1. Say there is a 50 lb dog in a car traveling 40 mph. The car...
1. Say there is a 50 lb dog in a car traveling 40 mph. The car
comes to an abrupt stop. What is the KE of the dog?
2. Now calculate the KE of a bullet with a mass of 4 grams and a
speed of 1000 m/s.
Calculate your final results in SI units. How do they compare? What
can you conclude from this scenario?
Homework Answers
3. A car is traveling at 55 MPH? a) What does it mean to say that this car is traveling at 55 MPH? b) How many mil...
3. A car is traveling at 55 MPH? a) What does it mean to say that this car is traveling at 55 MPH? b) How many miles the car will cover in 120 minutes? 4. You are driving at 18 m/s, and a cat runs out in front of your car. You stop rani which takes 3 seconds, and miss the cat. What is your deceleration? 5. A car traveling in a straight line with an initial velocity of 10...
A car that weighs 2200 kg traveling at 55 mph comes to a stop. If the...
A car that weighs 2200 kg traveling at 55 mph comes to a stop. If the brake discs (pads) are 20 lbs in mass and made of iron, what is the temperature of the brakes after you come to a quick stop (assume you have four equivalent brake pads)?
Question 1 given A car skids 185 ft down a 3% grade to stop. Friction factors are as follows. Vo (mph) 50 40 60 30 0.45...
Question 1 given A car skids 185 ft down a 3% grade to stop. Friction factors are as follows. Vo (mph) 50 40 60 30 0.45 0.51 0.35 0.59 What is the speed at the beginning of the skid? Question 1 given A car skids 185 ft down a 3% grade to stop. Friction factors are as follows. Vo (mph) 50 40 60 30 0.45 0.51 0.35 0.59 What is the speed at the beginning of the skid?
Question 1...
PHYS 110 Lab #6 Wrap up question 1: Say the car in Collision B (1000 kg,...
PHYS 110 Lab #6 Wrap up question 1: Say the car in Collision B (1000 kg, 100 mph) takes 0.2 seconds to come to a stop rather than 0.1 s. Would you expect the damage to be the same as before, or would it be less? Justify your answer with a force comparison. Wrap up question 2: Using your energy numbers from your measurements, explain why the impact of the 100 mph car is more than twice as bad in...
Problem 1 (50): A 3100 lb car has a 5-speed manual transmission with in = 3.22,...
Problem 1 (50): A 3100 lb car has a 5-speed manual transmission with in = 3.22, 1,2 = 2.15, 1,4 = 1.05, 1,5 = 0.68. The final drive ratio 3.08. The air drag coefficient is 0.29 and the front projected area is 22 square feet. The rolling resistance coefficient is 0.02 and the tire radius is 11 inches. The mass factor is 1.0. The drive train efficiency is 0.93. The engine wide-open-throttle output is shown in the figure. a) Determine...
Problem 1 (50): A 3100 lb car has a 5-speed manual transmission with i;= 3.22, 12...
Problem 1 (50): A 3100 lb car has a 5-speed manual transmission with i;= 3.22, 12 = 2.15, 14 = 1.05, 1,5 = 0.68. The final drive ratio 3.08. The air drag coefficient is 0.29 and the front projected area is 22 square feet. The rolling resistance coefficient is 0.02 and the tire radius is 11 inches. The mass factor is 1.0. The drive train efficiency is 0.93. The engine wide-open-throttle output is shown in the figure, a) Determine the...
Part 2 (Choose 3 Nom TUTT I 1. A race car starts from rest and travels...
Part 2 (Choose 3 Nom TUTT I 1. A race car starts from rest and travels 400 meters in 5.2 seconds. When it crosses the finish line it has a final velocity of 140 m/s. a) What is the acceleration (a) of this car? b) How much time was spent traveling from 100 m/s to 140 m/s? c) If this car continued at this rate of acceleration, how long would it take for it to travel 800 meters? 2. A...
6. A 50-kg front seat passenger in a car moving initially with a speed of 25...
6. A 50-kg front seat passenger in a car moving initially with a speed of 25 m/sisbr rest by an air bag in a time of 0.4 s a) What is the impulse acting on the passenger? b) What is the average force acting on the passenger in this process?? 7. A ball traveling with an initial momentum of 5.0 kg.m/s bounces off a wall and comes back in the opposite direction with a momentum of -4.5 kg.m/s a) What...
Problem 1: A car of mass 1000 kg moves at a constant speed of 20 m/s...
Problem 1: A car of mass 1000 kg moves at a constant speed of 20 m/s along a horizontal road where a frictional force is 200N. Calculate the power developed by the engine. If the car now moves up an incline at the same constant speed, calculate the new power developed by the engine. Assume that the frictional force is still 200 N and that sin(theta)=1/20 where theta is the angle of the incline to the horizontal. Problem 2: An...
Suppose a small compact car with a mass of 1000 kg is traveling north on Morewood...
Suppose a small compact car with a mass of 1000 kg is traveling
north on Morewood Avenue at a speed of 15 m/s. At the intersection
of Morewood and Fifth Avenues, it collides with a truck with a mass
of 2000 kgthat is traveling east on Fifth Avenue at 10 m/s. It’s
now 2 seconds after the collision has occurred. Fortunately, all
occupants were wearing seat belts and there were no injuries, but
the two vehicles became thoroughly tangled and...
3. A car is traveling at 55 MPH? a) What does it mean to say that this car is traveling at 55 MPH? b) How many miles the car will cover in 120 minutes? 4. You are driving at 18 m/s, and a cat runs out in front of your car. You stop rani which takes 3 seconds, and miss the cat. What is your deceleration? 5. A car traveling in a straight line with an initial velocity of 10...
Question 1 given A car skids 185 ft down a 3% grade to stop. Friction factors are as follows. Vo (mph) 50 40 60 30 0.45 0.51 0.35 0.59 What is the speed at the beginning of the skid? Question 1 given A car skids 185 ft down a 3% grade to stop. Friction factors are as follows. Vo (mph) 50 40 60 30 0.45 0.51 0.35 0.59 What is the speed at the beginning of the skid?
Question 1...
Problem 1 (50): A 3100 lb car has a 5-speed manual transmission with in = 3.22, 1,2 = 2.15, 1,4 = 1.05, 1,5 = 0.68. The final drive ratio 3.08. The air drag coefficient is 0.29 and the front projected area is 22 square feet. The rolling resistance coefficient is 0.02 and the tire radius is 11 inches. The mass factor is 1.0. The drive train efficiency is 0.93. The engine wide-open-throttle output is shown in the figure. a) Determine...
Problem 1 (50): A 3100 lb car has a 5-speed manual transmission with i;= 3.22, 12 = 2.15, 14 = 1.05, 1,5 = 0.68. The final drive ratio 3.08. The air drag coefficient is 0.29 and the front projected area is 22 square feet. The rolling resistance coefficient is 0.02 and the tire radius is 11 inches. The mass factor is 1.0. The drive train efficiency is 0.93. The engine wide-open-throttle output is shown in the figure, a) Determine the...
Part 2 (Choose 3 Nom TUTT I 1. A race car starts from rest and travels 400 meters in 5.2 seconds. When it crosses the finish line it has a final velocity of 140 m/s. a) What is the acceleration (a) of this car? b) How much time was spent traveling from 100 m/s to 140 m/s? c) If this car continued at this rate of acceleration, how long would it take for it to travel 800 meters? 2. A...
6. A 50-kg front seat passenger in a car moving initially with a speed of 25 m/sisbr rest by an air bag in a time of 0.4 s a) What is the impulse acting on the passenger? b) What is the average force acting on the passenger in this process?? 7. A ball traveling with an initial momentum of 5.0 kg.m/s bounces off a wall and comes back in the opposite direction with a momentum of -4.5 kg.m/s a) What...
Problem 1: A car of mass 1000 kg moves at a constant speed of 20 m/s along a horizontal road where a frictional force is 200N. Calculate the power developed by the engine. If the car now moves up an incline at the same constant speed, calculate the new power developed by the engine. Assume that the frictional force is still 200 N and that sin(theta)=1/20 where theta is the angle of the incline to the horizontal. Problem 2: An...
Suppose a small compact car with a mass of 1000 kg is traveling
north on Morewood Avenue at a speed of 15 m/s. At the intersection
of Morewood and Fifth Avenues, it collides with a truck with a mass
of 2000 kgthat is traveling east on Fifth Avenue at 10 m/s. It’s
now 2 seconds after the collision has occurred. Fortunately, all
occupants were wearing seat belts and there were no injuries, but
the two vehicles became thoroughly tangled and...
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