Answer: Work done, W = T.S = Fs cos θ So there shall be no change in the speed of the trolley. For k = 0.5 Nm-1 , the graph of V (x) versus x is shown in Fig. The block moves 10 cm down the incline before coming to rest. C. 90 kJ. =1/2mv2 + 0 =1/2 mv2 A man has pulled a cart through 35m by applying a force of 300 N.Find the work done by the man.Solution:Given data: Distance =S =35 mForce =F=300 NWork = ?Formula: Work = Force × distanceW= F × SW = 35 × 300W=10500 J (c) False, the work done during the motion of a body over a closed loop is zero only when body is moving under the action of a conservative force (such as gravitational or electrostatic force). Exam Questions – Work, energy and power. =>p0=(30 x 103 x 9.8 x 40)/900=13070 watt NCERT Solutions for Class 11 Physics Chapter 6 Work Energy and Power are part of Class 11 Physics NCERT Solutions. Answer: (a) Power used by family, p = 8 KW = 8000 W Show that a particle of total energy 1 J moving under this potential must ‘turn back’ when it reaches x = ± 2 m. Known : Power (P) = 300 Watt = 300 Joule/second. (d) True, usually in an inelastic collision the final kinetic energy is always less than the initial kinetic energy of the system. 14. Answer: Question 6. (b) Fat supplies 3.8 x 107J of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. Question 6.3. 2. Would your answer be different if the elevator were stationary? Distance moved in each half of the journey, S=500/2= 250 m. The bob transfers its entire momentum to the ball on the table. A body is initially at rest. (i), the man walks 2 m carrying a mass of 15 kg on his hands. 27. (d) Change in kinetic energy of the body in 10 s and interpret your results. What is the final speed of the trolley? 6. of the system is Is the collision elastic or inelastic? the concept of energy and the conservation of energy. Question 6. 22. (b) Kinetic energy, because friction does its work against the motion. Determine the work done on the car. Physics Practice Problems: Work and Energy Page 2 of 5 Power: 20. Solution : Work : W = m g h = (60)(10)(5) = 3000 Joule. Misfortune occurs and Renatta and her friends find themselves getting a workout.They apply a cumulative force of 1080 N to push the car 218 m to the nearest fuel station. Point out the correct alternative: A. Also, indicate the minimum total energy the particle must have in each case. (d) If the potential energy of two billiard balls depends only on the separation distance between their centres, is the collision elastic or inelastic? Fat used up by the dieter =1kg/(0.76 x 107) x 49000 = 6.45 x 10-3 kg. (1 hp = 746W. Answer: (a) False, the total momentum and total energy of the system are conserved. (d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/total energy of the system of two bodies. After collision, K.E. (i) t1/2 (ii) t (iii) t3/2 (iv) t2 Period (T) = 5 minutes = 5 (60 seconds) = 300 seconds. Introduction to work and energy Our mission is to provide a free, world-class education to anyone, anywhere. + P.E. Part (b): Edexcel Mechanics M2 January 2012 Q3b : ExamSolutions - youtube Video. h = 40 m ; n= 30% Embedded content, if any, are copyrights of their respective owners. Download Work Energy Power Problems with Solutions.pdf (497 KB) Equella is a shared content repository that organizations can use to easily track and reuse content. Which of the following potential energy curves in Fig. Question 6. Given θ1 = 30°, θ2 = 60°, and h = 10 m, what are the speeds and times taken by the two stones? A high-speed camera records this even... Problem#1 A ballet dancer has a moment of inertia of 4 kg.m 2 when his arms reach his body and 16 kg.m 2 when his arms are stretched. (e) Work done is negative, because the resistive force of air opposes the motion i.e., θ = 180°. A=4000 W/200 Wm-2 =200 m2 .-. Home › Energy and Energy Transfer Problems and Solutions › Problems and Solutions Work Power and Energy. What is the work done by this force in moving the body a distance of 4 m along the z-axis? Answer: Here, volume of water = 30 m3 ; t = 15 min = 15 x 60 = 900s v = 0 + at = at A particle of mass 0.5 kg travels in a straight line with velocity u = a x3/2, where a = 5 m-1/2 s-1. 23. When the two billiard balls touch each other, P.E. (a) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket, work done by applied force = 7 x 126 J = 882 J (ii), force is applied along the horizontal and the distance moved is also along the horizontal. Momentum of electron + momentum of proton = momentum of neutron A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down with a uniform speed of 7 ms-1. b) How many horsepower (hp) output must a motor have to perform this task? 2) View Solution. Whe... Problem#1 The electric flux through a certain area of a dielectric is (8.76 x 10 3 Vm/s 4 ) t 4 . What is the work done by the gravitational force on the drop in the first and second half of its journey?

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