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September 17, 2014

September 17, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics Help**

Freshly picked cucumbers are dropped into a bin from a height of 1.25 m above the bottom of the bin. Assuming that the bin is empty, how fast is a cucumber going when it hits the bottom of the bin? How much time does it take the cucumber to fall to the bottom of the bin? Thanks!
*Thursday, September 11, 2014 at 8:15pm*

**physics**

How far is the rocket from the launch pad 8.50s later when the rocket engine runs out of fuel?
*Thursday, September 11, 2014 at 7:49pm*

**Physics Help Please**

a) On the Acme W&W company production line, parts have to be transported 100 m by conveyor belt to a machine area. The parts move at a constant speed of 2.5 m/s. How much time does it take to move a part 100 m? b) On the same conveyor belt as described in problem a), the part ...
*Thursday, September 11, 2014 at 7:23pm*

**Physics Help**

1) two cars start at the same location and accelerate for the same amount of time. if one car has twice the acceleration of the other, how will the final speeds of the cars compare? by how much farther will the faster car outdistance the slower car?
*Thursday, September 11, 2014 at 7:20pm*

**Physics**

A kayaker needs to paddle north across a 85 m wide harbor. The tide is going out, creating a tidal current that flows to the east at 1.6 m/s. The kayaker can paddle with a speed of 2.8 m/s. (a) In which direction should he paddle in order to travel straight across the harbor?
*Thursday, September 11, 2014 at 6:59pm*

**physics**

When the Sun is directly overhead, a hawk dives toward the ground with a constant velocity of 4.80 m/s at 50.5° below the horizontal. Calculate the speed of her shadow on the level ground. What i have done: x= rcos(theta) x=4.80m/s*cos(309.5) x=3.05m y=rsin(theta) y=4.80m/...
*Thursday, September 11, 2014 at 5:35pm*

**Physics**

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.880 m/s at an angle of 34.1° above the table, and it lands on the magazine 0.0790 s after leaving the table. Ignore air resistance. How thick is the magazine? ...
*Thursday, September 11, 2014 at 4:23pm*

**Physics**

At bat a baseball player hits a ball at a height of .889 m. The ball leaves the bat at 51 m/s at an angle of 81 degrees from the vertical. The ball skims the top of a 2.74 m wall as it leaves the field. a.) Draw position, velocity and acceleration graphs describing the ball ...
*Thursday, September 11, 2014 at 3:01pm*

**physics**

A skydiver falls d1 = 495 meters in t1 = 22 s before opening his parachute. After the chute opens, he falls an additional d2 = 470 meters in t2 = 56.5 s. Write an expression that describes the skydiver's average speed, v1 during the period before opening the chute in terms...
*Thursday, September 11, 2014 at 3:00pm*

**physics**

Sound travels at 343 m/s in the air. What distance from the student is the lightning strike, in meters? Write an expression that describes the skydiver's average speed, v1 during the period before opening the chute in terms of the given quantities. Expression. v1 = ...
*Thursday, September 11, 2014 at 2:58pm*

**Intro-Physics **

Using a Doppler ultrasound, the velocity of blood flow in a vein or an artery can be measured. In a particular patient, the flow in a particular artery is found to be 30 cm/s at one point, and 20 cm/s at a point farther from the heart. If the two points in the artery are 50 cm...
*Thursday, September 11, 2014 at 2:50pm*

**Physics Help**

a) On the Acme W&W company production line, parts have to be transported 100 m by conveyor belt to a machine area. The parts move at a constant speed of 2.5 m/s. How much time does it take to move a part 100 m? On the same conveyor belt as described in problem a), the part ...
*Thursday, September 11, 2014 at 2:46pm*

**Physics Help**

On the Acme W&W company production line, parts have to be transported 100 m by conveyor belt to a machine area. The parts move at a constant speed of 2.5 m/s. How much time does it take to move a part 100 m? Show steps please! Thank you!
*Thursday, September 11, 2014 at 2:44pm*

**Physics Help Please**

1) two cars start at the same location and accelerate for the same amount of time. if one car has twice the acceleration of the other, how will the final speeds of the cars compare? by how much farther will the faster car outdistance the slower car?
*Thursday, September 11, 2014 at 2:40pm*

**physics**

A student witnesses a flash of lightning and then t = 6.5 s later the student hears the associated clap of thunder. Sound travels at 343 m/s in the air. What distance from the student is the lightning strike, in meters?
*Thursday, September 11, 2014 at 2:40pm*

**physics**

The vertical acceleration of a projectile A)equals g pointing sometimes upwards and other times downwards. B)equals g pointing upwards C)is zero. D)equals g pointing downwards E)continuously increases. Thanks!
*Thursday, September 11, 2014 at 1:31pm*

**Physics - please check my answer**

A man tosses a ball upward. It reaches its highest point after 25 seconds. Find its initial velocity. Alright, so I tried solving this. I used the equations (let v = initial velocity): h = v^2 / 2g , and h = (v*t) - (1/2)(g)(t^2) and I got 101.48 m/s. Is this correct?
*Thursday, September 11, 2014 at 1:22pm*

**Math, Physics**

A soccer ball is kicked from the ground at an angle of è = 46 degrees with respect to the horizontal. The hang time of the ball is tm = 1.9 s. What is the total horizontal distance traveled by the ball in meters?
*Thursday, September 11, 2014 at 12:49pm*

**Physics**

How long is Mayra, a ballerina, in the air when she leaps striaght up with a speed of 1.23 m/s?
*Thursday, September 11, 2014 at 12:33pm*

**Physics**

How long is Mayra, a ballerina, in the air when she leaps straight up with a speed of 1.23 m/s?
*Thursday, September 11, 2014 at 12:29pm*

**physics **

the peregrine falcon is the world's fastest known bird and has been clocked driving downward toward its pray at a constant vertical velocity of 97.2 meters per second. If the falcon drives straight down from a height of 100 meters, how much time does this give a rabbit ...
*Thursday, September 11, 2014 at 11:13am*

**Physics Help!**

The Fly wheel has a small magnet of mass M mounted on it. Each time the magnet passes the coil, a voltage pulse is generated , which is passes to the c.r.o the display of the c.r.o is 10 cm wide . The flywheel is rotating at a rate of about 3000 revolutions per minute . Which ...
*Thursday, September 11, 2014 at 10:28am*

**physics**

A runner is at the starting gate and hears the starting gun. He begins running with a constant acceleration ai = 0.55 m/s2. He crosses the finish line at d = 100 m and then begins slowing down. It takes him tr to cross the finish line. It takes him ts = 6.5 s to return to rest...
*Thursday, September 11, 2014 at 8:21am*

**physics**

A runner is at the starting gate and hears the starting gun. He begins running with a constant acceleration ai = 0.55 m/s2. He crosses the finish line at d = 100 m and then begins slowing down. It takes him tr to cross the finish line. It takes him ts = 6.5 s to return to rest...
*Thursday, September 11, 2014 at 8:16am*

**physics**

A hockey puck truck at ice level just clears the top of a glass wall that is 2.80 m high. The flight time to this point is 0.650 s, and the horizontal distance is 12.0 m. Find a.) the initial speed of the puck and b.) the maximum height it will reach.
*Thursday, September 11, 2014 at 6:53am*

**physics**

In a certain particle, a current of 0.50 mA is carried by a 5.0MeV proton beam that has a radius of 1.5 mm. Find the density of protons in the beam.if the beam hits a target, how many protons hit the target in 1.0s.
*Thursday, September 11, 2014 at 6:52am*

**Physics 1 **

You are to drive to an interview. The interview is at 11:15 a.m. You plan to drive at , so you leave at 8:00 a.m. to allow some extra time. You drive at that speed for the first , but then construction work forces you to slow to for . What would be the least speed needed for ...
*Thursday, September 11, 2014 at 6:51am*

**physics**

A hockey puck truck at ice level just clears the top of a glass wall that is 2.80 m high. The flight time to this point is 0.650 s, and the horizontal distance is 12.0 m. Find a.) the initial speed of the puck and b.) the maximum height it will reach.
*Thursday, September 11, 2014 at 6:33am*

**physics**

Assume that an intercontinental ballistic missile goes from rest to a suborbital speed of 6.50 km/s in 60.0 s (the actual speed and time are classified). What is its average acceleration in m/s2 and in multiples of g (9.80 m/s2 )?
*Thursday, September 11, 2014 at 4:43am*

**physics**

A commuter backs her car out of her garage with an acceleration of 1.40 m/s2. (a) How long does it take her to reach a speed of 2.00 m/s? (b) If she then brakes to a stop in 0.800 s, what is her deceleration?
*Thursday, September 11, 2014 at 4:20am*

**Physics**

1. An 80.0-kg astronaut is floating at rest a distance of 10.0 m from a spaceship when she runs out of oxygen and fuel to power her back to the spaceship. She removes her oxygen tank (3.0 kg) and flings it into space away from the ship with a speed of 15 m/s. At what speed ...
*Thursday, September 11, 2014 at 4:09am*

**Physics**

A ball is dropped from a roof of a building and strikes the ground in 3 seconds. If a second ball is thrown horizontally from the roof, it will hit the ground in:
*Thursday, September 11, 2014 at 12:24am*

**Physics**

A pebble is thrown horizontally from the top of a 25.0 m cliff and hits the ground 11.0 m from the edge of the cliff. a. How long will it take for the pebble to hit the ground? b. At what speed the pebble was thrown initially? c. How much is the horizontal component of the ...
*Wednesday, September 10, 2014 at 11:37pm*

**physics**

A car makes a 257 km trip at an average speed of 40 km/h. A second car starting 1 h later arrives at their mutual destination at the same time. What was the average speed of the second car for the period that it was in motion? a=40 d=257 km I don't know where to start or ...
*Wednesday, September 10, 2014 at 10:28pm*

**Physics**

Automotive engineers refer to the time rate of change of acceleration as the "jerk." Assume an object moves in one dimension such that its jerk J is constant. (a) Determine expressions for its acceleration ax(t), velocity vx(t), and position x(t), given that its ...
*Wednesday, September 10, 2014 at 10:10pm*

**Physics **

An 18-year-old runner can complete a 10.0-km course with an average speed of 4.39 m/s. A 50-year-old runner can cover the same distance with an average speed of 4.27 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time...
*Wednesday, September 10, 2014 at 9:22pm*

**physics**

A swimmer heads directly across a river, swimming at 1.2 m/s relative to the water. She arrives at a point 48 m downstream from the point directly across the river, which is 77 m wide. (a) What is the speed of the river current? (b) What is the swimmer's speed relative to ...
*Wednesday, September 10, 2014 at 9:21pm*

**physics**

Two people take identical jet skis across a river, traveling at the same speed relative to the water. Jet ski A heads directly across the river and is carried downstream by the current before reaching the opposite shore. Jet ski B travels in a direction that is 35° ...
*Wednesday, September 10, 2014 at 9:19pm*

**physics**

You are riding on a jet ski directed at an angle upstream on a river flowing with a speed of 2.8 m/s. If your velocity relative to the ground is 8.0 m/s at an angle of 30.5° upstream, what is the speed of the jet ski relative to the water? I thought I should just use ...
*Wednesday, September 10, 2014 at 9:14pm*

**physics**

The pilot of an airplane wishes to fly due north, but there is a 71 km/h wind blowing toward the east. (a) In what direction should the pilot head her plane if its speed relative to the air is 314 km/h? ° west of north Should the angle just be the opposite of the one ...
*Wednesday, September 10, 2014 at 9:12pm*

**Physics**

A Nile cruise ship takes 21.7 h to go upstream from Luxor to Aswan, a distance of 208 km, and 20.3 h to make the return trip downstream. Assuming the ship's speed relative to the water is the same in both cases, calculate the speed of the current in the Nile.
*Wednesday, September 10, 2014 at 9:12pm*

**physics**

The captain of a plane wishes to proceed due west. The cruising speed of the plane is 226 m/s relative to the air. A weather report indicates that a 32.0-m/s wind is blowing from the south to the north. In what direction, measured with respect to due west, should the pilot ...
*Wednesday, September 10, 2014 at 8:57pm*

**Physics-bobpursley Follow Up**

Initial Question: A rubber ball is dropped onto a ramp that is tilted at 20 degrees. A bounding ball obeys the "law of reflection," which says that the ball leaves the surface at the same angle it approached the surface. The ball's next bounce is 3.0 m to the ...
*Wednesday, September 10, 2014 at 8:56pm*

**Physics**

An arrow is shot into the air at an angle of 59.4° above the horizontal with a speed of 20.0 m/s. What is the x-component of the velocity of the arrow 3.30 s after it leaves the bowstring? What is the y-component of the velocity of the arrow 3.30 s after it leaves the ...
*Wednesday, September 10, 2014 at 8:51pm*

**Physics**

A particle's constant acceleration is north at 108 m/s2. At t = 0, its velocity vector is 62.8 m/s east. At what time will the magnitude of the velocity be 118 m/s
*Wednesday, September 10, 2014 at 8:50pm*

**physics**

A 1.8-kg object moves in the x direction according to the following function: x(t) = 2t2 + 3t − 5 (SI units). What is the force on the object after 2.7 s?
*Wednesday, September 10, 2014 at 7:55pm*

**physics**

A kangaroo jumps straight up to a vertical height of 1.19m, how long was it in the air before returning on earth
*Wednesday, September 10, 2014 at 7:18pm*

**Physics**

A commuter backs her car out of her garage with a constant acceleration of 1.40 m/s2. (a) How long does it take her to reach a speed of 1.60 m/s? s (b) If she then brakes to a stop in 0.8 s, what is her (constant) deceleration? m/s2
*Wednesday, September 10, 2014 at 7:11pm*

**physics**

A rocket rises vertically, from rest, with an acceleration of 3.2 m/s2 until it runs out of fuel at an altitude of 730m . After this point, its acceleration is that of gravity, downward.whats the maximum altitude does the rocket reach?
*Wednesday, September 10, 2014 at 6:37pm*

**Chemistry**

1. Imagine that you work at a company that prepares chemical solutions. You are asked to label a solution to sell to different customers. One customer is a hospital, another is a chemistry lab at a university, and a third is a physics lab at a university. You added 900 kg of ...
*Wednesday, September 10, 2014 at 4:13pm*

**physics**

a piolet wishes to fly to a city 1.20*10^3 km/h(N30E) of her present position .There is a wind of 72km/h(E),what direction (heading) should she fly and how long the trip takes?
*Wednesday, September 10, 2014 at 4:12pm*

**physics**

A record of travel along a straight path is as follows: 1. Start from rest with constant acceleration of 2.59 m/s2 for 19.0 s. 2. Maintain a constant velocity for the next 2.15 min. 3. Apply a constant negative acceleration of −9.08 m/s2 for 5.42 s. (a) What was the ...
*Wednesday, September 10, 2014 at 3:47pm*

**physics**

A toy rocket, launched from the ground, rises vertically with an acceleration of 28 m/s2 for 9.5 s until its motor stops. Disregarding any air resistance, what max- imum height above the ground will the rocket achieve? The acceleration of gravity is 9.8 m/s2 . Answer in units ...
*Wednesday, September 10, 2014 at 2:07pm*

**physics**

A ball player catches a ball 3.70s after throwing it vertically upward, what speed did he threw it
*Wednesday, September 10, 2014 at 1:20pm*

**physics**

from a cliff of 49m high ,a man drops a stone 1s later he throes second stone . they both hit the ground at the same time . find out the speed with which he throws the second stone.
*Wednesday, September 10, 2014 at 1:20pm*

**physics**

A block of mass M1 = 0.320 kg is initially at rest on a cart of mass M2 = 0.680 kg with the cart initially at rest on a level air track. The coefficient of static friction between the block and the cart is ?s = 0.610, but there is essentially no friction between the air track...
*Wednesday, September 10, 2014 at 1:08pm*

**Physics**

A box is sliding down a frictionless plane inclined at an angle of 30° width the horizontal. What is the acceleration of the box?
*Wednesday, September 10, 2014 at 12:58pm*

**Physics**

A tennis player hits a ball 1.6 m above the ground. The ball leaves the racket with a speed of 12 m/s at an angle 8.0 degrees above the horizontal. The net is a horizontal distance of 7.0 m away from the player and is 1.0 m high. (a.) Does the ball clear the net? Explain how ...
*Wednesday, September 10, 2014 at 12:09pm*

**Physics**

Henry Heavyweight weighs 1400N and stands on a pair of bathroom scales so that one scale reads twice as much as the other. What are the scale readings?
*Wednesday, September 10, 2014 at 11:43am*

**Physics**

The coefficient of rolling friction between the floor and the hardened steel balls of an anesthesia trolley (anesthesia machine with ventilator and monitor) is 0.0015. If a hospital crew needs 77 N to push the trolley at an angle of 30 degrees below the horizontal with ...
*Wednesday, September 10, 2014 at 9:51am*

**Physics**

A body weighing 980N is moving with constant speed of 5 m/s on a horizontal surface. The coefficient of sliding friction between the body and the surface is 0.25. What horizontal pull is necessary to maintain the motion?
*Wednesday, September 10, 2014 at 9:45am*

**physics**

What horizontal force is needed to push a hospital bed of mass 120 kg at a constant speed up a smooth sloping plane inclined at an angle of 37 degrees above the ground?
*Wednesday, September 10, 2014 at 9:41am*

**Physics**

A car accelerates uniformly from rest at 3m/s(square).What is its velocity after travelling a distance of 24m?
*Wednesday, September 10, 2014 at 9:21am*

**College Physics**

How many gallons of Oil would be in a cylindrical tank that was 24 feet long and had a diameter of 6 feet if the oil was 6 inches deep at the bottom of the tank?
*Wednesday, September 10, 2014 at 8:05am*

**physics**

a pump fills a tank of capacity 300 m^3 in 5 hours.the tank is situated at a height of 20 m.if the efficiency of the tank is 65%. then calculate the power of the engine which has driven the pump.
*Wednesday, September 10, 2014 at 4:48am*

**physics **

A carton of juice remains intact even after you have sucked out all the drink from it. please explain
*Wednesday, September 10, 2014 at 4:22am*

**physics**

A man stands at the top of a 27-m high building and throws a penny straight downward. If the penny has an initial velocity of -3.9 m/s, what is the velocity of the penny in m/s when it hits the ground?
*Tuesday, September 9, 2014 at 11:17pm*

**physics**

Tammy drives 34 km due north, then continues in a direction of 32◦ north of east for 99 km.What is her total displacement from the office?
*Tuesday, September 9, 2014 at 10:51pm*

**physics**

a large aircraft accelerates sown the runway for a distance of 3000m before leaving the ground. It then climbs at a steady 3 degree angle. After the plan has travelled 4000m along this new trajectory, how high is it and how far horizontally is it from its initial position?
*Tuesday, September 9, 2014 at 10:22pm*

**physics**

Runner A is initially 5.3 km west of a flagpole and is running with a constant velocity of 8.4 km/h due east. Runner B is initially 4.5 km east of the flagpole and is running with a constant velocity of 7.1 km/h due west. How far are the runners from the flagpole when their ...
*Tuesday, September 9, 2014 at 9:55pm*

**Physics**

A truck on a straight road starts from rest and accelerates at 2.8 m/s^2 until it reaches a speed of 16 m/s. Then the truck travels for 16s at constant speed until the brakes are applied,stopping the truck in a uniform manner in an additional 3.6 s. How long is the truck in ...
*Tuesday, September 9, 2014 at 9:25pm*

**Physics 2**

A proton is accelerated from rest through a potential difference of 129 V. Calculate the final speed of this proton. The mass of a proton is 1.673 × 10−27 kg and the elemental charge is 1.602 × 10−19 C . Answer in units of m/s
*Tuesday, September 9, 2014 at 9:08pm*

**physics**

A bush baby, an African primate, is capable of leaping vertically to the remarkable height of 2.3 m. To jump this high, the bush baby accelerates over a distance of 0.18m while extending the legs. The acceleration during the jump is approximately constant. What is the ...
*Tuesday, September 9, 2014 at 7:23pm*

**physics**

1.A motorist drive along a straight road at a constant speed of 15.0 m/s.Just as she passes a parked motorcycle police officer,the officer starts to accelerate at 2.0 m/s^2 to overtake her. Assuming the officer maintains this acceleration, a) determine the time it takes the ...
*Tuesday, September 9, 2014 at 6:45pm*

**physics **

A skydiver weighs 158 lb. When the skydiver reaches terminal speed, how much air drag does the skydiver experience?
*Tuesday, September 9, 2014 at 6:05pm*

**Physics**

A rubber ball is dropped onto a ramp that is tilted at 20 degrees. A bounding ball obeys the "law of reflection," which says that the ball leaves the surface at the same angle it approached the surface. The ball's next bounce is 3.0 m to the right of its first ...
*Tuesday, September 9, 2014 at 5:09pm*

**physics**

A sports car moving at constant velocity travels 110m in 5.1s .If it then brakes and comes to a stop in 4.3s , what is the magnitude of its acceleration (assumed constant) in m/s2?
*Tuesday, September 9, 2014 at 5:09pm*

**Physics**

Find the attractive force bet a 50 kg girl and a 60 kg boy, if they stand 2.00 m apart.
*Tuesday, September 9, 2014 at 4:56pm*

**physics**

Cars A and B are racing each other along the same straight road in the following manner: Car A has a head start and is a distance DA beyond the starting line at t=0. The starting line is at x=0. Car A travels at a constant speed vA. Car B starts at the starting line but has a ...
*Tuesday, September 9, 2014 at 4:50pm*

**physics**

A sports car accelerates from rest to 86km/h\, km/h in 5.2s\, s . What is its average acceleration in m/s2{\rm{m/s}}^2.
*Tuesday, September 9, 2014 at 3:28pm*

**physics**

a rolling ball moves x1 = 8.0 cm to x2 = -4.3 cm during a time interval t1= 3.5 to t2- 6.9, what is the average velocity over this time interval
*Tuesday, September 9, 2014 at 1:23pm*

**physics**

A 1600n is supported by two cables of equal length two ends are fasted by two nail by place horizontal level at 8m part .find the tension each cables when the block6m below the horizontal level.
*Tuesday, September 9, 2014 at 12:44pm*

**Physics**

A 1kg pigeon sits on the middle of a clothesline whose supports are 10m apart. The clothesline sags by 1 meter. If the weight of the clothesline is negligible, find the tension in it.
*Tuesday, September 9, 2014 at 12:02pm*

**Physics**

A stretched wire 75cm long emits a fundamental frequency of 300Hz.By how much the length be changed so that it emits a fundamental note of 450Hz?
*Tuesday, September 9, 2014 at 10:16am*

**Physics**

a racing car reaches a speed of 44m/s. at this instandt, it behins a uniform deceleration using a parachute and a braking system, and comes to a rest 4.8s later. Find the acceleration of the car
*Tuesday, September 9, 2014 at 10:03am*

**physics**

1.A motorist drive along a straight road at a constant speed of 15.0 m/s.Just as she passes a parked motorcycle police officer,the officer starts to accelerate at 2.0 m/s^2 to overtake her. Assuming the officer maintains this acceleration, a) determine the time it takes the ...
*Tuesday, September 9, 2014 at 9:45am*

**physics**

A block of mass M slides along the smooth wedge mass M.what will be the acceleration of centre of mass of block and wedge system?
*Tuesday, September 9, 2014 at 8:28am*

**Physics**

A 1kg pigeon sits on the middle of a clothesline whose supports are 10m apart. The clothesline sags by 1 meter. If the weight of the clothesline is negligible, find the tension in it.
*Tuesday, September 9, 2014 at 7:52am*

**Physics**

This is based off of the paper "Scaling -- The Physics of Lilliput", but I think the following questions can be answered out of context: 1. Based on the Lilliputian reading: A) A rectangular water tank is supported above the ground by 4 pillars 5.0 cm long whose ...
*Tuesday, September 9, 2014 at 6:22am*

**physics**

what is the perpendicular distance between two parellel rays emerging from a glass block called please give reply as tomorrow i have physics paper
*Tuesday, September 9, 2014 at 3:49am*

**physics**

A car is traveling along a straight road at a velocity of +27.7 m/s when its engine cuts out. For the next 1.94 seconds, the car slows down, and its average acceleration is . For the next 4.92 seconds, the car slows down further, and its average acceleration is . The velocity ...
*Tuesday, September 9, 2014 at 2:23am*

**physics**

Assume a projectile is launched from ground height over a flat plane, at an angle of 50 degrees above the horizontal with an initial speed of 100 m/s. What is the initial velocity of the projectile parallel to the ground (in the x direction) and perpendicular to the ground (in...
*Monday, September 8, 2014 at 9:46pm*

**physics**

A ball is tossed with enough speed straight up so that it is in the air several seconds. Assume upward direction is positive and downward is negative.What is the acceleration of the ball during any of these time intervals? What is the acceleration of the ball at the moment the...
*Monday, September 8, 2014 at 8:33pm*

**Physics**

A helicopter is ascending vertically with a speed of 5.66m/s. At a height of 106m above the Earth, a package is dropped from the helicopter. How much time does it take the package the package to reach the ground? (Ignore air resistance) I would like to know what my givens are ...
*Monday, September 8, 2014 at 7:25pm*

**physics**

A blue ball is thrown upward with an initial speed of 22.8 m/s, from a height of 0.8 meters above the ground. 2.8 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 10.9 m/s from a height of 29.3 meters above the ground. The force of ...
*Monday, September 8, 2014 at 7:00pm*

**Physics**

Vector A has a magnitude of 13.0 units and points due west. Vector B points due north. (a) what is the magnitude of B if A+B has a magnitude of 16.8 units? (b) What is the direction of A+B relative to due west? (c) What is the magnitude of B if A-B has a magnitude of 16.8 ...
*Monday, September 8, 2014 at 6:55pm*

**Physics**

You have three balls, one is thrown upward at 30m/s, on is dropped, and one is thrown toward the ground at 20m/s. what is the acceleration of the dropped ball? Vf=0m/s + (-10m/s^2)(1) =0m/s -10m?s^2 = -10m/s a= -10m/s * 0 /1 = 0 am i on the right track.....? please help
*Monday, September 8, 2014 at 6:41pm*

**physics**

Calculate the acceleration of a ball that starts from rest, rolls down a ramp, and gains a speed of 24m/sm/s in 5.8 seconds.
*Monday, September 8, 2014 at 5:37pm*

**physics**

Calculate the distance you will travel if you maintain an average speed of 12km/h for one-half hour.
*Monday, September 8, 2014 at 5:32pm*

**Physics**

Calculate the average speed (in km/h)of Larry, who runs to the store 3.6 kilometers away in 40 minutes.
*Monday, September 8, 2014 at 5:31pm*

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