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stepan [7]
3 years ago
8

Um corpo de massa 2,5kg é lançado verticalmente para cima. Se o sistema for considerado conservativo e no instante em que ele é

lançado sua energia mecânica vale 150 Joules, qual o valor para a energia mecânica no ponto de altura máxima que este corpo atinge, em joules. Considere g = 10m/s2?
Physics
1 answer:
kvv77 [185]3 years ago
7 0

Answer:

Energia mecânica = 300 Joules

Mechanical Energy = 300 Joules

Explanation:

given

m = 2.5kg

g=10m/s²

h=?

K.E = P.E

K.E = 150Joules

¹/₂mv² = m ×g ×h

150 J = 2.5 × 10 × h

h = 150/25

h= 6m

Mechanical energy = K.E + P.E

ME = 2 × 150 J

Mechanical Energy = 300Joules

dado

m = 2,5 kg

g = 10m / s²

h =?

K.E = P.E

K.E = 150Joules

¹ / ₂mv² = m × g × h

150 J = 2,5 × 10 × h

h = 150/25

h = 6m

Energia mecânica = K.E + P.E

ME = 2 × 150 J

Energia mecânica = 300Joules

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The acceleration due to gravity for any object, including 1 washer on the string, is always assumed to be m/s2. The mass of 3 wa
Pachacha [2.7K]

Answer:

The force will increase in proportion to the mass of the objects

Explanation:

The acceleration due to gravity is always the same. It is expressed in meters per second squared or m/s². The figure of 9.81 m/s² is an average value that was taken after calculating the acceleration under different surfaces. In fact, the acceleration differs depending on the shape of the part of the earth in relation to the earth's magnetic field and force.

Thus, if one washer was 20 kg, the acceleration being 9.81 m/s² the weight will be:

F = ma

  = 20 * 9.81\\= 196.2 N

If there are there washers, the weight will be:

F = 3 * 20 * 9.81

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5 0
3 years ago
Read 2 more answers
8. In the billiard ball room at the basement of Memorial Union, two identical balls are traveling toward each other along a stra
mel-nik [20]

Answer:

- Ball 1 will move backward at 7.89 m/s

- Ball 2 will move forward at 4.67 m/s

Explanation:

In an elastic collision, both the total momentum and the total kinetic energy of the system are conserved.

The conservation of the momentum can be written as:

m_1 u_1 + m_2 u_2 = m_1 v_1 + m_2 v_2

where

m_1 is the mass of ball 1

m_2 is the mass of ball 2

u_1 is the initial  velocity of ball 1

u_2 is the initial velocity of ball 2

v_1 is the final velocity of ball 1

v_2 is the final velocity of ball 2

The conservation of kinetic energy can be written as

\frac{1}{2}m_1 u_2^2 + \frac{1}{2}m_2 u_2^2 = \frac{1}{2}m_1 v_1^2 + \frac{1}{2}m_2 v_2^2

Working together the two equations, it is possible to find two expressions for the final velocities in terms of the initial velocities:

v_1=\frac{m_1 -m_2}{m_1 +m_2}u_1+\frac{2m_2}{m_1+m_2}u_2\\v_2=\frac{2m_1}{m_1+m_2}u_1 -\frac{m_1 -m_2}{m_1 +m_2}u_2

In this problem we have:

m_1 = m_2 = m since the mass of the two balls is identical

u_1=+4.67 m/s is the initial velocity of ball 1

u_2=-7.89 m/s is the initial velocity of ball 2

Substituting into the equations, we find the final velocities:

v_1=\frac{2m}{m+m}u_2=u_2 =-7.89 m/s\\v_2=\frac{2m}{m+m}u_1=u_1=+4.67 m/s

Therefore:

- Ball 1 will move backward at 7.89 m/s

- Ball 2 will move forward at 4.67 m/s

7 0
3 years ago
Wendy drives a minibus at a constant speed of 47 Kph. How far can Wendy travel in 3 hours?
garik1379 [7]

Answer:

wendy can travel 147 km in 3 hr if the speed is costant

5 0
3 years ago
Please help
lukranit [14]
A ray box is the answer I give
3 0
3 years ago
Explain how hydrogen is changed to helium during fusion.
nadya68 [22]

Answer:

The Sun and Nuclear Fusion. In the core of the Sun hydrogen is being converted into helium. This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom

Explanation:

hop it helps

7 0
3 years ago
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