A) Metal
B) Non-metal
C) Non-metal
D) Metal
Answer:
a) 2.3 m/s^2
b) 33.3 s
c) 803 m
d) 0 m/s
Explanation:
We need to apply the accelerated motion formulas.
The acceleration is given by:
we need to calculate the time the cheetah takes to stop when it starts to decelerate:
We need to calculate the displacement for all of the stages:
stage 1:
stage 2:
stage 3:
The total displacement is given by:
the final velocity of the cheetah is zero because the cheetah decelerates until stop.
the answer is a because they start on the north side
Explanation:
Given that, Speed of the automobile, v = 55 km/h = 15.27 m/s
Diameter of the tire, d = 77 cm
Radius, r = 0.385 m
(a) Let is the angular speed of the tires about their axles.
The relation between the linear speed and the angular speed is given by :
(b) Number of revolution,
Final angular speed of the car,
Initial angular speed,
Let is the angular acceleration of the car. Using third equation of rotational kinematics as :
(c) Let d is the distance covered by the car during the braking. It is given by :
d = 91.92 meters