A leaky bucket which initially has 20 L of water and leaks at a constant rate is hanging from a 60 m rope. The rope weighs 3 kg in total. A person starts to pull up the bucket at constant speed, and when all the rope has been pulled up, the bucket has 8L of water left. How much work is done in pulling the bucket up?

Q: A 7.80-g bullet moving at 690 m/s penetrates a tree trunk to a depth of 6.20 cm. (a) Use work and…

A: Mass of bullet (mb)=7.8 g Initial speed of the bullet (u)=690 m/s Penetration in trunk (d)=6.2 cm

Q: You pull a cart by its handle with a force of 16 N across a frictionless surface with constant speed…

A:

Q: A hunter notches a 0.05 kg arrow in a compound bow and draws the arrow back to set the bow. The…

A: Mass of the arrow , M = 0.05 kg  Work done in setting the arrow , W = 50 J  To find = Speed of the…

Q: Kangaroos have very stout tendons in their legs that can be used to store energy. When a kangaroo…

A: According to the law of conservation of energy, for an isolated system energy can be destroyed nor…

Q: Robin Hood pulls the string of his bow backwards 0.6 m with a force of 170 N. The mass of the arrow…

A: We know work done(W) = change in kinetic energy. Here the final speed of arrow is zero. let the…

Q: rmine the number of Calories required to power the heart for one day, given that 1 Calorie equals…

A: (a) Suppose under normal conditions the human heart converts about 13.5 J of chemical energy per…

Q: A pump is required to lift 800 kg of water per minute from a well 16.0 m deep and eject it with a…

A: Given: Weight of water: m=800 [kg] Height: h=16 [m] Speed of ejecting out: v=15 [m/s]

Q: A 10 kg sled with a kid inside is sliding down a hill on dry snow. At point A, it has a speed of v=…

A:

Q: Everyday, the heart uses enough energy to drive a truck 20 miles. In a lifetime, that is equivalent…

A: The average power of engine of a truck is about 150 Hp which is equal to 746×150= 111900 joule per…

Q: A bucket holding 17kg of sand is being lifted by a weightless rope. The bucket leaks 0.5kg of sand…

A:

Q: The temperature of a plastic cube is monitored while the cube is pushed 2.3 m across a floor at…

A: Given Data:- Horizontal force is F=13 N The plastic cube is pushed by a distance d=2.3 m. Increase…

Q: The mechanical power of a cyclist pedaling at a constant speed of 7.5 m / s is 152 W. a) What is…

A: Velocity = 7.5 m/s Power= 152 w Frictional force ? Power = force . Velocity Force = power / velocity…

Q: When water flows through river rapids or over a waterfall, it experiences a decrease in height and…

A: Basic Details The gravitational potential energy of the water depends on the height of the…

Q: A lawn roller is pushed 15 meters by a force of 100 N. If the person has used 85 W, how long did it…

A:

Q: A woman lifts a single shopping bag that weighs 100 N through a height of 30 cm She then walks 3.0…

A: For work-done the displacement should be in direction of applied force or load.

Q: How much work must be done on a heavy object to lower it from a height where it has 4000 Jof GPE to…

A: Initial gravitational potential energy = 4000 J Final gravitational potential energy = 2200 J…

Q: A 7.80-g bullet moving at 660 m/s penetrates a tree trunk to a depth of 5.80 cm. (a) Use work and…

A:

Q: A motor pumps 500 kg of water at a constant speed from street level to a height of 30 m to fill a…

A:

Q: A 70-kg professional cyclist is climbing a mountain road at an average speed of 23.5 km/h. The road…

A:

Q: A 10 cm-long spring is attached to the ceiling. When a 1.7 kg mass is hung from it, the spring…

A: Mass of the object, Natural length of spring  = 10 cm length of spring after stretch = 16 cm

Q: A spring has a spring constant k. When the spring is stretched through 1 cm, the potential energy…

A: To write the expression for potential energy is,        U=12kx2

Q: Explorers in the jungle find an ancient monument in the shape of a large isosceles triangle as shown…

A: Write the expression for the volume of the monument and substitute the corresponding values.…

Q: A 1 kg block is pushed up a 300 inclined surface with initial velocity of 10 m/s. After the block…

A:

Q: In calculating the work W necessary to stretch a spring from its natural length of 8 centimeters to…

A: SOlution: To calculate the work done on spring to stretch.

Q: A 88 kg block is pulled at a constant speed of 3.5 m/s across a horizontal floor by an applied force…

A: Given data: Mass (m) = 88 kg Constant Speed (v) = 3.5 m/s Force (F) = 139 N Angle between force and…

Q: A leaky 10-kg bucket is lifted from the ground to a height of 12 m at a constant speed with a rope…

A:

Q: A pump is required to lift 800 kg of water per minute from a well 13.8 m deep and eject it with a…

A: Here the mass of water lifted per minute  = 800 kgdepth of well = h = 13.8m the ejected speed of the…

Q: ter leaves the h

A: Given: Height is 31 m Diameter is 4 cm Mass is 1000 kg

Q: A bucket of water of mass 20 kg is pulled at constant velocity up to a platform 30 meters above the…

A: Write the given values with the suitable variables. m=20 kgh=30 mt=18 min Here, m, h, and t are the…

Q: A 69.7-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then…

A: We have givenMass of boy = 69.7 kg Initial speed (u)= 1.60 m/s  Droping  height (h)= 1.64 mFinal…

Q: A 7.80 g bullet is initially moving at 660 m/s just before it penetrates a block of wood to a depth…

A: The bullet is stopped by the friction force. This means that the loss in kinetic energy is due to…

Q: Explorers in the jungle find an ancient monument in the shape of a large isosceles triangle as shown…

A:

Q: An 8.0-cm-long spring is attached to the ceiling. When a 2.3 kg mass is hung from it, the spring…

A: The mass of the object, m=2.3 kg   The weight of the object attached to the spring, F=mg=2.3 kg9.8…

Q: A 71.6-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then…

A:

Q: A leaky bucket, which weighs 5 N empty and initially has 40 N worth of water in it, is lifted into…

A: Given

Q: Truck suspensions often have "helper springs" that engage at high loads. One such arrangement is a…

A:

Q: A 2000 Kg car is moving at 54 km/hr behind a truck. In order to pass the track, the car changes its…

A: Given:  mass of car, m = 2000 kg  initial velocity, u = 54 km/h = 15 m/s final velocity, v = 72 km/h…

Q: The basis of muscle action is the power stroke of the myosin protein pulling on an actin filament.…

A: Given that, Input work, It produces a displacement of 10 nm against a force of 1.0 pN. We know…

Q: A railroad locomotive accelerates a 95,000-kg railcar from 10 m/s to 25 m/s in 90 seconds. What was…

A: The initial velocity u=10 m/s The final velocity v=25 m/s Mass of the locomotive m=95000 kg The…

Q: A 3 kg block is sliding across a horizontal surface.  The initial speed of the block is 4 m/s, but…

A:

Q: A spring with a spring constant of 11 N/m is stretched from equilibrium to 2.9 m. How much work is…

A: