Discuss whether any work is being done by each of the followingagents and, if so, whether the work is positive or negative: (a) a chicken scratching the ground, (b) a person studying,(c) a crane lifting a bucket of concrete, (d) the force of gravityon the bucket in part (c), (e) the leg muscles of a person inthe act of sitting down.

Q: A box of mass 7.5 kg has an initial velocity of vi down an inclined planed that is at an angle of…

A: Given Data: The mass of a box is, m=7.5 kg The angle of inclination is, θ=17° The coefficient of…

Q: (a) Calculate the force needed to bring a 900 kg car to rest from a speed of 80.0 km/h in a distance…

A: Given: The mass of the car is 900 kg. The speed of the car is 80 kmh=22.22 m/s. The distance covered…

Q: A 1.5-tonne vehicle accelerates to 90 miles per hour in 10 seconds. Calculate the force exerted by…

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Q: (a) Calculate the work done (in J) on a 1700 kg elevator car by its cable to lift it 41.0 m at…

A:

Q: (a) Calculate the force needed to bring a 1100 kg car to rest from a speed of 90.0 km/h in a…

A: mass of car = 1100 kg initial speed = 90km/hr  = 90 * 5/18  = 25 m/sfinal speed = 0 m/sdistance =…

Q: A 3.2-tonne vehicle accelerates to 140 miles per hour in 50 seconds. Calculate the force exerted by…

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Q: The work done by the external forces on a system equals the change in (a) total energy (c) potential…

A: We know the Work Energy Theorem states that  The work done by all the forces i.e. internal,…

Q: A box of mass 7.5 kg has an initial velocity of vi down an inclined planed that is at an angle of…

A:

Q: Calculate the force (in N) needed to bring a 850 kg car to rest from a speed of 90.0 km/h in a…

A:

Q: a)Calculate the force (in N) needed to bring a 800 kg car to rest from a speed of 95.0 km/h in a…

A:

Q: A luge and its rider, with a total mass of 81.0 kg, emerge from a downhill track onto a horizontal…

A: Mass = 81kg Initial Speed = 38m/s Acceleration = -2.40m/s2

Q: If the force and length traveled by the objects are given as scalar while the angle between them is…

A: Given: The force and traveled distance in scalar form. The angle between force and displacement.…

Q: (a) Calculate the force (in N) needed to bring a 1000 kg car to rest from a speed of 80.0 km/h in a…

A: Given data Mass (m) = 1000 kg Final Speed (v) = 0 Initial speed (u) = 80 km/h = 80*5/18 m/s u =…

Q: A buffalo is capable of producing 250 watts of power. If it pulls a plow with a 50-kg force,…

A:

Q: (b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00…

A: (a) Given that Mass of car(m) =800kg Speed( v) =85 km/h=85*5/18 m/sec Distance( d) =125m

Q: The work required to stretch a certain spring from an elongation of 4.00 cm to an elongation of 5.00…

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Q: (a) Calculate the force (in N) needed to bring a 950 kg car to rest from speed of 90.0 km/h in a…

A:

Q: For the cases shown in Fig. , the object is released from restat the top and feels no friction or…

A: During free fall the acceleration acting on the mass will be acceleration due to gravity g=9.8…

Q: A 3.5-tonne vehicle accelerates to 110 miles per hour in 30 seconds. Calculate the force exerted by…

A: If a particle is set motionless at a certain location and gains some speed as a result of the…

Q: An object has a mass of 200kg initially moving along a horizontal surface with a velocity if 15ms is…

A:

Q: (a) Calculate the force needed to bring a 850 kg car to rest from a speed of 95.0 km/h in a distance…

A: Force is an acceleration mass multiply by the mass of the object.    Apply the equations of motion…

Q: miles per hour

A:

Q: (4) Need to know the weight of the block to answer. (5) Need to know the coetficient of friction a,…

A: The equation for the work done is,

Q: (a) Calculate the force needed to bring a 1050 kg car to rest from a speed of 80.0 km/h in a…

A: a)The required force from work energy theorem,

Q: The final and initial energies of the body represents the increase in energy and equal to the work…

A: According to work energy theorem,   Work done by the force= Change in energy…

Q: Calculate the force needed to bring a 950 kg car to rest from a speed of 95.0 km/h in a distance of…

A:

Q: Calculate the work W against gravity required to build a right circular cone of height 3 m and base…

A: Disclaimer: “Since you have asked multiple question, we will solve the first question for you. If…

Q: Soap bubble of radius (1/√√) c cm is expanded to a bubble of radius (2/√√) c π cm. If the surface…

A: Given-T=30 dyne/cmr=1π cmR=2πcm

Q: (a) Calculate the force needed to bring a 800 kg car to rest from a speed of 80.0 km/h in a distance…

A: mass = 800 kg u = 0 m/s (final speed)initial speed = 80km/h  = 80 * 5/18  = 22.22 m/sd = 115 m

Q: An8.5-kg block is pushed along a horizontal rough surface by a 40-N forceinclined at 20° with the…

A:

Q: A ball of mass 0.310 kg is thrown upward, rising 12.1 m above the point at which it was released…

A: Mass of the ball = 0.310 kgheight achieved by the ball H = (12.1+0.215) m = 12.315 mHand moves by…

Q: The work required to stretch a certain spring from an elongation of 4.00 cm to an elongation of 5.00…

A: Given data: Elongation of length x1=4.00 cm                                  x2=5.00 cm Energy =11J…

Q: A hummingbird hovers by exerting a downward forceon the air equal, on average, to its weight. By…

A: Given,

Q: constant velocity a distance 8.0 m along a 30° incline by the horizontal force F → . The coefficient…

A: mass of crate ,m=40 kgdistance moved on inclined =8 mangle of inclination =30°  µk = 0.40

Q: when a 4.00-kg object is hung vertically on a certain light spring that obeys Hooke's law, the…

A: Given that- M=4.00kg Spring stretched(x) =2.50cm=2.50*10^-2 To determined that - a) how far will the…

Q: A5.2-tonne vehicle accelerates to 130 miles per hour in 60 seconds. Calculate the force exerted by…

A: As per Newton's second law of motion, the acceleration of an object will depend on its mass and the…

Q: Explain why a diver pulls his hands and legs close to his body when jumping from a diving board into…

A:

Q: A 5.2-tonne vehicle accelerates to 130 miles per hour in 60 seconds. Calculate the force exerted by…

A: Given that             The mass of the vehicle is (m) = 5.2 tonne                   1 tonne = 1000kg…

Q: (a) If force and displacement have the same direction, the work done is ________________. (b) If…

A:

Q: If a constant force F is applied to an object, and the resulting movement of the objectis…

A: The work is done by an object when a force acts on it over a distance. The mathematical form of work…