A 2000 Kg car is moving at 54 km/hr behind a truck. In order to pass the track, the car changes its speed to 72km/hr in 5 sec. What engine power is developed during this time ? A. 15KW

Q: 1. A student of mass 40 kg caries a bag weighing 5000g from the ground floor to his class on the…

A: Work done by boy W= mgh Given that m= 5kg  h= 0.7m

Q: How much work must be done to stop a 1100-kg car traveling at 111km / h ? (Hint: You will need to…

A:

Q: A 169.5 lb hiker is able to ascend a 1,980.0 ft high slope in 1 hour and 45 minutes. (a) How much…

A: Given : F = 169.5 lb d = 1980 ft t = 1 hour 45 minutes = 6300 seconds

Q: 2. A car of mass 1200 kg initially moving at a speed of 10m/s suddenly changes its speed to 15m/s.…

A: a) The required work done is,

Q: A 63.0 kg cheetah accelerates from rest to its top speed of 31.5 m/s. HINT (a) How much net work (in…

A: (a) Using Work-Energy theorem, net work required is,

Q: Someone lifts 120g of snowballs off the ground, raises them to a height of 100 cm, and then throws…

A: m=120 g = 0.120 kg h=100 cm = 1 m  v=10 m/s g=10 m/s^2   Work done = energy

Q: Suppose a car travels 108 km at a speed of 35.0 m/s, and uses 2.10 gallons of gasoline. Only 30% of…

A: Solution :- Given values

Q: In a building, building materials are raised using an electric motor with a power consumption of…

A:

Q: bayomi drops a rock that has a mass of 5 kg om the top of a cliff. When it hits the bottom has a…

A: mass = m = 5 kg kinetic energy at bottom= Kb= 3.6 x 103 joules height of cliff = ?

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: 5. (a) What is the kinetic energy in joules of a 1000kg automobile traveling at 90km/h? (b) How much…

A:

Q: A 29 750 kg airplane travelling at 305 m/s. (a) How much is its kinetic energy( in J)? (answer as…

A:

Q: A wall, acted upon by a force of 20 N, does not move. The work done in this process is (A) 20 J (B)…

A: Since the wall is not moving anywhere displacement is zero.

Q: *The 3,000lb race car is up and running again and slides into a wall at 150mph. What is the kinetic…

A: A body is said to be possessing kinetic energy if it has a velocity. The higher the velocity of the…

Q: A truck travelling at a speed of 50 km/h has a kinetic energy of 600 kl. If the speed of the truck…

A:

Q: A car of 1100 kg mass changes the speed from 5 m/s to 6 m/s. What is the work done (in J) by the car…

A: Given, Mass of car m = 1100 Kg Initial speed of car u = 5 m/s Final speed of car v = 6 m/s

Q: An 190,000 W engine can accelerate from rest to a top speed in 9 s. How much work did the engine do?

A: We know that Work = (power)*(time)

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: Catching a wave, a 74.6-kg surfer starts with a speed of 1.18 m/s, drops through a height of 1.80 m,…

A: The initial energy of the surfer is

Q: A 5.0-kg rock falls off of a 10 m cliff. If air resistance exerts a force of 10 N, what is the…

A: mass, m = 5 kg  height, h = 10 m resistive force, f = 10 N  initial velocity, u = 0 m/s

Q: The motor is used in lifting a 200 kg object at a constant speed of 3 cm/s.  What power is being…

A: Given, Mass m = 200 kg  Velocity = 3 cm/s = 0.03 m/s  Power being developed by the motor ?

Q: A 74-kg boy is surfing and catches a wave which gives him an initial speed of 1.6 m/s. He then drops…

A:

Q: A 61.0 kg cheetah accelerates from rest to its top speed of 32.5 m/s. HINT (a) How much net work (in…

A:

Q: A horse pulls a cart with a force of 0.2 kN at an angle of 27 degrees with the horizontal and moves…

A: F = 0.2 kN = 0.2 x 103 N θ = 270 v = 10 kph = 10kmh×1000m1km×1h60min×1min60s = 2.778 m/s t = 12 min…

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: (I) How much work must be done to stop a 925-kg car traveling at 95 km/h?

A: Given :-      Mass of the car (m) = 925 kg       Initial velocity (v) = 95 km /h (or) 26.39 m/s

Q: Calculate the work done in lifting a 500-N barbell 2.2 m above the floor. (What is the gain of…

A: Given: Force, F = 500 N Height, d = 2.2 m

Q: A bicycle and rider going 13 m/s approach a hill. Their total mass is 75 kg. (a) What is their…

A: The initial velocity,

Q: A car of mass 500kg is moving at 10m/s. The engine does work on the car and the speed increases to…

A: SOlution: given that m = 500 kg v1 =10 m/s v2 = 16 m/s

Q: A 15,000 Watt crane is lifting a load with constant speed of 0.1 m/s. What is the mass of the load?…

A:

Q: your parents demand that you pick up the book and put it on a shelf that is a height of 1.8 m off…

A:

Q: 5. (a) What is the energy required to walk 20 km at 5 km/hr? (b) Assuming 5 kcal/g of food,…

A: Given:Distance, D=20 kmSpeed,v=5 km/hrA) Find Energy required.Now,It requires 4.6 calories per…

Q: A rocket sled having a mass of 1,504 kg reaches a speed of 349 " in 9 seconds. What average power…

A: Given data m=1504 kgV=349 m/sect=9 sec

Q: 6. Engines, including car engines, are rated in horsepower. What is horsepower? a. The force needed…

A: Horsepower is defined as power produced by the engine.

Q: A 2000 kg car can accelerate from rest to 50 m/s in 4.2 seconds. How much power does the engine…

A: The initial speed of a car is, u=0 m/s The final speed of a car is, v=50 m/s The car's mass is,…

Q: A 900 N crate slides 12 m down a ramp that makes an angle of 35° with the horizontal. If the crate…

A: mg=Weight of crate=900 Nθ=Angle of slope=35°Length of ramp=12 m

Q: 4. A horse performs 15,000 J of work pulling a wagon for 20 seconds. What is the horse's power A 750…

A: Power is defined as the ability of a body to do work and is given by, PowerP = Work doneWTime takent…

Q: A boy of mass 45 kg climbs a vertical rope 9 meters in length in 15 seconds with constant velocity.…

A:

Q: 1. A woman runs a kilometer using a force of 210N and a power output of 500W. How long in minutes…

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

Q: A lawn mower is able to use 365 J of chemical potential energy as the input to get 183 J of useful…

A: Given data:  Initial energy (Ein) = 365 J Output energy (Eout) = 183 J Required: Efficiency of the…

Q: machine does 2500 J of work in 1 min. What is the power developed by the machine?

A: Given Work done W = 2500 J Time taken t = 1 min = 60 second

Q: A horse pulls a cart with a force of 0.2 kN at an angle of 27 degrees with the horizontal and moves…

A: Work done on a body can be said to happen when due to the force applied on the body, there is a…

Q: Force is defined as the speed at which work is performed. The unit of power is wet (W = 1 Js– 1).…

A: Write the given values with suitable variables. E=8000 kJt=24 hrs=86400 s Here, E and t are the…

Q: A warehouse employee is pushing a 200.0KG desk across a floor at a constant speed of 2m/s.How much…

A: Given: The mass of the desk is 200.0 kg. The initial velocity of the desk is 2.00 m/s. The final…

Q: How much work would have to be done to bring a 970-kg automobile traveling at 72 km/h to a stop?__ J

A: Consider an automobile having mass m moving with initial speed vi.

Q: If a runner's power is 500 W as she runs, how much chemical energy does she convert into other forms…

A: Given data,  Runner's power P= 500 W The runner runs for total time of,  ∆t = 20 minutes = 20 x 60…

Q: A 20.0-kg child descends a slide 1.90 m high and reaches the bottom with a speed of 1.35 m/s . a)…

A: As we know, Kinetic energy (KE) = 1/2 mv2  --------(1) where m is the mass of a child and v is…

Q: A rocket sled having a mass of 1,501 kg reaches a speed of 352 m in 9.5 seconds. What average power…

A:

Q: How much work must be done to stop a 1300-kg car traveling at 110 km/h? (Hint: You will need to…

A:

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.