A firefighter slides down a pole with constant speed. What can you say about the energy? a. U to Wother : Neither Emech nor Esys is conserved. b. U to K : Emech is not conserved but Esys is. c. U to Uint : Emech is conserved. d. U to Uint : Emech is not conserved but Esys is. e. K to Uint : Emech is not conserved but Esys is.

Q: 9. A 40 kg roller coaster car starts from rest at location A. assuming negligible energy losses to…

A: Law of Conservation of energy tells us that total energy assosiated by a object remains same in case…

Q: d. ma 350 5m 2. A runner weighs 500 N. Initially his speed is 5 m/s. a. If he does 30 J of work,…

A:

Q: You move an object around in a closed path, finishing where you start. During this motion, you…

A: In conservative force field the the work to move an object and close path is zero. Why does if it…

Q: A skier is gliding down a gentle slope at a constant speed. What energy transformation is taking…

A: K denote kinetic energy.Ug denote gravitational potential energyEth denote thermal energy.Skier is…

Q: How much potential energy does a 7.5 kg ceiling fan have with respect to the floor when it is 3.0 m…

A: Given Data :mass of the ceiling fan m = 7.5 kgheight of ceiling fan with respect to floor h = 3 mlet…

Q: What is the work done by the force FD ? A. F,dcos(0°) B. F,dcos(60) C.F,dcos(90°) D. F,dcos(120) M.

A:

Q: An accelerating object of mass m=2 kg is fired with an initial speed v=8 m/s at a starting point. If…

A: Given data: Mass m =2 kg Velocity v=8 m/s2. Final Kinetic energy =268 J

Q: A19.7-N box starting at rest slides down a rough 5.0-m long ramp, inclined at 30° with the…

A: Weight of box is W = Mg = 19.7  N  Assuming g = 10 m/s²  Mass of the box is M = 19.7/10 = 1.9 kg…

Q: 1. A 5.5 kg bird is flying 12 m above the ground. Potential energy of bird is calculated to be ? use…

A: Given that,Mass of bird : m = 5.5 (kg)Height on which bir flying : h =12 (m)Here we need to find the…

Q: A truck travelling at a speed of 50 km/h has a kinetic energy of 600 KJ. If the speed of the truck…

A: Required : The kinetic energy of the truck.

Q: An accelerating object of mass m=18 kg is fired with an initial speed v=9 m/s at a starting point.…

A:

Q: As a woman carries her suitcase up a flight of stairs, she does work against gravity. If the mass of…

A: mass of suitcase (m) = 10 kg Height of stairs (h) = 12 m g = 9.8 ms2

Q: y-4 m/s h2.18m An 84 kg snowboarder is coming down the hill and takes off from a jump. At one point…

A: mass of snowboarder is m = 84 kg The snowboarder is at a height of 2.18 m above the ground.…

Q: p A 1000 kg sports car accelerates from zero to 25 m/s in 7.5 s. What is the average power delivered…

A: Given data: Mass (m)= 1000 kg Initial velocity (u) = 0 m/s Final velocity (v) = 25 m/s Time (t) =…

Q: 2876 kg elephant from Asia (Elephas maximus) pushes against a coconut tree (Cocos nucifera), which…

A: Here elephant is the agent which exerts external force.  There is no conservative as well as non…

Q: The gravitational potential energy of a 500kg elevator at the top of a building, 450m above the…

A: mass=m=500 kg h=450 m PE=mgh g=9.8 m/s^2

Q: An accelerating object of mass m=17 kg is fired with an initial speed v-8 m/s at a starting point.…

A:

Q: A 25g ball is released from rest 80m above the surface of the Earth. During the fall the total…

A: Mass (m) = 25 g Height (h) = 80 m Thermal heat produced (Q) = 15 J

Q: Consider a system consisting a book and the earth, interacting via the gravitation force. What will…

A: We analyse the situation and see how the energy changes.

Q: A box is being pulled across a rough floor with a force P. What can you say about the work done by…

A:

Q: Find the work done in joules by gravity as an object of the mass m=14 kg is raised up at constant…

A: Mass of object m = 14 kg Initial height h1 =34 m Final height h2 = 75 m g = 10 m/s²     Concept…

Q: A 1000 kg car moves with a speed of 20 m/s. Suddenly the driver speeds up to 30 m/s, what is the…

A:

Q: An accelerating object of mass m=12 kg is fired with an initial speed v;-5 m/s at a starting point.…

A: Given: The mass of the body is 12 kg. The initial velocity of the object is 5 m/s. The final kinetic…

Q: Consider holding a heavy chair at arm's length for 3 minutes. At the end of this interval, your arms…

A: we can define work as follows: W=Fd Where,  F is the force W is the work done D is the displacement

Q: Physics 235-Spring Chapter 7 Works The cable of a crane is lifting a 750 kg girder. The girder…

A: Given data: The mass the girder is m = 750 kg The initial speed is u = 0.25 m/s The final speed is…

Q: 1. What is the work done by GRAVITY if a 50kg block is pushed along a 4m horizontal track? a. 1960…

A:

Q: 11. How much work does Amanda's car experience compared to Bertha's? Amanda and Bertha are in a car…

A:

Q: A force F = (3.0N)i + cj acts on a particle as the particle goes through displacement d = (3.0m)î –…

A: The work done is given by  W = F→.d→ where, d is the displacement vector and F is the force vector.

Q: Find the work done in joules by gravity as an object of the mass m=10 kg is raised up at constant…

A:

Q: A moving object is subject to conservative forces only. When its kinetic energy dereases by 10 J,…

A: Answer:- (B) It increase by 10 J  A moving object is subject to conservative forces only. When its…

Q: 1. a brick with mass 30 kg rests a top a 12 m tall wall. What is the brick's gravitational potential…

A: Given: mass of brick, m = 30 kg height of tall wall, h = 12 m

Q: A 50 kg skier leaves the top of a 10 m high frictionless slope (point "a") from rest and reaches the…

A: Given: The mass of the skier is 50 kg. The height of the friction-less slope is 10 m. The speed of…

Q: 13.lf it takes total work W to give an object a speed v and kinetic energy K, starting from rest,…

A:

Q: An accelerating object of mass m=14 kg is fired with an initial speed v-2 m/s at a starting point.…

A:

Q: Which of the following defines the relationship between potential energy (U) and work (W) for…

A: The work done by the conservative force is independent of the path. The work done is equal to the…

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.