Sunday

April 19, 2015

April 19, 2015

Number of results: 31,499

**physics**

A daredevil on a motorcycle leaves the end of a ramp with a speed of 29.0 m/s as in the figure below. If his speed is 26.7 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
*October 4, 2008 by Sandhya*

**Physics**

Catching a wave, a 65 kg surfer starts with a speed of 1.3 m/s, drops through a height of 2.10 m, and ends with a speed of 8.2 m/s. How much nonconservative work was done on the surfer? I have genuinely no idea how to solve this problem.
*March 29, 2010 by Carden*

**physics**

ottawa is about 8 hours drive from x. assume that you are moving non-stop with constant speed of 100km/h how much faster would it take for you to travel if you were moving with the speed of light
*April 5, 2010 by he*

**physics**

The speed in air is 343m/s. Using the relationships3.3 feet in a meter, 5280 feet in a mile, and the time relationships you know, determine the speed in miles per hour. (answer:772mi/h)
*September 10, 2010 by Anonymous*

**College Physics**

A 1200 kg airplane starts from rest and with a constant average forward acceleration of magbitude 5.0 m/s, reaches its takeoff speed in 9.00 s. The runway is 300 m long. What is the plane's takeoff speed?
*September 14, 2010 by Dakota*

**college physicalscience**

the air speed of a plain is 223km/h and the pilot keeps the plane pointed north. A wind is blowing73.6km/h from the west. Determine the speed (in km/h) of the plane relative to the ground
*September 19, 2010 by tiana*

**physics**

An athlete executing a long jump leaves the ground at a 20° angle and travels 7.80 m. (a) What was the takeoff speed? 1._____ m/s (b) If this speed were increased by just 5.0%, how much longer would the jump be? 2.______ m
*September 21, 2010 by jake*

**Physics**

A daredevil on a motorcycle leaves the end of a ramp with a speed of 33.0 m/s as in the figure below. If his speed is 31.3 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
*October 13, 2010 by Abdullah*

**physics**

A 2.20 kg box slides down a rough incline plane from a height h of 1.39 m. The box had a speed of 2.77 m/s at the top and a speed of 2.34 m/s at the bottom. Calculate the mechanical energy lost due to friction
*November 21, 2010 by help*

**physics**

You are driving in your car and you apply a constant force to your brake pedal. Which of the following are changing? (Ignore air resistance) a. Speed b. Velocity c. Acceleration d. Speed and Velocity e. All of the above
*February 2, 2011 by Victor*

**physics**

A daredevil on a motorcycle leaves the end of a ramp with a speed of 29.5 m/s as in the figure below. If his speed is 27.1 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
*March 9, 2011 by Allie*

**Physics**

Suppose the roller coaster in Fig. 6-41 (h1 = 30 m, h2 = 11 m, h3 = 20) passes point 1 with a speed of 2.10 m/s. If the average force of friction is equal to one fifth of its weight, with what speed will it reach point 2? The distance traveled is 50.0 m.
*April 15, 2011 by Brittney*

**chemistry**

if the rms speed of NH3 molecules is found to be 0.510 km/s what is the temperature (in Celcius)? can someone solve this using the formula c=((2.55*R*T)/M)^1/2 c is the speed r is 8.314 constant M is the molar mass of NH3 17.031
*August 5, 2011 by Henry*

**physics**

The actual speed of electrons drifting along in a common electric circuit is about the speed of which of the following?. A) sound.B) a fast-moving automobile.C) light.D) a slow-moving snail.
*April 14, 2012 by britches*

**physics**

A hockey puck is hit on a frozen lake and starts moving with a speed of 14.4 m/s. 3.0 seconds later, its speed is 7.3 m/s. (b) What is the average value of the coefficient of kinetic friction between puck and ice?
*October 5, 2012 by Anonymous*

**algebra**

The 4200 km trip from New York to San Francisco take 6 h flying against the wind but only 5 h returning. Find the speed of the plane in still air and the speed of the wind.
*November 7, 2012 by Samantha*

**physics**

Suppose the roller coaster in Fig. 6-41 (h1 = 34 m, h2 = 10 m, h3 = 30) passes point 1 with a speed of 1.60 m/s. If the average force of friction is equal to one fourth of its weight, with what speed will it reach point 2? The distance traveled is 60.0 m.
*November 26, 2012 by Sarah*

**physics**

Suppose the roller coaster in Fig. 6-41 (h1 = 38 m, h2 = 11 m, h3 = 25) passes point 1 with a speed of 1.60 m/s. If the average force of friction is equal to one sixth of its weight, with what speed will it reach point 2? The distance traveled is 45.0 m.
*November 29, 2012 by bob*

**Intermediate Algebra**

The speed of a boat in still water is 29mph. if the boat travels 140mph downstream in the same time that it takes to travel 92miles upstream, find the speed of the stream.
*December 2, 2012 by Wanda*

**Physics**

c) A penny sits 12 cm from the center of a record turning at 33 1/3 rpm. What is the tangential speed in m/s? d) A mass spins with a tangential speed of 1.2 m/s on the end of a string which is 0.75m long. What is the period of the rotation in seconds?
*January 3, 2013 by Alex*

**Physics**

c) A penny sits 12 cm from the center of a record turning at 33 1/3 rpm. What is the tangential speed in m/s? d) A mass spins with a tangential speed of 1.2 m/s on the end of a string which is 0.75m long. What is the period of the rotation in seconds?
*January 3, 2013 by Alex*

**Physics**

A 17000 kg railroad car travels along on a level frictionless track with a constant speed of 23.0 m/s. A 5100 kg additional load is dropped onto the car. What then will be its speed in meters/second?
*July 10, 2013 by Zach*

**Physics**

The object in the figure has a mass of 3.45 kg and is pulled up a slope AB, which is 36 m long; the height BC is 3.00 m. There is no friction and the acceleration is constant. The speed v1 at A is 3.5 m/s whereas the speed v2 at B is 5.5 m/s. The average power developed by the...
*February 22, 2014 by kjean*

**science**

A man moves on his bike with 54km/h and takes u- tune (180 degree)and continues it speed to move with same speed .the time of u-tune is 10sec.find its average accleration
*July 2, 2014 by roli*

**physics**

Suppose a roller-coaster car starts at a height of 39 m with a speed of 2.51 m/s. What will its speed be at height = 0m if the average force of friction is equal to 0.22 times its weight? The total distance traveled is 53m.
*October 13, 2014 by robbie*

**math**

The record for the fastest speed on a bicycle is 133 kilometers per hour. How long would it take a person traveling at this speed to travel 365.75 kilometers? hours and minutes
*January 7, 2015 by gabrielle*

**PHYSICS**

A car is traveling 27 m/s when the driver sees a child standing in the road. He takes 0.8 s to react, then steps on the brakes and slows at 8.0 m/s2. How far does the car go before it stops? please help!! Since he's going 27 m/s, and he takes 0.8 s to react, then he goes (27)(...
*September 26, 2006 by Katelyn*

**English**

1.All of the balloons on the string (popped) except two. 2.Do you (want) to buy those books? 3.Daniel's dog is (following) the trail to the river's edge. 4.For thirty years the noon whistle has (blown)exactly on time. 5.The players have (challenged) their parents to a game of ...
*January 25, 2011 by Tracy*

**physics**

Coasting due west on your bicycle at 7.9 , you encounter a sandy patch of road 7.0 across. When you leave the sandy patch your speed has been reduced by 2.0 to 5.9 . 1. Assuming the sand causes a constant acceleration, what was the bicycle's acceleration in the sandy patch? ...
*September 10, 2012 by Rach*

**physics**

A 124- balloon carrying a 22- basket is descending with a constant downward velocity of 16.3 A 1.0- stone is thrown from the basket with an initial velocity of 18.7 perpendicular to the path of the descending balloon, as measured relative to a person at rest in the basket. The...
*September 30, 2010 by =]*

**Pre-Calc**

You are taking a road trip in a car without A/C. The temperture in the car is 93 degrees F. You buy a cold pop at a gas station. Its initial temperature is 45 degrees F. The pop's temperature reaches 60 degrees F after 23 minutes. Given that \frac{T-A}{T_0 - A} = e^{-kt} where...
*October 20, 2014 by Anonymous*

**Mathematics**

Project A requires an initial outlay of $6,000,000 but will return $4,000,000 at the end of each year 1, 2, 3 and 4 whereas project B requires an initial outlay of $2,400,000 but will return $3,500,000 at the end of years 1, 2, 3 and 4. (i) calculate the NPV of each project if...
*June 22, 2010 by Gibbons*

**physics**

A bicycle has wheels 67.3 cm in diameter and pedal cranks 17.5 cm long. The cyclist pedals at a steady cadence of 76.0 rev/min. The chain engages with a front sprocket 15.2 cm in diameter and a rear sprocket 7.00 cm in diameter. Calculate: a) the speed of a link of the chain ...
*November 4, 2008 by Mischa*

**probablity**

You are off to soccer and love being a goalkeeper, but that depends who is the coach today : - with coach Ahmed the probablity of being a goalkeeper is 0.5 -with coach Usman the probability of being a goalkeeper is 0.3 Ahmed is coach more often.About 6 out of every 10 games ( ...
*May 3, 2013 by arzam*

**physics**

1) What average power is required for a runner with a mass of 85 kg to reach a speed of 8 m/s from a stationary start during a time of 2 s? 2) A 1000 kg car travels east at 30 m/s and collides with a 3400 kg truck travelling south at 20 m/s. After the collision the two ...
*March 29, 2015 by k*

**Physics**

To qualify for the finals in a racing event, a race car must achieve an average speed of 225 km/h on a track with a total length of 1.4 km. If a particular car covers the first half of the track at an average speed of 205 km/h, what minimum average speed must it have in the ...
*June 15, 2014 by Piper*

**physics**

A 0.500 ice puck, moving east with a speed of 6.70 , has a head-on collision with a 0.700 puck initially at rest. Assuming a perfectly elastic collision, what will be the speed of the 0.500 object after the collision? What will be the speed of the 0.700 object after the ...
*February 2, 2012 by andrew*

**Science**

A 0.500 kg ice puck, moving east with a speed of 3.30 m/s, has a head-on collision with a 0.900 kg puck initially at rest. Assuming a perfectly elastic collision, (a) what will be the speed of the 0.500 kg object after the collision? (b) What will be the speed of the 0.900 kg ...
*November 25, 2012 by nammilee_2012*

**algebra**

A boy walked for 4 hours and cycled for 3 hours,covering a total distance of 74 kilometers,later he walked for 2 hours and cycled for 4 hours ,covering 82 kilometers,what were his average speed of walking and his average speed of cycling if his speed was constant in the two ...
*March 13, 2013 by 007*

**P.E check my answers**

1.Select the community activity that is a healthy choice to promote fitness for all ages A.annual 5K fun run for charity<--- B.annual state fair C.monthly movie in the park D.monthly laser light show at the planetarium 2.Mollie is well respected by her teammates even though...
*February 27, 2014 by Help!!*

**Math**

y = 0.005x^2-0.801x+46.928 ^ Using that model above, how di I determine the cost per km to the nearest tenth of a cent, at a speed of 70 km/h? I think I use a graphing calculator for this, and since speed is the x value I probably have to insert in 70.
*December 7, 2011 by -Untamed-*

**algebraA**

lond distance trucker traveled 156 miles in one directionduring a storm. Thereturn trip in rainy weather was accomplished at double the speed and took 3hrs less time. Find the speed going.
*June 1, 2012 by ll*

**Mechanics**

A 1000-kg car whose motor delivers a maximum power of 40.0 hp to its wheel can maintain a steady speed of 130 km/h on a horizontal roadway. How large is the friction force that impedes its motion at this speed? Show the solution and answer
*September 15, 2013 by Jason*

**math**

An airplane travels with a speed of 145 mph in calm air. the wind is blowing with a velocity of 23 mph from N72degreesE. If the plane is headed in a direction N63W, find the magnitude of the speed and the direction of the airplane with reference to the ground. In what ...
*February 24, 2015 by Dan*

**Physics**

A lighthouse beacon alerts ships to the danger of a rocky coastline. Part A According to the lighthouse keeper, with what speed does the light leave the lighthouse? v/c= A boat is approaching the coastline at speed 0.5. According to the captain, with what speed is the light ...
*December 2, 2012 by Amy*

**Math**

Use this equation to estimate typing speed, S=w/5-2e, where S is the accurate typing speed, w is the number of words typed in 5 minutes, and e is the number of errors. Choose the letter for the best answer. One of the qualifications for a job is a typing speed of at least 65 ...
*February 28, 2012 by Katie*

**Algebra**

If a plane can travel 500 miles per hour with the wind 400 miles per hour against the wind, find the speed of the plane without a wind and the speed of the wind? What is the speed of the plane in still air?
*March 24, 2012 by rangel*

**Science - Waves - Sci. Notation**

I know that the formula to calculate the speed of light is c=fλ. F is the frequency, c is the speed, and λ is the wavelength. So how do I calculate the wavelength of a purple light with a frequency of 750 * 10^12 HZ. Frequency is measured in HZ. The speed is measured...
*January 31, 2013 by Jamia*

**Rate Constant - My Work is Incorrect**

Hi! I am stuck with this question and I would like to know what I did wrong: Given that the initial rate constant is 0.0160 s-1 at an initial temperature of 25 degrees C, what would the rate constant be at a temperature of 130 degrees C for the same reaction described in Part ...
*February 3, 2013 by Amy*

**Physics - urgent**

I already asked this and was given an answer, but I don't fully understand it and so would like a further explanation. What I asked was... An electron is accelerated through a uniform electric field of magnitude 2.5x10^2 N/C with an initial speed of 1.2x10^6 m/s parallel to ...
*April 21, 2009 by Linn*

**Intermediate Algebra Word Problem**

A river's current is 4mph. A boat travels 48 miles downstream in the same time it travels 24 miles upstream. Find the speed of the boat. A) What does the variable stand for? x stands for the speed of the boat. B) Write the equation. 24/x - 4 = 48/x + 4 C) Solve. 24/x - 4 = 48/...
*February 11, 2009 by Jennifer*

**phyics**

An athlete in a competition needs to get from point A to another point B directly across from a river. He can swim in stationary water at a speed of 2.0 mi/h, and he can run at a speed of 5.0 mi/h. If the river does not flow, then to get from A to B he would certainly choose ...
*February 11, 2011 by Roxie Anne*

**physics**

A hawk is flying horizontally at 14.0 m/s in a straight line, 250 m above the ground. A mouse it has been carrying struggles free from its grasp. The hawk continues on its path at the same speed for 2.00 s before attempting to retrieve its prey. To accomplish the retrieval, it...
*February 16, 2011 by Anonymous*

**Physics**

A missile is shot straight up into the air. At the peak of its trajectory, it breaks up into three pieces of equal mass, all of which move horizontally away from the point of the explosion. one piece travels in a horizontal direction of 28degrees east of north with a speed of ...
*October 13, 2011 by Anonymous*

**physics**

A merry-go-round at a playground is a circular platform that is mounted parallel to the ground and can rotate about an axis that is perpendicular to the platform at its center. The angular speed of the merry-go-round is constant, and a child at a distance of 1.4 m from the ...
*October 22, 2014 by vik*

**dynamics**

A slotted disk is rotating with constant angular velocity ω−−, as shown in the figure. A ball of mass m slides out from the center of the disk. Kinetic friction force F=μk|N| acts on the mass, where N is the normal force between the ball and the channel. ...
*November 10, 2013 by solid chem*

**physics**

A projectile is shot from the edge of a cliff h = 125 m above ground level with an initial speed of v0 = 145 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 ...
*October 16, 2014 by zg*

**Physics**

two cars, one with mass m1=1000kg and the other with mass m2= 4000kg crash in an intersection. Before the crash, car m1 was headed east with a speed of v1i= 25 m/s and the car m2 was headed north with a speed of v2i= 10m/s. After the crash, the cars stick together. what is the...
*February 3, 2011 by Scott*

**Writing**

I decided to rewrite the essay regarding to the prompt about individual responsibility. Essay Have you ever ignored someone who needed help and felt guilty afterward? This exercp talks about a man who ignored the dog like everybody else, for he assumed that it was not injured...
*August 10, 2013 by Anonymous*

**Chemistry 2**

I have to calculate the Ccal using the following info: Initial Temp of water outside calorimeter=22.6 C Initial Temp of water inside the calorimeter= 100 C Volume of water in calorimeter= 50mL Volume of water outside calorimeter= 300mL Final Temp of water in calorimeter=27.9 C...
*July 16, 2011 by Lily*

**Physics **

An open train car moves with speed 11.3 m/s on a flat frictionless railroad track, with no engine pulling the car. It begins to rain. The rain falls straight down and begins to fill the train car. The speed of the car 1. increases. 2. decreases. 3. stays the same. A(n) 71.6 kg...
*January 11, 2012 by Kudo*

**Chemistry **

Currently studying for an lab exam. Just have a few question about a typical Iodine Clock reaction lab. In an typical Iodine Clock reaction lab what would be the state of effect of an increase in the initial concentration of persulfate ion and the increase in the initial ...
*February 17, 2013 by Ahmad M*

**physics**

At what speed should a space probe be fired from the earth if it is required to still be traveling at a speed of 3.48 km/s, even after coasting to an exceedingly great distance from the planet (a distance that is essentially infinite)?
*March 4, 2008 by shelby*

**physics**

A stone is thrown vertically upward with a speed of 10.0 m/s from the edge of a cliff 59.0 m high. How much later does it reach the bottom of the cliff? What is its speed just before hitting? What total distance did it travel?
*September 13, 2009 by Anonymous*

**phy 111**

A daredevil on a motorcycle leaves the end of a ramp with a speed of 34.5 m/s as in the figure below. If his speed is 32.1 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
*October 14, 2010 by blake *

**physics**

When the Sun is directly overhead, a hawk dives toward the ground at a speed of 6.97 m/s. If the direction of his motion is at an angle of 34.1 below the horizontal, calculate the speed of his shadow along the ground. Answer in units of m/s
*September 15, 2011 by jim*

**Physics**

A hunter wishes to cross a river that is 1.6 km wide and that flows with a speed of 4.8 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.6 km/h with respect to the water. What is the minimum time necessary for crossing?
*January 19, 2012 by Emily*

**physics**

A hunter wishes to cross a river that is 2.5 km wide and that flows with a speed of 6.0 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.8 km/h with respect to the water. What is the minimum time necessary for crossing?
*December 13, 2012 by Anonymous*

**physics **

A hunter wishes to cross a river that is 2.0 km wide and that flows with a speed of 5.1 km/h. The hunter uses a small powerboat that moves at a maximum speed of 12.3 km/h with respect to the water. What is the minimum time necessary for crossing?
*December 17, 2012 by Anonymous*

**Karnataka state university**

A baThe power developed by a man in riding up a 6 percent grade at a constane speed is 200 W the man and his bicycle have a combined mass of 80 kg.Determine the speed of rding
*July 22, 2013 by Kiran*

**Science**

Assume the speed of a nerve impulse is 100 m/s. How does this compare to the speed of electricity in a copper wire (approximately 3.00*10^8 m/s)? What does this tell you about the flow of electrons in a wire compared to the movement of ions in a membrane?
*October 8, 2013 by Colleen*

**Science/Physics**

The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 46 m in a straight line, reaching a final speed of 73 km/h.
*October 20, 2013 by Abena*

**physics**

a stone is thrown vertically upward with a speed of 10.5 m/s from the edge of a cliff 76.0 m high. how much later does it reach the bottom of cliff? what is its speed just before hitting? what total distance did it travel
*February 9, 2014 by jo*

**Physics **

Two automobiles, each of mass 800kg , are moving at the same speed, 18m/s , when they collide and stick together. At what speed does the wreckage move if one car was driving north and one east.
*February 21, 2014 by Ty *

**Physics**

Two automobiles, each of mass 1000kg , are moving at the same speed, 17m/s , when they collide and stick together. At what speed does the wreckage move if one car was driving north and one east?
*February 28, 2014 by Anonymous*

**physics**

On a 60 km straight road,a bus travels the first 30km with a uniform speed of 30kmh .How fast must the bus travel the next 30 km so as to have average speed of 40 kmh for entire trip.
*July 8, 2014 by swift*

**physics**

A hunter wishes to cross a river that is 1.0 km wide and that flows with a speed of 4.9 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.6 km/h with respect to the water. What is the minimum time necessary for crossing?
*September 28, 2014 by jo*

**Engineering**

what heading must a pilot fly to compensate for a 125km/h west wind to have a ground track that is due south? The airecraft cruise speed is 600 km/h. What is the actual ground speed?
*October 8, 2014 by Anna*

**physics**

An athlete performing a long jump leaves the ground at a 27.1∘ angle and lands 7.72m away 1.What was the takeoff speed? 2.If this speed were increased by just 5.0%, how much longer would the jump be?
*January 31, 2015 by Kelly*

**physics**

a car moves from A to B covering a distance of 1000km it covers the first 300km at 60km/h the next 400km at 80 km /h at what speed it should it cover the remaining distance so that achieve an average speed of 70km/h?
*April 10, 2015 by jhanvi*

**Physics but could be just Math ?????**

A creature moves at a speed of 5.00 furlongs per fortnight (not a very common unit of speed). Given that 1 furlong= 220 yards and 1 fortnight= 14 days determine the speed of the creature in m/s. ~ for this question: know: 5 furlongs/ fortnight 1fortnight= 14days (5furlongs/...
*September 16, 2007 by ~christina~*

**math **

A ship leaves a port at 12:00 Noon and sails East at speed of 10 miles/hour. Another ship leaves the same port at 1:00 PM and sails North at a speed of 20 miles/hour. At what time are the two ships going to be 50 miles apart from each other? (Hint: Distance = Speed * Time)
*May 8, 2013 by Anonymous*

**math **

A ship leaves a port at 12:00 Noon and sails East at speed of 10 miles/hour. Another ship leaves the same port at 1:00 PM and sails North at a speed of 20 miles/hour. At what time are the two ships going to be 50 miles apart from each other? (Hint: Distance = Speed * Time)
*May 8, 2013 by Anonymous*

**math **

A ship leaves a port at 12:00 Noon and sails East at speed of 10 miles/hour. Another ship leaves the same port at 1:00 PM and sails North at a speed of 20 miles/hour. At what time are the two ships going to be 50 miles apart from each other? (Hint: Distance = Speed * Time)
*May 8, 2013 by Anonymous*

**math**

Hitomi has a total of 30 red and blue bowling balls ate her bowling alley. Each red ball weighs 8 lb. Each blue ball weighs 9 lb. If the total mass of the blue balls is 49 lb. heavier than the total mass of the red balls, how many red balls does she have?
*March 2, 2011 by anna*

**Physics (4)**

A 4.0-kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall. The particle rebounds with a speed of 3.0 m/s. What is the magnitude of the impulse delivered to the particle?
*October 29, 2011 by Anonymous*

**physics**

A speed skater goes around a turn that has a radius of 29 m. The skater has a speed of 14 m/s and experiences a centripetal force of 450 N. What is the mass of the skater?
*October 24, 2012 by Anonymous*

**Physics**

A speed skater goes around a turn that has a radius of 31 m. The skater has a speed of 13 m/s and experiences a centripetal force of 460 N. What is the mass of the skater?
*October 25, 2012 by Orla*

**physics**

A speed skater goes around a turn that has a radius of 33 m. The skater has a speed of 13 m/s and experiences a centripetal force of 460 N. What is the mass of the skater?
*October 28, 2013 by Anonymous*

**physics 1**

A speed skater goes around a turn that has a radius of 35 m. The skater has a speed of 14 m/s and experiences a centripetal force of 460 N. What is the mass of the skater?
*February 23, 2014 by Anonymous*

**Physics**

A spacecraft launches a probe at a constant speed. A day later, the probe returns at the same speed. Did the probe have to burn any fuel?
*April 18, 2010 by Eloise*

**Physics**

A 15.0 g rubber bullet hits a wall with a speed of 140 m/s. If the bullet bounces straight back with a speed of 125 m/s, what is the change in momentum of the bullet?
*November 24, 2010 by Kelsey*

**physics**

Boxing gloves are padded to lessen the force of a blow. (a) Calculate the force exerted by a boxing glove on an opponent's face, if the glove and face compress 7.00 cm during a blow in which the 8.00 kg arm and glove are brought to rest from an initial speed of 10.0 m/s. 1 N (...
*April 10, 2012 by Amelia*

**Physics**

A flatbed truck with a box sitting on the bed accelerates from rest on level ground. The truck’s speed as a function of time is 15t –2t^2 during this acceleration. The truck reaches its maximum speed and cruises along at this speed for 4 minutes. It then slows to a stop with ...
*August 10, 2012 by Chad*

**Statistics**

An investigational drug study is being conducted. The initial screening phase needs to include enough people so that the final (approved) group has at least 10 patients. The probability of a person being approved for the study is .80. what initial sample size is needed to make...
*June 6, 2009 by Craig*

**Arrhenius Reaction**

The activation energy of a certain reaction is 32.9 kJ/mol At 25 degrees C the rate constant is 0.0160 units s-1 units. At what temperature in degrees Celsius would this reaction go twice as fast? Given that the initial rate constant is 0.0160 s-1 at an initial temperature of ...
*January 30, 2013 by Amy*

**physics**

Two stones are thrown vertically up at the same time. The first stone is thrown with an initial velocity of 11.5 m/s from a 12th floor balcony of a building and hits hits the ground after 4.6 seconds. With what initial velocity should the second stone be thrown from a 4th ...
*September 10, 2013 by Logan*

**physics**

im stuck on the assignment: is the potential energy of a marble at the top of a ramp the same as the kinetic energy of the marble at the bottom of the ramp. I dont know the co-efficient of friction of wood but our teacher has told us keywords, they are: PREDICTIONS, measure ...
*March 27, 2008 by sinead*

**Physics**

Zero, a hypothetical planet, has a mass of 4.0 1023 kg, a radius of 3.0 106 m, and no atmosphere. A 14 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0 107 J, what will be its kinetic energy when ...
*July 24, 2010 by Terra*

**physics**

Zero, a hypothetical planet, has a mass of 5.7 x 1023 kg, a radius of 2.8 x 106 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0 x 107 J, what will be its kinetic energy ...
*March 28, 2011 by jr*