Sunday

February 7, 2016
**Physics**

A car accelerates from rest with a uniform acceleration of 1.7m/s for 10secs., its acceleration then reduces by 0.3m/s for 20secs. of the motion it then maintains the speed attained for another 20secs. after which it decelerates to rest within 10secs. hence calculate the ...
*Wednesday, November 11, 2015 by Rakelly*

**Physics**

An object is traveling at a constant speed of 12.0 m/s when it slows to a stop. If it takes 10.0 m for the object to stop, what is the magnitude of its acceleration?
*Wednesday, November 11, 2015 by Anonymous*

**physics**

If there were no air resistance, with what speed would drops hit the Earth if they fell from a cloud 3881 m above the Earth’s surface? The acceleration of gravity is 10 m/s
*Wednesday, November 11, 2015 by Anonymous*

**Physics**

A car accelerates from rest with a uniform acceleration of 1.7m/s for 10 seconds, its acceleration then reduces by 0.3m/s for 20 seconds of the motion, it then maintains the speed attained for another 20 seconds after which it decelerates to rest within 10 seconds. Draw the ...
*Wednesday, November 11, 2015 by Kelly*

**physics**

It continues to fly along the same horizontal arc but increases its speed at the rate of 1.41 m/s.Find the magnitude of acceleration under these new conditions. Answer in units of m/s
*Wednesday, November 11, 2015 by Maria *

**physics**

An object of mass 2kg is pulled to the right w/a force of 20N. The force makes an angle of 20o w/ the displacement axis. If the interface is rough w/a coefficient of kinetic friction 0.3, what's the net force along the diaplacement axis?
*Wednesday, November 11, 2015 by Sam*

**Physics**

At a playground, a 22kg child plays on a slide that drops through a height of 2.1m. The child starts at rest at the top of the slide. On the way down, the slide does a nonconservative work of -371J on the child. What is the child's speed at the bottom of the slide?
*Wednesday, November 11, 2015 by Amanda*

**physics**

An apple (0.100 kg) is thrown vertically upward at a speed of [let x = any whole number between 10 and 20] m/s (from an arm 1.5 m off of the ground). What is the maximum height that the apple reaches? (g=9.8 m/s2)
*Wednesday, November 11, 2015 by devon*

**College Physics**

A 10 kg mass (initially at rest) is attached to a rope, which is wrapped about a thin-walled hollow cyclinder of diameter D = 50 cm and mass = 20 kg. After the 10 kg mass drops a distance of 1.4 m, what is the angular speed of the cylinder? What is the acceleration of the ...
*Wednesday, November 11, 2015 by Steve*

**AP Physics**

What is the minimum work needed to push a 1025 kg car 290 m up a 17.5° incline with zero friction?
*Wednesday, November 11, 2015 by -*

**AP Physics**

A car does 8.0 ✕ 104 J of work in traveling 2.7 km at constant speed. What was the average retarding force (from all sources) acting on the car?
*Wednesday, November 11, 2015 by -*

**Physics**

A) A 600 kg steel beam is supported by the two ropes shown in (Figure 1). Calculate the tension in the rope. Express your answer to two significant figures and include the appropriate units. B) The rope can support a maximum tension of 3200 N . Is this rope strong enough to do...
*Wednesday, November 11, 2015 by PSS*

**Physics**

Randy throws a tennis ball horizonally to hit a wall 20 m away. If the ball hits the wall 1.5s after it is thrown, what is the horizontal component of the balls velocity?
*Wednesday, November 11, 2015 by Dylan*

**Physics**

Air consists of molecules of several types, with an average molar mass of 28.95g. About how many molecules does an adult who inhales 0.50L of air at sea level take in? The answer should be 1.3x10^22
*Wednesday, November 11, 2015 by John*

**physics**

The potential energy of a pair of hydrogen atoms separated by a large distance x is given by U(x)=-C(subscript)6/x^6, where C_6 is a positive constant. What is the force that one atom exerts on the other? Is this force attractive or repulse? I've taken the derivative of ...
*Wednesday, November 11, 2015 by justin*

**College Physics**

A 10 kg mass (initially at rest) is attached to a rope, which is wrapped about a thin-walled hollow cyclinder of diameter D = 50 cm and mass = 20 kg. After the 10 kg mass drops a distance of 1.4 m, what is the angular speed of the cylinder? What is the acceleration of the ...
*Tuesday, November 10, 2015 by Steve*

**Physics**

Answer
*Tuesday, November 10, 2015 by Setual *

**Physics**

A 0.78 kg rock is whirled around in a flat circle at the end of a string of length 64 cm and a radial acceleration of 3.70 m/s^2 (a) What is the linear velocity of string? (b) what is the centripetal force acting on the rock? Vm= sqrt( grFs ) = sqrt( 9.8 m/s)(47.5m) (0.740) ?
*Tuesday, November 10, 2015 by rayanne*

**Physics**

Catching a wave, a 77-kg surfer starts with a speed of 1.2 m/s , drops through a height of 1.60 m , and ends with a speed of 8.5 m/s . How much nonconservative work was done on the surfer?
*Tuesday, November 10, 2015 by Ashlee*

**Physics**

Catching a wave, a 77-kg surfer starts with a speed of 1.2 m/s, drops through a height of 1.60 m, and ends with a speed of 8.5 m/s. How much nonconservative work was done on the surfer?
*Tuesday, November 10, 2015 by Amanda*

**Physics**

Two cars collide as shown in the figure. The yellow car is initially heading east and has a mass of 1000 kg. The red truck is initially heading north and has a mass of 2000 kg. The two vehicles collide, stick together, and veer off at a velocity of 16 m/s at a direction of 24 ...
*Tuesday, November 10, 2015 by David*

**Physics**

Two asteroids of equal mass collide as shown in the figure. After the collision, asteroid A’s trajectory is deflected by 30 degrees from its initial motion. Asteroid B is initially at rest and its final velocity makes a 45 degree angle with respect to the initial ...
*Tuesday, November 10, 2015 by GG*

**Physics**

A golf ball has a mass of 0.05 kg. It is initially at rest, but after being struck by a golf club it is given a speed of 30 m/s. The club and the ball are in contact for 2 ms (.002 seconds). a) What is the average force acting on the ball? b) What is the impulse of the net ...
*Tuesday, November 10, 2015 by Alvin*

**physics**

A puck (mass m1 = 2.20 kg) slides on a frictionless table as shown in the figure below. The puck is tied to a string that runs through a hole in the table and is attached to a mass m2 = 6.6 kg. The mass m2 is initially at a height of h = 6.6 m above the floor with the puck ...
*Tuesday, November 10, 2015 by John*

**physics**

A child of mass 52 kg jumps onto the edge of a merry-go-round of mass 170 kg and radius 1.9 m that is initially at rest as sketched in the figure below. While in the air (during her jump), the child's linear velocity in the direction tangent to the edge of the merry-go-...
*Tuesday, November 10, 2015 by John*

**math, physics**

A motorboat goes upstream on a river and covers the distance between two towns on the riverbank in 6 hours. It covers this distance downstream in 5 hours. If the speed of the stream is 1.5 km/h, find the speed of the boat in still water. [This problem is challenging.
*Tuesday, November 10, 2015 by sophie*

**physics**

Goku wants to visit Andromaeda galaxy which is 2 million light years away from earth. If it takes 30 years in the frame of the spaceship to travel to Andromeda from earth, what should be the speed of the spaceship? Assume that the spaceship travels at constant speed
*Tuesday, November 10, 2015 by Kitty*

**physics**

A fly of mass .2 g sits 12 cm from the center of a phonograph record revolving 331.3 rpm. a)What is the magnitude of the centripetal force on the fly?b)What is the minimum value of the coefficient of static friction between the fly and the record required to prevent the fly ...
*Monday, November 9, 2015 by Jenna*

**Physics**

A car starts from rest with an acceleration of 1.87 m/s^2 at the same time that a second car moving with a velocity of 29.2 m/s passes it. How far does the first car move before it overtakes the second car?
*Monday, November 9, 2015 by Frank William*

**Physics**

A girl with a 72.8 g yo-yo is swinging it in a horizontal circle at an angular velocity of 7.99 rad/s. If the string is tilted down at an angle of 17.1°, what must the length of the yo-yo string be? so i tried doing r = (0.0728)(7.99)^2/(9.8sin17.1 + 9.8cos17.1) i got 0....
*Monday, November 9, 2015 by UOIT*

**physics**

An electrostatic paint sprayer has a 0.200-m-diameter metal sphere at a potential of 25.0 kV that repels paint droplets onto a grounded object. What charge must a 0.100-mg drop of paint have to arrive at the object with a speed of 10.0 m/s?
*Monday, November 9, 2015 by carolyn*

**physics**

The drawing shows a skateboarder moving at 6.88 m/s along a horizontal section of a track that is slanted upward by 37.3 ° above the horizontal at its end, which is 0.741 m above the ground. When she leaves the track, she follows the characteristic path of projectile ...
*Monday, November 9, 2015 by John*

**Physics**

An 91.0 kg in-line skater does 3620 J of nonconservative work by pushing against the ground with his skates. In addition, friction does -615 J of nonconservative work on the skater. The skater's initial and final speeds are 2.70 m/s and 1.02 m/s, respectively. Part B ...
*Monday, November 9, 2015 by Amanda*

**Physics**

A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff, the rock has a speed of 32 m/s . Part A Assuming that air resistance can be ignored, find the initial speed of the rock. Part B Find the ...
*Monday, November 9, 2015 by Amanda*

**Math**

Which of the following situations corresponds to the equation below? 1/3x + 8 = 18 2/3 Keneda is packing some suitcases to take on a cruise. The cruise line allows each guest to bring up to three pieces of luggage with a limit on total weight. So far, she has packed pounds ...
*Monday, November 9, 2015 by Wendy*

**Quick Physics Check**

2. Which of the following examples does not show projectile motion? A. a tennis ball bounces across the net B. a ball is thrown at a downward angle toward a target on the ground C. a feather drifts to the ground D. a horseshoe is pitched at a stake Is it C? 3. Which of the ...
*Monday, November 9, 2015 by Anonymous*

**Physics**

A 55-kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 41.0 ∘ above the horizontal. If the tension in the rope is 195 N , how much work is done on the crate by the rope to move it 3.0 mm ?
*Monday, November 9, 2015 by Amanda*

**physics**

Why do light(photons) have no mass
*Monday, November 9, 2015 by stephan*

**Physics**

You are installing a new spark plug in your car, and the manual specifies that it be tightened to a torque that has a magnitude of 45.8 N*m. Using the data in the figure below (L = 0.287 m and θ = 49.6°), determine the magnitude F of the force that you must exert on ...
*Monday, November 9, 2015 by Julia*

**physics**

A(n) 2153 kg car is coasting along a level road at 34.4 m/s. A constant braking force is applied, such that the car is stopped in a distance of 61.8 m. What is the magnitude of the braking force? Answer in units of N
*Monday, November 9, 2015 by colton*

**Physics**

The school bus slows from 60km/h to 40km/h when entering the scholl zone. a. Calculate the conversation of these speeds from km/h to m/s. b. Given that this change of speed occured over 8 seconds, calculate the average deceleration of the bus. My work... a.60/3.6=17m/s 40/3.6=...
*Monday, November 9, 2015 by Ronnie*

**Physics**

a uniform pole 20ft long ang weighing 50lbs is used to carry a load of 180lbs.Two men,one supporting twice as much as the other support the pole to keep it in a horizontal position.How far from the center of the pole should the load be hung.?
*Monday, November 9, 2015 by zyrinxlee*

**Physics**

An experimental model rocket has a mass of 0.054kg. The fuel that was used in one test had 215J of chemical potential energy. When the rocket reached an altitude of 119m, it was travelling at 48m/s and still rising. With what efficiency did the rocket convert chemical ...
*Monday, November 9, 2015 by Annie*

**AP Physics**

A large box has a mass of 500kg and the coefficient of static friction for the box and the floor is 0.45, and the coefficient of kinetic friction is 0.30. a. What is the minimum horizontal force needed to get the box moving? b. If you continue to push with that force, what ...
*Sunday, November 8, 2015 by Anna*

**AP Physics**

A mystery surprise box is sliding down a ramp at a constant speed. The box has a mass of 55.0kg and the ramp makes a 40.0œ angle with the horizontal. What is the coefficient of kinetic friction between the box and the ramp? Please help asap. Thank you.
*Sunday, November 8, 2015 by Anna*

**Simple algebra/Physics problem**

A proton, moving with a velocity of vi, collides elastically with another proton that is initially at rest. Assuming that after the collision the speed of the initially moving proton is 2.90 times the speed of the proton initially at rest, find the following. (a) the speed of ...
*Sunday, November 8, 2015 by PersonWhoNeedsHelp*

**Physics**

A stone weighs 34.0 N. What force must be applied to make it accelerate upward at 4.00 m/s2?
*Sunday, November 8, 2015 by Anonymous*

**physics**

A 40 N force is applied at an angle of 30o to the horizontal to pull a 6 kg box along the floor. If the coefficient of friction between the box and floor is 0.3.The box initially at rest moves a horizontal distance of 5m. What is the speed of the box when it reaches 5m? No ...
*Sunday, November 8, 2015 by Prince*

**physics**

Three people attempt to hold a heavy sign in place. Abby pulls directly upwards (in the middle) with 140 N of force. Joe is ob Abby's left and pulls at a 30.0° to Abby's rope with a force of 180 N. Henry is on Abby's right and pulls at a 30.0° to Abby's...
*Sunday, November 8, 2015 by Heather*

**Physics**

A stone weighs 34.0 N. What force must be applied to make it accelerate upward at 4.00 m/s2?
*Sunday, November 8, 2015 by Anonymous*

**physics**

A force is applied to a 2.9 kg mass and produces 2.7 m/s 2 acceleration. What acceleration would be produced by the same force applied to a 6.2 kg mass? Answer in units of m/s 2 .
*Sunday, November 8, 2015 by chris*

**Physics**

Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 36.0 km/s and 50.6 km/s. The slower planet's orbital period is 7.78 years. (a) What is the mass of the star? (b) What ...
*Sunday, November 8, 2015 by Hannah*

**Physics**

A "swing" ride at a carnival consists of chairs that are swung in a circle by 11.5 m cables attached to a vertical rotating pole, as the drawing shows. Suppose the total mass of a chair and its occupant is 204 kg. (a) Determine the tension in the cable attached to ...
*Sunday, November 8, 2015 by Hannah*

**Physics "Simple" Energy Problem**

Jonathan is riding a bicycle and encounters a hill of height 6.70 m. At the base of the hill, he is traveling at 5.00 m/s. When he reaches the top of the hill, he is traveling at 3.00 m/s. Jonathan and his bicycle together have a mass of 77.6 kg. Ignore friction in the bicycle...
*Sunday, November 8, 2015 by PersonWhoNeedsHelp*

**physics **

An airplane travels 3900 km at 810 km/h, and then encounters a tailwind that boosts its speed to 950 km/h for the next 3000 km. What was the average speed of the plane for this trip? 3900+3000 6900 6900/8 862.5
*Sunday, November 8, 2015 by jesse*

**Physics**

A proton, moving with a velocity of vi, collides elastically with another proton that is initially at rest. Assuming that after the collision the speed of the initially moving proton is 2.90 times the speed of the proton initially at rest, find the following. (a) the speed of ...
*Sunday, November 8, 2015 by PersonWhoNeedsHelp*

**physics**

Alice has a mass of 70.0 kg and her car has a mass of 1000.0 kg. Alice is sitting in parked car on the side of the road. The magnitude of the normal force exerted by the road on her car is? (use g = 9.81 m/s2)
*Sunday, November 8, 2015 by Sami*

**Physics**

A marble and a cube are placed at the top of a ramp. Starting from rest at the same height, the marble rolls without slipping and the cube slides (no kinetic friction) down the ramp. Determine the ratio of the center-of-mass speed of the cube to the center-of-mass speed of the...
*Sunday, November 8, 2015 by Rob*

**Physics**

Two buckets of sand hang from opposite ends of a rope that passes over an ideal pulley. One bucket is full and weighs 110 N ; the other bucket is only partly filled and weighs 65 N . You release the lighter bucket and the heavier one descends. What is the tension in the rope?
*Sunday, November 8, 2015 by Luke*

**physics**

The bird perched on the swing shown below has a mass of 41.6 g, and the base of the swing, y = 7.88 cm below the hook, has a mass of 147 g. The swing and bird are originally at rest, and then the bird takes off horizontally at 1.94 m/s. How high will the base of the swing rise...
*Sunday, November 8, 2015 by Jackson*

**physics**

A spring and mass system are oscillating with an amplitude of 5.4 cm. The spring constant is 166 N/m and the mass is 540 g. Find the mechanical energy of the system
*Sunday, November 8, 2015 by diana*

**physics**

a body travels from rest with acceleration 8ms find its velocity when it has covered a distance of 100m
*Sunday, November 8, 2015 by ezekel ayuba*

**physics**

an object of mass 10kg moves in a circle of radius 13m of uniform speed of 43m\s a) calculate the angular velocity b) the centripetal force
*Sunday, November 8, 2015 by cynthia*

**physics**

Lunar astronauts placed a reflector on the Moon’s surface, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round trip time. The taken for the laser pulse to travel there and back again can be measured to 0.1 ns. What ...
*Sunday, November 8, 2015 by carolyn*

**physics**

A heart defibrillator passes 10.0 A through a patient’s torso for 5.00 ms in an attempt to restore normal beating. Find the temperature increase caused in the 8.00 kg of affected tissue if all the energy heats up the tissue with a specific heat capacity of 3000 J kg-1 K-1.
*Sunday, November 8, 2015 by carolyn*

**physics**

Alkaline batteries have the advantage of putting out constant voltage until very nearly the end of their life. How long will an alkaline battery rated at 1 A ⋅ h and 1.58 V keep a 1 W flashlight bulb burning?
*Sunday, November 8, 2015 by carolyn*

**physics**

two force vectors, f1 18N at 60 degree above the positive axis and F2 6.5N at 45 degree below the positive axis, are applied to a particle at the origin. what third force f3 would make the net force on the particle equal to zero
*Sunday, November 8, 2015 by Anonymous*

**Physics**

A ball is dropped from a building, after 2 sec another ball is thrown downward. After 6 sec the second ball overtook the first ball. Is the second ball has greater acceleration than the first ball? Explain.
*Sunday, November 8, 2015 by Mike*

**ap physics**

The acceleration due to gravity on the moon has a magnitude of 1.62 m/s. deal with a placekicker kicking a football. Assume that the ball is kicked on the moon instead of on the earth. Find (a) the maximum height H and (b) the range that the ball would attain on the moon.
*Sunday, November 8, 2015 by Anonymous*

**physics**

An object has an initial velocity of 2.25 m/s at 57.2 degrees. An acceleration of 133.4 m/s/s at 59.5 degrees is applied. What was the final speed after the object has a displacement of 8.8 m at 33.5 degrees?
*Saturday, November 7, 2015 by EB*

**physics**

An object has an initial velocity of 3.87 m/s at 40.3 degrees. 8.35 seconds later it is moving at 41.1 m/s at an angle of 26.5 degrees. What acceleration caused this change in velocity? (Give your answer in terms of the +x-axis, in degrees)
*Saturday, November 7, 2015 by EB*

**physics**

After a constant acceleration of 2.2 m/s/s at 16 degrees above the +x-axis is applied by the motors of a boat for 8 seconds, the boat is moving at 61.45 m/s at 43.5 degrees above the +x-axis. What was the displacement of the boat during this time? (Give your answer in terms of...
*Saturday, November 7, 2015 by EB*

**physics**

After a constant acceleration of 2.1 m/s/s at 31.7 degrees above the +x-axis is applied by the motors of a boat for 7.75 seconds, the boat is moving at 59.1 m/s at 43 degrees above the +x-axis. What was the initial velocity of the boat? (Give your answer in terms of a positive...
*Saturday, November 7, 2015 by EB*

**physics**

In a shipping company distribution center, an open cart of mass 55.0 kg is rolling to the left at a speed of 5.30 m/s (see the figure (Figure 1) ). You can ignore friction between the cart and the floor. A 18.0 kg package slides down a chute that is inclined at 37 ∘ from...
*Saturday, November 7, 2015 by malakai*

**physics**

Alkaline batteries have the advantage of putting out constant voltage until very nearly the end of their life. How long will an alkaline battery rated at 1 A ⋅ h and 1.58 V keep a 1 W flashlight bulb burning?
*Saturday, November 7, 2015 by carolyn*

**Physics**

Lunar astronauts placed a reflector on the Moon’s surface, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round trip time. The taken for the laser pulse to travel there and back again can be measured to 0.1 ns. What ...
*Saturday, November 7, 2015 by carolyn*

**physics**

A heart defibrillator passes 10.0 A through a patient’s torso for 5.00 ms in an attempt to restore normal beating. Find the temperature increase caused in the 8.00 kg of affected tissue if all the energy heats up the tissue with a specific heat capacity of 3000 J kg-1 K-1.
*Saturday, November 7, 2015 by carolyn*

**Physics**

The propeller blades of an airplane are 2.4 m long. The plane is getting ready for takeoff, and the propeller starts turning from rest at a constant angular acceleration. The propeller blades go through two revolutions between the fifth and the seventh second of the rotation. ...
*Saturday, November 7, 2015 by John*

**general physics question**

Whenever I read my science textbooks, they always say that "electrons were fired" or "stream of electrons were fired to the target" during an experiment my question is, how to they generate a stream of electrons to fire in a line?? sorry if this is a dumb ...
*Saturday, November 7, 2015 by Anonymous*

**physics**

A 22 kg child is riding a playground merry-go-round that makes 40 revolutions in 60 seconds. Determine the magnitude of force (in Newtons) necessary to make the child stay on the merry-go-round if she is 1.25m from its center.
*Saturday, November 7, 2015 by edson*

**physics**

the speed of train is reduced from 60km/h at the same time as it travel a distance of 450m if retardation is uniform find how much further it will travel approx befor coming rest?
*Saturday, November 7, 2015 by tarique*

**physics**

Two workers are sliding 330 kg crate across the floor. One worker pushes forward on the crate with a force of 410 N while the other pulls in the same direction with a force of 240 N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a ...
*Friday, November 6, 2015 by yahya*

**Physics **

Which of the following summarizes Rutherford's model of the atom? a. Electrons are embedded in a positive region of spherical dimension. b. Electrons revolve around the nucleus without emitting radiation. c. Electrons revolve around the nucleus like planets move around the...
*Friday, November 6, 2015 by Sam*

**Physics**

A ship fires its guns with a speed of 400 m/s at an angle of 35 with the horizontal. a. Find the range and maximum altitude. b. If the ship hits a plane that was 12 km away, how high was the plane flying?
*Friday, November 6, 2015 by Anonymous*

**Physics**

A person kicks a rock off a cliff horizontally with a speed of 20.0 m/s. It takes 7.0 seconds to hit the ground, find: a. height of the cliff b. final vertical velocity c. horizontal range
*Friday, November 6, 2015 by Anonymous*

**physics**

A hungry bear weighs 700 N walks to a basket of candy that is located in end of a beam . The beam is uniform and weighs 200N , with a length of 6.0 m . The beam is supported by a cord forming an angle of 60 ° . The basket weighs 80 N. When the bear is within 1.2 m ...
*Friday, November 6, 2015 by ???*

**Physics **

How much time does it take for a car to come to rest if it has an initial speed of 22m/s and slows with a deceleration of 6.1 m/s^2 Will my answer be 3.6 m/s^2
*Friday, November 6, 2015 by anonymous *

**Physics**

A 1-m-tall barrel is closed on top except for a thin pipe extending 6.0 m up from the top. When the barrel is filled with water up to the base of the pipe (1 m deep) the water pressure on the bottom of the barrel is 10 kPa. What is the pressure on the bottom when water is ...
*Friday, November 6, 2015 by Cynthia*

**Physics**

Mr.Notten throws an egg from the top of a school at an initial velocity of 20m/straight upward. The egg is launched 50 m above the ground, and the egg just misses the edge of the roof on its way down? what is maximum height? what is the maximum height of the egg? Determine the...
*Friday, November 6, 2015 by Anonymous*

**Physics**

A ball is thrown from the top of a building with an initial velocity of 30m/s straight upward, at an initial height of 50m above the ground. The ball just misses the edge of the roof on is way down and hits the ground. Determine: a) time needed for ball to reach max height. B)...
*Friday, November 6, 2015 by Anonymous*

**Physics**

Lily throws a ball at an angle of 53.13 degrees above the horizontal from a building that is 10m high. The ball has a speed of 12m/s, .6 seconds after she throws it. What was the initial speed of the ball? This is a vector problem and uses variables such as vx, vy, vyi, delta ...
*Friday, November 6, 2015 by Hasan*

**AP Physics**

A car traveling in a straight line has a velocity of 3.24 m/s at some instant. After 3.28 s, its velocity is 8.18 m/s. What is its average acceleration in this time interval? Answer in units of m/s 2 .
*Friday, November 6, 2015 by JB*

**Physics**

A golf ball has a mass of 0.05 kg. It is initially at rest, but after being struck by a golf club it is given a speed of 30 m/s. The club and the ball are in contact for 2 ms (.002 seconds).
*Friday, November 6, 2015 by Bob*

**Physics**

Miss E. deWater, the former platform diver of the Ringling Brothers' Circus, dives from a 80.0-meter high platform into a shallow bucket of water (see diagram at right). Determine her speed and her height after each second of fall. When t = 0 s: speed = 0 m/s and height = ...
*Friday, November 6, 2015 by Ryan*

**Physics**

Miss E. deWater, the former platform diver of the Ringling Brothers' Circus, dives from a 80.0-meter high platform into a shallow bucket of water (see diagram at right). Determine her speed and her height after each second of fall. When t = 0 s: speed = 0 m/s and height = ...
*Friday, November 6, 2015 by Ryan*

**physics**

A hungry bear weighs 700 N walks to a basket of candy that is located in end of a beam . The beam is uniform and weighs 200N , with a length of 6.0 m . The beam is supported by a cord forming an angle of 60 ° . The basket weighs 80 N. When the bear is within 1.2 m ...
*Thursday, November 5, 2015 by Sylar*

**physics **

A parallel beam of light enters a clear plastic bead 2.50cm in diameter and refractive index 1.44 .the point beyond the bead are these rays brought to focus is Plz answer this question
*Thursday, November 5, 2015 by saisree*

**physics **

A hollow cylinder, a solid cylinder, a hollow sphere, and a solid sphere roll down a ramp without slipping, starting from rest. The ramp is 0.25 m high. All the objects have radius 0.035. What are their final speeds? Please show what equation you used and what you plugged in...
*Thursday, November 5, 2015 by Caroline*

**Physics **

How much time does it take for a car to come to rest if it has an initial speed of 22m/s and slows with a deceleration of 6.1 m/s^2 Will my answer be 3.6 m/s^2
*Thursday, November 5, 2015 by anonymous *

**physics**

Any ideas? A bird flying at 3m/'s west is given an acceleration of 1ms after five seconds what I'd it's velocity and how far has it travelled from its starting point?
*Thursday, November 5, 2015 by Jack *