7. A 210-kg roller coaster reaches the top of the steepest hill with a speed of 5.20 km/h. It then descends the hill, which is at an angle of 40° and is 45.0 m long. What will its kinetic energy be when it reaches the bottom? Assume µk = 0.16.

Q: A 1.00 m long rod weighing 300 g hangs from the ceiling. For how much does its potential energy…

A:

Q: 15. What is the resistive force on a cyclist who has leg muscles of power 200 W each and who reaches…

A:

Q: Starting a race, a 68.2-kg sprinter runs the first 7.04 m in 1.60 s, starting from rest and…

A: Given: The mass (m) of the sprinter is 68.2 Kg. The distance (S) covered by the sprinter is 7.04 m.…

Q: A motor car of mass 800 kg is dlimbing up an incline of 8= 10 to the horizontal. 50 m FIG. 5 1)…

A:

Q: 4. In a time t=18.00 s, a 60.0-kg student runs at a steady pace up two flights of stairs whose…

A: Given data:  Time (t) = 18.00 s Mass (m) = 60.0 kg Vertical height (h) = 7.80 m Required: Power…

Q: A bag of wheat weight 300 kg .To what height should it be raised so that potential energy is 9600 J?…

A: Given data :        Mass of the bag  =  m         Potential energy   =  P•E         Acceleration due…

Q: What average power is needed to accelerate a 1 kg soccer ball from rest to 36 km/hr in 0.1 seconds?…

A: Given data: Mass (m) = 1 kg Initial velocity (v0) = 0 m/s Final velocity (v) = 36 km/hr Time (t) =…

Q: A girl weighing 470 N hangs suspended on the end of a rope 8 m long. What will be her gain in…

A:

Q: 4. A box of mass m= 2.0 kg initially at the bottom of a ramp is given a brief hard shove up the ramp…

A: If there was no energy loss then the bag would come back with the same kinetic energy i.e. with the…

Q: A car of mass 1200 kg travels along a horizontal road at a speed of 10 ms'. At the time it begins to…

A: GIVEN THAT    m =  1200 kg      speed = 10 m/s      acceleration = 0.2 m/s2    resistive force = 160…

Q: A 20.0 kg crate, initially at rest, slides down a ramp 2.0 m long and inclined at an angle of 20°…

A: solution as

Q: A 450 kg dragster accelerates from rest to a final speed of 120 m/s in 400 m (about a quarter of a…

A: mass of dragster = 450 kg Initial velocity = 0 m/s final velocity = 120 m/s distance moved = 400 m…

Q: A cheetah can accelerate from rest to 6.4 m/s (about 16 m/h) in 1.2 seconds. How much average power…

A:

Q: 8.19. What is the kinetic energy of a 2400-lb automobile when its speed is 55 mi/h? What is the…

A:

Q: Mr. DelliGatti decides to break the Guinness Book of World Records for bungee jumping. He goes to…

A: Potential energy is defined as U=mgh Here m is mass, h is height and g is gravitational acceleration…

Q: A 72.0 kg swimmer jumps into the old swimming hole from a tree limb that is 3.45 m above the water.…

A:

Q: A 240-kg roller coaster reaches the top of the steepest hill with a speed of 5.60 km/h. It then…

A:

Q: A 135g Frisbee is thrown from a point 1.05 m above the ground with a speed of 12.00 m/s. When it has…

A: Given m=135g H1=1.05m H2=2.50m V1=12.00m/s V2=10.4831m/s   Work done on the Frisbee can be defined…

Q: A roller coaster cart of mass m = 241 kg starts stationary at point A, where h1 = 39.4 m and a while…

A: The potential energy of the car at A relative to the ground is given by, UA=mgh1

Q: A car of wheat weight 330 kg . To what height should it be raised so that potential energy is 8860 J…

A: Given value--- mass = 330 kg. potential energy = 8860 J. g = 9.8 m/s2.  We have to find---…

Q: A 34.7 kg child rides a 5.30 kg toboggan down a 13.1 m high snowy hill. If the child starts from…

A: Given,

Q: In order to get the cart from Point (1) to Point (2), a 3000.0 W motor was used to pull the 25.0 kg…

A: Solution: given that m = 25 kg motor  power = 3000 W

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

A: Given: The weight is 400 N. The height lifted by athelet is 2.2 m. The time interval is 1.6 s.

Q: Water flows over a section of Niagara Falls at a rate of 1.4 × 106 kg/s and falls 60 m. What is the…

A: Given: The rate of mass of the water=dmdt=1.4×106 kg/s. The height of the fall=h=60 m Acceleration…

Q: Without pedaling, the rider rides down a 3.0% slope with constant speed of 7.0 m/s. With how much…

A: Slope = 3% therefore, θ = Tan-1(0.03) = 1.718oV = 7 msmass (m) = 80 kg

Q: 17.25) Compute the power required to overcome drag on a  truck with a drag coefficient of 0.75 when…

A: Given DataCd=0.75V=65kmph=18.056m/sT=40°Cw=8fth=12ftA=8×12=96ft2

Q: An advertisement claims that a 1000 kg car can accelerate from rest to a speed of 20 m/s in a time…

A: mass = 1000kg v1= 0m/s;    v2=20m/s t= 5sec. K.E1= 0  (car starts from rest) K.E2= (1/2)* 1000*…

Q: how much power in watts is required to accelerate a 1200 kg car from rest to 16 m/s in 8 seconds…

A: Solution: Given: m = mass of car = 1200 kg u = initial speed of car = 0 m/s v = final speed of car =…

Q: A 2kg steel sphere is dropped from a height ʼn and, when it hits the ground, its kinetic energy is…

A:

Q: 47. A 1500 kg car accelerates from rest to 75 km/h in 45s. How much power is supplied by the engine…

A: Given data: Mass of the car, m=1500 kg Since car starts from rest, we can take initial velocity,…

Q: A belicopter with mass m 3250 kg is cruising at a speed of 56.9 m/s at an altitude of 185 m. What is…

A:

Q: A bag of wheat weight 100 kg .To what height should it be raised so that potential energy is 2500J?…

A: Given data :     Mass of the bag  =  m     Acceleration due to gravity  =  g    Potential energy  =…

Q: A bag of wheat weight 320 kg. To what height should it be raised so that potential energy is 8220 J?…

A: Given:  Mass (m) = 320 kg Potential Energy (U) = 8220 J Acceleration due to gravity (g) = 9.8 m/s2…

Q: A 98 kg bicyclist traveling 15 m/s coasts up a 5 m high incline. After reaching the top of the…

A: Given: Mass of bicyclist, m=98 kg Speed of bicyclist at bottom, u=15 m/s Speed of bicyclist at top…

Q: 11. What happens to the kinetic energy of a moving object if the net work done is positive? c. The…

A: Since you have posted a question with a multiple sub parts, we will solve first three sub - parts…

Q: A car accelerates uniformly from rest to 24.2 m/s in 8.46 s along a level stretch of road. Ignoring…

A: The initial velocity of car = 0 m/s.The final velocity = 24.2 m/s.The time taken  by the car to…

Q: 3. A 0.20-kg particle moves along the x axis under the influence of a stationary object. The…

A: Given data: ·         The mass of the particle is m=0.20 kg. ·         The potential energy of the…

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: A 55.0 g tennis ball was hit by a racket at an angle of 34.9° above the horizontal and travel a…

A:

Q: A car accelerates uniformly from rest to 20.0 m/s in 5.6 s along a level stretch of road. Ignoring…

A: Given that, The initial speed of the car, u = 0 Final speed of the car, v = 20 m/s Time, t = 5.6 s…

Q: What average mechanical power (W) must a 76.5kg mountain climber generate to climb to the summit of…

A: Given that: m=76.5 kgg=9.8 m/s2h=405 mt=46 min=2760 sec W=?

Q: What is the kinetic energy of a m = 12kg package dropped from the top of the mountain, which is H =…

A:

Q: What average mechanical power (in W) must a 61.5 kg mountain climber generate to climb to the summit…

A: According to work energy theorem, the work required to climb the hill is,Substitute the values,