A car moving at 30 miles/hour has roughly 100,000 J of kinetic energy. You need to...
A car moving at 30 miles/hour has roughly 100,000 J of kinetic energy. You need to keep your foot on the gas to maintain your speed (assume a flat road). The gas you burn represents 500 J of chemical energy every second. (show work)
a. After 5 minutes, how much energy have you
generated by burning gasoline?
b. How much kinetic energy does your car have at
this time?
c. If this number is not 100,000 J, explain why.
If this number is 100,000 J, explain what happened to the extra
energy you calculated in part a.
Homework Answers
a. Energy burnt per second=500 J.
So, energy burnt in 5 minutes=500*5*60=150,000 J
b)According to the problem,the car maintains its speed.
kinetic energy=1/2mv2 where m is mass and v is velocity. v is constant, as the car maintains its speed , and mass of car, m , is obviously constant.
So,kinetic energy is constant. Hence,kinetic energy=100,000 J
c)Extra energy supplied in part a is used to overcome friction and is lost as heat. So, it does not result in increase in kinetic energy.
Add Answer to:
A car moving at 30 miles/hour has roughly 100,000 J of kinetic
energy. You need to...
Atoms can bond to other atoms to make molecules. Atoms sometimes break these bonds and form...
Atoms can bond to other atoms to make molecules. Atoms sometimes break these bonds and form them in a different way. For example, it is possible to take two molecules of hydrogen (H_2) and one molecule of oxygen (O_2), put them near one another, give them a little spark to help them start a reaction, and you will end up with two molecules of water (H_2O). Do you see what happened? Some of the H-H bonds and the O-O bonds...
A rocket with a mass of 2.20×1062.20×106 kg has a relativistic kinetic energy of 2.00×10232.00×1023 J....
A rocket with a mass of 2.20×1062.20×106 kg has a relativistic kinetic energy of 2.00×10232.00×1023 J. How fast is the rocket moving? Can you please explain how you came to your answer as well? I keep seeing people putting gamma signs into their equations and I don't know what that means since we didn't learn it that way.
You are to do a cash-flow and then net present value analysis of a car purchase....
You are to do a cash-flow and then net present value analysis of a car purchase. You have a choice beween a Chevrolet Bolt electric car costing $35,000 (after tax incentives) that has an electric motor efficiency of 4.2 miles per kWh (6.7 km/kWh), and a Honda Civic Hybrid that costs $25,000 and has a gas mileage of 45 miles/gallon (5.3 liters/100 km). Assume an initial gasoline cost of $2.50 per escalating at 5%/yr over the ten-year lifetime of the...
Name 37) You have been hired as an expert witness in a crash investigation. Car A of mass 1900 kg crashed into stationary car B of mass 1000 kg. You measure the coefficient of kinetic friction betwee...
Name 37) You have been hired as an expert witness in a crash investigation. Car A of mass 1900 kg crashed into stationary car B of mass 1000 kg. You measure the coefficient of kinetic friction between the locked tires a was in park so the tires did not turn). Car A hits car B, locking bumpers so that they s bef nd the road to be 0.6 (car B kid off together. They skid 20 m ore coming to...
Multiple Choice. Select the best option. You do not need to show your work. S Two...
Multiple Choice. Select the best option. You do not need to show your work. S Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel can push for 5.0 min onger. Compare the work they do. A) Both men do positive work, but Joel does 75% more work than Jerry. B) Both men do positive work, but Joel does 50% more work than Jerry C) Both men do positive work, but Jerry does 50%...
Question 1 1 pts What is the kinetic energy of a man who weighs 980N who...
Question 1 1 pts What is the kinetic energy of a man who weighs 980N who is riding in a car traveling 40 km per hour? Express your answer in Joules, but don't type the unit in the answer box. Round to the nearest whole number. (Careful with the units) 1 pts Astudent slides her 80.0-kg desk across the level floor of her dormitory room a distance 4.00 m at constant speed. If the coefficient of kinetic friction between the...
1. You have just purchased a new house and taken a mortgage for $100,000. The interest rate...
1. You have just purchased a new house and taken a mortgage for $100,000. The interest rate is 12% compounded monthly and you will make payments for 25 years. a) Find the size of the monthly payment. b) The bank has a policy of rounding the payments up to the next cent. Find the new monthly payment and compute a new n. c) What was the balance of the loan after three periods? d) How much of your third payment was Principal? Interest? e) How much did...
Please help me answer this question it 1 question from A to J. PHY HW. •...
Please help me answer this question it 1 question from A to J.
PHY HW.
• Moments of inertia formulas are provided on the last page of this document • Show all of your work when solving equations. It is not sufficient to merely have a correct numerical answer. You need to have used legitimate equations and algebra. You also need to have correctly used the data. • Units must be specified for any isolated number, not just your final...
24. The energy rewed during the splining or 10. Which of the ding material transform fusing...
24. The energy rewed during the splining or 10. Which of the ding material transform fusing of atomic aclelis cecelery to hestene a) Chemical egy by Electrical energy het bell e) Noclear en electrice Heather d) Electric guitar 25. Which of the following appliances changes 31. Which of the following appliances asform electrical energy to und energy! (s) clectrical energy to sound energy Refrigerator motor It Electric guitar a) Cooker b) Guia Il Radio Microwave a) I only d) Electricire...
INTRODUCTION Rebecca shook her head and gave a loud sigh as she hung up the phone...
INTRODUCTI0NRebecca shook her head and gave a loud sigh as she hung up the phone from talking with her dad."What is it?" her roommate Claire asked."Per usual, Daddy Jim wants me to use my 'schooling, as he likes to call it, to help him decide whether to buy a new crew cab truck with either a diesel or a gas engine," Rebecca replied."Well, maybe he will forget all about it if you just wait him out, "Aaire offered."Oh no, you...
Atoms can bond to other atoms to make molecules. Atoms sometimes break these bonds and form them in a different way. For example, it is possible to take two molecules of hydrogen (H_2) and one molecule of oxygen (O_2), put them near one another, give them a little spark to help them start a reaction, and you will end up with two molecules of water (H_2O). Do you see what happened? Some of the H-H bonds and the O-O bonds...
Name 37) You have been hired as an expert witness in a crash investigation. Car A of mass 1900 kg crashed into stationary car B of mass 1000 kg. You measure the coefficient of kinetic friction between the locked tires a was in park so the tires did not turn). Car A hits car B, locking bumpers so that they s bef nd the road to be 0.6 (car B kid off together. They skid 20 m ore coming to...
Multiple Choice. Select the best option. You do not need to show your work. S Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel can push for 5.0 min onger. Compare the work they do. A) Both men do positive work, but Joel does 75% more work than Jerry. B) Both men do positive work, but Joel does 50% more work than Jerry C) Both men do positive work, but Jerry does 50%...
Question 1 1 pts What is the kinetic energy of a man who weighs 980N who is riding in a car traveling 40 km per hour? Express your answer in Joules, but don't type the unit in the answer box. Round to the nearest whole number. (Careful with the units) 1 pts Astudent slides her 80.0-kg desk across the level floor of her dormitory room a distance 4.00 m at constant speed. If the coefficient of kinetic friction between the...
Please help me answer this question it 1 question from A to J.
PHY HW.
• Moments of inertia formulas are provided on the last page of this document • Show all of your work when solving equations. It is not sufficient to merely have a correct numerical answer. You need to have used legitimate equations and algebra. You also need to have correctly used the data. • Units must be specified for any isolated number, not just your final...
24. The energy rewed during the splining or 10. Which of the ding material transform fusing of atomic aclelis cecelery to hestene a) Chemical egy by Electrical energy het bell e) Noclear en electrice Heather d) Electric guitar 25. Which of the following appliances changes 31. Which of the following appliances asform electrical energy to und energy! (s) clectrical energy to sound energy Refrigerator motor It Electric guitar a) Cooker b) Guia Il Radio Microwave a) I only d) Electricire...
Most questions answered within 3 hours.
-
I propose to you a game. You roll 2 dice. If the sum of the
numbers...
asked 29 minutes ago -
Select the most likely lattice types for each of the following
salts: (a) BeF2; (b) CaO;...
asked 34 minutes ago -
a
ball is thrown downward with velocity of 10m/s. calculate the final
velocity if it reaches...
asked 1 hour ago -
How many grams of ice at -15°C must be added to 705 grams of
water that...
asked 2 hours ago -
2. Balance sheet
The balance sheet provides a snapshot of the financial condition
of a company....
asked 2 hours ago -
In week 1 of the chemical equilibrium experiment, you and your
lab team will create a...
asked 3 hours ago -
Identify and describe five (5) characteristics of a good KM
measurement system. Be sure to include...
asked 3 hours ago -
What are at least five (5) workplace wellness best practices for
a successful wellness program? Explain...
asked 3 hours ago -
A pharmaceutical company is testing a new drug. Of the 110
people that received the drug,...
asked 3 hours ago -
Which of the following is NOT a mechanism for gene
regulation?
a. Phase variation in DNA....
asked 3 hours ago -
Which of the following is being applied when, under certain
conditions, the value recorded for an...
asked 3 hours ago -
Describe the role of the three components of connective
tissue. In what ways does a connective...
asked 3 hours ago