Wednesday

May 25, 2016
Number of results: 35,333

**Phyiscs**

Suppose you throw a stone straight up with an initial velocity of 27.0 m/s and, 5.5 s later you throw a second stone straight up with the same initial velocity. The first stone going down will meet the second stone going up. At what height above the point of release do the two...
*December 5, 2012 by HENRY!*

**probability**

A golf ball is selected at random from a golf bag. If the bag contains 2 orange balls, 5 red balls, and 18 brown balls, find the probability of the event. That the golf ball will be orange or red.
*June 17, 2014 by carol*

**sale price**

How do you find sale price? ex. A soccer uniform that normally sells for $45 is on sale for 30% off. Find the sale price.
*May 24, 2009 by Lexi*

**Physics**

A stone is thrown up vertically from the ground (the gravitational acceleration is g = 10 m/s^2 ). After a time dt =1 s, a second stone is thrown up vertically. The first stone has an initial speed v1 = 11.0 m/s, and the second stone v2 = 16.0 m/s. (a) At what time after the ...
*October 6, 2013 by Anonymous*

**PHYSICS!!!HELP！！**

An aircraft carrier has a speed of 13.0m/s relative to the water. A jet is catapulted from the deck and has a speed of 67.0m/s relative to the water. The engines produce a 1550-Hz whine, and the speed of sound is 343m/s. What is the frequency of the sound heard by the crew on ...
*March 22, 2008 by Stephy*

**Language Arts**

Draw a circle around the action verb in each sentence. On the line, tell whether the verb is past tense, present tense, or future tense. 1. Daniel will choose a baseball bat. -Circle will choose and it is present 2. He steps up to the plate.-Circle steps up and this is present...
*November 10, 2015 by Patrick*

**algebra**

the speed of a passenger train is 20mph faster than the speed of a freight train. the passenger train travels 300 miles in the same time it takes the freight train to travel 200miles find the speed of each train.
*December 13, 2011 by karon*

**math**

Suppose a boat has to make a round trip up and down a river. The trip up takes 1 hour and is with the current. The trip back takes 9 hours. Suppose the round trip is a total of 32 miles, and that the boat's speed and the speed of the current are constant. What is the boat's ...
*January 27, 2016 by Brent*

**differential equation urgent !**

Driver A had been leading archrival B for a while by a steady 3 miles. Only 2 miles from the finish, driver A ran out of gas and decelerated thereafter at a propertional to the square of his remaining speed. One mile later, driver A's speed was exactly halved.If driver B's ...
*February 26, 2013 by deq*

**Physics. PLEASE HELP!!**

A 1.3 kg steel ball and 8 m cord of negligi-ble mass make up a simple pendulum that can pivot without friction about the point O. This pendulum is released from rest in a horizontal position and when the ball is at its lowest point it strikes a 1.3 kg block sitting at rest on ...
*April 7, 2012 by Amber*

**Algebra**

A boat travels with the current at a speed of 10 miles per hour with respect to land, then against the same current at a speed of 6 miles per hour with respect to land. Find (a) the speed of the current, and (b) the speed of the boat in still water.
*January 21, 2009 by Amy*

**physics**

On a long journey if 10% of the distance is covered at an average speed of 40 km/h and 90% of the distance is covered at an average speed of 90 km/h. What is the average speed for the entire journey? How does this answer change if the percentages relate to time rather than ...
*April 11, 2012 by tanmay bhoite*

**simple physics problem**

A crate sliding down a ramp reaches the bottom of the ramp and slides across a flat floor. At the instant shown, the crate has a speed of v= 8.90 m/s. The crate comes to a stop after a distance x= 13.0m . What is the coefficient of kinetic friction between the crate and the ...
*August 29, 2010 by Anonymous*

**algebra**

I am confused about this one. It is about football. "In a football game the ball was advanced 5 yards from the Juniors' 25-yard line towards the Seniors' goal, then 6 yards then 8 yards back, 13 yards forward, 5 yards back, and then 11 yards forward. What was the position of ...
*June 15, 2010 by Amal*

**Pre-calculus**

Complete the table assuming continuously compounded interest. (Round your answers to two decimal places.) Initial Investment: Annual % Rate: Time to Double: 8 yr Amount After 10 Years: $1700 I don't understand how to get in the initial investment of annual % rate given only ...
*October 11, 2015 by Sarah*

**science**

A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
*December 17, 2012 by sam*

**Physics**

A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
*May 13, 2012 by Leah*

**Trig**

A soccer goal is 24 feet wide. Point A is 40 feet in front of the center of the goal. Point B is 40 feet in front of the right goal post. Which angle is larger A or B? How much larger?
*August 28, 2011 by Brett*

**physics**

One particle has a mass of 3.00*10-3 kg and a charge of +7.60 µC. A second particle has a mass of 6.00*10-3 kg and the same charge. The two particles are initially held in place and then released. The particles fly apart, and when the separation between them is 0.100 m, ...
*February 3, 2007 by Ann*

**Physics**

I need help solving the problem below. Please respond. At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 8.9 m above the water. One diver runs off the edge of the cliff, tucks into a "ball," and rotates on the way down with an average ...
*March 14, 2007 by Jim*

**physics**

A glider of mass m1 = 10.0 kg initially moving towards the right at a speed of v1i = 2.00 m/s on a frictionless airtrack collides with a spring attached to a second glider of mass m2 = 4.0 kg initially moving toward the left with a speed of v2i = 5.00 m/s. The spring constant ...
*November 26, 2006 by nicole*

**PreCal**

Projectile Motion: An object is propelled upward at an angle theta, 45 degree < theta <90 degree, to the horizontal with an initial velocity of v0 feet per second from the base of an inclined plane that makes an angle of 45 degree with the horizontal. If air is ignored, ...
*January 18, 2012 by sammy*

**AP CHEM**

For the reaction A + 2B + C ----> 2 D + E the following initial concentration and initial reaction rates are found: [A]null (M) [B]null (M) [C]null (M) 0.150 0.150 0.150 0.275 0.150 0.150 0.275 0.564 0.150 0.150 0.314 0.253 0.193 0.314 0.217 initial rate wrt E (Ms^-1) 0.210...
*February 25, 2008 by Gabe*

**physics**

A 92kg astronaut and a 1.2E3kg satellite are at rest relative to the space shuttle. The astronaut pushes on the satellite, giving a speed of 0.14m/s directly away from the shuttle. Seven and a half seconds later the astronaut comes into contact with the shuttle. What was the ...
*April 17, 2007 by Natash*

**PHYSICS**

A pendulum was set up and measurements were made to enable the mechanical energy to be calculated at the start position S and the lowest point of the pendulums swing L. The mass of the pendulum bob was determined on an electronic scale and its diamter was measured using ...
*January 30, 2010 by Sarah*

**Physics**

A projectile is shot from the edge of a cliff h = 225 m above ground level with an initial speed of v0 = 155 m/s at an angle of 37.0° with the horizontal a. Determine the time taken by the projectile to hit point P at ground level. b. Determine the range X of the projectile as...
*September 17, 2011 by Bridge*

**Physics**

From the edge of the rooftop of a building, a boy throws a stone at an angle 24.0° above the horizontal. The stone hits the ground 4.40 s later, 104 m away from the base of the building. (Ignore air resistance.) Find the initial velocity of the stone and magnitude and ...
*February 11, 2010 by Max*

**precalc**

1. A plane is headed at 122 degrees with an air speed of 350mph in a wind that is blowing from 38 degrees. Find the ground speed of the plane and the speed of the wind if the actual flight was at 133 degrees. 2. A plane is heading at 20 degrees at 300mph If a wind is blowing ...
*April 14, 2013 by sarah*

**physics **

Plot a speed-time graph of a car A traveling at a uniform speed of 80km/hr on the same graph plot the speed-time graph of 2nd car B starting from rest and uniformly accelarating through a maximum speed of 80km/hr a) what relations do you find between the distance covered by ...
*August 17, 2014 by Anonymous*

**Calculus Antiderivative Problem**

An object moves along a coordinate line with acceleration a(t)=(t+2)^3 units per second per second. a). The initial velocity is 9 units per second. The velocity function is v(t) = b).The initial position is 2 units to the right of the origin. The position function is x(t) =
*November 8, 2013 by Claire*

**CHEMISTRY PLEASE HELP**

For the reaction A + 2B + C ----> 2 D + E the following initial concentration and initial reaction rates are found: [A]null (M) [B]null (M) [C]null (M) 0.150 0.150 0.150 0.275 0.150 0.150 0.275 0.564 0.150 0.150 0.314 0.253 0.193 0.314 0.217 initial rate wrt E (Ms^-1) 0.210...
*February 25, 2008 by Gabe*

**physics**

A boat crosses a river of width 120 m in which the current has a uniform speed of 2.04 m/s. The pilot maintains a bearing (i.e., the direc- tion in which the boat points) perpendicular to the river and a throttle setting to give a constant speed of 2.58 m/s relative to the wa...
*September 15, 2013 by Anonymous*

**Math**

Pairs of markings a set distance apart are made on highways so that police can detect drivers exceeding the speed limit. Over a fixed distance, the speed R varies inversely with the time T. For one particular pair of markings, R is 60 mph when T is 8 seconds. Find the speed ...
*August 7, 2015 by Makaila*

**Physics**

A 10 m platform diver during his diving can increase his rotation rate from an initial rate of 0.8 rev/s to a maximum of 3.3 rev/s. If his initial moment of inertia was 10 kg·m2, what is his moment of inertia at his maximum rotation rate?
*April 26, 2013 by Derrick*

**physics**

A roller coaster of mass 1000.0 kg passes point A with a speed of 1.80 m/s? point a= 30m point b= 0m point c= 25m point d= 12m 1. What is the total mechanical energy of the roller coaster at point A? 2. What is the speed of the roller coaster at point B? 3. What is the ...
*April 24, 2011 by aly*

**Alegebra**

If a kayaker's speed while traveling upstream is 7 miles per hour and downstream is 4 miles per hour. What is the kayaker's speed in still water? What is the speed of the current?
*February 6, 2013 by Nick*

**Math**

During a soccer game, Erin scorded 1 out of 2 goals attempted. Lauren scored 6 out of 8 goals attempted. write the fraction that represents each and compare who was the most successful I think it was lauren because Erin only hit half and Laurn hit more than half
*October 12, 2015 by AABBCC*

**math**

The speed of a boat in still water is 8 km/h. It travels 60 km upstream and 60 km downstream in a total time of 16 hours. What is the speed of the stream?
*March 23, 2010 by Tonto*

**Science**

Is the following sentence true or false? Acceleration refers to increasing speed decreasing speed or changing direction
*January 12, 2011 by Payge*

**physics**

A car is speeding up and has an instantaneous speed of 14.0 m/s when a stopwatch reads 9.0 s. It has a constant acceleration of 2.3 m/s2. (a) What change in speed occurs between t = 9.0 s and t = 12.2 s?
*September 6, 2011 by abbie*

**Math**

An alien rocketship is travleing at a speed of 0.024 miles per minute. At this speed, how many inches will it travel in 1 second
*January 26, 2012 by Cassidy*

**science**

you are sledding on a snow-covered hill at a speed of 6 m/s there is a drop that increases your speed to 12 m/s in 4 s. find your acceleration? i need help answer?
*October 22, 2012 by dem*

**U Hart**

The 50 kg cylinder shown, which was initially at rest, rolls without slipping. when the speed of A is 20 cm\s, the speed of point B is most nearly
*January 14, 2013 by Jason*

**chemistry**

if the average speed of a helium atom at a certain temperature is 1130. m/s, what is the speed in miles per hour? (1 mi =1609m)
*September 7, 2014 by azoz*

**Algebra**

The speed of a boat in still water is 20 mph. It travels 24 mi upstream and 24 mi downstream in a total time of 10 hr. what is the speed if the current?
*March 20, 2015 by Yin*

**science**

a particle moves 1/3rd of the distance in aspeed of 6km/hr and rest with a speed of 18km/hr.find the average speed?
*September 9, 2015 by sidharth*

**math**

10. A military jet flies horizontally with a velocity of 450 m/s and 20,000 m above the ground. When the jet is straight above an artillery gun a shell is fired. Assuming the shell hits the jet. a. Calculate the horizontal component of the initial velocity of the shell. b. ...
*September 20, 2015 by alfred*

**calculus**

10. A military jet flies horizontally with a velocity of 450 m/s and 20,000 m above the ground. When the jet is straight above an artillery gun a shell is fired. Assuming the shell hits the jet. a. Calculate the horizontal component of the initial velocity of the shell. b. ...
*September 20, 2015 by Sue*

**Help...pHysics**

a ball is thrown at 15m/s at an angle of 30 degrees to the horizontal , how far does it travel horizontally before making contact with the ground? I don't remember very well, but I believe the formula you need is: x0 = -.5at^2 + vt + x where x0 is the initial distance (a.k.a...
*October 7, 2006 by sean*

**algebra**

during the first part of a trip, a conoeist travels 70 miles at a certain speed. the canoeist travles 7 miles on the second part of the trip at a speed of 5 mph slower. the total time for the trip is 5 hrs. Ehat is the speed on each part of the trip?
*July 6, 2012 by todd*

**Physics**

A 700-kg car stopped at an intersection is rear-ended by a 1710-kg truck moving with a speed of 16.0m/s . 1) If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of the truck. 2)Find the final speed of the car.
*October 25, 2013 by Lhaedy*

**Physics**

A discus thrower accelerates a discus from rest to a speed of 25m/s by whirling it at 1.25 rev. The discus moves in circle of radius 1m. Find a. The final angular speed, b. The constant angular acceleration, c. The time interval from rest to the speed 25m/s. Thanks for the help!
*February 28, 2016 by Edge*

**Physics**

A certain wave is incident on an interface at an angle of 40 deg. The wave emerges into the other material at an angle of 30 deg. Crossing the interface, the wave: a. increased speed b. reduced speed c. maintained constant I think reduces its speed, but I'm not sure.
*November 13, 2010 by Jarod*

**Physics**

A rifle with a weight of 20N fores a 5.0g bullet with a speed of 300m/s. (a) Find the recoil speed of the riffle (b) If a 700-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and the rifle. Please show work. Thank you!
*July 14, 2013 by Xian*

**Maths-Proportions**

1) An aircraft flying at 500 km/h completes a journey in 8.4 h. How long would the journey take if it flew at a speed of 420 km/h? 2) Jackie can drive to work in 18 mins if he travels at an average speed of 35 m.p.h. How long will the journey take if she drives at an average ...
*August 22, 2015 by Sami*

**Algebra**

a boat travels 60 miles to an island and 60 miles back again. The return trip is 3 mph slower than the speed on the way out. The total time of the trip took 9 hours. Find the speed going to the island and the speed of the return trip.
*March 1, 2016 by Whatt*

**physics**

A cheetah runs a distance of 102 m at a speed of 27 m/s and then runs another 102 m in the same direction at a speed of 34 m/s. What is the cheetah's average speed?
*September 18, 2010 by john*

**Physics**

A cheetah runs a distance of 101 m at a speed of 24 m/s and then runs another 101 m in the same direction at a speed of 38 m/s. What is the cheetah's average speed?
*August 25, 2011 by Logan*

**Physics-dynamics**

A circular plate with a slot in its surface is rotating with angular velocity ω and angular acceleration α with respect to a fixed coordinate system, OXYZ. A ball B moves along the slot in the direction shown with velocity, v, and acceleration, a, both measured ...
*November 18, 2013 by Michael*

**Modern World Histoy**

What would one say their experiences may be during A Bloody Stalemate? Think about a soccer game where no matter what either team does, neither is able to win. Both have gone through all there player list; both have gone through the over times..... How would they feel, when it...
*February 26, 2007 by Dennis*

**Maths**

The speed of a falling object is directly proportional to the time for which it falls. The speed after 5 seconds is 49 metres/seconds. What is the speed of an object which falls for 8 seconds?
*February 22, 2016 by Taylah*

**Maths**

The speed of a falling object is directly proportional to the time for which it falls. The speed after 5 seconds is 49 metres/seconds. What is the speed of an object which falls for 8 seconds?
*February 22, 2016 by Taylah*

**physics**

When a lead bullet hits a solid target at high speed, its entire kinetic energy is converted into heat. For simplicity, assume that all the heat is concentrated in the bullet rather than the target. If the bullet's initial temp. is 20` C, how fast should it be moving before ...
*February 19, 2010 by elisabeth*

**Physics**

A 3,0kg cart moving East with a speed of 1.0ms^-1 collides head-on with a 5.0 kg cart that is initially moving West with a speed of 2.0 m.s^-1. After the collision, then 3.0 kg cart is moving to the left with a speed of 1.0 m.s^-1. IGNORE THE FRICTION, WHAT IS FINAL VELOCITY ...
*January 24, 2016 by Asive*

**Math**

During the first part of a trip, a canoeist travels 33 miles at a certain speed. The canoeist travels 2 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 4 hours. What was the speed on each part of the trip? The speed on the first ...
*April 21, 2011 by Ray*

**Physics**

You and a friend are going to ride on a Ferris wheel. For a little extra fun, when your friend is at the very top of the Ferris wheel she's going to drop a tennis ball. How far around the Ferris wheel in radians from your friend should you sit so you can catch the ball? ...
*June 11, 2013 by montes*

**math**

The height of a rocket in meters t seconds after it is launched is approximated by the polynomial 0.5 at2 + vt + y where a is always -9.8, v is the initial velocity, and h is the initial height. The 4400i was launched from the ground at the same time the Q99 was launched from ...
*August 16, 2010 by jacob*

**Physics**

Several volcanoes have been observed erupting on the surface of one of Jupiter's closest moons. Suppose that material ejected from one of these volcanoes reaches a height of 4.96 km after being projected straight upward with an initial speed of 132 m/s. Given that the radius ...
*April 28, 2012 by Jane *

**college physics**

a golfer rides in a golf cart at an average speed of 3.10 meters/sec for 28.0 sec. she then gets out of the cart and starts walking at an average speed of 1.30 m/s. for how long in seconds must she walk if her average speed for the entire trip, riding and walking is 1.8m/s?
*October 5, 2008 by ksunhsine*

**Math-Algebra**

A car takes 3 hours to travel a distance of 240 km with a speed of 80 km/h while a motorbike can cover the same distance in 4 hours if its travels at a speed of 60 km/h. Explain why the speed and the time it takes for the vehicles to travel a certain distance exhibit an ...
*November 13, 2013 by McKenna Louise*

**Math**

The speed of sound in air at sea level at 32 degrees Fahrenheit is 1088 ft/s. If that represents only 22.04% of the speed of sound in ice-cold water, what is the speed of sound in ice-cold water, to the nearest whole number? what i did: 22.04/100 = 32/x i set up this ...
*January 16, 2015 by Katy*

**Physics please help!!!!!**

A circular plate with a slot in its surface is rotating with angular velocity ω and angular acceleration α with respect to a fixed coordinate system, OXYZ. A ball B moves along the slot in the direction shown with velocity, v, and acceleration, a, both measured ...
*November 18, 2013 by Michael*

**Algebra**

During the first part of a trip, a canoeist travels 98 miles at a certain speed. The canoeist travels 10 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 3 hours. What was the speed on the FIRST part of the trip? What was the speed ...
*July 24, 2011 by Greg*

**Physics**

Particle 1 of mass 3m initially moving with a speed v0 in the positive x-direction collides with particle 2 of mass m moving in the opposite direction with an unknown speed v.After collision,particle 1 moves along the negative y-direction with speed v0/2 and particle 2 moves ...
*March 26, 2016 by Divya*

**physics**

A commuting student leaves home and drives to school at an average speed of 41.0 km/h. After 24.0 min she realizes that she has forgotten her homework and returns home to get it at the same average speed. It takes 9.0 min to find the report, after which the trip to school 41.0...
*August 29, 2011 by bill*

**physics**

A commuting student leaves home and drives to school at an average speed of 42.0 km/h. After 20.0 min he realizes that he has forgotten his homework and returns home to get it at the same average speed. It takes 7.0 min to find the report, after which the trip to school 42.0 ...
*September 8, 2013 by Lauren*

**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 ...
*September 28, 2015 by Anonymous*

**College physics**

A 0.45 mass is attached to a spring with a force constant of 26 and released from rest a distance of 3.2 from the equilibrium position of the spring. a.What is the maximum speed of the mass? (m/s) b.How far is the mass from the equilibrium position when its speed is half the ...
*December 3, 2009 by Mary*

**College Physics**

Consider a rock thrown off a bridge of height 78.5 m at an angle è = 25° with respect to the horizontal as shown in Figure P4.20. The initial speed of the rock is 15.6 m/s. Find the following quantities: (a) the maximum height reached by the rock (b) the time it takes the rock...
*September 12, 2011 by HELP*

**Physics**

During volcanic eruptions, chunks of solid rock can be blasted out of the volcano; these projectiles are called volcanic bombs. (a) At what initial speed would a bomb have to be ejected, at angle 35degrees to the horizontal, from the vent at A in order to fall at the foot of ...
*December 28, 2015 by Dee*

**maths**

A ball is launched into the air from below a cliff. after t seconds its height above the cliff top is h metres, and is given by the equation h = − 4.9t 2 + 19.6t − 14.6. Calculate, to the nearest metre, the ...
*March 29, 2011 by elizabeth*

**Physics**

A flywheel with a diameter of 2.45 m is rotating at an angular speed of 74.1 rev/min. (a) What is the angular speed of the flywheel in radians per second? (b) What is the linear speed of a point on the rim of the flywheel? (c) What constant angular acceleration (in revolutions...
*November 9, 2011 by kyle*

**physics**

Two cars start from rest at the same location and at the same instant and race along a straight track. Car A accelerates at 6.6 fps2 to a speed of 90 mph and then runs at this constant speed. Car B accelerates at 4.4 fps2 to a speed of 96 mph and then runs a a constant speed...
*January 22, 2011 by David*

**Physics**

One end of a thin uniform rod, 1.00m in length, is attached to a pivot. The rod is free to rotate about the pivot without friction or air resistance. Initially, it is hanging straight down (the "6 o' clock position). Then the lower tip is given an initial horizontal speed of ...
*December 4, 2009 by John*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) With ...
*October 4, 2013 by Jeff*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) With ...
*October 4, 2013 by Jeff*

**physics**

An airplane is travelling at a speed of 600 mph on a heading of 345 degrees. There is a wind moving at a speed of 70 mph on a heading of 20 degrees. The pilot would like to maintain his planned course. Find the speed and heading he should set in order to travel with the wind ...
*November 15, 2015 by johnny*

**math**

Matt and Anna are frequent fliers on Fast n Go Airplanes. They often fly between two cities that are a distance of 1680 miles apart. On one particular trip, they flew into the wind and the trip took 4 hours. the return trip with the wind behind them, only took about 3 hours. ...
*May 27, 2008 by aaron*

**physical**

During July 1995 the comet Shemaker-Levy 9 smashed into Jupiter in a spectacular fashion. The comet actually consisted of 21 distinct pieces, teh largest of which had a mass of about 4x1012 kg and a speed of 6x104 m/s. Jupiter, the largest planet in the solar system , has a ...
*April 18, 2013 by Mervyn*

**physic **

A police car is travelling in a straight line with constant speed vp.A truck travelling in the same direction with speed 3/2 vp passes the police car.The truck driver realizes that she is speeding and immediately begins to slow down at a constant rate until she comes to a stop...
*February 11, 2011 by shaiz*

**Physics, Elena Please Help If u can.**

A circular plate with a slot in its surface is rotating with angular velocity ω and angular acceleration α with respect to a fixed coordinate system, OXYZ. A ball B moves along the slot in the direction shown with velocity, v, and acceleration, a, both measured ...
*November 18, 2013 by Michael*

**physics - sound level**

The source of a sound wave has a power of 2.50 µW. Assume it is a point source. (a) What is the intensity 6.70 m away? I used I = Power / 4*pi*r^2 and found I to be 4.43x10^-9 W/m^2 (b) What is the sound level at that distance? Sound level = 10 dB*log [(Intensity)/(Intensity ...
*April 21, 2007 by COFFEE*

**Physics**

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor on its way back up C...
*September 18, 2014 by Edward*

**Physics**

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor on its way back up C...
*September 20, 2014 by Edward*

**Mechanics**

A bullet is fired a plank of wood with a speed of 200m/s. After passing through the plank, its speed reduces to 180m/s. Another bullet identical with a speed of 100m/s is fired at the same plank. What is the speed of this bullet after passing through the plank. (resistance ...
*October 7, 2015 by Kusemererwa Robert*

**Physics help--explosion**

Figure 9-56 shows a two-ended "rocket" that is initially stationary on a frictionless floor, with its center at the origin of an x axis. The rocket consists of a central block C (of mass M = 6.00 kg) and blocks L and R (each of mass m = 2.90 kg) on the left and right sides. ...
*December 2, 2006 by fizzix*

**Class 11th Physics**

My question is that, I read about Instantaneous Speed "Instantaneous speed of an object at an instant of time (t) is defined as the 'limit of the average speed as the time interval delta(t) at the given instant of time becomes infinitesimally small.'" What does this paragraph ...
*August 8, 2009 by Akashdeep*

**Physics **

You are driving south on a highway at 24.0 m/s (approximately 54 mi/h) in a snowstorm. When you last stopped, you noticed that the snow was coming down vertically, but it is passing the windows of the moving car at an angle of 26.6° to the horizontal. Calculate the speed of ...
*February 5, 2012 by Jeremy *

**maths**

The probability of getting a blue ball is 2/3 from a bag containing 6 blue and 3 red balls. 12 red balls are added to the bag then find the probability of getting a blue ball
*March 10, 2011 by susan*

**Physics**

A personne walking at a speed of 1.7m/s see's a stoped bus 25m from him. At this moment this person starts to run with an acceleration of 1,3m/s2. After 4 secondes this personne has reached his maximum speed et it stays constant, but at the same time the bus starts moving and ...
*March 22, 2007 by Nick*