# A tired squirrel (mass of 1kg) does push-ups by applying a force to elevate it's center of mass by 5cm. Determine the number of push-ups which a tired squirrel must do in order to do a mere 5.0joules of work.

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1. ## physics

four particles of masses 1kg, 2kg,3kg, and 4kg are at vertices of a rectangle of sides a and b.if a=1m and b=2m find the location of the center of mass

2. ## Physics

to strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push ups. his center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0cm from the top of his head. find the force that the floor exerts

3. ## Physics

A 1.00kg ball and a 2.00kg ball are connected by a 4.63m long rigid, massless rod. The rod is rotating clockwise about its center of mass at 33.0rpm. What torque will bring the balls to a halt in 4.07s? My Attempt: Center of Mass = [(1kg)(0m) +

4. ## physics

A tired squirrel (mass of 1kg) does push-ups by applying a force to elevate it's center of mass by 5cm. Determine the number of push-ups which a tired squirrel must do in order to do a mere 5.0joules of work.

5. ## PHYSICS

A person whose weight is W=584 N doing push-ups. Find the normal force exerted by the floor on each hand each foot, assuming that the persons holds this person |=central gravity foot arm -------|-------- .840m .410m

6. ## physics

A force acts on a 2kg mass and gives it an acceleration of 3 m/s^2. what acceleration is produced by the same force when acting on a mass of (1) 1kg? (2) 4kg? (3) how large is the force?

7. ## physics

Blocks with masses of 1kg , 4kg , and 6kg are lined up in a row on a frictionless table. All three are pushed forward by a 50N force applied to the 1kg block. How much force does the 4kg block exert on the 6kg block? How much force does the 4kg block exert

8. ## physics!

A student is about to do a push-up. Her center of gravity lies directly above P on the ﬂoor, which is 1.1 m from her feet and 0.4 m from her hands. If her mass is 55 kg, what is the force exerted by the ﬂoor on her hands? The acceleration of gravity is

9. ## physics

A man doing push-ups pauses in the position shown in the figure . His mass m = 80 kg. In push up position: From hands to waist = 40 cm From waist to feet = 95 cm height - heel of foot to ground = 30 cm Determine the normal force exerted by the floor on

10. ## phyics

The figure shows a person whose weight is W = 500 N doing push-ups. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this position.

11. ## Physics

a rocket following a parabolic path through the air suddenly explodes into many pieces. what can you say about the motion of this system. and If only an external force can change the momentum of the center of mass of an object, how can the internal force

12. ## Physics

A man doing push-ups pauses in the position shown in the figure . His mass = 68 kg. Image: img145.imageshack.us/img145/7130/picture1n.png a= 40 cm b= 95 cm c= 30 cm Determine the normal force exerted by the floor on each hand. Determine the normal force

13. ## AP Physics - Static Equilibrium

A man doing push-ups pauses in the position shown in the figure. His mass is 75-kg. Determine the normal force exerted by the floor on each hand and on each foot. img145.imageshack.us/img145/7130/picture1n.png (copy into url bar) a = 40 cm b = 95 cm c = 30

14. ## PHYSICS

a 75kg parent and a 22kg child meet at the center of an ice rink. they place their hands together and push hard enough to slide apart. a. is the force experienced by the child more than, less than, or the same force experienced by the parent? I said they

15. ## Personal fitness

2._____ training must target the muscle group that is needed for the activity you are training for. the best way to train your body to be able to do more push ups is to do push ups. (1 point) muscular endurance. cardio strength. aerobic. speed.

16. ## physics

A 60 kg student does 60 push ups in 40s . With each push up , the student must lift 70% of the body mass a height of 40cm off the floor. Assuming two significant digits, calculate the following The work the student does against a force of gravity for each

17. ## physics

If you stand next to a wall on a frictionless skateboard and push the wall with a force of 40N, how hard does the wall push on you ? If your mass is 80kg show that your acceleration is 0.5m/s^2

18. ## Physics

To strengthen his arm and chest muscles, an 83.0 kg athlete 2.00 m tall is doing a series of push-ups. His center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head. Find the force that the

19. ## college physics

Three blocks of mass 1kg,2kg and 3kg move on a frictionless surface and a horizontal force 46 N acts on the 3kg block.1kg and 2kg blocks are in contact with each other while 1kg and 3kg blocks are connected by a chord. (a) Determine the acceleration of the

20. ## physics

The drawing shows a person (weight W = 581 N, L1 = 0.843 m, L2 = 0.404 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position. force on each hand N force on each foot N

21. ## science

A bowling ball has a mass of 10 kg and it is accelerating at a rate of 2m/s2. Calculate the force with which it hits the pins. force= mass*acceleration units: 1 newton= 1kg m/s^2

22. ## PHYSICS

a 75kg parent and a 22kg child meet at the center of an ice rink. they place their hands together and push hard enough to slide apart. a. is the force experienced by the child more than, less than, or the same force experienced by the parent? I said they

23. ## Physics

A box of mass 1kg is placed on a table and is connected to a hanging mass m by a string strung over a pulley. If the coefficient of kinetic friction between the box and the table is .3 and the box slides at a constant speed of .5m/s what is the weight of

24. ## science

a bullet of mass 20g traveling horizontally at 100m/s embedded itself in the center of block of wood mass 1kg which is suspended by a light vertical string of length

25. ## physics

a body of mass 1kg on the equator rotates about the axis of the earth with a period of 1 day. (mass of earth = 5.98x10^24kg n may b assumed to b concentrated at its centre n radius of earth = 6380km) first question asks to calculate gravitational force of

26. ## physics

A 1.0-kg cart and a 0.50-kg cart sit at different positions on a low-friction track. You push on the 1.0-kg cart with a constant 2.5-N force for 0.15m . You then remove your hand, and the cart slides 0.35 m and strikes the 0.50-kg cart. By what amount does

27. ## Physics Classical Mechanics

A playground merry-go-round has a radius of R= 2 m and has a moment of inertia Icm= 9×103kg⋅m2 about a vertical axis passing through the center of mass. There is negligible friction about this axis. Two children each of mass m= 30kg are standing on

28. ## Physics

A force vector F of magnitude 12N is applied to a FedEx box of mass m2=1kg. The force is directed up a plane tilted by theta=37 degrees. The box is connected by a cord to a UPS box of mass m1=3kg on the floor. The floor, plane, and pulley are frictionless,

29. ## PHYSICS (HELP)

A playground merry-go-round has a radius of R= 2 m and has a moment of inertia Icm= 9×103kg⋅m2 about a vertical axis passing through the center of mass. There is negligible friction about this axis. Two children each of mass m= 20kg are standing on

30. ## Physics

A person whose weight is W = 658 N is doing push-ups. From his feet to his center of gravity he is 0.840m and from the center of gravity to his hands is 0.410m. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that

31. ## Physics

A man doing push-ups pauses in the position shown in the figure . His mass = 68 kg. Determine the normal force exerted by the floor on each hand. Determine the normal force exerted by the floor on each foot.

32. ## Physics

A student is about to do a push-up. Her center of gravity lies directly above P on the ﬂoor, which is 1.2 m from her feet and 0.6 m from her hands.If her mass is 56 kg, what is the force exerted by the ﬂoor on her hands? The acceleration of gravity is

33. ## physics/math

Joe is a former basketball player who is now a work-out junkie, and especially loves to do push-ups. He was a good athlete, but not so good at science in school, especally not good in Physics. He wants you, yes you, to calculate how much work he does, in

34. ## physical

to strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push ups. his center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0cm from the top of his head. find the force that the floor exerts

35. ## Physics

An object m of mass m=1kg is attached to a string that passes through a hole in the center of a table. The object m moves in a circle of radius r=1.3m. An object M of mass M=2.1kg is tied to the other end of the string, and hangs vertically beneath the

36. ## Physics

The drawing shows a person (weight W = 592 N, L1 = 0.841 m, L2 = 0.410 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position. force on each hand N force on each foot N

37. ## Physics 141

The drawing shows a person (weight W = 586 N, L1 = 0.837 m, L2 = 0.397 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position. force on each hand N force on each foot N

38. ## Physics

A meter rule is placed horizontally at a fixed point, 1 mass are suspended at both right hand and left hand of the meter. from the center of the meter rule, a masses is hung 20.5cm are wild from the center ...., a mass of 0.1kg is hung at other side from

39. ## physics

suppose you exert 150N on your refrigerator and push it across the kitchen floor at constant velocity. a. is the friction force equal and opposite to your 200N push? explain b. does the friction force make up the reaction force to your push?

40. ## physics

suppose you exert 150N on your refrigerator and push it across the kitchen floor at constant velocity. a. is the friction force equal and opposite to your 200N push? explain b. does the friction force make up the reaction force to your push?

41. ## physics- MC QUESTIONS

1. You push a block up a ramp with friction. The block is moving at constant speed ? A) The force you push with is greater than the force of kinetic friction. B) The force you push with is less than the force of kinetic friction. C) The force you push with

42. ## physics

The drawing shows a person (weight W = 580 N, L1 = 0.849 m, L2 = 0.410 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position.

43. ## Phyics help

I have a few physics questions: 1. How much mechanical work is done by a weightlifter holding a mass of 100 kg, 2.0m above the floor for 3.0 s? Explain ur answer. 2. Calculate the force needed to do 2.0 kJ of work to push a load of bricks 10m? 3. A

44. ## physics

a ball of mass 0.1kg makes an elastic head on collision with a ball of unknown mass,initially at rest .if the 0.1kg ball rebounded at one third of its original speed, what is the mass of the other ball?

45. ## physics

A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc

46. ## Physics

A rogue chipmunk has been raiding the secrete acorn stash of 3 squirrels. On discovering the perpetrator in the very act they secure him with 3 ropes and attempt to pull him off the limb where he falls to his demise. The first squirrel pulls at an angle of

47. ## Universal gravitation, fields

Really basic question but I wanted to just double check something. Im trying to work out where to place a point particle between two objects (one has a mass 4 times the other). Now ive used very basic approximations as its just a rough idea I need so ive

48. ## physics

A disc has a mass of 340kg, and is mounted to a frictionless axle and is free to rotate around it. Model the shape of the disc as a hollow shaft on axis where the inner and outer diameters are 600mm and 1200mm respectively. A wire is wrapped around the

49. ## physics

The figure shows a person whose weight is W = 670 N doing push-ups. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this position.

50. ## physics

The drawing shows a person (weight W = 580 N, L1 = 0.849 m, L2 = 0.410 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position.

51. ## physics

A force given by F(x) = 4x^3 x̂ (in N/m^3) acts on a 1kg mass moving on a frictionless surface. The mass moves from x = 4 m to x = 7 m. (a) How much work is done by the force? (b) If the mass has a speed of 1 m/s at x = 4 m, what is its speed at x = 7 m?

52. ## physics

suppose you exert 150N on your refrigerator and push it across the kitchen floor at constant velocity. a. is the friction force equal and opposite to your 150N push? explain b. does the friction force make up the reaction force to your push?

53. ## physics

Consider a 1kg mass at rest at the equator.Because of the earths rotation , the mass experiences a centripetal acceleration. a)Draw free body diagram of mass b)Find centripetal force acting in the mass c)Compare apparent weight and true weight d)what

54. ## Physics

A 1kg block of wood is moving with a velocity of 10 m/s on top of a table. The coefficient of kinetic friction between the block of wood and the table is 0.1. The block of wood is a cube with sides of 12 cm. How far does the block move before coming to a

55. ## physics

A 1kg block of wood is moving with a velocity of 10 m/s on top of a table. The coefficient of kinetic friction between the block of wood and the table is 0.1. The block of wood is a cube with sides of 12 cm. How far does the block move before coming to a

56. ## PHYSICS

A person whose weight is W=584 N doing push-ups. Find the normal force exerted by the floor on each hand each foot, assuming that the persons holds this person |=central gravity foot arm -------|-------- .840m .410m

57. ## Laws of Motion

Two skaters are in the exact center of a circular frozen pond. Skater 1 pushes skater 2 off with a force of 100 N for 1.4 seconds. If skater 1 has a mass of 30 kg and skater 2 has a mass of 74 kg, a) what is the relative velocity (v1 - v2) after the push

58. ## physics

in a tug of war a jeep of a mass 1400kg and a tractor of a mass of 2000kg pull on a horizontal rope in opposite directions. at one instant, the tractor pulls on the rope with a force of 1.50*10^4N while its wheels push horizontally against the groud with a

59. ## Physics

The drawing shows a person (weight W = 592 N, L1 = 0.841 m, L2 = 0.410 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position. force on each hand N force on each foot N I post

60. ## PHYSICS ---HELP!

A man doing push-ups pauses. His mass is 80-kg. Determine the normal force exerted by the floor on each hand and on each foot. a = 40 cm b = 95 cm c = 30 cm W = mg = 784 N

61. ## physics

A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight? What is the frictional force between the disc

62. ## Physics

1. A guy is doing push ups, the length of the guy is 1.5 m, centre of mass is 0.9 m from the legs. He stops during the push up and holds the position in such a manner that his bent arm forms a 90 degree angle. Mass of the man is 50 kg. Find the force of

63. ## volume,mass,weight

if you travelled to a planet that had twice the force of gravity of earth and you have taken a small mass that is 1kg what is the mass weight and volume of the 1kg object on the new planet compared to earth

64. ## physics

suppose you exert 150N on your refrigerator and push it across the kitchen floor at constant velocity. a. is the friction force equal and opposite to your 200N push? explain b. does the friction force make up the reaction force to your push?

65. ## physics

suppose you exert 150N on your refrigerator and push it across the kitchen floor at constant velocity. a. is the friction force equal and opposite to your 200N push? explain b. does the friction force make up the reaction force to your push?

66. ## Science

You push a book on a table so that its velocity is constant. If the force that you apply is 15N. What is the force due to sliding friction? If you accelerate , so that the velocity is no longer constant is the force that you are applying to the book

67. ## Science

You push a book on a table so that its velocity is constant. If the force that you apply is 15N. what is the force due to sliding friction? If you accelerate, so that the velocity is no longer constant is the force you are applying to the book greater or

68. ## physics

The drawing shows a person (weight W = 580 N, L1 = 0.849 m, L2 = 0.410 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position.

69. ## English

1. I am too tired to do my homework. 2. I am too tired to read the books. 3. I am too tired to do the project. 4. I am too tired to do the paperwork. 5. I am too tired to finish my homework. 6. I am too tired to finish reading the book. ============ Are

70. ## Physics

A box of mass 1kg is placed on a table and is connected to a hanging mass m by a string strung over a pulley. If the coefficient of kinetic friction between the box and the table is .3 and the box slides at a constant speed of .5m/s what is the weight of

71. ## Physics

A 400.0 KG mass experiences a horizontal push force of +720N And friction force of 320N A) assuming the mass is initially moving at 5.0 m/s far will it travel in 6.0 s? B) how much work does the 720.0 newton force do over the distance determine in part a?

72. ## science

A squirrel is picking up acorns from the bottom of an oak tree. The squirrel is picking up the acorns from an oak tree. What is the most likely way some of the acorns could grow into an oak tree? A. Some acorns may stick to the squirrel's fur and be

73. ## Physics

A 400.0 KG mass experiences a horizontal push force of +720N And friction force of 320N A) assuming the mass is initially moving at 5.0 m/s far will it travel in 6.0 s? B) how much work does the 720.0 newton force do over the distance determine in part a?

74. ## Physics. Appreciate the help I can get.

A 400.0 kg mass experiences a horizontal push force of +720 N and a friction force of 320 N. A) assuming the mass is initially moving at 5.0 m/s how far will it travel in 6.0s? B) how much work does the 720.0 Newton force do over the distance determined in

75. ## math

Ali is planning to keep fit through practicing push-ups for 21 days. on the first day, he can only do 14 push-ups in a minute. He plans to do x more push-ups in a minute on the next day. How many push-ups can he do in a minute on 11th days? (in term of x)

76. ## PHYSICS ---HELP!

A man doing push-ups pauses. His mass is 80-kg. Determine the normal force exerted by the floor on each hand and on each foot. a = 40 cm b = 95 cm c = 30 cm W = mg = 784 N

77. ## Math

Jared did 20 push-ups per day for 5 days. How many push-ups did he do in all?**

78. ## Math

Drew does push-ups every three days starting on 3 January. He does sit-ups every four days starting on January 4, On which days in January will he do both push-ups and sit-ups? Use words, numbers, or models to justify your answer

79. ## mathematics

For every 5 push-ups that Oscar does, Noah does 7 each morning. After Noah drinks a protein shake in the evening, Noah does 9 push-ups for every 3 push-ups Oscar does. If Noah does 99 push-ups after his protein shake, how many push-up will he do in the

80. ## Math

Dr ew does push ups every three days starting on January 3. He does sit-ups every four days starting on january 4, On which days in January will he do both push-ups and sit-ups? Use words numbers, or models to justify your answer.

81. ## Enegry

Are there ways to have more enegry. You see during second period yesterday like during gym we were during war ups (ugh I HATE THE WAR UPS) ans when I was running, & skipping I felt so tired & losing enegry so is there any ways I can have MORE MORE MORE

82. ## physics

A .1kg mass is located on the line between a 5kg mass and a 10kg mass. It is 4m to the right of the 5kg mass and 6m go the left of the 10kg mass. What is the magnitude and direction of the net force on the .1kg mass?

83. ## Math

6, 7, 8, 9, 12, 13, 14, 16, 23, 23 A student did the following push ups in gym class. Which of the following would be used to say he did the most push ups? mean median mode mean-13.1 median- 12.5 mode-23 The answer is the mode?

84. ## English

1. I can do 20 push-ups. 2. I can push-up 20 times. [Are both okay? Can we use #2? Do you have similar expressions to #1?]

85. ## physics

suppose you exert 150N on your refrigerator and push it across the kitchen floor at constant velocity. a. is the friction force equal and opposite to your 200N push? explain b. does the friction force make up the reaction force to your push?

86. ## Math

For every 3 push-ups Hope does, Morgan does 2. If Hope did 24 push-ups, how many more push-ups did Hope do than Morgan?

87. ## physics

img145.imageshack.us/img145/7130/picture1n.png this is basically the diagram to my question A person of mass m = 62 kg is doing push-ups as shown in the attached figure. The distances are a = 91 cm and b = 60% of l1. Calculate the vertical component of the

88. ## Math

Tim was on an exercise program that required him to do one push up the first day and double the numberh e does each day How many push ups will he have to do on the eigth day 10 16 64 128 16?

89. ## Physics

A box of mass 1kg is placed on a table and is connected to a hanging mass m by a string strung over a pulley. If the coefficient of kinetic friction between the box and the table is .3 and the box slides at a constant speed of .5m/s what is the weight of

90. ## physics

You push a 8.00 kg suitcase across a smooth horizontal floor applying a force directed 31.5 degrees below the horizontal. Someone measures the acceleration of the suitcase to be 1.73 m/s2. Assuming g = 10.0 m/s2, what is the normal force the ground exerts

91. ## maths

the mass of a boy is 36.1kg when rounded off to 1 decimal place. If his mass is less than 36.1kg, what is his possible mass?

92. ## physics

A jumper of mass m=55 kg starts in a crouched position with the jumper's center of mass at a position y1=0 m. Just before the jumper leaves the floor, his or her center of mass is at y2=0.7 m. From another measurement, you have found that the velocity of

93. ## Pe

When you do push ups, your back needs to be as flat as possible. True False

94. ## Thousandths

A squirrel is 1.1 feet tall. The squirrel shrinks to one tenth of its height. How tall is the squirrel now?

95. ## Gym (Physical Education)

what should i do if i cant so any push ups? ill look so weak then people would pick on me im so scared what should i do?!?!!?!?!??!

96. ## Algebra

While going for my daily run, I passed a squirrel carrying a nut in her mouth. When she saw me, she ran towards a safe place and, coming to a stone wall, easily jumped up on it and disappeared. I began to wonder how high I could jump if I were a squirrel.

97. ## Algebra

While going for my daily run, I passed a squirrel carrying a nut in her mouth. When she saw me, she ran towards a safe place and, coming to a stone wall, easily jumped up on it and disappeared. I began to wonder how high I could jump if I were a squirrel.

98. ## Physics

I push a stack of six books (each weighting 4 kg) horizontally across a table to the right with a kinetic coefficient of friction uk = 0.5. I apply a force of 120 N. a) What is the acceleration of the books? b) what is the force of the rightmost book on

99. ## math

Sally does 42 push ups in 2 minutes. What is the unit rate expressed as a fraction?

100. ## Math

She does sit-ups.The table shows how long it takes her to do different numbers of sit-ups. # of Sit-Ups | 10. | 30. |. 50. |. 200 | Minutes. |. 2. |. 6. |. 10. |. 40 | How long do you predict it will take her to do 120 sit-ups?