Answer: 
Explanation:
Centripetal acceleration
is calculated by the following equation:
Where:
is the Earth's orbital speed
is the orbital radius

Answer:
C is the right answer.
Body massager uses electrical energy to move back and forth. In this sense, a motor is being used for the operation
Answer:
D. sweeper
Explanation:
i did the assignment and got it right
A) Equivalent resistance increases
b) Current through entire circuit decreases
c) Current through the two ( 55 and 75 resistors remains the same), current through 45-resistor is 0.2A
Answer:
The force on the test charge is 114.75 N.
Explanation:
Given that,
Test charge 
Suppose the test charge is 3.4 μC and the distance between the charge and test charge is 4.0 cm.
We need to calculate the force on the test charge
Using formula of electric force

Where, q = test charge
q₁ =charge
r = distance
Put the value into the formula

Hence, The force on the test charge is 114.75 N.