3) Applying regression on data involves adopting a that best describes the linea
ID: 1289909 • Letter: 3
Question
3) Applying regression on data involves adopting a that best describes the linear relationship between two variables A) curve fit B)GLX fit C) exel fit D) linear fit 4) What does the slope of a velocity-time graph represent? 4) A) Slope (m) B) Acceleration C) Speed D) Time 5) The sensor interprets motion toward it as negative and motion away from n as positive. 5) A) True B) False 6) 6) The newton is a unit of A) density. B) inertia. C) force. D)mass . 7) If an object's mass is increasing while a constant force is applied to the object, the 7 acceleration A) decreases. B) remains the same. C) increases. 8) When a falling object has reached its terminal velocity, its acceleration is A) constant. B) g. C) zero. 9) Two objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the A) lighter object. B) heavier object. C) Both hit at the same time. D) not enough information 10) When an object falls in air, the air exerts an upward air resistance force sometimes called a force. A) weight B) Free-fall C) newton's D) dragExplanation / Answer
3.
The linear fit is useful to determine the relation between two variables.
Answer: option (D)
4.
The slope of the velocity - time graph represents the acceelration of the object.
The rate of change of velocity is the acceleration.
Answer: option (B)
5.
The displacement has both magnitude and direction. So, the given statement is true.
Answer: option (A)
6.
From the newton's law, the force on the object is,
F = ma
= (kg)(m/s2)
= kg.m/s2 [1 N/ kg.m/s2]
= N
The unit of force is Newton.
Answer: option (C)
7.
From the Newton's second law, the mass of the object is inversely proportional to the acceleration when the force remains constant.
a = F/m
The acceleration of the object decreases with increasing of its mass.
Answer: option (A)
8.
The object moves with constant velocity when it reaches its terminal velocity.
The rate of change of velocity is the acceleration of the object. So, the rate of
change of velocity becomes zero when the object reached its terminal velocity.
In other words, the acceleration of the object is zero when it reaches its terminal
velocity.
Answer: Option (C)
9.
In free falling, the heavier object hit the ground first compared with lighter object in the presence of air resistance.
Answer: Option (B)
10.
The upward air resistance force exerted on the reely falling body is called as a drag force.
Answer: Option (D)
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