Hsc 216 Exam Questions And Answers
Center of gravity
In the average female, the center of gravity is located
-higher than in the average male
-near the sternum
-in the same place as the average male
-near the acetabulum
-lower than in the average male
Correct lower than in the average male
What is the action of the ankle during a squat?
A.
Flexion, Extension
B.
Plantarflexion, Dorsiflexion
C.
Inversion, Eversion
D.
The ankle does not move. All of the movement is due to movement at the knee and hip joints.
Plantarflexion and Dorsiflexion
The left fielder throws the baseball home from 60 m away. The ball's horizontal velocity is 30 m/s, and
its vertical velocity is sufficient to keep it in the air until it reaches the catcher at home plate. At the
same time, a base runner is running toward home plate. His velocity is 5 m/s, and he is 5 m from
home plate. If the base runner's velocity stays constant and air resistance isn't a factor, which will
arrive at home plate first, the base runner or the baseball?
A.
The base runner
B.
The ball
C.
They arrive at the same time
D.
Need more information to calculate
The base runner
Momentum
Units of momentum could be
,m/s
N
joules
N·m/s
kg·m/s
kg·m/s
A 55 kg diver leaves the diving board in a layout position with a moment of inertia of 400 kgm2 and
and angular velocity of 20 rad/s. What is her radius of gyration in this position?
5.0 meters
2.7 meters
3.7 meters
7.3 meters
2.7 meters
I = m*k 2
(I/m)^1/2 = k
(400/55)^1/2) = k
k= 2.7 meters
The form of energy associated with the stiffness and deformability of an object is called
gravitational potential energy
kinetic energy
strain energy
molecular energy
none of the above
strain energy
, Which of the following is not a vector quantity?
distance
speed
neither a nor b
both a and b
Correct both a and b
As the surface area of two objects in contact increases, what happens to the force of friction?
It increases.
It decreases.
It remains constant.
It disappears.
This depends on the weight of the object.
Correct It remains constant.
The coefficient of dynamic friction between the grass and a 200 kg football blocking sled is 0.20. If a
100 kg football player only pushes horizontally against the sled, how large must the horizontal force
be to keep the sled moving at constant velocity?
40 N
20 N
392 N
40 kg
589 N
Correct 392 N
The fundamental unit of the nervous system is the
brain
spinal cord
sensory and motor nerves
Center of gravity
In the average female, the center of gravity is located
-higher than in the average male
-near the sternum
-in the same place as the average male
-near the acetabulum
-lower than in the average male
Correct lower than in the average male
What is the action of the ankle during a squat?
A.
Flexion, Extension
B.
Plantarflexion, Dorsiflexion
C.
Inversion, Eversion
D.
The ankle does not move. All of the movement is due to movement at the knee and hip joints.
Plantarflexion and Dorsiflexion
The left fielder throws the baseball home from 60 m away. The ball's horizontal velocity is 30 m/s, and
its vertical velocity is sufficient to keep it in the air until it reaches the catcher at home plate. At the
same time, a base runner is running toward home plate. His velocity is 5 m/s, and he is 5 m from
home plate. If the base runner's velocity stays constant and air resistance isn't a factor, which will
arrive at home plate first, the base runner or the baseball?
A.
The base runner
B.
The ball
C.
They arrive at the same time
D.
Need more information to calculate
The base runner
Momentum
Units of momentum could be
,m/s
N
joules
N·m/s
kg·m/s
kg·m/s
A 55 kg diver leaves the diving board in a layout position with a moment of inertia of 400 kgm2 and
and angular velocity of 20 rad/s. What is her radius of gyration in this position?
5.0 meters
2.7 meters
3.7 meters
7.3 meters
2.7 meters
I = m*k 2
(I/m)^1/2 = k
(400/55)^1/2) = k
k= 2.7 meters
The form of energy associated with the stiffness and deformability of an object is called
gravitational potential energy
kinetic energy
strain energy
molecular energy
none of the above
strain energy
, Which of the following is not a vector quantity?
distance
speed
neither a nor b
both a and b
Correct both a and b
As the surface area of two objects in contact increases, what happens to the force of friction?
It increases.
It decreases.
It remains constant.
It disappears.
This depends on the weight of the object.
Correct It remains constant.
The coefficient of dynamic friction between the grass and a 200 kg football blocking sled is 0.20. If a
100 kg football player only pushes horizontally against the sled, how large must the horizontal force
be to keep the sled moving at constant velocity?
40 N
20 N
392 N
40 kg
589 N
Correct 392 N
The fundamental unit of the nervous system is the
brain
spinal cord
sensory and motor nerves
