What is the efficiency of an out-of-condition professor who does 2.00 ✕ 105 J of useful work while metabolizing 510 kcal of food energy How many food calories would a well-conditioned athlete metabolize in doing the same work with an efficiency of 20%?  kcal

Q: A 55 kg packing crate is pulled with constant speed across a rough floor with a rope that is at an…

A: Given: The mass of the packing crate is 55 kg. The tension in the rope is 125 N. The angle between…

Q: A weight lifter lifts a 350-N set of weights from ground levelto a position over his head, a…

A: When the weightlifter lifts the weight with a constant velocity, the net force on the weights will…

Q: A block of wood is compressed 2.00 nm when inward forces of magnitude 141 N are applied to it on two…

A:

Q: A 23.5 kg sled is pulled 14.3 m along a flat section of snow by a force of 70.8 N [23.0° above…

A:

Q: At what average power must the engine of a car with a mass of 1.7 × 10³ kg, moving on an 11% slope…

A: SOlution: given that m = 1.7 × 10³ kg v = 31 km/hr =8.61 m/s slope =11%

Q: A skier of mass 64 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to…

A: Given:Mass of the skier, m = 64 kgSlope = 30 degreesConstant velocity of the skier upto the slope, v…

Q: A record for stair climbing was achieved by a man who raced up the 1600 steps of the Empire State…

A: Given data from question,  Number of steps = 1600 Height = 320m Time taken = 10.2min Weight of man =…

Q: A log is pushed 2 m by a 5 N force. The opposing frictional force is 0.53 N. How much work is done…

A: Work: The work done by any force is the product of the force with the displacement of the object.…

Q: A 53.4-kg skateboarder starts out with a speed of 1.76 m/s. He does 80.8 J of work on himself by…

A: Given:- mass of the skateboarder = 53.4 kg  The speed of the skateboarder = 1.76 m/s  He does the…

Q: A 0.075 frisbee is thrown with an initial speed of 12 m, and an initial height of 1.1 m, when it has…

A: Write the given values with the suitable variables. m=0.075 kgu=12 m/sh=1.1 mv=10.5 m/sH=2.1 m Here,…

Q: A shopper pushes a grocery cart 19.2 m  on level ground, against a 16.3 N frictional force. The cart…

A: W=work done by pushing force=friction work done +increase in KE

Q: A block of wood is compressed 2.00 nm when inward forces of magnitude 132 N are applied to it on two…

A: GivenMagnitude of inward force,F=132 NBlock is compressed to distance, x=2.00 nm

Q: A 8.0kg box slides down a 2.0m long surface that is inclined at 53° below the horizontal. The…

A:

Q: A block of mass 12kg is being pulled to the right by a rope that makes a 37 degree angle with the…

A: Given data: Mass (m) = 12 kg Angle (θ) = 37° with the horizontal Displacement (d) = 21 m Tension…

Q: At a constant velocity, you are pulling a 10 kg object with a horizontal force P. How much work is…

A: Given: Mass of object, m=10 kg Displacement, s=60 cm kinetic frictional coefficient, μk = 0.58   To…

Q: A 1700 kg car coasts on a horizontal road with a speed of 23 m/s. a) How much work must be done by…

A: Given data: Mass (m) = 1700 kg Initial velocity (v0) = 23 m/s Final velocity (vf) = 17 m/s Required:…

Q: If a work of 0.5 Joule is needed to stretch a spring a distance x = 0.05 m. What is the force…

A: Work done is W = 0.5 J Extension in the spring is x = 0.05 m

Q: Find the work done by (4 N) frictional force, in removing an object for (15 m) along horizontal…

A: Given data, Friction Force (F)= 4 N Horizontal Distance (d)= 15 m

Q: Under what conditions is the work done i) maximum and ii) minimum?

A: Given:-             Under the condition for the work done  i. maximum ii. minimum is following…

Q: A 3.2-kg bucket of water is lifted vertically 2 m How much work against gravity is done?  Use g =…

A: Mass of bucket of water = 3.2 kg  Vertical distance = 2 m  g = 9.8 m/s2

Q: Procopio is driving a car (m = 1000 kg) at v7 = 11.11 m/s when he stepped on the brakes. The car…

A: The work done by the force F as the car traveled a distance s before stopping is W=F·s

Q: In one series of aircraft exercises, a pilot went down 370 m after ejecting from his jet plane and…

A: Given:distance travelled by pilot after ejection, d = 370 mcrater depth, x = 1.1 mmass of the pilot,…

Q: Give an example when the work done by a force is 1. Positive 2. Negative 3. Zero What is the effect…

A: Expression for the work done by a force is W=Fdcosθ The work done is positive when the displacement…

Q: A weight lifter lifts a 380 N set of weights from ground level to a position over his head, a…

A: Given data: The amount of weight lifted is L=380 N. The height of weight lift is h=2.10 m.   The…

Q: If a work of 0.4 joule is needed to stretch a spring a distance x=0.05m What is the force constant…

A: The work required to stretch a spring to a distance is given.

Q: Discuss whether any work is being done by each of the followingagents and, if so, whether the work…

A: The definition for work is,

Q: 4.0 J of work is reflected by stretching a spring with a spring constant of 2500N / m. How much does…

A:

Q: Procopio is driving a car (m = 1000 kg) at vj = 11.11 m/s when he stepped on the brakes. The car…

A: Given: The mass of the car is 1000 kg. The velocity is 11.11 m/s. The distance covered is 15 m.

Q: At Schlitterbahn, a 75.0 kg person rides a 12.0 m high water slide. If dissipative forces do -6.25 x…

A: Given m=75kg h=12m Ed=-6.25*10^3J To find the velocity at the bottom of the slide :

Q: A skier of mass 77 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to…

A: Distance for which he was pulled,d= 55m Angle of slope with horizontal= 30°

Q: In the figure shown, if the mass (m=6 Kg) is moving with constant speed and traveled a distance…

A:

Q: Find the work done by a 45 N force in pulling the luggage carrier at an angle e = 50 for a distance…

A: Option A is the right answer  2170 J

Q: 2m Using this force, calculate how much work Slim Jim does to lift the object. Force of weight =mg…

A:

Q: The coefficient of kinetic friction between a suitcase and thefloor is 0.272. If the suitcase has a…

A:

Q: A student slides her 67 kg desk across the level floor of her dormitory room a distance 8 m at…

A:

Q: In the figure, a constant force Fa of magnitude 86.0 N is applied to a 4.0 kg shoe box at angle o =…

A:

Q: For saving energy, bicycling and walking are far more efficient means of transportation than is…

A: Egas = 1.3 x 108 J/gal 1 kcal = 4186 J Vb = 11 mi/h Eb = 400 kcal = 400 x 4186 = 1.67 x 106 J Vw = 3…

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

A: Step 1Let m be the mass of the humming bird, l be the length of one stroke and t be the time taken…

Q: A floating ice block is pushed through a displacement d→=(16.0m)î-(17.0m)ĵ along a straight…

A: Work done

Q: A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or…

A: Work is done whenever the given two conditions are satisfied: a force acts on the body. there is a…

Q: A linear spring has a free length of 47m.When it is under a hanging load of 1302N,it's total length…

A: A) original length = 47 cm final length = 82.5 cm change in length = 82.5 - 47  = 35.5 cm Using…

Q: Which, if any, of the following statements concerning the work done by a conservative force is NOT…

A: To identify : the statement which is not true for work done by a conservative force

Q: Find the work done in joules by gravity as an object of the mass m 5 kg is raised up at constant…

A: Mass of object m = 5 kg Initial height h1 = 26 m Final height h2 = 69 m g = 10 m/s²

Q: one series of aircraft exercises, a pilot went down 370 m after ejecting from his jet plane and…

A:

Q: A 20.0-kg child descends a slide 1.90 m high and reaches the bottom with a speed of 1.35 m/s . a)…

A: As we know, Kinetic energy (KE) = 1/2 mv2  --------(1) where m is the mass of a child and v is…