics**

A traffic light weighting 145 newtons hangs from a vertical cable tied to two other cables that are fastened to a support. The upper cables make angles of 31.0 degrees and 57.0 degrees with the horizontal. Find the tension in each of the three cables.
*Thursday, October 30, 2014 at 7:30pm*

**physics**

Displacement vectors A,B,and C add up to a total of zero. Vector A has a magnitude of 1550 m and a direction of 24.1° north of east. Vector B has a direction of 41.0° east of south, and vector C has a direction of 33.4° north of west. Find the magnitudes of vector ...
*Thursday, October 30, 2014 at 6:22pm*

**physics**

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials’ boat pulls up next to the spy’s boat, both boats reach the edge of a 5.0 m waterfall. The spy’s speed is 15 m/s and the officials’ speed is ...
*Thursday, October 30, 2014 at 6:08pm*

**physics**

a chair has a mass of 15kg.If a cat sits on the chair, and the cat has a mass of 5.4kg, what is the normal force on the chair?
*Thursday, October 30, 2014 at 6:03pm*

**physics**

Full explanation of transverse wave with sutable example
*Thursday, October 30, 2014 at 5:50pm*

**Physics Math**

A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?
*Thursday, October 30, 2014 at 5:42pm*

**physics**

Bob, who has a mass of 80kg , can throw a 550g rock with a speed of 27m/s . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. What constant force must Bob exert on the rock to throw it with this speed? If Bob ...
*Thursday, October 30, 2014 at 5:33pm*

**physics**

an object of mass m is suspended by a string of length 2m .the object is rotated in a horizontal circle show the relationship between the tension and mass and linear velocity of the body when the string make an angle to the horizontal
*Thursday, October 30, 2014 at 4:49pm*

**Physics**

The circuit shown below is in a uniform magnetic field that is into the page and is decreasing in magnitude at the rate of 150 tesla/second. What current does the ammeter read?
*Thursday, October 30, 2014 at 3:50pm*

**Physics**

A set of twins work in the Sears Tower, a very tall office building in Chicago. One works on the top floor and other works in the basement. Considering general relativity, which twin will age more slowly?
*Thursday, October 30, 2014 at 3:49pm*

**Physics**

An experiment is designed in which a proton and an antiproton collide, producing a particle with mass 9700 MeV. What must be the incident kinetic energies and velocities of the colliding particles?
*Thursday, October 30, 2014 at 3:48pm*

**Physics**

Creating Z_0 boson via symmetric beams a. Z0 boson has a rest mass energy of 91.187 GeV. It is produced in collisions of positrons and electrons. e^- + e^+ to Z_0 How much kinetic energy must the positrons and electrons in symmetric colliding beams have to produce the Z0 boson...
*Thursday, October 30, 2014 at 3:48pm*

**Physics**

Creating Z_0 boson via symmetric beams a. Z0 boson has a rest mass energy of 91.187 GeV. It is produced in collisions of positrons and electrons. e^- + e^+ to Z_0 How much kinetic energy must the positrons and electrons in symmetric colliding beams have to produce the Z0 boson...
*Thursday, October 30, 2014 at 3:46pm*

**physics**

A pelican flying along a horizontal path drops a fish from a height of 3.1 m. The fish travels 8.4 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s
*Thursday, October 30, 2014 at 3:25pm*

**Math/Physics**

The potential at the surface of a sphere (radius R) is given by V_0 = k cos 3theta where k is constant. Find the potential inside and outside the sphere as well as the surface charge density (lower case sigma(theta)) on the sphere. (assume there is no charge inside or outside ...
*Thursday, October 30, 2014 at 3:14pm*

**Math/Physics**

My question is this: The potential at the surface of a sphere (radius R) is given by V_0 = k cos 3theta where k is constant. Find the potential inside and outside the sphere as well as the surface charge density (lower case sigma(theta)) on the sphere. (assume there is no ...
*Thursday, October 30, 2014 at 2:45pm*

**physics**

How do i find the length of a projection of a vecor A=3x+y+2z on the xy plane? and how do i find the unit vecotr in the xy plane that is perpendiculer to vector A?
*Thursday, October 30, 2014 at 2:36pm*

**physics**

Displacement vectors A, B, and C add up to a total of zero. Vector A has a magnitude of 1550 m and a direction of 22.9° north of east. Vector B has a direction of 41.0° east of south, and vector C has a direction of 35.2° north of west. Find the magnitudes of ...
*Thursday, October 30, 2014 at 2:20pm*

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