Question

Suppose a car travels 108 km at a speed of 35.0 m/s, and uses 1.80 gallons 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 1.3 ✕ 10^{8} J per gallon.)(a) What is the force exerted to keep the car moving at constant speed?

N

(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?

gallons

Step 1

(a). The amount of work done to keep the car moving at constant speed can be calculated as follows,

Step 2

Write the expression for work done, substitute the corresponding values, an...

Tagged in

Q: Suppose a soccer player boots the ball from a distance 27.5 m into the goal. Find the initial spee...

A: Here the figure shows a ball projected from the origin with initial velocity u at an angle θ with th...

Q: It has been claimed that an insect called the froghopper (Philaenus spumarius) is the best jumper in...

A: Write the information given in the question. Consider v as the velocity of froghopper after it has a...

Q: I don’t understand p 4.12.

A: Given,

Q: 4) a car mass 1,000kg collides head on with a large truck of a mass 10,000kg. 4a) the truck exerts a...

A: Given that the mass of the car is 1000kg, and mass of the truck is 10000kg.(a) According to newton’s...

Q: Water leaves a fireman’s hose (held near the ground) with an initial velocity v0 = 10.5 m/s at an an...

A: This is a projectile motion problem.From kinematics, the time to reach the maximum height is,

Q: In the following figure m1 = 20.0 kg and α = 52.9 ∘. The coefficient of kinetic friction between the...

A: Find the acceleration needed to cover the distance in given time.Substitute the value,

Q: I need help with question p 3.25

A: The maximum height reached by projectile is,

Q: You are in a research vehicle chasing tornadoes, You receive a call that a tornado has been sighted ...

A: Given:Position of tornado = 45 km, 12 degrees south of west relative to St LouisPosition of me = 55k...

Q: 7a. You pull a wagon along a level floor using a rope oriented horizontally in the positive x-direct...

A: Here,Fx = Pulling force that acts in rightward (i.e. + x-direction).N = Normal Reaction acting in up...

Sorry about that. What wasn’t helpful?