2. A car of mass 1000kg accelerates to 10ms (a) Calculate the gain in KE of the car. (b) If the engine is 50% efficient how much energy was put into the engine?

Q: A volcano spews a 350kg rock vertically upward to a height of 550m. (a) With what velocity was the…

A:

Q: Please help! Thank you! A 68.4-kg sky diver jumped out of an airplane at an altitude of 0.900 km.…

A: Given Data : The mass of the skydiver is given as m = 68.4 Kg. The height of the skydiver initially…

Q: 1. A 20kg block slides down a slide that is 3.0m high. When it reaches the bottom of the slide, the…

A: Given:mass of block, m = 20 kgheight of slide, h = 3 mspeed of the block, v = 1 m/s

Q: .An electric motor has a power output of 1.5 kw. If it operates at 75% efficiency, what work can it…

A: N = 1.5 kW efficiency , = 75% To find = a) Work done in one hour in Joules                 b) Work…

Q: 4. An engine that worked for 46 s consumed E = 23,500 J and lifted a in 75 kg body from the ground…

A: Work done for lifting an object from the ground is equal to change in the gravitational potential…

Q: How much work is done (how much energy is required) to accelerate a 1987.5 kg car entering the…

A: According to  work-energy theorem work done is equals to changes in between Final kinetic energy and…

Q: 3. A contestant in a winter sporting event pushes a 45.0-kg block of ice across a frozen lake as…

A: When the block is moved, some Kinetic friction force acts on the block in opposite direction which…

Q: An engine doing work isothermally takes in 10kJ and exahusts 1kJ. What is the efficiency of the…

A: Heat takes the engine,                               Heat exhausts the engine,…

Q: An engine, operating with an efficiency of 0.225,  delivers 8.10 ✕ 105 J each minute. What is the…

A:

Q: A 1600 kg car steadily accelerates from rest to 60 mi/hr over a 2.8 second time span. How much work…

A: Given:mass of car, m = 1600 kgfinal velocity, vf = 60 mi/hr = 26.816 m/s

Q: If the efficiency of a coal-fired electrical generating plant is 35%, then what do we mean when

A: Law of Conservation of Energy: The Law of Conservation of Energy states that the total energy of an…

Q: 2. How much work is done by 15 kW engine during 3.5 min?

A: Given value--- power = 15 kW. time = 3.5 min . We have to find--- work ?

Q: 27.) W out is always smaller than W in because when a machine is used, not all of the energy it…

A: 27. When a machine is used, due to the friction some of the input energy convert in to thermal…

Q: 2. Calculate the work done in the following cyclical system: P 3x105 exlos N/m? a lom3 5om? V

A:

Q: 3. An automobile having a mass of 2200 kg travels up a 7° slope at a constant speed of v = 100 km/h.…

A:

Q: A truck mass of m=1210kg drives up an incline at a constant speed of v = 12.7 m/s. The forces of air…

A:

Q: 1- An 18,000g object is accelerated at 2m / s', if the object is displaced 40m. What is the work…

A:

Q: You give a 5.0 kg box a quick shove up a ramp. It reaches a vertical height of 3.0 m before…

A: m = 5 kg h = 3 m vf = 0 m/s (Eth)f = 100 J g = 10 m/s2

Q: A cheetah can accelerate from rest to 7.4 m/s (about 18 m/h) in 1.8 seconds. How much average power…

A:

Q: A textbook claims that walking at a speed of 1.39 m/s requires a power output Pwalk=280 W. The basal…

A:

Q: 6. Determine the approximate work rate (in Mets) for running on a treadmill at a speed of 5.0 mph…

A:

Q: A car with mass of 1138 kg accelerates from 0 m/s to 40.0 m/s in 10.0 s. Ingnore air resistance. The…

A: Solution:   Given Values, Mass (m)=1138 Kginitial velocity(u)=0 m/sfinal velocity(v)=40…

Q: 3. Determine the % efficiency of a four-stroke gasoline engine consumes 93000 J of energy in doing…

A: Given data:  Energy input (Qin) = 93000 J Work done (W) = 31000 J Required: The efficiency in…

Q: A student drags a 3 kg box 5 m across a rough floor with a force of 40 N. A frictional force of 10 N…

A:

Q: Pressure B C ЗР Po = 1.0 atm Vo = 100 L Po D Volume Vo 3Vo

A: The process AB is a constant volume process.

Q: Calculate the input power P of the engine, the mechanical work W it produced and its output power P,…

A: (b) The input power of the engine is the rate at which the energy is consumed by the engine. From…