1. An antelope moving with constant acceleration covers the distance between two points 90.0 m apart in 6.00s. Its speed as it passes the second point is 20.0 m/s. a) What is its speed at the first point? b) What is the acceleration?
2. The catapult of the aircraft carrier USS Abraham Lincoln accelerates an F/A – 18 Hornet jet fighter from rest to a take-off speed of 180 mi/h in a distance of 317 ft. Assume constant acceleration. a) Calculate the acceleration of the fighter in m/s2. b) Calculate the time required for the fighter to be accelerated to take-off speed.
3. An airplane travels 400m down the runway before taking off. If it starts from rest, moves with constant acceleration, and becomes airborne in 7.98 s, what is its speed in m/s, when takes off?
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Mathematical equation that gives the position and velocity of a moving object at any time. Given the mass of an object, the forces acting on it, and its initial position and velocity, an equation of motion is used to calculate its position and velocity at any later time. The equation must be based on Newton's laws of motion or, if speeds near that of light are involved, on the theory of relativity.
ReplyDeleteDisagree to Pamela Besa. Noting the nature of the questions, they are all purely based on kinematic equations. SO no need to use free-body diagrams and Newton's second law of motion especially that no masses are involved. Theory of relativity (I prefer it is Einstein's), is used to describe motions near or almost exceeding the speed of light, where Newtonian physics is not applicable.
ReplyDelete(I think those questions came from University Physics)
1.
Given
a = constant
d = 90.0 m
t = 6.0 sec
v2 = 20.0 m/s
a. Find v1.
Use 2d = v1*t + v2*t
and find v1
v1 = (2d - v2*t)/t
v1 = 10 m/s
b. acceleration
v2 - v1 = at
a = (v2 - v1)/t
a = 1.67 m/s^2
...
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