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2 years ago

Which of the following has the greatest inertia?

Physics

1 answer:

mixas84 [53]2 years ago

8 0

Answer:

the jet i just took the test

and got 100

Explanation:

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In the vertical jump, an athlete starts from a crouch and jumps upward as high as possible. Even the best athletes spend little

horrorfan [7]

Answer:

t_up / t_down = 6.83

Explanation:

Find:

Calculate the ratio of the time he is above y_max/2 to the time it takes him to go from the floor to that height.

Solution:

- Compute the velocity v_o at y_max:

v_i^2 = v_f^2 - 2*g*y_max

0 = v_o^2 - 2*g*y_max

v_o = sqrt (2*g*y_max)

- The total time spend by athlete above height y_max / 2 is:

y - y_o = v_o*t_up - 0.5*g*t^2_up

v_o = 0.5*g*t_up

- Equate two equations:

sqrt (2*g*y_max) = 0.5*g*t_up

t_up = 2*sqrt(2*g*y_max) / g

- The total time taken by athlete to reach height y_max / 2 from ground is:

y - y_o = v_o*t_down - 0.5*g*t^2_down

g*t_^2down - 2*v_o*t_down + y_max = 0

- Solve the quadratic and evaluate t_down:

t_down = (v_o +/- sqrt (v^2_o - g*y_max)) / g

Substitute for v_o = sqrt (2*g*y_max)

t_down = (sqrt(2g*y_max) +/- sqrt(g*y_max)) / g

- We will use the minus quantity, because we need the first part of the journey from ground from the two times he passes the height of y_max/2.

Hence,

t_down = (sqrt(2g*y_max) - sqrt(g*y_max)) / g

t_down = (sqrt(g*y_max) / g) * (sqrt(2) - 1)

- Compute the ratio t_up to t_down:

t_up / t_down = 2*sqrt(2*g*y_max) / g * g / (sqrt(g*y_max)*(sqrt(2) - 1)

= 2*sqrt(2) / (sqrt(2) - 1)

= 6.83

8 0

2 years ago

During a softball game, a batter hits a ball upward from an initial height of 3 feet. the height, in feet, of the softball is gi

Lynna [10]

Answer: 3.55 s and 0.83 s

Explanation:

The height (in feet) of the softball is given by:

s(t)=-16t²+70t+3

we need to find the time when the ball is 50 feet above the ground:

⇒50 = -16t²+70t+3

we need to solve the quadratic equation

⇒16t²-70t+47 = 0

$t=\frac{70\pm \sqrt{70^2-4(16)(47)}}{2(16)}$

This gives two values of time: 3.55 s and 0.83 s

6 0

2 years ago

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A truck moving at 20 mph shoots a soccer ball at 20 mph in the opposite direction. How fast is the soccer ball moving? Explain

Brrunno [24]

Answer:

Speed of the soccer ball with respect to ground is ZERO

Explanation:

As we know that truck is moving with speed 20 mph

Now a soccer ball is shoot from truck with respect to the motion of truck in opposite direction

The relative speed of the soccer ball is

$v_{bt} = 20 mph$

now we know that

$v_{bt} = v_b - v_t$

so we have

$-20 mph = v_b - 20$

so we have

$v_b = 0$

6 0

3 years ago

The rock has potential energy due to the gravitational potential with the Earth. As the rock is falling, this gravitational ener

Delicious77 [7]

Answer:

Explanation:

while it is still falling it is turned into kinetic energy. While on the floor it turns onto potential energy. Remember energy cannot be created or the destroyed so the other ones are automatically out.

5 0

2 years ago

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How is an electromagnet different from a bar magnet?

Rus_ich [418]

The answer is c) an electromagnet is temporary

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2 years ago

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