11. A champion athlete can produce one horsepower (746 W) for a short period of time. The number of 16 cm high steps a 70 kg athlet could ascend in one minute while expending one horsepower is 4. a. b. 7. с. 65. d. 408. е. 4 567.
Q: The work performed as a function of time for a certain process is given by: W = at³, where a = 2…
A:
Q: 2E. How much work (in ft-lbf, Btu, and kJ) is required to accelerate a 3400 pound car from rest to a…
A:
Q: An 69 kg Man runs upstairs and reaches 9m height for 13 s. What is his power? Use g=9.8m/s2
A: Power is defined as energy consumed per unit time, P=Et (I)…
Q: Ans. (i) 2000 J (ii) 1000 J 18. A truck weighing 1000 kgf changes its speed from 36 km h-¹ to 72 km…
A: Given data, Mass of the truck m = 1000 kg Initial velocity u=36 km/h=36×518=10 m/s Final velocity,…
Q: A 95 kg man runs up a 20 m high stairs at a constant speed. If it takes him 8 seconds to reach the…
A: The rate of doing work is called power.
Q: A new record for running the stairs of the Empire State Building was set on February 3, 2003. The 86…
A:
Q: A 1200-kg car accelerates from 30 to 50 km/h in 5 s. How much work input does that require? answer…
A: Given value--- mass = 1200 kg. initial speed = 30 km/h. final speed = 50 km/h. Time = 5 sec. We…
Q: A 2.0-kg rock falls from a height of 25 m to a point 20 m above the ground. (a) How much potential…
A: Given: The mass of the object is 2 kg. The itnial height of the object is 25 m from the ground. The…
Q: 2. A certain 1500.0 kg fancy sports car can accelerate from rest to 30.0 m/s over a distance of 40.0…
A: Given, Mass of car (m) = 1500 kg Initial speed of car(u) = 0 m/s Final speed of car (v)= 30m/s…
Q: O. 14 : Work done in blowing a soap bubble of diameter 2 cm, is (S.T. = 3 x 10-² N/m) (a) 7.54 x 10…
A: To find-Work done (W)=?Given-Diameter of soap bubble D=2 cmRadius =D2=22=1 cmRadius(r)=1×10-2…
Q: SI unit of power is the Watt (W).
A: This question is based on Unit dimensions .
Q: Question 9. The cheetah is one of the fastest accelerating animals, for it can go from rest to 9.4…
A:
Q: 30. John is riding an elevator. If John notes that the elevator travels upwards with a speed of 0.23…
A: mass (m)=75 kg acceleration due to gravity(g)=9.8 m/s2 speed(v)=0.23 m/s
Q: 7. At the instant she leaves the vault, Simone's velocity is 5 m/s and she is 2.0 m high. Simone's…
A: The expression for the total mechanical energy is,
Q: 3. An object has a mass of 7 kg. calculate it potential energy 6m above the ground. а. 411.6J b.…
A: Taking ground as reference level (a level at which potential energy is taken to be zero) the…
Q: How long will it take a 844-kg car with a useful power output of 48.5 hp (1 hp equals 746 W) to…
A:
Q: 4. A body moves a distance of 10 m under the action of a force that has a constant value of 5.5 N…
A:
Q: A (6.40x10^1) kg woman runs up a flight of stairs in 5 s. Her net upward displacement is 5 m. What…
A:
Q: What is the power output for a 60 kg woman who runs up a 3.00 m high flight of stairs in 3.50 s.…
A:
Q: A 430g book is dropped froma height of 1.9m. What is the kinetic energy of the book at the moment it…
A: Kinetic energy gained equals the change in potential energy. Ekinetic=Utotal-Uhalfway=mgh-mgh2=mgh2
Q: The energy stored in a spring is 20 J when it is stretched to 5cm. How much energy is stored when it…
A: Given data: Energy stored in spring (U) = 20 J Stretch in spring (x) = 5 cm New stretch in spring…
Q: Why is it tiring to push hard against a solid wall even if no work is done? A 75 kg firefighter…
A: Q 1) We get tired because we use our energy to contract the muscles. We try to push the wall using…
Q: Calculate the work done from x=0.0 to x = 7.0 m by the one-dimensional force depicted in the…
A: Note:- The area under the force-displacement graph gives the work done.Given- the graph of one…
Q: A car (m=1000 kg) is initially moving at a speed of 20 m/s (~45 mph) when the driver hits the brakes…
A: Work done is equal to change in kinetic energy W=∆EK=12mvf2-vi2=121000 kg0-20 ms2=-200000 J=-200 kJ
Q: An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height…
A: Given data :- Power P = 10 kW = 10 × 1000 W = 10000 W mass m = 200 kg height h = 40 m g = 10 ms-2
Q: The work necessary to stretch a spring from 9 in to 10 in is times the work necessary to stretch it…
A: The work done to stretch a spring from 9 to 10 in is 2/3 to 8 to 9 in.
Q: Wé are creating comething called
A: Given: Mass of cat m=5kg Power P=196 watt.
Q: 1. The shot is 1.2 m above the ground at 10 m/s when a shot-putter fires a 5 kg shot. It reaches 5 m…
A: Initial kinetic energy = (1/2)×mv2 Ki = (1/2)×5×102 = 250 J Initial potential energy = mgh Ui =…
Q: For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at…
A: Weight force of the barbell, FW=400 N Displacement, d=2.20 m It is assumed that the efficiency of…
Q: A 2.248 kg car accelerates from rest to a velocity of 17 m/s in 14 seconds. The power of the engine…
A:
Q: A car travelling at a speed of 60 km/h has a kinetic energy of 200 kJ. If the speed of the car is…
A: Given data The initial velocity of the car is given as u = 60 km/h. The initial kinetic energy of…
Q: A 75 kg sprinter accelerates from 0 to 8.0 m/s in 5.0 s. What is the metabolic energy, in kJ…
A: From work energy formula we know, Metabolic energy = change of K.E…
Q: 4. If the work required to stretch a spring 0.25?? beyond its natural length is 12 ?? − ??, how much…
A: We know that work required to be done to stretch a spring by x from it's natural length is given by…
Q: A boy with mass m-50 kg walks up h=2 m high stairs at a constant speed in t=4 s. What is the average…
A:
Q: What is your average power if you lift a 36.1 kg box at a constant speed to a height of 1.31 m in…
A: Calculate the work required for the to lift the mass. W = increase in potential energy of the mass…
Q: A rubber band has mass m = 0.30 g and a spring constant k = 15 N.m1.I stretch it by 5.0 cm (which in…
A:
Q: 4. A weightlifter raises a 150-kg barbell from the floor to a height of 2.2 m in 0.80 s. What is his…
A: Mass = 150 kg Height = 2.2 m Time = 0.80 sec
Q: 1.A particle of mass 6-kg moves under the influence of the force F(x)=(4√x)F(x)=(4x) N. If its speed…
A:
Q: 1. You raise a bucket of water from the bottom of a deep well. If your power output is 113 W, and…
A:
Trending now
This is a popular solution!
Step by step
Solved in 2 steps