Which of these is an example of no work being done?   a. a child pushes a toy car across a flat table   b. a ball is dropped from a height of 1.00 m to the floor   c. a car has the force of its brakes applied to the left while moving to the right   d. a weightlifter holds 500 pounds above his head and does not move   e. all of these

Q: you push a 90 kg box across a 12 m room. it takes you 30 seconds at a steady speed. your push force…

A: The work done by the man to push the box is as follows: W=F→·d→W=Fdcosθ             θ=0°W=Fd…

Q: You throw a 3.00 N rock vertically into the air from ground level. You observe that when it is 14.0…

A:

Q: You throw an 18.0 N rock into the air from ground level and observe that, when it is 11.0 m high, it…

A: Given  weight of the rock=mg=18 N m=18/9.8=1.84 kg speed at height (h=11 m) is 18 m/s

Q: QUESTION 3 What happens when a net force performs positive work on an object? O a. The object…

A: Work-energy theorem gives us a relation in b/w work & K.E. This theorem states that when at…

Q: A spring has a natural length of 18 cm. If a 25-N force is required to keep it stretched to a length…

A:

Q: 5. Nurses Camille and Simon alternately push a patient in a wheelchair with a total mass of 10okg.…

A: 1. 2902.5 Joules  2. 4490 Joules

Q: A cart (m=14 kg) slides along a level track with a velocity of 5 m/s. It then collides and sticks to…

A:

Q: A man returning from ice fishing trip pulls a sled with fish. Total mass of the sled and fish is…

A:

Q: An Alaskan dog sled racer pulls his 75.0 kg sled at an angle of 40.0 degrees to the ground. He…

A:

Q: 1. If you pushed a 20 kg box across the floor for a distance of 60 m with a force of 15 N how much…

A: #1 Given data: The mass of box is m=20 kg. The distance traveled by the box is d=60 m. The force…

Q: A worker pushing a 35.0kg wooden crate at a constant speed for 12.0m along a wood floor does 350J of…

A: (a) Force applied by the worker using the expression for work done W=FdF=Wd=350 J12.0 m=29.166…

Q: There is a 100 kg box that starts at rest. a person pushes that box over the course of 18 meters…

A: Given mass of box m = 100 kg initial speed u = 0 m/s final speed v = 10 m/s displacement x = 18 m…

Q: A child sets a 2.5 kg block in motion by giving it a push along a floor. This gives the block a…

A: Given: The mass of the block is m=2.5 kg The initial velocity of the block is u=0 m/s The final…

Q: 4. Two men, Joel and Jerry, push against a car that has stalled, trying unsuccessfully to get it…

A: The work done on the car is given as, Here, F, d and θ represent the force, the displacement and…

Q: I Review I Constants An 8.5 kg crate is pulled 5.4 m up a 30° incline by a rope angled 19° above the…

A:

Q: In pulling two identical carry-on bags through the airport, Mr. Beall and his 7 year o son, James,…

A: James uses a greater force because he is shorter, making a smaller angle with the ground

Q: A worker pushing a 35.0-kg wooden crate at a constant speed for 12.0 m along a wood floor does 350 J…

A: The expression for the applied force,

Q: Several children are on a sled pulled by a four-wheeler across a level snow-covered field. The sled…

A: Given:-  The speed of the sled is v = 9.35 m/s is constant  The tow rope [ parallel to the ground ]…

Q: You throw a 20-N rock vertically into the air from ground level. You observe that when it is 15.0 m…

A: Given Data Weight of the rock is W=20 N Height of the rock from the ground is h=15.0 m Speed of the…

Q: A child lifts a box up from the floor. The child then carries the box with constant speed to the…

A: Given:  A box is pushed with a constant speed.

Q: You throw a 24.0 NN rock into the air from ground level and observe that, when it is 14.0 mm high,…

A: weight = 24 N mg = 24m = 24/9.8 m = 2.45 kg H = 14 m V = 16 m/sA)Using work energy theorem…

Q: Q2: A spring of natural length 10 inches stretches 1.5 inches under a weight of 8 pounds. Find the…

A: Convert the length from in to m. The natural length of the spring. The stretched length of the…

Q: 76. A cable lifts a 1200-kg elevator at a constant velocity for a distance of 35 m. What is the work…

A: To determine: (a) The work done by the tension in the cable. (b) The work done by the elevator’s…

Q: the first four parts please

A: The mass of the piano (m)Distance (d)The angle of incline

Q: a-) Determine the work a hiker must do on a 15.0-Kg backpack to carry it up a hill of height…

A: a)Work done by hiker  w=mgh=15*9.81*10=1471.5J b)Work done by gravity  W=-mgh=-15*9.81*10=1471.5J

Q: A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 30.0-m tall building.…

A:

Q: 90 N F Example 4.1 30° 30 kg A person pulls a 30 kg crate 10 m across a level floor using a rope…

A: Use work done general formula i.e It is given by the dot product of force and dis

Q: A motorcyclist runs out of gas on a level road 250 m from the gas station. She pushes the 220-kg…

A: distance of the gas station (d) = 250 m mass of motorcycle (m) = 220 kg  Applied constant force (F)…

Q: An Athlete pulls a 20 kilograms crate along Lane A of the storage house. Lane A is a 15m  aisle.…

A:

Q: A crate slides down a ramp that makes a 20° angle with the ground. To keep the crate moving at a…

A: Work done is the amount of energy required to move an object. Variables known, Force on the block is…

Q: A force of 50 N is required to stretch a spring 10 cm beyond its natural length. How much work will…

A: Given, Force=50N Spring length=10cm=10×10^-2=0.1m

Q: A worker pushing a 35.0-kg wooden crate at a constant speed for 13.6 m along a wood floor does 400 J…

A: Work done by moving a body by a distance (s) is given by W = F.s, where F is the force applied. If a…

Q: A 950 N skydiver jumps from an altitude of 3000 m. What is the total work performed on the skydiver?…

A: SOlution:

Q: Q4] a-How much work is done by the horizontal force F1-150N on the 20 Kg block when the force pushes…

A: BY Work energy theorem, External work= change in P.E                                       +…

Q: 12. Which of the following statements represent example of situation showing work? Select one: a. A…

A: Given,  Out of the given situations, which is showing work.  A) child applies force and become tired…

Q: You push a 4 kg box from rest to a speed of 7 m/s.  As you push it the box travels 30 m forward.…

A: Note : Since question has multiple sub-parts and as per guidelines we can provide solutions to first…

Q: A woman jumps from a high wall and lands in soft sand. The sand exerts an average upward force of…

A: Newton's third law of motion states that every force has an equal and opposite reaction to the body.…

Q: 3. A 60 kg boy does 60 push-ups in 40 s. With each push-up he must lift an average of 70 % of his…

A: Given, Mass=60kg Time=40s

Q: In the arrangement of the first figure, we gradually pull the block from x = 0 to x=+3.0 cm, where…

A: Given that: On the W axis, 10 small boxes has a total value of Ws=1.0 J Value of each small box in…

Q: 14, The driver of a 1900 kg car (including passengers) traveling at 24.0 m/s slams on the brakes,…

A:

Q: Wendy (mass = 45.0 kg) climbs a rough incline (coefficient of friction = 0.26) that is 2.75 m long…

A: Draw the free-body diagram of Wendy.

Q: An Athlete pulls a 30 kilograms crate along Lane A of the storage house. Lane A is a 15m  aisle.…

A:

Q: If we know that a force of 5 N acts on an object while it moves 2 meters, can we calculate how much…

A: Force exerted on an object = 5 N Distance moved by object = 2 m

Q: Rene pushes a 25.8-kg box at a constant velocity for a distance of 35.9 m on a flat horizontal…

A: The box moves with a constant velocity, so net force on it would be zero

Q: Q15. Which of the following is not an example of potential energy? A moving car Water stored in the…

A: Potential energy always comes into picture due the object's position with respect to the other…