Answer:
False
Explanation:
Something with high specific heat cooling down would take longer to heat up.
Answer:
The speed increases by square root 2 times.
Explanation:
Let the wave velocity initially be 'v' with tension in the string as 'T' of mass 'm'.
Given:
Initial length of the string (L₁) = L
Final length of the string (L₂) = 2L
Wave velocity in a stretched string of length 'L' is given as:
From the above equation we can conclude that if tension 'T' and mass 'm' remains the same, the wave velocity is directly proportional to the square root of length of the stretched string. Therefore,
Now, plug in the given values and solve for v₂ in terms of v₁. This gives,
Therefore, the speed of the wave is increased by square root 2 times.
The sign associated with the average velocity of the object is negative.
<h3>
Average velocity of the object</h3>
The average velocity of the object is calculated as follows;
Average velocity = (v1 + v2)/2
v1 = -20/30 = -0.667 m/s
v2 = 20/50 = 0.4 m/s
Average velocity = (-0.667 + 0.4)/2
Average velocity = -0.134 m/s
Thus, the sign associated with the average velocity of the object is negative.
Learn more about average velocity here: brainly.com/question/6504879
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Answer:
The elastic potential energy PE=143.47kJ
Explanation:
This problem bothers on the potential energy stored in a material.
Given data
Mass of the bungee jumper
m= 75kg
Height of jump down the cliff h=195m
We know that the elastic potential energy stored is same as the potential energy of the bungee jumper
PE= 1/2kx²= mgh
Assuming g is 9.81m/s²
PE= 75*9.81*195
PE= 143471.25J
PE=143.47kJ
What is potential energy?
Potential energy is the energy possessed by a body by virtue of it position.