Question 10A truck travelling at a speed of 80 km/h has a kinetic energy of 1000 kJ. If the speed of the truck is decreased to 40 km/h, the kineticNot yetenergy of the truck will beansweredMarked out ofO a. 1000 kJ1.00P Flag questionO b. 2000 kJOc.250 kJO d. 500 kJ

Kinetic energy of an object is measure of energy attained by the object due to its motion. It…

A truck travelling at a speed of 80 km/h has a kinetic energy of 1000 kJ. If the speed of the truck is decreased to 40 km/h, the kinetic energy of the truck will be O a. 1000 kJ O b. 2000 kJ O. 250 kJ O d. 500 kJ

A truck travelling at a speed of 80 km/h has a kinetic energy of 1000 kJ. If the speed of the truck is decreased to 40 km/h, the kinetic energy of the truck will be O a. 1000 kJ O b. 2000 kJ O. 250 kJ O d. 500 kJ

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter7: Work And Kinetic Energy

Section: Chapter Questions

Problem 49P: An 8.0-g bullet has a speed of 800 m/s. (a) What is its kinetic energy? (b) What is its kinetic...

See similar textbooks

Related questions

Q: The work required to accelerate an object initially at rest to a speed v f is W. What is the…

A: (1) According to the work energy theorem, the equation can be written as W=ΔKEW=12mvf2-0W=12mvf2…

Q: child going sledding gets pushed by her parent until she had a speed of 10 m/s. She then starts down…

A: a) Energies considered in this system 1) Kinetic Energy of sled 2) Potential Energy of the total…

Q: 11. Airflow lifts a 3.6 kg bird 50 m up. How much work was done by the flow?

A: We know that, Law of conservation of energy states that energy can neither be created nor…

Q: 2. A 10-kg mass is dragged on a horizontal frictionless surface by a force F(x) = 2x + 1 (N) that…

Q: a toy car (0.50kg) runs on a frictionless trackand has an initial kinetic energy of KE =1.6. over…

Q: A 1200 kg car going 30 m/s applies its brakes and skids to rest. If the friction force between the…

A: Given Data, Question-1 Mass of the Car(m)=1200 kg Initial Speed of the car(u)= 30 m/s Friction Force…

Q: A bicycle and rider going 12 m/s approach a hill. Their total mass is 57 kg. (a) What is their…

A: Given Data : speed of the rider, v = 12 m/s total Mass of the rider and the bicycle, m = 57 kg Since…

Q: A 5-kg mass mass is projected straight up with a speed of 15 m/s. a. To what height does the mass…

Q: An accelerating object of mass m=5 kg is fired with an initial speed v;=9 m/s at a starting point.…

Q: The kinetic energy of a 3.0 kg object moving at a speed of 9.3 m/s would be: а. 130 J b. 260 J с. 28…

A: Given that,Mass, m=3.0 kgVelocity, v=9.3 m/s

Q: A 150-N crate slides with constant speed a distance of 10 m downward along a rough slope that makes…

A: The crate, having a 150 N weight is sliding down the incline at a constant speed. This means that…

Q: 2. A hand gun fires a 7.50g bullet at a speed of 377m/s. A. Calculate the bullet's kinetic energy.…

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: Find the work done in joules by gravity as an object of the mass m=14 kg is raised up at constant…

A: Mass of object m = 14 kg Initial height h1 =34 m Final height h2 = 75 m g = 10 m/s² Concept…

Q: An accelerating object of mass m=12 kg is fired with an initial speed v;-5 m/s at a starting point.…

A: Given: The mass of the body is 12 kg. The initial velocity of the object is 5 m/s. The final kinetic…

Q: ind the work done in joules by gravity as an object of the mass m=15 kg is raised up at constant…

A: Mass (M)= 15kg Value of g=10m/S2 Height change from 35 to 69

Q: Q:3 a) Determine the kinetic energy of a 625-kg roller coaster car that is moving with a speed of…

Q: a.) A student is riding a bicycle at a constant speed of 6.0 m/s on a level road. The mass of the…

A: (a) Given- Speed v= 6.0 m/s Force F = 35 N The student's output power is…

Q: 2.00-kg ball has zero kinetic and potential energy. Ernie drops the ball into a 10.0-m-deep well.…

Q: A moving object is subject to conservative forces only. When its kinetic energy dereases by 10 J,…

A: Answer:- (B) It increase by 10 J A moving object is subject to conservative forces only. When its…

Q: A 150 g baseball is thrown straight up. If it is released at a height of 1.0 m above the ground…

A: Given data: Mass of ball (m) = 150 g = 0.150 kg Initial height (h0) = 1.0 m Initial kinetic energy…

Q: when 2.0 kg rock is dr ped from a cliff, it hits the beach at a speed of 24 m/s. If a 4.0kg lock…

Concept explainers

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.

Question

100%

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Concept and Principle:

VIEW

Calculation:

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.

Similar questions

Suppose a car travels 108 km at a speed of 30.0 m/s, and uses 2.0 gal of gasoline. Only 30 of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is about 140 Mi/gal.) (a) What is the magnitude of the force exerted to keep the car moving at constant speed? (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s?
Integrated Concepts (a) What force must be supplied by an elevator cable to produce an acceleration of 0.800 m/s2 against a 200-N frictional force, if the mass of the loaded elevator is 1500 kg? (b) How much work is done by the cable in lifting the elevator 20.0 m? (c) What is the final speed of the elevator if it starts from rest? (d) How much work went into thermal energy?
A 100 — kg man is skiing across level ground at a speed of 8.0 m/s when he comes to the small slope 1.8 m higher than ground level shown in the following figure. (a) If the skier coasts up the bill, what is his speed when he reaches the top plateau? Assume friction between the snow and skis is negligible. (b) What is his speed when he reaches the upper level if an 80 — N frictional force acts on the skis?
A student has the idea that the total work done on an object is equal to its final kinetic energy. Is this idea true always, sometimes, or never? Ii it is sometimes true, under what circumstances? If it is always or never true, explain why.
(a) How long will it take an 850-kg car with a useful power output of 40.0 hp (1hp=746W) to reach a speed of 15.0 m/s, neglecting friction? (b) How long will this acceleration take if the car also climbs a 3.00-m-high hill in the process?
Physics Review A team of huskies performs 7 440 J of work on a loaded sled of mass 124 kg, drawing it from rest up a 4.60-m high snow-covered rise while the sled loses 1 520 J due to friction, (a) What is the net work done on the sled by the huskies and friction? (b) What is the change in the sleds potential energy? (c) What is the speed of the sled at the top of the rise? (See Section 5.5.)
Ignoring details associated with friction, extra forces exerted by arm and leg muscles, and other factors, we can consider a pole vault as the conversion of an athlete’s running kinetic energy to gravitational potential energy. If an athlete is to lift his body 4.8 m during a vault, what speed must he have when he plants his pole?
In the Back to the Future movies (https://openstaxcollege.org/l/2lbactofutclip), a DeLorean car of mass 1230 kg travels at 88 miles per hour to venture back to the future. (a) What is the kinetic energy of the DeLorean? (b) What spring constant would be needed to stop this DeLorean in a distance of 0.1m?
(a) What is the efficiency of an out-of-condition professor who does 2.10105J of useful work while metabolizing 500 kcal of food energy? (b) How many food calories would a well-conditioned athlete metabolize in doing the same work with an efficiency of 20%?
Consider the following scenario. A car for which friction is not negligible accelerates from rest down a hill, running out of gasoline after a short distance. The driver lets the car coast farther down the hill, then up and over a small crest. He then coasts down that hill into a gas station, where he brakes to a stop and fills the tank with gasoline. Identify the forms of energy the car has, and how they are changed and transferred in this series of events. (See Figure 7.34.) Figure 7.34 A car experiencing non-negligible friction coasts down a hill, over a small crest then dill again, and comes to a stop at a gas station.
A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 25.0° below the horizontal. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by the gravitational force? (c) What is the work done on the cart by the shopper? (d) Find the force the shopper exerts, using energy considerations. (e) What is the total work done on the cart?
An 8.0-g bullet has a speed of 800 m/s. (a) What is its kinetic energy? (b) What is its kinetic energy if the speed is halved?