physics student with a mass m of 50.0 kg is doing push-ups, as shown in the figure below. In addition to her weight, she is supported by the force at her toes and her hands. With each push-up her center of mass rises by 25 cm. You can treat her as a particle of mass m. What is her useful power output if she does 18 push-ups in one minute? Assume she does only work when pushing up, not when lowering herself again

Q: 1. What is the total mechanical energy (TME) of a 1000kg motorcycle resting on the top of a 10m…

A:

Q: A cart is loaded with a rock and pulled at constant speed along an inclined plane to the height of a…

A:

Q: A 67.0−kg short-track ice skater is racing at a speed of 12.4 m/s when he falls down and slides…

A: Given Mass of the ice skater is m=67.0 kg Initial speed of the ice skater is v0=12.4 m/s Final…

Q: A 64 kg human sprinter can accelerate from rest to 10 m/sm/s in 3.2 s . During the same time…

A: P=∆E∆t=0.5mv2f-v2i∆t

Q: An accelerating object of mass m=2 kg is fired with an initial speed v=8 m/s at a starting point. If…

A: Given data: Mass m =2 kg Velocity v=8 m/s2. Final Kinetic energy =268 J

Q: The dot product is an operation between two vectors and is a fundamental part of the definition of…

A: The vectors are given as,

Q: a = 1.2 ms? A Smart Car accelerates from rest as shown. 12. If the constant acceleration occurs over…

A: m=Mass of smart car=860 kga=Acceleraiton of car=1.2 m/s2s=Displacement of car=30 m

Q: In scaling a vertical wall, spiderman needs 3.1 kW of power to maintain a speed of 4.5 m/s. If…

A:

Q: A golfer hit a 40.80 gram golf ball from the fairway giving it an initial velocity of 35.4 m/s.  It…

A:

Q: A 2.0-kg potato has been launched out of a potato cannon at 9.0 m/s. What is the kinetic energy? If…

A: mass, m = 2 kg, velocity, v = 9 m/s , height, h = 4 m

Q: A toad with mass of 188 g leaps into the air to catch a fly. If the toad's jump was at an angle of…

A: Given: Toad's mass, m=188 g=0.188 kg Toad's jumping angle w.r.t horizontal, θ=35° Initial velocity,…

Q: if an 80 kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3 s, what average…

A:

Q: What average power is needed to lift a 65-kg vendor vertically upward at a uniform speed of 0.44…

A:

Q: Using 1000. J of work, a small object is lifted from the ground floor to the third floor of a tall…

A:

Q: A soccer player strikes a 428 gram ball with an initial velocity of 27.4 m/s. The ball strikes the…

A:

Q: Matthew pushes a box of toys along a 5 m long ramp that is inclined 3 m high as shown in the figure…

A:

Q: A sledgehammer of mass m = 1.2 kg falls freely vertically downward from a height of h = 2.1 m at an…

A: mass of sledgehammer (m) = 1.2 kg Height (h) = 2.1 m initial speed (v) = 8.5 msd = 0.055 m

Q: A 5.0-kg cart is moving horizontally at 4.0 m/s. In order to change its speed to 6.0 m/s, the net…

A: Given: Mass of cart m=5.0 kg Initial speed u=4.0 m/s Final speed v=6.0 m/s To find net work done in…

Q: A particle of mass m= 4kg is released from point A and slides on the frictionless track shown in…

A: The work done by gravity is the change in the gravitational potential energy. gravitational…

Q: A top fuel dragster with a mass of 600.0 kg starts from rest and completes a quarter mile (402 m)…

A: Given: mass of top fuel dragster, m = 600 kg Initial speed, u = 0 (starting from the rest) Final…

Q: If gravity is pulling a 0.15 kg ball down 2.0 meters, what is the magnitude of the force doing work…

A:

Q: 11. A ball weighing 20 N is dropped from rest from a height of 8 meters above the ground. Assuming…

A: Total mechanical energy is the sum of kinetic energy and potential energy.

Q: A stone with a mass of 2.40 kg is moving with velocity (5.20î – 1.80ĵ) m/s. (HINT: v2 : () What is…

A:

Q: Using the work and energy relations, solve for the constant force "P" required for a system…

A: The work energy theorem states that the work done by the system of forces is equal to the change in…

Q: A bird of mass m = 2kg flies at a height h = 10 m from the ground with a constant horizontal speed v…

A: The mass of the bird, m=2 kg   The height, h=10 m   The horizontal speed, v=10 m/s

Q: A 50-N force is the only force on a 2-kg crate that starts from rest. Consider the instant the…

A: Velocity is due to at constant acceleration a=ForceMass

Q: A horizontal force of 5 N is required to maintain a velocity of 2 m/s for a block of 10 kg mass…

A: Given data : Force=F Mass=m time=t Velocity=V   TO FIND : Work done

Q: A 500 kg horse can provide a steady output power of 750 W (that is, 1 horsepower) when pulling a…

A: Write the formula for power in terms of force. Therefore, the power output of the dog be:

Q: In order to test energy principles, I decide to do the following experiment with my son at the…

A:

Q: An object of mass 4.34 kg starts at the top of a hill of height 2 m. When it rolls down to the…

A: The solution is given below

Q: For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at…

A: In this question we are given that an athlete lifts a barbell that weighs 400 N from the ground to a…

Q: A 2.80-kg object has a velocity (6.20 î - 2.40 ĵ) m/s. (Note: From the definition of the dot…

A:

Q: A force of 200 N displaces a body by 4 m, calculate the work done (in J). A) 40 B) 500 C) 80 D) 800

A: Given Data: The force applied is, F = 200 N. The displacement happened is, s = 4 m. The work is…

Q: A object 2 kg is moving in one dimension with a velocity given by  V(t)= 1 / 2 t^2  at t=4 s.…

A:

Q: A bag of wheat weighs 200 kg. To what height should it be raised so that potential energy is 9800 J?…

A: Given data:  Mass (m) = 200 kg Potential energy (U) = 9800 J Acceleration due to gravity (g) = 9.8…

Q: A 48.5 woman starts from rest at the bottom of a flight of stairs that has a total height of 2.56…

A:

Q: What is the average power must produce to accelerate car with 1500 kg from rest to the speed 30…

A:

Q: The spring-flex exercise system consists of a spring with one end fixed and a handle on the other…

A:

Q: Little Hudson holds the 10-kgkg barbell 0.3 mm above the floor. What is the PE of the barbell…

A:

Q: Consider the figure below: Fapp = 120 N m = 30.0 kg f = 5.00 N d = 0.800 m w N Calculate the total…

A: Given data The force applied is given as Fapp = 120 N. The frictional force is given as f = 5 N.…

Q: How much power is required to raise a 30-kg crate a vertical distance of 6m in a time of 4 seconds?…

A: The potential energy of a body is given by PE = mgh, where m = the mass of the body g = acceleration…

Q: Consider the potential energy graph shown This graph is for a 2 kg object. At t=0 you are located at…

A: The total mechanical energy at point D for t=0, and be calculated as,

Q: The graph in the figure below shows the magnitude of the force ex- erted by a given spring as a…

A: We need to calculate the work done in stretching the spring by the given amounts in parts a and b.

Q: A woman uses a pulley and a rope to raise a 20 kg weight to a height of 2 m. If it takes 4 s to do…

A: mass, m = 20 kg  height, h = 2 m  time, t = 4s  The formula for energy is  E = m g h  The power is…

Q: What is the average power output of a 55.0 kg woman who does 50 deep knee bends in which her center…

A: The expression for the output power is,

Q: A snowboarder and her board (combined mass 40.0 kgkg) are moving at 9.30 m/sm/s at the bottom of a…

A: Solution: Given that total mass m = 40 kg speed v = 9.3 m/s height achieved due to friction h' = 3.5…