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 this, about how much power is she supplying?A. 100 W         B. 200 W       C. 300 W         D. 400 W

Q: hen released, a 100-g block slides down the path shown below, reaching the bottom with a speed of…

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Q: How much work do the breaks on a 3200 kg car need to do in order to slow it from 30 m/s to 20 m/s?

A: Given mass m=3200Kg V1=30m/s V2 = 20m/s According to work energy theorem work done by the car is…

Q: A worker pushes a sled with a force of 50 N over a level distance of 10.0 m. If a frictional force…

A: Concept of Net work done on an object moving on frictional surface: A frictional surface causes an…

Q: A weighlifter lifts a 50-kg barbell a vertical height of 2.0 m in 5.0 s. What is the average power…

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Q: Which statement about work is NOT true? OA. Work cannot be negative. B. Work is a scalar. OC. The…

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Q: How much work is needed to change the speed of a 2375 kg sport utility vehicle from 15.0 m/s to 60…

A: Given data:  Mass (m) = 2375 kg Initial velocity (Vi ) = 15.0 m/s Final velocity (Vf) = 60 m/s…

Q: 4. An 80-lb girl climbs a 12-ft rope in 7.5 s. Her average power output is a. 0.13 hp b. 0.19 hp c.…

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Q: 1. a) Calculate the work done when a truck pulls on a load at a 35° angle with a force of 4000 N and…

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Q: The average horsepower required to raise a 150 kg drum to a height of 20 m in a time of 1 minute is…

A: Givenmass, m=150 kgheight, h=20 mtime , t=1 min            =60 swork done would beW=mgh…

Q: A 1500-kg automobile moves at a constant speed of 60 MPH across a 10-m inclined surface. What is the…

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Q: 1) A freight plane has a total mass of 4.00 x 105 kg (including cargo). It starts from rest at sea…

A: Given, Mass of freight plane (M) = 4×105kg  Initial speed (u)= 0 m/s  Initial height(hi) = 0 m (…

Q: A child lifts a 5 kg box up from the floor. The child then carries the box with constant speed of 1…

A: Given : m = 5 kg v = 1 m/s

Q: A cheetah can accelerate from rest to 7.4 m/s (about 17 m/h) in 1.1 seconds. How much average power…

A: The correct choice of answer is option (a) i.e. 1300 W

Q: Starting from rest, a 5.00-kg block slides 2.50 m down a rough 30.0º incline. The coefficient of…

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Q: A 6.0-kg block is released from rest 80 m above the ground. When it has fallen 60 m its kinetic…

A: Given data:  Mass (m) = 6.0 kg Height fallen (Δh) = 60 m Required: The kinetic energy of the block

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

A: Given, Mass=30kg Distance=6m Time=4sec

Q: 8. DETAILS SERPSE10 8.5.OP.017. MY NOTES ASK YOUR TEACHER A 650-N Marine in basic training climbs a…

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Q: Q13. A crane lifts a block of mass 1000 kg through a vertical height of 15 m in 25 s. Calculate the…

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Q: At time t = 0 a 2-kg particle has a velocity in m/s of (4 m/s) i - (3 m/s) j. At t = 3 s its…

A: Step 1It is given that

Q: Question 18) A box is lifted vertically 1.5 m and is then held there. The box has a weight of 100 N.…

A: solution Work is done in holding the box in this position B:w=?

Q: 12. A person runs up a long flight of stairs in 10 seconds. If the person’s weight is 600 N and the…

A: Given data The time taken by the person is t = 10 s. The person weight is W = 600 N. The vertical…

Q: How much power is expended if you lift a 50 N rock 10 m in 2 seconds? A.250 W B.25 W C.2.5 W D.5 W

A: Given data:  Weight (mg) = 50 N Height (h) = 10 m Time (t) = 2 s Required: Power (P)

Q: A 70.0 kg skier , starting with a speed of 1.00 m/s skies down a rough 17.0 m high ski hill and then…

A: Mass of skier (m) = 70 kg Initial speed (vo) = 1 msHeight of hill (H) = 17 m velocity at the bottom…

Q: A shopper pushes a cart 20.0 m at a constant speed across a level floor in a grocery store, against…

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