BIO A Jet-Propelled Squid Squids can move through the water using a form of jet propulsion. Suppose a squid jets forward from rest with constant acceleration for 0.170 s, moving through a distance of 0.179 m. The squid then turns off its jets and coasts to rest with constant acceleration. The total time for this motion (from rest to rest) is 0.400 s, and the total distance covered is 0.421 m. What is the magnitude of the squid’s acceleration during (a) the time it is jetting and (b) the time it coasts to a stop?
BIO A Jet-Propelled Squid Squids can move through the water using a form of jet propulsion. Suppose a squid jets forward from rest with constant acceleration for 0.170 s, moving through a distance of 0.179 m. The squid then turns off its jets and coasts to rest with constant acceleration. The total time for this motion (from rest to rest) is 0.400 s, and the total distance covered is 0.421 m. What is the magnitude of the squid’s acceleration during (a) the time it is jetting and (b) the time it coasts to a stop?
BIO A Jet-Propelled Squid Squids can move through the water using a form of jet propulsion. Suppose a squid jets forward from rest with constant acceleration for 0.170 s, moving through a distance of 0.179 m. The squid then turns off its jets and coasts to rest with constant acceleration. The total time for this motion (from rest to rest) is 0.400 s, and the total distance covered is 0.421 m. What is the magnitude of the squid’s acceleration during (a) the time it is jetting and (b) the time it coasts to a stop?
On a one lane road, a person driving a car at v1 = 58 mi/h suddenly notices a truck 1.1 mi in front of him. That truck is moving in the same direction at v2 = 35 mi/h. In order to avoid a collision, the person has to reduce the speed of his car to v2 during time interval Δt. The smallest magnitude of acceleration required for the car to avoid a collision is a. During this problem, assume the direction of motion of the car is the positive direction.
1. Use the expressions you entered in parts (c) and (f) and enter an expression for a in terms of d, v1, and v2.
a = ( v2 - v1 )/Δt
Δt = ( 2 ) ( d )/( v1 - v2 )
2. Calculate the value of a in meters per second squared.
On a one lane road, a person driving a car at v1 = 54 mi/h suddenly notices a truck 0.65 mi in front of him. That truck is moving in the same direction at v2 = 35 mi/h. In order to avoid a collision, the person has to reduce the speed of his car tov2 during time interval Δt. The smallest magnitude of acceleration required for the car to avoid a collision is a. During this problem, assume the direction of motion of the car is the positive direction. Refer to the figure. Part (a) Enter an expression, in terms of defined quantities, for the distance, Δx2, traveled by the truck during the time interval Δt. Part (b) Enter an expression for the distance, Δx1, traveled by the car in terms of v1, v2 and a. Part (c) Enter an expression for the acceleration of the car, a, in terms of v1, v2, and Δt.
On a one lane road, a person driving a car at v1 = 54 mi/h suddenly notices a truck 0.65 mi in front of him. That truck is moving in the same direction at v2 = 35 mi/h. In order to avoid a collision, the person has to reduce the speed of his car tov2 during time interval Δt. The smallest magnitude of acceleration required for the car to avoid a collision is a. During this problem, assume the direction of motion of the car is the positive direction. Refer to the figure. The expression, in terms of defined quantities, for the distance, Δx2, traveled by the truck during the time interval Δt is deltax2= v2 times delta t. Part (b) Enter an expression for the distance, Δx1, traveled by the car in terms of v1, v2 and a. Part (c) Enter an expression for the acceleration of the car, a, in terms of v1, v2, and Δt. (d) enter an expression for delta x1 in terms of delta x2 and d when the drive just barely avoids collision.
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
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