A speeding driver sees a police officer, hits her brakes, and changes her speed from 45...
A speeding driver sees a police officer, hits her brakes, and changes her speed from 45 MPH to 30 MPH in 1.4 seconds. What was her average acceleration (in m/s2) during this time?
A unicorn running on a beach at 7 m/s changes speed at a constant rate of 3.8 m/s2 over a period of 3 seconds. What is the unicorn's velocity at the end of this time?
A unicorn running on a beach at 8 m/s changes speed at a constant rate of 1.3 m/s2 over a period of 4 seconds. What distance did the unicorn travel during this process?
Homework Answers
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A speeding driver sees a police officer, hits her brakes, and
changes her speed from 45...
A speeding driver with a constant speed of 90.0 km/h passes a stopped police car. The...
A speeding driver with a constant speed of 90.0 km/h passes a stopped police car. The police car immediately takes off after him and accelerates with a constant acceleration of 5.0 m/s2. The time needed for the police car to overtake the speeding driver is closest to …
If the truck hits the deer 2.60 seconds after the driver slams on the brakes, what...
If the truck hits the deer 2.60 seconds after the driver slams
on the brakes, what was the speed of the truck, in km/h, when the
deer was struck? Assume motion was at constant acceleration. Answer
will be 3 sig figs.
(Homework Assignment 1 (Chapter 2) Problem C2-04 Constants A truck is traveling at a constant speed of 56.3 km/h Suddenly, the driver sees a deer 23.6 m away and slams on the brakes
A police officer with a radar gun clocks a speeding car as traveling 74 km/h along...
A police officer with a radar gun clocks a speeding car as traveling 74 km/h along a country lane. Assume that the police officer starts accelerating 5 seconds after the speeding car passes by and in order to catch up with the car. Assume the car travels at the same speed for 6 seconds, then slows down to 77 % of the original speed. What minimumacceleration will allow the officer to catch up with the car in 25 seconds? Express...
11.78 A car is traveling at a constant speed of 54 km/h when its driver sees...
11.78 A car is traveling at a constant speed of 54 km/h when its driver sees a child run into the road. The driver applies her brakes until the child returns to the sidewalk and then accelerates to resume her original speed of 54 km/h; the acceleration record of the car is shown in the figure. Assuming x = 0) when t = 0, determine (a) the time t, at which the velocity is again 54 km/h, (b) the position...
A driver in a moving car applies the brakes. The car slows to a final speed...
A driver in a moving car applies the brakes. The car slows to a final speed of 1.30 m/s over a distance of 40.0 m and a time interval of 8.20 s. The acceleration while braking is approximately constant. (a) What is the car's original speed before braking? What is its acceleration during this time? (The car's initial velocity is in the positive direction. Indicate the direction with the sign of your answer.)
Solve exactly if possible. Express all decimals to 4 significant figures. 1) 2) 3) 4) 5)...
Solve exactly if possible. Express all decimals to 4 significant figures. 1) 2) 3) 4) 5) 6) 7) What are Newton's Laws of motion? What is a "frame of reference"? What is a coordinate system? Express the point x-3, y-4 using polar coordinates. What is the SI unit for force? How is it defined using SI base units? What are the four fundamental forces in the universe? What is the approximate gravitational acceleration, g, near the Earth's surface? If this...
So I know there is 4 different equationsfor kinematics. Can you pick the problems that use...
So
I know there is 4 different equationsfor kinematics. Can you pick
the problems that use each one and write out how you do it?
Especially 6 and 10 because those seem very hard.
1-D Kinematics Practice PHYS&114 Name: 1. A car starting from rest travels 231 m with a constant acceleration of 1.05 3. What is its 2. How far does a train travel while its velocity changes from +102 to +45.0 등 in 22.0 seconds? 3. You sprint...
Please answer the following physic questions. Thank you! 1. A dog sees a flowerpot sail up...
Please answer the following physic questions. Thank you! 1. A dog sees a flowerpot sail up and then back past a window 5.0 ft high. If the total time the pot is in sight is 1.0 seconds, find the height above the window that the pot rises. 2. An elevator ascends with an upward acceleration of 4.0 ft/s2. At the instant its upward speed is 8.0 ft/s, a loose bolt drops from the ceiling of the elevator 9.0 ft from...
Problem number 8,14,&20. 11. A softball player hits the ball and starts running toward first 21....
Problem number 8,14,&20.
11. A softball player hits the ball and starts running toward first 21. I Which of the following moti base. Draw a motion diagram, using the particle model, show- ing her velocity vectors during the first few seconds of her run. diagram of Figure Q1.21? A. An ice skater gliding acros B. An airplane braking to a s C. A ear pulling away from a D. A pool ball bouncing off 12. A child is sledding on...
Sean is running a 100 m dash. When the starter's pistol fires, he leaves the starting...
Sean is running a 100 m dash. When the starter's pistol fires, he leaves the starting block and continues speeding up until 6 s into the race, when he reaches his top speed of 11 m/s. He holds this speed for 2 s; then his speed has slowed to 10 m/s by the time he crosses the finish line 11 s after he started the race 11) Chapter 2, Problem 6 Assume that Sean starts from rest and his motion...
If the truck hits the deer 2.60 seconds after the driver slams
on the brakes, what was the speed of the truck, in km/h, when the
deer was struck? Assume motion was at constant acceleration. Answer
will be 3 sig figs.
(Homework Assignment 1 (Chapter 2) Problem C2-04 Constants A truck is traveling at a constant speed of 56.3 km/h Suddenly, the driver sees a deer 23.6 m away and slams on the brakes
A police officer with a radar gun clocks a speeding car as traveling 74 km/h along a country lane. Assume that the police officer starts accelerating 5 seconds after the speeding car passes by and in order to catch up with the car. Assume the car travels at the same speed for 6 seconds, then slows down to 77 % of the original speed. What minimumacceleration will allow the officer to catch up with the car in 25 seconds? Express...
11.78 A car is traveling at a constant speed of 54 km/h when its driver sees a child run into the road. The driver applies her brakes until the child returns to the sidewalk and then accelerates to resume her original speed of 54 km/h; the acceleration record of the car is shown in the figure. Assuming x = 0) when t = 0, determine (a) the time t, at which the velocity is again 54 km/h, (b) the position...
Solve exactly if possible. Express all decimals to 4 significant figures. 1) 2) 3) 4) 5) 6) 7) What are Newton's Laws of motion? What is a "frame of reference"? What is a coordinate system? Express the point x-3, y-4 using polar coordinates. What is the SI unit for force? How is it defined using SI base units? What are the four fundamental forces in the universe? What is the approximate gravitational acceleration, g, near the Earth's surface? If this...
So
I know there is 4 different equationsfor kinematics. Can you pick
the problems that use each one and write out how you do it?
Especially 6 and 10 because those seem very hard.
1-D Kinematics Practice PHYS&114 Name: 1. A car starting from rest travels 231 m with a constant acceleration of 1.05 3. What is its 2. How far does a train travel while its velocity changes from +102 to +45.0 등 in 22.0 seconds? 3. You sprint...
Problem number 8,14,&20.
11. A softball player hits the ball and starts running toward first 21. I Which of the following moti base. Draw a motion diagram, using the particle model, show- ing her velocity vectors during the first few seconds of her run. diagram of Figure Q1.21? A. An ice skater gliding acros B. An airplane braking to a s C. A ear pulling away from a D. A pool ball bouncing off 12. A child is sledding on...
Sean is running a 100 m dash. When the starter's pistol fires, he leaves the starting block and continues speeding up until 6 s into the race, when he reaches his top speed of 11 m/s. He holds this speed for 2 s; then his speed has slowed to 10 m/s by the time he crosses the finish line 11 s after he started the race 11) Chapter 2, Problem 6 Assume that Sean starts from rest and his motion...
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