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sleet_krkn [62]
3 years ago
15

Ms. Mayo challenged her students to build a pendulum that would hit a block of wood and make it travel the farthest distance. Th

e group that moved the block of wood the most would win a prize. One group's experimental data is shown above.
What is this group's independent variable?

A) height of bob drop


B) mass of pendulum bob


C) length of bob string


D) distance block moves
Physics
1 answer:
cestrela7 [59]3 years ago
4 0

Answer:

<u>B) mass of pendulum bob</u>

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A gazelle leaps from a cliff 2.5 m high with a speed of 5.6m/s.
jeyben [28]

Initial speed of Gazelle is along x direction and its value will be

v_x = 5.6 m/s

also its initial height is given as

y = 2.5 m

Part a)

now from kinematics along Y direction

\Delta y = v_y t + \frac{1}{2} at^2

as we know that

\Delta y = 0

v_y = 0

a = 9.8 m/s^2

2.5 = 0 + \frac{1}{2} (9.8) t^2

t = 0.714 s

Part b)

distance moved horizontally

\Delta x = v_x t

as we know that

v_x = 5.6 m/s

now we will have

v_x = 5.6 (0.714) = 4m

so it will lend at distance of 4 m.

Part c)

final velocity in vertical direction

v_{fy} = v_y + at

v_{fy} = 0 + (9.8)(0.714) = 7 m/s

v_x = 5.6 m/s

so net speed will be

v^2 = v_x^2 + v_y^2

v^2 = 7^2 + 5.6^2

v = 8.96 m/s


7 0
3 years ago
The elastic energy stored in your tendons can contribute up to 35 % of your energy needs when running. Sports scientists have st
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Answer:

Explanation:

From the given information:

The difference in the maximum energy stored is can be determined by finding the difference in the maximum stored energy in the sprinters and that of the non-athlete:

\Delta U = \dfrac{1}{2}k(x_2^2 - x_1^2)

\Delta U = \dfrac{1}{2} (32 \ N/mm) (\dfrac{1 \ mm}{10^{-3} \ m})  ((40\times 10^{-3})^2 - (32\times 10^{-3})^2)

\Delta U =16000 \times  (5.76\times 10^{-4})

\mathbf{\Delta U =9.216\ J}

8 0
3 years ago
The answer please to this and how it’s urgent
oksano4ka [1.4K]

Answer:

rA = 9 i + 9 j

rB = 12 i - 9 j

rB - rA = 3 i - 18 j

so distance in between them

= √[3×3 + 18 × 18 )

= √(9+324)

= √333

= 18.3 m

6 0
3 years ago
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