Tuesday

November 24, 2015
**AP Physics**

A car enters the freeway with a speed of 6.9 m/s and accelerates uniformly for 2.7 km in 3,7 min. How fast is the car moving after this time? Answer in units of m/s.
*Sunday, September 27, 2015 by Natasha*

**Physics**

In the figure below the left-hand cable has a tension T1 and makes an angle of 45 ◦ with the horizontal. The right-hand cable has a tension T3 and makes an angle of 48 ◦ with the horizontal. A W1 weight is on the left and a W2 weight is on the right. The cable ...
*Sunday, September 27, 2015 by Josh*

**physics**

the magnitude of vector A is 35 units and points in the direction 325 degrees counterclockwise from the positive X-axis. calculate the X and y components of the vector
*Sunday, September 27, 2015 by nelson*

**Physics-Urgent**

A sign with a mass of 23 kg is hanging in two wires both making an angle of 27 degrees with the vertical. Find the tension in one of the wires. Give your answer in newtons (N) and with 3 significant figures.
*Sunday, September 27, 2015 by Anonymous*

**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, September 27, 2015 by Kitty*

**Physics, math**

What is the answer to this? I don't understand how to solve it. 1.2 = 4.6 tan 50 - 4.9 (4.6^2)/(x^2 cos^2 50)
*Sunday, September 27, 2015 by Taylor*

**Physics**

A basketball player shoots a free throw at a 50 degree angle. Assume the ball is released at a height of 1.8 meters, the hoop is 3 meters off of the floor and 4.6 meters away from the shooter. With what velocity should the player release the ball to hit nothing but net? I have...
*Sunday, September 27, 2015 by Taylor*

**science- physics**

A car is traveling at a steady 90 km/h in a 50 km/h zone. A police motorcycle takes off at the instant the car passes it, accelerating at a steady 7.3 m/s/s.How much time elapses before the motorcycle is moving as fast as the car? How far is the motorcycle from the car when it...
*Sunday, September 27, 2015 by Laura*

**Physics**

A basketball player shoots a free throw at a 50 degree angle. Assume the ball is released at a height of 1.8 meters, the hoop is 3 meters off of the floor and 4.6 meters away from the shooter. With what velocity should the player release the ball to hit nothing but net?
*Sunday, September 27, 2015 by Taylor*

**Physics**

A fireman d = 33.0 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of θi = 21.0° above the horizontal as shown in the figure. If the speed of the stream as it leaves the hose is vi = 40.0 m/s, at what height will the ...
*Sunday, September 27, 2015 by James*

**physics**

Shoes made for the sports of bouldering and rock climbing are designed to provide a great deal of friction between the foot and the surface of the ground. Such shoes on smooth rock might have a coefficient of static friction of 1.2 and a coefficient of kinetic friction of 0.90...
*Sunday, September 27, 2015 by xxx*

**physics**

a body is at equlibrium under the action of three forces.one force is 10n acting due east and one is 5n in the direction 60degree north east.what is the magnitude and direction of the third force.
*Sunday, September 27, 2015 by mfoniso*

**physics**

if a girl walks 30m northwards from point A-B and then 40m eastwards to point C.What is her total displacement and distance?
*Sunday, September 27, 2015 by christain*

**Physics**

To ward off oceanic invaders, a cannon is placed 10 meters from the water's edge, pointing out at sea. The cannon is capable of firing a projectile at a maximum velocity of 100m/s. a) what is the maximum firing range of the cannon? b)If the cannon was placed on a cliff ...
*Sunday, September 27, 2015 by :(*

**Physics**

A rifle bullet, traveling at "v1" strikes a large tree an penetrates to a depth of "d". the mass of the bullet is "m". assume the de-acceleration is constant as it penetrates the tree. a) the time required to stop. b) the de-acceleration of the ...
*Sunday, September 27, 2015 by John*

**physics**

A quarterback takes the ball from the line of scrimmage, runs backwards for 9.0 yards, then runs sideways parallel to the line of scrimmage for 17.0 yards. At this point, he throws a 46.0-yard forward pass straight downfield, perpendicular to the line of scrimmage. What is the...
*Sunday, September 27, 2015 by Anonymous*

**physics **

NASA launches a satellite into orbit at a height above the surface of the Earth equal to the Earth's mean radius. The mass of the satellite is 550 kg. (Assume the Earth's mass is 5.97 1024 kg and its radius is 6.38 106 m.) (a) How long does it take the satellite to go ...
*Sunday, September 27, 2015 by Kristen *

**Physics**

Two charges are placed on the x axis. One of the charges (q1 = +5.44C) is at x1 = +3.00 cm and the other (q2 = -27.7C) is at x2 = +9.00 cm. Find the net electric field (magnitude and direction given as a plus or minus sign) at (a) x = 0 cm and (b) x = +6.00 cm.
*Sunday, September 27, 2015 by Anonymous*

**Physics**

A uniform electric field exists everywhere in the x, y plane. This electric field has a magnitude of 5600 N/C and is directed in the positive x direction. A point charge -9.6 × 10-9 C is placed at the origin. Find the magnitude of the net electric field at (a) x = -0.20 ...
*Sunday, September 27, 2015 by Anonymous*

**Physics**

A mover has to move a heavy sofa of mass 146 kg to the second floor of the house. He uses a rope to pull the sofa up a ramp from the first to the second floor. As he pulls the sofa he makes sure that the rope is parallel to the surface of the ramp which is at 30.0° to the ...
*Sunday, September 27, 2015 by Anna*

**physics **

a mass of 15kg was suspended from a ceiling is pulled aside with a horizontal force,F, calculate the value of tension, T. (g=10m/s)
*Sunday, September 27, 2015 by prince *

**Physics**

The figure below represents part of the performance data of a car owned by a proud physics student. (The horizontal axis is marked in increments of 1 s and the vertical axis is marked in increments of 10 m/s.) f (a) Calculate the total distance traveled by computing the area ...
*Sunday, September 27, 2015 by Kaleem*

**Physics**

A concrete sidewalk is constructed between two buildings on a day when the temperature is 25 0C. The sidewalk is 6 m long and consists of two slabs each 3 m in length and of negligible thickness. What would be amount of buckling (displacement) upwards that will occur in the ...
*Sunday, September 27, 2015 by Pam*

**physics **

if two forces 10N and 20N are inclined at angle 60degree to each other. Find the resultant force.
*Sunday, September 27, 2015 by John*

**Physics**

An automobile uniformly accelerates from rest at 15 ft/s2 for 6s. What is the fanal velocity in ft/s? v=d/t 15 *6= 90 90ft/s
*Sunday, September 27, 2015 by RP*

**physics**

A man walks 30km east ward and 35km north ward what is the resultant displacement of the man,as well as his direction
*Sunday, September 27, 2015 by chika nsitem*

**Physics**

How do I calculate the upper limit and lower limits in order to obtain F(max)and F(min)for the problem below. Using the force F = (1/2)CApv^2 on the car due to air friction. Consider a car with front cross-sectional area of A=(1.77 ± 0.02)m^2 and a drag coefficient of C...
*Sunday, September 27, 2015 by NONEE*

**physics - engine**

A car V8 has a bore of 4 in. and a stroke of 2.5 in., what is the engine size?
*Saturday, September 26, 2015 by kim*

**Physics**

A 41 kg child sits in a swing supported by two chains, each 1.4 m long. If the tension in each chain at the lowest point is 261 N, find the child’s speed at the lowest point. (Neglect the mass of the seat.) Find the force of the seat on the child at the lowest point.
*Saturday, September 26, 2015 by Maddie*

**Physics**

Forces of 10.3N north, 19.5N east, and 15.2N south are simultaneously applied to a 4.06kg mass as it rests on an air table. What is the magnitude of its acceleration?
*Saturday, September 26, 2015 by King*

**Physics**

A rock is projected vertically upward with a velocity of 58.0 m/s. How many metres will it pass over in the third second of its upward travel ?
*Saturday, September 26, 2015 by Mike*

**Physics**

The slab of steel shown below is being lifted at 0.50 m/s. It weighs 1.91×103N. If the angle θ equals 61.4 degrees, what is the tension in each cable?
*Saturday, September 26, 2015 by Jack*

**PHYSICS**

1.)what is the magnitude of the force experienced by a proton moving at 3 km/s inside magnetic field of strength 0.05T 2.)an electron is moving at 2x10^5 m/s through a uniform magnetic field of 1.4x10^-3 T.what is the magnitude of magnetic force if the velocity of the electron...
*Saturday, September 26, 2015 by Anonymous*

**PHYSICS**

1.)what is the magnitude of the force experienced by a proton moving at 3 km/s inside magnetic field of strength 0.05T 2.)an electron is moving at 2x10^5 m/s through a uniform magnetic field of 1.4x10^-3 T.what is the magnitude of magnetic force if the velocity of the electron...
*Saturday, September 26, 2015 by Slow*

**Physics**

A sound wave travels a distance 1020 m in 5 minutes. If the length of the three successive crests is 15 m, then calculate the wave speed. "Length of three crests"? I'm not sure about that. Is the question okay? I'm confused. :/
*Saturday, September 26, 2015 by Kip*

**University physics**

Hi. Can someone please help me on how to perform error analysis on the formulas: r = 1/C, with an error on C.
*Saturday, September 26, 2015 by NONEE*

**physics**

Consider a carwith front cross-sectional area of A=(1.77 ± 0.02)m^2 and a drag coefficient of C=(0.38±-0.02) moving with a speed of v=(10.0±0.5)m/s. Suppose that the density of air is p=1.20 kg/m^3 at the sea level. 1.Calculate the force F=(1/2)CApv^2 on ...
*Saturday, September 26, 2015 by NONEE*

**physics**

Perform error analysis on the following formulas: (a)∆ = áô, with errors á on and ô (b)r = 1/C, with an error on C (c)r = 1/n, with an error on n (d)k = Cd/åA , with errors on C, d and A
*Saturday, September 26, 2015 by nonee*

**Physics**

A 124-kg balloon carrying a 22-kg basket is descending with a constant downward velocity of 25.2 m/s A 1.0-kg stone is thrown from the basket with an initial velocity of 11.7 m/s perpendicular to the path of the descending balloon, as measured relative to a person at rest in ...
*Friday, September 25, 2015 by daniela*

**physics**

Consider a carwith front cross-sectional area of A=(1.77 ± 0.02)m^2 and a drag coefficient of C=(0.38±-0.02) moving with a speed of v=(10.0±0.5)m/s. Suppose that the density of air is p=1.20 kg/m^3 at the sea level. Make a table showning the forces due to ...
*Friday, September 25, 2015 by Megameno*

**physics**

Consider a carwith front cross-sectional area of A=(1.77 ± 0.02)m^2 and a drag coefficient of C=(0.38±-0.02) moving with a speed of v=(10.0±0.5)m/s. Suppose that the density of air is p=1.20 kg/m^3 at the sea level. calculate the force F=(1/2)CApv^2 on the...
*Friday, September 25, 2015 by Megameno*

**physics**

A novice golfer on the green takes three strokes to sink the ball. The successive displacements are 3.6 m to the north, 2.8 m 45◦ north of east, and 2.2 m 59◦ west of south. Starting at the same initial point, an expert (lucky) golfer could make the hole in a ...
*Friday, September 25, 2015 by shannon*

**physics**

A knight sits on a castle wall during a siege.To while away the time, he notes that boulders catapulted from below land on the top of his wall with a vertical velocity of 9.9 m/s. If he is 35 m above the catapult, what is the initial velocity of the boulders? Theacceleration ...
*Friday, September 25, 2015 by zach*

**physics**

A ball is thrown straight up and reaches a maximum height of 7.16 m. What was its initial speed? The acceleration of gravity is 9.8 m/s Answer in units of m/s.
*Friday, September 25, 2015 by zach*

**Physics help!!**

A plane is flying horizontally at constant speed, vo. when it releases a package. The package lands on the ground at t seconds later. Just before the package lands... a. What is its horizontal component of velocity? Leave in terms of vo and t. b. What is its vertical component...
*Friday, September 25, 2015 by jeff*

**physics**

Consider a carwith front cross-sectional area of A=(1.77 ± 0.02)m^2 and a drag coefficient of C=(0.38±-0.02) moving with a speed of v=(10.0±0.5)m/s. Suppose that the density of air is p=1.20 kg/m^3 at the sea level. calculate the force F=(1/2)CApv^2 on the...
*Friday, September 25, 2015 by megameno*

**Physics**

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 23.0° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 55.3 kg, and the coefficient of kinetic ...
*Friday, September 25, 2015 by Tia*

**physics**

How much time does a passerby on the sidewalk below have to move out of the way before the flowerpot hits the ground? Answer in units of s.
*Friday, September 25, 2015 by Anonymous*

**physics**

A flowerpot falls from a window sill 38.5 m above the sidewalk. What is the velocity of the flowerpot when it strikes the ground? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s.
*Friday, September 25, 2015 by Anonymous*

**Physics**

Projectile motion problem where a projectile is launched from level ground and lands on level ground. I have to use the kinematic equations to show that the time it takes for the projectile to reach its maximum height is equal to one half of the the total flight time.
*Friday, September 25, 2015 by Anon2013*

**physics**

A tennis ball is thrown vertically upward with an initial velocity of +7.5 m/s. What will the ball’s velocity be when it returns to its starting point? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s.
*Friday, September 25, 2015 by Anonymous*

**physics**

A robot probe drops a camera off the rim of a 323 m high cliff on Mars, where the free-fall acceleration is 3.7 m/s2 . Find the velocity with which it hits the ground. Answer in units of m/s.
*Friday, September 25, 2015 by Anonymous*

**Physics**

Two point charges are on the y-axis, one of magnitude 3.0 * 10^-9 C at y= 10cm and a second of magnitude 6.0 * 10^-9 at the point y=30cm. Calculate the potential at y= 60cm.
*Friday, September 25, 2015 by Casanova*

**physics**

A certain car is capable of accelerating at a uniform rate of 0.83 m/s2 . What is the magnitude of the car’s displacement as it accelerates uniformly from a speed of 80 km/h to one of 92 km/h?
*Friday, September 25, 2015 by Anonymous*

**physics**

a bullet is fired vertically upward from a gun at a velocity of 150m/s.taking g to be 10m/s calculate the gretest heigt reached and at what time and the time the bullet will enter the gun and at what velocity
*Friday, September 25, 2015 by cecil*

**physics**

A certain car is capable of accelerating at a uniform rate of 0.83 m/s2 . What is the magnitude of the car’s displacement as it accelerates uniformly from a speed of 80 km/h to one of 92 km/h?
*Friday, September 25, 2015 by Anonymous*

**Physics **

A 130-m-wide river flows due east at a uniform speed of 4.1m/s. A boat with a speed of 6.6m/s relative to the water leaves the south bank pointed in a direction 29o west of north. What is the (a) magnitude and (b) direction of the boat's velocity relative to the ground? ...
*Friday, September 25, 2015 by barich*

**Physics **

A boat is traveling upstream at 13 km/h with respect to the water of a river. The water is flowing at 9.0 km/h with respect to the ground. What are the (a) magnitude and (b) direction of the boat’s velocity with respect to the ground? A child on the boat walks from front ...
*Friday, September 25, 2015 by barich*

**Physics **

A boy whirls a stone in a horizontal circle of radius 2.0 m and at height 2.2 m above level ground. The string breaks, and the stone flies off horizontally and strikes the ground after traveling a horizontal distance of 9.7 m. What is the magnitude of the centripetal ...
*Friday, September 25, 2015 by barich*

**Physics **

A woman rides a carnival Ferris wheel at radius 20 m, completing 4.8 turns about its horizontal axis every minute. What are (a) the period of the motion, and the magnitude of her centripetal acceleration at (b) the highest point and (c) the lowest point?
*Friday, September 25, 2015 by barich*

**Physics **

In 1939 or 1940, Emanuel Zacchini took his human-cannonball act to an extreme: After being shot from a cannon, he soared over three Ferris wheels and into a net (see the figure). Assume that he is launched with a speed of 29 m/s and at an angle of 59°. (a) Treating him as ...
*Friday, September 25, 2015 by barich*

**Physics **

A rifle that shoots bullets at 447 m/s is to be aimed at a target 40.7 m away. If the center of the target is level with the rifle, how high above the target must the rifle barrel be pointed so that the bullet hits dead center?
*Friday, September 25, 2015 by barich*

**Physics **

A trebuchet was a hurling machine built to attack the walls of a castle under siege. A large stone could be hurled against a wall to break apart the wall. The machine was not placed near the wall because then arrows could reach it from the castle wall. Instead, it was ...
*Friday, September 25, 2015 by barich*

**Physics **

A certain airplane has a speed of 336.8 km/h and is diving at an angle of θ = 32.0° below the horizontal when the pilot releases a radar decoy (see the figure). The horizontal distance between the release point and the point where the decoy strikes the ground is d = ...
*Friday, September 25, 2015 by barich*

**Physics **

A particle leaves the origin with an initial velocity v Overscript right-arrow EndScripts equals left-parenthesis 7.34 i Overscript ̂ EndScripts right-parenthesis m divided by s and a constant acceleration a Overscript right-arrow EndScripts equals left-parenthesis ...
*Friday, September 25, 2015 by barich*

**Physics **

The position ModifyingAbove r With right-arrow of a particle moving in an xy plane is given by ModifyingAbove r With right-arrow equals left-parenthesis 3 t cubed minus 2 t right-parenthesis ModifyingAbove i With caret plus left-parenthesis 5 minus 2 t Superscript 4 Baseline ...
*Friday, September 25, 2015 by barich*

**Physics - URGENT**

Four forces are acting on an object in static equilibrium: Force 1 has a magnitude of 46.0 N and is acting at an angle of 52 degrees above the positive x-axis. Force 2 has a magnitude of 29 N and is acting along the positive x-axis. Force 3 has a magnitude of 34.5 N and is ...
*Friday, September 25, 2015 by Anonymous*

**Physics**

The substation bus bar is made up of 2-iches round copper bars 20 ft. long. What is the resistance of each bar if resistivity is 1.724 x 10-6 ohm-cm.
*Friday, September 25, 2015 by Jhun*

**Physics**

An incline is divided into 6 equal lengths. Starting from rest a ball accelerates down the incline. It takes 0.21 seconds to reach the first tape marker, a distance of 0.15 meter.
*Friday, September 25, 2015 by Sarah*

**Physics**

A car is braked so that it slows down with uniform retardation from 15 m/s to 7 m/s while it travels a distance of 88 m. If the car continues to slow down at the same rate, after what further distance will it be brought to rest?
*Friday, September 25, 2015 by Manish*

**physics**

realation between earth gravity and moon gravity
*Thursday, September 24, 2015 by kv*

**Physics**

A 75 kg rock climber is attached to a rope that is allowing her to hang horizontally with her feet against the wall. The tension in the rope is 825 N and the rope makes a 35 degree angle with the vertical. Determine the force exerted by the wall on the climbers feet.
*Thursday, September 24, 2015 by Dawson*

**Physics**

Three boxes A, B, and C are placed on a frictionless surface as shown in the diagram below. If you push on box A with a force of 8.25 N, find the magnitude of the contact force between each pair of boxes. Here mA = 6.90 kg, mB = 3.80 kg, and mC = 1.50 kg. contact force between...
*Thursday, September 24, 2015 by Anonymous*

**Physics**

A mover has to move a heavy sofa of mass 49.0 kg to the second floor of the house. As he pulls on the rope tied to the sofa, he makes sure that the rope is parallel to the surface of the ramp, which is at 30.0° to the horizontal. If the coefficient of kinetic friction ...
*Thursday, September 24, 2015 by Anonymous*

**Physics**

ou are helping your friend move a new refrigerator into his kitchen. You apply a horizontal force of F = +214i − 171k N to try and move the 64.0-kg refrigerator. The coefficient of static friction is 0.660. (a) How much static frictional force does the floor exert on the...
*Thursday, September 24, 2015 by Anonymous*

**Physics**

Three boxes A, B, and C are placed on a frictionless surface as shown in the diagram below. If you push on box A with a force of 8.25 N, find the magnitude of the contact force between each pair of boxes. Here mA = 6.90 kg, mB = 3.80 kg, and mC = 1.50 kg.
*Thursday, September 24, 2015 by Anonymous*

**Physics**

A two-slit pattern is viewed on a screen 1.08 m from the slits. If the two fourth-order maxima are 52.8 cm apart, what is the total width of the central bright fringe?
*Thursday, September 24, 2015 by Rachel*

**physics**

the gravitational force on an object on the surface of the earth is F , what's the gravitational force on the satelite when at height R/20, where R is the radius of the Earth ?
*Thursday, September 24, 2015 by edward*

**physics**

My answer doesn't make sense. I will show question then my work: A city holding tank for water sits 20 m above the city. If a house was on fire 15 m away from the base of the holding tank, and the tank was originally filled to a depth of 15 m, to what depth would ...
*Thursday, September 24, 2015 by Jackie*

**Physics**

A mover has to move a heavy sofa of mass 49.0 kg to the second floor of the house. As he pulls on the rope tied to the sofa, he makes sure that the rope is parallel to the surface of the ramp, which is at 30.0° to the horizontal. If the coefficient of kinetic friction ...
*Thursday, September 24, 2015 by Madison*

**physics**

My answer doesn't make sense. I will show question then my work: A city holding tank for water sits 20 m above the city. If a house was on fire 15 m away from the base of the holding tank, and the tank was originally filled to a depth of 15 m, to what depth would ...
*Thursday, September 24, 2015 by Jackie*

**physics**

A shuffleboard disk is accelerated at a constant rate from rest to a speed of 4.6 m/s over a 1.4 m distance by a player using a cue. At this point the disk loses contact with the cue and slows at a constant rate of 2.6 m/s2 until it stops. (a) How much time elapses from when ...
*Thursday, September 24, 2015 by Hirak*

**Physics**

What weight could be supported by a rotating object if it had a mass of 98 grams and if it were revolving in a horizontal circle, 50 cm diameter, and making 240 rev/min?
*Thursday, September 24, 2015 by Talmadge*

**physics**

Copy of Vector A has a magnitude of 5 and is at an angle of 29.7 degrees measured counter-clockwise from the x axis. Vector B has a magnitude of 12 and is at an angle of 115.4 degrees measured counter-clockwise from the x axis. Vector C has a magnitude of 18 and is at an angle...
*Thursday, September 24, 2015 by sally*

**physics**

While curling, you push a rock for 1.70 m and release it when it has a speed of 2.40 m/s. It continues to slide at constant speed for 1.40 s and then hits a rough patch of ice. It finally comes to rest 7.20 m from where it was released. What was the curling rock's ...
*Thursday, September 24, 2015 by niro*

**Physics?**

consider two solid cones made from a uniform material. The smaller cone is a ½ scale model of the bigger one. They are released from equal height, quickly reach their terminal velocities and fall in air until they hit the ground. Use scaling reasoning to predict which ...
*Thursday, September 24, 2015 by Jay*

**PHYSICS**

an electron is moving at 2x10^5 m/s through a uniform magnetic field of 1.4x10^-3 T.what is the magnitude of magnetic force if the velocity of the electron and the field make an angle of 45 degree.
*Thursday, September 24, 2015 by please help w/ complete sol'n.*

**physics**

While standing on top of a 323 m tall building, you see Iron Man flying straight down toward the ground at a speed of 35.0 m/s. Just as he passes you, you drop a can of Dr Pepper off the roof. How fast is the can going when it passes Iron Man?
*Thursday, September 24, 2015 by niro*

**Physics **

A car, moving along a straight stretch of high- way, begins to accelerate at 0.014 m/s2. It takes the car 23.2 s to cover 1 km. How fast was the car going when it first began to accelerate? Answer in units of m/s.
*Thursday, September 24, 2015 by Bob*

**physics **

During an Apollo lunar landing mission, the command module continued to orbit the Moon at an altitude of about 113 km. How long did it take to go around the Moon once?
*Thursday, September 24, 2015 by kirsten*

**Physics **

2) Which of the following quantities has the same dimensions as a distance? a. vt b. 1/2 at^2 c. 2at d. v^2/a v=speed, t=time a=acceleration. 3) which of the following quantities has the same dimensions as speed a. 1/2 at^2 b. at c.(2x/a)^1/2 d. (2ax)^1/2 v=speed, t=time a=...
*Thursday, September 24, 2015 by anonymous *

**Physics **

1) use dimensional analysis to determine which of the following expressions gives the area of a circle: is it pie r ^2, or 2 pie r? explain - pie r^2 right?? because its what they normally use to find area of a circle 2) If a distance d has units of meters and a time T has ...
*Thursday, September 24, 2015 by anonymous *

**Physics**

A sound wave with a frequency of 260 Hz moves with a velocity of 343 m/s through air. What is the distance from one condensation region (area of maximum pressure) to the next?
*Thursday, September 24, 2015 by Tori*

**Physics**

A student drops a rock from a bridge to the water 12.0 meters below. With what speed does the rock hit the water?
*Thursday, September 24, 2015 by Sarah*

**Physics. **

How do I find how long it takes to drain one half of the initial volume of the conical tank . and what fraction of the full drain time is it?
*Thursday, September 24, 2015 by Jay*

**Noun**

physics: pls!!!!! i need ur help. in an experiment to verify Newton's law of cooling, the temperature of hot water in a calorimeter $T/^{o}C$ is plotted against time t/min. Which of the following is true about the graph? (a) The graph is linear and parallel to the T-axis...
*Thursday, September 24, 2015 by basil*

**physics**

A baseball player standing on the ground throws a ball straight up. The ball leaves the player's hand with a speed of 15.5 m/s and is in the air for 3.30 s before hitting the ground. How high above the ground was the baseball player's hand when he released the ball?
*Thursday, September 24, 2015 by niro*

**Physics**

A certain car is capable of accelerating at a uniform rate of 0.83 m/s2 . What is the magnitude of the car’s displacement as it accelerates uniformly from a speed of 80 km/h to one of 92 km/h? Answer in units of m.
*Thursday, September 24, 2015 by jon*

**Physics**

An 8 kg mass is supported by an aluminum wire of length 80 cm abd diameter 2.0mm. How much will the wire stretch?
*Thursday, September 24, 2015 by Grace*

**physics **

A train at a constant 43.0 km/h moves east for 20.0 min, then in a direction 54.0° east of due north for 25.0 min, and then west for 30.0 min. What are the (a) magnitude and (b) angle (relative to east) of its average velocity during this trip?
*Thursday, September 24, 2015 by barich*