Tuesday

February 9, 2016
**physics **

what is the electric flux through a sphere that has a radius of 2.2m and carries charge of 5.3 micro couloumb at its centre? solution
*Tuesday, February 9, 2016 by Temitope *

**Physics**

Suppose that 4.7 moles of a monatomic ideal gas (atomic mass = 8.5 × 10^-27 kg) are heated from 300K to 500K at a constant volume of 0.47 m^3. It may help you to recall that CVCV = 12.47 J/K/mole and CPCP = 20.79 J/K/mole for a monatomic ideal gas, and that the number of...
*Tuesday, February 9, 2016 by Billy*

**Physics**

A tank holds 135 moles of argon gas (atomic mass = 6.633521 × 10^-26 kg) at a pressure of 101300 Pa and a temperature of 302K. Recall that the number of gas molecules is equal to Avagadros number (6.022 × 10^23) times the number of moles of the gas 1) What is the ...
*Tuesday, February 9, 2016 by Billy*

**Physics**

A cylinder with a movable piston contains 14 moles of a monatomic ideal gas at a pressure of 2.26 × 105 Pa. The gas is initially at a temperature of 300 K. An electric heater adds 52600 J of energy into the gas while the piston moves in such a way that the pressure ...
*Tuesday, February 9, 2016 by Billy*

**Physics**

A tank with a constant volume of 3.44 m3 contains 14 moles of a monatomic ideal gas. The gas is initially at a temperature of 300 K. An electric heater is used to transfer 52600 J of energy into the gas. It may help you to recall that CVCV = 12.47 J/K/mole for a monatomic ...
*Tuesday, February 9, 2016 by Leul*

**Physics**

A steel washer is suspended inside an empty shipping crate from a light string attached to the top of the crate. The crate slides down a long ramp that is inclined at an angle of 40 ∘ above the horizontal. The crate has mass 162 kg . You are sitting inside the crate (...
*Tuesday, February 9, 2016 by Denny*

**physics**

A 10.7 g mass is attached to a horizontal spring with a spring constant of 12.6 N/m and released from rest with an amplitude of 37.8 cm. What is the speed of the mass when it is halfway to the equilibrium position if the surface is frictionless?
*Tuesday, February 9, 2016 by sydney*

**Physics**

x = 2t^3 - 21t^2 + 60t - 30 is the motion of an ant where x is his location on the number line at time t seconds. 1) When is he going to the left? Answer: between 3 to 5 seconds 2) When is he going to the right? Answer: between 0 to 2 seconds 3) What is his net displacement ...
*Tuesday, February 9, 2016 by Udi*

**Physics**

A plate made of steel has a 18.9979 mm diameter hole cut into it. A 19.0000 mm diameter ball made of glass is sitting in the hole. Both are at an initial temperature of 9.00 deg. C. If the plate and ball are both heated, at what temperature will the ball just fit through the ...
*Monday, February 8, 2016 by Brooke*

**physics**

A tennis ball is served 2.00 degrees above the horizontal at a height of 2.40 meters, 12.0 meters from a net that is 0.900 meters high. (a) If the tennis ball is to clear the net by at least 0.200 meters, what is its minimum initial velocity? (b) If the tennis ball clears the ...
*Monday, February 8, 2016 by tamara*

**Physics mechanics**

Two identical 17.7-kg balls, each 23.9 cm in diameter, are suspended by two 35.0-cm wires as shown in the figure (Figure 1) . The entire apparatus is supported by a single 18.0-cm wire, and the surfaces of the balls are perfectly smooth. what is the tension in the top wire?
*Monday, February 8, 2016 by joshua*

**Physics**

I have a few physics questions that I don't understand. Two are thermal expansion problems and the other is an ideal gas law problem. 1. Two rods, one made of iron and the other of aluminum, have the same initial length at 64.00 deg. C? When the temperature drops to 4.00 ...
*Monday, February 8, 2016 by Alyssa*

**Physics **

Calculate the speed with which a swimmer enters water if she slides down a frictionless ramp that is 2.6 m high
*Monday, February 8, 2016 by Tony*

**physics**

Canadian snowbirds usually follow the I-15 at a speed of about 120 kilometers per hour. Canadian geese, on the other hand, migrate approximately along a north-south direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100 kilometers per ...
*Monday, February 8, 2016 by tom*

**physics**

A game of tennis... A tennis ball is served 2.00 degrees above the horizontal at a height of 2.40 meters, 12.0 meters from a net that is 0.900 meters high. (a) If the tennis ball is to clear the net by at least 0.200 meters, what is its minimum initial velocity? (b) If the ...
*Monday, February 8, 2016 by tom*

**physics**

A ball is thrown vertically upward with an initial speed of 25 m/s. Then, 1.8 s later, a stone is thrown straight up (from the same initial height as the ball) with an initial speed of 32.1 m/s . How far above the release point will the ball and stone pass each other? The ...
*Monday, February 8, 2016 by Mariana*

**Physics**

Two students are on a balcony 22 m above the street. One student throws a ball vertically downward at 15.5 m/s; at the same instant, the other student throws a ball vertically up- ward at the same speed. The second ball just misses the balcony on the way down. How far apart ...
*Monday, February 8, 2016 by Mariana*

**physics**

A chair of mass 14.5 kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force F = 35.0 N that is directed at an angle of 43.0 ∘ below the horizontal and the chair slides along the floor. find the normal force of chair on floor
*Monday, February 8, 2016 by pop*

**Physics**

Boyle's Law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 2 L, the pressure is 1065 kPa (kilopascals). What is the pressure when the volume is 15 L?
*Monday, February 8, 2016 by Marie*

**physics**

Canadian snowbirds usually follow the I-15 at a speed of about 120 kilometers per hour. Canadian geese, on the other hand, migrate approximately along a north-south direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100 kilometers per ...
*Monday, February 8, 2016 by tom*

**physics**

A tennis ball is served 2.00 degrees above the horizontal at a height of 2.40 meters, 12.0 meters from a net that is 0.900 meters high. (a) If the tennis ball is to clear the net by at least 0.200 meters, what is its minimum initial velocity? (b) If the tennis ball clears the ...
*Monday, February 8, 2016 by tom*

**physics**

The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0 degrees above the horizontal, some of the tiny critters have reached a maximum height of 58.7 cm above the level ground. (See Nature, Vol. 424, 31 July 2003, p. 509...
*Monday, February 8, 2016 by tom*

**physics**

a car moving at 10ms - was uniformly accelerated for 5s until it velocity reaches 20ms -. it then maintain the speed for another 20s after which the brakes were applied as the vehicle was finally brought to rest in a further 10s.draw the velocity time graph of the motion
*Monday, February 8, 2016 by queenlatifah*

**physics**

An object with a mass of 2kg is moving at 8m.s-1 a net force acts on iy for 7s,after which it moves at 10m.s-1 in the opposite direction. The magnitude and direction of the net force is
*Monday, February 8, 2016 by lindokuhle mahlamvu*

**physics**

A rocket blasts off from rest and attains a speed of 49 m/s in 16 s. An astronaut has a mass of 56.3 kg. What is the astronaut's apparent weight during take off?
*Monday, February 8, 2016 by Bill*

**Physics**

A rocket of mass 4.5 105 kg is in flight. Its thrust is directed at an angle of 47.5° above the horizontal and has a magnitude of 6.60 106 N. Find the magnitude and direction of the rockets acceleration. Give the direction as an angle above the horizontal.
*Monday, February 8, 2016 by Kylie*

**physics**

a pitcher threw a baseball clocked at 105 miles per hour. The pitcher’s mound is 60 feet 6 inches from home plate. How long did it take, in seconds, for the ball to travel from the pitcher’s mound to home plate?
*Monday, February 8, 2016 by Lakisha*

**physics**

the speed of a bus increase uniform from 15mls 6mls in 20s calculate.a the average speed.b accelaration. c the distance travelled during the either period
*Monday, February 8, 2016 by shafiu*

**Physics**

A child bounces in a harness suspended from a door frame by three elastic bands. (a) If each elastic band stretches 0.210 m while supporting a 7.35-kg child, what is the force constant for each elastic band? 114.33 N/m (b) What is the time for one complete bounce of this child...
*Monday, February 8, 2016 by Jesse*

**Physics**

A penguin has a mass of 13 kg. The penguin slides over the ice for a distance of 50.7 m in 1.7 s before coming to a complete stop. The penguin uniformly accelerates during the entire time period. What is the net force exerted on the penguin?
*Monday, February 8, 2016 by CJ*

**Physics**

A bug rides on a turntable which is rotating at 3 rad/s. The moto is turned off, and the bug covers 36 radians before coming to rest. a. What is the angular acceleration of the bug? b. How long does it take the bug to stop?
*Monday, February 8, 2016 by John*

**Maths.physics.chemestry.english**

6x+1/2a -x-2/2a
*Monday, February 8, 2016 by Ibrahim*

**Physics**

A stone is thrown vertically upward at an initial speed of 10m/s. Find the total time of the flight and the maximum height reached by the stone.
*Monday, February 8, 2016 by Jane*

**Physics**

A tennis player throws a tennis ball vertically up with an initial velocity of 50m/s. Another player catches the ball after 0.43s. Find the time upward, time downward, and the vertical distance upward.
*Monday, February 8, 2016 by Jane*

**Physics**

A 4.40g bullet moving with an initial speed of vi = 405 m/s is fired into and passes through a 1.20 kg block. The block, initially at rest on a frictionless horizontal surface, is connected to a spring with a spring constant of 880 N/m. If the block moves x = 4.37 cm to the ...
*Sunday, February 7, 2016 by Anonymous*

**Physics**

A 69.6 kg fire fighter slides down a pole while a constant frictional force of 263 N retards his motion. A horizontal 18.7 kg platform is supported by a spring at the bottom of the pole to cushion the fall. The fire fighter starts from rest 5.80 m above the platform, and the ...
*Sunday, February 7, 2016 by Anonymous*

**Physics**

A rocket is fired at an angle from the top of a tower of height h0 = 68.6 m . Because of the design of the engines, its position coordinates are of the form x(t)=A+Bt2 and y(t)=C+Dt3, where A, B, C , and D are constants. Furthermore, the acceleration of the rocket 1.10 s after...
*Sunday, February 7, 2016 by Antonio*

**physics**

A ski jumper leaves a slope at an angle of 20.0 degrees above the horizontal direction. She lands 3.50 seconds later at a point 20.0 meters below her take-off point. (a) What was her initial speed? (b) How far does she travel horizontally?
*Sunday, February 7, 2016 by tom*

**Physics**

The mass of a minibus with the driver is 1.50×10^3 kg.Assume that the passengers have an average mass of 50.0kg each.The driver is moving at a speed of 30.0m.s^-1 when he notices that the traffic lights ahead have turned to red.He applies a force of 9000N on the brake ...
*Sunday, February 7, 2016 by Hasidiah*

**physics**

A motor car of mass 800kg travelling at 20m/s is brought to rest by brake in 100m.calculate the average braking force required.in physics
*Sunday, February 7, 2016 by emma*

**physics**

A stone is dropped from edge of a roof and is observed to pass a window, vertically below it. The stone takes 0.1 sec to fall between the top and bottom of the window. If the window is of 2 m height, how far is the roof above the top of the window?
*Sunday, February 7, 2016 by S kumar*

**physics**

i'm trying to calculate the tension in each rope.a body of mass 10 kilogram is kept in equilibrium by 2 ropes.1 rope pulls the body in a horizontal direction and the other in a direction 40 degrees to the vertical.
*Sunday, February 7, 2016 by modupe*

**Physics**

A glider with mass m=0.200kg sits on a frictionless horizontal air track, connected to a spring with force constant k=5.00N/m. The glider is released from rest with the spring stretched 0.100 m. What is the displacement x of the glider from its equilibrium position when its ...
*Sunday, February 7, 2016 by Anonymous*

**physics**

When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 916 N and the drag force has a magnitude of 1050 N. The mass of the sky ...
*Sunday, February 7, 2016 by John*

**physics**

A stone propelled from a catapult with a speed of 59meter per seconds attain a height of 100 meter calculate a. the time of flight b. the angle of the projection c. the range attain
*Sunday, February 7, 2016 by Eunice*

**physics**

A motor car of mass 800kg travelling at 20m/s is brought to rest by brake in 100m.calculate the average braking force required.in physics
*Sunday, February 7, 2016 by emma*

**physics**

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? (in m) could someone help me please!!!
*Sunday, February 7, 2016 by lisa*

**physics**

A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 16.0 m/s. The cliff is h = 25.0 m above a flat horizontal beach, as shown in the figure below. How long after being released does the stone strike the beach below the cliff? s...
*Sunday, February 7, 2016 by lisa*

**physics**

A bullet of mass 0.08kg is fired horizontally into a 10kg block which is free to move. If both bullet and block move with a velocity of 0.6m/s after the impact, find the velocity with which the bullet hits the body
*Sunday, February 7, 2016 by Sarah*

**physics**

I am 6 feet tall,weigh 69kg slipped and fell flat in 2 seconds,hitting iron bar on side of stairs.What is the force of impact on the soles at the time of impact at the end of 2 seconds? PS:this really happened that has destroyed my soles from the force of impact injury.
*Sunday, February 7, 2016 by arun*

**physics (mechanics)**

find the constant force necessary to accelerate a car of mass 1000kg from 15m/s to 20m/s in 10s against resistance of 270N ? pls show work (answer is 770N just in case to check) ive been asking this question 4 times still no one answer . someone pls do .
*Sunday, February 7, 2016 by sam*

**physics**

what are the dangers of radioactive isotopes?
*Sunday, February 7, 2016 by Nelly *

**Physics**

We study the three point charges shown in the figure. They are held at the corners of an equilateral triangle with ℓ = 0.9 m. What is the electric potential energy of the system of three point charges? Use for the three charges q1 = +2Q, q2 = −3Q, and q3 = +Q, ...
*Sunday, February 7, 2016 by Emily*

**physics**

For its size, the common flea is one of the most accomplished jumpers in the animal world. A 2.30 mm -long, 0.540 mg critter can reach a height of 18.0 cm in a single leap. a) Neglecting air drag, what is the takeoff speed of such a flea? -i got 1.88m/s b) Calculate the ...
*Sunday, February 7, 2016 by Anonymous*

**Physics**

A glider with mass m=0.200kg sits on a frictionless horizontal air track, connected to a spring with force constant k=5.00N/m. The glider is released from rest with the spring stretched 0.100 m. -What is the displacement x of the glider from its equilibrium position when its ...
*Sunday, February 7, 2016 by Anonymous*

**physics**

The vector position of a particle varies in time according to the expression r with arrow = 6.60 i − 9.00t2 j where r with arrow is in meters and t is in seconds. (a) Find an expression for the velocity of the particle as a function of time. (Use any variable or symbol ...
*Saturday, February 6, 2016 by Mohammed *

**physics**

A 3.6-kg cat is sitting on the edge a merry-go-round that is spinning at 2.7 rad/s. The diameter of the merry-go-round is 5.6 m. How large is the static friction between the cat’s paws and the surface of the merry-go-round if it does not slip off?
*Saturday, February 6, 2016 by Mary*

**Physics**

Two capacitor plates are equally and oppositely charged. They are separated by 1.30 cm. An electron is released from rest at the surface of the negative plate and, at the same time, a proton is released from rest at the surface of the positive plate. Where do the electron and ...
*Saturday, February 6, 2016 by Sam*

**Physics**

A ball is projected horizontally from the edge of a table that is 1.14 m high, and it strikes the floor at a point 1.40 m from the base of the table. It's initial velocity is 2.9 m/s. How high is the ball above the floor when its velocity vector makes a 43.6o angle with ...
*Saturday, February 6, 2016 by C*

**Physics 30**

calculate the netforrce on q2? calculate the net force on q3? q1=+3.0 MC q2=+3.0MC q3=-6.0MC q1-------20cm-------------q2 I I I 50 cm I I I q3
*Saturday, February 6, 2016 by elaine*

**Physics 30**

A. Calculate the net force on q2? b. calculate the net force on q3? q1= +2.0 MC q2=+3.0 MC q3=+6.0 MC q1-----30cm-----q2-----------45cm----------q3
*Saturday, February 6, 2016 by elaine*

**Physics 30**

The circuit has two resistors? V= 22V R= 27 Komega R=? I= 12mA
*Saturday, February 6, 2016 by elaine*

**Physics 30**

A circuit with a single 25.0 omega resistor runs for 5.00 s. During this time10.0 C pass through a point in the circuit. a. What is the power rating of this circuit? b. How much energy is used?
*Saturday, February 6, 2016 by elaine*

**Physics 30**

Two point charges objects produce an electric force on each other of 3.6x10^-2 N. What is the electric force between them if the distance is increased five times?
*Saturday, February 6, 2016 by elaine*

**PHYSICS**

how far apart are two point charges of 5.0x10^-6 C and 6.0x10^-6 C if they produce an electric force on each other of 0.62 N?
*Saturday, February 6, 2016 by elaine*

**physics & math**

If you jump off a 10 meter cliff on the Moon, and the acceleration of gravity is 1.6 m/s^2. How fast are you going when your feet hit the bottom of the cliff?
*Saturday, February 6, 2016 by Jules*

**physics**

If you jump off a 10 meter cliff on the Moon, and the acceleration of gravity is 1.6 m/s^2. How fast are you going when your feet hit the bottom of the cliff?
*Saturday, February 6, 2016 by Jules*

**Physics**

A body of mass m falls from rest through the air. A drag force D = bv^2 opposes the the motion of the body. The acceleration due to gravity is g. A) What is the initial downward acceleration of the body? B) After some time the speed of the body approaches a constant value. ...
*Saturday, February 6, 2016 by Lauren*

**Physics**

A block of mass m = 2.00 kg is released from rest h = 0.500 m from the surface of a table, at the top of a theta = 30.0° incline. The frictionless incline is fixed on a table of height H = 2.00 m. (a) Determine the acceleration of the block as it slides down the incline. (...
*Saturday, February 6, 2016 by Edge*

**Physics**

Tow force are acting 50 degree apart, one of 200g grams and one of 300 gram. Fine the resultant force, its magnitude and the direction it makes with the original tow vectors
*Saturday, February 6, 2016 by Roben *

**Physics**

Real world trampolines lose energy since they are damped springs with much internal friction. How much energy does the sumo wrestler lose on each bounce in this situation? Information I was given: mass=400 kg gravity=10N/kg k = 12000 N/m I also know from the previous question ...
*Saturday, February 6, 2016 by Charlotte*

**physics**

calculate numerical value of current in inductor resistant circuit. l=1mH r=3k (ist=1ma at t=0) i1(t=1us)in ma. i0=1ma my work. i=i0(1-e^-(t/T)) 1*10^-3(1-e^(-1/0.33) i=0.952ma this is wrong do I need to add initial current to this(1ma). why is this wrong??
*Saturday, February 6, 2016 by bearinthewoods*

**physics (mechanics)**

find the constant force necessary to accelerate a car of mass 1000kg from 15m/s to 20m/s in 10s against resistance of 270N ? pls show work (answer is 770N just in case to check)
*Saturday, February 6, 2016 by sam*

**physics**

A disc has a mass of 340kg, and is mounted to a frictionless axle and is free to rotate around it. Model the shape of the disc as a hollow shaft on axis where the inner and outer diameters are 600mm and 1200mm respectively. A wire is wrapped around the disk, and is the pulled ...
*Saturday, February 6, 2016 by Jeff*

**Physics**

A rubber ball of mass 0.12kg is held at a height of 2.5m above the ground, and then released.
*Saturday, February 6, 2016 by Onofiok*

**physics**

What's the solution of a body of weight 100N resting on a plane which is inclined at 30° to the horizontal with the components of the weight parallel and perpendicular to the plane?
*Saturday, February 6, 2016 by Rose khonje *

**physics**

a ball thrown by a boy is caught by another after 2 second soome distance away in the same level. If thr angle of projection is 30 degree, the velocity of projection will be?
*Saturday, February 6, 2016 by shikha*

**physics**

Two 4 meter lorry cars are moving along the same direction on a straight road with a constant speeds of 70 km/hr and 90km/hr. if a passenge falls asleep when the faster car is 20m behind the slower car but wakes up after it is 20m ahead of the slower car. find how long he slept?
*Saturday, February 6, 2016 by Israel*

**physics**

Two capacitor plates are equally and oppositely charged. They are separated by 6.30 cm. An electron is released from rest at the surface of the negative plate and, at the same time, a proton is released from rest at the surface of the positive plate. Where do the electron and ...
*Saturday, February 6, 2016 by niro*

**Physics**

A stone is dropped from the roof of a high building. A second stone is dropped 1.08s later. How far apart are the stone when the second one has reached a speed of 15.0?
*Saturday, February 6, 2016 by Kelli*

**physics**

Three point charges are located away from a dot. charge 1 is 3 cm north of the dot and is 2.1 nC. Charge 2 is 5 cm east of the dot and is -5nC. Charge 3 is -10nC and is located 45 degrees northeast and 5.831 cm away from the dot. What is the net electric field at the position ...
*Friday, February 5, 2016 by niro*

**physics**

There is a thin rod of length L. The top half of the rod has a charge +Q, and the bottom half of the rod has a charge -Q. Evaluate the electric field E at a distance r = 7.40 cm if L = 7.30 cm and Q = 3.50 nC
*Friday, February 5, 2016 by niro*

**physics**

Two capacitor plates are equally and oppositely charged. They are separated by 6.30 cm. An electron is released from rest at the surface of the negative plate and, at the same time, a proton is released from rest at the surface of the positive plate. Where do the electron and ...
*Friday, February 5, 2016 by niro*

**physics**

A charge of 16.0 nC is uniformly distributed along a thin, flexible rod of length 31.0 cm. The rod is then bent into a semicircle, evaluate the electric field strength from the centre
*Friday, February 5, 2016 by niro*

**physics**

Jessica stretches her arms out 0.6 m from the center of her body while holding a 2 kg mass in each hand. She then spins around on an ice rink at 1.1 m/s.
*Friday, February 5, 2016 by kylie*

**Physics**

Calculate the distance travelled by a car with a velocity of 30m/s and it increase its speed to 60 m/s in 2 hours.assume acceleration is constant.
*Friday, February 5, 2016 by Grace perez*

**Physics**

I drop an object from a height of 500.0 m. How long does it take to hit the ground?
*Friday, February 5, 2016 by JR*

**Physics**

A man uses a crowbar 1.5 meter long to lift a rock weighing 600 newton. If the fulcrum is 0.50 meter from the end of the bar touching the rock, how much effort must the man apply?
*Friday, February 5, 2016 by Chadero*

**Physics**

A uniform electric field with a magnitude of 6100 V m−1 points in the positive x direction. Find the change in electric potential energy when a +14 μC charge is moved 5 cm in the positive x direction. Answer in joules.
*Friday, February 5, 2016 by Peter*

**Physics**

How do you calculator the percent error from a graph?
*Friday, February 5, 2016 by Taylor*

**Physics**

What would the percent error of the experimental value of g be if the accepted value is 9.8 m/s^2? The slope equation is y=.5001430132x-.0109639087
*Friday, February 5, 2016 by Taylor*

**Physics**

What would the experimental value of g be if the slope of the graph represents 1/2 g and the equation is y=5.00x-.0109639087
*Friday, February 5, 2016 by Taylor*

**Physics**

A person rides a motorbike 145 m along a road that slants upward at 4.5 o from the horizontal. How much higher will the rider be at the end of the trip? How far has the rider gone in the horizontal direction?
*Friday, February 5, 2016 by Edwin*

**Physics**

Two speakers, one directly behind the other, are each generating a 264-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Take the speed of sound to be 342 m/s.
*Friday, February 5, 2016 by James*

**physics**

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building?
*Friday, February 5, 2016 by lisa*

**Physics**

A man goes 123km North and then 123km to south.what is his displacement?
*Friday, February 5, 2016 by Lechisa *

**Physics**

A child bounces in a harness suspended from a door frame by three elastic bands. (a) If each elastic band stretches 0.210 m while supporting a 7.35-kg child, what is the force constant for each elastic band? (b) What is the time for one complete bounce of this child? (c) What ...
*Friday, February 5, 2016 by Bust Nuttington*

**physics**

A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 7.50 m/s at an angle of 18.0° below the horizontal. It strikes the ground 5.00 s later. (a) How far horizontally from the base of the building does the ball strike the ...
*Friday, February 5, 2016 by kim*

**physics**

A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 22.0 m/s. The cliff is h = 38.0 m above a flat horizontal beach, as shown in the figure below. How long after being released does the stone strike the beach below the cliff? s...
*Friday, February 5, 2016 by lina*

**physics**

A figure skater glides along a circular path of radius 4.70 m. (a) If she coasts around one fourth of the circle, find the magnitude of the displacement vector. m (b) If she coasts around one fourth of the circle, find what distance she skated. m (c) What is the magnitude of ...
*Friday, February 5, 2016 by lina*