Thursday

May 26, 2016
**physics **

A boat is inclined upwards at 30 to the horizontal. the tension of the string is 200N. what is the force tending to raise the boat out of water.
*Sunday, February 21, 2016 by anointed *

**physics**

Three point charges, +6.5 μC, +1.8 μC, and −3.4 μC, lie along the x-axis at 0 cm, 1.7 cm, and 5.4 cm, respectively. What is the force exerted on q1 by the other two charges? (To the right is positive.) The Coulomb constant is 8.99 × 109 N · m2...
*Sunday, February 21, 2016 by anonymous*

**Physics**

You often see birds resting on power lines that carry currents of 48 A. The copper wire on which the bird stands has a radius of 1.5 cm. Assuming that the bird's feet are 3.3 cm apart, calculate the potential difference across its body.
*Sunday, February 21, 2016 by Physics lover *

**Physics**

1. An arrow is shot from the top of a 50 m castle wall at 18 m/s horizontal to the ground. How far from the base of the castle wall will it land? 2. A cannon with a muzzle velocity of 45m/s is shot a various angles to get maximum distance. The general knows that if it is shot ...
*Sunday, February 21, 2016 by Bryan*

**Physics**

what maximizes our ability to recover elastic potential energy?
*Sunday, February 21, 2016 by Mel*

**physics**

A 3.00-kg block starts from rest at the top of a 31.0° incline and slides 2.00 m down the incline in 1.40 s. (a) Find the acceleration of the block. m/s2 (b) Find the coefficient of kinetic friction between the block and the incline. (c) Find the frictional force acting on...
*Sunday, February 21, 2016 by john*

**physics**

A block of mass m = 5.4 kg is pulled up a θ = 24° incline as in the figure with a force of magnitude F = 35 N. (a) Find the acceleration of the block if the incline is frictionless. m/s2 (b) Find the acceleration of the block if the coefficient of kinetic friction ...
*Sunday, February 21, 2016 by john*

**physics**

A 4.00 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal, as in the figure below. The block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinetic friction between block and ...
*Sunday, February 21, 2016 by mark*

**physics**

7.–/3 points SerCP9 4.P.063.My Notes Question Part Points Submissions Used A box rests on the back of a truck. The coefficient of static friction between box and bed of the truck is 0.355. (a) When the truck accelerates forward, what force accelerates the box? the ...
*Sunday, February 21, 2016 by mark*

**physics**

A hockey puck is hit on a frozen lake and starts moving with a speed of 14.0 m/s. Five seconds later, its speed is 5.50 m/s. (a) What is its average acceleration? m/s2 (b) What is the average value of the coefficient of kinetic friction between puck and ice? (c) How far does ...
*Sunday, February 21, 2016 by mark*

**physics**

A 5.4-kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 3.7 m/s2, find the force exerted by the rope on the bucket. N
*Sunday, February 21, 2016 by lisa*

**physics**

A 61-kg man standing on a scale in an elevator notes that as the elevator rises, the scale reads 815 N. What is the acceleration of the elevator? m/s2 upward
*Sunday, February 21, 2016 by lisa*

**physics**

A bag of sugar weighs 3.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? N Repeat for Jupiter, where g is 2.64 times that on Earth. N Find the mass of the bag of sugar in kilograms at each of the three ...
*Sunday, February 21, 2016 by lisa*

**physics**

weights of man 10kg and 8kg are placed near p and q respectively one each end of the beam calculate the Reactions at p and q. [1kg is 10N]
*Sunday, February 21, 2016 by joseph*

**physics**

a uniform beam 6.0m long and weighing 4kg on support of p and q placed let and right 1.0m from each end of the beam
*Sunday, February 21, 2016 by joseph*

**Physics**

A particle moves in three dimensional space as an equation r= (t^2+1.34t)i^+(3.34t-2)j^+(2t^3-4t^2)k^ where is in unit of meter and in second. a.Sketch the path of this particle b.Calculate velocity at t=2 s c.Calculate acceleration at t=2 s
*Sunday, February 21, 2016 by Supansa*

**Physics**

(a) Two go-karts, A and B, travel around two circular tracks of radius 5 m and 10 m, respectively, each in 10.34 s. Does A or B have the greater acceleration? Which has the greater speed? (b)If instead the two go-karts travel around the two tracks at the same speed, which has ...
*Sunday, February 21, 2016 by Supansa*

**Physics**

A stone is whirled at the end of a rope 30cm long,makes 10 complete revolution in 2 seconds.find (1)the angular velocity in radians per seconds.(2)the linear speed (3)the distance
*Sunday, February 21, 2016 by Abba*

**Physics**

A 10.0-g marble slides to the left with a velocity of magnitude 0.400 m/s on the frictionless, horizontal surface of an icy New York sidewalk and has a head-on, elastic collision with a larger 30.0-g marble sliding to the right with a velocity of magnitude 0.200 m/s. Let +x be...
*Sunday, February 21, 2016 by Anonymous*

**physics **

1kg of ice at 0C is placed in a container with 2kg of water at 65C. The container is in an atmospheric pressure that remains at 15C. There is a free exchange of energy between all items so that a final temperature of 15C is reached. Calculate the amount of heat transferred to...
*Saturday, February 20, 2016 by Ezekiel *

**physics**

A courier is delivering a 5kg package to an office high in a tall building. (a) What upwards force does the courier apply to the package when carrying it horizontally at a constant velocity of 2m/s into the building? (b) The courier uses the elevator to reach the office. While...
*Saturday, February 20, 2016 by tamara*

**Physics**

A 25 kg box is dragged across a floor by a rope that makes an angle of 60 degrees with the horizontal. The tension in the rope is 100 N while the box is dragged 15 m. A) how much work is done by tension? B) how much work is done by gravity?
*Saturday, February 20, 2016 by Jo*

**physics**

At what height above the ground must a body of mass 10kg besituated in order to have potentral energy possed by another body of mass 10kg maining with velocity of 10ms
*Saturday, February 20, 2016 by lipsy*

**Physics**

(a) Two go-karts, A and B, travel around two circular tracks of radius 5 m and 10 m, respectively, each in 10.34 s. Does A or B have the greater acceleration? Which has the greater speed? (b)If instead the two go-karts travel around the two tracks at the same speed, which has ...
*Saturday, February 20, 2016 by Supansa*

**Physics**

A particle moves in three dimensional space as an equation r= (t^2+1.34t)i^+(3.34t-2)j^+(2t^3-4t^2)k^ where is in unit of meter and in second. a.Sketch the path of this particle b.Calculate velocity at c.Calculate acceleration at
*Saturday, February 20, 2016 by Supansa*

**Physics**

Two students each hit a golf ball at the same speed, but the first student hits his ball at an angle of 60.34o with the horizontal, and the second student hits his at (30-0.34)o with the horizontal. Which ball goes further? Which one hits the ground first? (Neglect air ...
*Saturday, February 20, 2016 by Supansa*

**Physics**

Two heavy balls are released from different heights, one 2.34 s after the other. If the two balls hit the ground at the same time, 4.0 s after the first is released, from what heights were they dropped?
*Saturday, February 20, 2016 by Supansa*

**physics**

A 3250kg truck traveling 44m/s north collides with a 1500kg car traveling 17m/s south. If the two vehicles stick together after the collision, what is the speed and direction of the two vehicles?
*Saturday, February 20, 2016 by Anonymous*

**general physics**

A string going over a massless frictionless pulley connects two blocks of masses 5.9 kg and 9.5 kg. the 5.9 kg block lies on a 31 ◦ incline; the coefficient of kinetic friction between the block and the incline is µ = 0.22. The 9.5 kg block is hanging in the air. ...
*Saturday, February 20, 2016 by David*

**physics**

a baseball is released at rest from the top of a building.it hits the ground after falling for 6seconds . what was the height from which the ball was dropped
*Saturday, February 20, 2016 by winnex*

**Physics**

A point charge is placed at the center of a net uncharged spherical conducting shell of inner radius 2.5 cm and outer radius 4.0 cm. As a result, the outer surface of the shell acquires a surface charge density σ = 71nC/cm2. Find (a) the value of the point charge, and (b...
*Saturday, February 20, 2016 by Kaleem*

**Physics**

How much heat is absorved when a temparature of a piece of iron of mass 0.1kg and specific heat capacity 2*10 rest to power of 2 J/kg/k is rise from 25degree celcius to 75degree celcius
*Saturday, February 20, 2016 by Samuel*

**physics**

what is the work done a bringing a charge from infinity to a point P, if the point P is 5m to the positive y-axis from a charge A(5uC) which is 3m to the left of another charge B(-2uC)?
*Saturday, February 20, 2016 by jay*

**Physics**

A spherical satellite has 12 identical monopropellant thrust chambers for attitude control with the following performance characteristics: thrust (each unit): 5 lbf; Is (steady state or more than 2 sec): 240 sec; Is (pulsing duration 20 msec): 150 sec; Is (pulsing duration 100...
*Friday, February 19, 2016 by Matthew*

**Physics**

some quantity of charge is distributed uniformly over the surface of a thin walled hollow sphere of radius 0.5m. The magnitude of the field is 4.0×10^2N/C at a distance of 6.0m from the center of the sphere. Calculate the quantity of charge on the sphere .
*Friday, February 19, 2016 by Love*

**physics**

A machine with a velocity ratio requires 1000J of work to raise a load of 500N through a vertical distance of 1.7m . find the efficiency and mechanical advantage of the machine.
*Friday, February 19, 2016 by Azeez*

**physics**

A machine with v.r requires 1000J of work to raise a load of 500N through a vertical distance of 1.7m . find the efficiency and m.a of the machine.
*Friday, February 19, 2016 by Azeez*

**physics**

A machine with v.r requires 1000J of work to raise a load of 500N through a vertical distance of 1.7m . find the efficiency and m.a of the machine.
*Friday, February 19, 2016 by Azeez*

**physics 12th**

two halves of a round homogenous cyl inder are held together by a thread wrapped round the cylinder with two weights m are same.the complet cylinder has mass m1=31.4kg find minimum value of m for equlibrium of a cylinder
*Friday, February 19, 2016 by abhijit*

**Physics**

How long it takes a car at 20m/s to come to a stop without friction, obstacles, or breaks ?
*Friday, February 19, 2016 by Nour*

**physics**

why physics is not understandable?
*Friday, February 19, 2016 by namera*

**Physics **

Calculate the thermal energy required to convert 5kg of ice at 0 Celsius to steam at 100 Celsius
*Friday, February 19, 2016 by Lina*

**physics**

A cat dozes on a stationary merry-go-round, at a radius of 4.5 m from the center of the ride. The operator turns on the ride and brings it up to its proper turning rate of one complete rotation every 7.2 s. What is the least coefficient of static friction between the cat and ...
*Thursday, February 18, 2016 by Anonymous*

**Physics**

A synchrotron radiation facility consists of a circular ring that has a 48.0 m radius and creates an electron beam with a current of 497 mA when the electrons have a speed approximately equal to the speed of light. How many electrons pass a given point in the accelerator per ...
*Thursday, February 18, 2016 by Alyssa*

**Physics**

There is current of 115 pA when a certain potential is applied across a certain resistor. When that same potential is applied across a resistor made of the identical material but 30 times longer, the current is 0.044 pA. Compare the effective diameters of the two resistors. d2...
*Thursday, February 18, 2016 by Alyssa*

**Physics**

A 14.1 μF capacitor is charged to a potential of 45.0 V and then discharged through an 80.0 Ω resistor. (a) How long after discharge begins does it take for the capacitor to lose 90.0% of the following? (i) its initial charge in seconds (ii) its initial energy in ...
*Thursday, February 18, 2016 by Alyssa*

**Physics**

Please help me!! I need this as soon as possible. 2.A billiard ball at rest is struck by the cue ball of the same mass whose speed is 5 m/s .After an elastic collision the cue ball goes off at 50 degree with respect to its original direction of motion and the struck ball goes ...
*Thursday, February 18, 2016 by Anonymous*

**Physics**

The near and the far points of a short-sighted are 8 cm and 20 cm from the eyeball. a) What power of corrective lens is needed for this eye to see distant objects clearly? b)What will the resulting near point then be?(Assume that the lens is placed very close to the eye) ...
*Thursday, February 18, 2016 by Sophie*

**physics**

find the approximate current density when an electric field of 5v/m is applied to a copper conductor.the conductivity of copper is 59.6*10^6
*Thursday, February 18, 2016 by mat*

**Physics**

A sign is hanging from three ropes. The tension in the lefthand rope, T1, is 460.80 N. Angle θ1=68.9°, and angle θ2=33.8°.What is the tension, T2, in the righthand rope? What is the mass of the sign?
*Thursday, February 18, 2016 by Rachel*

**Physics**

Block A sits on a horizontal tabletop. There is friction between the surface and Block A. The string passes over a frictionless, massless pulley. Block B hangs down vertically. When the two blocks are released, Block B accelerates downward at a rate of 2.030 m/s2. Block A (...
*Thursday, February 18, 2016 by Rachel*

**Physics**

Block A sits on a horizontal tabletop. There is friction between the surface and Block A. The string passes over a frictionless, massless pulley. Block B hangs down vertically. When the two blocks are released, Block B accelerates downward at a rate of 2.030 m/s2. What is the ...
*Thursday, February 18, 2016 by Emily*

**physics**

find the drift velocity of the electrons in the copper wire (there are 8.5*10^28 free electrons per m^3 in copper)
*Thursday, February 18, 2016 by ruth*

**physics**

a copper wire with a diameter of 1.5mm is joined to an aluminium wire which has a diameter of 2.3mm.the wire carries a current of 12A.what is the current density in each wire
*Thursday, February 18, 2016 by mat*

**Physics**

A golf ball hit at a speed of 77 m/s will carry (achieve its maximum flight distance of) 256 m when driven at a launch angle of 16 deg. What would be its horizontal range in a vacuum if launched at the same speed and at the same angle ?
*Thursday, February 18, 2016 by Edwin*

**physics**

A 5.4-kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 3.7 m/s2, find the force exerted by the rope on the bucket.
*Thursday, February 18, 2016 by lisa*

**physics**

A 61-kg man standing on a scale in an elevator notes that as the elevator rises, the scale reads 815 N. What is the acceleration of the elevator? m/s2 upward
*Thursday, February 18, 2016 by lisa*

**physics**

A bag of sugar weighs 3.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? N Repeat for Jupiter, where g is 2.64 times that on Earth. N Find the mass of the bag of sugar in kilograms at each of the three ...
*Thursday, February 18, 2016 by lisa*

**Physics**

A third baseman makes a throw to first base 39.7 m away. The ball leaves his hand with a speed of 37.0 m/s at a height of 1.5 m from the ground and making an angle of 19.5 o with the horizontal. How high will the ball be when it gets to first base?
*Thursday, February 18, 2016 by Edwin*

**Physics **

a helium balloon has a volume of 300 ft^3 and is floating at an altitude where the temperature is 265 K. How high does its temperature have to go for the ballon to expand to 450 ft^3?
*Thursday, February 18, 2016 by Oscar*

**Physics**

A car starts from a certain point at a velocity of 100 kph. After 20 seconds, another car staring from rest, starts at the same point following car A at a uniform acceleration of 3 m/s². Assuming that the road is boundless will car B overtake car A? If yes, where and when?
*Thursday, February 18, 2016 by jerd*

**Physics**

1) If two gliders of equal mass equal and opposite initial veloity collide perfectly elastically, using the given equation, what are the final velocities of the gliders in terms of the initial velocities equations: MaVa + MbVb = MaV'a + MbV'b (momentum) 1/2MaV^2a + 1/...
*Wednesday, February 17, 2016 by Anonymous*

**physics**

A 110 g ball has a kinetic energy 39.8 J. What's the magnitude of its momentum? Use your answer to find its speed. K=p^2/2m 39.8=p^2/(2*110) 8756=p^2 p=93.5735 kg*m/s ^this is wrong though. where did I go wrong?
*Wednesday, February 17, 2016 by lizbeth*

**Physics**

A decibel meter reads 130 dB at a certain position from a jet plane when one engine is turned on. a) What is the sound intensity at that position? b) What would be the sound level at the same position if two engines are turned on each having the same intensity as the first? ...
*Wednesday, February 17, 2016 by Sophie*

**Physics **

Suppose a chinook salmon needs to jump a waterfall that is 1.32 m high. (a) If the fish starts from a distance 1.24 m from the base of the ledge over which the waterfall flows, find the x- and y-components of the initial velocity the salmon would need to just reach the ledge ...
*Wednesday, February 17, 2016 by Jay*

**Physics **

A projectile is launched with an initial speed of 59.0 m/s at an angle of 32.0° above the horizontal. The projectile lands on a hillside 3.80 s later. Neglect air friction. (Assume that the +x-axis is to the right and the +y-axis is up along the page.) (a) What is the ...
*Wednesday, February 17, 2016 by Mary*

**physics**

A 71 kg skater and a 59 kg skater stand at rest on frictionless ice. They push off, and the 71 kg skater moves at 2.5 m/s in the + x-direction. What's the other's velocity?
*Wednesday, February 17, 2016 by lizbeth*

**Physics **

Electrons in a narrow beam travelling at a steady speed of 5 x 10^7 ms^-1 are directed into the space between two oppositely charged parallel plates 50mm apart. The potential difference between the plates is 2500V. The initial direction of the beam is parallel to the plates. ...
*Wednesday, February 17, 2016 by Ben*

**Physics**

The initial velocity of a 2.75 kg block sliding down a frictionless inclined plane is found to be 1.25 m/s. Then 1.05 s later, it has a velocity of 5.31 m/s. What is the angle of the plane with respect to the horizontal? I keep trying to use sine and cosine but I can't ...
*Wednesday, February 17, 2016 by Emily*

**physics**

in an oil drop experiment the radius of the oil patch was found to be 10cm and the volume of the oil used was 1.1*10^-5 cm^3. calculate; 1) the diameter of the film 2) the thickness of the patch 3) the size of the molecule
*Wednesday, February 17, 2016 by hasahya pius*

**Physics/Eletrical engineering**

Which of the following is a conducting loop in which electrons carrying electric energy may be transferred from a suitable source to do a useful work and returned to the source? a.) Direct current b.) Indirect current c.) Electric circuit d.) source of energy
*Wednesday, February 17, 2016 by A-Yo*

**Physics**

A point charge (m = 1.0 g) at the end of an insulating string of length L = 51 cm (Fig. 16-66) is observed to be in equilibrium in a uniform horizontal electric field of E = 9200 N/C, when the pendulum's position is as shown in Fig. 16-66, with the charge d = 1.0 cm above ...
*Wednesday, February 17, 2016 by Anonymous*

**Physics**

A point charge (m = 1.0 g) at the end of an insulating string of length L = 51 cm (Fig. 16-66) is observed to be in equilibrium in a uniform horizontal electric field of E = 9200 N/C, when the pendulum's position is as shown in Fig. 16-66, with the charge d = 1.0 cm above ...
*Wednesday, February 17, 2016 by Cici*

**Physics**

A body P of mass 5kg moving with a velocity of 30M/s collids with another body q moving in opposite direction with a velocity of 20m/s.If the bodies now move in the direction of P at velocity 10m/s.calculate the mass of q
*Wednesday, February 17, 2016 by Datu*

**physics**

A machine with v.r requires 1000J of work to raise a load of 500N through a vertical distance of 1.7m . find the efficiency and m.a of the machine.
*Wednesday, February 17, 2016 by Azeez*

**physics**

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3580-kg space tug and a 6000-kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 400 m ...
*Wednesday, February 17, 2016 by Desi*

**Physics - Electrons (Inside the atom)**

A beam of electrons is directed into uniform electric and magnetic feilds that are at right angles to one another and to the beam direction. The strength of the magnetic feild is 55 mT; the electric feild strength is adjusted to 600 kV m^-1 when the beam passed through the ...
*Wednesday, February 17, 2016 by Ben*

**Science Physics**

A rope exerts a 274N force on an 80kg skier up along a hill inclined 12 degrees. A frictional force of 100N opposed the motion. If the skier starts from rest, what is her speed after travelling 100m?
*Wednesday, February 17, 2016 by Yoda*

**physics **

Three capacitors are connected to a battery of unknown voltage as shown in the circuit diagram above. The voltage drop across capacitor C 1 is V 1 = 11 . volts. a) What is the effective capacitance of the three capacitors? c) What is the voltage of the battery? d) Which ...
*Wednesday, February 17, 2016 by selina*

**physics**

determine the a)charge on the capacitor b)voltage across the capacitor c)current through the resistor after t=rc when a capacitor is getting charged interms of their peak values
*Wednesday, February 17, 2016 by selina*

**physics**

a rifle bullet of mass 8.0g strikes and embeds itself in a block of mass 0.992kg that rests on a frictionless horizontal surface and is attached to a coil spring. the impact compresses the spring 15.0cm. calibration of the spring shows that a force of 0.750N is required to ...
*Wednesday, February 17, 2016 by #PAKIsagotPARAbukas*

**PHYSICS**

Mass of empty bucket of capacity 10 liter is 1 kg. find its mass when completely with a liquid of relative density 0.8
*Wednesday, February 17, 2016 by IMTEYAZ KHAN*

**PHYSICS**

Mass of empty bucket of capacity 10 liter is 1 kg. find its mass when completely with a liquid of relative density .08
*Wednesday, February 17, 2016 by IMTEYAZ*

**physics**

A bullet has a mass of 5g leave a gun at a velocity of 100m/s. What is the kinetic energy of the bullet as it leave the gun? If the gun is fired vertically upwards, how high will the bullet go? (Ignore air resistance and assume g=10m/s2).
*Wednesday, February 17, 2016 by Anonymous*

**Physics**

A hoop starts from rest at a height 1.8 m above the base of an inclined plane and rolls down under the influence of gravity. What is the linear speed of the hoop's center of mass just as the hoop leaves the incline and rolls onto a horizontal surface? (Neglect friction.) I...
*Tuesday, February 16, 2016 by David*

**physics**

a ball is launched from the top of a 23 m high cliff with a velocity of 33 m/s oriented 12 degrees above the horizonal. Determine the time it takes for the ball to hit the ground.
*Tuesday, February 16, 2016 by clyde*

**Physics**

A uniform disk of radius 0.45 m is mounted on a frictionless, horizontal axis. A light cord wrapped around the disk supports a 1 kg object, as shown. When released from rest the object falls with a downward acceleration of 4.5 m/s^2. What is the moment of inertia of the disk? ...
*Tuesday, February 16, 2016 by Nate*

**physics **

1. The position of a particle is given by x= At2 + Beαt, the particle is initially at x = -2.0m with v = 4.0 m/s at t = 0s. After 0.2 s, the velocity is observed to be 5 m/s. What is the acceleration after 1.0s?
*Tuesday, February 16, 2016 by eduardo*

**Physics **

A 1500 kg car accelerates from rest under the actions of two forces. One is a forward force of 1260 N provided by traction between the wheels and the road. The other is a 870 N resistive force due to various frictional forces. Use the work-energy theorem to determine how far ...
*Tuesday, February 16, 2016 by Megan y*

**physics**

A piece of luggage is being loaded onto an airplane by way of an inclined conveyor belt. The bag, which has a mass of 15.0 kg, travels 4.50 m up the conveyor belt at a constant speed without slipping. If the conveyor belt is inclined at a 30.0° angle, calculate the work ...
*Tuesday, February 16, 2016 by nick*

**Physics **

A1500 kg car accelerates from rest under the actions of two forces. One is a forward force of 1260 N provided by traction between the wheels and the road. The other is a 870 N resistive force due to various frictional forces. Use the work-energy theorem to determine how far ...
*Tuesday, February 16, 2016 by Megan y*

**physics**

A 1180 kg car and 4720 kg truck undergo a perfectly inelastic collision. Before the collision, the car was traveling southward at 1.45 m/s , and the truck westward at 8.80 m/s. Find the velocity of the wreckage immediately after the collision. Enter the x and y components of ...
*Tuesday, February 16, 2016 by lizbeth*

**physics**

im new i need help with a question but scared to ask here the question may some1 explain but dont tell the answer How do the principles of convection, conduction, and radiation explain how the water in the saucepan gets hot?
*Tuesday, February 16, 2016 by tank*

**Physics **

What release height would be required for a 5 micrometer spherical spore to drift from africa to south america (distance =3200km)? assume spore density is 1.2. assume steady 6m/sec horizontal wind from africa to s.america.
*Tuesday, February 16, 2016 by Anna*

**Physics**

A 4.96 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.7N at an angle theta=16.0degrees above the horizontal. What is the magnitude of the acceleration of the block when the force is applied? I know a=F/m
*Tuesday, February 16, 2016 by Emily*

**Physics**

Three blocks are located on a horizontal frictionless table. They are connected by a massless cord, as shown in the figure, and pulled to the right. The masses of the three blocks are m1 = 8 kg, m2 = 33 kg, and m3 = 49 kg. The pulling force is equal to T3 = 89 N. What is the ...
*Tuesday, February 16, 2016 by Emily*

**Physics**

An elevator (cabin mass 600 kg) is designed for a maximum load of 2700 kg, and to reach a velocity of 3.4 m/s in 5 s. For this scenario, what is the tension the elevator rope has to withstand? I know I have to multiply the mass by the acceleration. I'm having a hard time ...
*Tuesday, February 16, 2016 by Emily*

**physics**

Which of the following ; if either, produces the larger change in kinetic energy; a force of 6 newtons acting through a distance of 3 meters or a force of 3 newtons acting through a distance of 6 meters.
*Tuesday, February 16, 2016 by Mario*

**AP Physics 1**

If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, how much does it cost to operate an electric over for 5.0 h if it carries a current of 20.0 A at 220 V?
*Tuesday, February 16, 2016 by Akanksha*

**physics **

Calculate the amount of heat required to raise the temperature of 1kg of water from 30 degrees celsius to 60 degrees Celsius
*Tuesday, February 16, 2016 by g*