Answer:
3 seconds
Explanation:
Height of the building = 400 feet
Height of the ball from the ground is given by
h=400−16t²
This formula has been derived from
a = Acceleration due to gravity = 32 ft/s²
u = Initial velocity = 0
t = Time taken
Substituting all the values we get
This is the height of the ball from the top of the building
The height of the ball from the ground will be
h = 400-s
⇒h = 400−16t²
When h = 256 ft
Time taken by the ball to reach a height of 256 feet above the ground is 3 seconds
Answer:
A = m³/s³ = [L]³/[T]³ = [L³T⁻³]
B = m³s = [L³T]
Explanation:
We have the equation:
V = At³ + B/t
where, the dimensions of each variable are as follows:
V = m³ = [L]³
t = s = [T]
substituting these in equation, we get:
m³ = A(s)³ + B/s
for the homogeneity of the equation:
A(s)³ = m³
<u>A = m³/s³ = [L]³/[T]³ = [L³T⁻³]</u>
Also,
B/s = m³
<u>B = m³s = [L³T]</u>
Answer:
it is possible to fit the shapes of all the continents onto one, so for example places in the continent of Africa fit into south america.
hope this helps, i hope this made sense.
Answer:
strain = 0.0011575
Explanation:
Given:
- The diameter of specimen d = 0.02 m
- Applied uni-axial force P = 40,000 N
- Modulus of Elasticity E = 110 GPa
Find:
If the deformation is totally elastic, what is the strain experienced by the specimen?
Solution:
- First we need to calculate the stress in the specimen using the relation:
stress = Force / Area
stress = 40,000*4 / pi*d^2
stress = 160,000 / pi*0.02^2
stress = 127.323 MPa
- Now compute Elastic strain from the definition of Elastic modulus of a material:
E = stress / strain
strain = stress / E
- Plug in the values:
strain = 127.323 / 110*10^3
strain = 0.0011575
Answer:
An electroscope is a device which used to detect charge on an object. It consists of conducting sphere at top with a metal rod and metal leaves. This is enclosed in a glass jar. A charged object is brought near the top of the electroscope. this causes electrons to transfer to or from the charged object.
If the electroscope has charge, the leaves repel each other and move away from each other. This is because charge conducts from the metallic sphere through rod to both leaves. Having same charge, the leaves repel each other and open up. No change occurs in neutral state.
We cannot tell from an electroscope alone what kind of charge it has because the leaves have like charges and hence repel each other whether it is positive or negative charge. Thus, we cannot differentiate the charge.