What is the kinetic energy of a 29 kg dog that is running at a speed of 7.9 m/s (about 18 mi/h)?

45,322 questions
1. physics

A racing dog is initially running at 20.0 , but is slowing down. Q1. How fast is the dog moving when its kinetic energy has been reduced by half? Q2. By what fraction has its kinetic energy been reduced when its speed has been reduced by half?

asked by nancy on March 18, 2011
2. physics

A racing dog is initially running at 15.0 m/s, but is slowing down.How fast is the dog moving when its kinetic energy has been reduced by half? By what fraction has its kinetic energy been reduced when its speed has been reduced by half?

asked by Andrea on July 18, 2010
3. physics

What is the kinetic energy of a 19 kg dog that is running at a speed of 7.4 m/s (about 17 mi/h)?

asked by jessie mcgee on August 31, 2010
4. science

What is the kinetic energy of a 23 kg dog that is running at a speed of 7.4 m/s (about 17 mi/h)?

asked by vanessa on February 4, 2012
5. physical science

What is the kinetic energy of a 27 kg dog that is running at a speed of 8.3 m/s (about 19 mi/h

asked by t on May 31, 2011
6. physics

What is the kinetic energy of a 20 kg dog that is running at a speed of 7.3 m/s (about 16 mi/h)?

asked by Shay on January 27, 2011
7. science

What is the kinetic energy of a 14 kg dog that is running at a speed of 9.0 m/s (about 20 mi/h)

asked by Renee on February 10, 2011
8. physics

What is the kinetic energy of a 26 kg dog that is running at a speed of 8.4 m/s (about 19 mi/h)?

asked by ashley on September 3, 2010
9. physics

What is the kinetic energy of a 15 kg dog that is running at a speed of 8.7 m/s (about 19 mi/h)?

asked by kim on September 17, 2016
10. physics

What is the kinetic energy of a 29 kg dog that is running at a speed of 7.9 m/s (about 18 mi/h)?

asked by chanelle on July 14, 2011
11. physics

What is the kinetic energy of a 15 kg dog that is running at a speed of 8.9 m/s (about 20 mi/h)?

asked by Anonymous on September 24, 2011
12. physics

What is the kinetic energy of a 19 kg dog that is running at a speed of 7.7 m/s (about 17 mi/h)?

asked by Anonymous on June 4, 2014
13. physical science

What is the kinetic energy of a 29 kg dog that is running at a speed of 8.8 m/s (about 20 mi/h)?

asked by Liz on September 9, 2012
14. Science

What is the kinetic energy of a 28 kg dog that is running at a speed of 7.0 m\s(about 16mi\h)?

asked by Ann on June 2, 2011
15. Physics

You are walking a dog when the dog sees a cat and runs away from you. You immediately run after the dog at 5.50 m/s. You jump at an angle of 29.0° to try and catch the dog. While you are in the air the dog is able to move an extra 1.34 m away from you. If

asked by AL on September 27, 2016
16. Physics

You are walking a dog when the dog sees a cat and runs away from you. You immediately run after the dog at 4.90 m/s. You jump at an angle of 30.0° to try and catch the dog. While you are in the air the dog is able to move an extra 1.72 m away from you. If

asked by Tom on September 24, 2016
17. Physics

You are walking a dog when the dog sees a cat and runs away from you. You immediately run after the dog at 4.20 m/s. You jump at an angle of 28.0° to try and catch the dog. While you are in the air the dog is able to move an extra 1.57 m away from you. If

asked by Brooklyn on September 24, 2016
18. physics

A racing dog is initially running at 20.0 m/s, but is slowing down. Question: How fast is the dog moving when its kinetic energy has been reduced by half? Question: By what fraction has its kinetic energy been reduced when its speed has been reduced by

asked by nancy on March 21, 2011
19. physics

a racing dog is initially running at 10.0 m/s, but is slowing down. (a) How fast is the dog moving when its kinetic energy has been reduced by half?

asked by sarah on October 25, 2009
20. Physical Science-Can someone check my answers?

1) The kinetic energy of an object depends on which of the following? A. the object’s mass and direction B. the object’s speed and mass---------- C. the object’s work and direction D. the object’s speed and work 2) In the following situations,

asked by dark1 on February 18, 2014
21. science

A running back has 3500 J of kinetic energy and is running at a speed of 8 m/s. Calculate his mass.

asked by steve on December 21, 2014
22. Physical Science

Can someone please check these answers for me? Write T for True or F for False for each statement: 1.Kinetic energy is the energy of motion - T 2.Kinetic energy doesn't depend on an object's direction. - T 3.When an object stops moving, its kinetic energy

asked by mysterychicken on April 20, 2009
23. Physics kinetic energy

Okay the equation for kinetic energy is = 1/2mv^2 so how would i figure this out?? If a semi-truck decreases its speed from 10 m/s to 5 m/s, its new Kinetic Energy is: a)4 times its old Kinetic Energy b)2 times its old Kinetic Energy c)1/2 its old Kinetic

asked by Aisumi on October 30, 2010
24. Physics

The particles as shown in the figure below are connected by a very light rod. They rotate about the y axis at 1.9 rad/s. a. Find the speed of each particle, and use it to calculate the kinetic energy of this system directly from 1/2 mivi2. speed of m1 = 1

25. physics

Calculate the kinetic energy of a 3-kg dog that runs at a speed of 4 m/s

asked by Tb on September 22, 2018
26. physics

A cat is being chased by a dog. Both are running in a straight line at constant speeds. The cat has a head start of 3.6 m. The dog is running with a speed of 8.9 m/s and catches the cat after 6.9 s. How fast did the cat run?

asked by Alexis on September 24, 2014
27. Physics

A dog running in the +y-direction at 6.6m/s hears its owner call from behind, and 3.0secs later it's running at the same speed in the opposite direction. Compute the dog's change in velocity. Compute its average acceleration.

asked by Tig on February 9, 2012
28. physics

A cat is being chased by a dog. Both are running in a straight line at constant speeds. The cat has a head start of 3.3 m. The dog is running with a speed of 9.0 m/s and catches the cat after 6.7 s. How fast did the cat run? I see that the velocity and

asked by angela on September 16, 2011
29. Physics

A dog running in the +y-direction at 6.0 hears its owner call from behind, and 2.7 later it's running at the same speed in the opposite direction. Calculate the dog's change in velocity. Calculate the average acceleration

asked by Marissa on October 12, 2012
30. physics

A merry-go-round is stationary. A dog is running on the ground just outside its circumference, moving with a constant angular speed of 0.705 rad/s. The dog does not change his pace when he sees what he has been looking for: a bone resting on the

asked by Anonymous on March 1, 2011
31. physics

what is the kinetic energy of a bear with a mass of 65 Kg and running at a speed of 20 m/s ?

asked by moxxi on March 3, 2011
32. just checking

My method was correct right?, sorry to post again I just wanted to double check that I had the setup right: A 8000N car is traveling 12 m/s along a horizntal road when the brakes are applied. The car skids to a stop in 4.0s. How much kinetic energy does

asked by Jenny on November 6, 2006
33. physics

A particle has a kinetic energy equal to its rest energy. (a) What is the speed of this particle? (b) If the kinetic energy of this particle is doubled, does its speed increase by more than, less than, or exactly a factor of 2? (c) Explain (d) Calculate

asked by martini on April 28, 2012
34. English

Read the following sentence: We should probably call the neighbors about that barking dog running through their yard. Which of the following correctly describes the verbal and its function in this sentence? Barking is a present participle describing the

35. Science

1. How do you calculate kinetic energy (what is the formula) 2. A 700-kg vehicle is traveling at a speed of 6 m/s. How much kinetic energy does it have? 3. Two rocks of different masses are rolling down a hill at the same speed. Which rock (small one or

asked by Khaliyl R Testman on November 2, 2018
36. Physics

A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity

asked by Jon on December 15, 2010
37. Physics

A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity

asked by Jon on December 15, 2010
38. Physics

Problem 1- A dog running in an open field has components of velocity vx = 2.2m/s and vy = -2.5m/s at time t1 = 12 s. For the time interval from t1 = 12 s to t2 = 24 s , the average acceleration of the dog has magnitude 0.55 m/s2 and direction 25.5∘

asked by Maryam on October 24, 2013
39. Physics

You are riding a merry-go-round on the rim which is turning counterclockwise at a constant angular speed of 0.5 rad/s.  Your dog sees you at the 12 o'clock position when he is at the 3 o'clock position.  He starts running counterclockwise from rest with

asked by Alphonse on October 26, 2012
40. Physics

Two objects are mocing about so that their total momentum is zero. What can be said about their kinetic energy? Choose the most descriptive answer. a. the kinetic energy must be greater than zero b. the kinetic energy must be negative c. the kinetic energy

asked by Paige on March 21, 2011
41. Physics

A rolling barrel with initial velocity 20 m/s encounters a hill 10m tall to slow it down 1. state where its angular speed is 0 2. state where its rotational kinetic energy will be 0 3. state where its translation kinetic energy will be 0 4. for each of the

asked by Michelle on May 2, 2014
42. physics

Hi: We have a homework problem that I have no idea even how to set up! please help! "A man jogs at a speed of 1.3 m/s. His dog waits 1.4s then takes off running at a speed of 2.8 m/s to catch the man. How far will they have to travel before the dog watches

asked by Ty on September 11, 2007
43. physics

Hi: We have a homework problem that I have no idea even how to set up! please help! "A man jogs at a speed of 1.3 m/s. His dog waits 1.4s then takes off running at a speed of 2.8 m/s to catch the man. How far will they have to travel before the dog watches

asked by Ty on September 9, 2007
44. Science

which of the following is true about kinetic energy select all that apply A as an objects speed increases kinetic energy decreases B only moving objects have kinetic energy ••• C kinetic energy increases as an objects height increases D kinetic

asked by Katie on May 13, 2017
45. Physics

You run a race with your friend. At first you each have the same kinetic energy, but then you find that she is beating you. When you increase your speed by 21.0%, you are running at the same speed she is. If your mass is 77.0 kg, what is her mass?

asked by Jake on February 10, 2013
46. Physics

A man jogs at a speed of 1.7 m/s. His dog waits 2.5 s and then takes oﬀ running at a speed of 4.1 m/s to catch the man. How far will they have each traveled when the dog catches up with the man? help me set up the equations please!

asked by Daisy on August 24, 2012
47. physics

A man jogs at a speed of 1.7 m/s. His dog waits 1.4 s and then takes off running at a speed of 3.4 m/s to catch the man. How far will they have each traveled when the dog catches up with the man? Answer in units of m

asked by Sonia on September 30, 2012
48. physics

A man jogs at a speed of 1.7 m/s. His dog waits 1.9 s and then takes off running at a speed of 2.7 m/s to catch the man. How far will they have each traveled when the dog catches up with the man? Answer in units of m

asked by gera on January 23, 2013
49. science

A running man has half the kinetic energy of that of a boy of half of his mass. The man speed up by 1 m/s so as to have same kinetic energy as that of boy . The original speed of man is ?

asked by vijay on September 22, 2012
50. Differential Equations

A rabbit starts at the origin and runs up the right branch of the parabola y=x^2 with speed a. At the same time a dog, running with speed b, starts at the point (c,0) and pursues the rabbit. Write a differential equation for the path of the dog

asked by Samantha on January 26, 2012
51. physics sl

A dead dog of mass 2.2 kg and an initial speed of 5.5 m.s-1 slides along a rough horizontal surface and stops after travelling 4.2 m. calculate the frictional force between the dog and the surface (Think of the work the friction has to do to stop the dog

asked by samuel on October 4, 2015
52. physics

A 6kg cat is running across a table which is 1.2 m tall. The kinetic energy of the cat is 48 j. A) how fast is the cat running? B) what is the potential energy of the cat? C) what is the total mechanical energy of the cat?

asked by Shelby on February 20, 2012
53. physics

A 6kg cat is running across a table which is 1.2 m tall. The kinetic energy of the cat is 48 j. A) how fast is the cat running? B) what is the potential energy of the cat? C) what is the total mechanical energy of the cat?

asked by Shelby on February 20, 2012
54. physics (mechanics)

A running man has half the kinetic energy of a boy half his mass. The man speeds up by 1.30 m/s and then has the same kinetic energy as the boy. What is the speed (in meters/second) of the boy?

asked by andrew on April 12, 2012
55. physics

4. Two masses of 3 kg and 5 kg collide head-on, the former moving to the right with the speed 5 m/s and the latter moving to the left with the speed 3 m/s.After collision they stick together. What amount of mechanical energy is lost? 5. A cylinder with a

asked by ray on May 24, 2010
56. physics

A boulder flies through the air at 14.5 m/s with kinetic energy 310 J. What's its mass? What's the boulder's kinetic energy if its speed doubles? What's the boulder's kinetic energy if its speed is halved?

asked by leon on February 9, 2016
57. physics

a dog runs back and forth between its two owners, who are walking toward one another. the dog starts running when the owners are 10 m apart. if the dog runs with a speed of 3 m/s and the owners each walk with a speed of 1.3 m/s how far has the dog traveled

asked by manny on August 26, 2007
58. Physics

A pitcher claims he can throw a 0.157 kg baseball with as much momentum as a 1.5 g bullet moving with a speed of 1.50 multiplied by 103 m/s. (a) What must the baseball's speed be if the pitcher's claim is valid? m/s (b) Which has greater kinetic energy,

asked by matt on November 6, 2010
59. Physics

_________________________________________________________________ You find yourself on your bike at the top of Twin Peaks in San Francisco. You are facing a 600m descent. You and your bike weigh a combined 85 kg. 1. How much gravitational potential energy

asked by V on December 14, 2015
60. physical

A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s².)

asked by chelsea on February 26, 2013
61. science

a small dog is train to jump straight up a distance of 1.2m. how much kinetic energy does the 7.2-kg dog need to jump this high ( the acceleration due to gravity is 9.8m/s2

asked by keisha on July 20, 2013
62. Physics URGENT!!!

A 91.0 kg fullback running east with a speed of 6.00 m/s is tackled by a 73.0 kg opponent running north with a speed of 3.00 m/s. Where did the lost energy go?

asked by Anonymous on October 17, 2012
63. Physics

When a skydiver jumps from a plane and achieves terminal speed. Which quantity remains constant? (a) Momentum (b) kinetic energy (c) potential energy (d) both a and b (e) both a and c I say kinetic energy, am i right?

asked by James on April 4, 2009
64. science

A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s2.) Show your work.

asked by Anonymous on January 10, 2013
65. physics

A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s2.) Show your work.

asked by MiyaW on March 14, 2012
66. physics

A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass M=100kg) that can convert 25% of the rotational kinetic energy into translational kinetic energy. The mass of the car is 1000kg ( including flywheel). Suppose the car is at rest, and

asked by Al on December 30, 2013
67. physics

A canon of mass 1100kg fires a cannonball of mass 6.2kg at a speed of 190ms-1. a) Calculate the initial recoil speed of the cannon. b)The purpose of the firing the canon is to transfer chemical energy of the explosive into kinetic energy of the cannon

asked by jothegreat on January 13, 2018
68. physics

A 20.0-kg model plane flies horizontally at a constant speed of 12.2 m/s. (a) Calculate its kinetic energy. . J (b) The plane goes into a dive and levels off 20.0 m closer to Earth. How much potential energy does it lose during the dive? Assume no

asked by Brianna on May 11, 2012
69. physics

A sprinter has a mass of 82.0 kg. If the sprinter is running at a speed of 22.5 km/h, determine his kinetic energy. __________ × 103 J.

asked by help on July 31, 2014
70. physics

A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s2.) Show your work for credit.

asked by sophia on February 5, 2017
71. Science

17. A small dog is trained to jump straight up a distance of 1.1 m. How much kinetic energy does the 7.7-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s2.) Show your work. (3 points)

asked by Anonymous on March 10, 2011
72. Science

A golf ball and a ping-pong ball are dropped in a vacuum chamber. When they have fallen halfway down, they have the same... A.speed B.potential energy C.kinetic energy D.Rest Energy my thought is that its c, kinetic energy...but i'm not 100% sure

asked by Tammy on January 23, 2007
73. Physics

A 245 g particle is released from rest at point A inside a smooth hemispherical bowl of radius 35.0 cm, as shown in Figure 5-21. (a) Calculate the gravitational potential energy at A relative to B. 1 . (b) Calculate the particle's kinetic energy at B. 2

asked by Brooks on October 20, 2011
74. Physics

Human feet and legs store elastic energy when walking or running. They are not nearly as efficient at doing so as kangaroo legs, but the effect is significant nonetheless. If not for the storage of elastic energy, a 70.0-kg man running at 4.00 m/s would

asked by Shannon on September 30, 2014
75. physics

A man jogs at a spee of 1.1 m/s. His dog waits 1.6s and then takes off running at a speed of 3.8 m/s to catch up with the man. How far will they each have traveled when the dog catches up with the man?Answer in units of m

asked by ashley on June 11, 2011
76. Physics

If a dog chases its tail in a perfect circle of radius r at constant speed v, which of the following is true? A. The dog's acceleration is zero. B. The dog's velocity is constant. C. The sum of the forces, F , acting on the dog is zero. D. The time it

asked by Lyon on September 24, 2016
77. Physics ~Conservation of Energy~ part 2

1.) A 500 kg roller coaster is pulled to the top of a hill 45 m high and arrives at the top with a zero speed. a) how much work has done by the vhain to pull the car to the top? b) how much potential energy does it have at the top? c)What is the total

asked by Isis on January 30, 2013
78. Science

1. A student lifts his 2.0-kg pet rock 2.8m straight up. He then lets it drop to the ground. Use the Law of Conservation of Energy to calculate how fast the rock will be moving ..... a. half way down b. just before it hits the ground 2. A 65-kg girl is

asked by Hershey on November 19, 2014
79. Physics

1. A student lifts his 2.0-kg pet rock 2.8m straight up. He then lets it drop to the ground. Use the Law of Conservation of Energy to calculate how fast the rock will be moving ..... a. half way down b. just before it hits the ground 2. A 65-kg girl is

asked by Hershey on November 21, 2014
80. Physics-science

A football player weighing 75 kg running at 2 m/s toward west tackles a 70 kg player running 1.5 m/s in the opposite direction. What is the decrease in kinetic energy during the collision?

asked by Daryl on December 7, 2012

An object A has half the mass and twice the velocity of object B. How are the kinetic energies of A and B related? A. The kinetic energy of B is 4 times that of A. B. The kinetic energy of B is twice that of A. C. The kinetic energy of A is the same as

asked by Morgan on November 17, 2014
82. Math

the kinetic energy of moving body ids directly praportional to its mass and the square of its speed.if the mass of a bullet is halved by what factor must its speed be increased to have the same kinetic energy as before?

asked by rahul patel on November 21, 2011

A hand gun fires a 12.0 g bullet at a speed of 400 m/s. What is its kinetic energy? At what speed must a motorcycle of mass 173 kg move to have the same kinetic energy as the bullet? Express your answer in km/h.

asked by Joeline on May 22, 2013
84. Algebra II

The kinetic energy of a moving body is directly proportional to its mass and the square of its speed. If the mass of a bullet is halved, by what factor must its speed be increased to have the same kinetic energy as before?

asked by Arielle on November 21, 2011
85. Algebra II

The kinetic energy of a moving body is directly proportional to its mass and the square of its speed. If the mass of a bullet is halved, by what factor must its speed be increased to have the same kinetic energy as before?

asked by Joe on November 21, 2011
86. Algebra II

The kinetic energy of a moving body is directly proportional to its mass and the square of its speed. If the mass of a bullet is halved, by what factor must its speed be increased to have the same kinetic energy as before?

asked by Ashley on November 22, 2011
87. Physics

Jenn Suhr recently won the gold medal in this summer’s Olympic games in pole vault. Her record is 16 ft, 2 in. (She did less than that to win gold this summer.) If all of her gravitational potential energy came only from her kinetic energy, calculate (in

88. physics

A 2.10-g particle is released from rest at point A on the inside of a smooth hemispherical bowl of radius R = 28.0 cm. Calculate the following: (a) Its gravitational potential energy at A relative to J (b) Its kinetic energy at B. J (c) Its speed at B. m/s

asked by nicole on June 8, 2010
89. physics

A stone is thrown vertically upward. On its way up it passes point A with speed, v and point B, 3 m higher than A, with speed 1/2v. Calculate a) the speed v and b) the max height reached by the stone above point B. I can't find the equation You need to

asked by jenny on September 17, 2006
90. physics

Question Part Submissions Used A 11.5-kg cylinder rolls without slipping on a rough surface. At an instant when its center of gravity has a speed of 10.9 m/s, determine the following. (a) the translational kinetic energy of its center of gravity J (b) the

asked by joanna on April 2, 2016
91. Physics

A 5.36 kg object falls freely (ignore air resistance), after being dropped from rest. Determine the initial kinetic energy, the final kinetic energy, and the change in kinetic energy for the following. (a) first meter of fall initial kinetic energy 0 J

asked by George on March 8, 2014
92. physics

A 9.90-g bullet has a speed of 1.33 km/s. (a) What is its kinetic energy in joules? (b) What is the bullet's kinetic energy if its speed is halved? (c) What is the bullet's kinetic energy if its speed is doubled?

asked by Jonathan on November 10, 2011
93. physics

A 9.90-g bullet has a speed of 1.33 km/s. (a) What is its kinetic energy in joules? (b) What is the bullet's kinetic energy if its speed is halved? (c) What is the bullet's kinetic energy if its speed is doubled?

asked by Jonathan on November 10, 2011

A 10.0 kg cylinder rolls without slipping on a rough surface. At an instant when its center of gravity has a speed of 16.0 m/s, determine (a) the translational kinetic energy of its center of gravity.(b) the rotational kinetic energy about its center of

asked by Sarah on November 6, 2012
95. Science

2.)A car driver accelerates to a speed of 35 mph and then takes her foot of the gas pedal.Even though she does not press the brake pedal at any time,she eventually rolls to a stop.which of the following most likely causes the car to come to a stop?

asked by #FreeGucci on April 11, 2016
96. physics

suppose an automobile has a kinetic energy of 2900J. when it moves with 3 times the speed, what will be its kinetic energy? answer in the units of joules

asked by Emily on October 28, 2012
97. science

A ball sitting on the top of a table has potential energy but no kinetic energy. How do potential and kinetic energy change as the ball falls off the table to the floor? A. Both its potential energy and its kinetic energy decrease. B. Both its potential

asked by Sabina on February 23, 2015
98. science

A ball sitting on the top of a table has potential energy but no kinetic energy. How do potential and kinetic energy change as the ball falls off the table to the floor? A. Its potential energy increases, and its kinetic energy decreases. B. Its potential

asked by Aspen on February 18, 2015
99. Physics

Determine the ratio of the relativistic kinetic energy to the nonrelativistic kinetic energy (1/2mv2) when a particle has a speed of (a) 2.12 x 10-3c. and (b) 0.959c.

asked by Beth on July 20, 2012
100. Physics

Determine the ratio of the relativistic kinetic energy to the nonrelativistic kinetic energy (1/2mv2) when a particle has a speed of (a) 2.60 × 10-3c. and (b) 0.972c

asked by Ellie on September 30, 2016