What requires more work from the brakes of a car, decreasing the velocity from 100 km/hr to 70 km/hr, or decreasing the velocity from 70 km/hr to 0 km/hr.?
What requires more work from the brakes of a car, decreasing the velocity from 100 km/hr...
1. A car is traveling at 36 km/hr and the driver puts on the brakes, bringing the car to rest in a time of 2s. What is the magnitude of the average acceleration of the car.
35. A car moving at 20 km/hr skids 10 m with locked brakes before coming to rest. How far will the car skid (on the same surface) if it is traveling at 80 km/hr?
A 2000 kg car is moving with a velocity of 50 km/hr. What is its kinetic energy? If the car reduces its speed by half, by what factor is the kinetic energy changed?
A car travels East at a constant velocity of 83 km/hr relative to the ground. A truck travels West at a constant velocity of 51 km/hr relative to the ground. What is the velocity of the truck relative to the car (enter the magnitude and direction separately)? Before you do any calculations, make sure that you draw a diagram that shows reference frames S and S'. Also, make sure that you label the velocities u, u', and v in your...
A. Consider a plane traveling with a velocity of 100 km/hr, South that encounters a side wind of 25 km/hr, West. Now what would the resulting velocity of the plane be? B. Suppose that a river is moving with a velocity of 3 m/s, North and a motorboat is moving with a velocity of 4 m/s, East. What would be the velocity of the motorboat?
5. The driver of a car travelling 75.0 km/hr suddenly sees road construction up ahead. She takes 2.30 s to begin applying the brakes. The car slows down at a constant rate of 10.0 km/br's for until she comes to a stop. a. Draw a picture showing the various intervals of the car's motion and accelerations, b. Calculate the average acceleration of the car after the driver applies the brake c. What is the total distance the car travelled from...
A truck traveling at 50 km/hr approaches a car stopped at a red light. When the truck is 100 m from the car, the light turns green and the car immediately begins to accelerate at 2 m/s2 to a final speed of 100 km/hr. A) • How long does it take for the car to reach its maximum speed? B)During this time, how far does the car travel? C)What is the distance between the truck and the car 20 seconds...
A car is traveling at 60.0 km/hr. The wheels on the car are rolling without slipping along level ground. The radius of each wheel is 0.5 m. What is the angular velocity, ω, of each wheel, since they are all the same size and are traveling at the same forward speed?
The velocity of the current in a river is C = 0.6i + 0.8j km/hr. A boat moves relative to the water with velocity v=7i km/hr. a. What is the speed of the boat relative to the riverbed? b. What angle does the velocity of the boat relative to the riverbed make with the vector v? c. What does the angle from part b tell us in practical terms?
Lecture 9 Problem (02/10) Due: 02/12 Name: A police car traveling at 75 km/hr is traveling east, chasing a motorist traveling at 60 km/hr. a. What is the velocity of the motorist relative to the police car? b. What is the velocity of the police car relative to the motorist? c. If they are originally 150 m apart, in what time interval wills the police car overtake the motorist?