# An object of mass .550kg is lifted from the floor to a height of 3.5m at a constant speed. How much work is done by the lifting force (include units)? b.) How much work is done by the Earth on

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1. ## physics

An object rolls off a tabletop with a horizontal velocity v0x = 2.5 m/s. The table is at a height y0 = 0.55 m, above the floor. Use a coordinate system with its origin on the floor directly beneath the point where the object rolls off the table, its

2. ## physics

A 4.0 kg object is lifted 1.5 m. (a) how much work is done against the earth's gravity ? (b) repeat if the object is lowered insteadof lifted

3. ## Physics

the work done in lifting a 600-N barbell 1.6m above the floor. What is the gain of potential energy of the barbell when it is lifted to this height? Express your answer to two significant figures and include the appropriate units.

4. ## Physical Science

Two objects were lifted by a machine. One object had a mas of 2 kilograms, and was lifted at a speed of 2 m/sec. The other had a mass of 4 kilogram was lifted at a rate of 3 m/sec. ------------------------------------------- a) Which object had more

5. ## physics

an object weighing 15 newtons is lifted from the ground to a height of 0.22 meter. What is the approximate increase in the object's gravitational potential energy?

6. ## Physics

An object of mass .550kg is lifted from the floor to a height of 3.5m at a constant speed. How much work is done by the lifting force (include units)? b.) How much work is done by the Earth on the object? c.) What is the net work done on the object? d.)

7. ## Physics

After a 0.300-kg rubber ball is dropped from a height of 1.75 m, it bounces off a concrete floor and rebounds to a height of 1.50 m. (a) Determine the magnitude and direction of the impulse delivered to the ball by the floor. (b) Suppose the ball is in

8. ## physics

In the Atwood's machine of Figure 8-23, the two masses shown are initially at rest at the same height. After they are released, the large mass, m2, falls through a height h and hits the floor, and the small mass, m1, rises through a height h. The mass m2

9. ## physics

The two masses in the Atwood's machine shown in the figure are initially at rest at the same height. After they are released, the large mass, , falls through a height and hits the floor, and the small mass, , rises through a height . Find the speed of the

10. ## physics

A golf ball of mass m = 0.12 kg is dropped from a height h. It interacts with the floor for t = 0.14 s, and applies a force of F = 10.5 N to the floor when it elastically collides with it.

11. ## PHYSICS

A ball of mass 0.150kg is dropped from a height of 1.25m. It rebounds from the floor to reach a height of 0.960m. What impulse was given to the ball by the floor?

12. ## physics

A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.600 m. What impulse was given to the ball by the floor?

13. ## sasas

A simple pulley with the given radius r used to lift heavy objects is positioned 10 feet above ground level. Given that the pully rotates °, determine the height to which the object is lifted. (a) r  4 in.,   720°

14. ## physics

An object is lifted from the surface of a spherical planet to an altitude equal to the radius of the planet. As a result, what happens to the mass and wieght of the object?

15. ## physics

A steel ball is dropped onto a hard floor from a height of 2.15 m and rebounds to a height of 2.09 m. (Assume that the positive direction is upward.) (a) Calculate its velocity just before it strikes the floor. -6.49 m/s (b) Calculate its velocity just

16. ## plz help me

1)When a 10-kg crate is pushed across a frictionless horizontal floor with a force of 14 N, directed 25° below the horizontal, the magnitude of the normal force of the floor on the crate is (g = 10 m/s2): 2)A constant force of 2.8 N is exerted for 9.0 s

17. ## momemtum ?

A ball of mass 0.150 kg is dropped from rest to a height of 0.125 m. It rebounds from the floor to reach a height of 0.960m. What impulse was given by the floor? please help/explain. Thanks!

18. ## phsics

a 4-kg box is pushed across a level floor with a force of 60n for a displacemen of 20m then lifted to a height of 3 m. what is total work done on the box?

19. ## Physics

1-A car is lifted a certain distance in a service station and therefore has potential energy with respect to the floor. If it were lifted twice as high, how much potential energy would it have? Answer: twice as much 2-Two cars, one twice as heavy as the

20. ## phy

Review. An object with a mass of m 5 5.10 kg is attached to the free end of a light string wrapped around a reel of radius R 5 0.250 m and mass M 5 3.00 kg. The reel is a solid disk, free to rotate in a vertical plane about the horizontal axis passing

21. ## physics

an object is dropped from the window of an apartment in a high rise building reaches the ground in 3 seconds. on which floor the apartment is located if height of each floor is 4m and window is 1 meter above the ground of that floor?

22. ## physics

I need help attacking this problem A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's

23. ## Physics

An object of mass .550kg is lifted from the floor to a height of 3.5m at a constant speed. If the object is released from rest after it is lifted, what is its kinetic energy just before it hits the floor? What is its velocity? Show your work and units.

24. ## Math-Algebra

1. The force (in Newtons) applied to an object varies jointly as its mass and acceleration. How much force is needed to accelerate a 25 kg object by 3 m/s^2? 2. The potential energy of an object varies jointly as its mass and height from the ground. If the

25. ## Physics

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor

26. ## Physics

A thin rod (length = 1.03 m) is oriented vertically, with its bottom end attached to the floor by means of a frictionless hinge. The mass of the rod may be ignored, compared to the mass of the object fixed to the top of the rod. The rod, starting from

27. ## physics

A 7.5-kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling. If the box is being lifted at a constant speed of 2.0m/s, what is the power delivered by the person pulling

28. ## physics

An object rolls off a tabletop with a horizontal velocity v0x = 2.5 m/s. The table is at a height y0 = 0.55 m, above the floor. Use a coordinate system with its origin on the floor directly beneath the point where the object rolls off the table, its

29. ## physics

Two objects are connected by a light string passing over a light, frictionless pulley as in the diagram. m1 = 4.50 kg, m2 = 2.10 kg, and h = 4.30 m. The 4.50 kg object is released from rest at a point 4.30 m above the floor. Determine the speed of each

30. ## Physics

1.) The earth's radius is about 3956.52 mi. An object that has a mass of 20 kg is taken to a height of 160 km above the earth's surface. a. What is the mass of the object at this height? b. How much does the object weigh at this height?

31. ## physics

A rubber ball (mass 0.21 kg) is dropped from a height of 1.7 m onto the floor. Just after bouncing from the floor, the ball has a speed of 3.6 m/s. (a) What is the magnitude and direction of the impulse imparted by the floor to the ball? Magnitude?

32. ## Phy

In the figure, a block of mass m = 3.09 kg is pulled along a horizontal frictionless floor by a cord that exerts a force of magnitude F = 13.7 N at an angle θ = 23.0°. (a) What is the magnitude of the block's acceleration? (b) The force magnitude F is

33. ## physics

an object weighing 15 newtons is lifted from the ground to a height of 0.22 meter. What is the approximate increase in the object's gravitational potential energy?

A small circular object with mass m and radius r has a moment of inertia given by I = cmr2. The object rolls without slipping along the track shown in the figure. The track ends with a ramp of height R = 3.0 m that launches the object vertically. The

35. ## Physics

A ball whose mass is 100g is dropped from a height of 2m from the floor. it rebounds vertically upwards after colliding with the floor to a height 1.5 m. Find(a)The momentum of the ball before and after collision,(b)the average force exerted by the floor

36. ## Physics

The 10 kg mass is released from rest at a height of 1m above the floor. If the co-efficient of kinetic friction between the 5 kg mass and the table is 0.28, what will be the speed of the 10 kg mass just before it hits the floor? Please show the equation

37. ## Physics

A 3 kg object falls from a height of 10 m. What is its velocity just before it hits the ground? How would this problem differ if the object falling from a height of 10 m only had a mass "m"?

38. ## physics

two objects of equal mass are placed in a room. Object A is placed on the floor and object B is placed on a table top that is 3 meters of the ground. Which one has more potential energy and why?

39. ## Physics

A 5.1–kg block is pulled along a frictionless floor by a cord that exerts a force P = 12 N at an angle θ = 25° above the horizontal, as shown below. (a) What is the acceleration of the block? (b) The force P is slowly increased. What is the value of P

40. ## Physics

A small circular object with mass m and radius r has a moment of inertia given by I = cmr2. The object rolls without slipping along the track shown in the figure. The track ends with a ramp of height R = 3.0 m that launches the object vertically. The

41. ## Physics

The mass of a beetle is 0.000004kg. If a beetle's center of mass rises 0.75 mm while it is pushing against the floor and then continues to travel up to a height of 250 mm above the floor, what is the magnitude of the force exerted by the floor on the

42. ## physics

An engine provides a 10kw of power to lift a heavy load at a constant velocity a distance 20m in 5s. what is the mass of the object being lifted?

43. ## maths

the load which a crame can lift up is directly proportional to the mass and inversely proportional to the height through which the load is to be lifted.if a load of 40+ and mass of 175gm is lifted through height from what load will be carried through

44. ## Physics

calculate the work done by a bricklayer who lifted cement block of mass 10kg from the floor to a height of of 2.5m (acceleration due to gravity is 9.8ms²)?

45. ## Science

A 4 kg object is lifted 1.5m. a)how much work is against gravity? B)Repeat if the object is lowered instead of lifted?

46. ## Science

A ball of mass 200 g is dropped from a height 3 m above the ground onto a hard floor, and rebounds to a height of 2.2 m. If the ball is in contact with the floor for 0.002 s calculate the average force exerted by the floor on the ball

47. ## physics

A person bends over, and lifts an object of mass m = 28.5 kg while keeping the back parallel with the floor. The muscle that attaches 2/3 of the way up the spine maintains the position of the back. This muscle is called the back muscle or latissimus dorsi

48. ## physics

A worker has to move a rock with mass 50 kg on a stairway from the first floor to the second floor of a house. The second floor is 4.6 m above the first floor and the stairway has 18 steps. The rock is lifted from step to step. How much energy (in Joule)

49. ## physics

When a 6kg mass is lifted from ground to a height of 12 meters,the gravitational potential energy of the mass increases. Calculate how much will be the increase?

50. ## physics

A 100-kg object is lifted to an altitude of 1000 km. What is the weight of the object on the ground? Does it have the same mass and weight at 1000 km? Explain.

51. ## Physics

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor

52. ## Physics

An object ob 2 kg mass is initially at rest on the ground. then, the object is pulled up by a 20N force in 4s before it is finally released. the maximum height that the one object can reach is ...

53. ## physics

the coefficient of restitution between the ball and the floor is 0.60 If the ball is drop from rest at the height of 6.6 m from the floor. Find a) what is the maximum height will the ball attain after the first bounce. b) how much kinetic energy is lost

54. ## university physics

A cable is used to lift a 310. kg crate upward, resulting in 7.82×103 N of tension in the rope. Using work and energy, solve for the speed of the crate after being lifted from rest to a height of 1.40 m above the floor.

55. ## Physics

How much work is done in lifting a 6kg object from the ground to a height of 4m? A 12n object is lifted 5m how much work is done How much work is done if a 5n object is lifted from the ground to a height of 8m? How much gravitational potential energy does

56. ## physics

A 6.9-kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling.Lifted at a constant speed of 2 m/s. If the box is lifted, at constant acceleration, from rest on the floor

57. ## maths(variation)

pls when solving finish it up!!! Very urgent! 1) the load which a crame can lift up is directly proportional to the mass and inversely proportional to the height through which the load is to be lifted.if a load of 40 and mass of 175gm is lifted through

58. ## variation

the load which a crame can lift up is directly proportional to the mass and inversely proportional to the height through which the load is to be lifted.if a load of 40 and mass of 175gm is lifted through height of 286m,from what load will be carried

59. ## math

the load which a crame can lift up is directly proportional to the mass and inversely proportional to the height through which the load is to be lifted. If a load of 40 and mass of 175gm is lifted through height of 286m from what load will be carried

60. ## physics

A light inflexible cable is wrapped around a cylinder of mass , radius , and moment of inertia about the center of mass . The cylinder rotates about its axis without friction. The cable does not slip on the cylinder when set in motion. The free end of the

61. ## Physics

Can you plz give explaination to the solutions steps by steps in brief? Cz i really don't understand how 2 apply the formula when i revise it nw. Thnkz a lot. [g=10 ms^-2] Particles P, of mass 0.3 kg & Q, of mass 0.2 kg are attached to the ends of a light

62. ## physic

A force of 12 N acts on an object of mass 10kg and moves it with a constant velocity across a floor. What is the coefficient of fiction between the object and the floor?

63. ## Physics

In a vertical lifting an object with mass of 2kg is lifted 1m above the ground. A work of 80J is done with a constant force. What is the acceleration of the object?

64. ## PHYSICS

A light inflexible cable is wrapped around a cylinder of mass m1 , radius R , and moment of inertia about the center of mass Ic . The cylinder rotates about its axis without friction. The cable does not slip on the cylinder when set in motion. The free end

65. ## Physics Classical Mechanics

A light inflexible cable is wrapped around a cylinder of mass m1 , radius R , and moment of inertia about the center of mass Ic . The cylinder rotates about its axis without friction. The cable does not slip on the cylinder when set in motion. The free end

66. ## physics

4. An object is being lifted to the top of building by a light inextensible rope with a tension of 20 N at an acceleration of 1.4 m/s2. Neglecting air resistance, calculate the object’s mass.

67. ## physics

A small circular object with mass m and radius r has a moment of inertia given by I = cmr2. The object rolls without slipping along the track shown in the figure. The track ends with a ramp of height R = 3.0 m that launches the object vertically. The

68. ## Static Fricition

An object of mass 2k is placed on the edge of the floor of a merry go round of radius 4 meters. The coefficient of static friction is 0.4 for the floor and the object. 1.How much work (in joules) is done on the object by the static frictional force to get

69. ## physics

Object A of mass M is released from height H, whereas object B of mass 0.5M is released from height 2H. What is the ratio of the velocity of object A to that of object B immediately before they hit the ground? A. 1 : 2 B. 1.41 : 1 C. 1 : 1.41 D. 1 : 4 E. 1

70. ## physics

Consider the system shown in the figure below with m1 = 30.0 kg, m2 = 13.7 kg, R = 0.110 m, and the mass of the pulley M = 5.00 kg. Object m2 is resting on the floor, and object m1 is 4.60 m above the floor when it is released from rest. The pulley axis is

71. ## physics

An object of mass 10 kg is pulled along a horizontal floor of a distance 3 m. The friction force between the object and the floor is 50 N. What is the minimum work done by the pulling force?

72. ## intro to physics

A small object of mass m = 2.25 kg is released, starting at rest, from a height h above the ground on a ramp inclined at 45.0o (see figure below). The object reaches the bottom of the ramp and enters a loop-the-loop of radius R = 1.25 m. There is no

73. ## Physics

A small circular object with mass m and radius r has a moment of inertia given by I = cmr^2. The object rolls without slipping along the track shown in the figure. The track ends with a ramp of height R = 3.0 m that launches the object vertically. The

74. ## physic

a ball of mass 1oog falls from a height of 5m onto a floor and rebounds to a height of 3m . what energy is lost as a result of the impact on the floor ?

75. ## physic

a ball of mass 1oog falls from a height of 5m onto a floor and rebounds to a height of 3m . what energy is lost as a result of the impact on the floor ?

76. ## physic

a ball of mass 1oog falls from a height of 5m onto a floor and rebounds to a height of 3m . what energy is lost as a result of the impact on the floor ?

77. ## physic

a ball of mass 1oog falls from a height of 5m onto a floor and rebounds to a height of 3m . what energy is lost as a result of the impact on the floor ?

78. ## physic

a ball of mass 1oog falls from a height of 5m onto a floor and rebounds to a height of 3m . what energy is lost as a result of the impact on the floor ?

79. ## physic

a ball of mass 1oog falls from a height of 5m onto a floor and rebounds to a height of 3m . what energy is lost as a result of the impact on the floor ?

80. ## Physics

Two objects with masses 4.90 and 2.10 hang 0.800 above the floor from the ends of a cord 7.20 long passing over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 2.10 object. The heavier object will move .8 m down,

81. ## Physics (Liquids)

I have a question about fluids ok... I've been told that Pressure = (density of fluid) (gravity) (height) ok that's great in all but I don't see how it works... Pressure = (Force perinduclar to area force is acting on)/(Area force is acting on) ok this

82. ## Physics

A rubber ball, with a mass of 40.0 grams is dropped from rest from a height of 1.60 m above the floor. It hits the floor, and then reaches a maximum height of 90.0 cm when it comes back up again. In this problem, use g = 10.0 m/s2. a) The collision with

83. ## physics

A 125 object is taken to a height of 210 above the Earth's surface. Part A What is the object's mass at this height? Part B What is the object's weight at this height?

84. ## physics

What mass could be lifted by the centrifugal force of an object having a mass of 98 g if it were revolving in a horizontal circle, 20cm in diameter, and making 240 revolutions per minute?

85. ## Physics

A 180 kg object is taken to a height of 350 km above the Earth's surface. The object's mass of height is 180 kg. What is the object's weight at this height?

86. ## physical science

A 50.0 kg object is lifted using 4900.0 J. How high is it lifted?

87. ## Physics

I've been working on this problem for close to an hour now and keep getting very wrong numbers... The two objects with different mass (m1 = 5.0 kg and m2 = 3.0 kg) in the Atwood's machine shown in the figure are released from rest, with one object at a

88. ## physics

A pendulum with a bob of mass 30g is lifted to height of 5.00cm above its lowest point and allowed to fall so that collides elastically with a block of mass 20g that rests on a smooth horizontal floor. The block stops 5 seconds after the collision.

89. ## physics 111

A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.600 m. What impulse was given to the ball by the floor? answer in kg·m/s

90. ## physics

When a 6kg mass is lifted from the ground to a height of 12 meters, the gravitational potential energy of the mass increases. Calculate how much will be the increase?

91. ## physics

A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.600 m. What impulse was given to the ball by the floor?

92. ## Physics

A 3 kg object falls from a height of 10 m. What is its velocity just before it hits the ground? How would this problem differ if the object falling from a height of 10 m only had a mass "m"?

93. ## physics

A 3 kg object falls from a height of 10 m. What is its velocity just before it hits the ground? How would this problem differ if the object falling from a height of 10 m only had a mass "m"?

94. ## Phyiscs help 3

The height of a tower is measured by attaching a simple pendulum to its ceiling, whose length is barely enough to stay off the floor. The pendulum is let go from a small angle, and takes 13 s to return to the same location it started from. a.) How tall is

95. ## Physic

A ball of mass 0.7Kg is dropped unto a floor from a height of 5m and rebounds to a height of 3m. Find the impulse on the ball when it hits the floor

96. ## science

An object with a mass of 21 kilograms is lifted through a distance of 7 meters. How much work is done A. 147j B.703n c.15,625N

97. ## physics

if a body of weight 10newton is lifted from the floor to a table 2meters above the floor , calculate the potential energy gain

98. ## Physics

How is work affected when an object is lifted straight up instead of using a ramp? Work will increase. Work will decrease. Work will stay the same. Work will depend on the mass of the object.

99. ## Physics

If a body weight 10N is lifted from the floor to a table 2m above the floor, calculate the potential energy gained. What happens to the energy if the ball falls off the table and hit the floor?

100. ## Physics

A steel ball is dropped onto a hard floor from a height of 1.80 m and rebounds to a height of 1.64 m. (Assume that the positive direction is upward.) (a) Calculate its velocity just before it strikes the floor. m/s (b) Calculate its velocity just after it