Suppose a car travels 108 km at a speed of 35.0 m/s, and uses 2.20 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 1.30 ✕ 108 J per gallon.) (a) What is the force (in N) 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

Question
Suppose a car travels 108 km at a speed of 35.0 m/s, and uses 2.20 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 1.30 ✕ 108 J per gallon.)
(a)
What is the force (in N) 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

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Science
Physics

Newtons Laws of Motion

Related Physics Q&A

Find answers to questions asked by students like you.

Q: a system consisting ofthree charges, q1 = +5.00 mC, q2 = +5.00 mC, and q3 = -5.00 mC,at the vertices...

A: Given, q1=+5.00 mC,q2=+5.00 mC, q3=-5.00 mC, and length d=2.95 cm of the sides.

Q: A 300 Kg red bumper car is traveling with a velocity of +2.5 m/s. Over a 0.5 second time frame it ha...

A: Given data Mass of the red car ,mr=300 kg Mass of black car, mb=500 kg Initial velocity of red car, ...

Q: The position of a particle after t seconds is given by s = (t + 1) ln(t + 1) − 2t, where s is measur...

A: Click to see the answer

Q: A person rides on a Ferris wheel that rotates with constant angularspeed. If the Sun is directly ove...

A: The person's shadow on the ground undergoes periodic motion with the same period as the period of th...

Q: A ball with mass (m) collides elastically with a second ball that is at rest, and recoils with a spe...

A: In an ellastic collision, the velocity ball with mass (m) after the collision is as follows: v1=m1-m...

Q: • A 3.55-g bullet embeds itself in a 1.47-kg block, which is attachedto a spring of force constant 8...

A: Click to see the answer

Q: One mole of an ideal monatomic gas is initially at a temperature of 274 K. (a) Find the final temper...

A: Given Data: Initial temperature of the gas is T1 = 274 K. The heat supplied is Q = 3260 J. The work...

Q: Suppose 7.5 * 1010 electrons are transferred to a balloon by rubbing it on your hair. Treating the b...

A: number of electrons, n = 7.5 x 1010  distance, r = 0.15 m 

Q: Find the magnetic flux through a round coil of wire which has an area of 75cm2. The magnetic field s...

A: Given: The area is A=75 cm2. The magnetic field strength is B=7 T. The angle made by magnetic field...

Q: 1. We will be accelerating a cart on a track by inclining the track at a small angle. Initial positi...

A: Hello. Since your question has multiple parts, we will solve first question for you. If you want rem...

Q: If s represents the displacement andt represents the time for an object moving with rectilinear moti...

A: Hello. Since your question has multiple parts, we will solve first question for you. If you want rem...

Q: Feeling a bit cool, you turn up the thermostat in your living room. A short time later the air is wa...

A: From the ideal gas law we have PV=nRT where P=PressureV=Volumen=Number of molesR=Gas constantT=Tempe...

Q: Taking a break from hiking up a steep hill, a hiker stands still on the incline. What are the forces...

A: The free body diagram of the system is 

Q: A 117-g lead ball is dropped from rest from a height of 7.62 m.The collision between the ball and th...

A: mass, m = 117 g  height, h =7.62 m  specific heat, c = 160 J/kg C 

Q: In uniform circular motion, how does the acceleration change when the speed is increased by a factor...

A: speed is increased by a factor of 3 When the radius is decreased by a factor of 2

Q: A 0.2 Kg baseball is pitched at 40 m/s. The batter hits the ball back to the pitcher at 60 m/s. a) F...

A: Given quantities: Mass of the baseball (m) = 0.2 kg initial velocity of the baseball (u) = + 40 m/s ...

Q: A constant-volume gas thermometer hasa pressure of 80.3 kPa at -10.0 °C and a pressure of 86.4 kPa a...

A: The first condition of the constant volume thermometer is, The second condition of the constant vol...

Q: A system consists of 3.5 mol of an ideal monatomic gas at 315 K.How much heat must be added to the s...

A: The system consists of moles of an ideal monatomic gas, n=3.5 mol   The temperature of an ideal mona...

Q: A butterfly flies from the top of a tree in the center of a garden to rest on top of a red flower at...

A: Width traveled, w = 12 / 2 =6 m  height, h = 8 m 

Q: Express, in percent, the difference in gravitational force when an object is located at sea level (1...

A: Solution: Givent that To express gravitational force when an object is located at sea level (1m) vs ...

Q: Raindrops hitting the side windows of a car in motion often leave diagonal streaks even if there is ...

A: In this case, the car moves in a horizontal direction relative to the ground. The raindrops fall in ...

Q: Mr. Denzel weighs a svelte 880 newtons here on Earth. On the Moon, he would probably weigh: (feel fr...

A: Click to see the answer

Q: A high school track coach has just purchased a new stopwatch. The stopwatch manual states that the s...

A: Given: Uncertainty of stopwatch = ±0.05 s Regular Spring record is 11.49 s to 15.01 s The first spri...

Q: Short Finned Pilot Whale can dive to depths of 1.1 kilometers. What is the total pressure they exper...

A: Pressure inside a depth of h is; P=ρgh Here, ρ is density of fluid, g is acceleration due to gravity...

Q: Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the...

A: efficiency =  95 %  Voltage, V =  12 V mass, m  = 750 kg initial velocity, u = 0  m/s final velocity...

Q: Two electric charges are separated by a finite distance. Somewhere between the charges, on the line ...

A: The expression for the electric field is, E=q4πε0r2 Here, q is the charge, r is the distance between...

Q: Parts g,h and i

A: Parts g, h, i are asked to be solved. But to give a quantitative solution, it is necessary to find p...

Q: An unknown planet (mass is equal to 4.26 x 10^24 kg) is orbiting around the sun (mass of the sun is ...

A: Given: The mass of unknown planet is 4.26x1024 kg. The mass of the sun is 6.623703x1035 kg. The forc...

Q: Calculate the mass of an astronaut that weighs 291N on the surface of the moon; the gravity of the m...

A: The expression for mass in term of weight is m=Wg=W16gE

Q: Aluminum has a density of 2.712 ✕ 103 kg/m3 at 0°C and an average linear expansion coefficient of 2....

A: Click to see the answer

Q: When viewed through a magnifying glass, a stamp that is 1.9 cm  wide appears upright and 5.2 cm wide...

A: Click to see the answer