# 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, page 285
1. ## physics

(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 10.5 m/s when going down a slope for 3.18 s? (b) How far does the skier travel in this time?

asked by sarah on August 7, 2015
2. ## physics

The 20kg object is dropped from a height of 2 meters. Find its speed when it hits the ground. Give your answer in meters per second.

asked by Darcie on February 26, 2012
3. ## earth

A satellite has a mass of 5.98*10^24 kg.if this satellite is t be placed into a circular orbit 300km above the earths surface,what speed,period and radial acceleration must it have

asked by busi on August 13, 2012
4. ## Physics

a car leaves skid marks 84 m long on the highway. Assuming a deceleration of 7.50 m/s2, estimate the speed of the car just before braking.

asked by Shay on September 19, 2011
5. ## pyhsis

A man walks half of his trip by 40km/hr and ride a bicycle the rest of his trip by 60km/hr. What is his average speed

asked by susu holic on November 22, 2013
6. ## physics

A freight train has a mass of 1.5 x 10^7 kg . If the locomotive can exert a constant pull of 7.5 X 10^5 N, how long does it take to increase the speed of the train from rest to 80 km /h?

asked by tionne on November 13, 2012
7. ## physics

An object moves in a straight line at a constant speed. Is it true that here must be no forces of any kind acting on this object? Explain.

asked by sea lively on October 20, 2018
8. ## algebra

an airplane flies with a constant speed of 500 miles per hour. How long will it take to travel a distance of 1000 miles?

asked by brea on December 22, 2014
9. ## physics

car moving on a straight road covers a distance of 1.5 km due east in 150 second.what is the speed of the car?what is it's velocity?

asked by rahul on June 1, 2015
10. ## physics

A diving bell is lowered into the sea at a speed of 6m/s and comes to rest with uniform retardation at a distance of 20m below the surface. What is it's retardation?

asked by Anonymous on May 1, 2013
11. ## Physics

An electron has an initial speed of 4.00×106 m/s. What potential difference (sign and magnitude) is required to bring the electron to rest?

asked by Rachel on October 19, 2015
12. ## Physics

What is the maximum height above ground a projectile of mass 0.67 kg, launched from ground level, can achieve if you are able to give it an initial speed of 78.5 m/s?

asked by John on January 27, 2015
13. ## physics

a ball rolls off the table top 2m tall. with a velocity of 10m/s. with what speed will it strike the ground? A. 10m/s B. 6.3m/s C. 16.3m/s D. 11.8m/s E. 139m/s

asked by Jacob on January 4, 2015
14. ## physics

. A sonar signal is sent from a ship and the signal returns from the bottom 3.65 s later. How deep is the ocean if the speed of sound in water is 1,530 m/s?

asked by Benji on April 3, 2014
15. ## physics

a stone of mass 50g is being rotated in a circle of radius 50cm with a uniform speed of 2m/s.what is thje accelerationof the stone?

asked by sunil on April 29, 2013
16. ## physics

a stone of mass 50g is being rotated in a circle of radius 50cm with a uniform speed of 2m/s.what is thje accelerationof the stone?

asked by sunil on April 29, 2013
17. ## physics

A 70 kg person is riding on a frictionless skateboard at 5 m/s. A friend facing him throws a 5 kg ball toward him at 20 m/s. What is his final speed after catching the ball?

asked by Kareem on January 6, 2015
18. ## Physics

Wind is blowing toward south at 8m/s, a runner jogs west at 7 m/s. What is the velocity (speed and direction) of the air relative to the runner?

asked by Curtis on February 2, 2014
19. ## physics

A football is kicked from the ground with a speed of 23m/s at an angle of 42 degrees above the horizontal a) how long is the football in the air b) how far does it travel

asked by mathew on January 14, 2015
20. ## math

a 0.02kg arrow hits the target at a speed of 2000m/s 5 seconds after it leaves the bow. With what force does it hit the target? can you help me do this

asked by j cook on November 9, 2009
21. ## algebra

an airplane flies with a constant speed of 500 miles per hour. How long will it take to travel a distance of 1500 miles

asked by brea on December 22, 2014
22. ## math

What is;the average speed in miles per hour for a plane that was :filled with 13 quarts of oil that flies a distance of 3,300 miles

asked by Anonymous on February 14, 2014
23. ## physics

A glacier moves with a speed of 45 nm/s. How many years would it take for the glacier to move 0.87 km? Assume there are 365 days in a year. Answer in units of y

asked by maria on September 27, 2012
24. ## Calculus

The position of a function of a moving particle is s(t)=5+4t-t^2 for 0

asked by Rachel on February 13, 2014
25. ## physics

a rock is dropped from a high brige.at the end of 3 seconds of free fall the speed of the rock is:[in centimeters per second,g=10 m/second square]

asked by komal on December 30, 2014
26. ## physics

You fire a cannon ball from ground level at a speed of 20.0 m/s ∠30.0 Find the time taken for the ball to hit the earth. How far will it land?

asked by axel on January 29, 2015
27. ## Physics

Initially sliding with a speed of 2.5 m/s, a 2.0 kg block collides with a spring and compresses it 0.35 m before coming to rest. What is the force constant of the spring?

asked by Caleb on December 30, 2014
28. ## physics

(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 8.02 m/s when going down a slope for 4.28 s? (b) How far does the skier travel in this time?

asked by justin on July 25, 2013
29. ## Physics

A 200N force acts on a 30kg mass on a horizontal surface against 50N of friction. What is the speed of the mass after 5 seconds?

asked by Teah on October 18, 2010
30. ## science

12-83. Determine the maximum height on the wall to which the firefighter can project water from the hose, if the speed of the water at the nozzle is 48ft/s

asked by aaa on September 30, 2013
31. ## Physics 20

A 90.3 cm long pendulum is released from a vertical height of 20 cm and is allowed to swing freely. Determine the greatest speed of the pendulum.

asked by Anonymous on February 21, 2016
32. ## physics

Karen shouts across a canyon and hears an echo 3.1 s later. How wide is the canyon? The speed of sound is 343 m/s. Answer in units of m

asked by Lilli on September 5, 2011
33. ## physics

A hunter aims horizontally at a target 120 m away. If the bullet travels the gun at a speed of 250 m/s, by how much will it miss the target?

asked by katelyn on October 12, 2010
34. ## physics

A 9536kg boxcar traveling at 6.8m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 5.576m/s. What is the mass of the second car?

asked by Anonymous on June 4, 2018
35. ## physics

A river has a steady speed of 0.470 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point

asked by Bishop's High on June 11, 2015
36. ## Physics

Using T-charts A marble it dropped from a stair well that is 4.3 m high. (a) How long will the marble be in the air for? (b) What speed will it be traveling at as it hits the ground?

asked by Sammy on September 24, 2012
37. ## Physics

What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 5.8 m/s when going down a slope for 2.8 s? How far does the skier travel in this time?

asked by KJ on September 7, 2011
38. ## Physics

Five pulses are generated every 0.094 s in a tank of water. What is the speed of propagation of the wave if the wavelength of the surface wave is 1.14 cm? can you break it down please.

asked by Tiara on January 5, 2011
39. ## Physics

An airplane must reach a speed of 240.5 mi/h in order to take off. If the runway is 571.5 m long, what is the minimum value of the acceleration that will allow the airplane to take off successfully?

asked by Anon14 on September 10, 2011
40. ## physics

A net force of 25N is applied for 5.7s to a 12-kg box initially at rest. Waht is the speed of the box at the end of the 5.7s interval?

asked by Natasha on February 18, 2012
41. ## physics

two rock are thrown off the edge of a cliff one is thrown horizont at a speed of 25 m s the other dropped straight down. which stone will hit the ground first? why?

asked by Anonymous on September 24, 2012
42. ## math

a plane is steering at S83degE at an air speed of 550 km/h. The wind is from N70degE at 85 km/h. Find the ground velocity of the plane to 1 d.p.

asked by carol on June 10, 2018
43. ## science

Betty is sledding down a hill going 12 m/s. She hits a very steep patch and starts to speed up 1.5 m/s2. How fast will Betty be moving 2 seconds later?

asked by Megan on October 25, 2012
44. ## Physics

The cannonball is fired at a speed of 45 and an angle of 35 . A cannonball that was accidentally dropped from the top of the castle wall hit the moat below in 1.8 .

asked by jeff on April 20, 2013
45. ## algebra d=rt word problem

A car travels from one town to another at a speed of 32 mph. If it had gone 4 mph faster, it could have made the trip in 1/2 hour less time. How far apart are the towns.

asked by mark on February 26, 2009
46. ## Physics

A spring whose spring constant is 650 N/m is compressed 0.600 m. What speed (in meters/second) can it give to a 0.100 kg ball when released

asked by Lauren on July 2, 2012
47. ## Transistion to College Math

A rifle bullet is fired vertically with initial speed 490 m/s. how long does it take the bullet to reach its greatest height?

asked by Mike on March 28, 2012
48. ## physics

An excellent golfer can provide an impulse of nearly 2 kg m/sec impulse to a 0.045 kg ball. What momentum and speed result from such a hit?

asked by Rene M on December 12, 2011
49. ## Physics

An FM radio station broadcasts electromagnetic waves at a frequency of 1.08 × 10§ hertz. The speed of these waves is 3.0 × 10§ meters/second. Find the wavelength.

asked by Dave on July 5, 2012
50. ## physics

A hunter aims horizontally at a target 120 m away. If the bullet leaves the gun at a speed of 250 m/s, by how much will it miss the target?

asked by katelyn on October 10, 2010
51. ## science- sound class 9th

aditi clapped her hands near a cliff and heard the echo after 4 seconds. what is the distance of cliff from her if the speed of sound is taken as 346ms-1

asked by manisha on January 10, 2017
52. ## physics

`A golfer strikes the ball as shown. Letting, α = 23 °, β = 41°, and the initial speed v0 = 6 m/s, determine the x and y coordinates of the place where the ball will land

asked by Anonymous on February 9, 2013
53. ## Physics

A freight train has a mass of 1.0 10^7 kg. If the locomotive can exert a constant pull of 7.5 10^5 N, how long does it take to increase the speed of the train from rest to 66 km/h?

asked by Ozy on September 9, 2011
54. ## Physics

A car is traveling a road that makes quarter of a circle with a constant speed. What is the magnitude of the average velocity of the car?

asked by Jasalle on March 1, 2011
55. ## physics

a pipe carrying 20degrees of water has a diameter 2.5cm.Estimate the maximum flow speed if the flow must be streamline?

asked by stylish on February 23, 2018
56. ## Physics

What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 8.0 m/s when going down a slope for 5.0 s? How far does the skier travel in this time?

asked by Sara on December 19, 2008
57. ## Science

a 30 gm bullet is fired from a gun of mass 2kg with a speed of 800m/s. Find the magnitude and direction of the velocity of gun

asked by Anonymous on January 19, 2017
58. ## Physics

A skier is gliding along at 7.49 m/s on horizontal, frictionless snow. He suddenly starts down a 14.4° incline. His speed at the bottom is 28.5 m/s. What is the length of the incline?

asked by Bala on October 4, 2010
59. ## physics

A 0.105-kg hockey puck moving at 26 m/s is caught and held by a 72-kg goalie at rest. With what speed does the goalie slide on the ice?

asked by cassie on December 17, 2010
60. ## Maths

An air craft executes horizental loop at a speed of 720km/hr with its wings banked 30degree what is the radius of loop

asked by Ayan on September 23, 2018
61. ## Genetic

I need to write a proposal of the possible traits we can actually measure in lab. What are some quantatitive traits of woodlice/isopod beside measuring their maximum speed.

asked by Jake on November 13, 2007
62. ## Physics blehhhh

A 0.35 m2 coil with 50 turns produces a maximum emf of 45 volts in a magnetic field of 0.4 Tesla. What is the speed of rotation of the coil?

asked by anonymous on January 27, 2013
63. ## Math

The speed of a Garden snail is 50 meters per hour and that of the Cheetah is 120 kilometers per hour. Find the ratio of the speeds.

asked by Anonymous on December 17, 2016
64. ## physics

A 530 cannon fires a 12 cannonball with a speed of 200 relative to the muzzle. The cannon is on wheels that roll without friction.

asked by Anonymous on November 30, 2011
65. ## Physics

A skier is gliding along at 7.49 m/s on horizontal, frictionless snow. He suddenly starts down a 14.4° incline. His speed at the bottom is 28.5 m/s. What is the length of the incline?

asked by Bala on October 4, 2010

A tire with a diameter of 100 cm rotates 20 times in 3 seconds. a) determine the angular velocity b) how far the tire has travelled? c) what is the speed in km/h?

asked by linda on November 29, 2011
67. ## Physics

A skier is gliding along at 7.49 m/s on horizontal, frictionless snow. He suddenly starts down a 14.4° incline. His speed at the bottom is 28.5 m/s. What is the length of the incline?

asked by Bala on October 4, 2010
68. ## math

if you walk around the earths equator with an average speed of 5 miles per hour how many days would you need to walk to come back to your starting point

asked by Anonymous on October 25, 2015
69. ## Physics

Initially sliding with a speed of 2.1 m/s, a 2.1 kg block collides with a spring and compresses it 0.35 m before coming to rest. What is the force constant of the spring?

asked by Helen Batt on March 13, 2010
70. ## Math

If a 3/8" drill bit is rotating clockwise at 1300 RPM and the bit shatters, at what speed will the projectile be traveling outward?

asked by Troy on August 1, 2012
71. ## physics

Hi, i really need help with this question. Two identical cars hit each other and lock bumpers. A car moving with a speed of 90 km/h approaches a stationary car

asked by Axel on November 17, 2009
72. ## physics

A motorcycle stunt driver zooms off the end of a cliff at a speed of 30 meters per second. If he lands after 0.75 seconds, what is the height of the cliff?

asked by Anonymous on January 29, 2014
73. ## physic

A student throws a ball vertically upward such that it travels 6.8m to its maximum height. What is the average speed? What is the average velocity?

asked by bety on January 29, 2014
74. ## trigonometry

Two trains leaves the same station at 9:30 am and travel in a straight lines at speed of 54 mph and 75 mph,respectively. If the difference in their directions is 136°, how far apart are they at 6:30 pm?

asked by ymme on March 6, 2016
75. ## physics

the distance between 2 towns T1 and T2 is 400km. two cars A and B start simultaneously from T1 and T2 towards each other. the speed of A is 60km/h and that of B is 40km/h the point where two cars will meet is at?

asked by pappu on July 21, 2017
76. ## physics

A plane heads south at 320 mph and the wind is west at 80 m/s. What is the final speed and angle degree of the plane?

asked by Anonymous on August 30, 2011
77. ## physics

If a bomber travels horizontally at a speed of 250 km/hr and at a height of 5000 m how far away (measured horizontally) from the target must a bomb be released?

asked by Elise on December 19, 2010
78. ## Physics

A skier is gliding along at 6.24 m/s on horizontal, frictionless snow. He suddenly starts down a 19.9° incline. His speed at the bottom is 23.3 m/s. What is the length of the incline?

asked by Anonymous on October 5, 2010
79. ## Chemistry

What is the wavelength of a proton traveling at a speed of 6.21 km/s? What would be the region of the spectrum for electromagnetic radiation of this wavelength. For this one I did the same thing 6.63 X 10^-34/ (? kg)(6210 m/s) = How do get the kg for the

asked by Lauren on November 3, 2007
80. ## physics

A car accelerates uniformly in a straight line from rest at the rate of 3.9 m/s2 . What is the speed of the car after it has traveled 56 m? Answer in units of m/s.

asked by haven on September 19, 2016
81. ## physics

A 2.0 kg mass is moving on a frictionless airtrack. It collides into a motionless 1.5 kg mass. What is the combined speed of the two masses if they stick together on impact?

asked by Anonymous on January 29, 2013
82. ## science

a lead bullet at 100C strikes a steel plate and melts. what was its maximum speed? the specific heat of lead is 0.13 kJ/kg C

asked by Anonymous on September 21, 2012
83. ## science

whats the word for these 2 defenitions hear it goes if you know your speed and the time you traveled you can find the?ok now the second question how far something travels in a certain amount of time .

asked by joseline on November 12, 2009
84. ## physics

a particle is travelling in a straight line with constant acceleration.it covers 6m in the fourth second and 7m in the fifth second.find its acceleration and initial speed.

asked by Fatima on February 13, 2013
85. ## AP Physics

The surface of the sun has a temperature of about 6.0 103 K. This hot gas contains hydrogen atoms (m = 1.67 10-27 kg). Find the rms speed of these atoms.

asked by Kieran on December 20, 2010
86. ## Physic

What is the maximum height above ground a projectile of mass 0.67 kg, launched from ground level, can achieve if you are able to give it an initial speed of 78.5 m/s?

asked by Anonymous on January 29, 2015
87. ## physics

the equation of transverse wave on a rope is y(x,t)=5sin(4.0t-0.02x) where (y) and(x) are measured in cm and (t) in second.calculate the maximum speed of particle on the rope

asked by ashley on February 13, 2012
88. ## Math

Charles is going camping with his family their campsite is 5/8 mile away they walk a steady speed of 1 7/8 miles per hour how many minutes will it take them to get to the campsite?

asked by Myra on March 1, 2016
89. ## Physics

A car accelerates uniformly in a straight line from rest at the rate of 3.6 m/s2 . What is the speed of the car after it has traveled 61 m? Answer in units of m/s

asked by Ari on September 20, 2016
90. ## math

A bus takes 195 minutes to travel a distance of (2x + 30) km at an average speed of (x – 20) km/h. Calculate the actual distance traveled.

asked by kudu on February 2, 2015
91. ## Physics

A bike goes around a circular track of diameter 21500 cm in 10 min. Find its speed? please answer fast i want this answer tomorrow.

asked by Anupam khatiwara on July 29, 2012
92. ## physics

An apple falls from a tree and hits the ground 9.93 m below. With what speed will it hit the ground? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s

asked by argelia on September 19, 2012
93. ## Physics

A steel piano wire, of length 1.0 m and mass 4.4 g is stretched under a tension of 650.0 N. What is the speed of transverse waves on the wire?

asked by Maegan on May 6, 2013
94. ## Physics

A steel piano wire, of length 1.0 m and mass 4.4 g is stretched under a tension of 650.0 N. What is the speed of transverse waves on the wire?

asked by Maegan on May 6, 2013
95. ## Physics

A skier is gliding along at 7.49 m/s on horizontal, frictionless snow. He suddenly starts down a 14.4° incline. His speed at the bottom is 28.5 m/s. What is the length of the incline?

asked by Bala on October 5, 2010
96. ## Physics

A skier is gliding along at 7.49 m/s on horizontal, frictionless snow. He suddenly starts down a 14.4° incline. His speed at the bottom is 28.5 m/s. What is the length of the incline?

asked by Bala on October 5, 2010
97. ## Math

If you would walk around the earths Equator with an average speed of 5 miles per hour, how many days would you need to walk to come back to your starting point?

asked by Scott on October 21, 2015
98. ## Physics

Two waves travel in the same medium at the same speed. One has wavelength 0.0382 m and frequency 9.67×106 Hz. The other has wavelength 0.0486 m. What is the period of the second wave?

asked by Jamie on June 18, 2012
99. ## Physics

At a track and field meet, the best long jump is measured as 8.30 m. The jumper took off at an angle of 31 ° to the horizontal. What was the jumper’s initial speed?

asked by Bex on September 21, 2016
100. ## algebra

an airplane flies with a constant speed of 500 miles per hour. How long will it take to travel a distance of 1000 miles?

asked by brea on December 21, 2014