# 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 296
1. ## Physics

If you can throw a stone straight up to a height of 18m, how far could you throw it horizontally over level ground? Assume the same throwing speed and optimum launch angle.

asked by John on February 5, 2014
2. ## physics

A flat (unbanked) curve on a highway has a radius of 230.0 . A car rounds the curve at a speed of 28.0 .What is the minimum coefficient of friction that will prevent sliding?

asked by Anonymous on March 20, 2011
3. ## Physics

A skateboarder with an initial speed of 3.1-m/s, rolls virtually friction free down a straight incline of length 18-m in 3.2-s. At what angle (in degrees) is the incline oriented above the horizontal?

asked by james on September 15, 2017
4. ## physics

The coefficient of friction between the block of mass m1 = 3.00 kg and the surface in the figure below is ìk = 0.365. The system starts from rest. What is the speed of the ball of mass m2 = 5.00 kg when it has fallen a distance h = 1.90 m?

asked by zamdirhy on April 19, 2012
5. ## Physics

A skateboarder, with an initial speed of 2.4m/s , rolls virtually friction free down a straight incline of length 19m in 3.3 s.At what angle θ is the incline oriented above the horizontal?

asked by Saku on September 26, 2014
6. ## Dynamics

The acceleration of a particle which moves along the x axis is given by a=4x+5x^(3/2) The particle has speed of 2m/s when x=1m x is in meters a is in m/s^2 evaluate the velocity when x = 8m I know that I need to use kinematic eqn 3 adr = vdv then take the

asked by elaine on January 12, 2015
7. ## dynamics

a boy weighs 80 lb and is hanging uniformly from a bar, how do you find the force in each of his arms at t=2s if the bar is moving upward with a.)constant velocity of 3ft/s, b.) a speed of (4t^2) ft/s?

asked by sarah on November 9, 2008
8. ## college physics

A 52.2 kg parachutist lands moving straight downward with a speed of 3.75 m/s. If the parachutist comes to rest with constant acceleration over a distance of 0.794 m, what force does the ground exert on her?

asked by sam on September 22, 2014
9. ## Physics

A golf ball having an initial speed of 50m/s with an angle of 30 degree what is time of flight and range and velocity it which it hits the ground at the end of flight

asked by Sachin on August 8, 2018
10. ## physics

A 0.50 kg ball that is tied to the end of a 1.4 m light cord is revolved in a horizontal plane with the cord making a 30° angle with the vertical. determine the balls speed.

asked by kaitlyn on December 6, 2010
11. ## physics

A 2.5m long pole is balanced vertically on it's tip. If it falls over with it's bottom never slipping. Find the speed of the top end of the pole just before it hits the ground.

asked by ashley on November 30, 2012
12. ## motion problem

A man rowed 30km downstream. it took him 2hrs more time in going back than in going downstream. if the current is 2kph, what is his speed in still water? (with solution pls... tnx)

asked by MNHS MNHS on November 12, 2013
13. ## physics

A 726 kg car travels from Boone to Blowing Rock along US321. How much working is needed to keep the car traveling at a constant speed of 21.8 m/s around a curve of radius 28.4 m?

asked by KC on December 5, 2010
14. ## Physics

An object is freed from the top of the tower at an altitude of 39.2m. At the same time, another substance is thrown at an initial speed of 19.6 m per sec. At what time both the objects and the height of the cave get?

asked by Krinal on July 14, 2018
15. ## Physics

a mass of 100kg moves in a circular path of radius of 5cm with uniform speed of 20m/s.find the centripetal acceleration and centripetal force.

asked by Emmanuel Chinda on July 9, 2018
16. ## physics

a 1710 kg passes over a hill that follows the arc of a circle of radius 41.5 meters. what is the maximum speed the car can have passing this point so the car does not leave the road

asked by cooldud on February 4, 2014
17. ## physics

AT exactly noon,you pass mile marker 50 in your car.At 2:30pm you pull into a rest stop at mile marker215.What was yor average speed during this time

asked by rally on September 2, 2011
18. ## physics

A rifle is fired horizontally and travels 200.0 m The rifle barrel is 1.90m from the ground. What speed must the bullet have been traveling at? Ignore friction. How do I solve this ?

asked by anonymous on November 30, 2010
19. ## physics

An aircraft has a lift off speed of 130 km/h. What minimum uniform acceleration does this require if the aircraft is to be airborne after a takeoff run of 350 m? Answer in units of m/s2

asked by Mark on January 29, 2015
20. ## Physics

A stone is thrown vertically upward at an initial speed of 10m/s. Find the total time of the flight and the maximum height reached by the stone.

asked by Jane on February 8, 2016
21. ## Physics

If a basketball player has a vertical leap of 1.29 m , then what is his takeoff speed and his hang time ( total time to move upwards to the peak and then return to the ground ) ?

asked by Chloe on September 9, 2016
22. ## PHYSICS

2 people,1 with 3 times the mass of the other, attempt a tug-of-war on frictionless ice. Show that the heavier person will gain a speed 1/3 that of the lighter person.

asked by sherri on April 4, 2010
23. ## physics

A pendulum of length L = 48.5 cm and mass m = 169 g is released from rest when the cord makes an angle of 65.4 with the vertical. What is the speed (m/s) of the mass upon reaching its lowest point?

asked by waqas on August 9, 2011
24. ## physics

a pelican flying a horizontal path drops a fish from a height of 5.0m. the fish travels 8.1m horizontaly before it hits the water below. what was the pelicans initial speed?

asked by gaby on September 26, 2012
25. ## physics

Two carts with masses of 4.3 kg and 3.0 kg move toward each other on a frictionless track with speeds of 5.7 m/s and 4.4 m/s, respectively. The carts stick together after colliding head-on. Find their ﬁnal speed. Answer in units of m/s

asked by jessy on January 30, 2012
26. ## Physical Science

If there were no air resistance, a quarter dropped from the top of New York's empire state building would reach the ground 9.6 seconds later, what would its speed be? How high is the building?

asked by Brody on January 29, 2012
27. ## Physics

A 0.45-kg soccer ball is kicked at an angle θ above the ground with initial speed vi. Determine the height of the ball as a function of the horizontal distance d it travels down the field.

asked by Mat on November 1, 2016
28. ## Math

Barney works part- time 30 hours a week at the cinema and earns \$6 per hour. If he savea 1/3 of his paycheck each week how much does he have left to speed after 4 weeks?

asked by PlzHelp on April 4, 2011
29. ## physics

a soccer player kicks a stationary ball giving it a speed of 20m/s at an angle of 15degrees to the horizontal. what is the maximum height reached by the ball?

asked by ruby on October 15, 2010
30. ## Physics

A bicycle is racing around on a horizontal surface in a circle of radius 27 m. The force exerted by the road on the bicycle makes an angle of 16 degrees with the vertical. What is its speed?

asked by Jacob on October 1, 2017
31. ## trigonometry

Two pulleys have radii 20cm and 6cm,respectively. The smaller pulley rotates 15 times in 12 seconds. Find the angular speed of each pulley in rad/sec

asked by helpme on July 26, 2014
32. ## Physics

A tennis ball is struck at a speed of 6 m/s horizontally, it departs from the racket at a vertical distance of a 1.02m. How much time is needed for the Ball to hit the ground?

asked by Hector on October 1, 2017
33. ## physics

a car moves from car A to B covering a distance of 600km/h if it covers first 400km at 80km/h and the other remaining at 100km/h .What is the average speed for entire journey

asked by jhanvi on April 10, 2015
34. ## Physics

A rocket of mass 50 kg is launched vertically. Its fuel is being burnt at a rate of 2 kg s-1 and its exhaust gas is being forced out with a speed of 1000 m s-1. What is the initial acceleration of the rocket?

asked by okw on September 8, 2016
35. ## math!!!!

One lap around the track is equal to 1/8 of a mile. A horse ran a distance of 9 laps in 2 minutes and 30 seconds. What was the horse's average speed in miles per minute?

asked by Lidia on February 9, 2014
36. ## Physics

Two carts with masses of 4.3 kg and 3.9 kg move toward each other on a frictionless track with speeds of 5.6 m/s and 5.0 m/s, respec- tively. The carts stick together after colliding head-on. Find their final speed.

asked by Chris on January 26, 2015
37. ## physics

starting from rest s=0,pulley A (rA=50 mm)is given a constant angular acceleration, A=6 rad/s2. Pulley C(rC=150mm) has an inner hub D (rD=75 mm) which is fixed to C and turns with it. What is the speed of block B when it has risen s=6 m ?

asked by lehasa on August 16, 2011
38. ## Physics

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? Can you show the steps too so I can understand? Thanks

asked by Anonymous on January 28, 2013
39. ## physics

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. The mass is 3.8 105 kg, its speed is 25.9 m/s, and the net braking force is 4.27 105 N.

40. ## Math

Vehicle can travel 0-60mph in 7.6 sec. From a dead stop, what is the highest rate of speed vehicle can reach and decelerate to 10mph in 500 ft distance?

asked by Robin on October 12, 2015
41. ## math

a man travelled xhrs at 5km/hr and yhrs at 8km/hr .Distance travelled altogether is 20km. find x and y if the average speed for the journey is 7km/hr

asked by kayode on June 11, 2016
42. ## College Physics

A proton is put on the positive Y axis a large distance (100km) from the origin. What is the minimum speed required in the - Y direction so the proton will just reach the point (0,20) cm?

asked by Marcus on March 3, 2013
43. ## science

A person claps his hands near a cliff and hears the eco after 2 seconds if the speed of the sound in air is 340m/s find the distance of the cliff from the percent

asked by shruthi on March 22, 2017
44. ## Math

Bob and Mary start traveling toward each other from 480 miles apart, each moving at the same speed. They meet after four hours. How fast were they each traveling? I had 20 and then 144 I have tried this problem and everything is wrong.

asked by Kati on June 30, 2015
45. ## physics

A proton is put on the positive Y axis a large distance (100km) from the origin. What is the minimum speed required in the - Y direction so the proton will just reach the point (0,20) cm?

asked by Marcus on March 3, 2013
46. ## Math

If the coefficient of sliding friction for steel on ice is 0.05, what force is required to keep a man weighing 150 lbs moving at constant speed along ice?

asked by Angel on January 15, 2017
47. ## science

A car driver accelerates to a speed of 35 mph and then takes her foot off the pedal. Even though she does not press the brake pedal at any time, she eventually rolls to a stop. What causes that?

asked by Anonymous on April 15, 2014
48. ## physics

A motorcycle accelerates uniformly from rest and reaches a linear speed of 33.4 m/s in a time of 11.6 s. The radius of each tire is 0.265 m. What is the magnitude of the angular acceleration of each tire?

asked by Anonymous on April 9, 2014
49. ## physics

Suppose the ball is kicked horizontally with an initial speed of 9.37m/s. If the ball travels a horizontal distance of distnace 85 meters, how tall is the mountain?

asked by Brooke on November 14, 2011
50. ## physics

a race car travels northward on a straight level track at a contant speed traveling 0.750 km in 20.0s. the return trip over the same track is madein 25.os

asked by Anonymous on February 17, 2011
51. ## Physics

A 862-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 30.0 m/s. What is the average force exerted on the car during this time?

asked by Anonymous on October 24, 2011
52. ## physics

a baseball is thrown at an angle of 25 degrees relative to the ground at a speed of 23.0 m/s. if the ball was caught 42.0 m from the thrower, how hight was the tallest spot in the ball's path?

asked by Zoomba21 on October 4, 2009
53. ## physics

A car is traveling with a constant speed 80 miles per hour a road that makes half a circle. What is the average velocity of the car? Is it: 80(pi/2)=125.6? or should I use the formula: Äd/Ät= 80/(pi/2)=50.95?

asked by Anonymous on May 24, 2010
54. ## pre cal

The radius of the earth is approximately 3960 miles, what is the linear speed of a point on the equator in miles per hour. Round your answer to the nearest mph.

asked by ronneka on February 23, 2011

A 60cm diameter bike wheel starts at rest and develops an angular speed of 12.0 rad/s in 10 seconds. What linear distance does the bike travel?

asked by Megan on February 22, 2011
56. ## Aberdeen

A model rocket is launched straight upward with an initial speed of 40.0 m/s. It accelerates with a constant upward acceleration of 2.50 m/s2 until its engines stop at an altitude of 120 m.

asked by James on September 20, 2010
57. ## Physics

- How do you calculate proper time (Tau) between two events with coordinates (0s, 0m) and another pair of coordinates in a frame S? - how much work must be done on a particle of mass m to move it to a speed of 0.905c?

asked by Sam on April 3, 2009
58. ## Physics

Someone in a car going past you at the speed of 24 m/s drops a small rock from a height of 1.6 m. How far from the point of the drop will the rock hit the ground? The acceleration due to gravity is 9.8 m/s2.

asked by Anna on May 28, 2014
59. ## physics

A flare is fired at an angle of 35 degrees to hit the ground at an initial speed of 250 m/s. How long dies it take for the flare to reach its maximum altitude?

asked by Anonymous on September 27, 2010
60. ## physics

A train moves at a speed 72km/hr. When it approaches the station the driver brakes the train stops in 30 minutes. a) what is the value of deceleration? b) what is the duration it takes to stop?

asked by Mariam on March 20, 2013
61. ## physics

A motorcross racer covers one lap of a 1200 meter track on his motorcycle at a speed of 27 meters per second. How long does it take to ride one lap: A. In seconds? B. In minutes?

asked by Gina on November 20, 2014
62. ## physics

A 0.104 kg rock is attached to a 1.92 m long string and swung in a horizontal circle at a speed of 29.7 m/s. Find the tension in the string. Neglect the effect of gravity.

asked by Alyssa on October 31, 2012
63. ## physics

Carmelita tosses a baseball straight up into the air and it returns to her glove in 3.0s. Show that she has to give the ball a vertical speed of 14.7 m/s if it is to return to her glove in that time.

asked by Daisha on February 12, 2011
64. ## physics

A body is projected vertically upwards with a speed of 40 m/s.Find the distance travelled by body in last second of upward journey?(g=9.8m/s2 neglect effect of air resistance)

asked by mona on May 30, 2014
65. ## physics

A ball is thrown upward from the ground with an initial speed of 26.2 m/s; at the same instant a ball is dropped from rest from a building 14 m high. After how long will the balls be at the same height?

asked by Katie on September 19, 2010
66. ## physics

a 200 newtoon wagon is to be pulled up a a 30 degrees incline at constant speed. how large a force parallel to the incline is needed if friction are negligible?

asked by stieven on August 12, 2013
67. ## Physics 2

A particle with a mass of 3.65×10^−24 kg and a charge of 6.40×10^−19 C starts at rest and is accelerated for a distance of 0.102 m through a uniform electric field having strength E = 7.25×10^4 N/C. What is the resulting speed of the particle(m/s)?

asked by Skippy on July 18, 2015
68. ## physics

what is the total time and displacement if the traveler on a train throw ball on level track straight up relative to the train with a speed of 4.90m/s and velocity of 20.0m/s ?

asked by Ryan on October 8, 2009
69. ## physics

what will be the speed of a 500 kilogram satellite if we apply 100N force on it after each second till 10 hours.the current velocity of this satellite is 16,800 miles per hour?

asked by pooja on April 13, 2016
70. ## Physics

A runner moving at a speed of 7.7 m/s rounds a bend with a radius of 21 m. What is the centripetal acceleration of the runner? My teacher doesn't explain anything very well and I don't understand how to figure it out.

asked by Crystal on November 5, 2014
71. ## Physics

A man drops a stone into a water well on his farm. He hears the sound of the splash 3.25 s later. The acceleration of gravity is 9.8 m/s2 and the speed of sound in air is 326 m/s. How deep is the well?

asked by Sandhu on September 13, 2009
72. ## physics

A car acclerates uniformly from to a rest to a speed 23.7 km/h in 6.5 s.Find the car travels during the time.(Displacement with constant uniform accleration).My only problem is the conversion

asked by A person on September 13, 2012
73. ## college physics

A diver begins a high dive with an angular velocity of 6.3 rad/s. By tucking himself into a ball, he decreases his moment of inertia by a factor of 9.0. What is his new angular speed?

asked by Angela on September 12, 2010
74. ## physics

A variable-speed drill, initially turning at 500 rpm, speeds up to 1300 rpm in a time interval of 0.8 s. What is its average rotational acceleration?

asked by danny on October 10, 2011
75. ## physics

what will be the speed of a 500 kilogram moving satellite if we apply100N force on it after each second till 10 hours and current velocity of this satellite is 16,800 miles per hour?

asked by vikram on April 12, 2016
76. ## Physics

Hello! I was wondering if I could get some help solving this problem? A car travels at a constant speed of 10.0 m/s along a straight highway that is inclined 6.0 degrees for 11.0 s. How high vertically does the car travel?

asked by Gusty on September 23, 2010
77. ## Physics

Hello! I was wondering if I could get some help solving this problem? A car travels at a constant speed of 10.0 m/s along a straight highway that is inclined 6.0 degrees for 11.0 s. How high vertically does the car travel?

asked by Gusty on September 23, 2010
78. ## Physics

An electron is held 2.10 cm from an vertically aligned infinite charged plane and then released from rest. It accelerates toward the plane to the left and collides with a speed of 1.50×107 m/s .

asked by James on April 11, 2016
79. ## Physics

An object is thrown upwards at an initial speed of 19.6 m/s from a height of 65m. Determine how long will take for the object to reach the ground (time of flight). what formula should i use?

asked by Anna on August 29, 2012
80. ## English

Which of the following choices is a strategy that can help speed up reading? A. external distractions B. Using a penor pencial as a pacer C. Use subvocalization I think both B and C are correct. But I could only choose one answer. What do you guys think

asked by Zack on July 8, 2010
81. ## Physics

A force of 132 new inns is applied in pushing a stalled autoMobile at constant speed for a distance of 150 m. How much work is done in joules on the car by the force ?

asked by Mirlande on March 5, 2017
82. ## physics

A player passes a 0.600- basketball downcourt for a fast break. The ball leaves the player's hands with a speed of 8.40 and slows down to 7.20 at its highest point.

asked by inaazrina on September 16, 2012
83. ## physics

A player passes a 0.600- basketball downcourt for a fast break. The ball leaves the player's hands with a speed of 8.40 and slows down to 7.20 at its highest point.

asked by inaazrina on September 16, 2012
84. ## science

an aircraft travelling at 600km/hr accelerates steadily at 10 km /h every second. Assuming speed of sound is 100 km /h t the aircrafts altitude , how long will it take to reach the sound barrier

asked by neha on April 23, 2014
85. ## algebra 1 part 2

What are the minimum, first quartile, median, third quartile, and maximum of the data set? As cars passed a checkpoint, the following speeds were clocked and recorded. Speed (mph): 55 62 61 54 68 72 59 61 70

asked by melinda on April 1, 2013
86. ## Tcc

What are the magnitudes of (a) the angular velocity, (b) the radial acceleration, and (c) the tangential acceleration of a spaceship taking a circular turn of radius 3220 km at a speed of 29000 km/h?

asked by Lina on April 10, 2014
87. ## Physics

At what speed will a car round a 52-m-radius curve, banked at a 45 degree angle, if no friction is required between the road and tires to prevent the car from slipping? (g=9.8m/s^2)

asked by Katie on June 8, 2010
88. ## chemistry

Suppose a sports runner completes a 10K (10.0km) road race in 42 minutes and 27 seconds. What is the runner's average speed in miles per hour?

asked by kimberly harris on September 12, 2013
89. ## physics

a 1500 kg car moving with a speed of 15 m/s collides with a utility pole and is brought to rest in 0.3 s. Find the average force exerted on the car during the collision.

asked by Kriti on February 7, 2011
90. ## physics

A crate with mass 32.5 kg initially at rest on a warehouse floor is acted on by a net horizontal force of 140 . How far does the crate travel in 10.0s? What is its speed at the end of 10.0s?

asked by colleen on August 22, 2009
91. ## physics

(a) The sound of the splash is actually heard 2.2 s after the rock is released from rest. How far below the top of the well is the surface of the water? The speed of sound in air (at the ambient temperature) is 336 m/s.

asked by jammy on February 10, 2011
92. ## Physics

Calculate the acceleration of a car that is travelling at a constant speed of 100 km per hour on a straight road. The radius R of the Earth is 6370 km. Why do we not feel this acceleration?

93. ## physics

the wooden crate in the figure below has a mass of 40kg. How much horizontal force is needed to A. start it moving B. to keep it moving along the wood floor at a constant speed

asked by kheith on October 19, 2009
94. ## physics!

A freight train has a mass of 1.8 × 10 7 kg. If the locomotive can exert a constant pull of 6.2×10 5 N, how long does it take to increase the speed of the train from rest to 70 km/h? Answer in units of min.

asked by monica on January 5, 2011
95. ## Physics

A ball is thrown from a cliff upward with a speed of 27 m/s and at an angle of 71 degrees to the horizontal. How high does it go above the cliff to the nearest tenth of a meter? answer is 33.3. I am using 27sin71.

asked by Jay on September 2, 2013
96. ## physics

A freight train has a mass of 1.2 107 kg. If the locomotive can exert a constant pull of 6.5 105 N, how long does it take to increase the speed of the train from rest to 60 km/h? ____min

asked by jerr on September 29, 2010
97. ## Physics

A baseball is thrown off a cliff at an angle of 57 degrees with a speed of 25 m/s. How high is the cliff to the nearest tenth of a meter, if the ball hits the ground 6.2 sec later.

asked by Jay on September 2, 2013
98. ## physics

Find the required angular speed, ω, of an ultracentrifuge for the radial acceleration of a point 2.00cm from the axis to equal 6.00×105 g (where g is the acceleration due to gravity).

asked by Anonymous on May 27, 2014
99. ## physics

A variable-speed drill, initially turning at 250 rpm, speeds up to 1300 rpm in a time interval of 0.1 s. What is its average rotational acceleration?

asked by yanna on December 2, 2018
100. ## maths

A plane flies northwards for a speed of 430km. It then flies Eastwards for 380km . how far is it from its starting point.(ignore its height above the ground.) Use Pythagoras rule.

asked by tunmi on May 24, 2017