In a parachute, falling steadily at 7.5m/s, how long does it take to reach the ground from 3,000 m high?

A bicycle traveled 150 meters west from point A to point B. Then it took the same route and came back to point A. It took a tota

Dennis_Churaev [7]

Answer

D. The average speed is 2.5 meters/second, and the average velocity is 0 meters/second.

The difference between speed and velocity is that, speed is a scalar quantity while velocity is a vector quantity.

Average speed = total distance/Total time

= (150 + 150) / (2×60)

= 300/120

= 2.5 m/s

Average velocity = Total displacement/ Total time

= (150 + -150) / (2 × 60)

= 0/120

= 0 m/s

6 0

3 years ago

When one form of energy is converted into another what is the name of that

Svetradugi [14.3K]

Transformation of energy, because energy cannot be created or destroyed

8 0

3 years ago

Katelyn (55 kg) is practicing a drop jump in the biomechanics lab. She steps off a plyometrics box, lands on the force plate, an

suter [353]

Answer:

J = 357.5 kg*m/s

Explanation:

The impulse exerted on Katelyn when she was on the force plate, is equal to the change in her momentum, according to Newton's 2nd Law.
Assuming as the positive direction the upward direction (coincident with the positive y-axis) we can express the initial momentum as follows:

$p_{o} = m*v_{o} = 55 kg * (-3.0 m/s) (1)$

By the same token, the final momentum is as follows:

$p_{f} = m*v_{f} = 55 kg * (3.5 m/s) (2)$

As we have already said, the impulse J is just equal to the change in momentum, i.e., the difference between (2) and (1):

$J = p_{f} - p_{o} = m* (v_{f} -v_{o}) = 55 kg* (3.5m/s- (-3.0m/s)) = 357.5 kg*m/s (3)$

5 0

3 years ago

A physics demo launches a ball horizontally while dropping a second ball vertically at exactly the same time. 1) which ball hits

Simora [160]

Answer:

Both balls will hit the ground at the same time

Explanation:

The factor which leads to ball falling is the gravity acting on the ball;

The motions along the path of both balls are independent and both balls will obey the following illustration

Using the third equation of motion

s = ut + ½at²

Where s = distance covered by both balls.

u = initial velocity of both balls. Since both balls start from rest, u = 0m/s

a = acceleration; and it's equal to acceleration due to gravity.

a = g

By substituton

s = 0 * t + ½gt²

s = 0 + ½gt²

s = ½gt²

Make t the subject of formula

gt² = 2s

t² = 2s/g

t = ±√(2s/g)

But time can't be less than 0 (in other words, negative)

So,

t = √(2s/g)

It'll take both balls √(2s/g) time to hit the floor

6 0

3 years ago

Read 2 more answers

A runner starts at point A runs around a 1 mile track and finishes the run back at point A. Which of the following statement is

Zanzabum

The runner's displacement and average velocity are both zero. (I hope this answer is on the list of choices that you neglected to share.)

4 0

3 years ago