The answers are as follows:
A.
False – Transformers are designed to work on AC
B.
True – This is to compensate the losses as the
length of wire increases
C.
Transformer – the transformer works in the
principle of electromagnetic induction
D.
Superconducting Magnet – magnet made from coils
of a superconducting wire
E.
Relay – This electrical switch is operated by a
magnet
Answer:
Vectors have a size and direction. Each of the existing vector quantity has a magnitude and a direction. Having direction along with the magnitude is the difference of a vector quantity from a scalar quantity. Vectors are indicates with arrows.
Answer:
9) This is a case of deceleration
10)-0.8 ms-2
b) acceleration is the change in velocity with time
11)
a) 100 ms-1
b) 100 seconds
12) 10ms-1
13) more information is needed to answer the question
14) - 0.4 ms^-2
15) 0.8 ms^-2
Explanation:
The deceleration is;
v-u/t
v= final velocity
u= initial velocity
t= time taken
20-60/50 =- 40/50= -0.8 ms-2
11)
Since it starts from rest, u=0 hence
v= u + at
v= 10 ×10
v= 100 ms-1
b)
v= u + at but u=0
1000 = 10 t
t= 1000/10
t= 100 seconds
12) since the sprinter must have started from rest, u= 0
v= u + at
v= 5 × 2
v= 10ms-1
14)
v- u/t
10 - 20/ 25
10/25
=- 0.4 ms^-2
15)
a=v-u/t
From rest, u=0
8 - 0/10
a= 8/10
a= 0.8 ms^-2
Its is solute. The dissolved substance. In salt water, salt is the solute and water is the solvent.
AB is the melting point of the substance. It takes time for the molecules to gain enough kinetic energy to change from solid to liquid state. BC is when the substance is in liquid form, the temperature gradually rises until it reaches it's boiling point
