A 0.14-kg pinecone falls 16 m to the ground,where it lands with a speed of 13 m>s. (a) With what speed wouldthe pinecone have landed if there had been no air resistance? (b) Didair resistance do positive work, negative work, or zero work on thepinecone? Explain.

Q: Can you expend energy without doing any work? Given an example.

A:

Q: 1) A steel ball of mass 5.2 g is fired vertically DOWNWARD from a height hof 18 m with an initial…

A: Given   mass of steel ball = 5.2 g initial speed = vo = 14 m/s    (downward direction) height = 18…

Q: A ski boat moves with constant velocity. Is the net force acting onthe boat doing work? Explain.

A: A ski boat

Q: Provide an example of a situation that would help explain the concept of "zero work", in regards to…

A: In physics the work may be defined as the dot product of force and displacement. By dot product of…

Q: Suppose a 1400-kg elevator car is lifted a distance 42 m by its cable at a constant speed, assuming…

A: The objective of the question is to calculate the total work done on the elevator. The work done on…

Q: In physics, what conditions must be satisfied if work is to be done?

A:

Q: The work done by a nonconservative force on an object depends on the path taken from the initial…

A:

Q: A 53.2-kg skateboarder starts out with a speed of 2.33 m/s. He does 85.8 J of work on himself by…

A:

Q: The 0.14 kg tree topper is accidentally knocked off of a Christmas tree giving it an initial speed…

A:

Q: A 100N block is being pulled along the surface of a table by a 50.0N force in a direction 35 degrees…

A: Given that,Force on block : FB = 100 (N)Force on table :  FT = 50 (N)Angle : θ = 35°Coefficient of…

Q: (a) What is the efficiency of an out-of-condition professor who does 2.10 x 105 J of useful work…

A: A) work = 2.1 × 105 J      Food Energy = 500×1000 cal                             = 21× 105 J  B)…

Q: weight lifter hold 900N over his head. Is he doing work on weight? EXPLAIN.

A: The work done by the weight lifter can be given as, W=F.d Here, F denotes the force on the object is…

Q: ETC - CIMS - 1. A student of mass 50 kg caries a bag weighing 4000g from the ground floor to his…

A: The solution is given below

Q: Problem 6: A toy cart is pulled a distance of 6.2 m in a straight line across the floor. The pulling…

A: Given data :- Displacement (along the floor) d = 6.2 m Pulling force Fp = 19.2 N Angle θ between…

Q: Give 5 situations in which work is not done on it.

A:

Q: The net work done on a certain object is zero. What can you sayabout its speed?

A: Net work done is zero

Q: A body of mass 30 kg is at rest. A force of 5 N is applied on it. Calculate the work done in first…

A: Given that:-Mass, m=30 kgInitial velocity, v=0m/sForce, F=5NWe know…

Q: Identify a case where an object is moving over a surface with friction, but the frictional force…

A: When the object moves in a pure rolling motion, the work done by the friction will be zero.

Q: a-) Determine the work a hiker must do on a 15.0-Kg backpack to carry it up a hill of height…

A: a)Work done by hiker  w=mgh=15*9.81*10=1471.5J b)Work done by gravity  W=-mgh=-15*9.81*10=1471.5J

Q: A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of…

A:

Q: Cite an example wherein  force exerted on a body does no work. Explain.

A: Work done is defined as the product of force, displacement and cosine of angle between force and…

Q: . Is it possible to do work on an object that remains at rest?

A: Work

Q: A roller coaster is pulled up to a point A, 30.0 m above the ground where it and its screaming…

A:

Q: Ffr = 20 N Fapp 200N %D

A: Given, Fapp=200N Ff=20N The net force is in the forward direction (towards Right)=200-20 Net…

Q: A 996 kg car is travelling at a velocity of 15.4 m/s.  How much work must be done on the car by the…

A: Given: The mass of the car is 15.4 m/s. The mass of the car is 966 kg. The final velocity of the car…

Q: Is it possible that the work done by a force is negative? Give an example.

A: Yes it is possible for work done by a force to be negative.If the displacement happened in the…

Q: A 2-kg car accelerates uniformly from rest to a speed of 10 m/s in the first 5s (frictionless…

A: Given that,Mass of car : m = 2 (kg)At t = 5 (sec), v = 10 (m/sec)Now,Here we can apply the eqn of…

Q: he work done by a conservative force around a closed path is nonzero.  T  F ??

A: A conservative force is a force done in moving a particle from one point to another, such that the…

Q: Which do you think requires more work: moving up stairs at a slow speed (ex: walking) or moving up…

A: We know the  formula of work  W= F × S Where F =Force  S= displacement

Q: A crane lifts a 650 kg beam vertically upward 6.6 m and then swings it westward 18 m. How much work…

A: