If you jumped from the same height into water as opposed to onto concrete, it would take the greater impulse in both cases to reduce your speed to zero velocity assuming you have same posture at impact in each case.

True or False

When you jump into the air and reach your peak jump height and for a split second in time the velocity of your center of gravity is 0 m/s, the acceleration of your center of gravity is 0 m/s

False or false

If the sum of the horizontal forces is negative on a runner who has a positive horizontal velocity, then which of the following is TRUE? The runner is speeding up, The runner has a constant velocity, The runner is slowing down, The runner has no acceleration

Springboard divers typically assume an extended body position prior to entry into the water in order to decrease:

a. Moment of inertia

b. Angular acceleration

c. Angular momentum

d. Angular velocity

Stability may be increased by widening the base of support at 90 degrees to the direction of an oncoming force?

is it true or false

which of the following best represents an objects resistance to angular acceleration

a)moment of inertia

b)RADIUS OF GYRATION

c)center of gravity

d)radius of rotation

e)mass

which of the following is a valid unit for angular velocity?

a)radians per second squared

b)meters per second

c)meters per second squared

d)degrees per second

e)degrees per second squared

An angle formed between the longitudinal axis of two adjacent body segments is defined as a:

acute angle

Segmental angle

Absolute angle

Relative angle (maybe)

A diver of mass 80 kg enters the water at a velocity of - 22 m/s. What is the impulse required from the water to slow the diver to zero velocity?

-2090 N

+2090 N

-1760

+1760 N (maybe)

Not enough information

A centrifugal force

has the sam direction as the centripetal force

causes one to be thrown into the side of the car during a sharp turn

Is a "center-fleeing" force

is an " center-seeking" force

when hitting a 300 yard drive. tiger woods swung his driver through 3.8 radians in 0.2s from the start of the swing to when he made impact with the ball. what was the average angular velocity of the club through the downswing?

a. not enouph info

b 15.7 rad/s

c 19.0 rad/s

d. 14.1 rad/s

e 1.6 rad/s

When a runner has completed one full lap around the inside lane of a 400 m Olympic standard running track the runner's displacement is 400 m. True False

A ball that was kicked in the horizontal direction with a velocity of -10 m/s (minus 10) rolls to a stop 6.67 seconds later. The ball's average horizontal acceleration was:

-1.5

-0.8 (maybe)

0.4

0.8

1.5

For a skater spinning with a constant angular velocity about the long axis with her arms out in a fully extended position, if elbow is one-half the distance from the axis of rotation as hand, the hand will have an angular velocity equal to ______ that of the elbow

The same as

Four times

One half

Twice

A skydiver of mass 100kg is falling against a resistive force the air equivalent to 981 N. At what rate is the divers velocity changing?

0 m/s

Need more info

-9.81 m/s

-6.13 m/s

+9.81 m/s (maybe)

-8.81 m/s

If a baseball (Ball A) is projected with a horizontal velocity of 100 mph and a vertical velocity of 5 mph from the same height that another ball (Ball B) is simply dropped vertically to the ground, which ball would hit the ground first assuming a perfectly horizontal field.

Ball B

Nelther. Both would hit at the same time.

Ball A

If the vertical ground reaction force is less than body weight, which way is the center of gravity moving

a. upwards

b. downwards

c. need more info.

What is the average velocity of a cyclist who covers 5.2 miles in 23 minutes?

15.2 mi/hr

14. 5 mi/hr

16.2 mi/hr

13.6 mi/hr

Usain bolt changes his running velocity from 6 m/s to 12 m/s in 0.5 secs. Andy cornwell changes his velocity from 3 m/s to 6 m/s in 0.2 sec. Which runner has the greatest acceleration?

usain

Same for both runners (maybe)

Need more info

Andy

For static equilibrium, what is the force F required from the biceps given the following: 1) the tendon inserts 2.0 cm from the elbow joint center and is at 90 degrees to the forearm; 2) the weight of the forearm is 80 N and can be considered to act at a distance of 25.0 cm from the elbow joint center.

800.0 N

708 .5 N

969 N

1000.0 N