5) A particle of mass 200g is thrown vertically upwards with a speed of 10ms-1, the work done by force of gravity while the particle goes up is given by a) 15 J b) -15 J c) 10 J d) -10 J e)5J

Q: A bag of wheat weighs 4 kg. To what height should it be raised so that potential energy is 12 J?…

A: Given data,    Acceleration due to gravity  =  g    Potential energy  =  P.E    Mass of the bag  =…

Q: Using energy considerations, calculate the average force a 60.0-kg sprinter exerts backward on the…

A:

Q: A valuable antique chest which weighs 1400 N is to be moved into a truck. To get the chest from the…

A:

Q: 10-A person lifted a 10.0-kg bucket from thebottom of a 10-m deep well. The bucket startedfrom rest…

A: mass = 10 kg  Height = 10 m  u initial velocity = 0 m/s v = 1 m/s we need to calculate work done

Q: 5. When a ball rises vertically to a height h and returns to its original point of projection, what…

A:

Q: A 1300 N crate rests on the floor. How much work is required to move it at a constant speed. i) 4 m…

A: weight of crate = 1300 N frictional force along floor = 230 N distance moved along floor = 4 m…

Q: A 1.2-kg mass is projected up a rough circular track (radius = 0.80 m) as shown. The speed of the…

A: Given Mass = m = 1.2 kg Velocity of object at A = VA = 8.4 m/s Velocity of object at B = VB = 5.6…

Q: Does it take any work to push an object that does not move? Explain.

A: Work done is defined as product of displacement and force acting along displacement.

Q: A container with a mass of 5 kg is lifted to a height of 8 m. Hoy much work is done by the…

A:

Q: The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.

A: Write the expression for the work done.

Q: Calculate the work done in lifting a 300 N weight to a height of 10 m with an acceleration 0.5 ms.…

A:

Q: 30.0 m

A: Given:mass, m = 75 kg

Q: Is work done whenever a force is exerted? Explain.

A: Force F is applied to body to displace it from one position to another position, then work done on a…

Q: 28. How much work is done by the boy pulling his sister 30.0 m in a wagon as shown below? Assume no…

A:

Q: -The force F = (3i - j) N acts on a particle, causing a displacement of Ar = (3i + 2j) m. Find the…

A: Work done on the particle by this force W=F→·d→=3i-j·3i+2j=3i·3i+-j·2j=9-2 J=7 J

Q: A 2.9 kg bucket of water is lifted vertically 1 m How much work against gravity is done? Use g = 9.8…

A: Given : m = 2.9 kg h = 1 m g = 9.8 m/s2

Q: A boxed 10.0-kg computer monitor is dragged by friction 5.50 m up along the moving surface of a…

A: Given: The mass of the computer monitor is 10 kg. The displacement of the object along the plane is…

Q: Section 6.1 Work Done by a Constant Force 1. The same force F pushes in three different ways on a…

A:

Q: 4. (II) A 1200-N crate rests on the floor. How much work is required to move it at constant speed…

A: weight of crate (w) = 1200 N frictional force (f) = 230 N

Q: The question is in the image below.

A:

Q: A mechanic pushes a 3.00 x 10° kg car from rest to a speed.of v, doing 4650 J of work in the…

A: (a) Work done is equal to change in kinetic energy W=12m∆v2   =12mv2               (object started…

Q: 3. (II) How much work did the movers do (horizontally) push- ing a 46.0-kg crate 10.3 m across a…

A:

Q: What is the work required by friction to stop a 6.7 kg block sliding on a table if it initially has…

A:

Q: How much work is done by the boy pulling his sister 29.0 m in a wagon as shown below? Assume no…

A:

Q: 1. If person holds a weight for an hour, why would physicists say that no work was done?

A:

Q: -2- A 5.00-kg block is acted by a horizontal force that is varying with the distance traveled by the…

A: Mass, m = 5 kg Distance, d = 6 m

Q: If you walk 5.0 m horizontally forward at a constant velocity carrying a 10-N object, the amount of…

A: The amount of work by you is Zero.

Q: How can we ignore the self-potential energy when doing a work-energy problem or an…

A:

Q: Suppose that 3 of work is needed to stretch a spring from its natural length of 30 cm to a length of…

A: Given: The work done d is 3 J from its natural length of 30 cm to 45 cm.   To find: The work is done…

Q: How much work is done in completing one rep of 50 kg on a bench press ( holding the bar, lowering…

A: Expression for work done -  W=F×S ..... (1)Where, W =Work done F =Applied force S =Displacement…

Q: What can be said about the speed of a particle if the net work done on it is zero? explain briefly

A: Given  Net work done on particle is zero            Wnet = 0    According to work energy theorem ,…

Q: Describe a situation in which a force is exerted for a long time but does no work. Explain.

A: We consider a situation when an object lifted at height h is displaced a distance x.

Q: Calculate the work you must do to accelerate 2 kg from rest to 1 m/s. Answer in Joules.

A: Given: The mass of the object is 2 kg. The initial speed of the object is 0 m/s. The final speed of…

Q: A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m) as shown. The speed of the…

A: It is given that,

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

A:

Q: Question 18) A box is lifted vertically 1.5 m and is then held there. The box has a weight of 100 N.…

A: solution Work is done in holding the box in this position B:w=?

Q: 90-kg sprinter accelerates from rest to a speed of 11.0 m/s in 5.2 s. (a) Calculate the mechanical…

A: mass of sprinter =m = 90 kg initial velocity =V0= 0 m/s final speed = V = 11 m/s time = t =5.2 s

Q: During a fitness test for the US marines, Jacob and Janelle ran up a hill. Jack is 1.5 times as…

A: Let Mass of janelle be m. Given mass of jack=1.5×m( mass of janelle) Let time taken by jack be t.…

Q: A 2 kg mass is projected down a rough ( )circular track (R = 2 m) as The speed of the mass at point…

A: mass = m= 2 kg height = h = 2 m speed at point A = VA= 4 m/s speed at point B = VB= 4 m/s

Q: So I'm having a hard time in calculating the power at t=9s

A:

Helmholtz Free Energy

The Helmholtz free energy is a thermodynamic potential used to calculate the measure of useful work from a closed system. This system is kept at constant temperature and volume. German physicist Hermann Helmholtz introduced this concept in 1882.