A man whose mass is 70 kg walks up to the third floor of a building. This is a vertical height of 12 meters above the street level, a) how many joules of work had he done? b) By how much has he increased his potential energy?, c) If he climbs the stairs in 20 seconds, what was his rate of working in hp?

Q: A student whose mass is 55 kg climbs stairs from the fırst to the third floor of the physics…

A: mass of student (m) = 55 kg vertical distance (h) = 10 m

Q: A single force acts on a 1.4 kg particle-like object in such a way that the position of the object…

A: Speed is given by,

Q: In the figure shown, if the mass (m=5 Kg) is moving with constant speed and traveled a distance d=10…

A:

Q: Suppose the ski patrol lowers a rescue sled carrying an injured skiier, with a combined mass of 97.5…

A: Normal force on sled is mgcosθ Friction force: Substitute mgcosθ for  in above equation. Here; =…

Q: You and your bicycle have combined mass of 80 kg. When you reach the base of the bridge, you are…

A:

Q: A horizontal rope with 15 N tension drags a 25 kg box 2.0 m to the left across a horizontal surface.…

A:

Q: A mass of 8 kg is traveling at a constant 10.8 m/s when a 39 N force, F, starts to act in the…

A:

Q: A mass of 8 kg is traveling at a constant 10.9 m/s when a 32 N force, F, starts to act in the…

A:

Q: 4.0 kg starts at rest from the top of a rough inclined plane of height 10 m as shown in the figure.…

A: Givenm=4 kgh=10 mv=10 m/s

Q: A 2-kg object moving on a horizontal frictionless surface with a speed of 4 m/s is brought to rest…

A:

Q: A particle of mass 6 kg is constrained to move along the trajectory y(x) = -5 x2 + 10 (m).  If the…

A: Given trajectory:     y(x)=-5x2+10 (m)∴dy=-10x      _______(1) Force: F=7 N  (constant) Displacement…

Q: An object with mass ? = 2 ?? is released from rest at a height ℎ = 6 ? from the top of an inclined…

A:

Q: On a table rest 6 books of mass 0.27 kg and thickness 3.8 cm. How much work does it take to stack…

A: Number of books = 6Mass of each book = 0.27 kg Thickness of each book = 3.8 cm = 0.038 m

Q: When released from rest, a 170 g block slides down the path shown below, reaching the bottom with a…

A:

Q: How much work is done on a downhill skier by an average breaking force of 813 newtons to stop her in…

A:

Q: If we know that a force of 5 N is applied on an object while the object moves 2 m, can we determine…

A: Given : F = 5 N d = 2 m

Q: An 0.5 kg object is initially located at a height 2.5 m was kicked vertically upward to a height of…

A: The work done is given by  W = F s cos A  where, F is the force, s is the displacement and A is the…

Q: It takes 3 s for 25 g car to go down a 100 incline for 1 m. ? How much work was done by friction?…

A: Given : Time, t = 3 s mass of car, m = 25 g  = 25*10-3 kg Inclination angle, θ = 100 Distance,x = 1…

Q: Starting from rest, an 1800 kg car rolls down a hill 22 m high. It reaches the bottom going 15 m/s.…

A: Mass of car (m)= 1800 kg Height of hill = 22 m Velocity at bottom of the hill = 15 m/s

Q: A force of 5 pounds is required to hold a spring that is stretched 0.3 feet beyond it's natural…

A: Given:- F = 5 pounds x = 0.3 ft To find:- Work done in order to stretch the spring 1.1 feet beyond…

Q: A crate that has a mass of 20 kg is raised 10 meters above the ground. How much potential point…

A: Potential energy comes due to height only. Its value is given by  P.E.- mgh  m - mass of the object…

Q: Find the work done in joules by gravity as an object of the mass m310 kg is raised up at constant…

A: Mass = 10 kg  Displacement = h2 - h 1 = 80m - 22 m =  58 m As we know Workdone  is given by W  Which…

Q: A factory worker pushes a 40 kg box a distance of 5 meter along a level floor, at constant speed, by…

A: Given Data: The mass of the box is, m = 40 kg. The displacement is, s = 5 m. The coefficient of…

Q: A man wishes to pull a crate 15m across a rough floor by exerting a force of 100 N. The  coefficient…

A: Assume that the angle between horizontal and the force applied by the man be θ. Draw the free-body…

Q: A body of mass 20 kg is lifted up through a height of 4 m. How much work is done? (take g = 9.81…

A: Given data,                    Mass, m = 20 kg                   height lifted, h = 4 m         Only…

Q: An object of mass 4.34 kg starts at the top of a hill of height 2 m. When it rolls down to the…

A: The solution is given below

Q: A tug boat pulls a ship with a constant net horizontal force of 5000N and causes the ship to move…

A: GIVEN: Force, F=5000 N Displacement, d=3 km=3000 m CONCEPT: Work done is product of force and…

Q: A force of 1300 lb compresses a spring from its natural length of 18 in. to a length of 10 in. How…

A: Given Applied force is F=1300 lb Compression of the spring in the first case is ∆x1=18-10 in=8 in…

Q: As an object moves from point A to point B only two forces act on it: one force is conservative and…

A:

Q: While training for breeding season, a 460 gram male squirrel does 29 pushups in a minute, displacing…

A: Given:- While training for breeding season, a 460 gram male squirrel does 29 pushups in a minute…

Q: Is the work done by the applied force positive or negative when a heavy body is lowered to the…

A: Let h be the height at which the body is initially, F be the applied force, W be the work done by…

Q: In the figure shown, if the mass (m=7 Kg) is moving with constant speed and traveled a distance d=10…

A:

Q: If a person lifts up a heavy box weighing 500 N a distance of 20 cm off the ground, but then gets…

A: We have a box which has a weight of F=500 N that is lifted up to a height h=20 cm=0.2 m off the…

Q: 4 m 3 m Your mass is 50 kilograms, and you take a ride down the slide shown in the picture (with a…

A:

Q: Spiderman, whose mass is 80.0 kg, is dangling on the free end of a 12.0-m-long rope, the other end…

A: Mas, m = 80 kg  Length of rope, l = 12 m

Q: A bag of wheat weighs 170 kg. To what height should it be raised so that potential energy is 8614 J?…

A: Given data :                    Acceleration due to gravity    =    g                    Potential…

Q: A man pushes a 15 kg box from rest to a speed of v, doing 200 J of work in the process. During this…

A: Work = FS  F = Work/S = 200/6 = 33.33 N  Now , a = F/m = 33.33/ 15 = 2.22 m/s^2 Now,  by  V^2 =…

Q: A 0.600-kg particle has a speed of 2.00 m/s at point Ⓐ and kinetic energy of 7.50 J at point Ⓑ. What…

A:

Q: You pick up a barbell with weights (total mass: 100.0 kg) from the ground to approximately 0.800 m…

A: Mass of the barbell is m = 100 kg Height of the barbell after lifting it is H = 0.800 m

Q: Find the work done in joules by gravity as an object of the mass m 5 kg is raised up at constant…

A: Mass of object m = 5 kg Initial height h1 = 26 m Final height h2 = 69 m g = 10 m/s²

Q: A force of 100N stretches a spring one meter beyond its natural length. How much work does it take…

A: When a force is applied to a spring, then it will be stretched according to the amount of force…

Q: You and your bicycle have combined mass of 80 kg. When you reach the base of the bridge, you are…

A:

Q: The 2018 Pyeongchang gold medalist winner in a large hill ski jumping discipline, Kamil Stoch,…

A: Applying conservation of energy to calculate the final speed of the man…