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labwork [276]
3 years ago
15

A piano of mass 852 kg is lifted to a height of 3.5 m. How much gravitational potential energy is added to the piano? Accelerati

on due to gravity is g = 9.8 m/s2 O A. 102,282 J O B. 29,224J O C. 2982 J O D. 304.3J SUSM​
Physics
1 answer:
slega [8]3 years ago
6 0

Answer:

29223.6J

Explanation:

Given parameters:

Mass of Piano = 852kg

Height of lifting  = 3.5m

Unknown:

Gravitational potential energy  = ?

Solution:

The gravitational potential energy of a body can be expressed as the energy due to the position of a body;

  G.P.E  = mgh

m is the mass

g is the acceleration due to gravity

h is the height

 Now insert the given parameters and solve;

   G.P.E  = 852 x 9.8 x 3.5 = 29223.6J

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A model rocket blasts off and moves upward with an acceleration of 12 m/s2 until it reaches a height of 26 m. at that height, it
Diano4ka-milaya [45]

initial acceleration of rocket is given as

a = 12 m/s^2

h = 26 m

now we can use kinematics to find its speed

v_f^2 - v_i^2 = 2 a h

v_f^2 - 0 = 2 * 12*26

v_f = 24.98 m/s

now after this it will be under free fall

so now again using kinematics

v_f = 0

at maximum height

v_f^2 - v_i^2 = 2 a s

0 - 24.98^2 = 2 * (-9.8)* h

h = 31.8 m

total height from the ground = 31.8 + 26 = 57.8 m

Part b)

now after reaching highest height it will fall to ground

So in order to find the speed we can use kinematics again

v_f^2 - v_i^2 = 2 a d

v_f^2 - 0 = 2*9.8*57.8

v_f = 33.67 m/s

Part c)

first rocket accelerate to reach height 26 meter and speed becomes 24.98 m/s

now we have

v_f - v_i = a t

24.98 - 0 = 12*t_1

t_1 = 2.1 s

after this it will reach to highest point and final speed becomes zero

v_f - v_i = at

0 - 24.98 = -9.8 * t

t_2 = 2.55 s

now from this it will fall back to ground and reach to final speed 33.67 m/s

now we have

v_f - v_i = at

33.67 - 0 = 9.8 * t

t_3 = 3.44 s

so total time is given as

<em>t = 3.44 + 2.55 + 2.1 = 8.1 s</em>

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They decompose and leave their nutrients in the earth. 
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A number of energy transformations occur when water that is stored behind a dam is changed into electrical energy. For each step
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An unknown galaxy has a large flattened core. Which of the following classifications would best fit this galaxy's description?

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3 years ago
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liubo4ka [24]

Answer:

-9.4 kg m/s

Explanation:

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Δp = p − p₀

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Δp = -9.4 kg m/s

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A hummingbird needs 10 grams of sugar and 8 grams of protein each day. one honeysuckle flower provides 20 mg of sugar and 10 mg
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If a hummingbirds diet is composed mainly of honeysuckle nectar, it would require 10g/0.020g * 15 seconds for sugar = 2.08 hours = 124.8 minutes

8g/0.010g * 15 for protein = 3.3 hours = 216 minutes

 

If a hummingbirds diet is composed mainly of nasturtium nectar, it would require 10g/0.010g * 20 seconds for sugar = 5.5 hours = 330 minutes

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4 years ago
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