Answer:
See the answer below
Explanation:
a. The volume in the first measuring cylinder reads 70 while that of the second reads 95
. Hence;
V1 = 70
V2 = 95
b. <u>An object will always displace its own volume in a liquid</u>. Hence:
Volume V of the rock sample = V2 - V1
= 95 - 70 = 25
c. Mass of A = 102 g
Volume of A = 25
<em>Density = mass/volume</em>
Hence, density of A = 102/25 = 4.08 g/
Answer:
The two possible thicknesses of the soap bubble is 129 nm and 389 nm.
Explanation:
Given that,
Wavelength = 690 nm
Refractive index = 1.33
We need to calculate the two possible thicknesses of the soap bubble
Using formula of thickness
For m = 0,
Put the value into the formula
For m=1,
Put the value into the formula
Hence, The two possible thicknesses of the soap bubble is 129 nm and 389 nm.
The forces a piano tuner applies to stretch the steel piano wire willl be 1.4 × 10¹¹ N.
<h3>What is force?</h3>Force is defined as the push or pulls applied to the body. Sometimes it is used to change the shape, size, and direction of the body. Force is defined as the product of mass and acceleration. Its unit is Newton.
The application of a force may be used to describe the steel as an elastic element within a certain range of applied force.
Given data;
Young modulus, E=2.10 × 10¹¹ N/m²
Cross-sectional area,A
Final length,
Initial length,
Hence, the force a piano tuner applies to stretch the steel piano wire willl be 1.4 × 10¹¹ N.
To learn more about the force refer to the link;
#SPJ1
Answer:
The orbital speed of Dactyl is
Explanation:
The orbital speed can be determined by the combination of the universal law of gravity and Newton's second law:
(1)
Where G is gravitational constant, M is the mass of the asteroid, m is the mass of the moon and r is the distance between them
In the other hand, Newton's second law can be defined as:
(2)
Where m is the mass and a is the acceleration
Then, equation 2 can be replaced in equation 1
(2)
However, a will be the centripetal acceleration since the moon Dactyl describe a circular motion around the asteroid
(3)
(4)
Therefore, v can be isolated from equation 4:
(5)
Finally, the orbital speed can be found from equation 5:
Notice, that it is necessary to express r in units of meters.
⇒
Hence, the orbital speed of Dactyl is