(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 47 kg CG Freaction 0.85 m 1.42 m N (b) How much work (in J) does she do if her center of mass rises 0.220 m? (c) What is her useful power output (in W) if she does 24 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) w

Q: A 140-lb man carries a 5-lb can of paint up a helical staircase that encircles a silo with radius 20…

A: Total weight is , w=140+5=145 lb  Radius ,R=20 ft  Height or displacement, d=80 ft  We have to find…

Q: The compound bow in the previous problem requires 152 J of work to draw the string back tox = 0.540…

A:

Q: In order for an object to roll smoothly (with constant angular acceleration) down a ramp, it must…

A: Solution: a) An object of radius R rolls without slipping in the inclined ramp of the height h. From…

Q: Work and Torque have the same physical dimensions True False

A: To determine  True and false

Q: (a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant…

A: M=68kg

Q: Suppose you use an ideal pulley of the type shown in the figure below and find it necessary to exert…

A:

Q: Can you please solve this problem and show all of the steps

A: Hey, since there are multiple subparts question posted, we will answer first three questions. If you…

Q: A gardener pushes a 12 kg lawnmower whose handle is tilted up 37∘ above horizontal. The lawnmower's…

A: Mass of object is Angle is Coefficient of rolling friction is Speed is Note:Find:Power.

Q: A solid cone with height 9 m and base with radius 2.7 m is built using a lightweight material whose…

A:

Q: A 1.80 kg ball is held at rest up one side of a half-pipe.  It is 1.90 m off the ground when it is…

A:

Q: A person opens a door by applying a 13-N force perpendicular to it at a distance 0.90 m from the…

A:

Q: (a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant…

A: Given data: Mass of the person (m) = 68 kg.Distance 1 (d1) = 0.85 m.Distance 2 (d2) = 1.42 m. To…

Q: Find the scalar and cross product of two vectors using component method.

A: The scalar product is given by  A→ . B→ = A B cosθA→ . B→ = 6×4×cos30° = 20.785

Q: What is her useful power output (in W) if she does 30 push-ups in 1 min? (Should work done lowering…

A:

Q: The puck in the figure below has a mass of 0.120 kg. The distance of the puck from the center of…

A:

Q: Using the definition of the scalar product, find the angle between the following vectors.

A:

Q: A point mass of 1.2 kg at the end of a cord is rotated on a frictionless horizontal surface in a…

A: Given that: r= 0.2 m w= 3.8 rad/s m= 1.2 kg We know that I= mr2 where I is the moment of inertia…

Q: (a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant…

A: Mass of girl: mg = 47 kg Distance between feet and force of reaction (F): df = 1.46 m Distance…

Q: What energy transformations are involved when a dragster engine is revved, its clutch let out…

A: According to the law of conservation of energy,Energy can neither be created nor be destroyed but…

Q: A device for exercising the upper leg muscle is shown in the Figure, together with a schematic…

A:

Q: The angle between two unit vectors is 1.1 radians. What is the dot product of these two unit…

A: Given data:  Two unit vectors Angle (θ) = 1.1 rad Required: The dot product of the these unit…

Q: A rod of length Lis held upright and pivoted on the floor and then dropped. Find the speed of the…

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: A disk with uniform density and radius 0.467 m used to weigh 33.74 kg, but then a hole was punched…

A:

Q: A horizontal 790-N merry-go-round of radius 1.40 m is started from rest by a constant horizontal…

A: Mass of merry -go round (m) = Weight/ 9.81 m = 90/9.81 m = 80.53 Kg   The shape of merry – go round…

Q: ladder is raised to a vertical position Compute the work done by the force lifting the ladder. The…

A: Weight of ladder,                     Length of ladder,                     The ladder is raised to…

Q: A ladder, 10 meters long, is lying on the ground with a total mass of 80 kg. How much work is…

A:

Q: (a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant…

A:

Q: 8. A person spins a grindstone with a radius of 0.16 m along its edge, making the grindstone spin…

A: (8) The given data are: r=0.16 mW=402 J Here, r denotes the radius and W denotes the workdone.